GNU bug report logs - #78561
[PATCH] Add semantic linefeed support for paragraph filling

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Package: emacs; Reported by: Roi Martin <jroi.martin@HIDDEN>; Keywords: patch; Done: Eli Zaretskii <eliz@HIDDEN>; Maintainer for emacs is bug-gnu-emacs@HIDDEN.

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From: Ihor Radchenko <yantar92@HIDDEN>
To: Juri Linkov <juri@HIDDEN>
Subject: Re: bug#78561: [PATCH] Add semantic linefeed support for paragraph
 filling
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Juri Linkov <juri@HIDDEN> writes:

>>>   ;; Revert 'M-q' hijacked by org-mode:
>>>   (define-key org-mode-map (vector 'remap 'fill-paragraph) nil)
>>
>> Maybe it deserves a bug report?  Looking at the code, I can't see a good
>> reason for this hijacking.  Maybe it's just a left over from old code.
>
> Cc-ing Ihor for the definite answer, but I suppose 'org-fill-paragraph'
> still exists because it needs the argument 'region', whereas 'fill-paragraph'
> calls 'fill-paragraph-function' only with 'justify', not 'region'.

Yes. More specifically, when region is active, `fill-paragraph'
completely ignores `fill-paragraph-function' and directly calls
`fill-region' -> `fill-region-as-paragraph'. This behavior cannot be
customized by major modes, so Org has to override the whole
`fill-paragraph' to perform syntax-aware filling.

-- 
Ihor Radchenko // yantar92,
Org mode maintainer,
Learn more about Org mode at <https://orgmode.org/>.
Support Org development at <https://liberapay.com/org-mode>,
or support my work at <https://liberapay.com/yantar92>

Information forwarded to bug-gnu-emacs@HIDDEN:
bug#78561; Package emacs. Full text available.

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From: Roi Martin <jroi.martin@HIDDEN>
To: Juri Linkov <juri@HIDDEN>, Stefan Monnier <monnier@HIDDEN>
Subject: Re: bug#78561: [PATCH] Add semantic linefeed support for paragraph
 filling
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Roi Martin <jroi.martin@HIDDEN> writes:

> Stefan, I'll send a new patch to support this.  I'll also modify
> `fill-paragraph-semlf' to respect the `fill-paragraph-function' protocol
> (i.e. return t).

I've created Bug#78816.

     Roi

Information forwarded to bug-gnu-emacs@HIDDEN:
bug#78561; Package emacs. Full text available.

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From: Roi Martin <jroi.martin@HIDDEN>
To: Juri Linkov <juri@HIDDEN>, Stefan Monnier <monnier@HIDDEN>
Subject: Re: bug#78561: [PATCH] Add semantic linefeed support for paragraph
 filling
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Juri Linkov <juri@HIDDEN> writes:

>> I expect it would make more sense to introduce
>> a `fill-region-as-paragraph-function`, so `fill-region` will DTRT after
>> you set that var to `fill-region-as-paragraph-semlf`.  Instead of having
>> to reinvent/duplicate the code of `fill-region` in a new
>> `fill-region-semlf`.
>
> AFAIS, they have a significant difference: `fill-region-as-paragraph`
> merges all selected paragraphs into one paragraph, but `fill-region`
> formats each paragraph separately, keeping separators (empty lines)
> between them.

If I'm not wrong, `fill-region' calls `fill-region-as-paragraph'
internally,

  (defun fill-region (from to &optional justify nosqueeze to-eop)
    ;; ...
  	    (setq fill-pfx
  		  (fill-region-as-paragraph (point) end justify nosqueeze))
    ;; ...
      fill-pfx))

And `fill-paragraph' calls `fill-region' if Transient Mark mode is
enabled and the mark is active.

So, the idea is to define a new variable
`fill-region-as-paragraph-function' so `fill-region' uses this variable
instead of calling `fill-region-as-paragraph' directly.

Stefan, I'll send a new patch to support this.  I'll also modify
`fill-paragraph-semlf' to respect the `fill-paragraph-function' protocol
(i.e. return t).

        Roi

Information forwarded to bug-gnu-emacs@HIDDEN:
bug#78561; Package emacs. Full text available.

Message received at 78561 <at> debbugs.gnu.org:

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From: Juri Linkov <juri@HIDDEN>
To: Stefan Monnier <monnier@HIDDEN>
Subject: Re: bug#78561: [PATCH] Add semantic linefeed support for paragraph
 filling
In-Reply-To: <jwvfrfz8js5.fsf-monnier+emacs@HIDDEN>
Organization: LINKOV.NET
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>>   ;; Revert 'M-q' hijacked by org-mode:
>>   (define-key org-mode-map (vector 'remap 'fill-paragraph) nil)
>
> Maybe it deserves a bug report?  Looking at the code, I can't see a good
> reason for this hijacking.  Maybe it's just a left over from old code.

Cc-ing Ihor for the definite answer, but I suppose 'org-fill-paragraph'
still exists because it needs the argument 'region', whereas 'fill-paragraph'
calls 'fill-paragraph-function' only with 'justify', not 'region'.

>>> `fill-region-as-paragraph-semlf' is analogous to
>>> `fill-region-as-paragraph', so it removes any paragraph breaks in the
>>> region and extra newlines at the end, and fills lines within the region.
>>
>> Then maybe we need another function `fill-region-semlf'.
>
> I expect it would make more sense to introduce
> a `fill-region-as-paragraph-function`, so `fill-region` will DTRT after
> you set that var to `fill-region-as-paragraph-semlf`.  Instead of having
> to reinvent/duplicate the code of `fill-region` in a new
> `fill-region-semlf`.

AFAIS, they have a significant difference: `fill-region-as-paragraph`
merges all selected paragraphs into one paragraph, but `fill-region`
formats each paragraph separately, keeping separators (empty lines)
between them.

Information forwarded to bug-gnu-emacs@HIDDEN:
bug#78561; Package emacs. Full text available.

Message received at 78561 <at> debbugs.gnu.org:

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From: Stefan Monnier <monnier@HIDDEN>
To: Juri Linkov <juri@HIDDEN>
Subject: Re: bug#78561: [PATCH] Add semantic linefeed support for paragraph
 filling
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>   ;; Revert 'M-q' hijacked by org-mode:
>   (define-key org-mode-map (vector 'remap 'fill-paragraph) nil)

Maybe it deserves a bug report?  Looking at the code, I can't see a good
reason for this hijacking.  Maybe it's just a left over from old code.

>> `fill-region-as-paragraph-semlf' is analogous to
>> `fill-region-as-paragraph', so it removes any paragraph breaks in the
>> region and extra newlines at the end, and fills lines within the region.
>
> Then maybe we need another function `fill-region-semlf'.

I expect it would make more sense to introduce
a `fill-region-as-paragraph-function`, so `fill-region` will DTRT after
you set that var to `fill-region-as-paragraph-semlf`.  Instead of having
to reinvent/duplicate the code of `fill-region` in a new
`fill-region-semlf`.


        Stefan

Information forwarded to bug-gnu-emacs@HIDDEN:
bug#78561; Package emacs. Full text available.

Message received at 78561 <at> debbugs.gnu.org:

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From: Juri Linkov <juri@HIDDEN>
To: Roi Martin <jroi.martin@HIDDEN>
Subject: Re: bug#78561: [PATCH] Add semantic linefeed support for paragraph
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>> I tried to add to .dir-locals.el:
>>
>>   ((org-mode . ((fill-paragraph-function . fill-paragraph-semlf))))
>>
>> and it works nicely.
>
> That's interesting.  If I create an org-mode buffer and set
> `fill-paragraph-function' with:
>
>   (setq-local fill-paragraph-function #'fill-paragraph-semlf)
>
> Invoking `org-fill-paragraph' (bound to 'M-q') does not fill the
> paragraph using semantic linefeeds.  However, `fill-paragraph' does.
>
> I'll have to dig more into it.

Sorry, I added the following line to my config long ago,
and forgot about it:

  ;; Revert 'M-q' hijacked by org-mode:
  (define-key org-mode-map (vector 'remap 'fill-paragraph) nil)

>> With one exception that it fails on the active region.
>>
>> But we could add a new variable, e.g. 'fill-region-function'
>> that will be possible to customize to 'fill-region-as-paragraph-semlf'.
>
> Check these sub-threads,
>
> https://lists.gnu.org/archive/html/bug-gnu-emacs/2025-05/msg01088.html
> https://lists.gnu.org/archive/html/bug-gnu-emacs/2025-06/msg00920.html
>
> Maybe it is time to move the discussion to emacs-devel?

Probably better to create a new feature request on bug-gnu-emacs.

>> Although it's strange that 'fill-region-as-paragraph-semlf'
>> doesn't keep empty lines between paragraphs like 'fill-region' does.
>
> `fill-region-as-paragraph-semlf' is analogous to
> `fill-region-as-paragraph', so it removes any paragraph breaks in the
> region and extra newlines at the end, and fills lines within the region.

Then maybe we need another function `fill-region-semlf'.
I see that you already mentioned it earlier.

Another variant is to add a new argument `region' to `fill-paragraph-semlf'.
But the problem is that `fill-paragraph' doesn't forward its argument 
`region' to `fill-paragraph-function', i.e. there is

  (funcall function justify)

instead of

  (funcall function justify region)

Information forwarded to bug-gnu-emacs@HIDDEN:
bug#78561; Package emacs. Full text available.

Message received at submit <at> debbugs.gnu.org:

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Subject: Re: bug#78561: [PATCH] Add semantic linefeed support for paragraph
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Roi Martin <jroi.martin@HIDDEN> writes:

> Eli Zaretskii <eliz@HIDDEN> writes:
>
>> As for other modes, what modes could usefully make use of this kind of
>> region-filling?  Org mode might be the only one, but in that case it's
>> something for Org developers to chime in; I added Ihor to the
>> discussion.
>
> I would include all those languages that are not sensitive to newlines
> when exported to a different format.  For instance, Org, Texinfo, LaTeX
> or Markdown.

Note that in Markdown, two space characters (#x20) at the end of a line
denote a line break, so such lines should not be filled.  (I did not
check whether the code already considers this; apologies for the
superfluous message if it does.)

Information forwarded to bug-gnu-emacs@HIDDEN:
bug#78561; Package emacs. Full text available.

Message received at 78561 <at> debbugs.gnu.org:

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From: Roi Martin <jroi.martin@HIDDEN>
To: Eli Zaretskii <eliz@HIDDEN>, Ihor Radchenko <yantar92@HIDDEN>
Subject: Re: bug#78561: [PATCH] Add semantic linefeed support for paragraph
 filling
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Eli Zaretskii <eliz@HIDDEN> writes:

> As for other modes, what modes could usefully make use of this kind of
> region-filling?  Org mode might be the only one, but in that case it's
> something for Org developers to chime in; I added Ihor to the
> discussion.

I would include all those languages that are not sensitive to newlines
when exported to a different format.  For instance, Org, Texinfo, LaTeX
or Markdown.  Of course, there might be people that find this kind of
formatting useful when writing text in text-mode or outline-mode.

>> I guess the safest call for now is to provide `fill-paragraph-semlf' and
>> `fill-region-as-paragraph-semlf' as commands that users or major modes
>> can call directly.
>
> That's what we currently do, right?

Yes.  But, if we decide to keep it like that, we need to remove the
reference to `fill-paragraph-function' from the doc string of
`fill-paragraph-semlf'.  Once we take a decission, I'll send a new
patch.

        Roi

Information forwarded to bug-gnu-emacs@HIDDEN:
bug#78561; Package emacs. Full text available.

Message received at 78561 <at> debbugs.gnu.org:

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To: Roi Martin <jroi.martin@HIDDEN>,
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In-Reply-To: <871prkyovd.fsf@HIDDEN> (message from Roi Martin on Mon, 16
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Subject: Re: bug#78561: [PATCH] Add semantic linefeed support for paragraph
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> From: Roi Martin <jroi.martin@HIDDEN>
> Cc: juri@HIDDEN, 78561 <at> debbugs.gnu.org
> Date: Mon, 16 Jun 2025 12:14:46 +0200
> 
> Eli Zaretskii <eliz@HIDDEN> writes:
> 
> >> Then, what's better?  Should we remove the following paragraph from the
> >> doc string of `fill-paragraph-semlf'?
> >> 
> >>   You can use this function as the value of ‘fill-paragraph-function’, so
> >>   ‘fill-paragraph’ and other filling commands will use it.
> >> 
> >> Or should we return t in `fill-paragraph-semlf'?
> >
> > I don't know.  Is returning fill-prefix useful in some important cases?
> 
> That's hard to say until we decide how to "wire" the semantic-linefeed
> functions with the generic functions already provided by fill.el.  For
> instance, coming back to some of the comments done by Stefan,
> 
> - How do we fill the paragraphs within the active region?  Should we add
>   a new `fill-region-function' variable and provide a
>   `fill-region-semlf' function?  Should we have a way to tell fill.el to
>   use a custom `fill-region-as-paragraph' function?
> - How do we change how major modes fill a paragraph or a region?  For
>   instance, in the case of org-mode, how do we combine org-mode's
>   fill-paragraph logic with semantic linefeeds?  Should the major mode
>   be in charge of providing this feature leveraging the existing
>   semantic-linefeed functions?  Should the user change a set of hooks?
>   What if the major mode already sets this hooks?

The active region case should be supported, IMO.  As for other modes,
what modes could usefully make use of this kind of region-filling?
Org mode might be the only one, but in that case it's something for
Org developers to chime in; I added Ihor to the discussion.

> Besides that, `fill-paragraph-semlf' calls `fill-forward-paragraph'
> internally, so it already takes into account what the major mode defines
> as paragraph.  And, `fill-region-as-paragraph-semlf' calls
> `fill-region-as-paragraph' internally, so if we add a hook to customize
> this function, it would take that into account.

Right.

> I guess the safest call for now is to provide `fill-paragraph-semlf' and
> `fill-region-as-paragraph-semlf' as commands that users or major modes
> can call directly.

That's what we currently do, right?

> What do you think?  Sorry, but I'm still wrapping my head around all the
> nuances of the filling code and how major modes make use of it.

I'd love to hear Stefan and Ihor to chime in and express their views.

Information forwarded to bug-gnu-emacs@HIDDEN:
bug#78561; Package emacs. Full text available.

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From: Roi Martin <jroi.martin@HIDDEN>
To: Juri Linkov <juri@HIDDEN>
Subject: Re: bug#78561: [PATCH] Add semantic linefeed support for paragraph
 filling
In-Reply-To: <87ldpt7zij.fsf@HIDDEN>
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Juri Linkov <juri@HIDDEN> writes:

> I tried to add to .dir-locals.el:
>
>   ((org-mode . ((fill-paragraph-function . fill-paragraph-semlf))))
>
> and it works nicely.

That's interesting.  If I create an org-mode buffer and set
`fill-paragraph-function' with:

  (setq-local fill-paragraph-function #'fill-paragraph-semlf)

Invoking `org-fill-paragraph' (bound to 'M-q') does not fill the
paragraph using semantic linefeeds.  However, `fill-paragraph' does.

I'll have to dig more into it.

> With one exception that it fails on the active region.
>
> But we could add a new variable, e.g. 'fill-region-function'
> that will be possible to customize to 'fill-region-as-paragraph-semlf'.

Check these sub-threads,

https://lists.gnu.org/archive/html/bug-gnu-emacs/2025-05/msg01088.html
https://lists.gnu.org/archive/html/bug-gnu-emacs/2025-06/msg00920.html

Maybe it is time to move the discussion to emacs-devel?

> Although it's strange that 'fill-region-as-paragraph-semlf'
> doesn't keep empty lines between paragraphs like 'fill-region' does.

`fill-region-as-paragraph-semlf' is analogous to
`fill-region-as-paragraph', so it removes any paragraph breaks in the
region and extra newlines at the end, and fills lines within the region.

        Roi

Information forwarded to bug-gnu-emacs@HIDDEN:
bug#78561; Package emacs. Full text available.

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From: Roi Martin <jroi.martin@HIDDEN>
To: Eli Zaretskii <eliz@HIDDEN>, Stefan Monnier <monnier@HIDDEN>
Subject: Re: bug#78561: [PATCH] Add semantic linefeed support for paragraph
 filling
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Eli Zaretskii <eliz@HIDDEN> writes:

>> Then, what's better?  Should we remove the following paragraph from the
>> doc string of `fill-paragraph-semlf'?
>> 
>>   You can use this function as the value of ‘fill-paragraph-function’, so
>>   ‘fill-paragraph’ and other filling commands will use it.
>> 
>> Or should we return t in `fill-paragraph-semlf'?
>
> I don't know.  Is returning fill-prefix useful in some important cases?

That's hard to say until we decide how to "wire" the semantic-linefeed
functions with the generic functions already provided by fill.el.  For
instance, coming back to some of the comments done by Stefan,

- How do we fill the paragraphs within the active region?  Should we add
  a new `fill-region-function' variable and provide a
  `fill-region-semlf' function?  Should we have a way to tell fill.el to
  use a custom `fill-region-as-paragraph' function?
- How do we change how major modes fill a paragraph or a region?  For
  instance, in the case of org-mode, how do we combine org-mode's
  fill-paragraph logic with semantic linefeeds?  Should the major mode
  be in charge of providing this feature leveraging the existing
  semantic-linefeed functions?  Should the user change a set of hooks?
  What if the major mode already sets this hooks?

Besides that, `fill-paragraph-semlf' calls `fill-forward-paragraph'
internally, so it already takes into account what the major mode defines
as paragraph.  And, `fill-region-as-paragraph-semlf' calls
`fill-region-as-paragraph' internally, so if we add a hook to customize
this function, it would take that into account.

I guess the safest call for now is to provide `fill-paragraph-semlf' and
`fill-region-as-paragraph-semlf' as commands that users or major modes
can call directly.  What these functions return should make sense in
isolation and, once we know how we want to wire everything together, we
can adapt them to the defined protocols providing wrappers or using
lambdas.  For instance,

  (defun fill-paragraph-function-semlf (&optional justify)
    "Fill paragraph at or after point using semantic linefeeds.
  This is a suitable value for `fill-paragraph-function'.
  
  For more details about semantic linefeeds, see `fill-paragraph-semlf'."
    (fill-paragraph-semlf justify)
    t)

That `fill-paragraph-semlf' returns the `fill-prefix' used to fill the
paragraph seems sound if we expect this function to be used by other
filling functions and matches the behavior of `fill-region-as-paragraph'
and `fill-paragraph' (when `fill-paragraph-function' is nil).

What do you think?  Sorry, but I'm still wrapping my head around all the
nuances of the filling code and how major modes make use of it.

        Roi

Information forwarded to bug-gnu-emacs@HIDDEN:
bug#78561; Package emacs. Full text available.

Message received at 78561 <at> debbugs.gnu.org:

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From: Juri Linkov <juri@HIDDEN>
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Subject: Re: bug#78561: [PATCH] Add semantic linefeed support for paragraph
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> One option is setting a key binding, like this:
>
>   (keymap-global-set "C-c q" #'fill-paragraph-semlf)
>
> Then you can invoke the command placing the cursor within a paragraph
> and using 'C-c q' (or 'M-x fill-paragraph-semlf').

Unfortunately, additional keybindings is too much baggage to bear:
more keys to remember and type, etc.

>> (setq-local fill-paragraph-function 'fill-paragraph-semlf)
>
> This works.  However, the behavior of the usual key binding 'M-q'
> depends on the major-mode that is enabled.  For instance, `org-mode'
> binds 'M-q' to `org-fill-paragraph' and won't invoke
> 'fill-paragraph-semlf.  But placing the cursor within a paragraph a
> invoking `fill-paragraph' works.  On the flip side, other modes
> (e.g. `outline-mode' or `texinfo-mode') don't do that and you can use
> 'M-q' to invoke `fill-paragraph' and, thus, `fill-paragraph-semlf'
> normally.

I tried to add to .dir-locals.el:

  ((org-mode . ((fill-paragraph-function . fill-paragraph-semlf))))

and it works nicely.  With one exception that it fails on the active region.

But we could add a new variable, e.g. 'fill-region-function'
that will be possible to customize to 'fill-region-as-paragraph-semlf'.

Although it's strange that 'fill-region-as-paragraph-semlf'
doesn't keep empty lines between paragraphs like 'fill-region' does.

Information forwarded to bug-gnu-emacs@HIDDEN:
bug#78561; Package emacs. Full text available.

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Date: Sun, 15 Jun 2025 13:24:43 +0300
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From: Eli Zaretskii <eliz@HIDDEN>
To: Roi Martin <jroi.martin@HIDDEN>
In-Reply-To: <87bjqpz5u1.fsf@HIDDEN> (message from Roi Martin on Sun, 15
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Subject: Re: bug#78561: [PATCH] Add semantic linefeed support for paragraph
 filling
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> From: Roi Martin <jroi.martin@HIDDEN>
> Cc: juri@HIDDEN, 78561 <at> debbugs.gnu.org
> Date: Sun, 15 Jun 2025 11:56:06 +0200
> 
> Eli Zaretskii <eliz@HIDDEN> writes:
> 
> >> From: Roi Martin <jroi.martin@HIDDEN>
> >> Cc: 78561 <at> debbugs.gnu.org
> >> Date: Sun, 15 Jun 2025 11:12:49 +0200
> >> 
> >> Eli Zaretskii <eliz@HIDDEN> writes:
> >> 
> >> > Neither, AFAIU?  Those two are commands, not fill-paragraph functions.
> >> > They don't implement the protocol defined for fill-paragraph
> >> > functions.
> >> 
> >> It should be possible to use `fill-paragraph-semlf' as
> >> `fill-paragraph-function'.
> >> 
> >> It takes a JUSTIFY argument, which is required by:
> >> 
> >>   (funcall function justify)
> >> 
> >> in the specific case in `fill-paragraph' ("2. Try
> >> fill-paragraph-function.").
> >> 
> >>   ;; 2. Try fill-paragraph-function.
> >>   (and (not (eq fill-paragraph-function t))
> >>             (or fill-paragraph-function
> >>                 (and (minibufferp (current-buffer))
> >>                      (= 1 (point-min))))
> >>             (let ((function (or fill-paragraph-function
> >>                                 ;; In the minibuffer, don't count
> >>                                 ;; the width of the prompt.
> >>                                 'fill-minibuffer-function))
> >>                   ;; If fill-paragraph-function is set, it probably
> >>                   ;; takes care of comments and stuff.  If not, it
> >>                   ;; will have to set fill-paragraph-handle-comment
> >>                   ;; back to t explicitly or return nil.
> >>                   (fill-paragraph-handle-comment nil)
> >>                   (fill-paragraph-function t))
> >>               (funcall function justify)))
> >> 
> >> It also returns a non-nil value to avoid executing the following cases
> >> in `fill-paragraph'.
> >> 
> >> Is there anything missing?
> >
> > The doc string of fill-paragraph-function says:
> >
> >   If the function returns nil, then ‘fill-paragraph’ does its normal work.
> >   A value of t means explicitly "do nothing special".
> >
> > By contrast, the doc string of fill-paragraph-semlf says:
> >
> >   Return the `fill-prefix' used for filling.
> >
> > Maybe the doc string is inaccurate, but if it's accurate, then its
> > return value is not what's expected from fill-paragraph-function.  Or
> > what did I miss?
> 
> No, you are right.
> 
> I decided to return `fill-prefix' in `fill-paragraph-semlf' because it
> seemed to have the same effect as returning t, based on the code I
> attached previously.  Also, returning `fill-paragraph' seemed more
> useful.  But, you are right, the contract mentions nil and t explicitly.
> 
> Then, what's better?  Should we remove the following paragraph from the
> doc string of `fill-paragraph-semlf'?
> 
>   You can use this function as the value of ‘fill-paragraph-function’, so
>   ‘fill-paragraph’ and other filling commands will use it.
> 
> Or should we return t in `fill-paragraph-semlf'?

I don't know.  Is returning fill-prefix useful in some important cases?

> Also, what does "do nothing special" mean exactly?

It means the fill-paragraph-function did all there is to do.

Information forwarded to bug-gnu-emacs@HIDDEN:
bug#78561; Package emacs. Full text available.

Message received at 78561 <at> debbugs.gnu.org:

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From: Roi Martin <jroi.martin@HIDDEN>
To: Eli Zaretskii <eliz@HIDDEN>
Subject: Re: bug#78561: [PATCH] Add semantic linefeed support for paragraph
 filling
In-Reply-To: <861prlqrom.fsf@HIDDEN>
References: <87jz67tzrp.fsf@HIDDEN>
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Eli Zaretskii <eliz@HIDDEN> writes:

>> From: Roi Martin <jroi.martin@HIDDEN>
>> Cc: 78561 <at> debbugs.gnu.org
>> Date: Sun, 15 Jun 2025 11:12:49 +0200
>> 
>> Eli Zaretskii <eliz@HIDDEN> writes:
>> 
>> > Neither, AFAIU?  Those two are commands, not fill-paragraph functions.
>> > They don't implement the protocol defined for fill-paragraph
>> > functions.
>> 
>> It should be possible to use `fill-paragraph-semlf' as
>> `fill-paragraph-function'.
>> 
>> It takes a JUSTIFY argument, which is required by:
>> 
>>   (funcall function justify)
>> 
>> in the specific case in `fill-paragraph' ("2. Try
>> fill-paragraph-function.").
>> 
>>   ;; 2. Try fill-paragraph-function.
>>   (and (not (eq fill-paragraph-function t))
>>             (or fill-paragraph-function
>>                 (and (minibufferp (current-buffer))
>>                      (= 1 (point-min))))
>>             (let ((function (or fill-paragraph-function
>>                                 ;; In the minibuffer, don't count
>>                                 ;; the width of the prompt.
>>                                 'fill-minibuffer-function))
>>                   ;; If fill-paragraph-function is set, it probably
>>                   ;; takes care of comments and stuff.  If not, it
>>                   ;; will have to set fill-paragraph-handle-comment
>>                   ;; back to t explicitly or return nil.
>>                   (fill-paragraph-handle-comment nil)
>>                   (fill-paragraph-function t))
>>               (funcall function justify)))
>> 
>> It also returns a non-nil value to avoid executing the following cases
>> in `fill-paragraph'.
>> 
>> Is there anything missing?
>
> The doc string of fill-paragraph-function says:
>
>   If the function returns nil, then ‘fill-paragraph’ does its normal work.
>   A value of t means explicitly "do nothing special".
>
> By contrast, the doc string of fill-paragraph-semlf says:
>
>   Return the `fill-prefix' used for filling.
>
> Maybe the doc string is inaccurate, but if it's accurate, then its
> return value is not what's expected from fill-paragraph-function.  Or
> what did I miss?

No, you are right.

I decided to return `fill-prefix' in `fill-paragraph-semlf' because it
seemed to have the same effect as returning t, based on the code I
attached previously.  Also, returning `fill-paragraph' seemed more
useful.  But, you are right, the contract mentions nil and t explicitly.

Then, what's better?  Should we remove the following paragraph from the
doc string of `fill-paragraph-semlf'?

  You can use this function as the value of ‘fill-paragraph-function’, so
  ‘fill-paragraph’ and other filling commands will use it.

Or should we return t in `fill-paragraph-semlf'?

Also, what does "do nothing special" mean exactly?

        Roi

Information forwarded to bug-gnu-emacs@HIDDEN:
bug#78561; Package emacs. Full text available.

Message received at 78561 <at> debbugs.gnu.org:

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In-Reply-To: <87h60hz7u6.fsf@HIDDEN> (message from Roi Martin on Sun, 15
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Subject: Re: bug#78561: [PATCH] Add semantic linefeed support for paragraph
 filling
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> From: Roi Martin <jroi.martin@HIDDEN>
> Cc: 78561 <at> debbugs.gnu.org
> Date: Sun, 15 Jun 2025 11:12:49 +0200
> 
> Eli Zaretskii <eliz@HIDDEN> writes:
> 
> > Neither, AFAIU?  Those two are commands, not fill-paragraph functions.
> > They don't implement the protocol defined for fill-paragraph
> > functions.
> 
> It should be possible to use `fill-paragraph-semlf' as
> `fill-paragraph-function'.
> 
> It takes a JUSTIFY argument, which is required by:
> 
>   (funcall function justify)
> 
> in the specific case in `fill-paragraph' ("2. Try
> fill-paragraph-function.").
> 
>   ;; 2. Try fill-paragraph-function.
>   (and (not (eq fill-paragraph-function t))
>             (or fill-paragraph-function
>                 (and (minibufferp (current-buffer))
>                      (= 1 (point-min))))
>             (let ((function (or fill-paragraph-function
>                                 ;; In the minibuffer, don't count
>                                 ;; the width of the prompt.
>                                 'fill-minibuffer-function))
>                   ;; If fill-paragraph-function is set, it probably
>                   ;; takes care of comments and stuff.  If not, it
>                   ;; will have to set fill-paragraph-handle-comment
>                   ;; back to t explicitly or return nil.
>                   (fill-paragraph-handle-comment nil)
>                   (fill-paragraph-function t))
>               (funcall function justify)))
> 
> It also returns a non-nil value to avoid executing the following cases
> in `fill-paragraph'.
> 
> Is there anything missing?

The doc string of fill-paragraph-function says:

  If the function returns nil, then ‘fill-paragraph’ does its normal work.
  A value of t means explicitly "do nothing special".

By contrast, the doc string of fill-paragraph-semlf says:

  Return the `fill-prefix' used for filling.

Maybe the doc string is inaccurate, but if it's accurate, then its
return value is not what's expected from fill-paragraph-function.  Or
what did I miss?

Information forwarded to bug-gnu-emacs@HIDDEN:
bug#78561; Package emacs. Full text available.

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From: Roi Martin <jroi.martin@HIDDEN>
To: Eli Zaretskii <eliz@HIDDEN>, Juri Linkov <juri@HIDDEN>
Subject: Re: bug#78561: [PATCH] Add semantic linefeed support for paragraph
 filling
In-Reply-To: <867c1dqwwi.fsf@HIDDEN>
References: <87jz67tzrp.fsf@HIDDEN>
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Eli Zaretskii <eliz@HIDDEN> writes:

>> (setq-local fill-paragraph-function 'fill-paragraph-semlf)
>> 
>> or this
>> 
>> (setq-local fill-paragraph-function 'fill-region-as-paragraph-semlf)
>
> Neither, AFAIU?  Those two are commands, not fill-paragraph functions.
> They don't implement the protocol defined for fill-paragraph
> functions.

It should be possible to use `fill-paragraph-semlf' as
`fill-paragraph-function'.

It takes a JUSTIFY argument, which is required by:

  (funcall function justify)

in the specific case in `fill-paragraph' ("2. Try
fill-paragraph-function.").

  ;; 2. Try fill-paragraph-function.
  (and (not (eq fill-paragraph-function t))
            (or fill-paragraph-function
                (and (minibufferp (current-buffer))
                     (= 1 (point-min))))
            (let ((function (or fill-paragraph-function
                                ;; In the minibuffer, don't count
                                ;; the width of the prompt.
                                'fill-minibuffer-function))
                  ;; If fill-paragraph-function is set, it probably
                  ;; takes care of comments and stuff.  If not, it
                  ;; will have to set fill-paragraph-handle-comment
                  ;; back to t explicitly or return nil.
                  (fill-paragraph-handle-comment nil)
                  (fill-paragraph-function t))
              (funcall function justify)))

It also returns a non-nil value to avoid executing the following cases
in `fill-paragraph'.

Is there anything missing?

        Roi

Information forwarded to bug-gnu-emacs@HIDDEN:
bug#78561; Package emacs. Full text available.

