Merge branch 'nd/pathspec-recursion-cleanup'

* nd/pathspec-recursion-cleanup:
  diff-index: enable recursive pathspec matching in unpack_trees
  Document limited recursion pathspec matching with wildcards

Author: gitster

Documentation/git-grep.txt

@@ -79,6 +79,9 @@ OPTIONS
 --max-depth <depth>::
 	For each <pathspec> given on command line, descend at most <depth>
 	levels of directories. A negative value means no limit.
+	This option is ignored if <pathspec> contains active wildcards.
+	In other words if "a*" matches a directory named "a*",
+	"*" is matched literally so --max-depth is still effective.
 
 -w::
 --word-regexp::

diff-lib.c

@@ -469,6 +469,8 @@ static int diff_cache(struct rev_info *revs,
 	opts.src_index = &the_index;
 	opts.dst_index = NULL;
 	opts.pathspec = &revs->diffopt.pathspec;
+	opts.pathspec->recursive = 1;
+	opts.pathspec->max_depth = -1;
 
 	init_tree_desc(&t, tree->buffer, tree->size);
 	return unpack_trees(1, &t, &opts);

t/t4010-diff-pathspec.sh

@@ -47,6 +47,14 @@ test_expect_success \
     'git diff-index --cached $tree -- path1/ >current &&
      compare_diff_raw current expected'
 
+cat >expected <<\EOF
+:100644 100644 766498d93a4b06057a8e49d23f4068f1170ff38f 0a41e115ab61be0328a19b29f18cdcb49338d516 M	path1/file1
+EOF
+test_expect_success \
+    '"*file1" should show path1/file1' \
+    'git diff-index --cached $tree -- "*file1" >current &&
+     compare_diff_raw current expected'
+
 cat >expected <<\EOF
 :100644 100644 766498d93a4b06057a8e49d23f4068f1170ff38f 0a41e115ab61be0328a19b29f18cdcb49338d516 M	file0
 EOF

tree-walk.c

@@ -661,6 +661,9 @@ enum interesting tree_entry_interesting(const struct name_entry *entry,
 		/*
 		 * Match all directories. We'll try to match files
 		 * later on.
+		 * max_depth is ignored but we may consider support it
+		 * in future, see
+		 * http://thread.gmane.org/gmane.comp.version-control.git/163757/focus=163840
 		 */
 		if (ps->recursive && S_ISDIR(entry->mode))
 			return entry_interesting;