[RFC 1/2] grep: only add delimiter if there isn't one already

[Stefan Hajnoczi <stefanha@xxxxxxxxxx>]

git-grep(1) output does not follow git's own syntax:

  $ git grep malloc v2.9.3:
  v2.9.3::Makefile:       COMPAT_CFLAGS += -Icompat/nedmalloc
  $ git show v2.9.3::Makefile
  fatal: Path ':Makefile' does not exist in 'v2.9.3'

This patch avoids emitting the unnecessary ':' delimiter if the name
already ends with ':' or '/':

  $ git grep malloc v2.9.3:
  v2.9.3:Makefile:       COMPAT_CFLAGS += -Icompat/nedmalloc
  $ git show v2.9.3:Makefile
  (succeeds)

Signed-off-by: Stefan Hajnoczi <stefanha@xxxxxxxxxx>
---
 builtin/grep.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/builtin/grep.c b/builtin/grep.c
index 462e607..3643d8a 100644
--- a/builtin/grep.c
+++ b/builtin/grep.c
@@ -490,7 +490,11 @@ static int grep_object(struct grep_opt *opt, const struct pathspec *pathspec,
 		strbuf_init(&base, PATH_MAX + len + 1);
 		if (len) {
 			strbuf_add(&base, name, len);
-			strbuf_addch(&base, ':');
+
+			/* Add a delimiter if there isn't one already */
+			if (name[len - 1] != '/' && name[len - 1] != ':') {
+				strbuf_addch(&base, ':');
+			}
 		}
 		init_tree_desc(&tree, data, size);
 		hit = grep_tree(opt, pathspec, &tree, &base, base.len,
-- 
2.9.3