Message received at 78561 <at> debbugs.gnu.org:

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From: Roi Martin <jroi.martin@HIDDEN>
To: Juri Linkov <juri@HIDDEN>, 78561 <at> debbugs.gnu.org,
 monnier@HIDDEN, eliz@HIDDEN
Subject: Re: bug#78561: [PATCH] Add semantic linefeed support for paragraph
 filling
In-Reply-To: <87zfe9a56j.fsf@HIDDEN>
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Juri Linkov <juri@HIDDEN> writes:

> Sorry if I missed something, but I tried to use this feature
> and can't find in etc/NEWS whether to set this

One option is setting a key binding, like this:

  (keymap-global-set "C-c q" #'fill-paragraph-semlf)

Then you can invoke the command placing the cursor within a paragraph
and using 'C-c q' (or 'M-x fill-paragraph-semlf').

> (setq-local fill-paragraph-function 'fill-paragraph-semlf)

This works.  However, the behavior of the usual key binding 'M-q'
depends on the major-mode that is enabled.  For instance, `org-mode'
binds 'M-q' to `org-fill-paragraph' and won't invoke
'fill-paragraph-semlf.  But placing the cursor within a paragraph a
invoking `fill-paragraph' works.  On the flip side, other modes
(e.g. `outline-mode' or `texinfo-mode') don't do that and you can use
'M-q' to invoke `fill-paragraph' and, thus, `fill-paragraph-semlf'
normally.

How to fix this needs further discussion.  Eli, Stefan any
recommendation?

Personally, for now, I'm setting a specific key binding to invoke
`fill-paragraph-semlf'.

        Roi

Information forwarded to bug-gnu-emacs@HIDDEN:
bug#78561; Package emacs. Full text available.

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Date: Sun, 15 Jun 2025 11:08:47 +0300
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From: Eli Zaretskii <eliz@HIDDEN>
To: Rudolf =?utf-8?Q?Adamkovi=C4=8D?= <rudolf@HIDDEN>
In-Reply-To: <m2sek1o35h.fsf@HIDDEN> (message from Rudolf
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Subject: Re: bug#78561: [PATCH] Add semantic linefeed support for paragraph
 filling
References: <87jz67tzrp.fsf@HIDDEN>
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> From: Rudolf Adamkovič <rudolf@HIDDEN>
> Cc: eliz@HIDDEN, jroi.martin@HIDDEN
> Date: Sun, 15 Jun 2025 09:49:30 +0200
> 
> BTW, when the discussion started, few knew what "semantic line breaks"
> were.  The new function names shorten the term to "semlf".  I tried to
> search the Internet for "semlf" and I found only this thread and the
> Emacs package discussed here.  Is there a good reason for shortening
> `semantic-line-breaks' to `semlf' here?

Apart of its being significantly shorter?  No reason, I suppose.  But
fill-region-as-paragraph-semantic-line-breaks is IMO too long for a
command.

Information forwarded to bug-gnu-emacs@HIDDEN:
bug#78561; Package emacs. Full text available.

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From: Rudolf =?utf-8?Q?Adamkovi=C4=8D?= <rudolf@HIDDEN>
To: Juri Linkov <juri@HIDDEN>, 78561 <at> debbugs.gnu.org
Subject: Re: bug#78561: [PATCH] Add semantic linefeed support for paragraph
 filling
In-Reply-To: <87zfe9a56j.fsf@HIDDEN>
References: <87jz67tzrp.fsf@HIDDEN>
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Juri Linkov <juri@HIDDEN> writes:

> (setq-local fill-paragraph-function 'fill-paragraph-semlf)
>
> or this
>
> (setq-local fill-paragraph-function 'fill-region-as-paragraph-semlf)

BTW, when the discussion started, few knew what "semantic line breaks"
were.  The new function names shorten the term to "semlf".  I tried to
search the Internet for "semlf" and I found only this thread and the
Emacs package discussed here.  Is there a good reason for shortening
`semantic-line-breaks' to `semlf' here?

Rudy
--=20
"The whole science is nothing more than a refinement of everyday
thinking."  --- Albert Einstein, 1879-1955

Rudolf Adamkovi=C4=8D <rudolf@HIDDEN> [he/him]
http://adamkovic.org

Information forwarded to bug-gnu-emacs@HIDDEN:
bug#78561; Package emacs. Full text available.

Message received at 78561 <at> debbugs.gnu.org:

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To: Juri Linkov <juri@HIDDEN>
In-Reply-To: <87zfe9a56j.fsf@HIDDEN> (message from Juri Linkov on
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Subject: Re: bug#78561: [PATCH] Add semantic linefeed support for paragraph
 filling
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> From: Juri Linkov <juri@HIDDEN>
> Cc: eliz@HIDDEN,  jroi.martin@HIDDEN
> Date: Sun, 15 Jun 2025 09:39:24 +0300
> 
> >> The latest version is far from perfect but works well for the most
> >> common use cases.
> >
> > Thanks, I've now installed this on the master branch, and I'm
> > therefore closing the bug.
> 
> Sorry if I missed something, but I tried to use this feature
> and can't find in etc/NEWS whether to set this
> 
> (setq-local fill-paragraph-function 'fill-paragraph-semlf)
> 
> or this
> 
> (setq-local fill-paragraph-function 'fill-region-as-paragraph-semlf)

Neither, AFAIU?  Those two are commands, not fill-paragraph functions.
They don't implement the protocol defined for fill-paragraph
functions.

Information forwarded to bug-gnu-emacs@HIDDEN:
bug#78561; Package emacs. Full text available.

Message received at 78561 <at> debbugs.gnu.org:

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>> The latest version is far from perfect but works well for the most
>> common use cases.
>
> Thanks, I've now installed this on the master branch, and I'm
> therefore closing the bug.

Sorry if I missed something, but I tried to use this feature
and can't find in etc/NEWS whether to set this

(setq-local fill-paragraph-function 'fill-paragraph-semlf)

or this

(setq-local fill-paragraph-function 'fill-region-as-paragraph-semlf)

Information forwarded to bug-gnu-emacs@HIDDEN:
bug#78561; Package emacs. Full text available.

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Subject: Re: bug#78561: [PATCH] Add semantic linefeed support for paragraph
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> From: Roi Martin <jroi.martin@HIDDEN>
> Cc: Eli Zaretskii <eliz@HIDDEN>, rms@HIDDEN, 78561 <at> debbugs.gnu.org,
>  mbork@HIDDEN
> Date: Tue, 03 Jun 2025 08:45:17 +0200
> 
> Stefan Monnier <monnier@HIDDEN> writes:
> 
> > Side comment, tho: it would be good to get rid of the `with-restriction`
> > so that the code can see the surrounding text.  In the past such
> > restrictions in `fill.el` have posed problems for example when we want
> > to refill code in a way that obeys indentation rules or that
> > needs to distinguish filling within strings vs filling within comments.
> 
> The latest version is far from perfect but works well for the most
> common use cases.  The included tests can given you an idea of the
> current state.  Are you OK with tackling the `with-restriction'
> improvement in a future patch?

Thanks, I've now installed this on the master branch, and I'm
therefore closing the bug.

Notification sent to Roi Martin <jroi.martin@HIDDEN>:
bug acknowledged by developer. Full text available.

Reply sent to Eli Zaretskii <eliz@HIDDEN>:
You have taken responsibility. Full text available.

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From: Stefan Monnier <monnier@HIDDEN>
To: Roi Martin <jroi.martin@HIDDEN>
Subject: Re: bug#78561: [PATCH] Add semantic linefeed support for paragraph
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>  Are you OK with tackling the `with-restriction'
> improvement in a future patch?

Yes.


        Stefan

Information forwarded to bug-gnu-emacs@HIDDEN:
bug#78561; Package emacs. Full text available.

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From: Roi Martin <jroi.martin@HIDDEN>
To: Stefan Monnier <monnier@HIDDEN>
Subject: Re: bug#78561: [PATCH] Add semantic linefeed support for paragraph
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Stefan Monnier <monnier@HIDDEN> writes:

> Side comment, tho: it would be good to get rid of the `with-restriction`
> so that the code can see the surrounding text.  In the past such
> restrictions in `fill.el` have posed problems for example when we want
> to refill code in a way that obeys indentation rules or that
> needs to distinguish filling within strings vs filling within comments.

The latest version is far from perfect but works well for the most
common use cases.  The included tests can given you an idea of the
current state.  Are you OK with tackling the `with-restriction'
improvement in a future patch?


        Roi

Information forwarded to bug-gnu-emacs@HIDDEN:
bug#78561; Package emacs. Full text available.

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From: Stefan Monnier <monnier@HIDDEN>
To: Roi Martin <jroi.martin@HIDDEN>
Subject: Re: bug#78561: [PATCH] Add semantic linefeed support for paragraph
 filling
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> RMS replied to me with a review, where he mentioned that this feature
> would be more convenient if it were a minor mode.  Eli, Stefan, what do
> you think?  If it makes sense, we can add it in a future patch.

Yes, it goes in the same direction of my TODO of adding more hooks to
control various aspects of filling.  (One of) Those hooks should make it
easy to write such a minor mode.

> I've attached a new version of the patch.  It includes the following
> changes compared to the previous version:

LGTM.

Side comment, tho: it would be good to get rid of the `with-restriction`
so that the code can see the surrounding text.  In the past such
restrictions in `fill.el` have posed problems for example when we want
to refill code in a way that obeys indentation rules or that
needs to distinguish filling within strings vs filling within comments.


        Stefan

Information forwarded to bug-gnu-emacs@HIDDEN:
bug#78561; Package emacs. Full text available.

Message received at 78561 <at> debbugs.gnu.org:

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From: Roi Martin <jroi.martin@HIDDEN>
To: Eli Zaretskii <eliz@HIDDEN>, Stefan Monnier <monnier@HIDDEN>,
 rms@HIDDEN
Subject: Re: bug#78561: [PATCH] Add semantic linefeed support for paragraph
 filling
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--=-=-=
Content-Type: text/plain

Eli Zaretskii <eliz@HIDDEN> writes:

> It's okay, but please make sure there are two spaces between
> sentences, not one.  There are quite a few cases in the patch where
> this is not so.

Fixed in doc strings.  The rest of cases correspond to test data where
we want to verify that `sentence-end-double-space' is respected.

> Also, the commit log message should mention the bug number.

Fixed.

RMS replied to me with a review, where he mentioned that this feature
would be more convenient if it were a minor mode.  Eli, Stefan, what do
you think?  If it makes sense, we can add it in a future patch.

Also, with regard to the paragraph:

  For more details about semantic linefeeds, see `https://sembr.org/' and
  `https://rhodesmill.org/brandon/2012/one-sentence-per-line/'."

He raised the following concern:

> This sort of information doesn't belong in an Emacs doc string.
> If some of it isimportant for using this feature right, we
> should state the point in this and other doc strings, or in
> the Emacs Manual,  That way we can propagate it and update it.

> If information is "if you'd like to know more", not necessary for peopke
> to read to know how to use the feature, then we can refer to it on a web page.
> But we need to have reason to be confident that page will exist for many
> years, serving the same purpose, in a way we would not be ashamed to link to.
> 
> Otherwise, depending on it is asking for trouble.
> 
> How much material is importaht to link to for this purpose?

As I previously said, I think it should be fine to add a short
explanation in the doc string or in the manual instead of linking with
external sites that are subject to change or be deleted in the future.

I've attached a new version of the patch.  It includes the following
changes compared to the previous version:

- Separate sentences in doc strings using two spaces.
- Add bug number to commit log message.
- Slightly reword doc strings, following a suggestion from RMS.
- Add test to check that it is possible to "revert" semlf-filling by
  refilling the paragraph, following a suggestion from RMS.

        Roi


--=-=-=
Content-Type: text/x-patch
Content-Disposition: attachment;
 filename=0001-Add-semantic-linefeed-support-for-paragraph-filling.patch

From db5067064d89ea16b2313622be3e6bb32e9293f4 Mon Sep 17 00:00:00 2001
From: Roi Martin <jroi.martin@HIDDEN>
Date: Fri, 21 Mar 2025 14:22:46 +0100
Subject: [PATCH] Add semantic linefeed support for paragraph filling

* lisp/textmodes/fill.el (fill-region-as-paragraph-semlf): Add function
to fill a region using semantic linefeeds as if it were a single
paragraph.
(fill-paragraph-semlf): Add function to fill paragraph using semantic
linefeeds.
* test/lisp/textmodes/fill-tests.el
(fill-test-fill-region-as-paragraph-semlf)
(fill-test-fill-paragraph-semlf)
(fill-test-fill-paragraph-semlf-fill-paragraph-function)
(fill-test-fill-paragraph-semlf-justify)
(fill-test-fill-paragraph-semlf-sentence-end-double-space)
(fill-test-fill-paragraph-semlf-fill-column)
(fill-test-fill-paragraph-semlf-punctuation-marks)
(fill-test-fill-paragraph-semlf-twice)
(fill-test-fill-paragraph-semlf-fill-prefix)
(fill-test-fill-paragraph-semlf-indented-block)
(fill-test-fill-paragraph-semlf-revert)
(fill-test-fill-paragraph-semlf-emacs-lisp-mode)
(fill-test-fill-paragraph-semlf-c-mode)
(fill-test-fill-paragraph-semlf-org-mode)
(fill-test-fill-paragraph-semlf-markdown-mode): Add tests.
* test/lisp/textmodes/fill-resources/semlf-c-mode.erts:
* test/lisp/textmodes/fill-resources/semlf-emacs-lisp-mode.erts:
* test/lisp/textmodes/fill-resources/semlf-fill-column.erts:
* test/lisp/textmodes/fill-resources/semlf-fill-paragraph-function.erts:
* test/lisp/textmodes/fill-resources/semlf-fill-prefix.erts:
* test/lisp/textmodes/fill-resources/semlf-fill-region-as-paragraph.erts:
* test/lisp/textmodes/fill-resources/semlf-indented-block.erts:
* test/lisp/textmodes/fill-resources/semlf-justify.erts:
* test/lisp/textmodes/fill-resources/semlf-markdown-mode.erts:
* test/lisp/textmodes/fill-resources/semlf-org-mode.erts:
* test/lisp/textmodes/fill-resources/semlf-punctuation-marks.erts:
* test/lisp/textmodes/fill-resources/semlf-revert.erts:
* test/lisp/textmodes/fill-resources/semlf-sentence-end-double-space.erts:
* test/lisp/textmodes/fill-resources/semlf-twice.erts:
* test/lisp/textmodes/fill-resources/semlf.erts: Add test data.  (Bug#78561)
---
 lisp/textmodes/fill.el                        |  92 +++++++++
 .../fill-resources/semlf-c-mode.erts          | 183 ++++++++++++++++++
 .../fill-resources/semlf-emacs-lisp-mode.erts |  87 +++++++++
 .../fill-resources/semlf-fill-column.erts     |  15 ++
 .../semlf-fill-paragraph-function.erts        |  12 ++
 .../fill-resources/semlf-fill-prefix.erts     |  35 ++++
 .../semlf-fill-region-as-paragraph.erts       |  37 ++++
 .../fill-resources/semlf-indented-block.erts  |  31 +++
 .../fill-resources/semlf-justify.erts         |  12 ++
 .../fill-resources/semlf-markdown-mode.erts   | 129 ++++++++++++
 .../fill-resources/semlf-org-mode.erts        | 122 ++++++++++++
 .../semlf-punctuation-marks.erts              |  13 ++
 .../fill-resources/semlf-revert.erts          |  11 ++
 .../semlf-sentence-end-double-space.erts      |  13 ++
 .../textmodes/fill-resources/semlf-twice.erts |  12 ++
 test/lisp/textmodes/fill-resources/semlf.erts |  88 +++++++++
 test/lisp/textmodes/fill-tests.el             | 112 +++++++++++
 17 files changed, 1004 insertions(+)
 create mode 100644 test/lisp/textmodes/fill-resources/semlf-c-mode.erts
 create mode 100644 test/lisp/textmodes/fill-resources/semlf-emacs-lisp-mode.erts
 create mode 100644 test/lisp/textmodes/fill-resources/semlf-fill-column.erts
 create mode 100644 test/lisp/textmodes/fill-resources/semlf-fill-paragraph-function.erts
 create mode 100644 test/lisp/textmodes/fill-resources/semlf-fill-prefix.erts
 create mode 100644 test/lisp/textmodes/fill-resources/semlf-fill-region-as-paragraph.erts
 create mode 100644 test/lisp/textmodes/fill-resources/semlf-indented-block.erts
 create mode 100644 test/lisp/textmodes/fill-resources/semlf-justify.erts
 create mode 100644 test/lisp/textmodes/fill-resources/semlf-markdown-mode.erts
 create mode 100644 test/lisp/textmodes/fill-resources/semlf-org-mode.erts
 create mode 100644 test/lisp/textmodes/fill-resources/semlf-punctuation-marks.erts
 create mode 100644 test/lisp/textmodes/fill-resources/semlf-revert.erts
 create mode 100644 test/lisp/textmodes/fill-resources/semlf-sentence-end-double-space.erts
 create mode 100644 test/lisp/textmodes/fill-resources/semlf-twice.erts
 create mode 100644 test/lisp/textmodes/fill-resources/semlf.erts

diff --git a/lisp/textmodes/fill.el b/lisp/textmodes/fill.el
index e38d030734fb..386a88bda3a8 100644
--- a/lisp/textmodes/fill.el
+++ b/lisp/textmodes/fill.el
@@ -1583,4 +1583,96 @@ fill-individual-paragraphs-citation
 	"")
     string))
 
