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Subject: bug#6000: describe-text-sexp does not know window-width
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In describe-text-sexp there is a call to window-width. I believe this
gives unreliable results because the help-window might not be select
at that point always.
This shows up in the display of (what-cursor-position t) where the
sexp are sometimes unnecessary hidden behind "[Show]".
A possible good enough cure is to surround the call to window-width
with something like this
(with-selected-window (or (get-buffer-window "*Help*") (selected-window))
(window-width))
Content-Disposition: inline Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-Mailer: MIME-tools 5.427 (Entity 5.427) Content-Type: text/plain; charset=utf-8 X-Loop: help-debbugs@HIDDEN From: help-debbugs@HIDDEN (GNU bug Tracking System) To: Lennart Borgman <lennart.borgman@HIDDEN> Subject: bug#6000: Acknowledgement (describe-text-sexp does not know window-width) Message-ID: <handler.6000.B.127193856125454.ack <at> debbugs.gnu.org> References: <h2ye01d8a51004220515xa9578490nc6c05fba97e670c0@HIDDEN> X-Gnu-PR-Message: ack 6000 X-Gnu-PR-Package: emacs Reply-To: 6000 <at> debbugs.gnu.org Date: Thu, 22 Apr 2010 12:16:02 +0000 Thank you for filing a new bug report with GNU. This is an automatically generated reply to let you know your message has been received. Your message is being forwarded to the package maintainers and other interested parties for their attention; they will reply in due course. Your message has been sent to the package maintainer(s): bug-gnu-emacs@HIDDEN If you wish to submit further information on this problem, please send it to 6000 <at> debbugs.gnu.org. Please do not send mail to help-debbugs@HIDDEN unless you wish to report a problem with the Bug-tracking system. --=20 6000: http://debbugs.gnu.org/cgi/bugreport.cgi?bug=3D6000 GNU Bug Tracking System Contact help-debbugs@HIDDEN with problems
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Subject: bug#6000: describe-text-sexp does not know window-width
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(Lennart Borgman's message of "Thu, 22 Apr 2010 14:15:26 +0200")
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Content preview: > In describe-text-sexp there is a call to window-width. I
believe this > gives unreliable results because the help-window might not
be select > at that point always. > > This shows up in the display of
(what-cursor-position
t) where the > sexp are sometimes unnecessary hidden behind "[Show]". > >
A possible good enough cure is to surround the call to window-width > with
something like this > > (with-selected-window (or (get-buffer-window "*Help*")
(selected-window)) > (window-width)) [...]
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Content preview: > In describe-text-sexp there is a call to window-width. I
believe this > gives unreliable results because the help-window might not
be select > at that point always. > > This shows up in the display of (what-cursor-position
t) where the > sexp are sometimes unnecessary hidden behind "[Show]". > >
A possible good enough cure is to surround the call to window-width > with
something like this > > (with-selected-window (or (get-buffer-window "*Help*")
(selected-window)) > (window-width)) [...]
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> In describe-text-sexp there is a call to window-width. I believe this
> gives unreliable results because the help-window might not be select
> at that point always.
>
> This shows up in the display of (what-cursor-position t) where the
> sexp are sometimes unnecessary hidden behind "[Show]".
>
> A possible good enough cure is to surround the call to window-width
> with something like this
>
> (with-selected-window (or (get-buffer-window "*Help*") (selected-window))
> (window-width))
Martin referred to this bug report from bug#17831, and I noticed
that instead of hard-coding the "*Help*" buffer name, better would be
to use (current-buffer) because the formatted buffer is current:
(- (if (window-live-p (get-buffer-window (current-buffer) t))
(with-selected-window (get-buffer-window (current-buffer) t)
(window-width))
(window-width))
(current-column))
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Subject: bug#6000: describe-text-sexp does not know window-width
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Content preview: Juri Linkov <juri@HIDDEN> writes: >> (with-selected-window
(or (get-buffer-window "*Help*") (selected-window)) >> (window-width)) >
> Martin referred to this bug report from bug#17831, and I noticed > that
instead of hard-coding the " [...]
