git mailinfo strips important context from patch subjects

[I'm not currently subscribed to the list; I'd appreciate a CC
on any replies, thanks!]

Hi,

In most of the projects I work on, the git commit message has
the affected subsystem or component in square brackets, such as

  [foo] change bar to baz

For example, with a single patch from a series produced by
git format-patch:

% head -n4 /tmp/patches/0005-sbuild-chroot_mountable-Don-t-derive-from-chroot.patch
From f01579584f1e7d77cf1e9c3306601a4cccff8c55 Mon Sep 17 00:00:00 2001
From: Roger Leigh <redacted>
Date: Fri, 10 Apr 2009 19:43:15 +0100
Subject: [PATCH 05/15] [sbuild] chroot_mountable: Don't derive from chroot

% git mailinfo </tmp/patches/0005-sbuild-chroot_mountable-Don-t-derive-from-chroot.patch /dev/null /dev/null
Author: Roger Leigh
Email: rleigh@debian.org
Subject: chroot_mountable: Don't derive from chroot
Date: Fri, 10 Apr 2009 19:43:15 +0100

The [sbuild] prefix has been dropped from the Subject, so an
important bit of context about the patch has been lost.

It's a bit of a bug that you can't round trip from a git-format-patch
to import with git-am and then not be able to produce the exact same
patch set with git-format-patch again (assuming preparing and applying
to the same point, of course).

Would it be possible to change the git-mailinfo logic to use a less
greedy pattern match so it leaves everything after
([PATCH( [0-9/])+])+ in the subject?  AFAICT this is cleanup_subject in
builtin-mailinfo.c?  Could this rather complex function not just do a
simple regex match which can also take care of stripping ([Rr]e:) ?


Thanks,
Roger

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