+(defun fill-region-as-paragraph-semlf (from to &optional justify
+                                            nosqueeze squeeze-after)
+  "Fill the region using semantic linefeeds as if it were a single paragraph.
+This command removes any paragraph breaks in the region and extra
+newlines at the end, and fills lines within the region.  Text is
+refilled putting a newline character after each sentence, calling
+`forward-sentence' to find the ends of sentences.  If
+`sentence-end-double-space' is non-nil, period followed by one space is
+not the end of a sentence.
+
+If JUSTIFY is non-nil (interactively, with prefix argument), justify as
+well.  If NOSQUEEZE is non-nil, do not to make spaces between words
+canonical before filling.  SQUEEZE-AFTER, if non-nil, should be a buffer
+position; it means canonicalize spaces only starting from that position.
+See `canonically-space-region' for the meaning of canonicalization of
+spaces.  The variable `fill-column' controls the width for filling.
+
+Return the `fill-prefix' used for filling.
+
+For more details about semantic linefeeds, see `fill-paragraph-semlf'."
+  (interactive (progn
+		 (barf-if-buffer-read-only)
+		 (list (region-beginning)
+                       (region-end)
+		       (if current-prefix-arg 'full))))
+  (unless (memq justify '(t nil none full center left right))
+    (setq justify 'full))
+
+  (let ((from (min from to))
+        (to (max from to))
+        pfx)
+    (goto-char from)
+    (with-restriction (line-beginning-position) to
+      (let ((fill-column (point-max)))
+        (setq pfx (or (save-excursion
+                        (fill-region-as-paragraph (point)
+                                                  (point-max)
+                                                  nil
+                                                  nosqueeze
+                                                  squeeze-after))
+                      "")))
+      (while (not (eobp))
+        (let ((fill-prefix pfx))
+	  (fill-region-as-paragraph (point)
+				    (progn (forward-sentence) (point))
+				    justify
+                                    nosqueeze
+                                    squeeze-after))
+        (when (and (> (point) (line-beginning-position))
+		   (< (point) (line-end-position)))
+	  (delete-horizontal-space)
+	  (insert "\n")
+	  (insert pfx))))
+    (unless (eobp) (forward-char 1))
+    pfx))
+
+(defun fill-paragraph-semlf (&optional justify)
+  "Fill paragraph at or after point using semantic linefeeds.
+Refill text putting a newline character after each sentence, calling
+`forward-sentence' to find the ends of sentences.  If
+`sentence-end-double-space' is non-nil, period followed by one space is
+not the end of a sentence.
+
+If JUSTIFY is non-nil (interactively, with prefix argument), justify as
+well.  The variable `fill-column' controls the width for filling.
+
+Return the `fill-prefix' used for filling.
+
+You can use this function as the value of `fill-paragraph-function', so
+`fill-paragraph' and other filling commands will use it.
+
+For more details about semantic linefeeds, see `https://sembr.org/' and
+`https://rhodesmill.org/brandon/2012/one-sentence-per-line/'."
+  (interactive (progn
+		 (barf-if-buffer-read-only)
+		 (list (if current-prefix-arg 'full))))
+  (unless (memq justify '(t nil none full center left right))
+    (setq justify 'full))
+
+  (save-excursion
+    (let ((to (progn
+		(fill-forward-paragraph 1)
+		(backward-word)
+		(end-of-line)
+		(point)))
+	  (from (progn
+		  (fill-forward-paragraph -1)
+		  (forward-word)
+		  (beginning-of-line)
+		  (point))))
+      (fill-region-as-paragraph-semlf from to justify))))
+
 ;;; fill.el ends here
diff --git a/test/lisp/textmodes/fill-resources/semlf-c-mode.erts b/test/lisp/textmodes/fill-resources/semlf-c-mode.erts
new file mode 100644
index 000000000000..a28eb68cfc6a
--- /dev/null
+++ b/test/lisp/textmodes/fill-resources/semlf-c-mode.erts
@@ -0,0 +1,183 @@
+Point-Char: |
+
+Name: c-mode - single-line
+
+=-=
+// Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do
+// eiusmod tempor.  Incididunt ut labore et dolore magna aliqua. Ut enim
+// ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut.
+=-=
+// Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do
+// eiusmod tempor.
+// Incididunt ut labore et dolore magna aliqua. Ut enim ad minim
+// veniam, quis nostrud exercitation ullamco laboris nisi ut.
+=-=-=
+
+Name: c-mode - single-line - fill-prefix - marker
+
+=-=
+// - Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor.  Incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut.
+// - Aliquip ex ea commodo consequat.  Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur.
+// - Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.
+=-=
+// - Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do
+// - eiusmod tempor.
+// - Incididunt ut labore et dolore magna aliqua. Ut enim ad minim
+// - veniam, quis nostrud exercitation ullamco laboris nisi ut.
+// - Aliquip ex ea commodo consequat.
+// - Duis aute irure dolor in reprehenderit in voluptate velit esse
+// - cillum dolore eu fugiat nulla pariatur.
+// - Excepteur sint occaecat cupidatat non proident, sunt in culpa qui
+// - officia deserunt mollit anim id est laborum.
+=-=-=
+
+Name: c-mode - single-line - fill-prefix - whitespace
+
+=-=
+// - Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor.  Incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut.
+//   Aliquip ex ea commodo consequat.  Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur.
+//   Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.
+=-=
+// - Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do
+//   eiusmod tempor.
+//   Incididunt ut labore et dolore magna aliqua. Ut enim ad minim
+//   veniam, quis nostrud exercitation ullamco laboris nisi ut.
+//   Aliquip ex ea commodo consequat.
+//   Duis aute irure dolor in reprehenderit in voluptate velit esse
+//   cillum dolore eu fugiat nulla pariatur.
+//   Excepteur sint occaecat cupidatat non proident, sunt in culpa qui
+//   officia deserunt mollit anim id est laborum.
+=-=-=
+
+Name: c-mode - single-line - indented block
+
+=-=
+// Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do
+// eiusmod tempor.  Incididunt ut labore et dolore magna aliqua. Ut
+// enim ad minim veniam, quis nostrud exercitation ullamco laboris
+// nisi ut.
+//
+// 	|Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed
+// 	do eiusmod tempor.  Incididunt ut labore et dolore magna
+// 	aliqua. Ut enim ad minim veniam, quis nostrud exercitation
+// 	ullamco laboris nisi ut.
+//
+// Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do
+// eiusmod tempor.  Incididunt ut labore et dolore magna aliqua. Ut
+// enim ad minim veniam, quis nostrud exercitation ullamco laboris
+// nisi ut.
+=-=
+// Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do
+// eiusmod tempor.  Incididunt ut labore et dolore magna aliqua. Ut
+// enim ad minim veniam, quis nostrud exercitation ullamco laboris
+// nisi ut.
+//
+// 	Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed
+// 	do eiusmod tempor.
+// 	Incididunt ut labore et dolore magna aliqua. Ut enim ad minim
+// 	veniam, quis nostrud exercitation ullamco laboris nisi ut.
+//
+// Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do
+// eiusmod tempor.  Incididunt ut labore et dolore magna aliqua. Ut
+// enim ad minim veniam, quis nostrud exercitation ullamco laboris
+// nisi ut.
+=-=-=
+
+Name: c-mode - multi-line
+
+=-=
+/*
+ * Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do
+ * eiusmod tempor.  Incididunt ut labore et dolore magna aliqua. Ut enim
+ * ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut.
+ */
+=-=
+/*
+ * Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do
+ * eiusmod tempor.
+ * Incididunt ut labore et dolore magna aliqua. Ut enim ad minim
+ * veniam, quis nostrud exercitation ullamco laboris nisi ut.
+ */
+=-=-=
+
+Name: c-mode - multi-line - fill-prefix - marker
+
+=-=
+/*
+ * - Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor.  Incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut.
+ * - Aliquip ex ea commodo consequat.  Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur.
+ * - Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.
+ */
+=-=
+/*
+ * - Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do
+ * - eiusmod tempor.
+ * - Incididunt ut labore et dolore magna aliqua. Ut enim ad minim
+ * - veniam, quis nostrud exercitation ullamco laboris nisi ut.
+ * - Aliquip ex ea commodo consequat.
+ * - Duis aute irure dolor in reprehenderit in voluptate velit esse
+ * - cillum dolore eu fugiat nulla pariatur.
+ * - Excepteur sint occaecat cupidatat non proident, sunt in culpa qui
+ * - officia deserunt mollit anim id est laborum.
+ */
+=-=-=
+
+Name: c-mode - multi-line - fill-prefix - whitespace
+
+=-=
+/*
+ * - Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor.  Incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut.
+ *   Aliquip ex ea commodo consequat.  Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur.
+ *   Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.
+ */
+=-=
+/*
+ * - Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do
+ *   eiusmod tempor.
+ *   Incididunt ut labore et dolore magna aliqua. Ut enim ad minim
+ *   veniam, quis nostrud exercitation ullamco laboris nisi ut.
+ *   Aliquip ex ea commodo consequat.
+ *   Duis aute irure dolor in reprehenderit in voluptate velit esse
+ *   cillum dolore eu fugiat nulla pariatur.
+ *   Excepteur sint occaecat cupidatat non proident, sunt in culpa qui
+ *   officia deserunt mollit anim id est laborum.
+ */
+=-=-=
+
+Name: c-mode - multi-line - indented block
+
+=-=
+/*
+ * Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do
+ * eiusmod tempor.  Incididunt ut labore et dolore magna aliqua. Ut
+ * enim ad minim veniam, quis nostrud exercitation ullamco laboris
+ * nisi ut.
+ *
+ * 	|Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed
+ * 	do eiusmod tempor.  Incididunt ut labore et dolore magna
+ * 	aliqua. Ut enim ad minim veniam, quis nostrud exercitation
+ * 	ullamco laboris nisi ut.
+ *
+ * Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do
+ * eiusmod tempor.  Incididunt ut labore et dolore magna aliqua. Ut
+ * enim ad minim veniam, quis nostrud exercitation ullamco laboris
+ * nisi ut.
+ */
+=-=
+/*
+ * Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do
+ * eiusmod tempor.  Incididunt ut labore et dolore magna aliqua. Ut
+ * enim ad minim veniam, quis nostrud exercitation ullamco laboris
+ * nisi ut.
+ *
+ * 	Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed
+ * 	do eiusmod tempor.
+ * 	Incididunt ut labore et dolore magna aliqua. Ut enim ad minim
+ * 	veniam, quis nostrud exercitation ullamco laboris nisi ut.
+ *
+ * Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do
+ * eiusmod tempor.  Incididunt ut labore et dolore magna aliqua. Ut
+ * enim ad minim veniam, quis nostrud exercitation ullamco laboris
+ * nisi ut.
+ */
+=-=-=
diff --git a/test/lisp/textmodes/fill-resources/semlf-emacs-lisp-mode.erts b/test/lisp/textmodes/fill-resources/semlf-emacs-lisp-mode.erts
new file mode 100644
index 000000000000..fe71ee32c1aa
--- /dev/null
+++ b/test/lisp/textmodes/fill-resources/semlf-emacs-lisp-mode.erts
@@ -0,0 +1,87 @@
+Point-Char: |
+
+Name: emacs-lisp-mode
+
+=-=
+;; Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do
+;; eiusmod tempor.  Incididunt ut labore et dolore magna aliqua. Ut enim
+;; ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut.
+=-=
+;; Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do
+;; eiusmod tempor.
+;; Incididunt ut labore et dolore magna aliqua. Ut enim ad minim
+;; veniam, quis nostrud exercitation ullamco laboris nisi ut.
+=-=-=
+
+Name: emacs-lisp-mode - fill-prefix - marker
+
+=-=
+;; - Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor.  Incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut.
+;; - Aliquip ex ea commodo consequat.  Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur.
+;; - Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.
+=-=
+;; - Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do
+;; - eiusmod tempor.
+;; - Incididunt ut labore et dolore magna aliqua. Ut enim ad minim
+;; - veniam, quis nostrud exercitation ullamco laboris nisi ut.
+;; - Aliquip ex ea commodo consequat.
+;; - Duis aute irure dolor in reprehenderit in voluptate velit esse
+;; - cillum dolore eu fugiat nulla pariatur.
+;; - Excepteur sint occaecat cupidatat non proident, sunt in culpa qui
+;; - officia deserunt mollit anim id est laborum.
+=-=-=
+
+Name: emacs-lisp-mode - fill-prefix - whitespace
+
+=-=
+;; - Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor.  Incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut.
+;;   Aliquip ex ea commodo consequat.  Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur.
+;;   Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.
+=-=
+;; - Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do
+;;   eiusmod tempor.
+;;   Incididunt ut labore et dolore magna aliqua. Ut enim ad minim
+;;   veniam, quis nostrud exercitation ullamco laboris nisi ut.
+;;   Aliquip ex ea commodo consequat.
+;;   Duis aute irure dolor in reprehenderit in voluptate velit esse
+;;   cillum dolore eu fugiat nulla pariatur.
+;;   Excepteur sint occaecat cupidatat non proident, sunt in culpa qui
+;;   officia deserunt mollit anim id est laborum.
+=-=-=
+
+Name: emacs-lisp-mode - indented block
+
+The `fill-forward-paragraph' function jumps to the beginning/end of
+the comment.
+
+=-=
+;; Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do
+;; eiusmod tempor.  Incididunt ut labore et dolore magna aliqua. Ut
+;; enim ad minim veniam, quis nostrud exercitation ullamco laboris
+;; nisi ut.
+
+;; 	|Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed
+;; 	do eiusmod tempor.  Incididunt ut labore et dolore magna
+;; 	aliqua. Ut enim ad minim veniam, quis nostrud exercitation
+;; 	ullamco laboris nisi ut.
+
+;; Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do
+;; eiusmod tempor.  Incididunt ut labore et dolore magna aliqua. Ut
+;; enim ad minim veniam, quis nostrud exercitation ullamco laboris
+;; nisi ut.
+=-=
+;; Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do
+;; eiusmod tempor.  Incididunt ut labore et dolore magna aliqua. Ut
+;; enim ad minim veniam, quis nostrud exercitation ullamco laboris
+;; nisi ut.
+
+;; 	Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed
+;; 	do eiusmod tempor.
+;; 	Incididunt ut labore et dolore magna aliqua. Ut enim ad minim
+;; 	veniam, quis nostrud exercitation ullamco laboris nisi ut.
+
+;; Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do
+;; eiusmod tempor.  Incididunt ut labore et dolore magna aliqua. Ut
+;; enim ad minim veniam, quis nostrud exercitation ullamco laboris
+;; nisi ut.
+=-=-=
diff --git a/test/lisp/textmodes/fill-resources/semlf-fill-column.erts b/test/lisp/textmodes/fill-resources/semlf-fill-column.erts
new file mode 100644
index 000000000000..20db7b1f9c5b
--- /dev/null
+++ b/test/lisp/textmodes/fill-resources/semlf-fill-column.erts
@@ -0,0 +1,15 @@
+Name: fill-column
+
+=-=
+Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do
+eiusmod tempor.  Incididunt ut labore et dolore magna aliqua. Ut enim
+ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut.
+=-=
+Lorem ipsum dolor sit amet,
+consectetur adipiscing elit, sed do
+eiusmod tempor.
+Incididunt ut labore et dolore
+magna aliqua. Ut enim ad minim
+veniam, quis nostrud exercitation
+ullamco laboris nisi ut.
+=-=-=
diff --git a/test/lisp/textmodes/fill-resources/semlf-fill-paragraph-function.erts b/test/lisp/textmodes/fill-resources/semlf-fill-paragraph-function.erts
new file mode 100644
index 000000000000..467e7401cf50
--- /dev/null
+++ b/test/lisp/textmodes/fill-resources/semlf-fill-paragraph-function.erts
@@ -0,0 +1,12 @@
+Name: fill-paragraph-function
+
+=-=
+Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do
+eiusmod tempor.  Incididunt ut labore et dolore magna aliqua. Ut enim
+ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut.
+=-=
+Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do
+eiusmod tempor.
+Incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam,
+quis nostrud exercitation ullamco laboris nisi ut.
+=-=-=
diff --git a/test/lisp/textmodes/fill-resources/semlf-fill-prefix.erts b/test/lisp/textmodes/fill-resources/semlf-fill-prefix.erts
new file mode 100644
index 000000000000..e067eff69701
--- /dev/null
+++ b/test/lisp/textmodes/fill-resources/semlf-fill-prefix.erts
@@ -0,0 +1,35 @@
+Name: fill-prefix - marker
+
+=-=
+- Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor.  Incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut.
+- Aliquip ex ea commodo consequat.  Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur.
+- Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.
+=-=
+- Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do
+- eiusmod tempor.
+- Incididunt ut labore et dolore magna aliqua. Ut enim ad minim
+- veniam, quis nostrud exercitation ullamco laboris nisi ut.
+- Aliquip ex ea commodo consequat.
+- Duis aute irure dolor in reprehenderit in voluptate velit esse
+- cillum dolore eu fugiat nulla pariatur.
+- Excepteur sint occaecat cupidatat non proident, sunt in culpa qui
+- officia deserunt mollit anim id est laborum.
+=-=-=
+
+Name: fill-prefix - whitespace
+
+=-=
+- Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor.  Incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut.
+  Aliquip ex ea commodo consequat.  Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur.
+  Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.
+=-=
+- Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do
+  eiusmod tempor.
+  Incididunt ut labore et dolore magna aliqua. Ut enim ad minim
+  veniam, quis nostrud exercitation ullamco laboris nisi ut.
+  Aliquip ex ea commodo consequat.
+  Duis aute irure dolor in reprehenderit in voluptate velit esse
+  cillum dolore eu fugiat nulla pariatur.
+  Excepteur sint occaecat cupidatat non proident, sunt in culpa qui
+  officia deserunt mollit anim id est laborum.
+=-=-=
diff --git a/test/lisp/textmodes/fill-resources/semlf-fill-region-as-paragraph.erts b/test/lisp/textmodes/fill-resources/semlf-fill-region-as-paragraph.erts
new file mode 100644
index 000000000000..114eaa46fc3c
--- /dev/null
+++ b/test/lisp/textmodes/fill-resources/semlf-fill-region-as-paragraph.erts
@@ -0,0 +1,37 @@
+Point-Char: |
+
+Name: fill-region-as-paragraph-semlf
+
+=-=
+Lorem ipsum dolor sit amet, consectetur adipiscing elit, s|ed do
+eiusmod tempor.  Incididunt ut labore et dolore magna aliqua. Ut enim
+ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut.
+
+Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do
+eiusmod tempor.  Incididunt ut labore et dolore magna aliqua. Ut enim
+ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut.
+
+Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do
+eiusmod tempor.  Incididunt ut labore et dolore magna aliqua. Ut enim
+ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut.
+=-=
+Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed
+do eiusmod tempor.
+Incididunt ut labore et dolore
+magna aliqua. Ut enim ad minim
+veniam, quis nostrud exercitation
+ullamco laboris nisi ut.
+Lorem ipsum dolor sit amet,
+consectetur adipiscing elit, sed do
+eiusmod tempor.
+Incididunt ut labore et dolore
+magna aliqua. Ut enim ad minim
+veniam, quis nostrud exercitation
+ullamco laboris nisi ut.
+Lorem ipsum dolor sit amet,
+consectetur adipiscing elit, sed do
+eiusmod tempor.
+Incididunt ut labore et dolore
+magna aliqua. Ut enim
+ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut.
+=-=-=
diff --git a/test/lisp/textmodes/fill-resources/semlf-indented-block.erts b/test/lisp/textmodes/fill-resources/semlf-indented-block.erts
new file mode 100644
index 000000000000..e483567c6ab3
--- /dev/null
+++ b/test/lisp/textmodes/fill-resources/semlf-indented-block.erts
@@ -0,0 +1,31 @@
+Point-Char: |
+
+Name: indented block
+
+=-=
+Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do
+eiusmod tempor.  Incididunt ut labore et dolore magna aliqua. Ut enim
+ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut.
+
+	|Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed
+	do eiusmod tempor.  Incididunt ut labore et dolore magna
+	aliqua. Ut enim ad minim veniam, quis nostrud exercitation
+	ullamco laboris nisi ut.
+
+Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do
+eiusmod tempor.  Incididunt ut labore et dolore magna aliqua. Ut enim
+ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut.
+=-=
+Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do
+eiusmod tempor.  Incididunt ut labore et dolore magna aliqua. Ut enim
+ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut.
+
+	Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed
+	do eiusmod tempor.
+	Incididunt ut labore et dolore magna aliqua. Ut enim ad minim
+	veniam, quis nostrud exercitation ullamco laboris nisi ut.
+
+Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do
+eiusmod tempor.  Incididunt ut labore et dolore magna aliqua. Ut enim
+ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut.
+=-=-=
diff --git a/test/lisp/textmodes/fill-resources/semlf-justify.erts b/test/lisp/textmodes/fill-resources/semlf-justify.erts
new file mode 100644
index 000000000000..3a951b7ce424
--- /dev/null
+++ b/test/lisp/textmodes/fill-resources/semlf-justify.erts
@@ -0,0 +1,12 @@
+Name: justify
+
+=-=
+Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do
+eiusmod tempor.  Incididunt ut labore et dolore magna aliqua. Ut enim
+ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut.
+=-=
+Lorem  ipsum  dolor sit  amet,  consectetur  adipiscing elit,  sed  do
+eiusmod tempor.
+Incididunt ut labore et dolore magna  aliqua. Ut enim ad minim veniam,
+quis nostrud exercitation ullamco laboris nisi ut.
+=-=-=
diff --git a/test/lisp/textmodes/fill-resources/semlf-markdown-mode.erts b/test/lisp/textmodes/fill-resources/semlf-markdown-mode.erts
new file mode 100644
index 000000000000..7257708c245d
--- /dev/null
+++ b/test/lisp/textmodes/fill-resources/semlf-markdown-mode.erts
@@ -0,0 +1,129 @@
+Point-Char: |
+
+Name: markdown-mode
+
+=-=
+Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do
+eiusmod tempor.  Incididunt ut labore et dolore magna aliqua. Ut enim
+ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut.
+=-=
+Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do
+eiusmod tempor.
+Incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam,
+quis nostrud exercitation ullamco laboris nisi ut.
+=-=-=
+
+Name: markdown-mode - list - one single-line item
+
+=-=
+- Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor.  Incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut.
+=-=
+- Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do
+  eiusmod tempor.
+  Incididunt ut labore et dolore magna aliqua. Ut enim ad minim
+  veniam, quis nostrud exercitation ullamco laboris nisi ut.
+=-=-=
+
+Name: markdown-mode - list - multiple single-line items
+
+=-=
+- Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor.  Incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut.
+- Aliquip ex ea commodo consequat.  Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur.
+- Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.
+=-=
+- Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do
+  eiusmod tempor.
+  Incididunt ut labore et dolore magna aliqua. Ut enim ad minim
+  veniam, quis nostrud exercitation ullamco laboris nisi ut.
+- Aliquip ex ea commodo consequat.  Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur.
+- Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.
+=-=-=
+
+Name: markdown-mode - list - one multi-line item
+
+=-=
+- Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do
+  eiusmod tempor.  Incididunt ut labore et dolore magna aliqua. Ut
+  enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi
+  ut.
+=-=
+- Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do
+  eiusmod tempor.
+  Incididunt ut labore et dolore magna aliqua. Ut enim ad minim
+  veniam, quis nostrud exercitation ullamco laboris nisi ut.
+=-=-=
+
+Name: markdown-mode - list - multiple multi-line items
+
+=-=
+- Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do
+  eiusmod tempor.  Incididunt ut labore et dolore magn a aliqua. Ut
+  enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi
+  ut.
+- Aliquip ex ea commodo consequat.  Duis aute irure dolor in
+  reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla
+  pariatur.
+- Excepteur sint occaecat cupidatat non proident, sunt in culpa qui
+  officia deserunt mollit anim id est laborum.
+=-=
+- Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do
+  eiusmod tempor.
+  Incididunt ut labore et dolore magn a aliqua. Ut enim ad minim
+  veniam, quis nostrud exercitation ullamco laboris nisi ut.
+- Aliquip ex ea commodo consequat.  Duis aute irure dolor in
+  reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla
+  pariatur.
+- Excepteur sint occaecat cupidatat non proident, sunt in culpa qui
+  officia deserunt mollit anim id est laborum.
+=-=-=
+
+Name: markdown-mode - list - short sentence in multi-line item
+
+=-=
+- Lorem ipsum dolor.  Sit amet, consectetur adipiscing elit, sed do
+  eiusmod tempor.  Incididunt ut labore et dolore magn a aliqua. Ut
+  enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi
+  ut.
+=-=
+- Lorem ipsum dolor.
+  Sit amet, consectetur adipiscing elit, sed do eiusmod tempor.
+  Incididunt ut labore et dolore magn a aliqua. Ut enim ad minim
+  veniam, quis nostrud exercitation ullamco laboris nisi ut.
+=-=-=
+
+Name: markdown-mode - indented block
+Skip: t
+
+TODO - In `markdown-mode', the `fill-forward-paragraph' function
+ignores code blocks.  We should reach out to the `markdown-mode'
+maintainer(s) to understand the reason for this and possibly suggest a
+change to this behavior.  This works as expected in
+`markdown-ts-mode'.
+
+=-=
+Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do
+eiusmod tempor.  Incididunt ut labore et dolore magna aliqua. Ut enim
+ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut.
+
+	|Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed
+	do eiusmod tempor.  Incididunt ut labore et dolore magna
+	aliqua. Ut enim ad minim veniam, quis nostrud exercitation
+	ullamco laboris nisi ut.
+
+Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do
+eiusmod tempor.  Incididunt ut labore et dolore magna aliqua. Ut enim
+ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut.
+=-=
+Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do
+eiusmod tempor.  Incididunt ut labore et dolore magna aliqua. Ut enim
+ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut.
+
+	Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed
+	do eiusmod tempor.
+	Incididunt ut labore et dolore magna aliqua. Ut enim ad minim
+	veniam, quis nostrud exercitation ullamco laboris nisi ut.
+
+Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do
+eiusmod tempor.  Incididunt ut labore et dolore magna aliqua. Ut enim
+ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut.
+=-=-=
diff --git a/test/lisp/textmodes/fill-resources/semlf-org-mode.erts b/test/lisp/textmodes/fill-resources/semlf-org-mode.erts
new file mode 100644
index 000000000000..81dd4841de94
--- /dev/null
+++ b/test/lisp/textmodes/fill-resources/semlf-org-mode.erts
@@ -0,0 +1,122 @@
+Point-Char: |
+
+Name: org-mode
+
+=-=
+Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do
+eiusmod tempor.  Incididunt ut labore et dolore magna aliqua. Ut enim
+ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut.
+=-=
+Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do
+eiusmod tempor.
+Incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam,
+quis nostrud exercitation ullamco laboris nisi ut.
+=-=-=
+
+Name: org-mode - list - one single-line item
+
+=-=
+- Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor.  Incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut.
+=-=
+- Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do
+  eiusmod tempor.
+  Incididunt ut labore et dolore magna aliqua. Ut enim ad minim
+  veniam, quis nostrud exercitation ullamco laboris nisi ut.
+=-=-=
+
+Name: org-mode - list - multiple single-line items
+
+=-=
+- Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor.  Incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut.
+- Aliquip ex ea commodo consequat.  Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur.
+- Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.
+=-=
+- Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do
+  eiusmod tempor.
+  Incididunt ut labore et dolore magna aliqua. Ut enim ad minim
+  veniam, quis nostrud exercitation ullamco laboris nisi ut.
+- Aliquip ex ea commodo consequat.  Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur.
+- Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.
+=-=-=
+
+Name: org-mode - list - one multi-line item
+
+=-=
+- Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do
+  eiusmod tempor.  Incididunt ut labore et dolore magna aliqua. Ut
+  enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi
+  ut.
+=-=
+- Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do
+  eiusmod tempor.
+  Incididunt ut labore et dolore magna aliqua. Ut enim ad minim
+  veniam, quis nostrud exercitation ullamco laboris nisi ut.
+=-=-=
+
+Name: org-mode - list - multiple multi-line items
+
+=-=
+- Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do
+  eiusmod tempor.  Incididunt ut labore et dolore magn a aliqua. Ut
+  enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi
+  ut.
+- Aliquip ex ea commodo consequat.  Duis aute irure dolor in
+  reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla
+  pariatur.
+- Excepteur sint occaecat cupidatat non proident, sunt in culpa qui
+  officia deserunt mollit anim id est laborum.
+=-=
+- Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do
+  eiusmod tempor.
+  Incididunt ut labore et dolore magn a aliqua. Ut enim ad minim
+  veniam, quis nostrud exercitation ullamco laboris nisi ut.
+- Aliquip ex ea commodo consequat.  Duis aute irure dolor in
+  reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla
+  pariatur.
+- Excepteur sint occaecat cupidatat non proident, sunt in culpa qui
+  officia deserunt mollit anim id est laborum.
+=-=-=
+
+Name: org-mode - list - short sentence in multi-line item
+
+=-=
+- Lorem ipsum dolor.  Sit amet, consectetur adipiscing elit, sed do
+  eiusmod tempor.  Incididunt ut labore et dolore magn a aliqua. Ut
+  enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi
+  ut.
+=-=
+- Lorem ipsum dolor.
+  Sit amet, consectetur adipiscing elit, sed do eiusmod tempor.
+  Incididunt ut labore et dolore magn a aliqua. Ut enim ad minim
+  veniam, quis nostrud exercitation ullamco laboris nisi ut.
+=-=-=
+
+Name: org-mode - indented block
+
+=-=
+Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do
+eiusmod tempor.  Incididunt ut labore et dolore magna aliqua. Ut enim
+ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut.
+
+	|Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed
+	do eiusmod tempor.  Incididunt ut labore et dolore magna
+	aliqua. Ut enim ad minim veniam, quis nostrud exercitation
+	ullamco laboris nisi ut.
+
+Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do
+eiusmod tempor.  Incididunt ut labore et dolore magna aliqua. Ut enim
+ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut.
+=-=
+Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do
+eiusmod tempor.  Incididunt ut labore et dolore magna aliqua. Ut enim
+ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut.
+
+	Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed
+	do eiusmod tempor.
+	Incididunt ut labore et dolore magna aliqua. Ut enim ad minim
+	veniam, quis nostrud exercitation ullamco laboris nisi ut.
+
+Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do
+eiusmod tempor.  Incididunt ut labore et dolore magna aliqua. Ut enim
+ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut.
+=-=-=
diff --git a/test/lisp/textmodes/fill-resources/semlf-punctuation-marks.erts b/test/lisp/textmodes/fill-resources/semlf-punctuation-marks.erts
new file mode 100644
index 000000000000..5346216e9f9c
--- /dev/null
+++ b/test/lisp/textmodes/fill-resources/semlf-punctuation-marks.erts
@@ -0,0 +1,13 @@
+Name: punctuation marks
+
+=-=
+Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do
+eiusmod tempor.  Incididunt ut labore et dolore magna aliqua!  Ut enim
+ad minim veniam?  Quis nostrud exercitation ullamco laboris nisi ut.
+=-=
+Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do
+eiusmod tempor.
+Incididunt ut labore et dolore magna aliqua!
+Ut enim ad minim veniam?
+Quis nostrud exercitation ullamco laboris nisi ut.
+=-=-=
diff --git a/test/lisp/textmodes/fill-resources/semlf-revert.erts b/test/lisp/textmodes/fill-resources/semlf-revert.erts
new file mode 100644
index 000000000000..d3efca50de6d
--- /dev/null
+++ b/test/lisp/textmodes/fill-resources/semlf-revert.erts
@@ -0,0 +1,11 @@
+Name: revert
+
+=-=
+Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do
+eiusmod tempor.  Incididunt ut labore et dolore magna aliqua. Ut enim
+ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut.
+=-=
+Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do
+eiusmod tempor.  Incididunt ut labore et dolore magna aliqua. Ut enim
+ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut.
+=-=-=
diff --git a/test/lisp/textmodes/fill-resources/semlf-sentence-end-double-space.erts b/test/lisp/textmodes/fill-resources/semlf-sentence-end-double-space.erts
new file mode 100644
index 000000000000..a01beed0f665
--- /dev/null
+++ b/test/lisp/textmodes/fill-resources/semlf-sentence-end-double-space.erts
@@ -0,0 +1,13 @@
+Name: sentence-end-double-space
+
+=-=
+Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do
+eiusmod tempor.  Incididunt ut labore et dolore magna aliqua. Ut enim
+ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut.
+=-=
+Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do
+eiusmod tempor.
+Incididunt ut labore et dolore magna aliqua.
+Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris
+nisi ut.
+=-=-=
diff --git a/test/lisp/textmodes/fill-resources/semlf-twice.erts b/test/lisp/textmodes/fill-resources/semlf-twice.erts
new file mode 100644
index 000000000000..862dda6e27eb
--- /dev/null
+++ b/test/lisp/textmodes/fill-resources/semlf-twice.erts
@@ -0,0 +1,12 @@
+Name: fill twice
+
+=-=
+Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do
+eiusmod tempor.  Incididunt ut labore et dolore magna aliqua. Ut enim
+ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut.
+=-=
+Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do
+eiusmod tempor.
+Incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam,
+quis nostrud exercitation ullamco laboris nisi ut.
+=-=-=
diff --git a/test/lisp/textmodes/fill-resources/semlf.erts b/test/lisp/textmodes/fill-resources/semlf.erts
new file mode 100644
index 000000000000..f3e331cd9381
--- /dev/null
+++ b/test/lisp/textmodes/fill-resources/semlf.erts
@@ -0,0 +1,88 @@
+Point-Char: |
+
+Name: beginning of buffer
+
+=-=
+|Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do
+eiusmod tempor.  Incididunt ut labore et dolore magna aliqua. Ut enim
+ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut.
+
+Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do
+eiusmod tempor.  Incididunt ut labore et dolore magna aliqua. Ut enim
+ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut.
+
+Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do
+eiusmod tempor.  Incididunt ut labore et dolore magna aliqua. Ut enim
+ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut.
+=-=
+Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do
+eiusmod tempor.
+Incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam,
+quis nostrud exercitation ullamco laboris nisi ut.
+
+Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do
+eiusmod tempor.  Incididunt ut labore et dolore magna aliqua. Ut enim
+ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut.
+
+Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do
+eiusmod tempor.  Incididunt ut labore et dolore magna aliqua. Ut enim
+ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut.
+=-=-=
+
+Name: second paragraph
+
+=-=
+Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do
+eiusmod tempor.  Incididunt ut labore et dolore magna aliqua. Ut enim
+ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut.
+
+|Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do
+eiusmod tempor.  Incididunt ut labore et dolore magna aliqua. Ut enim
+ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut.
+
+Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do
+eiusmod tempor.  Incididunt ut labore et dolore magna aliqua. Ut enim
+ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut.
+=-=
+Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do
+eiusmod tempor.  Incididunt ut labore et dolore magna aliqua. Ut enim
+ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut.
+
+Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do
+eiusmod tempor.
+Incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam,
+quis nostrud exercitation ullamco laboris nisi ut.
+
+Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do
+eiusmod tempor.  Incididunt ut labore et dolore magna aliqua. Ut enim
+ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut.
+=-=-=
+
+Name: end of buffer
+
+=-=
+Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do
+eiusmod tempor.  Incididunt ut labore et dolore magna aliqua. Ut enim
+ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut.
+
+Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do
+eiusmod tempor.  Incididunt ut labore et dolore magna aliqua. Ut enim
+ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut.
+
+Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do
+eiusmod tempor.  Incididunt ut labore et dolore magna aliqua. Ut enim
+ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut.|
+=-=
+Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do
+eiusmod tempor.  Incididunt ut labore et dolore magna aliqua. Ut enim
+ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut.
+
+Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do
+eiusmod tempor.  Incididunt ut labore et dolore magna aliqua. Ut enim
+ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut.
+
+Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do
+eiusmod tempor.
+Incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam,
+quis nostrud exercitation ullamco laboris nisi ut.
+=-=-=
diff --git a/test/lisp/textmodes/fill-tests.el b/test/lisp/textmodes/fill-tests.el
index 6e079973100e..8fbd9919bad0 100644
--- a/test/lisp/textmodes/fill-tests.el
+++ b/test/lisp/textmodes/fill-tests.el
@@ -28,6 +28,7 @@
 ;;; Code:
 
 (require 'ert)
+(require 'ert-x)
 
 (ert-deftest fill-test-no-fill-polish-nobreak-p nil
   "Tests of the `fill-polish-nobreak-p' function."
@@ -121,6 +122,117 @@ test-fill-haskell
   ;; w
 ")))
 
+
+(ert-deftest fill-test-fill-region-as-paragraph-semlf ()
+  "Test the `fill-region-as-paragraph-semlf' function."
+  (ert-test-erts-file (ert-resource-file "semlf-fill-region-as-paragraph.erts")
+                      (lambda ()
+			(setq-local fill-column 35)
+			(fill-region-as-paragraph-semlf
+                         (point)
+                         (progn
+                           (goto-char (point-max))
+                           (forward-line -1)
+                           (beginning-of-line)
+                           (point))))))
+
+(ert-deftest fill-test-fill-paragraph-semlf ()
+  "Test the `fill-paragraph-semlf' function."
+  (ert-test-erts-file (ert-resource-file "semlf.erts")
+                      (lambda ()
+			(fill-paragraph-semlf))))
+
+(ert-deftest fill-test-fill-paragraph-semlf-fill-paragraph-function ()
+  "Test `fill-paragraph-semlf' as `fill-paragraph-function'."
+  (ert-test-erts-file (ert-resource-file "semlf-fill-paragraph-function.erts")
+                      (lambda ()
+			(setq-local fill-paragraph-function #'fill-paragraph-semlf)
+			(fill-paragraph))))
+
+(ert-deftest fill-test-fill-paragraph-semlf-justify ()
+  "Test the JUSTIFY parameter of the `fill-paragraph-semlf' function."
+  (ert-test-erts-file (ert-resource-file "semlf-justify.erts")
+                      (lambda ()
+			(fill-paragraph-semlf 'justify))))
+
+(ert-deftest fill-test-fill-paragraph-semlf-sentence-end-double-space ()
+  "Test the `fill-paragraph-semlf' function with `sentence-end-double-space'."
+  (ert-test-erts-file (ert-resource-file "semlf-sentence-end-double-space.erts")
+                      (lambda ()
+			(setq-local sentence-end-double-space nil)
+			(fill-paragraph-semlf))))
+
+(ert-deftest fill-test-fill-paragraph-semlf-fill-column ()
+  "Test the `fill-paragraph-semlf' function with `fill-column'."
+  (ert-test-erts-file (ert-resource-file "semlf-fill-column.erts")
+                      (lambda ()
+			(setq-local fill-column 35)
+			(fill-paragraph-semlf))))
+
+(ert-deftest fill-test-fill-paragraph-semlf-punctuation-marks ()
+  "Test the `fill-paragraph-semlf' function with different punctuation marks."
+  (ert-test-erts-file (ert-resource-file "semlf-punctuation-marks.erts")
+                      (lambda ()
+			(fill-paragraph-semlf))))
+
+(ert-deftest fill-test-fill-paragraph-semlf-twice ()
+  "Test to run the `fill-paragraph-semlf' function twice."
+  (ert-test-erts-file (ert-resource-file "semlf-twice.erts")
+                      (lambda ()
+			(goto-char (point-min))
+			(fill-paragraph-semlf)
+			(goto-char (point-min))
+			(fill-paragraph-semlf))))
+
+(ert-deftest fill-test-fill-paragraph-semlf-fill-prefix ()
+  "Test the `fill-paragraph-semlf' function with different fill prefixes."
+  (ert-test-erts-file (ert-resource-file "semlf-fill-prefix.erts")
+                      (lambda ()
+			(fill-paragraph-semlf))))
+
+(ert-deftest fill-test-fill-paragraph-semlf-indented-block ()
+  "Test the `fill-paragraph-semlf' function with an indented block."
+  (ert-test-erts-file (ert-resource-file "semlf-indented-block.erts")
+                      (lambda ()
+			(fill-paragraph-semlf))))
+
+(ert-deftest fill-test-fill-paragraph-semlf-revert ()
+  "Test that the `fill-paragraph-semlf' function can be reverted."
+  (ert-test-erts-file (ert-resource-file "semlf-revert.erts")
+                      (lambda ()
+                        (fill-paragraph)
+			(fill-paragraph-semlf)
+                        (fill-paragraph))))
+
+(ert-deftest fill-test-fill-paragraph-semlf-emacs-lisp-mode ()
+  "Test the `fill-paragraph-semlf' function with `emacs-lisp-mode'."
+  (ert-test-erts-file (ert-resource-file "semlf-emacs-lisp-mode.erts")
+                      (lambda ()
+			(emacs-lisp-mode)
+			(fill-paragraph-semlf))))
+
+(ert-deftest fill-test-fill-paragraph-semlf-c-mode ()
+  "Test the `fill-paragraph-semlf' function with `c-mode'."
+  (ert-test-erts-file (ert-resource-file "semlf-c-mode.erts")
+                      (lambda ()
+			(c-mode)
+			(fill-paragraph-semlf))))
+
+(ert-deftest fill-test-fill-paragraph-semlf-org-mode ()
+  "Test the `fill-paragraph-semlf' function with `org-mode'."
+  (ert-test-erts-file (ert-resource-file "semlf-org-mode.erts")
+                      (lambda ()
+			(org-mode)
+			(fill-paragraph-semlf))))
+
+(ert-deftest fill-test-fill-paragraph-semlf-markdown-mode ()
+  "Test the `fill-paragraph-semlf' function with `markdown-mode'."
+  (skip-unless (functionp 'markdown-mode))
+  (ert-test-erts-file (ert-resource-file "semlf-markdown-mode.erts")
+                      (lambda ()
+			(markdown-mode)
+			(fill-paragraph-semlf))))
+
 (provide 'fill-tests)
 
 ;;; fill-tests.el ends here
-- 
2.49.0


--=-=-=--

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To: Stefan Monnier <monnier@HIDDEN>
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Subject: Re: bug#78561: [PATCH] Add semantic linefeed support for paragraph
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> From: Stefan Monnier <monnier@HIDDEN>
> Cc: Eli Zaretskii <eliz@HIDDEN>,  78561 <at> debbugs.gnu.org,  Marcin Borkowski
>  <mbork@HIDDEN>
> Date: Sat, 31 May 2025 13:39:52 -0400
> 
> >> I recommend you first finish the current patch and take on that
> >> plan afterwards.
> >> What I'm asking is a fairly small refactoring of the code you sent,
> >> I think.
> >
> > Please, find attached a new version of the patch.
> 
> Looks good to me.  Eli?

It's okay, but please make sure there are two spaces between
sentences, not one.  There are quite a few cases in the patch where
this is not so.

Also, the commit log message should mention the bug number.

Thanks.

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>> I recommend you first finish the current patch and take on that
>> plan afterwards.
>> What I'm asking is a fairly small refactoring of the code you sent,
>> I think.
>
> Please, find attached a new version of the patch.

Looks good to me.  Eli?

> - Remove the mention about using `fill-paragraph-semlf' as
>   `fill-paragraph-function' from docs, given that the long term plan is
>   to obsolete this.

Well, it's been in my TODO for ages, so maybe we shouldn't assume this
long term plan will materialize soon.


        Stefan

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--=-=-=
Content-Type: text/plain

Stefan Monnier <monnier@HIDDEN> writes:

> I recommend you first finish the current patch and take on that
> plan afterwards.
> What I'm asking is a fairly small refactoring of the code you sent,
> I think.

Please, find attached a new version of the patch.

It contains the following changes:

- Add a new function named `fill-region-as-paragraph-semlf', which fills
  a region using semantic linefeeds as if it were a single paragraph.
  Its behavior is analogous to `fill-region-as-paragraph'.
- Update the `fill-paragraph-semlf' function to use
  `fill-region-as-paragraph-semlf' internally.
- Remove the mention about using `fill-paragraph-semlf' as
  `fill-paragraph-function' from docs, given that the long term plan is
  to obsolete this.
- Add test for `fill-region-as-paragraph-semlf'.

Thanks a lot for all the explanations.  I hope this new version is
closer to what you had in mind.

