GNU logs - #48724, boring messages

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Subject: bug#48724: Code collapsing and outline headings for elisp
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Currently, outline-minor-mode has the capability to treat "defun" construc=
ts
as heading, allowing one to choose to hide some code from view by collapsi=
ng
the region of code.  It would be beneficial for the actual major mode itse=
lf
(i.e. emacs-lisp-mode) to handle the code collapsing, leaving the code hig=
hlighting
intact.  Code collapsing could also be extended beyond not only collapsing
functions and variables ((defun, defvar), but also to additional construct=
s that could
be indented (e.g. lists '(...), let, let*, pcase) and other constructs use=
rs could
find useful (e.g. if, when, ).

And for outline-minor-mode, the mode could then be used to further enhance=
 the structuring
of larger chunks of code (e.g. a collection of functions) using outline he=
adings.  Outlining
would then be a separate capability different from code collapsing.

Regards
Christopher

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From: help-debbugs@HIDDEN (GNU bug Tracking System)
To: Christopher Dimech <dimech@HIDDEN>
Subject: bug#48724: Acknowledgement (Code collapsing and outline headings
 for elisp)
Message-ID: <handler.48724.B.162223556913995.ack <at> debbugs.gnu.org>
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Date: Fri, 28 May 2021 21:00:02 +0000

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Subject: bug#48724: Code collapsing and outline headings for elisp
Resent-From: Juri Linkov <juri@HIDDEN>
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 (Christopher Dimech's message of "Fri, 28 May 2021 22:59:17 +0200")
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> Currently, outline-minor-mode has the capability to treat "defun" constructs
> as heading, allowing one to choose to hide some code from view by collapsing
> the region of code.  It would be beneficial for the actual major mode itself
> (i.e. emacs-lisp-mode) to handle the code collapsing, leaving the code highlighting
> intact.  Code collapsing could also be extended beyond not only collapsing
> functions and variables ((defun, defvar), but also to additional constructs that could
> be indented (e.g. lists '(...), let, let*, pcase) and other constructs users could
> find useful (e.g. if, when, ).
>
> And for outline-minor-mode, the mode could then be used to further enhance the structuring
> of larger chunks of code (e.g. a collection of functions) using outline headings.  Outlining
> would then be a separate capability different from code collapsing.

Currently everything is customizable in outline-minor-mode by just
two variables: outline-regexp and outline-level.  So when necessary,
emacs-lisp-mode could provide an option that will set different values
of these variables, one of which could set outline-regexp to a regexp
that matches: lists, '(...), let, let*, pcase, if, when, etc…

Message sent to bug-gnu-emacs@HIDDEN:

Subject: bug#48724: Code collapsing and outline headings for elisp
Resent-From: Christopher Dimech <dimech@HIDDEN>
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From: Christopher Dimech <dimech@HIDDEN>
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> Sent: Sunday, May 30, 2021 at 9:57 AM
> From: "Juri Linkov" <juri@linkov=2Enet>
> To: "Christopher Dimech" <dimech@gmx=2Ecom>
> Cc: 48724@debbugs=2Egnu=2Eorg
> Subject: Re: bug#48724: Code collapsing and outline headings for elisp
>
> > Currently, outline-minor-mode has the capability to treat "defun" cons=
tructs
> > as heading, allowing one to choose to hide some code from view by coll=
apsing
> > the region of code=2E  It would be beneficial for the actual major mod=
e itself
> > (i=2Ee=2E emacs-lisp-mode) to handle the code collapsing, leaving the =
code highlighting
> > intact=2E  Code collapsing could also be extended beyond not only coll=
apsing
> > functions and variables ((defun, defvar), but also to additional const=
ructs that could
> > be indented (e=2Eg=2E lists '(=2E=2E=2E), let, let*, pcase) and other =
constructs users could
> > find useful (e=2Eg=2E if, when, )=2E
> >
> > And for outline-minor-mode, the mode could then be used to further enh=
ance the structuring
> > of larger chunks of code (e=2Eg=2E a collection of functions) using ou=
tline headings=2E  Outlining
> > would then be a separate capability different from code collapsing=2E
>=20
> Currently everything is customizable in outline-minor-mode by just
> two variables: outline-regexp and outline-level=2E  So when necessary,
> emacs-lisp-mode could provide an option that will set different values
> of these variables, one of which could set outline-regexp to a regexp
> that matches: lists, '(=2E=2E=2E), let, let*, pcase, if, when, etc=E2=80=
=A6

