bug#70820: [PATCH] Editable grep buffers

[Visuwesh]

Tags: patch

Attached patch is a proof of concept for an occur-edit-mode alike for
*grep* buffers.  It uses the new track-changes library to track the
edits made in the *grep* buffer to then finally save these edits to the
corresponding files.  I've tested this with:

    1. pure deletions: If you have a match that says "(cur-beg start"
       and you change it to "(cur- start".  This is special because
       track-changes-fetch passes equal BEG and END to
       grep-edit--track-changes-finalise.
    2. edits: something like "(cur-beg start" -> "(cur-beg start balh"
       is handled like you would expect.
    3. edits with newline: if the edit includes a newline, then that is
       reproduced.

and what is not handled currently: deleting a match line to imply
deletion of that line from the matched file.  I don't know how to handle
this currently, I need to learn the library more.

There's also definitely a million more cases that I didn't anticipate
when I wrote the logic for grep-edit--track-changes-finalise.

I'm sending the patch now to see if there's enough interest before I go
about fixing the edge cases (there's bug#52815).  If there is enough
interest, I will take a shot at implementing something like this for
xref result buffers too.



In GNU Emacs 30.0.50 (build 8, x86_64-pc-linux-gnu, X toolkit, cairo
 version 1.18.0, Xaw scroll bars) of 2024-05-07 built on astatine
Repository revision: 4b31074f5f49898ba0499a2b617cad425750eafa
Repository branch: master
Windowing system distributor 'The X.Org Foundation', version 11.0.12101011
System Description: Debian GNU/Linux trixie/sid

Configured using:
 'configure --with-sound=alsa --with-x-toolkit=lucid --with-json
 --without-xaw3d --without-gconf --without-libsystemd --with-cairo
 --with-xft'

grep-edit.diff
Description: Text Data