        Roi


--=-=-=
Content-Type: text/x-patch
Content-Disposition: attachment;
 filename=0001-Add-semantic-linefeed-support-for-paragraph-filling.patch

From 92538223e4808a46d47de57be4e85b3773f1fc8b Mon Sep 17 00:00:00 2001
From: Roi Martin <jroi.martin@HIDDEN>
Date: Fri, 21 Mar 2025 14:22:46 +0100
Subject: [PATCH] Add semantic linefeed support for paragraph filling

* lisp/textmodes/fill.el (fill-region-as-paragraph-semlf): Add function
to fill a region using semantic linefeeds as if it were a single
paragraph.
(fill-paragraph-semlf): Add function to fill paragraph using semantic
linefeeds.
* test/lisp/textmodes/fill-tests.el
(fill-test-fill-region-as-paragraph-semlf)
(fill-test-fill-paragraph-semlf)
(fill-test-fill-paragraph-semlf-fill-paragraph-function)
(fill-test-fill-paragraph-semlf-justify)
(fill-test-fill-paragraph-semlf-sentence-end-double-space)
(fill-test-fill-paragraph-semlf-fill-column)
(fill-test-fill-paragraph-semlf-punctuation-marks)
(fill-test-fill-paragraph-semlf-twice)
(fill-test-fill-paragraph-semlf-fill-prefix)
(fill-test-fill-paragraph-semlf-indented-block)
(fill-test-fill-paragraph-semlf-emacs-lisp-mode)
(fill-test-fill-paragraph-semlf-c-mode)
(fill-test-fill-paragraph-semlf-org-mode)
(fill-test-fill-paragraph-semlf-markdown-mode): Add tests.
* test/lisp/textmodes/fill-resources/semlf-c-mode.erts:
* test/lisp/textmodes/fill-resources/semlf-emacs-lisp-mode.erts:
* test/lisp/textmodes/fill-resources/semlf-fill-column.erts:
* test/lisp/textmodes/fill-resources/semlf-fill-paragraph-function.erts:
* test/lisp/textmodes/fill-resources/semlf-fill-prefix.erts:
* test/lisp/textmodes/fill-resources/semlf-fill-region-as-paragraph.erts:
* test/lisp/textmodes/fill-resources/semlf-indented-block.erts:
* test/lisp/textmodes/fill-resources/semlf-justify.erts:
* test/lisp/textmodes/fill-resources/semlf-markdown-mode.erts:
* test/lisp/textmodes/fill-resources/semlf-org-mode.erts:
* test/lisp/textmodes/fill-resources/semlf-punctuation-marks.erts:
* test/lisp/textmodes/fill-resources/semlf-sentence-end-double-space.erts:
* test/lisp/textmodes/fill-resources/semlf-twice.erts:
* test/lisp/textmodes/fill-resources/semlf.erts: Add test data.
---
 lisp/textmodes/fill.el                        |  92 +++++++++
 .../fill-resources/semlf-c-mode.erts          | 183 ++++++++++++++++++
 .../fill-resources/semlf-emacs-lisp-mode.erts |  87 +++++++++
 .../fill-resources/semlf-fill-column.erts     |  15 ++
 .../semlf-fill-paragraph-function.erts        |  12 ++
 .../fill-resources/semlf-fill-prefix.erts     |  35 ++++
 .../semlf-fill-region-as-paragraph.erts       |  37 ++++
 .../fill-resources/semlf-indented-block.erts  |  31 +++
 .../fill-resources/semlf-justify.erts         |  12 ++
 .../fill-resources/semlf-markdown-mode.erts   | 129 ++++++++++++
 .../fill-resources/semlf-org-mode.erts        | 122 ++++++++++++
 .../semlf-punctuation-marks.erts              |  13 ++
 .../semlf-sentence-end-double-space.erts      |  13 ++
 .../textmodes/fill-resources/semlf-twice.erts |  12 ++
 test/lisp/textmodes/fill-resources/semlf.erts |  88 +++++++++
 test/lisp/textmodes/fill-tests.el             | 104 ++++++++++
 16 files changed, 985 insertions(+)
 create mode 100644 test/lisp/textmodes/fill-resources/semlf-c-mode.erts
 create mode 100644 test/lisp/textmodes/fill-resources/semlf-emacs-lisp-mode.erts
 create mode 100644 test/lisp/textmodes/fill-resources/semlf-fill-column.erts
 create mode 100644 test/lisp/textmodes/fill-resources/semlf-fill-paragraph-function.erts
 create mode 100644 test/lisp/textmodes/fill-resources/semlf-fill-prefix.erts
 create mode 100644 test/lisp/textmodes/fill-resources/semlf-fill-region-as-paragraph.erts
 create mode 100644 test/lisp/textmodes/fill-resources/semlf-indented-block.erts
 create mode 100644 test/lisp/textmodes/fill-resources/semlf-justify.erts
 create mode 100644 test/lisp/textmodes/fill-resources/semlf-markdown-mode.erts
 create mode 100644 test/lisp/textmodes/fill-resources/semlf-org-mode.erts
 create mode 100644 test/lisp/textmodes/fill-resources/semlf-punctuation-marks.erts
 create mode 100644 test/lisp/textmodes/fill-resources/semlf-sentence-end-double-space.erts
 create mode 100644 test/lisp/textmodes/fill-resources/semlf-twice.erts
 create mode 100644 test/lisp/textmodes/fill-resources/semlf.erts

diff --git a/lisp/textmodes/fill.el b/lisp/textmodes/fill.el
index e38d030734fb..b457b01d6917 100644
--- a/lisp/textmodes/fill.el
+++ b/lisp/textmodes/fill.el
@@ -1583,4 +1583,96 @@ fill-individual-paragraphs-citation
 	"")
     string))
 
+(defun fill-region-as-paragraph-semlf (from to &optional justify
+                                            nosqueeze squeeze-after)
+  "Fill the region using semantic linefeeds as if it were a single paragraph.
+This command removes any paragraph breaks in the region and extra
+newlines at the end, and fills lines within the region. It leaves point
+at the beginning of the line following the region.
+
+If JUSTIFY is non-nil (interactively, with prefix argument), justify as
+well.  If NOSQUEEZE is non-nil, do not to make spaces between words
+canonical before filling.  SQUEEZE-AFTER, if non-nil, should be a buffer
+position; it means canonicalize spaces only starting from that position.
+See `canonically-space-region' for the meaning of canonicalization of
+spaces.
+
+Return the `fill-prefix' used for filling.
+
+If `sentence-end-double-space' is non-nil, then period followed by one
+space does not end a sentence, so don't break a line there.
+The variable `fill-column' controls the width for filling.
+
+For more details about semantic linefeeds, see `fill-paragraph-semlf'."
+  (interactive (progn
+		 (barf-if-buffer-read-only)
+		 (list (region-beginning)
+                       (region-end)
+		       (if current-prefix-arg 'full))))
+  (unless (memq justify '(t nil none full center left right))
+    (setq justify 'full))
+
+  (let ((from (min from to))
+        (to (max from to))
+        pfx)
+    (goto-char from)
+    (with-restriction (line-beginning-position) to
+      (let ((fill-column (point-max)))
+        (setq pfx (or (save-excursion
+                        (fill-region-as-paragraph (point)
+                                                  (point-max)
+                                                  nil
+                                                  nosqueeze
+                                                  squeeze-after))
+                      "")))
+      (while (not (eobp))
+        (let ((fill-prefix pfx))
+	  (fill-region-as-paragraph (point)
+				    (progn (forward-sentence) (point))
+				    justify
+                                    nosqueeze
+                                    squeeze-after))
+        (when (and (> (point) (line-beginning-position))
+		   (< (point) (line-end-position)))
+	  (delete-horizontal-space)
+	  (insert "\n")
+	  (insert pfx))))
+    (unless (eobp) (forward-char 1))
+    pfx))
+
+(defun fill-paragraph-semlf (&optional justify)
+  "Fill paragraph at or after point using semantic linefeeds.
+This command ensures that a newline character follows every sentence.
+If a sentence is not followed by a newline character, one is inserted.
+The task of deciding what is considered a sentence is delegated to the
+`forward-sentence' function.
+
+If JUSTIFY is non-nil (interactively, with prefix argument), justify as
+well.  If `sentence-end-double-space' is non-nil, then period followed
+by one space does not end a sentence, so don't break a line there.
+The variable `fill-column' controls the width for filling.
+
+Return the `fill-prefix' used for filling.
+
+For more details about semantic linefeeds, see `https://sembr.org/' and
+`https://rhodesmill.org/brandon/2012/one-sentence-per-line/'."
+  (interactive (progn
+		 (barf-if-buffer-read-only)
+		 (list (if current-prefix-arg 'full))))
+  (unless (memq justify '(t nil none full center left right))
+    (setq justify 'full))
+
+  (save-excursion
+    (let ((to (progn
+		(fill-forward-paragraph 1)
+		(backward-word)
+		(end-of-line)
+		(point)))
+	  (from (progn
+		  (fill-forward-paragraph -1)
+		  (forward-word)
+		  (beginning-of-line)
+		  (point))))
+      (fill-region-as-paragraph-semlf from to justify))))
+
 ;;; fill.el ends here
diff --git a/test/lisp/textmodes/fill-resources/semlf-c-mode.erts b/test/lisp/textmodes/fill-resources/semlf-c-mode.erts
new file mode 100644
index 000000000000..a28eb68cfc6a
--- /dev/null
+++ b/test/lisp/textmodes/fill-resources/semlf-c-mode.erts
@@ -0,0 +1,183 @@
+Point-Char: |
+
+Name: c-mode - single-line
+
+=-=
+// Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do
+// eiusmod tempor.  Incididunt ut labore et dolore magna aliqua. Ut enim
+// ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut.
+=-=
+// Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do
+// eiusmod tempor.
+// Incididunt ut labore et dolore magna aliqua. Ut enim ad minim
+// veniam, quis nostrud exercitation ullamco laboris nisi ut.
+=-=-=
+
+Name: c-mode - single-line - fill-prefix - marker
+
+=-=
+// - Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor.  Incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut.
+// - Aliquip ex ea commodo consequat.  Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur.
+// - Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.
+=-=
+// - Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do
+// - eiusmod tempor.
+// - Incididunt ut labore et dolore magna aliqua. Ut enim ad minim
+// - veniam, quis nostrud exercitation ullamco laboris nisi ut.
+// - Aliquip ex ea commodo consequat.
+// - Duis aute irure dolor in reprehenderit in voluptate velit esse
+// - cillum dolore eu fugiat nulla pariatur.
+// - Excepteur sint occaecat cupidatat non proident, sunt in culpa qui
+// - officia deserunt mollit anim id est laborum.
+=-=-=
+
+Name: c-mode - single-line - fill-prefix - whitespace
+
+=-=
+// - Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor.  Incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut.
+//   Aliquip ex ea commodo consequat.  Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur.
+//   Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.
+=-=
+// - Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do
+//   eiusmod tempor.
+//   Incididunt ut labore et dolore magna aliqua. Ut enim ad minim
+//   veniam, quis nostrud exercitation ullamco laboris nisi ut.
+//   Aliquip ex ea commodo consequat.
+//   Duis aute irure dolor in reprehenderit in voluptate velit esse
+//   cillum dolore eu fugiat nulla pariatur.
+//   Excepteur sint occaecat cupidatat non proident, sunt in culpa qui
+//   officia deserunt mollit anim id est laborum.
+=-=-=
+
+Name: c-mode - single-line - indented block
+
+=-=
+// Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do
+// eiusmod tempor.  Incididunt ut labore et dolore magna aliqua. Ut
+// enim ad minim veniam, quis nostrud exercitation ullamco laboris
+// nisi ut.
+//
+// 	|Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed
+// 	do eiusmod tempor.  Incididunt ut labore et dolore magna
+// 	aliqua. Ut enim ad minim veniam, quis nostrud exercitation
+// 	ullamco laboris nisi ut.
+//
+// Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do
+// eiusmod tempor.  Incididunt ut labore et dolore magna aliqua. Ut
+// enim ad minim veniam, quis nostrud exercitation ullamco laboris
+// nisi ut.
+=-=
+// Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do
+// eiusmod tempor.  Incididunt ut labore et dolore magna aliqua. Ut
+// enim ad minim veniam, quis nostrud exercitation ullamco laboris
+// nisi ut.
+//
+// 	Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed
+// 	do eiusmod tempor.
+// 	Incididunt ut labore et dolore magna aliqua. Ut enim ad minim
+// 	veniam, quis nostrud exercitation ullamco laboris nisi ut.
+//
+// Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do
+// eiusmod tempor.  Incididunt ut labore et dolore magna aliqua. Ut
+// enim ad minim veniam, quis nostrud exercitation ullamco laboris
+// nisi ut.
+=-=-=
+
+Name: c-mode - multi-line
+
+=-=
+/*
+ * Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do
+ * eiusmod tempor.  Incididunt ut labore et dolore magna aliqua. Ut enim
+ * ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut.
+ */
+=-=
+/*
+ * Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do
+ * eiusmod tempor.
+ * Incididunt ut labore et dolore magna aliqua. Ut enim ad minim
+ * veniam, quis nostrud exercitation ullamco laboris nisi ut.
+ */
+=-=-=
+
+Name: c-mode - multi-line - fill-prefix - marker
+
+=-=
+/*
+ * - Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor.  Incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut.
+ * - Aliquip ex ea commodo consequat.  Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur.
+ * - Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.
+ */
+=-=
+/*
+ * - Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do
+ * - eiusmod tempor.
+ * - Incididunt ut labore et dolore magna aliqua. Ut enim ad minim
+ * - veniam, quis nostrud exercitation ullamco laboris nisi ut.
+ * - Aliquip ex ea commodo consequat.
+ * - Duis aute irure dolor in reprehenderit in voluptate velit esse
+ * - cillum dolore eu fugiat nulla pariatur.
+ * - Excepteur sint occaecat cupidatat non proident, sunt in culpa qui
+ * - officia deserunt mollit anim id est laborum.
+ */
+=-=-=
+
+Name: c-mode - multi-line - fill-prefix - whitespace
+
+=-=
+/*
+ * - Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor.  Incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut.
+ *   Aliquip ex ea commodo consequat.  Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur.
+ *   Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.
+ */
+=-=
+/*
+ * - Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do
+ *   eiusmod tempor.
+ *   Incididunt ut labore et dolore magna aliqua. Ut enim ad minim
+ *   veniam, quis nostrud exercitation ullamco laboris nisi ut.
+ *   Aliquip ex ea commodo consequat.
+ *   Duis aute irure dolor in reprehenderit in voluptate velit esse
+ *   cillum dolore eu fugiat nulla pariatur.
+ *   Excepteur sint occaecat cupidatat non proident, sunt in culpa qui
+ *   officia deserunt mollit anim id est laborum.
+ */
+=-=-=
+
+Name: c-mode - multi-line - indented block
+
+=-=
+/*
+ * Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do
+ * eiusmod tempor.  Incididunt ut labore et dolore magna aliqua. Ut
+ * enim ad minim veniam, quis nostrud exercitation ullamco laboris
+ * nisi ut.
+ *
+ * 	|Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed
+ * 	do eiusmod tempor.  Incididunt ut labore et dolore magna
+ * 	aliqua. Ut enim ad minim veniam, quis nostrud exercitation
+ * 	ullamco laboris nisi ut.
+ *
+ * Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do
+ * eiusmod tempor.  Incididunt ut labore et dolore magna aliqua. Ut
+ * enim ad minim veniam, quis nostrud exercitation ullamco laboris
+ * nisi ut.
+ */
+=-=
+/*
+ * Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do
+ * eiusmod tempor.  Incididunt ut labore et dolore magna aliqua. Ut
+ * enim ad minim veniam, quis nostrud exercitation ullamco laboris
+ * nisi ut.
+ *
+ * 	Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed
+ * 	do eiusmod tempor.
+ * 	Incididunt ut labore et dolore magna aliqua. Ut enim ad minim
+ * 	veniam, quis nostrud exercitation ullamco laboris nisi ut.
+ *
+ * Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do
+ * eiusmod tempor.  Incididunt ut labore et dolore magna aliqua. Ut
+ * enim ad minim veniam, quis nostrud exercitation ullamco laboris
+ * nisi ut.
+ */
+=-=-=
diff --git a/test/lisp/textmodes/fill-resources/semlf-emacs-lisp-mode.erts b/test/lisp/textmodes/fill-resources/semlf-emacs-lisp-mode.erts
new file mode 100644
index 000000000000..fe71ee32c1aa
--- /dev/null
+++ b/test/lisp/textmodes/fill-resources/semlf-emacs-lisp-mode.erts
@@ -0,0 +1,87 @@
+Point-Char: |
+
+Name: emacs-lisp-mode
+
+=-=
+;; Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do
+;; eiusmod tempor.  Incididunt ut labore et dolore magna aliqua. Ut enim
+;; ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut.
+=-=
+;; Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do
+;; eiusmod tempor.
+;; Incididunt ut labore et dolore magna aliqua. Ut enim ad minim
+;; veniam, quis nostrud exercitation ullamco laboris nisi ut.
+=-=-=
+
+Name: emacs-lisp-mode - fill-prefix - marker
+
+=-=
+;; - Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor.  Incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut.
+;; - Aliquip ex ea commodo consequat.  Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur.
+;; - Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.
+=-=
+;; - Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do
+;; - eiusmod tempor.
+;; - Incididunt ut labore et dolore magna aliqua. Ut enim ad minim
+;; - veniam, quis nostrud exercitation ullamco laboris nisi ut.
+;; - Aliquip ex ea commodo consequat.
+;; - Duis aute irure dolor in reprehenderit in voluptate velit esse
+;; - cillum dolore eu fugiat nulla pariatur.
+;; - Excepteur sint occaecat cupidatat non proident, sunt in culpa qui
+;; - officia deserunt mollit anim id est laborum.
+=-=-=
+
+Name: emacs-lisp-mode - fill-prefix - whitespace
+
+=-=
+;; - Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor.  Incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut.
+;;   Aliquip ex ea commodo consequat.  Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur.
+;;   Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.
+=-=
+;; - Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do
+;;   eiusmod tempor.
+;;   Incididunt ut labore et dolore magna aliqua. Ut enim ad minim
+;;   veniam, quis nostrud exercitation ullamco laboris nisi ut.
+;;   Aliquip ex ea commodo consequat.
+;;   Duis aute irure dolor in reprehenderit in voluptate velit esse
+;;   cillum dolore eu fugiat nulla pariatur.
+;;   Excepteur sint occaecat cupidatat non proident, sunt in culpa qui
+;;   officia deserunt mollit anim id est laborum.
+=-=-=
+
+Name: emacs-lisp-mode - indented block
+
+The `fill-forward-paragraph' function jumps to the beginning/end of
+the comment.
+
+=-=
+;; Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do
+;; eiusmod tempor.  Incididunt ut labore et dolore magna aliqua. Ut
+;; enim ad minim veniam, quis nostrud exercitation ullamco laboris
+;; nisi ut.
+
+;; 	|Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed
+;; 	do eiusmod tempor.  Incididunt ut labore et dolore magna
+;; 	aliqua. Ut enim ad minim veniam, quis nostrud exercitation
+;; 	ullamco laboris nisi ut.
+
+;; Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do
+;; eiusmod tempor.  Incididunt ut labore et dolore magna aliqua. Ut
+;; enim ad minim veniam, quis nostrud exercitation ullamco laboris
+;; nisi ut.
+=-=
+;; Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do
+;; eiusmod tempor.  Incididunt ut labore et dolore magna aliqua. Ut
+;; enim ad minim veniam, quis nostrud exercitation ullamco laboris
+;; nisi ut.
+
+;; 	Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed
+;; 	do eiusmod tempor.
+;; 	Incididunt ut labore et dolore magna aliqua. Ut enim ad minim
+;; 	veniam, quis nostrud exercitation ullamco laboris nisi ut.
+
+;; Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do
+;; eiusmod tempor.  Incididunt ut labore et dolore magna aliqua. Ut
+;; enim ad minim veniam, quis nostrud exercitation ullamco laboris
+;; nisi ut.
+=-=-=
diff --git a/test/lisp/textmodes/fill-resources/semlf-fill-column.erts b/test/lisp/textmodes/fill-resources/semlf-fill-column.erts
new file mode 100644
index 000000000000..20db7b1f9c5b
--- /dev/null
+++ b/test/lisp/textmodes/fill-resources/semlf-fill-column.erts
@@ -0,0 +1,15 @@
+Name: fill-column
+
+=-=
+Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do
+eiusmod tempor.  Incididunt ut labore et dolore magna aliqua. Ut enim
+ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut.
+=-=
+Lorem ipsum dolor sit amet,
+consectetur adipiscing elit, sed do
+eiusmod tempor.
+Incididunt ut labore et dolore
+magna aliqua. Ut enim ad minim
+veniam, quis nostrud exercitation
+ullamco laboris nisi ut.
+=-=-=
diff --git a/test/lisp/textmodes/fill-resources/semlf-fill-paragraph-function.erts b/test/lisp/textmodes/fill-resources/semlf-fill-paragraph-function.erts
new file mode 100644
index 000000000000..467e7401cf50
--- /dev/null
+++ b/test/lisp/textmodes/fill-resources/semlf-fill-paragraph-function.erts
@@ -0,0 +1,12 @@
+Name: fill-paragraph-function
+
+=-=
+Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do
+eiusmod tempor.  Incididunt ut labore et dolore magna aliqua. Ut enim
+ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut.
+=-=
+Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do
+eiusmod tempor.
+Incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam,
+quis nostrud exercitation ullamco laboris nisi ut.
+=-=-=
diff --git a/test/lisp/textmodes/fill-resources/semlf-fill-prefix.erts b/test/lisp/textmodes/fill-resources/semlf-fill-prefix.erts
new file mode 100644
index 000000000000..e067eff69701
--- /dev/null
+++ b/test/lisp/textmodes/fill-resources/semlf-fill-prefix.erts
@@ -0,0 +1,35 @@
+Name: fill-prefix - marker
+
+=-=
+- Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor.  Incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut.
+- Aliquip ex ea commodo consequat.  Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur.
+- Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.
+=-=
+- Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do
+- eiusmod tempor.
+- Incididunt ut labore et dolore magna aliqua. Ut enim ad minim
+- veniam, quis nostrud exercitation ullamco laboris nisi ut.
+- Aliquip ex ea commodo consequat.
+- Duis aute irure dolor in reprehenderit in voluptate velit esse
+- cillum dolore eu fugiat nulla pariatur.
+- Excepteur sint occaecat cupidatat non proident, sunt in culpa qui
+- officia deserunt mollit anim id est laborum.
+=-=-=
+
+Name: fill-prefix - whitespace
+
+=-=
+- Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor.  Incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut.
+  Aliquip ex ea commodo consequat.  Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur.
+  Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.
+=-=
+- Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do
+  eiusmod tempor.
+  Incididunt ut labore et dolore magna aliqua. Ut enim ad minim
+  veniam, quis nostrud exercitation ullamco laboris nisi ut.
+  Aliquip ex ea commodo consequat.
+  Duis aute irure dolor in reprehenderit in voluptate velit esse
+  cillum dolore eu fugiat nulla pariatur.
+  Excepteur sint occaecat cupidatat non proident, sunt in culpa qui
+  officia deserunt mollit anim id est laborum.
+=-=-=
diff --git a/test/lisp/textmodes/fill-resources/semlf-fill-region-as-paragraph.erts b/test/lisp/textmodes/fill-resources/semlf-fill-region-as-paragraph.erts
new file mode 100644
index 000000000000..114eaa46fc3c
--- /dev/null
+++ b/test/lisp/textmodes/fill-resources/semlf-fill-region-as-paragraph.erts
@@ -0,0 +1,37 @@
+Point-Char: |
+
+Name: fill-region-as-paragraph-semlf
+
+=-=
+Lorem ipsum dolor sit amet, consectetur adipiscing elit, s|ed do
+eiusmod tempor.  Incididunt ut labore et dolore magna aliqua. Ut enim
+ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut.
+
+Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do
+eiusmod tempor.  Incididunt ut labore et dolore magna aliqua. Ut enim
+ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut.
+
+Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do
+eiusmod tempor.  Incididunt ut labore et dolore magna aliqua. Ut enim
+ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut.
+=-=
+Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed
+do eiusmod tempor.
+Incididunt ut labore et dolore
+magna aliqua. Ut enim ad minim
+veniam, quis nostrud exercitation
+ullamco laboris nisi ut.
+Lorem ipsum dolor sit amet,
+consectetur adipiscing elit, sed do
+eiusmod tempor.
+Incididunt ut labore et dolore
+magna aliqua. Ut enim ad minim
+veniam, quis nostrud exercitation
+ullamco laboris nisi ut.
+Lorem ipsum dolor sit amet,
+consectetur adipiscing elit, sed do
+eiusmod tempor.
+Incididunt ut labore et dolore
+magna aliqua. Ut enim
+ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut.
+=-=-=
diff --git a/test/lisp/textmodes/fill-resources/semlf-indented-block.erts b/test/lisp/textmodes/fill-resources/semlf-indented-block.erts
new file mode 100644
index 000000000000..e483567c6ab3
--- /dev/null
+++ b/test/lisp/textmodes/fill-resources/semlf-indented-block.erts
@@ -0,0 +1,31 @@
+Point-Char: |
+
+Name: indented block
+
+=-=
+Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do
+eiusmod tempor.  Incididunt ut labore et dolore magna aliqua. Ut enim
+ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut.
+
+	|Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed
+	do eiusmod tempor.  Incididunt ut labore et dolore magna
+	aliqua. Ut enim ad minim veniam, quis nostrud exercitation
+	ullamco laboris nisi ut.
+
+Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do
+eiusmod tempor.  Incididunt ut labore et dolore magna aliqua. Ut enim
+ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut.
+=-=
+Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do
+eiusmod tempor.  Incididunt ut labore et dolore magna aliqua. Ut enim
+ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut.
+
+	Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed
+	do eiusmod tempor.
+	Incididunt ut labore et dolore magna aliqua. Ut enim ad minim
+	veniam, quis nostrud exercitation ullamco laboris nisi ut.
+
+Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do
+eiusmod tempor.  Incididunt ut labore et dolore magna aliqua. Ut enim
+ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut.
+=-=-=
diff --git a/test/lisp/textmodes/fill-resources/semlf-justify.erts b/test/lisp/textmodes/fill-resources/semlf-justify.erts
new file mode 100644
index 000000000000..3a951b7ce424
--- /dev/null
+++ b/test/lisp/textmodes/fill-resources/semlf-justify.erts
@@ -0,0 +1,12 @@
+Name: justify
+
+=-=
+Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do
+eiusmod tempor.  Incididunt ut labore et dolore magna aliqua. Ut enim
+ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut.
+=-=
+Lorem  ipsum  dolor sit  amet,  consectetur  adipiscing elit,  sed  do
+eiusmod tempor.
+Incididunt ut labore et dolore magna  aliqua. Ut enim ad minim veniam,
+quis nostrud exercitation ullamco laboris nisi ut.
+=-=-=
diff --git a/test/lisp/textmodes/fill-resources/semlf-markdown-mode.erts b/test/lisp/textmodes/fill-resources/semlf-markdown-mode.erts
new file mode 100644
index 000000000000..7257708c245d
--- /dev/null
+++ b/test/lisp/textmodes/fill-resources/semlf-markdown-mode.erts
@@ -0,0 +1,129 @@
+Point-Char: |
+
+Name: markdown-mode
+
+=-=
+Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do
+eiusmod tempor.  Incididunt ut labore et dolore magna aliqua. Ut enim
+ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut.
+=-=
+Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do
+eiusmod tempor.
+Incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam,
+quis nostrud exercitation ullamco laboris nisi ut.
+=-=-=
+
+Name: markdown-mode - list - one single-line item
+
+=-=
+- Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor.  Incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut.
+=-=
+- Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do
+  eiusmod tempor.
+  Incididunt ut labore et dolore magna aliqua. Ut enim ad minim
+  veniam, quis nostrud exercitation ullamco laboris nisi ut.
+=-=-=
+
+Name: markdown-mode - list - multiple single-line items
+
+=-=
+- Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor.  Incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut.
+- Aliquip ex ea commodo consequat.  Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur.
+- Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.
+=-=
+- Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do
+  eiusmod tempor.
+  Incididunt ut labore et dolore magna aliqua. Ut enim ad minim
+  veniam, quis nostrud exercitation ullamco laboris nisi ut.
+- Aliquip ex ea commodo consequat.  Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur.
+- Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.
+=-=-=
+
+Name: markdown-mode - list - one multi-line item
+
+=-=
+- Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do
+  eiusmod tempor.  Incididunt ut labore et dolore magna aliqua. Ut
+  enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi
+  ut.
+=-=
+- Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do
+  eiusmod tempor.
+  Incididunt ut labore et dolore magna aliqua. Ut enim ad minim
+  veniam, quis nostrud exercitation ullamco laboris nisi ut.
+=-=-=
+
+Name: markdown-mode - list - multiple multi-line items
+
+=-=
+- Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do
+  eiusmod tempor.  Incididunt ut labore et dolore magn a aliqua. Ut
+  enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi
+  ut.
+- Aliquip ex ea commodo consequat.  Duis aute irure dolor in
+  reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla
+  pariatur.
+- Excepteur sint occaecat cupidatat non proident, sunt in culpa qui
+  officia deserunt mollit anim id est laborum.
+=-=
+- Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do
+  eiusmod tempor.
+  Incididunt ut labore et dolore magn a aliqua. Ut enim ad minim
+  veniam, quis nostrud exercitation ullamco laboris nisi ut.
+- Aliquip ex ea commodo consequat.  Duis aute irure dolor in
+  reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla
+  pariatur.
+- Excepteur sint occaecat cupidatat non proident, sunt in culpa qui
+  officia deserunt mollit anim id est laborum.
+=-=-=
+
+Name: markdown-mode - list - short sentence in multi-line item
+
+=-=
+- Lorem ipsum dolor.  Sit amet, consectetur adipiscing elit, sed do
+  eiusmod tempor.  Incididunt ut labore et dolore magn a aliqua. Ut
+  enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi
+  ut.
+=-=
+- Lorem ipsum dolor.
+  Sit amet, consectetur adipiscing elit, sed do eiusmod tempor.
+  Incididunt ut labore et dolore magn a aliqua. Ut enim ad minim
+  veniam, quis nostrud exercitation ullamco laboris nisi ut.
+=-=-=
+
+Name: markdown-mode - indented block
+Skip: t
+
+TODO - In `markdown-mode', the `fill-forward-paragraph' function
+ignores code blocks.  We should reach out to the `markdown-mode'
+maintainer(s) to understand the reason for this and possibly suggest a
+change to this behavior.  This works as expected in
+`markdown-ts-mode'.
+
+=-=
+Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do
+eiusmod tempor.  Incididunt ut labore et dolore magna aliqua. Ut enim
+ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut.
+
+	|Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed
+	do eiusmod tempor.  Incididunt ut labore et dolore magna
+	aliqua. Ut enim ad minim veniam, quis nostrud exercitation
+	ullamco laboris nisi ut.
+
+Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do
+eiusmod tempor.  Incididunt ut labore et dolore magna aliqua. Ut enim
+ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut.
+=-=
+Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do
+eiusmod tempor.  Incididunt ut labore et dolore magna aliqua. Ut enim
+ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut.
+
+	Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed
+	do eiusmod tempor.
+	Incididunt ut labore et dolore magna aliqua. Ut enim ad minim
+	veniam, quis nostrud exercitation ullamco laboris nisi ut.
+
+Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do
+eiusmod tempor.  Incididunt ut labore et dolore magna aliqua. Ut enim
+ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut.
+=-=-=
diff --git a/test/lisp/textmodes/fill-resources/semlf-org-mode.erts b/test/lisp/textmodes/fill-resources/semlf-org-mode.erts
new file mode 100644
index 000000000000..81dd4841de94
--- /dev/null
+++ b/test/lisp/textmodes/fill-resources/semlf-org-mode.erts
@@ -0,0 +1,122 @@
+Point-Char: |
+
+Name: org-mode
+
+=-=
+Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do
+eiusmod tempor.  Incididunt ut labore et dolore magna aliqua. Ut enim
+ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut.
+=-=
+Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do
+eiusmod tempor.
+Incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam,
+quis nostrud exercitation ullamco laboris nisi ut.
+=-=-=
+
+Name: org-mode - list - one single-line item
+
+=-=
+- Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor.  Incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut.
+=-=
+- Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do
+  eiusmod tempor.
+  Incididunt ut labore et dolore magna aliqua. Ut enim ad minim
+  veniam, quis nostrud exercitation ullamco laboris nisi ut.
+=-=-=
+
+Name: org-mode - list - multiple single-line items
+
+=-=
+- Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor.  Incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut.
+- Aliquip ex ea commodo consequat.  Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur.
+- Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.
+=-=
+- Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do
+  eiusmod tempor.
+  Incididunt ut labore et dolore magna aliqua. Ut enim ad minim
+  veniam, quis nostrud exercitation ullamco laboris nisi ut.
+- Aliquip ex ea commodo consequat.  Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur.
+- Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.
+=-=-=
+
+Name: org-mode - list - one multi-line item
+
+=-=
+- Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do
+  eiusmod tempor.  Incididunt ut labore et dolore magna aliqua. Ut
+  enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi
+  ut.
+=-=
+- Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do
+  eiusmod tempor.
+  Incididunt ut labore et dolore magna aliqua. Ut enim ad minim
+  veniam, quis nostrud exercitation ullamco laboris nisi ut.
+=-=-=
+
+Name: org-mode - list - multiple multi-line items
+
+=-=
+- Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do
+  eiusmod tempor.  Incididunt ut labore et dolore magn a aliqua. Ut
+  enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi
+  ut.
+- Aliquip ex ea commodo consequat.  Duis aute irure dolor in
+  reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla
+  pariatur.
+- Excepteur sint occaecat cupidatat non proident, sunt in culpa qui
+  officia deserunt mollit anim id est laborum.
+=-=
+- Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do
+  eiusmod tempor.
+  Incididunt ut labore et dolore magn a aliqua. Ut enim ad minim
+  veniam, quis nostrud exercitation ullamco laboris nisi ut.
+- Aliquip ex ea commodo consequat.  Duis aute irure dolor in
+  reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla
+  pariatur.
+- Excepteur sint occaecat cupidatat non proident, sunt in culpa qui
+  officia deserunt mollit anim id est laborum.
+=-=-=
+
+Name: org-mode - list - short sentence in multi-line item
+
+=-=
+- Lorem ipsum dolor.  Sit amet, consectetur adipiscing elit, sed do
+  eiusmod tempor.  Incididunt ut labore et dolore magn a aliqua. Ut
+  enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi
+  ut.
+=-=
+- Lorem ipsum dolor.
+  Sit amet, consectetur adipiscing elit, sed do eiusmod tempor.
+  Incididunt ut labore et dolore magn a aliqua. Ut enim ad minim
+  veniam, quis nostrud exercitation ullamco laboris nisi ut.
+=-=-=
+
+Name: org-mode - indented block
+
+=-=
+Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do
+eiusmod tempor.  Incididunt ut labore et dolore magna aliqua. Ut enim
+ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut.
+
+	|Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed
+	do eiusmod tempor.  Incididunt ut labore et dolore magna
+	aliqua. Ut enim ad minim veniam, quis nostrud exercitation
+	ullamco laboris nisi ut.
+
+Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do
+eiusmod tempor.  Incididunt ut labore et dolore magna aliqua. Ut enim
+ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut.
+=-=
+Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do
+eiusmod tempor.  Incididunt ut labore et dolore magna aliqua. Ut enim
+ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut.
+
+	Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed
+	do eiusmod tempor.
+	Incididunt ut labore et dolore magna aliqua. Ut enim ad minim
+	veniam, quis nostrud exercitation ullamco laboris nisi ut.
+
+Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do
+eiusmod tempor.  Incididunt ut labore et dolore magna aliqua. Ut enim
+ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut.
+=-=-=
diff --git a/test/lisp/textmodes/fill-resources/semlf-punctuation-marks.erts b/test/lisp/textmodes/fill-resources/semlf-punctuation-marks.erts
new file mode 100644
index 000000000000..5346216e9f9c
--- /dev/null
+++ b/test/lisp/textmodes/fill-resources/semlf-punctuation-marks.erts
@@ -0,0 +1,13 @@
+Name: punctuation marks
+
+=-=
+Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do
+eiusmod tempor.  Incididunt ut labore et dolore magna aliqua!  Ut enim
+ad minim veniam?  Quis nostrud exercitation ullamco laboris nisi ut.
+=-=
+Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do
+eiusmod tempor.
+Incididunt ut labore et dolore magna aliqua!
+Ut enim ad minim veniam?
+Quis nostrud exercitation ullamco laboris nisi ut.
+=-=-=
diff --git a/test/lisp/textmodes/fill-resources/semlf-sentence-end-double-space.erts b/test/lisp/textmodes/fill-resources/semlf-sentence-end-double-space.erts
new file mode 100644
index 000000000000..a01beed0f665
--- /dev/null
+++ b/test/lisp/textmodes/fill-resources/semlf-sentence-end-double-space.erts
@@ -0,0 +1,13 @@
+Name: sentence-end-double-space
+
+=-=
+Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do
+eiusmod tempor.  Incididunt ut labore et dolore magna aliqua. Ut enim
+ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut.
+=-=
+Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do
+eiusmod tempor.
+Incididunt ut labore et dolore magna aliqua.
+Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris
+nisi ut.
+=-=-=
diff --git a/test/lisp/textmodes/fill-resources/semlf-twice.erts b/test/lisp/textmodes/fill-resources/semlf-twice.erts
new file mode 100644
index 000000000000..862dda6e27eb
--- /dev/null
+++ b/test/lisp/textmodes/fill-resources/semlf-twice.erts
@@ -0,0 +1,12 @@
+Name: fill twice
+
+=-=
+Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do
+eiusmod tempor.  Incididunt ut labore et dolore magna aliqua. Ut enim
+ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut.
+=-=
+Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do
+eiusmod tempor.
+Incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam,
+quis nostrud exercitation ullamco laboris nisi ut.
+=-=-=
diff --git a/test/lisp/textmodes/fill-resources/semlf.erts b/test/lisp/textmodes/fill-resources/semlf.erts
new file mode 100644
index 000000000000..f3e331cd9381
--- /dev/null
+++ b/test/lisp/textmodes/fill-resources/semlf.erts
@@ -0,0 +1,88 @@
+Point-Char: |
+
+Name: beginning of buffer
+
+=-=
+|Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do
+eiusmod tempor.  Incididunt ut labore et dolore magna aliqua. Ut enim
+ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut.
+
+Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do
+eiusmod tempor.  Incididunt ut labore et dolore magna aliqua. Ut enim
+ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut.
+
+Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do
+eiusmod tempor.  Incididunt ut labore et dolore magna aliqua. Ut enim
+ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut.
+=-=
+Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do
+eiusmod tempor.
+Incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam,
+quis nostrud exercitation ullamco laboris nisi ut.
+
+Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do
+eiusmod tempor.  Incididunt ut labore et dolore magna aliqua. Ut enim
+ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut.
+
+Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do
+eiusmod tempor.  Incididunt ut labore et dolore magna aliqua. Ut enim
+ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut.
+=-=-=
+
+Name: second paragraph
+
+=-=
+Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do
+eiusmod tempor.  Incididunt ut labore et dolore magna aliqua. Ut enim
+ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut.
+
+|Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do
+eiusmod tempor.  Incididunt ut labore et dolore magna aliqua. Ut enim
+ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut.
+
+Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do
+eiusmod tempor.  Incididunt ut labore et dolore magna aliqua. Ut enim
+ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut.
+=-=
+Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do
+eiusmod tempor.  Incididunt ut labore et dolore magna aliqua. Ut enim
+ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut.
+
+Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do
+eiusmod tempor.
+Incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam,
+quis nostrud exercitation ullamco laboris nisi ut.
+
+Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do
+eiusmod tempor.  Incididunt ut labore et dolore magna aliqua. Ut enim
+ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut.
+=-=-=
+
+Name: end of buffer
+
+=-=
+Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do
+eiusmod tempor.  Incididunt ut labore et dolore magna aliqua. Ut enim
+ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut.
+
+Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do
+eiusmod tempor.  Incididunt ut labore et dolore magna aliqua. Ut enim
+ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut.
+
+Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do
+eiusmod tempor.  Incididunt ut labore et dolore magna aliqua. Ut enim
+ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut.|
+=-=
+Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do
+eiusmod tempor.  Incididunt ut labore et dolore magna aliqua. Ut enim
+ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut.
+
+Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do
+eiusmod tempor.  Incididunt ut labore et dolore magna aliqua. Ut enim
+ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut.
+
+Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do
+eiusmod tempor.
+Incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam,
+quis nostrud exercitation ullamco laboris nisi ut.
+=-=-=
diff --git a/test/lisp/textmodes/fill-tests.el b/test/lisp/textmodes/fill-tests.el
index 6e079973100e..1448965c9d46 100644
--- a/test/lisp/textmodes/fill-tests.el
+++ b/test/lisp/textmodes/fill-tests.el
@@ -28,6 +28,7 @@
 ;;; Code:
 
