pathspec: pass directory indicator to match_pathspec_item()

This patch activates the DO_MATCH_DIRECTORY code in m_p_i(), which
makes "git diff HEAD submodule/" and "git diff HEAD submodule" produce
the same output. Previously only the version without trailing slash
returns the difference (if any).

That's the effect of new ce_path_match(). dir_path_match() is not
executed by the new tests. And it should not introduce regressions.

Previously if path "dir/" is passed in with pathspec "dir/", they
obviously match. With new dir_path_match(), the path becomes
_directory_ "dir" vs pathspec "dir/", which is not executed by the old
code path in m_p_i(). The new code path is executed and produces the
same result.

The other case is pathspec "dir" and path "dir/" is now turned to
"dir" (with DO_MATCH_DIRECTORY). Still the same result before or after
the patch.

So why change? Because of the next patch about clean.c.

Signed-off-by: Nguyễn Thái Ngọc Duy <pclouds@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

1 files changed, 7 insertions, 3 deletions

diff --git a/dir.h b/dir.h
index c31ed9af78..55e53456af 100644
--- a/dir.h
+++ b/dir.h
@@ -134,7 +134,7 @@ extern int no_wildcard(const char *string);
 extern char *common_prefix(const struct pathspec *pathspec);
 extern int match_pathspec(const struct pathspec *pathspec,
 			  const char *name, int namelen,
-			  int prefix, char *seen);
+			  int prefix, char *seen, int is_dir);
 extern int within_depth(const char *name, int namelen, int depth, int max_depth);
 
 extern int fill_directory(struct dir_struct *dir, const struct pathspec *pathspec);
@@ -209,14 +209,18 @@ static inline int ce_path_match(const struct cache_entry *ce,
 				const struct pathspec *pathspec,
 				char *seen)
 {
-	return match_pathspec(pathspec, ce->name, ce_namelen(ce), 0, seen);
+	return match_pathspec(pathspec, ce->name, ce_namelen(ce), 0, seen,
+			      S_ISDIR(ce->ce_mode) || S_ISGITLINK(ce->ce_mode));
 }
 
 static inline int dir_path_match(const struct dir_entry *ent,
 				 const struct pathspec *pathspec,
 				 int prefix, char *seen)
 {
-	return match_pathspec(pathspec, ent->name, ent->len, prefix, seen);
+	int has_trailing_dir = ent->len && ent->name[ent->len - 1] == '/';
+	int len = has_trailing_dir ? ent->len - 1 : ent->len;
+	return match_pathspec(pathspec, ent->name, len, prefix, seen,
+			      has_trailing_dir);
 }
 
 #endif