Arbitrary folding in emacs

Arbitrary folding in emacs

[C K Kashyap]

I am trying to go-over a huge c++ file. In vim, I can collapse a huge set
of lines by simply highlighting it an then doing a zf. I was wondering if I
can do something similar in emacs - rather how I can do it in emacs.

I tried hs-minor-mode but it appears to have pre-defined notions of
"foldable" blocks.

Regards,
Kashyap

Re: Arbitrary folding in emacs

[Eli Zaretskii]

> From: C K Kashyap <ckkashyap@gmail.com>
> Date: Fri, 28 Mar 2014 14:36:47 +0530
> 
> I am trying to go-over a huge c++ file. In vim, I can collapse a huge set
> of lines by simply highlighting it an then doing a zf. I was wondering if I
> can do something similar in emacs - rather how I can do it in emacs.

Try "C-x $", giving it an argument that says how deep should a line be
indented before it is replaced by an ellipsis.

Re: Arbitrary folding in emacs

[C K Kashyap]

Thanks Eli ... however, this does not quite work for me. Among other things
- I need to collapse a huge bunch of initializations starting at column 1.
What would be great is if I could just select a bunch of lines and apply
folding on it!

Regards,
Kashyap


On Fri, Mar 28, 2014 at 2:42 PM, Eli Zaretskii <eliz@gnu.org> wrote:

> > From: C K Kashyap <ckkashyap@gmail.com>
> > Date: Fri, 28 Mar 2014 14:36:47 +0530
> >
> > I am trying to go-over a huge c++ file. In vim, I can collapse a huge set
> > of lines by simply highlighting it an then doing a zf. I was wondering
> if I
> > can do something similar in emacs - rather how I can do it in emacs.
>
> Try "C-x $", giving it an argument that says how deep should a line be
> indented before it is replaced by an ellipsis.
>
>

Re: Arbitrary folding in emacs

[Eli Zaretskii]

> From: C K Kashyap <ckkashyap@gmail.com>
> Date: Fri, 28 Mar 2014 14:55:44 +0530
> Cc: "help-gnu-emacs@gnu.org" <help-gnu-emacs@gnu.org>
> 
> Thanks Eli ... however, this does not quite work for me. Among other things
> - I need to collapse a huge bunch of initializations starting at column 1.
> What would be great is if I could just select a bunch of lines and apply
> folding on it!

In that case, you can narrow the buffer so as to exclude that
portion.  Mark the region you want to hide, and then type "C-x n n".

Re: Arbitrary folding in emacs

[C K Kashyap]

narrowing the region is kind of opposite of what I am looking for - but
I'll give it a shot - I am not familiar with it.

Regards,
Kashyap


On Fri, Mar 28, 2014 at 3:07 PM, Eli Zaretskii <eliz@gnu.org> wrote:

> > From: C K Kashyap <ckkashyap@gmail.com>
> > Date: Fri, 28 Mar 2014 14:55:44 +0530
> > Cc: "help-gnu-emacs@gnu.org" <help-gnu-emacs@gnu.org>
> >
> > Thanks Eli ... however, this does not quite work for me. Among other
> things
> > - I need to collapse a huge bunch of initializations starting at column
> 1.
> > What would be great is if I could just select a bunch of lines and apply
> > folding on it!
>
> In that case, you can narrow the buffer so as to exclude that
> portion.  Mark the region you want to hide, and then type "C-x n n".
>
>

Re: Arbitrary folding in emacs

[Tim Visher]

Hi Kashyap,

On Fri, Mar 28, 2014 at 5:50 AM, C K Kashyap <ckkashyap@gmail.com> wrote:
> narrowing the region is kind of opposite of what I am looking for - but
> I'll give it a shot - I am not familiar with it.

To be clear, what I believe Eli is saying is to mark the entirety of
the buffer that you're interested in seeing, and then Calling
narrow-to-region. If you highlight the stuff you don't want to see and
call narrow-to-region, it will indeed have quite the opposite effect
of what you're looking for.

I too would be interested in being able to hide away a region as vim
is capable of, but I've never heard of a feature like that in Emacs.
It might be a very useful extension to hs-minor-mode.

--

In Christ,

Timmy V.

http://blog.twonegatives.com/
http://five.sentenc.es/ -- Spend less time on mail

Re: Arbitrary folding in emacs

[Nicolas Richard]

Tim Visher <tim.visher@gmail.com> writes:
> I too would be interested in being able to hide away a region as vim
> is capable of, but I've never heard of a feature like that in Emacs.
> It might be a very useful extension to hs-minor-mode.

outline.el has outline-flag-region, but
(i) it doens't use an ellipsis and
(ii) it is not interactive.

you can test it by selecting some part of the buffer then
M-: (progn (outline-flag-region (region-beginning) (region-end) t) (sit-for 4) (outline-flag-region (region-beginning) (region-end) nil))

(sit-for is just there to see the effect before cancelling it with the
'nil' 3rd argument)

I think it doesn't exist because it requires to mark a portion of the
buffer, whereas emacs has capabilities to be smarter than that (via
hideshow or outline and some others yet), and emacs doesn't want to make
non-smart things too easy. At least that's my conclusion after some time
of using emacs and grumbling about the feature not being present :p

-- 
Nico.