 (require 'ert)
+(require 'ert-x)
 
 (ert-deftest fill-test-no-fill-polish-nobreak-p nil
   "Tests of the `fill-polish-nobreak-p' function."
@@ -121,6 +122,109 @@ test-fill-haskell
   ;; w
 ")))
 
+
+(ert-deftest fill-test-fill-region-as-paragraph-semlf ()
+  "Test the `fill-region-as-paragraph-semlf' function."
+  (ert-test-erts-file (ert-resource-file "semlf-fill-region-as-paragraph.erts")
+                      (lambda ()
+			(setq-local fill-column 35)
+			(fill-region-as-paragraph-semlf
+                         (point)
+                         (progn
+                           (goto-char (point-max))
+                           (forward-line -1)
+                           (beginning-of-line)
+                           (point))))))
+
+(ert-deftest fill-test-fill-paragraph-semlf ()
+  "Test the `fill-paragraph-semlf' function."
+  (ert-test-erts-file (ert-resource-file "semlf.erts")
+                      (lambda ()
+			(fill-paragraph-semlf))))
+
+(ert-deftest fill-test-fill-paragraph-semlf-fill-paragraph-function ()
+  "Test `fill-paragraph-semlf' as `fill-paragraph-function'."
+  (ert-test-erts-file (ert-resource-file "semlf-fill-paragraph-function.erts")
+                      (lambda ()
+			(setq-local fill-paragraph-function #'fill-paragraph-semlf)
+			(fill-paragraph))))
+
+(ert-deftest fill-test-fill-paragraph-semlf-justify ()
+  "Test the JUSTIFY parameter of the `fill-paragraph-semlf' function."
+  (ert-test-erts-file (ert-resource-file "semlf-justify.erts")
+                      (lambda ()
+			(fill-paragraph-semlf 'justify))))
+
+(ert-deftest fill-test-fill-paragraph-semlf-sentence-end-double-space ()
+  "Test the `fill-paragraph-semlf' function with `sentence-end-double-space'."
+  (ert-test-erts-file (ert-resource-file "semlf-sentence-end-double-space.erts")
+                      (lambda ()
+			(setq-local sentence-end-double-space nil)
+			(fill-paragraph-semlf))))
+
+(ert-deftest fill-test-fill-paragraph-semlf-fill-column ()
+  "Test the `fill-paragraph-semlf' function with `fill-column'."
+  (ert-test-erts-file (ert-resource-file "semlf-fill-column.erts")
+                      (lambda ()
+			(setq-local fill-column 35)
+			(fill-paragraph-semlf))))
+
+(ert-deftest fill-test-fill-paragraph-semlf-punctuation-marks ()
+  "Test the `fill-paragraph-semlf' function with different punctuation marks."
+  (ert-test-erts-file (ert-resource-file "semlf-punctuation-marks.erts")
+                      (lambda ()
+			(fill-paragraph-semlf))))
+
+(ert-deftest fill-test-fill-paragraph-semlf-twice ()
+  "Test to run the `fill-paragraph-semlf' function twice."
+  (ert-test-erts-file (ert-resource-file "semlf-twice.erts")
+                      (lambda ()
+			(goto-char (point-min))
+			(fill-paragraph-semlf)
+			(goto-char (point-min))
+			(fill-paragraph-semlf))))
+
+(ert-deftest fill-test-fill-paragraph-semlf-fill-prefix ()
+  "Test the `fill-paragraph-semlf' function with different fill prefixes."
+  (ert-test-erts-file (ert-resource-file "semlf-fill-prefix.erts")
+                      (lambda ()
+			(fill-paragraph-semlf))))
+
+(ert-deftest fill-test-fill-paragraph-semlf-indented-block ()
+  "Test the `fill-paragraph-semlf' function with an indented block."
+  (ert-test-erts-file (ert-resource-file "semlf-indented-block.erts")
+                      (lambda ()
+			(fill-paragraph-semlf))))
+
+(ert-deftest fill-test-fill-paragraph-semlf-emacs-lisp-mode ()
+  "Test the `fill-paragraph-semlf' function with `emacs-lisp-mode'."
+  (ert-test-erts-file (ert-resource-file "semlf-emacs-lisp-mode.erts")
+                      (lambda ()
+			(emacs-lisp-mode)
+			(fill-paragraph-semlf))))
+
+(ert-deftest fill-test-fill-paragraph-semlf-c-mode ()
+  "Test the `fill-paragraph-semlf' function with `c-mode'."
+  (ert-test-erts-file (ert-resource-file "semlf-c-mode.erts")
+                      (lambda ()
+			(c-mode)
+			(fill-paragraph-semlf))))
+
+(ert-deftest fill-test-fill-paragraph-semlf-org-mode ()
+  "Test the `fill-paragraph-semlf' function with `org-mode'."
+  (ert-test-erts-file (ert-resource-file "semlf-org-mode.erts")
+                      (lambda ()
+			(org-mode)
+			(fill-paragraph-semlf))))
+
+(ert-deftest fill-test-fill-paragraph-semlf-markdown-mode ()
+  "Test the `fill-paragraph-semlf' function with `markdown-mode'."
+  (skip-unless (functionp 'markdown-mode))
+  (ert-test-erts-file (ert-resource-file "semlf-markdown-mode.erts")
+                      (lambda ()
+			(markdown-mode)
+			(fill-paragraph-semlf))))
+
 (provide 'fill-tests)
 
 ;;; fill-tests.el ends here
-- 
2.49.0


--=-=-=--

Information forwarded to bug-gnu-emacs@HIDDEN:
bug#78561; Package emacs. Full text available.

Message received at 78561 <at> debbugs.gnu.org:

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From: Stefan Monnier <monnier@HIDDEN>
To: Roi Martin <jroi.martin@HIDDEN>
Subject: Re: bug#78561: [PATCH] Add semantic linefeed support for paragraph
 filling
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>> Yes, I've had this in my TODO for many years.  =F0=9F=99=81
> I'll try to implement it :)

For some definition of "it".

>>> So, do we really want a specific `fill-region-semlf' function?
>> Actually, I think I want a `fill-region-as-paragraph-semlf'.
>> And maybe then some way to tell the `fill.el` code to use that instead
>> of the default `fill-region-as-paragraph`.
> OK, so here is my plan:

That plan has a much larger scope than semantic linefeed, so
I recommend you first finish the current patch and take on that
plan afterwards.
What I'm asking is a fairly small refactoring of the code you sent,
I think.

> First, I'll give a closer look to all the "fill" functions that Emacs
> currently provides to understand how every thing fits together and what
> is and what is not already supported.

Sounds good.  I can give you a quick summary of what I know.
`fill-paragraph-function`s usually serve as either:

- Some way for the major mode to teach the fill code how to stay within
  a major-mode-specific notion of paragraph (e.g. fill within comments
  or within strings).  This use has made somewhat obsolete by
  `fill-paragraph-forward-function` but it's still pretty common.

- Some way for the major mode to teach the fill code about special
  line-wrapping conventions (e.g. add a trailing \ on the previous line
  to fill C strings, add a leading SPC or TAB to fill rfc822 headers,
  ..) or to fine tune (adaptive-)fill-prefix.

- Actually change where we break lines for example to fill code in
  a "smart" way (like `smie-auto-fill` does).

- It can also be used to prevent filling in some parts
  (e.g. titles/headlines).

> Then, I'll send a new patch to support applying a
> `fill-paragraph-function' on a region "as-paragraph" (similar to the
> behavior of `fill-region-as-paragraph') and "per-paragraph" (similar to
> executing `fill-paragraph' for each paragraph within the region).

I think in general these are impossible because we don't know what the
`fill-paragraph-function` actually does.  My TODO is instead to provide
different hooks for the above different uses (some hooks already exist
such as `comment-line-break-function` but often they need to be
generalized) to try and make `fill-paragraph-function` effectively
obsolete (without necessarily marking it officially as obsolete).


        Stefan

Information forwarded to bug-gnu-emacs@HIDDEN:
bug#78561; Package emacs. Full text available.

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From: Roi Martin <jroi.martin@HIDDEN>
To: Stefan Monnier <monnier@HIDDEN>
Subject: Re: bug#78561: [PATCH] Add semantic linefeed support for paragraph
 filling
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Stefan Monnier <monnier@HIDDEN> writes:

>>> Please try and separate it into a `fill-region-semlf` function and then
>>> another one which applies it to a paragraph, so that it can also be used
>>> to fill a specific user-specified region (or the whole buffer).
>> I'm not sure about this one.  The idea is that `fill-paragraph-semlf'
>> can be assigned as a value for `fill-paragraph-function' (I also
>> included a mention to this in the doc string) or it can be called
>> directly.  The thing is that `fill-paragraph' docs say:
>
> Sadly, we don't currently have anything like a `fill-region-function`,
> but that's "a bug, not a feature", so we should write new code such that
> this misfeature is easier rather than harder to fix in the future.
>
>> I agree that it would be useful to apply `fill-paragraph-semlf' on
>> a region or the whole buffer.  But, the same could be said about any
>> other `fill-paragraph-function'.
>
> Yes, I've had this in my TODO for many years.  🙁

I'll try to implement it :)

>> So, do we really want a specific `fill-region-semlf' function?
>
> Actually, I think I want a `fill-region-as-paragraph-semlf'.
> And maybe then some way to tell the `fill.el` code to use that instead
> of the default `fill-region-as-paragraph`.

OK, so here is my plan:

First, I'll give a closer look to all the "fill" functions that Emacs
currently provides to understand how every thing fits together and what
is and what is not already supported.

Then, I'll send a new patch to support applying a
`fill-paragraph-function' on a region "as-paragraph" (similar to the
behavior of `fill-region-as-paragraph') and "per-paragraph" (similar to
executing `fill-paragraph' for each paragraph within the region).

Finally, if needed, I can update this patch.

Does it make sense?

Information forwarded to bug-gnu-emacs@HIDDEN:
bug#78561; Package emacs. Full text available.

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From: Stefan Monnier <monnier@HIDDEN>
To: Roi Martin <jroi.martin@HIDDEN>
Subject: Re: bug#78561: [PATCH] Add semantic linefeed support for paragraph
 filling
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>> Please try and separate it into a `fill-region-semlf` function and then
>> another one which applies it to a paragraph, so that it can also be used
>> to fill a specific user-specified region (or the whole buffer).
> I'm not sure about this one.  The idea is that `fill-paragraph-semlf'
> can be assigned as a value for `fill-paragraph-function' (I also
> included a mention to this in the doc string) or it can be called
> directly.  The thing is that `fill-paragraph' docs say:

Sadly, we don't currently have anything like a `fill-region-function`,
but that's "a bug, not a feature", so we should write new code such that
this misfeature is easier rather than harder to fix in the future.

> I agree that it would be useful to apply `fill-paragraph-semlf' on
> a region or the whole buffer.  But, the same could be said about any
> other `fill-paragraph-function'.

Yes, I've had this in my TODO for many years.  =F0=9F=99=81

> So, do we really want a specific `fill-region-semlf' function?

Actually, I think I want a `fill-region-as-paragraph-semlf'.
And maybe then some way to tell the `fill.el` code to use that instead
of the default `fill-region-as-paragraph`.


        Stefan

Information forwarded to bug-gnu-emacs@HIDDEN:
bug#78561; Package emacs. Full text available.

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From: Roi Martin <jroi.martin@HIDDEN>
To: Stefan Monnier <monnier@HIDDEN>, Eli Zaretskii <eliz@HIDDEN>
Subject: Re: bug#78561: [PATCH] Add semantic linefeed support for paragraph
 filling
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--=-=-=
Content-Type: text/plain; charset=utf-8
Content-Transfer-Encoding: 8bit

Stefan Monnier <monnier@HIDDEN> writes:

>> Given that this is a first version, I have not added any reference to
>> the manuals.  If you think it makes sense, please let me know and I'll
>> modify the patch accordingly.
>
> Maybe a short version of the explanation you give below would be good to
> have in the manual (tho Eli suggests a URL instead, so maybe that's
> good enough?).
>
>> +(defun fill-paragraph-semlf (&optional justify)
>> +  "Fill paragraph at or after point using semantic linefeeds.
>> +
>> +This function ensures that a newline character follows every
>> +sentence, as punctuated by a period (.), exclamation mark (!), or
>> +question mark (?).
>
> This seems inaccurate: it just uses whichever definition of sentence is
> used by `forward-sentence`, so it may ignore some of those chars or pay
> attention to others.

I have updated the patch with a more precise definition.  Also, I added
links to the sources I referenced for semantic linefeeds.

>> +If JUSTIFY is non-nil (interactively, with prefix argument), justify as
>> +well.  If `sentence-end-double-space' is non-nil, then period followed
>> +by one space does not end a sentence, so don't break a line there.  The
>> +variable `fill-column' controls the width for filling."
>
> I'd move the "The" to the last line.  🙂

Fixed :)

>> +  (interactive "P")
>> +  (save-excursion
>> +    (let ((end (progn
>> +		 (fill-forward-paragraph 1)
>> +		 (backward-word)
>> +		 (end-of-line)
>> +		 (point)))
>> +	  (start (progn
>> +		   (fill-forward-paragraph -1)
>> +		   (forward-word)
>> +		   (beginning-of-line)
>> +		   (point)))
>> +	  pfx)
>> +      (with-restriction start end
>> +	(let ((fill-column (point-max)))
>> +	  (setq pfx (or (fill-region-as-paragraph (point-min) (point-max)) "")))
>> +	(goto-char (point-min))
>> +	(while (not (eobp))
>> +	  (let ((fill-prefix pfx))
>> +	    (fill-region-as-paragraph (point)
>> +				      (progn (forward-sentence) (point))
>> +				      justify))
>> +	  (when (and (> (point) (line-beginning-position))
>> +		     (< (point) (line-end-position)))
>> +	    (delete-horizontal-space)
>> +	    (newline)
>> +	    (insert pfx))))))
>> +  t)
>
> Please try and separate it into a `fill-region-semlf` function and then
> another one which applies it to a paragraph, so that it can also be used
> to fill a specific user-specified region (or the whole buffer).

I'm not sure about this one.  The idea is that `fill-paragraph-semlf'
can be assigned as a value for `fill-paragraph-function' (I also
included a mention to this in the doc string) or it ca be called
directly.  The thing is that `fill-paragraph' docs say:

  The REGION argument is non-nil if called interactively; in that
  case, if Transient Mark mode is enabled and the mark is active,
  call `fill-region' to fill each of the paragraphs in the active
  region, instead of just filling the current paragraph.

And `fill-paragraph-function' docs say:

  Note: This only affects ‘fill-paragraph’ and not ‘fill-region’
  nor ‘auto-fill-mode’

So, if I'm not wrong, filling regions and paragraphs is different in the
current design.

I agree that it would be useful to apply `fill-paragraph-semlf' on a
region or the whole buffer.  But, the same could be said about any other
`fill-paragraph-function'.  So, do we really want a specific
`fill-region-semlf' function?

I attach a new version of the patch.

Thanks!


--=-=-=
Content-Type: text/x-patch
Content-Disposition: attachment;
 filename=0001-Add-semantic-linefeed-support-for-paragraph-filling.patch

From 9b8a28910a3da271afe32377926fd6cc2a9356ff Mon Sep 17 00:00:00 2001
From: Roi Martin <jroi.martin@HIDDEN>
Date: Fri, 21 Mar 2025 14:22:46 +0100
Subject: [PATCH] Add semantic linefeed support for paragraph filling

* lisp/textmodes/fill.el (fill-paragraph-semlf): Add function to fill
paragraph using semantic linefeeds.
* test/lisp/textmodes/fill-tests.el (fill-test-fill-paragraph-semlf)
(fill-test-fill-paragraph-semlf-fill-paragraph-function)
(fill-test-fill-paragraph-semlf-justify)
(fill-test-fill-paragraph-semlf-sentence-end-double-space)
(fill-test-fill-paragraph-semlf-fill-column)
(fill-test-fill-paragraph-semlf-punctuation-marks)
(fill-test-fill-paragraph-semlf-twice)
(fill-test-fill-paragraph-semlf-fill-prefix)
(fill-test-fill-paragraph-semlf-indented-block)
(fill-test-fill-paragraph-semlf-emacs-lisp-mode)
(fill-test-fill-paragraph-semlf-c-mode)
(fill-test-fill-paragraph-semlf-org-mode)
(fill-test-fill-paragraph-semlf-markdown-mode): Add tests.
* test/lisp/textmodes/fill-resources/semlf-c-mode.erts:
* test/lisp/textmodes/fill-resources/semlf-emacs-lisp-mode.erts:
* test/lisp/textmodes/fill-resources/semlf-fill-column.erts:
* test/lisp/textmodes/fill-resources/semlf-fill-paragraph-function.erts:
* test/lisp/textmodes/fill-resources/semlf-fill-prefix.erts:
* test/lisp/textmodes/fill-resources/semlf-indented-block.erts:
* test/lisp/textmodes/fill-resources/semlf-justify.erts:
* test/lisp/textmodes/fill-resources/semlf-markdown-mode.erts:
* test/lisp/textmodes/fill-resources/semlf-org-mode.erts:
* test/lisp/textmodes/fill-resources/semlf-punctuation-marks.erts:
* test/lisp/textmodes/fill-resources/semlf-sentence-end-double-space.erts:
* test/lisp/textmodes/fill-resources/semlf-twice.erts:
* test/lisp/textmodes/fill-resources/semlf.erts: Add test data.
---
 lisp/textmodes/fill.el                        |  47 +++++
 .../fill-resources/semlf-c-mode.erts          | 183 ++++++++++++++++++
 .../fill-resources/semlf-emacs-lisp-mode.erts |  87 +++++++++
 .../fill-resources/semlf-fill-column.erts     |  15 ++
 .../semlf-fill-paragraph-function.erts        |  12 ++
 .../fill-resources/semlf-fill-prefix.erts     |  35 ++++
 .../fill-resources/semlf-indented-block.erts  |  31 +++
 .../fill-resources/semlf-justify.erts         |  12 ++
 .../fill-resources/semlf-markdown-mode.erts   | 129 ++++++++++++
 .../fill-resources/semlf-org-mode.erts        | 122 ++++++++++++
 .../semlf-punctuation-marks.erts              |  13 ++
 .../semlf-sentence-end-double-space.erts      |  13 ++
 .../textmodes/fill-resources/semlf-twice.erts |  12 ++
 test/lisp/textmodes/fill-resources/semlf.erts |  88 +++++++++
 test/lisp/textmodes/fill-tests.el             |  90 +++++++++
 15 files changed, 889 insertions(+)
 create mode 100644 test/lisp/textmodes/fill-resources/semlf-c-mode.erts
 create mode 100644 test/lisp/textmodes/fill-resources/semlf-emacs-lisp-mode.erts
 create mode 100644 test/lisp/textmodes/fill-resources/semlf-fill-column.erts
 create mode 100644 test/lisp/textmodes/fill-resources/semlf-fill-paragraph-function.erts
 create mode 100644 test/lisp/textmodes/fill-resources/semlf-fill-prefix.erts
 create mode 100644 test/lisp/textmodes/fill-resources/semlf-indented-block.erts
 create mode 100644 test/lisp/textmodes/fill-resources/semlf-justify.erts
 create mode 100644 test/lisp/textmodes/fill-resources/semlf-markdown-mode.erts
 create mode 100644 test/lisp/textmodes/fill-resources/semlf-org-mode.erts
 create mode 100644 test/lisp/textmodes/fill-resources/semlf-punctuation-marks.erts
 create mode 100644 test/lisp/textmodes/fill-resources/semlf-sentence-end-double-space.erts
 create mode 100644 test/lisp/textmodes/fill-resources/semlf-twice.erts
 create mode 100644 test/lisp/textmodes/fill-resources/semlf.erts

diff --git a/lisp/textmodes/fill.el b/lisp/textmodes/fill.el
index e38d030734fb..b6b413f88b2d 100644
--- a/lisp/textmodes/fill.el
+++ b/lisp/textmodes/fill.el
@@ -1583,4 +1583,51 @@ fill-individual-paragraphs-citation
 	"")
     string))
 