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Juri Linkov <juri@HIDDEN> writes:
>> (with-selected-window (or (get-buffer-window "*Help*") (selected-window))
>> (window-width))
>
> Martin referred to this bug report from bug#17831, and I noticed
> that instead of hard-coding the "*Help*" buffer name, better would be
> to use (current-buffer) because the formatted buffer is current:
>
> (- (if (window-live-p (get-buffer-window (current-buffer) t))
> (with-selected-window (get-buffer-window (current-buffer) t)
> (window-width))
> (window-width))
> (current-column))
This sounds like a good idea to me, but there wasn't a recipe to
reproduce whatever error this bug report was talking about, so I can't
test.
Does anybody have a test case that displays the problem (in case it's
still in place after all these years)?
--
(domestic pets only, the antidote for overdose, milk.)
bloggy blog: http://lars.ingebrigtsen.no
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Subject: bug#6000: describe-text-sexp does not know window-width
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03 Jun 2021 11:07:39 +0200")
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> This sounds like a good idea to me, but there wasn't a recipe to
> reproduce whatever error this bug report was talking about, so I can't
> test.
>
> Does anybody have a test case that displays the problem (in case it's
> still in place after all these years)?
Indeed a test case would be needed, but I have none.
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>> This sounds like a good idea to me, but there wasn't a recipe to
>> reproduce whatever error this bug report was talking about, so I can't
>> test.
>>
>> Does anybody have a test case that displays the problem (in case it's
>> still in place after all these years)?
>
> Indeed a test case would be needed, but I have none.
There's no realistic test case for this. You can do
(defun foo ()
(interactive)
(with-current-buffer (get-buffer-create "*foo*")
(describe-text-sexp 'foooooooooooooooooooooooooooooooooo)))
and M-x foo in some window. Dependent on the width of that window,
`describe-text-sexp' will decide whether to insert the expression in
*foo* or display a "Show" button instead. When you eventually display
*foo* you will see the result. I think a simple check like
(if (and (not (string-match-p "\n" pp))
(eq (window-buffer) (current-buffer))
(<= (length pp) (- (window-width) (current-column))))
(insert pp)
should work.
martin
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Content preview: martin rudalics <rudalics@HIDDEN> writes: > and M-x foo in
some window. Dependent on the width of that window, > `describe-text-sexp'
will decide whether to insert the expression in > *foo* or display a "Show"
button instead. When you eventua [...]
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martin rudalics <rudalics@HIDDEN> writes:
> and M-x foo in some window. Dependent on the width of that window,
> `describe-text-sexp' will decide whether to insert the expression in
> *foo* or display a "Show" button instead. When you eventually display
> *foo* you will see the result. I think a simple check like
>
> (if (and (not (string-match-p "\n" pp))
> (eq (window-buffer) (current-buffer))
> (<= (length pp) (- (window-width) (current-column))))
> (insert pp)
>
> should work.
Hm... this will always insert the [Show] button if the *foo* buffer
isn't the current buffer? Is that what we want here?
--
(domestic pets only, the antidote for overdose, milk.)
bloggy blog: http://lars.ingebrigtsen.no
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>> and M-x foo in some window. Dependent on the width of that window,
>> `describe-text-sexp' will decide whether to insert the expression in
>> *foo* or display a "Show" button instead. When you eventually display
>> *foo* you will see the result. I think a simple check like
>>
>> (if (and (not (string-match-p "\n" pp))
>> (eq (window-buffer) (current-buffer))
>> (<= (length pp) (- (window-width) (current-column))))
>> (insert pp)
>>
>> should work.
>
> Hm... this will always insert the [Show] button if the *foo* buffer
> isn't the current buffer? Is that what we want here?
`describe-text-sexp' always works on the current buffer
(defun describe-text-sexp (sexp)
"Insert a short description of SEXP in the current buffer."
so the added line will avoid the [Show] button iff the selected window
doesn't show the current buffer which should be rare enough.
martin
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Subject: bug#6000: describe-text-sexp does not know window-width
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Content preview: >> Does anybody have a test case that displays the problem
(in case it's >> still in place after all these years)? > > Indeed a test
case would be needed,
but I have none. With emacs -Q evaluate (progn (split-window
nil -20 t) (put-text-property 1 2 'foo "This is a very long text property")
(describe-char 1))
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>> Does anybody have a test case that displays the problem (in case it's
>> still in place after all these years)?
>
> Indeed a test case would be needed, but I have none.