The general impression is that outline-minor-mode is a general mode
for customisable headings that are then handled by the respective
major mode=2E

General settings could be better, because some variables are not customiza=
ble=2E

Serious problem is that the two important variables: `outline-regexp' and
`outline-heading-alist' are not customizable by using "M-x customize-group=
"=2E

Additionally both of them should be customizable per mode=2E  Don't you th=
ink so?

There has been a discussion today about outline-minor-mode settings for fo=
rtran
(both fixed and free form)=2E  Have had a go at using "!" and "!!", but "H=
ide Body"
did not hide the body=2E

There could be some default headings for fortran when outline-minor-mode i=
s enabled=2E
One could follow the current setup for emacs-lisp-mode, for fortran=2E

!! for heading level 1
!!! for subheading level 2
!!!! for subsubheading level 3

Together with "Hide Body" for lines beginning with "subroutine" and "funct=
ion"=2E

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> Sent: Sunday, May 30, 2021 at 11:55 AM
> From: "Christopher Dimech" <dimech@gmx=2Ecom>
> To: "Juri Linkov" <juri@linkov=2Enet>
> Cc: 48724@debbugs=2Egnu=2Eorg
> Subject: bug#48724: Code collapsing and outline headings for elisp
>
> > Sent: Sunday, May 30, 2021 at 9:57 AM
> > From: "Juri Linkov" <juri@linkov=2Enet>
> > To: "Christopher Dimech" <dimech@gmx=2Ecom>
> > Cc: 48724@debbugs=2Egnu=2Eorg
> > Subject: Re: bug#48724: Code collapsing and outline headings for elisp
> >
> > > Currently, outline-minor-mode has the capability to treat "defun" co=
nstructs
> > > as heading, allowing one to choose to hide some code from view by co=
llapsing
> > > the region of code=2E  It would be beneficial for the actual major m=
ode itself
> > > (i=2Ee=2E emacs-lisp-mode) to handle the code collapsing, leaving th=
e code highlighting
> > > intact=2E  Code collapsing could also be extended beyond not only co=
llapsing
> > > functions and variables ((defun, defvar), but also to additional con=
structs that could
> > > be indented (e=2Eg=2E lists '(=2E=2E=2E), let, let*, pcase) and othe=
r constructs users could
> > > find useful (e=2Eg=2E if, when, )=2E
> > >
> > > And for outline-minor-mode, the mode could then be used to further e=
nhance the structuring
> > > of larger chunks of code (e=2Eg=2E a collection of functions) using =
outline headings=2E  Outlining
> > > would then be a separate capability different from code collapsing=
=2E
> >=20
> > Currently everything is customizable in outline-minor-mode by just
> > two variables: outline-regexp and outline-level=2E  So when necessary,
> > emacs-lisp-mode could provide an option that will set different values
> > of these variables, one of which could set outline-regexp to a regexp
> > that matches: lists, '(=2E=2E=2E), let, let*, pcase, if, when, etc=E2=
=80=A6
>=20
> The general impression is that outline-minor-mode is a general mode
> for customisable headings that are then handled by the respective
> major mode=2E
>=20
> General settings could be better, because some variables are not customi=
zable=2E
>=20
> Serious problem is that the two important variables: `outline-regexp' an=
d
> `outline-heading-alist' are not customizable by using "M-x customize-gro=
up"=2E
>=20
> Additionally both of them should be customizable per mode=2E  Don't you =
think so?
>=20
> There has been a discussion today about outline-minor-mode settings for =
fortran
> (both fixed and free form)=2E  Have had a go at using "!" and "!!", but =
"Hide Body"
> did not hide the body=2E
>=20
> There could be some default headings for fortran when outline-minor-mode=
 is enabled=2E
> One could follow the current setup for emacs-lisp-mode, for fortran=2E
>=20
> !! for heading level 1
> !!! for subheading level 2
> !!!! for subsubheading level 3
>=20
> Together with "Hide Body" for lines beginning with "subroutine" and "fun=
ction"=2E
=20
Looking at emacs-lisp again, the levels should be as follows

