[PATCH RFC] Convert ce_path_match() use to match_pathspec()

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

Back in history, ce_path_match() was first introduced in commit
fdee7d07ba6c79b3e5125e96adbe1d9c3e75ce1d, in diff-cache.c. It seems
to be used to handle pathspec that we have today. But it did not
support wildcards.

About one year later, match_pathspec() was introduced as match() in
commit 0d78153952e70c21e94dc6b7eefcb2ac5337a902, builtin-add.c. This
version supported wildcards.

For some reasons diff code did not get converted to use
match_pathspec(). So diff commands do not understand wildcards. I was
not here that time to know the reasons. But I find it quite handy to
do "git diff -- '*.sh'", just like the rest of git commands.

Hence this patch, which simply calls match_pathspec() inside
ce_path_match(). With this, "git diff-files" and "git diff-index" now
support wildcards. "git diff-tree" does not because it does not use
ce_path_match().

"git update-index --again" is also affected (in a good way hopefully)

Signed-off-by: Nguyễn Thái Ngọc Duy <pclouds@gmail.com>
---
 So.. comments?

 read-cache.c |   20 +-------------------
 1 files changed, 1 insertions(+), 19 deletions(-)

diff --git a/read-cache.c b/read-cache.c
index 3f58711..d2daf01 100644
--- a/read-cache.c
+++ b/read-cache.c
@@ -677,28 +677,10 @@ int ce_same_name(struct cache_entry *a, struct cache_entry *b)
 
 int ce_path_match(const struct cache_entry *ce, const char **pathspec)
 {
-	const char *match, *name;
-	int len;
-
 	if (!pathspec)
 		return 1;
 
-	len = ce_namelen(ce);
-	name = ce->name;
-	while ((match = *pathspec++) != NULL) {
-		int matchlen = strlen(match);
-		if (matchlen > len)
-			continue;
-		if (memcmp(name, match, matchlen))
-			continue;
-		if (matchlen && name[matchlen-1] == '/')
-			return 1;
-		if (name[matchlen] == '/' || !name[matchlen])
-			return 1;
-		if (!matchlen)
-			return 1;
-	}
-	return 0;
+	return match_pathspec(pathspec, ce->name, ce_namelen(ce), 0, NULL);
 }
 
 /*
-- 
test