Re: Arbitrary folding in emacs

[Stefan Monnier]

> outline.el has outline-flag-region, but
> (i) it doens't use an ellipsis and

It does if you enable outline-minor-mode first.

> (ii) it is not interactive.

Indeed, tho you can work around that with

   (defun my-hide-region (beg en)
     (interactive "r")
     (outline-flag-region beg end t))

But obviously, it'll be a bit crude (e.g. no commands to unhide, tho you
might be able to use reveal-mode for that).

> I think it doesn't exist because it requires to mark a portion of the
> buffer, whereas Emacs has capabilities to be smarter than that (via
> hideshow or outline and some others yet),

That wouldn't preclude us from providing the "more manual" functionality.


        Stefan

Re: Arbitrary folding in emacs

[Nicolas Richard]

Stefan Monnier <monnier@iro.umontreal.ca> writes:
> But obviously, it'll be a bit crude (e.g. no commands to unhide, tho you
> might be able to use reveal-mode for that).

Here's a "toggling" version :
(defun my-toggle-hide-region (beg end)
  "Hide region. Unless it contains already hidden text, then show it."
  (interactive "r")
  (let ((has-invisible-p
         (catch 'invisible
           (dolist (ov (overlays-in beg end))
             (when (eq 'outline (overlay-get ov 'invisible))
               (throw 'invisible t))))))
    (outline-flag-region beg end (not has-invisible-p))))

-- 
Nico.

Re: Arbitrary folding in emacs

[Tassilo Horn]

Tim Visher <tim.visher@gmail.com> writes:

>> narrowing the region is kind of opposite of what I am looking for -
>> but I'll give it a shot - I am not familiar with it.
>
> To be clear, what I believe Eli is saying is to mark the entirety of
> the buffer that you're interested in seeing, and then Calling
> narrow-to-region.

He's right, it's still the opposite.  I wants to mark what he doesn't
want to see whereas you mark what you want to see with narrowing.  His
approach has the possible benefit that you could divide the buffer into
many hidden, shown, hidden, shown,... regions.  With narrowing, it's
always hidden, shown, hidden.

Bye,
Tassilo

Re: Arbitrary folding in emacs

[Jai Dayal]

Emacs doesn't have code folding natively. You can get folding.el, though

http://git.savannah.gnu.org/cgit/emacs-tiny-tools.git/tree/lisp/other/folding.el?h=devel


On Fri, Mar 28, 2014 at 10:17 AM, Tassilo Horn <tsdh@gnu.org> wrote:

> Tim Visher <tim.visher@gmail.com> writes:
>
> >> narrowing the region is kind of opposite of what I am looking for -
> >> but I'll give it a shot - I am not familiar with it.
> >
> > To be clear, what I believe Eli is saying is to mark the entirety of
> > the buffer that you're interested in seeing, and then Calling
> > narrow-to-region.
>
> He's right, it's still the opposite.  I wants to mark what he doesn't
> want to see whereas you mark what you want to see with narrowing.  His
> approach has the possible benefit that you could divide the buffer into
> many hidden, shown, hidden, shown,... regions.  With narrowing, it's
> always hidden, shown, hidden.
>
> Bye,
> Tassilo
>
>

Re: Arbitrary folding in emacs

[Jarek Czekalski]

folding.el is what I use. The bad thing is that it is not maintained and 
bug reports (at savannah [1]) are ignored. The strict rules of using 
folding marks in folding.el (only at beginning of line) were not 
compatible with my pre-emacs files (in jEdit explicit folds were working 
perfectly). I did some hacking on folding.el and now I'm quite happy 
with it.

I'll try to contact Jari Aalto at github [2], seems like he's more 
active there.

Jarek

[1] http://savannah.nongnu.org/bugs/?40147
[2] 
https://github.com/jaalto/project--emacs-tiny-tools/tree/devel/lisp/other

W dniu 03/28/2014 03:28 PM, Jai Dayal pisze:
> Emacs doesn't have code folding natively. You can get folding.el, though
>
> http://git.savannah.gnu.org/cgit/emacs-tiny-tools.git/tree/lisp/other/folding.el?h=devel
>
>
> On Fri, Mar 28, 2014 at 10:17 AM, Tassilo Horn <tsdh@gnu.org> wrote:
>
>

Re: Arbitrary folding in emacs

[Marcin Borkowski]

Dnia 2014-03-28, o godz. 07:45:53
Tim Visher <tim.visher@gmail.com> napisał(a):

> On Fri, Mar 28, 2014 at 5:50 AM, C K Kashyap <ckkashyap@gmail.com>
> wrote:
> > narrowing the region is kind of opposite of what I am looking for -
> > but I'll give it a shot - I am not familiar with it.
> 
> I too would be interested in being able to hide away a region as vim
> is capable of, but I've never heard of a feature like that in Emacs.
> It might be a very useful extension to hs-minor-mode.

