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 <pclo...@gmail.com>
---
 builtin/clean.c          |  2 +-
 builtin/ls-files.c       |  5 +++--
 dir.c                    |  4 ++--
 dir.h                    | 10 +++++++---
 rerere.c                 |  2 +-
 t/t4010-diff-pathspec.sh | 17 +++++++++++++++++
 6 files changed, 31 insertions(+), 9 deletions(-)

diff --git a/builtin/clean.c b/builtin/clean.c
index f59c753..4c9680a 100644
--- a/builtin/clean.c
+++ b/builtin/clean.c
@@ -962,7 +962,7 @@ int cmd_clean(int argc, const char **argv, const char 
*prefix)
 
                if (pathspec.nr)
                        matches = match_pathspec(&pathspec, ent->name,
-                                                len, 0, NULL);
+                                                len, 0, NULL, 0);
 
                if (S_ISDIR(st.st_mode)) {
                        if (remove_directories || (matches == MATCHED_EXACTLY)) 
{
diff --git a/builtin/ls-files.c b/builtin/ls-files.c
index 02db0e1..47c3880 100644
--- a/builtin/ls-files.c
+++ b/builtin/ls-files.c
@@ -140,7 +140,8 @@ static void show_ce_entry(const char *tag, const struct 
cache_entry *ce)
                die("git ls-files: internal error - cache entry not superset of 
prefix");
 
        if (!match_pathspec(&pathspec, ce->name, ce_namelen(ce),
-                           len, ps_matched))
+                           len, ps_matched,
+                           S_ISDIR(ce->ce_mode) || S_ISGITLINK(ce->ce_mode)))
                return;
 
        if (tag && *tag && show_valid_bit &&
@@ -197,7 +198,7 @@ static void show_ru_info(void)
                if (len < max_prefix_len)
                        continue; /* outside of the prefix */
                if (!match_pathspec(&pathspec, path, len,
-                                   max_prefix_len, ps_matched))
+                                   max_prefix_len, ps_matched, 0))
                        continue; /* uninterested */
                for (i = 0; i < 3; i++) {
                        if (!ui->mode[i])
diff --git a/dir.c b/dir.c
index 7b50072..2fd0ebd 100644
--- a/dir.c
+++ b/dir.c
@@ -360,10 +360,10 @@ static int do_match_pathspec(const struct pathspec *ps,
 
 int match_pathspec(const struct pathspec *ps,
                   const char *name, int namelen,
-                  int prefix, char *seen)
+                  int prefix, char *seen, int is_dir)
 {
        int positive, negative;
-       unsigned flags = 0;
+       unsigned flags = is_dir ? DO_MATCH_DIRECTORY : 0;
        positive = do_match_pathspec(ps, name, namelen,
                                     prefix, seen, flags);
        if (!(ps->magic & PATHSPEC_EXCLUDE) || !positive)
diff --git a/dir.h b/dir.h
index c31ed9a..55e5345 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
diff --git a/rerere.c b/rerere.c
index 34a21c4..d55aa8a 100644
--- a/rerere.c
+++ b/rerere.c
@@ -673,7 +673,7 @@ int rerere_forget(struct pathspec *pathspec)
        for (i = 0; i < conflict.nr; i++) {
                struct string_list_item *it = &conflict.items[i];
                if (!match_pathspec(pathspec, it->string,
-                                   strlen(it->string), 0, NULL))
+                                   strlen(it->string), 0, NULL, 0))
                        continue;
                rerere_forget_one_path(it->string, &merge_rr);
        }
diff --git a/t/t4010-diff-pathspec.sh b/t/t4010-diff-pathspec.sh
index af5134b..167af53 100755
--- a/t/t4010-diff-pathspec.sh
+++ b/t/t4010-diff-pathspec.sh
@@ -110,4 +110,21 @@ test_expect_success 'diff-tree -r with wildcard' '
        test_cmp expected result
 '
 
+test_expect_success 'setup submodules' '
+       test_tick &&
+       git init submod &&
+       ( cd submod && test_commit first; ) &&
+       git add submod &&
+       git commit -m first &&
+       ( cd submod && test_commit second; ) &&
+       git add submod &&
+       git commit -m second
+'
+
+test_expect_success 'diff-cache ignores trailing slash on submodule path' '
+       git diff --name-only HEAD^ submod >expect &&
+       git diff --name-only HEAD^ submod/ >actual &&
+       test_cmp expect actual
+'
+
 test_done
-- 
1.8.5.2.240.g8478abd

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