!!! for heading level 1 (starting as !!! as in emacs-lisp-mode)
!!!! for subheading level 2
!!!!! for subsubheading level 3  etc

I wonder if there exists the capabibily in outline-minor-mode to hide
code structures inside another code structure=2E

For instance for "do", "if" and "else" statements=2E

do in1 =3D 1, nr(1)
  do in2 =3D 1, nr(1)
    ind =3D in1 - in2
    if (ind < 0) then
      res(in1, in2) =3D conjg(fc(abs(ind)+1))
    else
      res(in1, in2) =3D fc(ind+1)
    endif
  enddo
enddo

hiding would then give the following

do in1 =3D 1, nr(1)
  do in2 =3D 1, nr(1)
    ind =3D in1 - in2
    if (ind < 0) then =2E=2E=2E
    else =2E=2E=2E
    end if
  end do
end do

do in1 =3D 1, nr(1)
  do in2 =3D 1, nr(1) =2E=2E=2E
  end do
end do

do in1 =3D 1, nr(1) =2E=2E=2E
end do

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Subject: bug#48724: Code collapsing and outline headings for elisp
In-Reply-To: <trinity-0f96debc-de1b-417f-affe-7cdf6966329e-1622235557342@3c-app-mailcom-bs01>
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> Serious problem is that the two important variables: `outline-regexp' and
> `outline-heading-alist' are not customizable by using "M-x customize-group".
>
> Additionally both of them should be customizable per mode.  Don't you think so?

I think that modes should set `outline-regexp' and `outline-heading-alist'
according to the constructs of their programming language.  Then users
don't need to customize these variables.

> There has been a discussion today about outline-minor-mode settings for fortran
> (both fixed and free form).  Have had a go at using "!" and "!!", but "Hide Body"
> did not hide the body.
>
> There could be some default headings for fortran when outline-minor-mode is enabled.
> One could follow the current setup for emacs-lisp-mode, for fortran.
>
> !! for heading level 1
> !!! for subheading level 2
> !!!! for subsubheading level 3

I agree it would be nice to set an appropriate value of `outline-regexp'
and `outline-heading-alist' for fortran-mode in lisp/progmodes/fortran.el.

But the last time I used Fortran was when Fortran had the "C" character
for comments at the first fixed column on a punched card, and now
your example uses some new syntax "!" for comments, so sorry, can't help here.

This task would be a nice assignment for the group of students.

Message sent to bug-gnu-emacs@HIDDEN:

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> Sent: Monday, May 31, 2021 at 10:15 AM
> From: "Juri Linkov" <juri@HIDDEN>
> To: "Christopher Dimech" <dimech@HIDDEN>
> Cc: 48724 <at> debbugs.gnu.org
> Subject: Re: bug#48724: Code collapsing and outline headings for elisp
>
> > Serious problem is that the two important variables: `outline-regexp' =
and
> > `outline-heading-alist' are not customizable by using "M-x customize-g=
roup".
> >
> > Additionally both of them should be customizable per mode.  Don't you =
think so?
>
> I think that modes should set `outline-regexp' and `outline-heading-alis=
t'
> according to the constructs of their programming language.  Then users
> don't need to customize these variables.

Quite Right.