+(defun fill-paragraph-semlf (&optional justify)
+  "Fill paragraph at or after point using semantic linefeeds.
+
+This function ensures that a newline character follows every sentence.
+If a sentence is not followed by a newline character, one is inserted.
+The task of deciding what is considered a sentence is delegated to the
+`forward-sentence' function.
+
+If JUSTIFY is non-nil (interactively, with prefix argument), justify as
+well.  If `sentence-end-double-space' is non-nil, then period followed
+by one space does not end a sentence, so don't break a line there.
+The variable `fill-column' controls the width for filling.
+
+This function can be assigned as a value for `fill-paragraph-function',
+allowing `fill-paragraph' to utilize it.
+
+For more details about semantic linefeeds, see `https://sembr.org/' and
+`https://rhodesmill.org/brandon/2012/one-sentence-per-line/'."
+  (interactive "P")
+  (save-excursion
+    (let ((end (progn
+		 (fill-forward-paragraph 1)
+		 (backward-word)
+		 (end-of-line)
+		 (point)))
+	  (start (progn
+		   (fill-forward-paragraph -1)
+		   (forward-word)
+		   (beginning-of-line)
+		   (point)))
+	  pfx)
+      (with-restriction start end
+	(let ((fill-column (point-max)))
+	  (setq pfx (or (fill-region-as-paragraph (point-min) (point-max)) "")))
+	(goto-char (point-min))
+	(while (not (eobp))
+	  (let ((fill-prefix pfx))
+	    (fill-region-as-paragraph (point)
+				      (progn (forward-sentence) (point))
+				      justify))
+	  (when (and (> (point) (line-beginning-position))
+		     (< (point) (line-end-position)))
+	    (delete-horizontal-space)
+	    (insert "\n")
+	    (insert pfx))))))
+  t)
+
 ;;; fill.el ends here
diff --git a/test/lisp/textmodes/fill-resources/semlf-c-mode.erts b/test/lisp/textmodes/fill-resources/semlf-c-mode.erts
new file mode 100644
index 000000000000..a28eb68cfc6a
--- /dev/null
+++ b/test/lisp/textmodes/fill-resources/semlf-c-mode.erts
@@ -0,0 +1,183 @@
+Point-Char: |
+
+Name: c-mode - single-line
+
+=-=
+// Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do
+// eiusmod tempor.  Incididunt ut labore et dolore magna aliqua. Ut enim
+// ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut.
+=-=
+// Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do
+// eiusmod tempor.
+// Incididunt ut labore et dolore magna aliqua. Ut enim ad minim
+// veniam, quis nostrud exercitation ullamco laboris nisi ut.
+=-=-=
+
+Name: c-mode - single-line - fill-prefix - marker
+
+=-=
+// - Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor.  Incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut.
+// - Aliquip ex ea commodo consequat.  Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur.
+// - Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.
+=-=
+// - Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do
+// - eiusmod tempor.
+// - Incididunt ut labore et dolore magna aliqua. Ut enim ad minim
+// - veniam, quis nostrud exercitation ullamco laboris nisi ut.
+// - Aliquip ex ea commodo consequat.
+// - Duis aute irure dolor in reprehenderit in voluptate velit esse
+// - cillum dolore eu fugiat nulla pariatur.
+// - Excepteur sint occaecat cupidatat non proident, sunt in culpa qui
+// - officia deserunt mollit anim id est laborum.
+=-=-=
+
+Name: c-mode - single-line - fill-prefix - whitespace
+
+=-=
+// - Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor.  Incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut.
+//   Aliquip ex ea commodo consequat.  Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur.
+//   Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.
+=-=
+// - Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do
+//   eiusmod tempor.
+//   Incididunt ut labore et dolore magna aliqua. Ut enim ad minim
+//   veniam, quis nostrud exercitation ullamco laboris nisi ut.
+//   Aliquip ex ea commodo consequat.
+//   Duis aute irure dolor in reprehenderit in voluptate velit esse
+//   cillum dolore eu fugiat nulla pariatur.
+//   Excepteur sint occaecat cupidatat non proident, sunt in culpa qui
+//   officia deserunt mollit anim id est laborum.
+=-=-=
+
+Name: c-mode - single-line - indented block
+
+=-=
+// Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do
+// eiusmod tempor.  Incididunt ut labore et dolore magna aliqua. Ut
+// enim ad minim veniam, quis nostrud exercitation ullamco laboris
+// nisi ut.
+//
+// 	|Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed
+// 	do eiusmod tempor.  Incididunt ut labore et dolore magna
+// 	aliqua. Ut enim ad minim veniam, quis nostrud exercitation
+// 	ullamco laboris nisi ut.
+//
+// Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do
+// eiusmod tempor.  Incididunt ut labore et dolore magna aliqua. Ut
+// enim ad minim veniam, quis nostrud exercitation ullamco laboris
+// nisi ut.
+=-=
+// Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do
+// eiusmod tempor.  Incididunt ut labore et dolore magna aliqua. Ut
+// enim ad minim veniam, quis nostrud exercitation ullamco laboris
+// nisi ut.
+//
+// 	Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed
+// 	do eiusmod tempor.
+// 	Incididunt ut labore et dolore magna aliqua. Ut enim ad minim
+// 	veniam, quis nostrud exercitation ullamco laboris nisi ut.
+//
+// Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do
+// eiusmod tempor.  Incididunt ut labore et dolore magna aliqua. Ut
+// enim ad minim veniam, quis nostrud exercitation ullamco laboris
+// nisi ut.
+=-=-=
+
+Name: c-mode - multi-line
+
+=-=
+/*
+ * Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do
+ * eiusmod tempor.  Incididunt ut labore et dolore magna aliqua. Ut enim
+ * ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut.
+ */
+=-=
+/*
+ * Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do
+ * eiusmod tempor.
+ * Incididunt ut labore et dolore magna aliqua. Ut enim ad minim
+ * veniam, quis nostrud exercitation ullamco laboris nisi ut.
+ */
+=-=-=
+
+Name: c-mode - multi-line - fill-prefix - marker
+
+=-=
+/*
+ * - Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor.  Incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut.
+ * - Aliquip ex ea commodo consequat.  Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur.
+ * - Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.
+ */
+=-=
+/*
+ * - Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do
+ * - eiusmod tempor.
+ * - Incididunt ut labore et dolore magna aliqua. Ut enim ad minim
+ * - veniam, quis nostrud exercitation ullamco laboris nisi ut.
+ * - Aliquip ex ea commodo consequat.
+ * - Duis aute irure dolor in reprehenderit in voluptate velit esse
+ * - cillum dolore eu fugiat nulla pariatur.
+ * - Excepteur sint occaecat cupidatat non proident, sunt in culpa qui
+ * - officia deserunt mollit anim id est laborum.
+ */
+=-=-=
+
+Name: c-mode - multi-line - fill-prefix - whitespace
+
+=-=
+/*
+ * - Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor.  Incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut.
+ *   Aliquip ex ea commodo consequat.  Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur.
+ *   Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.
+ */
+=-=
+/*
+ * - Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do
+ *   eiusmod tempor.
+ *   Incididunt ut labore et dolore magna aliqua. Ut enim ad minim
+ *   veniam, quis nostrud exercitation ullamco laboris nisi ut.
+ *   Aliquip ex ea commodo consequat.
+ *   Duis aute irure dolor in reprehenderit in voluptate velit esse
+ *   cillum dolore eu fugiat nulla pariatur.
+ *   Excepteur sint occaecat cupidatat non proident, sunt in culpa qui
+ *   officia deserunt mollit anim id est laborum.
+ */
+=-=-=
+
+Name: c-mode - multi-line - indented block
+
+=-=
+/*
+ * Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do
+ * eiusmod tempor.  Incididunt ut labore et dolore magna aliqua. Ut
+ * enim ad minim veniam, quis nostrud exercitation ullamco laboris
+ * nisi ut.
+ *
+ * 	|Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed
+ * 	do eiusmod tempor.  Incididunt ut labore et dolore magna
+ * 	aliqua. Ut enim ad minim veniam, quis nostrud exercitation
+ * 	ullamco laboris nisi ut.
+ *
+ * Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do
+ * eiusmod tempor.  Incididunt ut labore et dolore magna aliqua. Ut
+ * enim ad minim veniam, quis nostrud exercitation ullamco laboris
+ * nisi ut.
+ */
+=-=
+/*
+ * Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do
+ * eiusmod tempor.  Incididunt ut labore et dolore magna aliqua. Ut
+ * enim ad minim veniam, quis nostrud exercitation ullamco laboris
+ * nisi ut.
+ *
+ * 	Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed
+ * 	do eiusmod tempor.
+ * 	Incididunt ut labore et dolore magna aliqua. Ut enim ad minim
+ * 	veniam, quis nostrud exercitation ullamco laboris nisi ut.
+ *
+ * Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do
+ * eiusmod tempor.  Incididunt ut labore et dolore magna aliqua. Ut
+ * enim ad minim veniam, quis nostrud exercitation ullamco laboris
+ * nisi ut.
+ */
+=-=-=
diff --git a/test/lisp/textmodes/fill-resources/semlf-emacs-lisp-mode.erts b/test/lisp/textmodes/fill-resources/semlf-emacs-lisp-mode.erts
new file mode 100644
index 000000000000..fe71ee32c1aa
--- /dev/null
+++ b/test/lisp/textmodes/fill-resources/semlf-emacs-lisp-mode.erts
@@ -0,0 +1,87 @@
+Point-Char: |
+
+Name: emacs-lisp-mode
+
+=-=
+;; Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do
+;; eiusmod tempor.  Incididunt ut labore et dolore magna aliqua. Ut enim
+;; ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut.
+=-=
+;; Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do
+;; eiusmod tempor.
+;; Incididunt ut labore et dolore magna aliqua. Ut enim ad minim
+;; veniam, quis nostrud exercitation ullamco laboris nisi ut.
+=-=-=
+
+Name: emacs-lisp-mode - fill-prefix - marker
+
+=-=
+;; - Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor.  Incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut.
+;; - Aliquip ex ea commodo consequat.  Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur.
+;; - Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.
+=-=
+;; - Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do
+;; - eiusmod tempor.
+;; - Incididunt ut labore et dolore magna aliqua. Ut enim ad minim
+;; - veniam, quis nostrud exercitation ullamco laboris nisi ut.
+;; - Aliquip ex ea commodo consequat.
+;; - Duis aute irure dolor in reprehenderit in voluptate velit esse
+;; - cillum dolore eu fugiat nulla pariatur.
+;; - Excepteur sint occaecat cupidatat non proident, sunt in culpa qui
+;; - officia deserunt mollit anim id est laborum.
+=-=-=
+
+Name: emacs-lisp-mode - fill-prefix - whitespace
+
+=-=
+;; - Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor.  Incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut.
+;;   Aliquip ex ea commodo consequat.  Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur.
+;;   Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.
+=-=
+;; - Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do
+;;   eiusmod tempor.
+;;   Incididunt ut labore et dolore magna aliqua. Ut enim ad minim
+;;   veniam, quis nostrud exercitation ullamco laboris nisi ut.
+;;   Aliquip ex ea commodo consequat.
+;;   Duis aute irure dolor in reprehenderit in voluptate velit esse
+;;   cillum dolore eu fugiat nulla pariatur.
+;;   Excepteur sint occaecat cupidatat non proident, sunt in culpa qui
+;;   officia deserunt mollit anim id est laborum.
+=-=-=
+
+Name: emacs-lisp-mode - indented block
+
+The `fill-forward-paragraph' function jumps to the beginning/end of
+the comment.
+
+=-=
+;; Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do
+;; eiusmod tempor.  Incididunt ut labore et dolore magna aliqua. Ut
+;; enim ad minim veniam, quis nostrud exercitation ullamco laboris
+;; nisi ut.
+
+;; 	|Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed
+;; 	do eiusmod tempor.  Incididunt ut labore et dolore magna
+;; 	aliqua. Ut enim ad minim veniam, quis nostrud exercitation
+;; 	ullamco laboris nisi ut.
+
+;; Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do
+;; eiusmod tempor.  Incididunt ut labore et dolore magna aliqua. Ut
+;; enim ad minim veniam, quis nostrud exercitation ullamco laboris
+;; nisi ut.
+=-=
+;; Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do
+;; eiusmod tempor.  Incididunt ut labore et dolore magna aliqua. Ut
+;; enim ad minim veniam, quis nostrud exercitation ullamco laboris
+;; nisi ut.
+
+;; 	Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed
+;; 	do eiusmod tempor.
+;; 	Incididunt ut labore et dolore magna aliqua. Ut enim ad minim
+;; 	veniam, quis nostrud exercitation ullamco laboris nisi ut.
+
+;; Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do
+;; eiusmod tempor.  Incididunt ut labore et dolore magna aliqua. Ut
+;; enim ad minim veniam, quis nostrud exercitation ullamco laboris
+;; nisi ut.
+=-=-=
diff --git a/test/lisp/textmodes/fill-resources/semlf-fill-column.erts b/test/lisp/textmodes/fill-resources/semlf-fill-column.erts
new file mode 100644
index 000000000000..20db7b1f9c5b
--- /dev/null
+++ b/test/lisp/textmodes/fill-resources/semlf-fill-column.erts
@@ -0,0 +1,15 @@
+Name: fill-column
+
+=-=
+Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do
+eiusmod tempor.  Incididunt ut labore et dolore magna aliqua. Ut enim
+ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut.
+=-=
+Lorem ipsum dolor sit amet,
+consectetur adipiscing elit, sed do
+eiusmod tempor.
+Incididunt ut labore et dolore
+magna aliqua. Ut enim ad minim
+veniam, quis nostrud exercitation
+ullamco laboris nisi ut.
+=-=-=
diff --git a/test/lisp/textmodes/fill-resources/semlf-fill-paragraph-function.erts b/test/lisp/textmodes/fill-resources/semlf-fill-paragraph-function.erts
new file mode 100644
index 000000000000..467e7401cf50
--- /dev/null
+++ b/test/lisp/textmodes/fill-resources/semlf-fill-paragraph-function.erts
@@ -0,0 +1,12 @@
+Name: fill-paragraph-function
+
+=-=
+Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do
+eiusmod tempor.  Incididunt ut labore et dolore magna aliqua. Ut enim
+ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut.
+=-=
+Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do
+eiusmod tempor.
+Incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam,
+quis nostrud exercitation ullamco laboris nisi ut.
+=-=-=
diff --git a/test/lisp/textmodes/fill-resources/semlf-fill-prefix.erts b/test/lisp/textmodes/fill-resources/semlf-fill-prefix.erts
new file mode 100644
index 000000000000..e067eff69701
--- /dev/null
+++ b/test/lisp/textmodes/fill-resources/semlf-fill-prefix.erts
@@ -0,0 +1,35 @@
+Name: fill-prefix - marker
+
+=-=
+- Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor.  Incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut.
+- Aliquip ex ea commodo consequat.  Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur.
+- Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.
+=-=
+- Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do
+- eiusmod tempor.
+- Incididunt ut labore et dolore magna aliqua. Ut enim ad minim
+- veniam, quis nostrud exercitation ullamco laboris nisi ut.
+- Aliquip ex ea commodo consequat.
+- Duis aute irure dolor in reprehenderit in voluptate velit esse
+- cillum dolore eu fugiat nulla pariatur.
+- Excepteur sint occaecat cupidatat non proident, sunt in culpa qui
+- officia deserunt mollit anim id est laborum.
+=-=-=
+
+Name: fill-prefix - whitespace
+
+=-=
+- Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor.  Incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut.
+  Aliquip ex ea commodo consequat.  Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur.
+  Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.
+=-=
+- Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do
+  eiusmod tempor.
+  Incididunt ut labore et dolore magna aliqua. Ut enim ad minim
+  veniam, quis nostrud exercitation ullamco laboris nisi ut.
+  Aliquip ex ea commodo consequat.
+  Duis aute irure dolor in reprehenderit in voluptate velit esse
+  cillum dolore eu fugiat nulla pariatur.
+  Excepteur sint occaecat cupidatat non proident, sunt in culpa qui
+  officia deserunt mollit anim id est laborum.
+=-=-=
diff --git a/test/lisp/textmodes/fill-resources/semlf-indented-block.erts b/test/lisp/textmodes/fill-resources/semlf-indented-block.erts
new file mode 100644
index 000000000000..e483567c6ab3
--- /dev/null
+++ b/test/lisp/textmodes/fill-resources/semlf-indented-block.erts
@@ -0,0 +1,31 @@
+Point-Char: |
+
+Name: indented block
+
+=-=
+Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do
+eiusmod tempor.  Incididunt ut labore et dolore magna aliqua. Ut enim
+ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut.
+
+	|Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed
+	do eiusmod tempor.  Incididunt ut labore et dolore magna
+	aliqua. Ut enim ad minim veniam, quis nostrud exercitation
+	ullamco laboris nisi ut.
+
+Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do
+eiusmod tempor.  Incididunt ut labore et dolore magna aliqua. Ut enim
+ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut.
+=-=
+Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do
+eiusmod tempor.  Incididunt ut labore et dolore magna aliqua. Ut enim
+ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut.
+
+	Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed
+	do eiusmod tempor.
+	Incididunt ut labore et dolore magna aliqua. Ut enim ad minim
+	veniam, quis nostrud exercitation ullamco laboris nisi ut.
+
+Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do
+eiusmod tempor.  Incididunt ut labore et dolore magna aliqua. Ut enim
+ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut.
+=-=-=
diff --git a/test/lisp/textmodes/fill-resources/semlf-justify.erts b/test/lisp/textmodes/fill-resources/semlf-justify.erts
new file mode 100644
index 000000000000..3a951b7ce424
--- /dev/null
+++ b/test/lisp/textmodes/fill-resources/semlf-justify.erts
@@ -0,0 +1,12 @@
+Name: justify
+
+=-=
+Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do
+eiusmod tempor.  Incididunt ut labore et dolore magna aliqua. Ut enim
+ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut.
+=-=
+Lorem  ipsum  dolor sit  amet,  consectetur  adipiscing elit,  sed  do
+eiusmod tempor.
+Incididunt ut labore et dolore magna  aliqua. Ut enim ad minim veniam,
+quis nostrud exercitation ullamco laboris nisi ut.
+=-=-=
diff --git a/test/lisp/textmodes/fill-resources/semlf-markdown-mode.erts b/test/lisp/textmodes/fill-resources/semlf-markdown-mode.erts
new file mode 100644
index 000000000000..7257708c245d
--- /dev/null
+++ b/test/lisp/textmodes/fill-resources/semlf-markdown-mode.erts
@@ -0,0 +1,129 @@
+Point-Char: |
+
+Name: markdown-mode
+
+=-=
+Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do
+eiusmod tempor.  Incididunt ut labore et dolore magna aliqua. Ut enim
+ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut.
+=-=
+Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do
+eiusmod tempor.
+Incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam,
+quis nostrud exercitation ullamco laboris nisi ut.
+=-=-=
+
+Name: markdown-mode - list - one single-line item
+
+=-=
+- Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor.  Incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut.
+=-=
+- Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do
+  eiusmod tempor.
+  Incididunt ut labore et dolore magna aliqua. Ut enim ad minim
+  veniam, quis nostrud exercitation ullamco laboris nisi ut.
+=-=-=
+
+Name: markdown-mode - list - multiple single-line items
+
+=-=
+- Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor.  Incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut.
+- Aliquip ex ea commodo consequat.  Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur.
+- Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.
+=-=
+- Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do
+  eiusmod tempor.
+  Incididunt ut labore et dolore magna aliqua. Ut enim ad minim
+  veniam, quis nostrud exercitation ullamco laboris nisi ut.
+- Aliquip ex ea commodo consequat.  Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur.
+- Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.
+=-=-=
+
+Name: markdown-mode - list - one multi-line item
+
+=-=
+- Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do
+  eiusmod tempor.  Incididunt ut labore et dolore magna aliqua. Ut
+  enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi
+  ut.
+=-=
+- Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do
+  eiusmod tempor.
+  Incididunt ut labore et dolore magna aliqua. Ut enim ad minim
+  veniam, quis nostrud exercitation ullamco laboris nisi ut.
+=-=-=
+
+Name: markdown-mode - list - multiple multi-line items
+
+=-=
+- Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do
+  eiusmod tempor.  Incididunt ut labore et dolore magn a aliqua. Ut
+  enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi
+  ut.
+- Aliquip ex ea commodo consequat.  Duis aute irure dolor in
+  reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla
+  pariatur.
+- Excepteur sint occaecat cupidatat non proident, sunt in culpa qui
+  officia deserunt mollit anim id est laborum.
+=-=
+- Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do
+  eiusmod tempor.
+  Incididunt ut labore et dolore magn a aliqua. Ut enim ad minim
+  veniam, quis nostrud exercitation ullamco laboris nisi ut.
+- Aliquip ex ea commodo consequat.  Duis aute irure dolor in
+  reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla
+  pariatur.
+- Excepteur sint occaecat cupidatat non proident, sunt in culpa qui
+  officia deserunt mollit anim id est laborum.
+=-=-=
+
+Name: markdown-mode - list - short sentence in multi-line item
+
+=-=
+- Lorem ipsum dolor.  Sit amet, consectetur adipiscing elit, sed do
+  eiusmod tempor.  Incididunt ut labore et dolore magn a aliqua. Ut
+  enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi
+  ut.
+=-=
+- Lorem ipsum dolor.
+  Sit amet, consectetur adipiscing elit, sed do eiusmod tempor.
+  Incididunt ut labore et dolore magn a aliqua. Ut enim ad minim
+  veniam, quis nostrud exercitation ullamco laboris nisi ut.
+=-=-=
+
+Name: markdown-mode - indented block
+Skip: t
+
+TODO - In `markdown-mode', the `fill-forward-paragraph' function
+ignores code blocks.  We should reach out to the `markdown-mode'
+maintainer(s) to understand the reason for this and possibly suggest a
+change to this behavior.  This works as expected in
+`markdown-ts-mode'.
+
+=-=
+Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do
+eiusmod tempor.  Incididunt ut labore et dolore magna aliqua. Ut enim
+ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut.
+
+	|Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed
+	do eiusmod tempor.  Incididunt ut labore et dolore magna
+	aliqua. Ut enim ad minim veniam, quis nostrud exercitation
+	ullamco laboris nisi ut.
+
+Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do
+eiusmod tempor.  Incididunt ut labore et dolore magna aliqua. Ut enim
+ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut.
+=-=
+Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do
+eiusmod tempor.  Incididunt ut labore et dolore magna aliqua. Ut enim
+ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut.
+
+	Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed
+	do eiusmod tempor.
+	Incididunt ut labore et dolore magna aliqua. Ut enim ad minim
+	veniam, quis nostrud exercitation ullamco laboris nisi ut.
+
+Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do
+eiusmod tempor.  Incididunt ut labore et dolore magna aliqua. Ut enim
+ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut.
+=-=-=
diff --git a/test/lisp/textmodes/fill-resources/semlf-org-mode.erts b/test/lisp/textmodes/fill-resources/semlf-org-mode.erts
new file mode 100644
index 000000000000..81dd4841de94
--- /dev/null
+++ b/test/lisp/textmodes/fill-resources/semlf-org-mode.erts
@@ -0,0 +1,122 @@
+Point-Char: |
+
+Name: org-mode
+
+=-=
+Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do
+eiusmod tempor.  Incididunt ut labore et dolore magna aliqua. Ut enim
+ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut.
+=-=
+Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do
+eiusmod tempor.
+Incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam,
+quis nostrud exercitation ullamco laboris nisi ut.
+=-=-=
+
+Name: org-mode - list - one single-line item
+
+=-=
+- Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor.  Incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut.
+=-=
+- Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do
+  eiusmod tempor.
+  Incididunt ut labore et dolore magna aliqua. Ut enim ad minim
+  veniam, quis nostrud exercitation ullamco laboris nisi ut.
+=-=-=
+
+Name: org-mode - list - multiple single-line items
+
+=-=
+- Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor.  Incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut.
+- Aliquip ex ea commodo consequat.  Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur.
+- Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.
+=-=
+- Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do
+  eiusmod tempor.
+  Incididunt ut labore et dolore magna aliqua. Ut enim ad minim
+  veniam, quis nostrud exercitation ullamco laboris nisi ut.
+- Aliquip ex ea commodo consequat.  Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur.
+- Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.
+=-=-=
+
+Name: org-mode - list - one multi-line item
+
+=-=
+- Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do
+  eiusmod tempor.  Incididunt ut labore et dolore magna aliqua. Ut
+  enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi
+  ut.
+=-=
+- Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do
+  eiusmod tempor.
+  Incididunt ut labore et dolore magna aliqua. Ut enim ad minim
+  veniam, quis nostrud exercitation ullamco laboris nisi ut.
+=-=-=
+
+Name: org-mode - list - multiple multi-line items
+
+=-=
+- Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do
+  eiusmod tempor.  Incididunt ut labore et dolore magn a aliqua. Ut
+  enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi
+  ut.
+- Aliquip ex ea commodo consequat.  Duis aute irure dolor in
+  reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla
+  pariatur.
+- Excepteur sint occaecat cupidatat non proident, sunt in culpa qui
+  officia deserunt mollit anim id est laborum.
+=-=
+- Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do
+  eiusmod tempor.
+  Incididunt ut labore et dolore magn a aliqua. Ut enim ad minim
+  veniam, quis nostrud exercitation ullamco laboris nisi ut.
+- Aliquip ex ea commodo consequat.  Duis aute irure dolor in
+  reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla
+  pariatur.
+- Excepteur sint occaecat cupidatat non proident, sunt in culpa qui
+  officia deserunt mollit anim id est laborum.
+=-=-=
+
+Name: org-mode - list - short sentence in multi-line item
+
+=-=
+- Lorem ipsum dolor.  Sit amet, consectetur adipiscing elit, sed do
+  eiusmod tempor.  Incididunt ut labore et dolore magn a aliqua. Ut
+  enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi
+  ut.
+=-=
+- Lorem ipsum dolor.
+  Sit amet, consectetur adipiscing elit, sed do eiusmod tempor.
+  Incididunt ut labore et dolore magn a aliqua. Ut enim ad minim
+  veniam, quis nostrud exercitation ullamco laboris nisi ut.
+=-=-=
+
+Name: org-mode - indented block
+
+=-=
+Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do
+eiusmod tempor.  Incididunt ut labore et dolore magna aliqua. Ut enim
+ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut.
+
+	|Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed
+	do eiusmod tempor.  Incididunt ut labore et dolore magna
+	aliqua. Ut enim ad minim veniam, quis nostrud exercitation
+	ullamco laboris nisi ut.
+
+Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do
+eiusmod tempor.  Incididunt ut labore et dolore magna aliqua. Ut enim
+ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut.
+=-=
+Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do
+eiusmod tempor.  Incididunt ut labore et dolore magna aliqua. Ut enim
+ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut.
+
+	Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed
+	do eiusmod tempor.
+	Incididunt ut labore et dolore magna aliqua. Ut enim ad minim
+	veniam, quis nostrud exercitation ullamco laboris nisi ut.
+
+Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do
+eiusmod tempor.  Incididunt ut labore et dolore magna aliqua. Ut enim
+ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut.
+=-=-=
diff --git a/test/lisp/textmodes/fill-resources/semlf-punctuation-marks.erts b/test/lisp/textmodes/fill-resources/semlf-punctuation-marks.erts
new file mode 100644
index 000000000000..5346216e9f9c
--- /dev/null
+++ b/test/lisp/textmodes/fill-resources/semlf-punctuation-marks.erts
@@ -0,0 +1,13 @@
+Name: punctuation marks
+
+=-=
+Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do
+eiusmod tempor.  Incididunt ut labore et dolore magna aliqua!  Ut enim
+ad minim veniam?  Quis nostrud exercitation ullamco laboris nisi ut.
+=-=
+Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do
+eiusmod tempor.
+Incididunt ut labore et dolore magna aliqua!
+Ut enim ad minim veniam?
+Quis nostrud exercitation ullamco laboris nisi ut.
+=-=-=
diff --git a/test/lisp/textmodes/fill-resources/semlf-sentence-end-double-space.erts b/test/lisp/textmodes/fill-resources/semlf-sentence-end-double-space.erts
new file mode 100644
index 000000000000..a01beed0f665
--- /dev/null
+++ b/test/lisp/textmodes/fill-resources/semlf-sentence-end-double-space.erts
@@ -0,0 +1,13 @@
+Name: sentence-end-double-space
+
+=-=
+Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do
+eiusmod tempor.  Incididunt ut labore et dolore magna aliqua. Ut enim
+ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut.
+=-=
+Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do
+eiusmod tempor.
+Incididunt ut labore et dolore magna aliqua.
+Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris
+nisi ut.
+=-=-=
diff --git a/test/lisp/textmodes/fill-resources/semlf-twice.erts b/test/lisp/textmodes/fill-resources/semlf-twice.erts
new file mode 100644
index 000000000000..862dda6e27eb
--- /dev/null
+++ b/test/lisp/textmodes/fill-resources/semlf-twice.erts
@@ -0,0 +1,12 @@
+Name: fill twice
+
+=-=
+Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do
+eiusmod tempor.  Incididunt ut labore et dolore magna aliqua. Ut enim
+ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut.
+=-=
+Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do
+eiusmod tempor.
+Incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam,
+quis nostrud exercitation ullamco laboris nisi ut.
+=-=-=
diff --git a/test/lisp/textmodes/fill-resources/semlf.erts b/test/lisp/textmodes/fill-resources/semlf.erts
new file mode 100644
index 000000000000..f3e331cd9381
--- /dev/null
+++ b/test/lisp/textmodes/fill-resources/semlf.erts
@@ -0,0 +1,88 @@
+Point-Char: |
+
+Name: beginning of buffer
+
+=-=
+|Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do
+eiusmod tempor.  Incididunt ut labore et dolore magna aliqua. Ut enim
+ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut.
+
+Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do
+eiusmod tempor.  Incididunt ut labore et dolore magna aliqua. Ut enim
+ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut.
+
+Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do
+eiusmod tempor.  Incididunt ut labore et dolore magna aliqua. Ut enim
+ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut.
+=-=
+Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do
+eiusmod tempor.
+Incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam,
+quis nostrud exercitation ullamco laboris nisi ut.
+
+Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do
+eiusmod tempor.  Incididunt ut labore et dolore magna aliqua. Ut enim
+ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut.
+
+Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do
+eiusmod tempor.  Incididunt ut labore et dolore magna aliqua. Ut enim
+ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut.
+=-=-=
+
+Name: second paragraph
+
+=-=
+Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do
+eiusmod tempor.  Incididunt ut labore et dolore magna aliqua. Ut enim
+ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut.
+
+|Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do
+eiusmod tempor.  Incididunt ut labore et dolore magna aliqua. Ut enim
+ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut.
+
+Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do
+eiusmod tempor.  Incididunt ut labore et dolore magna aliqua. Ut enim
+ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut.
+=-=
+Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do
+eiusmod tempor.  Incididunt ut labore et dolore magna aliqua. Ut enim
+ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut.
+
+Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do
+eiusmod tempor.
+Incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam,
+quis nostrud exercitation ullamco laboris nisi ut.
+
+Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do
+eiusmod tempor.  Incididunt ut labore et dolore magna aliqua. Ut enim
+ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut.
+=-=-=
+
+Name: end of buffer
+
+=-=
+Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do
+eiusmod tempor.  Incididunt ut labore et dolore magna aliqua. Ut enim
+ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut.
+
+Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do
+eiusmod tempor.  Incididunt ut labore et dolore magna aliqua. Ut enim
+ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut.
+
+Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do
+eiusmod tempor.  Incididunt ut labore et dolore magna aliqua. Ut enim
+ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut.|
+=-=
+Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do
+eiusmod tempor.  Incididunt ut labore et dolore magna aliqua. Ut enim
+ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut.
+
+Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do
+eiusmod tempor.  Incididunt ut labore et dolore magna aliqua. Ut enim
+ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut.
+
+Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do
+eiusmod tempor.
+Incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam,
+quis nostrud exercitation ullamco laboris nisi ut.
+=-=-=
diff --git a/test/lisp/textmodes/fill-tests.el b/test/lisp/textmodes/fill-tests.el
index 6e079973100e..afd17c52dcd5 100644
--- a/test/lisp/textmodes/fill-tests.el
+++ b/test/lisp/textmodes/fill-tests.el
@@ -28,6 +28,7 @@
 ;;; Code:
 
 (require 'ert)
+(require 'ert-x)
 
 (ert-deftest fill-test-no-fill-polish-nobreak-p nil
   "Tests of the `fill-polish-nobreak-p' function."
@@ -121,6 +122,95 @@ test-fill-haskell
   ;; w
 ")))
 
+(ert-deftest fill-test-fill-paragraph-semlf ()
+  "Test the `fill-paragraph-semlf' function."
+  (ert-test-erts-file (ert-resource-file "semlf.erts")
+                      (lambda ()
+			(fill-paragraph-semlf))))
+
+(ert-deftest fill-test-fill-paragraph-semlf-fill-paragraph-function ()
+  "Test `fill-paragraph-semlf' as `fill-paragraph-function'."
+  (ert-test-erts-file (ert-resource-file "semlf-fill-paragraph-function.erts")
+                      (lambda ()
+			(setq-local fill-paragraph-function #'fill-paragraph-semlf)
+			(fill-paragraph))))
+
+(ert-deftest fill-test-fill-paragraph-semlf-justify ()
+  "Test the JUSTIFY parameter of the `fill-paragraph-semlf' function."
+  (ert-test-erts-file (ert-resource-file "semlf-justify.erts")
+                      (lambda ()
+			(fill-paragraph-semlf 'justify))))
+
+(ert-deftest fill-test-fill-paragraph-semlf-sentence-end-double-space ()
+  "Test the `fill-paragraph-semlf' function with `sentence-end-double-space'."
+  (ert-test-erts-file (ert-resource-file "semlf-sentence-end-double-space.erts")
+                      (lambda ()
+			(setq-local sentence-end-double-space nil)
+			(fill-paragraph-semlf))))
+
+(ert-deftest fill-test-fill-paragraph-semlf-fill-column ()
+  "Test the `fill-paragraph-semlf' function with `fill-column'."
+  (ert-test-erts-file (ert-resource-file "semlf-fill-column.erts")
+                      (lambda ()
+			(setq-local fill-column 35)
+			(fill-paragraph-semlf))))
+
+(ert-deftest fill-test-fill-paragraph-semlf-punctuation-marks ()
+  "Test the `fill-paragraph-semlf' function with different punctuation marks."
+  (ert-test-erts-file (ert-resource-file "semlf-punctuation-marks.erts")
+                      (lambda ()
+			(fill-paragraph-semlf))))
+
+(ert-deftest fill-test-fill-paragraph-semlf-twice ()
+  "Test to run the `fill-paragraph-semlf' function twice."
+  (ert-test-erts-file (ert-resource-file "semlf-twice.erts")
+                      (lambda ()
+			(goto-char (point-min))
+			(fill-paragraph-semlf)
+			(goto-char (point-min))
+			(fill-paragraph-semlf))))
+
+(ert-deftest fill-test-fill-paragraph-semlf-fill-prefix ()
+  "Test the `fill-paragraph-semlf' function with different fill prefixes."
+  (ert-test-erts-file (ert-resource-file "semlf-fill-prefix.erts")
+                      (lambda ()
+			(fill-paragraph-semlf))))
+
+(ert-deftest fill-test-fill-paragraph-semlf-indented-block ()
+  "Test the `fill-paragraph-semlf' function with an indented block."
+  (ert-test-erts-file (ert-resource-file "semlf-indented-block.erts")
+                      (lambda ()
+			(fill-paragraph-semlf))))
+
+(ert-deftest fill-test-fill-paragraph-semlf-emacs-lisp-mode ()
+  "Test the `fill-paragraph-semlf' function with `emacs-lisp-mode'."
+  (ert-test-erts-file (ert-resource-file "semlf-emacs-lisp-mode.erts")
+                      (lambda ()
+			(emacs-lisp-mode)
+			(fill-paragraph-semlf))))
+
+(ert-deftest fill-test-fill-paragraph-semlf-c-mode ()
+  "Test the `fill-paragraph-semlf' function with `c-mode'."
+  (ert-test-erts-file (ert-resource-file "semlf-c-mode.erts")
+                      (lambda ()
+			(c-mode)
+			(fill-paragraph-semlf))))
+
+(ert-deftest fill-test-fill-paragraph-semlf-org-mode ()
+  "Test the `fill-paragraph-semlf' function with `org-mode'."
+  (ert-test-erts-file (ert-resource-file "semlf-org-mode.erts")
+                      (lambda ()
+			(org-mode)
+			(fill-paragraph-semlf))))
+
+(ert-deftest fill-test-fill-paragraph-semlf-markdown-mode ()
+  "Test the `fill-paragraph-semlf' function with `markdown-mode'."
+  (skip-unless (functionp 'markdown-mode))
+  (ert-test-erts-file (ert-resource-file "semlf-markdown-mode.erts")
+                      (lambda ()
+			(markdown-mode)
+			(fill-paragraph-semlf))))
+
 (provide 'fill-tests)
 
 ;;; fill-tests.el ends here
-- 
2.49.0


--=-=-=--

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bug#78561; Package emacs. Full text available.