With emacs -Q evaluate
(progn
(split-window nil -20 t)
(put-text-property 1 2 'foo "This is a very long text property")
(describe-char 1))
or
(progn
(setq split-height-threshold nil)
(setq split-width-threshold 20)
(put-text-property 1 2 'foo "This is a very long text property")
(describe-char 1))
Here these show a *Help* window on the right where not the entire text
property string is visible. Depending on your settings it won't matter
much because the rest of that buffer is only partially visible too.
To show the inverse effect, again with emacs -Q, evaluate
(progn
(split-window nil 20 t)
(put-text-property 1 2 'foo t)
(describe-char 1))
Here this shows *Help* in the window on the right with a line
foo [Show]
where clicking on [Show] will show "t" in the window on the left.
This is embarrassingly silly.
Obviously, there are many more scenarios but most of them require to
customize `display-buffer-alist'. Presumably, most people don't notice
the behavior - they just got used to it.
We could
- Do nothing: If, in the earlier scenarios, we'd insert a "Show" button
instead of the text, clicking that button might again pop up a too
narrow *Pp Eval Output* window and nothing has been gained. As for
the last scenario, we could tell users that they are on their own when
they invoke `describe-char' in a too narrow window.
- Skip the `window-width' check in `describe-text-sexp' and maybe
recommend using `temp-buffer-resize-mode' with a few tweaks like
(progn
(temp-buffer-resize-mode)
(setq temp-buffer-max-width 100)
(setq fit-window-to-buffer-horizontally t)
(setq split-height-threshold nil)
(setq split-width-threshold 20)
(put-text-property 1 2 'foo "This is a very long text property")
(describe-char 1))
But some people don't like `temp-buffer-resize-mode'.
- Calculate the maximum width of text in the buffer preceding the line
where to insert the property with a function like
(defun max-column-in-frame ()
"Return maximum column of current buffer in selected frame.
The return value is the longest column from the beginning of the
buffer to the line specified by the selected frame's height."
(save-excursion
(goto-char (point-min))
(let ((width (frame-width))
(height (frame-height))
(line 0)
(max-column 0)
column)
(while (and (< line height) (< (point) (point-max)))
(setq column (move-to-column width))
(when (> column max-column)
(setq max-column column))
(forward-line 1)
(setq line (1+ line)))
max-column)))
and use that instead of `window-width' in `describe-text-sexp' as
(<= (length pp) (- (max-column-in-frame) (current-column))))
This will delegate the problem to those who inserted text earlier into
that buffer. If they were right, `describe-text-sexp' won't do anything
wrong.
martin
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X-Now-Playing: Andy Strain's _Breathing Instruments_: "Patience"
Date: Sun, 06 Jun 2021 11:03:47 +0200
In-Reply-To: <b7cf674b-63b7-9711-0af5-66d98eb29c5d@HIDDEN> (martin rudalics's
message of "Fri, 4 Jun 2021 14:44:38 +0200")
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Content preview: martin rudalics <rudalics@HIDDEN> writes: >
`describe-text-sexp'
always works on the current buffer > > (defun describe-text-sexp (sexp) >
"Insert a short description of SEXP in the current buffer." > > so the added
line will avoid the [Show] [...]
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martin rudalics <rudalics@HIDDEN> writes:
> `describe-text-sexp' always works on the current buffer
>
> (defun describe-text-sexp (sexp)
> "Insert a short description of SEXP in the current buffer."
>
> so the added line will avoid the [Show] button iff the selected window
> doesn't show the current buffer which should be rare enough.
That's what I thought should happen, but your proposed change is the
patch below, which seems to do the opposite? I.e., it'll always do the
[Show] button if the selected window doesn't show the current buffer...
diff --git a/lisp/descr-text.el b/lisp/descr-text.el
index 85017de5d5..f92f37d53d 100644
--- a/lisp/descr-text.el
+++ b/lisp/descr-text.el
@@ -51,7 +51,8 @@ describe-text-sexp
(setq pp (substring pp 0 (1- (length pp)))))
(if (and (not (string-match-p "\n" pp))
- (<= (length pp) (- (window-width) (current-column))))
+ (eq (window-buffer) (current-buffer))
+ (<= (length pp) (- (window-width) (current-column))))
(insert pp)
(insert-text-button
"[Show]"
--
(domestic pets only, the antidote for overdose, milk.)
bloggy blog: http://lars.ingebrigtsen.no
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