[RFC 2/2] grep: use '/' delimiter for paths

[Stefan Hajnoczi <stefanha@xxxxxxxxxx>]

If the tree contains a sub-directory then git-grep(1) output contains a
colon character instead of a path separator:

  $ git grep malloc v2.9.3:t
  v2.9.3:t:test-lib.sh:	setup_malloc_check () {
  $ git show v2.9.3:t:test-lib.sh
  fatal: Path 't:test-lib.sh' does not exist in 'v2.9.3'

This patch attempts to use the correct delimiter:

  $ git grep malloc v2.9.3:t
  v2.9.3:t/test-lib.sh:	setup_malloc_check () {
  $ git show v2.9.3:t/test-lib.sh
  (success)

This patch does not cope with @{1979-02-26 18:30:00} syntax and treats
it as a path because it contains colons.

Signed-off-by: Stefan Hajnoczi <stefanha@xxxxxxxxxx>
---
 builtin/grep.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/builtin/grep.c b/builtin/grep.c
index 3643d8a..06f8b47 100644
--- a/builtin/grep.c
+++ b/builtin/grep.c
@@ -493,7 +493,8 @@ static int grep_object(struct grep_opt *opt, const struct pathspec *pathspec,
 
 			/* Add a delimiter if there isn't one already */
 			if (name[len - 1] != '/' && name[len - 1] != ':') {
-				strbuf_addch(&base, ':');
+				/* rev: or rev:path/ */
+				strbuf_addch(&base, strchr(name, ':') ? '/' : ':');
 			}
 		}
 		init_tree_desc(&tree, data, size);
-- 
2.9.3