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From: Roi Martin <jroi.martin@HIDDEN>
To: Eli Zaretskii <eliz@HIDDEN>
Subject: Re: bug#78561: [PATCH] Add semantic linefeed support for paragraph
 filling
In-Reply-To: <864ixa17s8.fsf@HIDDEN>
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 <87msb2432u.fsf@HIDDEN> <864ixa17s8.fsf@HIDDEN>
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Eli Zaretskii <eliz@HIDDEN> writes:

>> From: Roi Martin <jroi.martin@HIDDEN>
>> Cc: 78561 <at> debbugs.gnu.org, mbork@HIDDEN, monnier@HIDDEN
>> Date: Sat, 24 May 2025 14:15:37 +0200
>> 
>> Eli Zaretskii <eliz@HIDDEN> writes:
>> 
>> > This explanation of what is "semantic linefeeds" is a good starting
>> > point, but it is not enough.  For starters, "ensures" hints but
>> > doesn't say explicitly that if there's no newline there, it is
>> > inserted.  Also, I think a URL to at least one site explaining what
>> > "semantic linefeeds" are should be in the doc string.
>> 
>> I would prefer to avoid depending on external URLs to explain the
>> concept.
>
> Since the concept came from outside, why not?
>
>> I'd link to an external reference if, for instance, this
>> feature was backed by an standard located in a well-known site
>> (e.g. IETF RFCs).  In this case, the concept is quite simple and I agree
>> with Stefan in that we can provide our own interpretation in the manual
>> and link to the Info node from the doc string.
>
> There's no contradiction: we could describe this in our documentation
> and also mention the external references.  We do that, for example,
> for Unicode-related features.

OK.  I'll update the patch accordingly.

>> >> +	  (when (and (> (point) (line-beginning-position))
>> >> +		     (< (point) (line-end-position)))
>> >> +	    (delete-horizontal-space)
>> >> +	    (newline)
>> >
>> > Are you sure 'newline' is the right function to call here?  It doesn't
>> > just insert the newline character, at least not in all the cases.
>> > Perhaps inserting a literal newline character is better?
>> 
>> The reason behind using 'newline' is to support documents that follow
>> other conventions to represent newlines (e.g. '\r\n' or '\r').  Does it
>> make sense?  Is this the right approach?
>
> In Emacs, there's only one "newline convention", the one that uses the
> newline (LFD) character.  The different en d-of-line conventions are
> supported during I/O: we "encode" newlines as CR-LF pair for Windows,
> for example, when saving buffers to files, and "decode" CR-LF back
> into a single newline when reading files into buffers.

Got it.  Thanks a lot for the explanation.  That simplifies things a
lot.

> By contrast, the 'newline' function does other things, in addition to
> inserting the newline character; see its documentation for the
> details.  It seems to me that some of those additional actions is not
> something this feature will want, because this feature is _only_ about
> where to break text into physical lines.

You are right.  I replaced it with

  (insert "\n")

Thanks!

Information forwarded to bug-gnu-emacs@HIDDEN:
bug#78561; Package emacs. Full text available.

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Subject: Re: bug#78561: [PATCH] Add semantic linefeed support for paragraph
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> From: Roi Martin <jroi.martin@HIDDEN>
> Cc: 78561 <at> debbugs.gnu.org, mbork@HIDDEN, monnier@HIDDEN
> Date: Sat, 24 May 2025 14:15:37 +0200
> 
> Eli Zaretskii <eliz@HIDDEN> writes:
> 
> > This explanation of what is "semantic linefeeds" is a good starting
> > point, but it is not enough.  For starters, "ensures" hints but
> > doesn't say explicitly that if there's no newline there, it is
> > inserted.  Also, I think a URL to at least one site explaining what
> > "semantic linefeeds" are should be in the doc string.
> 
> I would prefer to avoid depending on external URLs to explain the
> concept.

Since the concept came from outside, why not?

> I'd link to an external reference if, for instance, this
> feature was backed by an standard located in a well-known site
> (e.g. IETF RFCs).  In this case, the concept is quite simple and I agree
> with Stefan in that we can provide our own interpretation in the manual
> and link to the Info node from the doc string.

There's no contradiction: we could describe this in our documentation
and also mention the external references.  We do that, for example,
for Unicode-related features.

> >> +	  (when (and (> (point) (line-beginning-position))
> >> +		     (< (point) (line-end-position)))
> >> +	    (delete-horizontal-space)
> >> +	    (newline)
> >
> > Are you sure 'newline' is the right function to call here?  It doesn't
> > just insert the newline character, at least not in all the cases.
> > Perhaps inserting a literal newline character is better?
> 
> The reason behind using 'newline' is to support documents that follow
> other conventions to represent newlines (e.g. '\r\n' or '\r').  Does it
> make sense?  Is this the right approach?

In Emacs, there's only one "newline convention", the one that uses the
newline (LFD) character.  The different en d-of-line conventions are
supported during I/O: we "encode" newlines as CR-LF pair for Windows,
for example, when saving buffers to files, and "decode" CR-LF back
into a single newline when reading files into buffers.

By contrast, the 'newline' function does other things, in addition to
inserting the newline character; see its documentation for the
details.  It seems to me that some of those additional actions is not
something this feature will want, because this feature is _only_ about
where to break text into physical lines.

Information forwarded to bug-gnu-emacs@HIDDEN:
bug#78561; Package emacs. Full text available.

Message received at 78561 <at> debbugs.gnu.org:

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From: Roi Martin <jroi.martin@HIDDEN>
To: Eli Zaretskii <eliz@HIDDEN>
Subject: Re: bug#78561: [PATCH] Add semantic linefeed support for paragraph
 filling
In-Reply-To: <86ldqn4m54.fsf@HIDDEN>
References: <87jz67tzrp.fsf@HIDDEN> <86ldqn4m54.fsf@HIDDEN>
Date: Sat, 24 May 2025 14:15:37 +0200
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Eli Zaretskii <eliz@HIDDEN> writes:

>> +(defun fill-paragraph-semlf (&optional justify)
>> +  "Fill paragraph at or after point using semantic linefeeds.
>> +
>> +This function ensures that a newline character follows every
>> +sentence, as punctuated by a period (.), exclamation mark (!), or
>> +question mark (?).
>
> This explanation of what is "semantic linefeeds" is a good starting
> point, but it is not enough.  For starters, "ensures" hints but
> doesn't say explicitly that if there's no newline there, it is
> inserted.  Also, I think a URL to at least one site explaining what
> "semantic linefeeds" are should be in the doc string.

I would prefer to avoid depending on external URLs to explain the
concept.  I'd link to an external reference if, for instance, this
feature was backed by an standard located in a well-known site
(e.g. IETF RFCs).  In this case, the concept is quite simple and I agree
with Stefan in that we can provide our own interpretation in the manual
and link to the Info node from the doc string.  If you prefer to avoid
changing the manual until this is well tested, then we can provide a
more detailed explanation in the doc string itself.  What do you think?

>> +	  (when (and (> (point) (line-beginning-position))
>> +		     (< (point) (line-end-position)))
>> +	    (delete-horizontal-space)
>> +	    (newline)
>
> Are you sure 'newline' is the right function to call here?  It doesn't
> just insert the newline character, at least not in all the cases.
> Perhaps inserting a literal newline character is better?

The reason behind using 'newline' is to support documents that follow
other conventions to represent newlines (e.g. '\r\n' or '\r').  Does it
make sense?  Is this the right approach?

Information forwarded to bug-gnu-emacs@HIDDEN:
bug#78561; Package emacs. Full text available.

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From: Stefan Monnier <monnier@HIDDEN>
To: Roi Martin <jroi.martin@HIDDEN>
Subject: Re: bug#78561: [PATCH] Add semantic linefeed support for paragraph
 filling
In-Reply-To: <87jz67tzrp.fsf@HIDDEN>
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> Given that this is a first version, I have not added any reference to
> the manuals.  If you think it makes sense, please let me know and I'll
> modify the patch accordingly.

Maybe a short version of the explanation you give below would be good to
have in the manual (tho Eli suggests a URL instead, so maybe that's
good enough?).

> +(defun fill-paragraph-semlf (&optional justify)
> +  "Fill paragraph at or after point using semantic linefeeds.
> +
> +This function ensures that a newline character follows every
> +sentence, as punctuated by a period (.), exclamation mark (!), or
> +question mark (?).

This seems inaccurate: it just uses whichever definition of sentence is
used by `forward-sentence`, so it may ignore some of those chars or pay
attention to others.

> +If JUSTIFY is non-nil (interactively, with prefix argument), justify as
> +well.  If `sentence-end-double-space' is non-nil, then period followed
> +by one space does not end a sentence, so don't break a line there.  The
> +variable `fill-column' controls the width for filling."

I'd move the "The" to the last line.  =F0=9F=99=82

> +  (interactive "P")
> +  (save-excursion
> +    (let ((end (progn
> +		 (fill-forward-paragraph 1)
> +		 (backward-word)
> +		 (end-of-line)
> +		 (point)))
> +	  (start (progn
> +		   (fill-forward-paragraph -1)
> +		   (forward-word)
> +		   (beginning-of-line)
> +		   (point)))
> +	  pfx)
> +      (with-restriction start end
> +	(let ((fill-column (point-max)))
> +	  (setq pfx (or (fill-region-as-paragraph (point-min) (point-max)) "")))
> +	(goto-char (point-min))
> +	(while (not (eobp))
> +	  (let ((fill-prefix pfx))
> +	    (fill-region-as-paragraph (point)
> +				      (progn (forward-sentence) (point))
> +				      justify))
> +	  (when (and (> (point) (line-beginning-position))
> +		     (< (point) (line-end-position)))
> +	    (delete-horizontal-space)
> +	    (newline)
> +	    (insert pfx))))))
> +  t)

Please try and separate it into a `fill-region-semlf` function and then
another one which applies it to a paragraph, so that it can also be used
to fill a specific user-specified region (or the whole buffer).


        Stefan

Information forwarded to bug-gnu-emacs@HIDDEN:
bug#78561; Package emacs. Full text available.

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From: Eli Zaretskii <eliz@HIDDEN>
To: Roi Martin <jroi.martin@HIDDEN>
In-Reply-To: <87jz67tzrp.fsf@HIDDEN> (message from Roi Martin on Fri, 23
 May 2025 11:58:02 +0200)
Subject: Re: bug#78561: [PATCH] Add semantic linefeed support for paragraph
 filling
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> Cc: Marcin Borkowski <mbork@HIDDEN>
> From: Roi Martin <jroi.martin@HIDDEN>
> Date: Fri, 23 May 2025 11:58:02 +0200
> 
> This patch adds semantic linefeed support for paragraph filling.  The
> functionality has been discussed in the emacs-devel mailing list in the
> following threads:
> 
> - Fill paragraph using semantic linefeeds: https://lists.gnu.org/archive/html/emacs-devel/2025-03/msg00035.html
> - [GNU ELPA] New package: semlf: https://lists.gnu.org/archive/html/emacs-devel/2025-03/msg00702.html
> 
> In the second thread we agreed on sending a patch to core instead of
> adding a new package to GNU ELPA.
> 
> Given that this is a first version, I have not added any reference to
> the manuals.  If you think it makes sense, please let me know and I'll
> modify the patch accordingly.
> 
> What follows is a detailed explanation of the term semantic linefeeds,
> so we have all the information in one single place.
> 
> The term "semantic linefeeds" or "semantic line breaks" refers to a set
> of conventions for using insensitive vertical whitespace to structure
> prose along semantic boundaries.
> 
> The concept was first introduced by Brian Kernighan in "UNIX for
> Beginners" [1] in October 1974.
> 
>   Hints for Preparing Documents
>   
>   Most documents go through several versions (always more than you
>   expected) before they are finally finished.  Accordingly, you should
>   do whatever possible to make the job of changing them easy.
>   
>   First, when you do the purely mechanical operations of typing, type so
>   subsequent editing will be easy.  Start each sentence on a new line.
>   Make lines short, and break lines at natural places, such as after
>   commas and semicolons, rather than randomly.  Since most people change
>   documents by rewriting phrases and adding, deleting and rearranging
>   sentences, these precautions simplify any editing you have to do
>   later.
> 
> Semantic linefeeds are usually used with markup languages that are not
> sensitive to newlines when exported to a different format (e.g. Org,
> Texinfo, Markdown).
> 
> Let's say that we have the following paragraph in an Org document:
> 
>   Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod
>   tempor.  Incididunt ut labore et dolore magna aliqua.  Ut enim ad minim
>   veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea
>   commodo consequat.
> 
> After filling the paragraph using semantic linefeeds, the result is:
> 
>   Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod
>   tempor.
>   Incididunt ut labore et dolore magna aliqua.
>   Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi
>   ut aliquip ex ea commodo consequat.
> 
> However, when exported, in both cases the result is:
> 
>   Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod
>   tempor.  Incididunt ut labore et dolore magna aliqua.  Ut enim ad minim
>   veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea
>   commodo consequat.
> 
> So, what are the benefits?
> 
> One of the greatest benefits is that semantic linefeeds are "diff
> friendly".
> 
> For example,
> 
>   -Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod
>   -tempor.  Incididunt ut labore et dolore magna aliqua.  Ut enim ad minim
>   -veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea
>   -commodo consequat.
>   +Lorem ipsum dolor sit amet, XXXXX consectetur adipiscing elit, sed do
>   +eiusmod tempor.  Incididunt ut labore et dolore magna aliqua.  Ut enim
>   +ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut
>   +aliquip ex ea commodo consequat.
> 
> Versus,
> 
>   -Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod
>   -tempor.
>   +Lorem ipsum dolor sit amet, XXXXX consectetur adipiscing elit, sed do
>   +eiusmod tempor.
>    Incididunt ut labore et dolore magna aliqua.
>    Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi
>    ut aliquip ex ea commodo consequat.
> 
> Semantic linefeeds make easier to spot that the word "XXXXX" was added
> in the first line.
> 
> Also, they are convenient during code reviews.  Shorter diffs and
> separating "ideas" with newlines allow to be more accurate when adding
> comments.
> 
> The site "Semantic Line Breaks" [2] by Mattt and the blog post "Semantic
> Linefeeds" [3] by Brandon Rhodes are both excellent references.
> 
> [1] https://web.archive.org/web/20130108163017if_/http://miffy.tom-yam.or.jp:80/2238/ref/beg.pdf
> [2] https://sembr.org/
> [3] https://rhodesmill.org/brandon/2012/one-sentence-per-line/

Thanks.

> +(defun fill-paragraph-semlf (&optional justify)
> +  "Fill paragraph at or after point using semantic linefeeds.
> +
> +This function ensures that a newline character follows every
> +sentence, as punctuated by a period (.), exclamation mark (!), or
> +question mark (?).

This explanation of what is "semantic linefeeds" is a good starting
point, but it is not enough.  For starters, "ensures" hints but
doesn't say explicitly that if there's no newline there, it is
inserted.  Also, I think a URL to at least one site explaining what
"semantic linefeeds" are should be in the doc string.

> +	  (when (and (> (point) (line-beginning-position))
> +		     (< (point) (line-end-position)))
> +	    (delete-horizontal-space)
> +	    (newline)

Are you sure 'newline' is the right function to call here?  It doesn't
just insert the newline character, at least not in all the cases.
Perhaps inserting a literal newline character is better?

Information forwarded to bug-gnu-emacs@HIDDEN:
bug#78561; Package emacs. Full text available.

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From: Roi Martin <jroi.martin@HIDDEN>
To: bug-gnu-emacs@HIDDEN
Subject: [PATCH] Add semantic linefeed support for paragraph filling
X-Debbugs-Cc: Marcin Borkowski <mbork@HIDDEN>
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 Content preview:  Tags: patch This patch adds semantic linefeed support for
 paragraph filling. The functionality has been discussed in the emacs-devel
 mailing list in the following threads: - Fill paragraph using semantic
 linefeeds:
 https://lists.gnu.org/archive/html/emacs-devel/2025-03/msg00035.html - [GNU
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--=-=-=
Content-Type: text/plain

Tags: patch

This patch adds semantic linefeed support for paragraph filling.  The
functionality has been discussed in the emacs-devel mailing list in the
following threads:

- Fill paragraph using semantic linefeeds: https://lists.gnu.org/archive/html/emacs-devel/2025-03/msg00035.html
- [GNU ELPA] New package: semlf: https://lists.gnu.org/archive/html/emacs-devel/2025-03/msg00702.html

In the second thread we agreed on sending a patch to core instead of
adding a new package to GNU ELPA.

Given that this is a first version, I have not added any reference to
the manuals.  If you think it makes sense, please let me know and I'll
modify the patch accordingly.

What follows is a detailed explanation of the term semantic linefeeds,
so we have all the information in one single place.

The term "semantic linefeeds" or "semantic line breaks" refers to a set
of conventions for using insensitive vertical whitespace to structure
prose along semantic boundaries.

The concept was first introduced by Brian Kernighan in "UNIX for
Beginners" [1] in October 1974.

  Hints for Preparing Documents
  
  Most documents go through several versions (always more than you
  expected) before they are finally finished.  Accordingly, you should
  do whatever possible to make the job of changing them easy.
  
  First, when you do the purely mechanical operations of typing, type so
  subsequent editing will be easy.  Start each sentence on a new line.
  Make lines short, and break lines at natural places, such as after
  commas and semicolons, rather than randomly.  Since most people change
  documents by rewriting phrases and adding, deleting and rearranging
  sentences, these precautions simplify any editing you have to do
  later.

Semantic linefeeds are usually used with markup languages that are not
sensitive to newlines when exported to a different format (e.g. Org,
Texinfo, Markdown).

Let's say that we have the following paragraph in an Org document:

  Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod
  tempor.  Incididunt ut labore et dolore magna aliqua.  Ut enim ad minim
  veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea
  commodo consequat.

After filling the paragraph using semantic linefeeds, the result is:

  Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod
  tempor.
  Incididunt ut labore et dolore magna aliqua.
  Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi
  ut aliquip ex ea commodo consequat.

However, when exported, in both cases the result is:

  Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod
  tempor.  Incididunt ut labore et dolore magna aliqua.  Ut enim ad minim
  veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea
  commodo consequat.

So, what are the benefits?

One of the greatest benefits is that semantic linefeeds are "diff
friendly".

For example,

  -Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod
  -tempor.  Incididunt ut labore et dolore magna aliqua.  Ut enim ad minim
  -veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea
  -commodo consequat.
  +Lorem ipsum dolor sit amet, XXXXX consectetur adipiscing elit, sed do
  +eiusmod tempor.  Incididunt ut labore et dolore magna aliqua.  Ut enim
  +ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut
  +aliquip ex ea commodo consequat.

Versus,

  -Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod
  -tempor.
  +Lorem ipsum dolor sit amet, XXXXX consectetur adipiscing elit, sed do
  +eiusmod tempor.
   Incididunt ut labore et dolore magna aliqua.
   Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi
   ut aliquip ex ea commodo consequat.

Semantic linefeeds make easier to spot that the word "XXXXX" was added
in the first line.

Also, they are convenient during code reviews.  Shorter diffs and
separating "ideas" with newlines allow to be more accurate when adding
comments.

The site "Semantic Line Breaks" [2] by Mattt and the blog post "Semantic
Linefeeds" [3] by Brandon Rhodes are both excellent references.

[1] https://web.archive.org/web/20130108163017if_/http://miffy.tom-yam.or.jp:80/2238/ref/beg.pdf
[2] https://sembr.org/
[3] https://rhodesmill.org/brandon/2012/one-sentence-per-line/


--=-=-=
Content-Type: text/patch
Content-Disposition: attachment;
 filename=0001-Add-semantic-linefeed-support-for-paragraph-filling.patch

From 8faa17e5ddc8156a6f9f18965bb34e477d5d8b1d Mon Sep 17 00:00:00 2001
From: Roi Martin <jroi.martin@HIDDEN>
Date: Fri, 21 Mar 2025 14:22:46 +0100
Subject: [PATCH] Add semantic linefeed support for paragraph filling

* lisp/textmodes/fill.el (fill-paragraph-semlf): Add function to fill
paragraph using semantic linefeeds.
* test/lisp/textmodes/fill-tests.el (fill-test-fill-paragraph-semlf)
(fill-test-fill-paragraph-semlf-fill-paragraph-function)
(fill-test-fill-paragraph-semlf-justify)
(fill-test-fill-paragraph-semlf-sentence-end-double-space)
(fill-test-fill-paragraph-semlf-fill-column)
(fill-test-fill-paragraph-semlf-punctuation-marks)
(fill-test-fill-paragraph-semlf-twice)
(fill-test-fill-paragraph-semlf-fill-prefix)
(fill-test-fill-paragraph-semlf-indented-block)
(fill-test-fill-paragraph-semlf-emacs-lisp-mode)
(fill-test-fill-paragraph-semlf-c-mode)
(fill-test-fill-paragraph-semlf-org-mode)
(fill-test-fill-paragraph-semlf-markdown-mode): Add tests.
* test/lisp/textmodes/fill-resources/semlf-c-mode.erts:
* test/lisp/textmodes/fill-resources/semlf-emacs-lisp-mode.erts:
* test/lisp/textmodes/fill-resources/semlf-fill-column.erts:
* test/lisp/textmodes/fill-resources/semlf-fill-paragraph-function.erts:
* test/lisp/textmodes/fill-resources/semlf-fill-prefix.erts:
* test/lisp/textmodes/fill-resources/semlf-indented-block.erts:
* test/lisp/textmodes/fill-resources/semlf-justify.erts:
* test/lisp/textmodes/fill-resources/semlf-markdown-mode.erts:
* test/lisp/textmodes/fill-resources/semlf-org-mode.erts:
* test/lisp/textmodes/fill-resources/semlf-punctuation-marks.erts:
* test/lisp/textmodes/fill-resources/semlf-sentence-end-double-space.erts:
* test/lisp/textmodes/fill-resources/semlf-twice.erts:
* test/lisp/textmodes/fill-resources/semlf.erts: Add test data.
---
 lisp/textmodes/fill.el                        |  40 ++++
 .../fill-resources/semlf-c-mode.erts          | 183 ++++++++++++++++++
 .../fill-resources/semlf-emacs-lisp-mode.erts |  87 +++++++++
 .../fill-resources/semlf-fill-column.erts     |  15 ++
 .../semlf-fill-paragraph-function.erts        |  12 ++
 .../fill-resources/semlf-fill-prefix.erts     |  35 ++++
 .../fill-resources/semlf-indented-block.erts  |  31 +++
 .../fill-resources/semlf-justify.erts         |  12 ++
 .../fill-resources/semlf-markdown-mode.erts   | 129 ++++++++++++
 .../fill-resources/semlf-org-mode.erts        | 122 ++++++++++++
 .../semlf-punctuation-marks.erts              |  13 ++
 .../semlf-sentence-end-double-space.erts      |  13 ++
 .../textmodes/fill-resources/semlf-twice.erts |  12 ++
 test/lisp/textmodes/fill-resources/semlf.erts |  88 +++++++++
 test/lisp/textmodes/fill-tests.el             |  90 +++++++++
 15 files changed, 882 insertions(+)
 create mode 100644 test/lisp/textmodes/fill-resources/semlf-c-mode.erts
 create mode 100644 test/lisp/textmodes/fill-resources/semlf-emacs-lisp-mode.erts
 create mode 100644 test/lisp/textmodes/fill-resources/semlf-fill-column.erts
 create mode 100644 test/lisp/textmodes/fill-resources/semlf-fill-paragraph-function.erts
 create mode 100644 test/lisp/textmodes/fill-resources/semlf-fill-prefix.erts
 create mode 100644 test/lisp/textmodes/fill-resources/semlf-indented-block.erts
 create mode 100644 test/lisp/textmodes/fill-resources/semlf-justify.erts
 create mode 100644 test/lisp/textmodes/fill-resources/semlf-markdown-mode.erts
 create mode 100644 test/lisp/textmodes/fill-resources/semlf-org-mode.erts
 create mode 100644 test/lisp/textmodes/fill-resources/semlf-punctuation-marks.erts
 create mode 100644 test/lisp/textmodes/fill-resources/semlf-sentence-end-double-space.erts
 create mode 100644 test/lisp/textmodes/fill-resources/semlf-twice.erts
 create mode 100644 test/lisp/textmodes/fill-resources/semlf.erts

diff --git a/lisp/textmodes/fill.el b/lisp/textmodes/fill.el
index e38d030734fb..676c1657b666 100644
--- a/lisp/textmodes/fill.el
+++ b/lisp/textmodes/fill.el
@@ -1583,4 +1583,44 @@ fill-individual-paragraphs-citation
 	"")
     string))
 
