[PATCH v5 11/12] wildmatch: make /**/ match zero or more directories

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

"foo/**/bar" matches "foo/x/bar", "foo/x/y/bar"... but not
"foo/bar". We make a special case, when foo/**/ is detected (and
"foo/" part is already matched), try matching "bar" with the rest of
the string.

"Match one or more directories" semantics can be easily achieved using
"foo/*/**/bar".

This also makes "**/foo" match "foo" in addition to "x/foo",
"x/y/foo"..

Signed-off-by: Nguyễn Thái Ngọc Duy <pclouds@gmail.com>
---
 t/t3070-wildmatch.sh |  8 +++++++-
 wildmatch.c          | 17 +++++++++++++++++
 2 files changed, 24 insertions(+), 1 deletion(-)

diff --git a/t/t3070-wildmatch.sh b/t/t3070-wildmatch.sh
index 15848d5..e6ad6f4 100755
--- a/t/t3070-wildmatch.sh
+++ b/t/t3070-wildmatch.sh
@@ -63,11 +63,17 @@ match 1 1 ']' ']'
 match 0 0 'foo/baz/bar' 'foo*bar'
 match 0 0 'foo/baz/bar' 'foo**bar'
 match 0 1 'foobazbar' 'foo**bar'
+match 1 1 'foo/baz/bar' 'foo/**/bar'
+match 1 0 'foo/baz/bar' 'foo/**/**/bar'
+match 1 0 'foo/b/a/z/bar' 'foo/**/bar'
+match 1 0 'foo/b/a/z/bar' 'foo/**/**/bar'
+match 1 0 'foo/bar' 'foo/**/bar'
+match 1 0 'foo/bar' 'foo/**/**/bar'
 match 0 0 'foo/bar' 'foo?bar'
 match 0 0 'foo/bar' 'foo[/]bar'
 match 0 0 'foo/bar' 'f[^eiu][^eiu][^eiu][^eiu][^eiu]r'
 match 1 1 'foo-bar' 'f[^eiu][^eiu][^eiu][^eiu][^eiu]r'
-match 0 0 'foo' '**/foo'
+match 1 0 'foo' '**/foo'
 match 1 x '/foo' '**/foo'
 match 1 0 'bar/baz/foo' '**/foo'
 match 0 0 'bar/baz/foo' '*/foo'
diff --git a/wildmatch.c b/wildmatch.c
index 7209f26..35c34ac 100644
--- a/wildmatch.c
+++ b/wildmatch.c
@@ -90,6 +90,23 @@ static int dowild(const uchar *p, const uchar *text, int force_lower_case)
 		if ((prev_p == text || *prev_p == '/') ||
 		    (*p == '\0' || *p == '/' ||
 		     (p[0] == '\\' && p[1] == '/'))) {
+			/*
+			 * Assuming we already match 'foo/' and are at
+			 * <star star slash>, just assume it matches
+			 * nothing and go ahead match the rest of the
+			 * pattern with the remaining string. This
+			 * helps make foo/<*><*>/bar (<> because
+			 * otherwise it breaks C comment syntax) match
+			 * both foo/bar and foo/a/bar.
+			 *
+			 * Crazy patterns like /<*><*>/<*><*>/ are
+			 * treated like /<*><*>/. But undefined
+			 * behavior is even appropriate for people
+			 * writing such a pattern.
+			 */
+			if (p[0] == '/' &&
+			    dowild(p + 1, text, force_lower_case) == MATCH)
+				return MATCH;
 		    special = TRUE;
 		} else
 		    return ABORT_MALFORMED;
-- 
1.8.0.rc2.11.g2b79d01