Has anyone tried this: http://www.emacswiki.org/emacs/HideRegion ?

> In Christ,
> 
> Timmy V.

God bless you,

-- 
Marcin Borkowski
http://octd.wmi.amu.edu.pl/en/Marcin_Borkowski
Adam Mickiewicz University

Re: Arbitrary folding in emacs

[Tim Visher]

On Sat, Mar 29, 2014 at 2:42 AM, Marcin Borkowski <mbork@wmi.amu.edu.pl> wrote:
> Dnia 2014-03-28, o godz. 07:45:53
> Tim Visher <tim.visher@gmail.com> napisał(a):
>
>> On Fri, Mar 28, 2014 at 5:50 AM, C K Kashyap <ckkashyap@gmail.com>
>> wrote:
>> > narrowing the region is kind of opposite of what I am looking for -
>> > but I'll give it a shot - I am not familiar with it.
>>
>> I too would be interested in being able to hide away a region as vim
>> is capable of, but I've never heard of a feature like that in Emacs.
>> It might be a very useful extension to hs-minor-mode.
>
> Has anyone tried this: http://www.emacswiki.org/emacs/HideRegion ?

That looks really cool.

>> In Christ,
>>
>> Timmy V.
>
> God bless you,

You as well. :)

--

In Christ,

Timmy V.

http://blog.twonegatives.com/
http://five.sentenc.es/ -- Spend less time on mail

Re: Arbitrary folding in emacs

[Thien-Thi Nguyen]

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() C K Kashyap <ckkashyap@gmail.com>
() Fri, 28 Mar 2014 14:36:47 +0530

   I am trying to go-over a huge c++ file. In vim, I can collapse a
   huge set of lines by simply highlighting it an then doing a zf.
   I was wondering if I can do something similar in emacs - rather
   how I can do it in emacs.

   I tried hs-minor-mode but it appears to have pre-defined notions
   of "foldable" blocks.

You can (ab)use ‘hs-hide-comment-region’, like so:

 (defun hs-hide-region (beg end)
   "Basically (hs-hide-comment-region BEG END), as a command."
   (interactive "r")
   (hs-hide-comment-region beg end))

Does that work for you?  I tested lightly w/ Emacs Lisp only.
(See also ‘hs-set-up-overlay’.)

-- 
Thien-Thi Nguyen
   GPG key: 4C807502
   (if you're human and you know it)
      read my lisp: (responsep (questions 'technical)
                               (not (via 'mailing-list)))
                     => nil

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Re: Arbitrary folding in emacs

[Jai Dayal]

after enabling hs-minor-mode, hs-hide-block works too, right?


On Fri, Mar 28, 2014 at 4:00 PM, Thien-Thi Nguyen <ttn@gnu.org> wrote:

> () C K Kashyap <ckkashyap@gmail.com>
> () Fri, 28 Mar 2014 14:36:47 +0530
>
>    I am trying to go-over a huge c++ file. In vim, I can collapse a
>    huge set of lines by simply highlighting it an then doing a zf.
>    I was wondering if I can do something similar in emacs - rather
>    how I can do it in emacs.
>
>    I tried hs-minor-mode but it appears to have pre-defined notions
>    of "foldable" blocks.
>
> You can (ab)use 'hs-hide-comment-region', like so:
>
>  (defun hs-hide-region (beg end)
>    "Basically (hs-hide-comment-region BEG END), as a command."
>    (interactive "r")
>    (hs-hide-comment-region beg end))
>
> Does that work for you?  I tested lightly w/ Emacs Lisp only.
> (See also 'hs-set-up-overlay'.)
>
> --
> Thien-Thi Nguyen
>    GPG key: 4C807502
>    (if you're human and you know it)
>       read my lisp: (responsep (questions 'technical)
>                                (not (via 'mailing-list)))
>                      => nil
>

Re: Arbitrary folding in emacs

[Andreas Röhler]

Am 28.03.2014 10:06, schrieb C K Kashyap:
> I am trying to go-over a huge c++ file. In vim, I can collapse a huge set
> of lines by simply highlighting it an then doing a zf. I was wondering if I
> can do something similar in emacs - rather how I can do it in emacs.
>
> I tried hs-minor-mode but it appears to have pre-defined notions of
> "foldable" blocks.
>
> Regards,
> Kashyap
>

If hs-minor-mode is on,
you could use ar-hide-region-atpt, which is provided here:

https://launchpad.net/s-x-emacs-werkstatt

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