> > There has been a discussion today about outline-minor-mode settings fo=
r fortran
> > (both fixed and free form).  Have had a go at using "!" and "!!", but =
"Hide Body"
> > did not hide the body.
> >
> > There could be some default headings for fortran when outline-minor-mo=
de is enabled.
> > One could follow the current setup for emacs-lisp-mode, for fortran.
> >
> > !! for heading level 1
> > !!! for subheading level 2
> > !!!! for subsubheading level 3
>
> I agree it would be nice to set an appropriate value of `outline-regexp'
> and `outline-heading-alist' for fortran-mode in lisp/progmodes/fortran.e=
l.
>
> But the last time I used Fortran was when Fortran had the "C" character
> for comments at the first fixed column on a punched card, and now
> your example uses some new syntax "!" for comments, so sorry, can't help=
 here.
>
> This task would be a nice assignment for the group of students.

There are currently two modes (1) the fixed format fortran (fortran-made) =
you
describe with "C" character for comments, and (2) the newer free format fo=
rtran
with "!" character for comments (f90-mode).

Could use for fortran-mode starting from three CCC as in elisp

CCC Heading
CCCC Subheading
CCCCC SubSubHeading etc

And for f90-mode use the following, starting from three !!! as in elisp

!!! for heading level 1
!!!! for subheading level 2
!!!!! for subsubheading level 3

Message sent to bug-gnu-emacs@HIDDEN:

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> Sent: Monday, May 31, 2021 at 10:15 AM
> From: "Juri Linkov" <juri@HIDDEN>
> To: "Christopher Dimech" <dimech@HIDDEN>
> Cc: 48724 <at> debbugs.gnu.org
> Subject: Re: bug#48724: Code collapsing and outline headings for elisp
>
> > Serious problem is that the two important variables: `outline-regexp' =
and
> > `outline-heading-alist' are not customizable by using "M-x customize-g=
roup".
> >
> > Additionally both of them should be customizable per mode.  Don't you =
think so?
>
> I think that modes should set `outline-regexp' and `outline-heading-alis=
t'
> according to the constructs of their programming language.  Then users
> don't need to customize these variables.
>
> > There has been a discussion today about outline-minor-mode settings fo=
r fortran
> > (both fixed and free form).  Have had a go at using "!" and "!!", but =
"Hide Body"
> > did not hide the body.
> >
> > There could be some default headings for fortran when outline-minor-mo=
de is enabled.
> > One could follow the current setup for emacs-lisp-mode, for fortran.
> >
> > !! for heading level 1
> > !!! for subheading level 2
> > !!!! for subsubheading level 3
>
> I agree it would be nice to set an appropriate value of `outline-regexp'
> and `outline-heading-alist' for fortran-mode in lisp/progmodes/fortran.e=
l.

I suggest that emacs-lisp-mode does code collapse (show/hide) by default.
Then outline-minor-mode does additional headings in the form

;;; Heading 1
;;;; SubHeading
;;;;; SubSubHeading

;;; Heading 2

outline-minor-mode would then be made to collapse sections of code between
headlines.

This means that a headline hide could hide a number of variable and functi=
on
definitions that belong together.

> But the last time I used Fortran was when Fortran had the "C" character
> for comments at the first fixed column on a punched card, and now
> your example uses some new syntax "!" for comments, so sorry, can't help=
 here.
>
> This task would be a nice assignment for the group of students.

Which major modes could be done straight away?

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> I suggest that emacs-lisp-mode does code collapse (show/hide) by default.
> Then outline-minor-mode does additional headings in the form
>
> ;;; Heading 1
> ;;;; SubHeading
> ;;;;; SubSubHeading
>
> ;;; Heading 2
>
> outline-minor-mode would then be made to collapse sections of code between
> headlines.
>
> This means that a headline hide could hide a number of variable and function
> definitions that belong together.

Recently we changed the outlines of emacs-lisp-mode in https://debbugs.gnu.org/46878
So this is already fixed.

Last modified: Tue, 1 Jun 2021 21:00:02 UTC

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