[PATCH 13/19] tree_entry_interesting(): optimize fnmatch when base is matched

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

If base is already matched, skip that part when calling
fnmatch(). This happens quite often when users start a command from
worktree's subdirectory and prefix is usually prepended to all
pathspecs.

Signed-off-by: Nguyễn Thái Ngọc Duy <pclouds@gmail.com>
---
 t/t4010-diff-pathspec.sh |   14 ++++++++++++++
 tree-walk.c              |   15 +++++++++++++++
 2 files changed, 29 insertions(+), 0 deletions(-)

diff --git a/t/t4010-diff-pathspec.sh b/t/t4010-diff-pathspec.sh
index 94df7ae..4b120f8 100755
--- a/t/t4010-diff-pathspec.sh
+++ b/t/t4010-diff-pathspec.sh
@@ -70,4 +70,18 @@ test_expect_success 'diff-tree pathspec' '
 	test_cmp expected current
 '
 
+EMPTY_TREE=4b825dc642cb6eb9a060e54bf8d69288fbee4904
+
+test_expect_success 'diff-tree with wildcard shows dir also matches' '
+	git diff-tree --name-only $EMPTY_TREE $tree -- "f*" >result &&
+	echo file0 >expected &&
+	test_cmp expected result
+'
+
+test_expect_success 'diff-tree -r with wildcard' '
+	git diff-tree -r --name-only $EMPTY_TREE $tree -- "*file1" >result &&
+	echo path1/file1 >expected &&
+	test_cmp expected result
+'
+
 test_done
diff --git a/tree-walk.c b/tree-walk.c
index b5ad42b..e1a18fc 100644
--- a/tree-walk.c
+++ b/tree-walk.c
@@ -597,6 +597,21 @@ int tree_entry_interesting(const struct name_entry *entry,
 					match + baselen, matchlen - baselen,
 					&never_interesting))
 				return 1;
+
+			if (item->has_wildcard) {
+				never_interesting = 0;
+				if (!fnmatch(match + baselen, entry->path, 0))
+					return 1;
+
+				/*
+				 * Match all directories. We'll try to
+				 * match files later on.
+				 */
+				if (ps->recursive && S_ISDIR(entry->mode))
+					return 1;
+			}
+
+			continue;
 		}
 
 match_wildcards:
-- 
1.7.3.3.476.g10a82