[PATCH/RFC] git.c: support "!!" aliases that do not move cwd

["Nguyễn Thái Ngọc Duy" <pclouds@gmail.com>]

Throwing something at the mailing list to see if anybody is
interested.

Current '!' aliases move cwd to $GIT_WORK_TREE first, which could make
handling path arguments hard because they are relative to the original
cwd. We set GIT_PREFIX to work around it, but I still think it's more
natural to keep cwd where it is.

We have a way to do that now after 441981b (git: simplify environment
save/restore logic - 2016-01-26). It's just a matter of choosing the
right syntax. I'm going with '!!'. I'm not very happy with it. But I
do like this type of alias.

Signed-off-by: Nguyễn Thái Ngọc Duy <pclouds@gmail.com>
---
 git.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/git.c b/git.c
index 296857a..4c1dcf4 100644
--- a/git.c
+++ b/git.c
@@ -252,6 +252,10 @@ static int handle_alias(int *argcp, const char ***argv)
 
 			alias_string++;
 			commit_pager_choice();
+			if (*alias_string == '!') {
+				keep_cwd = 0;
+				alias_string++;
+			}
 			restore_env(keep_cwd);
 
 			child.use_shell = 1;
-- 
2.8.2.524.g6ff3d78