bug#59888: [PATCH] Add 'grep-heading-mode'

[Augusto Stoffel]

Tags: patch

This simulates the --heading option of certain grep-like tools.  The
output is like this:

--8<---------------cut here---------------start------------->8---
-*- mode: grep; default-directory: "~/Projects/emacs/" -*-
Grep started at Wed Dec  7 18:43:40

find [...] -exec grep --color=auto -i -nH --null -e test \{\} +

./nextstep/Makefile.in
104:    find ${ns_appdir} -exec test \! -e {} \; -ls

./nextstep/INSTALL
12:Tested on GNU/Linux, may work on other systems.

./nextstep/Makefile
104:    find ${ns_appdir} -exec test \! -e {} \; -ls

./nextstep/README
62:  10.6.8 (Snow Leopard) to the latest official release.
86:* This allows other Emacs developers to test their changes on the NS
--8<---------------cut here---------------end--------------->8---

0001-Add-grep-heading-mode.patch
Description: Text Data

Some comments:

1. It's necessary to insert text into the grep buffer, which is a bit
   concerning because 'compilation-filter-start' is not a marker, just a
   number.  This could cause other filter functions to get confused.
   This is why I'm adding to 'compilation-filter-hook at a higher depth.
   Perhaps there are better approaches here.

2. One could get rid of the awkward first alternative of
   `grep-heading-regexp' if there was a way to distringuish the grep
   process output from the header and footer added by grep-mode.