+(defun fill-paragraph-semlf (&optional justify)
+  "Fill paragraph at or after point using semantic linefeeds.
+
+This function ensures that a newline character follows every
+sentence, as punctuated by a period (.), exclamation mark (!), or
+question mark (?).
+
+If JUSTIFY is non-nil (interactively, with prefix argument), justify as
+well.  If `sentence-end-double-space' is non-nil, then period followed
+by one space does not end a sentence, so don't break a line there.  The
+variable `fill-column' controls the width for filling."
+  (interactive "P")
+  (save-excursion
+    (let ((end (progn
+		 (fill-forward-paragraph 1)
+		 (backward-word)
+		 (end-of-line)
+		 (point)))
+	  (start (progn
+		   (fill-forward-paragraph -1)
+		   (forward-word)
+		   (beginning-of-line)
+		   (point)))
+	  pfx)
+      (with-restriction start end
+	(let ((fill-column (point-max)))
+	  (setq pfx (or (fill-region-as-paragraph (point-min) (point-max)) "")))
+	(goto-char (point-min))
+	(while (not (eobp))
+	  (let ((fill-prefix pfx))
+	    (fill-region-as-paragraph (point)
+				      (progn (forward-sentence) (point))
+				      justify))
+	  (when (and (> (point) (line-beginning-position))
+		     (< (point) (line-end-position)))
+	    (delete-horizontal-space)
+	    (newline)
+	    (insert pfx))))))
+  t)
+
 ;;; fill.el ends here
diff --git a/test/lisp/textmodes/fill-resources/semlf-c-mode.erts b/test/lisp/textmodes/fill-resources/semlf-c-mode.erts
new file mode 100644
index 000000000000..a28eb68cfc6a
--- /dev/null
+++ b/test/lisp/textmodes/fill-resources/semlf-c-mode.erts
@@ -0,0 +1,183 @@
+Point-Char: |
+
+Name: c-mode - single-line
+
+=-=
+// Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do
+// eiusmod tempor.  Incididunt ut labore et dolore magna aliqua. Ut enim
+// ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut.
+=-=
+// Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do
+// eiusmod tempor.
+// Incididunt ut labore et dolore magna aliqua. Ut enim ad minim
+// veniam, quis nostrud exercitation ullamco laboris nisi ut.
+=-=-=
+
+Name: c-mode - single-line - fill-prefix - marker
+
+=-=
+// - Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor.  Incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut.
+// - Aliquip ex ea commodo consequat.  Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur.
+// - Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.
+=-=
+// - Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do
+// - eiusmod tempor.
+// - Incididunt ut labore et dolore magna aliqua. Ut enim ad minim
+// - veniam, quis nostrud exercitation ullamco laboris nisi ut.
+// - Aliquip ex ea commodo consequat.
+// - Duis aute irure dolor in reprehenderit in voluptate velit esse
+// - cillum dolore eu fugiat nulla pariatur.
+// - Excepteur sint occaecat cupidatat non proident, sunt in culpa qui
+// - officia deserunt mollit anim id est laborum.
+=-=-=
+
+Name: c-mode - single-line - fill-prefix - whitespace
+
+=-=
+// - Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor.  Incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut.
+//   Aliquip ex ea commodo consequat.  Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur.
+//   Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.
+=-=
+// - Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do
+//   eiusmod tempor.
+//   Incididunt ut labore et dolore magna aliqua. Ut enim ad minim
+//   veniam, quis nostrud exercitation ullamco laboris nisi ut.
+//   Aliquip ex ea commodo consequat.
+//   Duis aute irure dolor in reprehenderit in voluptate velit esse
+//   cillum dolore eu fugiat nulla pariatur.
+//   Excepteur sint occaecat cupidatat non proident, sunt in culpa qui
+//   officia deserunt mollit anim id est laborum.
+=-=-=
+
+Name: c-mode - single-line - indented block
+
+=-=
+// Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do
+// eiusmod tempor.  Incididunt ut labore et dolore magna aliqua. Ut
+// enim ad minim veniam, quis nostrud exercitation ullamco laboris
+// nisi ut.
+//
+// 	|Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed
+// 	do eiusmod tempor.  Incididunt ut labore et dolore magna
+// 	aliqua. Ut enim ad minim veniam, quis nostrud exercitation
+// 	ullamco laboris nisi ut.
+//
+// Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do
+// eiusmod tempor.  Incididunt ut labore et dolore magna aliqua. Ut
+// enim ad minim veniam, quis nostrud exercitation ullamco laboris
+// nisi ut.
+=-=
+// Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do
+// eiusmod tempor.  Incididunt ut labore et dolore magna aliqua. Ut
+// enim ad minim veniam, quis nostrud exercitation ullamco laboris
+// nisi ut.
+//
+// 	Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed
+// 	do eiusmod tempor.
+// 	Incididunt ut labore et dolore magna aliqua. Ut enim ad minim
+// 	veniam, quis nostrud exercitation ullamco laboris nisi ut.
+//
+// Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do
+// eiusmod tempor.  Incididunt ut labore et dolore magna aliqua. Ut
+// enim ad minim veniam, quis nostrud exercitation ullamco laboris
+// nisi ut.
+=-=-=
+
+Name: c-mode - multi-line
+
+=-=
+/*
+ * Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do
+ * eiusmod tempor.  Incididunt ut labore et dolore magna aliqua. Ut enim
+ * ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut.
+ */
+=-=
+/*
+ * Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do
+ * eiusmod tempor.
+ * Incididunt ut labore et dolore magna aliqua. Ut enim ad minim
+ * veniam, quis nostrud exercitation ullamco laboris nisi ut.
+ */
+=-=-=
+
+Name: c-mode - multi-line - fill-prefix - marker
+
+=-=
+/*
+ * - Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor.  Incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut.
+ * - Aliquip ex ea commodo consequat.  Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur.
+ * - Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.
+ */
+=-=
+/*
+ * - Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do
+ * - eiusmod tempor.
+ * - Incididunt ut labore et dolore magna aliqua. Ut enim ad minim
+ * - veniam, quis nostrud exercitation ullamco laboris nisi ut.
+ * - Aliquip ex ea commodo consequat.
+ * - Duis aute irure dolor in reprehenderit in voluptate velit esse
+ * - cillum dolore eu fugiat nulla pariatur.
+ * - Excepteur sint occaecat cupidatat non proident, sunt in culpa qui
+ * - officia deserunt mollit anim id est laborum.
+ */
+=-=-=
+
+Name: c-mode - multi-line - fill-prefix - whitespace
+
+=-=
+/*
+ * - Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor.  Incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut.
+ *   Aliquip ex ea commodo consequat.  Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur.
+ *   Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.
+ */
+=-=
+/*
+ * - Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do
+ *   eiusmod tempor.
+ *   Incididunt ut labore et dolore magna aliqua. Ut enim ad minim
+ *   veniam, quis nostrud exercitation ullamco laboris nisi ut.
+ *   Aliquip ex ea commodo consequat.
+ *   Duis aute irure dolor in reprehenderit in voluptate velit esse
+ *   cillum dolore eu fugiat nulla pariatur.
+ *   Excepteur sint occaecat cupidatat non proident, sunt in culpa qui
+ *   officia deserunt mollit anim id est laborum.
+ */
+=-=-=
+
+Name: c-mode - multi-line - indented block
+
+=-=
+/*
+ * Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do
+ * eiusmod tempor.  Incididunt ut labore et dolore magna aliqua. Ut
+ * enim ad minim veniam, quis nostrud exercitation ullamco laboris
+ * nisi ut.
+ *
+ * 	|Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed
+ * 	do eiusmod tempor.  Incididunt ut labore et dolore magna
+ * 	aliqua. Ut enim ad minim veniam, quis nostrud exercitation
+ * 	ullamco laboris nisi ut.
+ *
+ * Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do
+ * eiusmod tempor.  Incididunt ut labore et dolore magna aliqua. Ut
+ * enim ad minim veniam, quis nostrud exercitation ullamco laboris
+ * nisi ut.
+ */
+=-=
+/*
+ * Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do
+ * eiusmod tempor.  Incididunt ut labore et dolore magna aliqua. Ut
+ * enim ad minim veniam, quis nostrud exercitation ullamco laboris
+ * nisi ut.
+ *
+ * 	Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed
+ * 	do eiusmod tempor.
+ * 	Incididunt ut labore et dolore magna aliqua. Ut enim ad minim
+ * 	veniam, quis nostrud exercitation ullamco laboris nisi ut.
+ *
+ * Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do
+ * eiusmod tempor.  Incididunt ut labore et dolore magna aliqua. Ut
+ * enim ad minim veniam, quis nostrud exercitation ullamco laboris
+ * nisi ut.
+ */
+=-=-=
diff --git a/test/lisp/textmodes/fill-resources/semlf-emacs-lisp-mode.erts b/test/lisp/textmodes/fill-resources/semlf-emacs-lisp-mode.erts
new file mode 100644
index 000000000000..fe71ee32c1aa
--- /dev/null
+++ b/test/lisp/textmodes/fill-resources/semlf-emacs-lisp-mode.erts
@@ -0,0 +1,87 @@
+Point-Char: |
+
+Name: emacs-lisp-mode
+
+=-=
+;; Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do
+;; eiusmod tempor.  Incididunt ut labore et dolore magna aliqua. Ut enim
+;; ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut.
+=-=
+;; Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do
+;; eiusmod tempor.
+;; Incididunt ut labore et dolore magna aliqua. Ut enim ad minim
+;; veniam, quis nostrud exercitation ullamco laboris nisi ut.
+=-=-=
+
+Name: emacs-lisp-mode - fill-prefix - marker
+
+=-=
+;; - Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor.  Incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut.
+;; - Aliquip ex ea commodo consequat.  Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur.
+;; - Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.
+=-=
+;; - Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do
+;; - eiusmod tempor.
+;; - Incididunt ut labore et dolore magna aliqua. Ut enim ad minim
+;; - veniam, quis nostrud exercitation ullamco laboris nisi ut.
+;; - Aliquip ex ea commodo consequat.
+;; - Duis aute irure dolor in reprehenderit in voluptate velit esse
+;; - cillum dolore eu fugiat nulla pariatur.
+;; - Excepteur sint occaecat cupidatat non proident, sunt in culpa qui
+;; - officia deserunt mollit anim id est laborum.
+=-=-=
+
+Name: emacs-lisp-mode - fill-prefix - whitespace
+
+=-=
+;; - Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor.  Incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut.
+;;   Aliquip ex ea commodo consequat.  Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur.
+;;   Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.
+=-=
+;; - Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do
+;;   eiusmod tempor.
+;;   Incididunt ut labore et dolore magna aliqua. Ut enim ad minim
+;;   veniam, quis nostrud exercitation ullamco laboris nisi ut.
+;;   Aliquip ex ea commodo consequat.
+;;   Duis aute irure dolor in reprehenderit in voluptate velit esse
+;;   cillum dolore eu fugiat nulla pariatur.
+;;   Excepteur sint occaecat cupidatat non proident, sunt in culpa qui
+;;   officia deserunt mollit anim id est laborum.
+=-=-=
+
+Name: emacs-lisp-mode - indented block
+
+The `fill-forward-paragraph' function jumps to the beginning/end of
+the comment.
+
+=-=
+;; Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do
+;; eiusmod tempor.  Incididunt ut labore et dolore magna aliqua. Ut
+;; enim ad minim veniam, quis nostrud exercitation ullamco laboris
+;; nisi ut.
+
+;; 	|Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed
+;; 	do eiusmod tempor.  Incididunt ut labore et dolore magna
+;; 	aliqua. Ut enim ad minim veniam, quis nostrud exercitation
+;; 	ullamco laboris nisi ut.
+
+;; Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do
+;; eiusmod tempor.  Incididunt ut labore et dolore magna aliqua. Ut
+;; enim ad minim veniam, quis nostrud exercitation ullamco laboris
+;; nisi ut.
+=-=
+;; Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do
+;; eiusmod tempor.  Incididunt ut labore et dolore magna aliqua. Ut
+;; enim ad minim veniam, quis nostrud exercitation ullamco laboris
+;; nisi ut.
+
+;; 	Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed
+;; 	do eiusmod tempor.
+;; 	Incididunt ut labore et dolore magna aliqua. Ut enim ad minim
+;; 	veniam, quis nostrud exercitation ullamco laboris nisi ut.
+
+;; Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do
+;; eiusmod tempor.  Incididunt ut labore et dolore magna aliqua. Ut
+;; enim ad minim veniam, quis nostrud exercitation ullamco laboris
+;; nisi ut.
+=-=-=
diff --git a/test/lisp/textmodes/fill-resources/semlf-fill-column.erts b/test/lisp/textmodes/fill-resources/semlf-fill-column.erts
new file mode 100644
index 000000000000..20db7b1f9c5b
--- /dev/null
+++ b/test/lisp/textmodes/fill-resources/semlf-fill-column.erts
@@ -0,0 +1,15 @@
+Name: fill-column
+
+=-=
+Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do
+eiusmod tempor.  Incididunt ut labore et dolore magna aliqua. Ut enim
+ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut.
+=-=
+Lorem ipsum dolor sit amet,
+consectetur adipiscing elit, sed do
+eiusmod tempor.
+Incididunt ut labore et dolore
+magna aliqua. Ut enim ad minim
+veniam, quis nostrud exercitation
+ullamco laboris nisi ut.
+=-=-=
diff --git a/test/lisp/textmodes/fill-resources/semlf-fill-paragraph-function.erts b/test/lisp/textmodes/fill-resources/semlf-fill-paragraph-function.erts
new file mode 100644
index 000000000000..467e7401cf50
--- /dev/null
+++ b/test/lisp/textmodes/fill-resources/semlf-fill-paragraph-function.erts
@@ -0,0 +1,12 @@
+Name: fill-paragraph-function
+
+=-=
+Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do
+eiusmod tempor.  Incididunt ut labore et dolore magna aliqua. Ut enim
+ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut.
+=-=
+Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do
+eiusmod tempor.
+Incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam,
+quis nostrud exercitation ullamco laboris nisi ut.
+=-=-=
diff --git a/test/lisp/textmodes/fill-resources/semlf-fill-prefix.erts b/test/lisp/textmodes/fill-resources/semlf-fill-prefix.erts
new file mode 100644
index 000000000000..e067eff69701
--- /dev/null
+++ b/test/lisp/textmodes/fill-resources/semlf-fill-prefix.erts
@@ -0,0 +1,35 @@
+Name: fill-prefix - marker
+
+=-=
+- Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor.  Incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut.
+- Aliquip ex ea commodo consequat.  Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur.
+- Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.
+=-=
+- Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do
+- eiusmod tempor.
+- Incididunt ut labore et dolore magna aliqua. Ut enim ad minim
+- veniam, quis nostrud exercitation ullamco laboris nisi ut.
+- Aliquip ex ea commodo consequat.
+- Duis aute irure dolor in reprehenderit in voluptate velit esse
+- cillum dolore eu fugiat nulla pariatur.
+- Excepteur sint occaecat cupidatat non proident, sunt in culpa qui
+- officia deserunt mollit anim id est laborum.
+=-=-=
+
+Name: fill-prefix - whitespace
+
+=-=
+- Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor.  Incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut.
+  Aliquip ex ea commodo consequat.  Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur.
+  Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.
+=-=
+- Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do
+  eiusmod tempor.
+  Incididunt ut labore et dolore magna aliqua. Ut enim ad minim
+  veniam, quis nostrud exercitation ullamco laboris nisi ut.
+  Aliquip ex ea commodo consequat.
+  Duis aute irure dolor in reprehenderit in voluptate velit esse
+  cillum dolore eu fugiat nulla pariatur.
+  Excepteur sint occaecat cupidatat non proident, sunt in culpa qui
+  officia deserunt mollit anim id est laborum.
+=-=-=
diff --git a/test/lisp/textmodes/fill-resources/semlf-indented-block.erts b/test/lisp/textmodes/fill-resources/semlf-indented-block.erts
new file mode 100644
index 000000000000..e483567c6ab3
--- /dev/null
+++ b/test/lisp/textmodes/fill-resources/semlf-indented-block.erts
@@ -0,0 +1,31 @@
+Point-Char: |
+
+Name: indented block
+
+=-=
+Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do
+eiusmod tempor.  Incididunt ut labore et dolore magna aliqua. Ut enim
+ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut.
+
+	|Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed
+	do eiusmod tempor.  Incididunt ut labore et dolore magna
+	aliqua. Ut enim ad minim veniam, quis nostrud exercitation
+	ullamco laboris nisi ut.
+
+Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do
+eiusmod tempor.  Incididunt ut labore et dolore magna aliqua. Ut enim
+ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut.
+=-=
+Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do
+eiusmod tempor.  Incididunt ut labore et dolore magna aliqua. Ut enim
+ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut.
+
+	Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed
+	do eiusmod tempor.
+	Incididunt ut labore et dolore magna aliqua. Ut enim ad minim
+	veniam, quis nostrud exercitation ullamco laboris nisi ut.
+
+Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do
+eiusmod tempor.  Incididunt ut labore et dolore magna aliqua. Ut enim
+ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut.
+=-=-=
diff --git a/test/lisp/textmodes/fill-resources/semlf-justify.erts b/test/lisp/textmodes/fill-resources/semlf-justify.erts
new file mode 100644
index 000000000000..3a951b7ce424
--- /dev/null
+++ b/test/lisp/textmodes/fill-resources/semlf-justify.erts
@@ -0,0 +1,12 @@
+Name: justify
+
+=-=
+Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do
+eiusmod tempor.  Incididunt ut labore et dolore magna aliqua. Ut enim
+ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut.
+=-=
+Lorem  ipsum  dolor sit  amet,  consectetur  adipiscing elit,  sed  do
+eiusmod tempor.
+Incididunt ut labore et dolore magna  aliqua. Ut enim ad minim veniam,
+quis nostrud exercitation ullamco laboris nisi ut.
+=-=-=
diff --git a/test/lisp/textmodes/fill-resources/semlf-markdown-mode.erts b/test/lisp/textmodes/fill-resources/semlf-markdown-mode.erts
new file mode 100644
index 000000000000..7257708c245d
--- /dev/null
+++ b/test/lisp/textmodes/fill-resources/semlf-markdown-mode.erts
@@ -0,0 +1,129 @@
+Point-Char: |
+
+Name: markdown-mode
+
+=-=
+Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do
+eiusmod tempor.  Incididunt ut labore et dolore magna aliqua. Ut enim
+ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut.
+=-=
+Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do
+eiusmod tempor.
+Incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam,
+quis nostrud exercitation ullamco laboris nisi ut.
+=-=-=
+
+Name: markdown-mode - list - one single-line item
+
+=-=
+- Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor.  Incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut.
+=-=
+- Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do
+  eiusmod tempor.
+  Incididunt ut labore et dolore magna aliqua. Ut enim ad minim
+  veniam, quis nostrud exercitation ullamco laboris nisi ut.
+=-=-=
+
+Name: markdown-mode - list - multiple single-line items
+
+=-=
+- Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor.  Incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut.
+- Aliquip ex ea commodo consequat.  Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur.
+- Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.
+=-=
+- Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do
+  eiusmod tempor.
+  Incididunt ut labore et dolore magna aliqua. Ut enim ad minim
+  veniam, quis nostrud exercitation ullamco laboris nisi ut.
+- Aliquip ex ea commodo consequat.  Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur.
+- Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.
+=-=-=
+
+Name: markdown-mode - list - one multi-line item
+
+=-=
+- Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do
+  eiusmod tempor.  Incididunt ut labore et dolore magna aliqua. Ut
+  enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi
+  ut.
+=-=
+- Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do
+  eiusmod tempor.
+  Incididunt ut labore et dolore magna aliqua. Ut enim ad minim
+  veniam, quis nostrud exercitation ullamco laboris nisi ut.
+=-=-=
+
+Name: markdown-mode - list - multiple multi-line items
+
+=-=
+- Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do
+  eiusmod tempor.  Incididunt ut labore et dolore magn a aliqua. Ut
+  enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi
+  ut.
+- Aliquip ex ea commodo consequat.  Duis aute irure dolor in
+  reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla
+  pariatur.
+- Excepteur sint occaecat cupidatat non proident, sunt in culpa qui
+  officia deserunt mollit anim id est laborum.
+=-=
+- Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do
+  eiusmod tempor.
+  Incididunt ut labore et dolore magn a aliqua. Ut enim ad minim
+  veniam, quis nostrud exercitation ullamco laboris nisi ut.
+- Aliquip ex ea commodo consequat.  Duis aute irure dolor in
+  reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla
+  pariatur.
+- Excepteur sint occaecat cupidatat non proident, sunt in culpa qui
+  officia deserunt mollit anim id est laborum.
+=-=-=
+
+Name: markdown-mode - list - short sentence in multi-line item
+
+=-=
+- Lorem ipsum dolor.  Sit amet, consectetur adipiscing elit, sed do
+  eiusmod tempor.  Incididunt ut labore et dolore magn a aliqua. Ut
+  enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi
+  ut.
+=-=
+- Lorem ipsum dolor.
+  Sit amet, consectetur adipiscing elit, sed do eiusmod tempor.
+  Incididunt ut labore et dolore magn a aliqua. Ut enim ad minim
+  veniam, quis nostrud exercitation ullamco laboris nisi ut.
+=-=-=
+
+Name: markdown-mode - indented block
+Skip: t
+
+TODO - In `markdown-mode', the `fill-forward-paragraph' function
+ignores code blocks.  We should reach out to the `markdown-mode'
+maintainer(s) to understand the reason for this and possibly suggest a
+change to this behavior.  This works as expected in
+`markdown-ts-mode'.
+
+=-=
+Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do
+eiusmod tempor.  Incididunt ut labore et dolore magna aliqua. Ut enim
+ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut.
+
+	|Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed
+	do eiusmod tempor.  Incididunt ut labore et dolore magna
+	aliqua. Ut enim ad minim veniam, quis nostrud exercitation
+	ullamco laboris nisi ut.
+
+Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do
+eiusmod tempor.  Incididunt ut labore et dolore magna aliqua. Ut enim
+ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut.
+=-=
+Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do
+eiusmod tempor.  Incididunt ut labore et dolore magna aliqua. Ut enim
+ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut.
+
+	Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed
+	do eiusmod tempor.
+	Incididunt ut labore et dolore magna aliqua. Ut enim ad minim
+	veniam, quis nostrud exercitation ullamco laboris nisi ut.
+
+Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do
+eiusmod tempor.  Incididunt ut labore et dolore magna aliqua. Ut enim
+ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut.
+=-=-=
diff --git a/test/lisp/textmodes/fill-resources/semlf-org-mode.erts b/test/lisp/textmodes/fill-resources/semlf-org-mode.erts
new file mode 100644
index 000000000000..81dd4841de94
--- /dev/null
+++ b/test/lisp/textmodes/fill-resources/semlf-org-mode.erts
@@ -0,0 +1,122 @@
+Point-Char: |
+
+Name: org-mode
+
+=-=
+Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do
+eiusmod tempor.  Incididunt ut labore et dolore magna aliqua. Ut enim
+ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut.
+=-=
+Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do
+eiusmod tempor.
+Incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam,
+quis nostrud exercitation ullamco laboris nisi ut.
+=-=-=
+
+Name: org-mode - list - one single-line item
+
+=-=
+- Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor.  Incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut.
+=-=
+- Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do
+  eiusmod tempor.
+  Incididunt ut labore et dolore magna aliqua. Ut enim ad minim
+  veniam, quis nostrud exercitation ullamco laboris nisi ut.
+=-=-=
+
+Name: org-mode - list - multiple single-line items
+
+=-=
+- Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor.  Incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut.
+- Aliquip ex ea commodo consequat.  Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur.
+- Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.
+=-=
+- Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do
+  eiusmod tempor.
+  Incididunt ut labore et dolore magna aliqua. Ut enim ad minim
+  veniam, quis nostrud exercitation ullamco laboris nisi ut.
+- Aliquip ex ea commodo consequat.  Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur.
+- Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.
+=-=-=
+
+Name: org-mode - list - one multi-line item
+
+=-=
+- Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do
+  eiusmod tempor.  Incididunt ut labore et dolore magna aliqua. Ut
+  enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi
+  ut.
+=-=
+- Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do
+  eiusmod tempor.
+  Incididunt ut labore et dolore magna aliqua. Ut enim ad minim
+  veniam, quis nostrud exercitation ullamco laboris nisi ut.
+=-=-=
+
+Name: org-mode - list - multiple multi-line items
+
+=-=
+- Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do
+  eiusmod tempor.  Incididunt ut labore et dolore magn a aliqua. Ut
+  enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi
+  ut.
+- Aliquip ex ea commodo consequat.  Duis aute irure dolor in
+  reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla
+  pariatur.
+- Excepteur sint occaecat cupidatat non proident, sunt in culpa qui
+  officia deserunt mollit anim id est laborum.
+=-=
+- Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do
+  eiusmod tempor.
+  Incididunt ut labore et dolore magn a aliqua. Ut enim ad minim
+  veniam, quis nostrud exercitation ullamco laboris nisi ut.
+- Aliquip ex ea commodo consequat.  Duis aute irure dolor in
+  reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla
+  pariatur.
+- Excepteur sint occaecat cupidatat non proident, sunt in culpa qui
+  officia deserunt mollit anim id est laborum.
+=-=-=
+
+Name: org-mode - list - short sentence in multi-line item
+
+=-=
+- Lorem ipsum dolor.  Sit amet, consectetur adipiscing elit, sed do
+  eiusmod tempor.  Incididunt ut labore et dolore magn a aliqua. Ut
+  enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi
+  ut.
+=-=
+- Lorem ipsum dolor.
+  Sit amet, consectetur adipiscing elit, sed do eiusmod tempor.
+  Incididunt ut labore et dolore magn a aliqua. Ut enim ad minim
+  veniam, quis nostrud exercitation ullamco laboris nisi ut.
+=-=-=
+
+Name: org-mode - indented block
+
+=-=
+Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do
+eiusmod tempor.  Incididunt ut labore et dolore magna aliqua. Ut enim
+ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut.
+
+	|Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed
+	do eiusmod tempor.  Incididunt ut labore et dolore magna
+	aliqua. Ut enim ad minim veniam, quis nostrud exercitation
+	ullamco laboris nisi ut.
+
+Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do
+eiusmod tempor.  Incididunt ut labore et dolore magna aliqua. Ut enim
+ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut.
+=-=
+Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do
+eiusmod tempor.  Incididunt ut labore et dolore magna aliqua. Ut enim
+ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut.
+
+	Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed
+	do eiusmod tempor.
+	Incididunt ut labore et dolore magna aliqua. Ut enim ad minim
+	veniam, quis nostrud exercitation ullamco laboris nisi ut.
+
+Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do
+eiusmod tempor.  Incididunt ut labore et dolore magna aliqua. Ut enim
+ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut.
+=-=-=
diff --git a/test/lisp/textmodes/fill-resources/semlf-punctuation-marks.erts b/test/lisp/textmodes/fill-resources/semlf-punctuation-marks.erts
new file mode 100644
index 000000000000..5346216e9f9c
--- /dev/null
+++ b/test/lisp/textmodes/fill-resources/semlf-punctuation-marks.erts
@@ -0,0 +1,13 @@
+Name: punctuation marks
+
+=-=
+Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do
+eiusmod tempor.  Incididunt ut labore et dolore magna aliqua!  Ut enim
+ad minim veniam?  Quis nostrud exercitation ullamco laboris nisi ut.
+=-=
+Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do
+eiusmod tempor.
+Incididunt ut labore et dolore magna aliqua!
+Ut enim ad minim veniam?
+Quis nostrud exercitation ullamco laboris nisi ut.
+=-=-=
diff --git a/test/lisp/textmodes/fill-resources/semlf-sentence-end-double-space.erts b/test/lisp/textmodes/fill-resources/semlf-sentence-end-double-space.erts
new file mode 100644
index 000000000000..a01beed0f665
--- /dev/null
+++ b/test/lisp/textmodes/fill-resources/semlf-sentence-end-double-space.erts
@@ -0,0 +1,13 @@
+Name: sentence-end-double-space
+
+=-=
+Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do
+eiusmod tempor.  Incididunt ut labore et dolore magna aliqua. Ut enim
+ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut.
+=-=
+Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do
+eiusmod tempor.
+Incididunt ut labore et dolore magna aliqua.
+Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris
+nisi ut.
+=-=-=
diff --git a/test/lisp/textmodes/fill-resources/semlf-twice.erts b/test/lisp/textmodes/fill-resources/semlf-twice.erts
new file mode 100644
index 000000000000..862dda6e27eb
--- /dev/null
+++ b/test/lisp/textmodes/fill-resources/semlf-twice.erts
@@ -0,0 +1,12 @@
+Name: fill twice
+
+=-=
+Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do
+eiusmod tempor.  Incididunt ut labore et dolore magna aliqua. Ut enim
+ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut.
+=-=
+Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do
+eiusmod tempor.
+Incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam,
+quis nostrud exercitation ullamco laboris nisi ut.
+=-=-=
diff --git a/test/lisp/textmodes/fill-resources/semlf.erts b/test/lisp/textmodes/fill-resources/semlf.erts
new file mode 100644
index 000000000000..f3e331cd9381
--- /dev/null
+++ b/test/lisp/textmodes/fill-resources/semlf.erts
@@ -0,0 +1,88 @@
+Point-Char: |
+
+Name: beginning of buffer
+
+=-=
+|Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do
+eiusmod tempor.  Incididunt ut labore et dolore magna aliqua. Ut enim
+ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut.
+
+Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do
+eiusmod tempor.  Incididunt ut labore et dolore magna aliqua. Ut enim
+ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut.
+
+Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do
+eiusmod tempor.  Incididunt ut labore et dolore magna aliqua. Ut enim
+ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut.
+=-=
+Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do
+eiusmod tempor.
+Incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam,
+quis nostrud exercitation ullamco laboris nisi ut.
+
+Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do
+eiusmod tempor.  Incididunt ut labore et dolore magna aliqua. Ut enim
+ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut.
+
+Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do
+eiusmod tempor.  Incididunt ut labore et dolore magna aliqua. Ut enim
+ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut.
+=-=-=
+
+Name: second paragraph
+
+=-=
+Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do
+eiusmod tempor.  Incididunt ut labore et dolore magna aliqua. Ut enim
+ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut.
+
+|Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do
+eiusmod tempor.  Incididunt ut labore et dolore magna aliqua. Ut enim
+ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut.
+
+Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do
+eiusmod tempor.  Incididunt ut labore et dolore magna aliqua. Ut enim
+ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut.
+=-=
+Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do
+eiusmod tempor.  Incididunt ut labore et dolore magna aliqua. Ut enim
+ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut.
+
+Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do
+eiusmod tempor.
+Incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam,
+quis nostrud exercitation ullamco laboris nisi ut.
+
+Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do
+eiusmod tempor.  Incididunt ut labore et dolore magna aliqua. Ut enim
+ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut.
+=-=-=
+
+Name: end of buffer
+
+=-=
+Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do
+eiusmod tempor.  Incididunt ut labore et dolore magna aliqua. Ut enim
+ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut.
+
+Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do
+eiusmod tempor.  Incididunt ut labore et dolore magna aliqua. Ut enim
+ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut.
+
+Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do
+eiusmod tempor.  Incididunt ut labore et dolore magna aliqua. Ut enim
+ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut.|
+=-=
+Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do
+eiusmod tempor.  Incididunt ut labore et dolore magna aliqua. Ut enim
+ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut.
+
+Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do
+eiusmod tempor.  Incididunt ut labore et dolore magna aliqua. Ut enim
+ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut.
+
+Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do
+eiusmod tempor.
+Incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam,
+quis nostrud exercitation ullamco laboris nisi ut.
+=-=-=
diff --git a/test/lisp/textmodes/fill-tests.el b/test/lisp/textmodes/fill-tests.el
index 6e079973100e..afd17c52dcd5 100644
--- a/test/lisp/textmodes/fill-tests.el
+++ b/test/lisp/textmodes/fill-tests.el
@@ -28,6 +28,7 @@
 ;;; Code:
 
 (require 'ert)
+(require 'ert-x)
 
 (ert-deftest fill-test-no-fill-polish-nobreak-p nil
   "Tests of the `fill-polish-nobreak-p' function."
@@ -121,6 +122,95 @@ test-fill-haskell
   ;; w
 ")))
 
+(ert-deftest fill-test-fill-paragraph-semlf ()
+  "Test the `fill-paragraph-semlf' function."
+  (ert-test-erts-file (ert-resource-file "semlf.erts")
+                      (lambda ()
+			(fill-paragraph-semlf))))
+
+(ert-deftest fill-test-fill-paragraph-semlf-fill-paragraph-function ()
+  "Test `fill-paragraph-semlf' as `fill-paragraph-function'."
+  (ert-test-erts-file (ert-resource-file "semlf-fill-paragraph-function.erts")
+                      (lambda ()
+			(setq-local fill-paragraph-function #'fill-paragraph-semlf)
+			(fill-paragraph))))
+
+(ert-deftest fill-test-fill-paragraph-semlf-justify ()
+  "Test the JUSTIFY parameter of the `fill-paragraph-semlf' function."
+  (ert-test-erts-file (ert-resource-file "semlf-justify.erts")
+                      (lambda ()
+			(fill-paragraph-semlf 'justify))))
+
+(ert-deftest fill-test-fill-paragraph-semlf-sentence-end-double-space ()
+  "Test the `fill-paragraph-semlf' function with `sentence-end-double-space'."
+  (ert-test-erts-file (ert-resource-file "semlf-sentence-end-double-space.erts")
+                      (lambda ()
+			(setq-local sentence-end-double-space nil)
+			(fill-paragraph-semlf))))
+
+(ert-deftest fill-test-fill-paragraph-semlf-fill-column ()
+  "Test the `fill-paragraph-semlf' function with `fill-column'."
+  (ert-test-erts-file (ert-resource-file "semlf-fill-column.erts")
+                      (lambda ()
+			(setq-local fill-column 35)
+			(fill-paragraph-semlf))))
+
+(ert-deftest fill-test-fill-paragraph-semlf-punctuation-marks ()
+  "Test the `fill-paragraph-semlf' function with different punctuation marks."
+  (ert-test-erts-file (ert-resource-file "semlf-punctuation-marks.erts")
+                      (lambda ()
+			(fill-paragraph-semlf))))
+
+(ert-deftest fill-test-fill-paragraph-semlf-twice ()
+  "Test to run the `fill-paragraph-semlf' function twice."
+  (ert-test-erts-file (ert-resource-file "semlf-twice.erts")
+                      (lambda ()
+			(goto-char (point-min))
+			(fill-paragraph-semlf)
+			(goto-char (point-min))
+			(fill-paragraph-semlf))))
+
+(ert-deftest fill-test-fill-paragraph-semlf-fill-prefix ()
+  "Test the `fill-paragraph-semlf' function with different fill prefixes."
+  (ert-test-erts-file (ert-resource-file "semlf-fill-prefix.erts")
+                      (lambda ()
+			(fill-paragraph-semlf))))
+
+(ert-deftest fill-test-fill-paragraph-semlf-indented-block ()
+  "Test the `fill-paragraph-semlf' function with an indented block."
+  (ert-test-erts-file (ert-resource-file "semlf-indented-block.erts")
+                      (lambda ()
+			(fill-paragraph-semlf))))
+
+(ert-deftest fill-test-fill-paragraph-semlf-emacs-lisp-mode ()
+  "Test the `fill-paragraph-semlf' function with `emacs-lisp-mode'."
+  (ert-test-erts-file (ert-resource-file "semlf-emacs-lisp-mode.erts")
+                      (lambda ()
+			(emacs-lisp-mode)
+			(fill-paragraph-semlf))))
+
+(ert-deftest fill-test-fill-paragraph-semlf-c-mode ()
+  "Test the `fill-paragraph-semlf' function with `c-mode'."
+  (ert-test-erts-file (ert-resource-file "semlf-c-mode.erts")
+                      (lambda ()
+			(c-mode)
+			(fill-paragraph-semlf))))
+
+(ert-deftest fill-test-fill-paragraph-semlf-org-mode ()
+  "Test the `fill-paragraph-semlf' function with `org-mode'."
+  (ert-test-erts-file (ert-resource-file "semlf-org-mode.erts")
+                      (lambda ()
+			(org-mode)
+			(fill-paragraph-semlf))))
+
+(ert-deftest fill-test-fill-paragraph-semlf-markdown-mode ()
+  "Test the `fill-paragraph-semlf' function with `markdown-mode'."
+  (skip-unless (functionp 'markdown-mode))
+  (ert-test-erts-file (ert-resource-file "semlf-markdown-mode.erts")
+                      (lambda ()
+			(markdown-mode)
+			(fill-paragraph-semlf))))
+
 (provide 'fill-tests)
 
 ;;; fill-tests.el ends here
-- 
2.49.0


--=-=-=--

Acknowledgement sent to Roi Martin <jroi.martin@HIDDEN>:
New bug report received and forwarded. Copy sent to mbork@HIDDEN, bug-gnu-emacs@HIDDEN. Full text available.

Report forwarded to mbork@HIDDEN, bug-gnu-emacs@HIDDEN:
bug#78561; Package emacs. Full text available.

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Last modified: Thu, 19 Jun 2025 06:45:03 UTC

GNU bug tracking system
Copyright (C) 1999 Darren O. Benham, 1997 nCipher Corporation Ltd, 1994-97 Ian Jackson.

GNU bug report logs - #78561 [PATCH] Add semantic linefeed support for paragraph filling

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GNU bug report logs - #78561
[PATCH] Add semantic linefeed support for paragraph filling