filter: Allow double wildcard in ChildMatch

internal/filter/filter.go

@@ -83,6 +83,12 @@ func childMatch(patterns, strs []string) (matched bool, err error) {
 		return true, nil
 	}
 
+	ok, pos := hasDoubleWildcard(patterns)
+	if ok && len(strs) >= pos {
+		// cut off at the double wildcard
+		strs = strs[:pos]
+	}
+
 	// match path against absolute pattern prefix
 	l := 0
 	if len(strs) > len(patterns) {

internal/filter/filter_test.go

@@ -83,6 +83,8 @@ var matchTests = []struct {
 	{"foo/**/bar/*.go", "bar/main.go", false},
 	{"foo/**/bar", "/home/user/foo/x/y/bar", true},
 	{"foo/**/bar", "/home/user/foo/x/y/bar/main.go", true},
+	{"foo/**/bar/**/x", "/home/user/foo/bar/x", true},
+	{"foo/**/bar/**/x", "/home/user/foo/blaaa/blaz/bar/shared/work/x", true},
 	{"user/**/important*", "/home/user/work/x/y/hidden/x", false},
 	{"user/**/hidden*/**/c", "/home/user/work/x/y/hidden/z/a/b/c", true},
 	{"c:/foo/*test.*", "c:/foo/bar/test.go", false},
@@ -107,20 +109,28 @@ func testpattern(t *testing.T, pattern, path string, shouldMatch bool) {
 
 func TestMatch(t *testing.T) {
 	for _, test := range matchTests {
-		testpattern(t, test.pattern, test.path, test.match)
+		t.Run("", func(t *testing.T) {
+			testpattern(t, test.pattern, test.path, test.match)
+		})
 
 		// Test with native path separator
 		if filepath.Separator != '/' {
-			// Test with pattern as native
 			pattern := strings.Replace(test.pattern, "/", string(filepath.Separator), -1)
-			testpattern(t, pattern, test.path, test.match)
+			// Test with pattern as native
+			t.Run("pattern-native", func(t *testing.T) {
+				testpattern(t, pattern, test.path, test.match)
+			})
 
-			// Test with path as native
 			path := strings.Replace(test.path, "/", string(filepath.Separator), -1)
-			testpattern(t, test.pattern, path, test.match)
+			t.Run("path-native", func(t *testing.T) {
+				// Test with path as native
+				testpattern(t, test.pattern, path, test.match)
+			})
 
-			// Test with both pattern and path as native
+			t.Run("both-native", func(t *testing.T) {
-			testpattern(t, pattern, path, test.match)
+				// Test with both pattern and path as native
+				testpattern(t, pattern, path, test.match)
+			})
 		}
 	}
 }
@@ -147,6 +157,16 @@ var childMatchTests = []struct {
 	{"/foo/**/baz", "/foo/bar/baz", true},
 	{"/foo/**/baz", "/foo/bar/baz/blah", true},
 	{"/foo/**/qux", "/foo/bar/baz/qux", true},
+	{"/foo/**/qux", "/foo/bar/baz", true},
+	{"/foo/**/qux", "/foo/bar/baz/boo", true},
+	{"/foo/**", "/foo/bar/baz", true},
+	{"/foo/**", "/foo/bar", true},
+	{"foo/**/bar/**/x", "/home/user/foo", true},
+	{"foo/**/bar/**/x", "/home/user/foo/bar", true},
+	{"foo/**/bar/**/x", "/home/user/foo/blaaa/blaz/bar/shared/work/x", true},
+	{"/foo/*/qux", "/foo/bar", true},
+	{"/foo/*/qux", "/foo/bar/boo", false},
+	{"/foo/*/qux", "/foo/bar/boo/xx", false},
 	{"/baz/bar", "/foo", false},
 	{"/foo", "/foo/bar", true},
 	{"/*", "/foo", true},
@@ -179,20 +199,28 @@ func testchildpattern(t *testing.T, pattern, path string, shouldMatch bool) {
 
 func TestChildMatch(t *testing.T) {
 	for _, test := range childMatchTests {
-		testchildpattern(t, test.pattern, test.path, test.match)
+		t.Run("", func(t *testing.T) {
+			testchildpattern(t, test.pattern, test.path, test.match)
+		})
 
 		// Test with native path separator
 		if filepath.Separator != '/' {
-			// Test with pattern as native
 			pattern := strings.Replace(test.pattern, "/", string(filepath.Separator), -1)
-			testchildpattern(t, pattern, test.path, test.match)
+			// Test with pattern as native
+			t.Run("pattern-native", func(t *testing.T) {
+				testchildpattern(t, pattern, test.path, test.match)
+			})
 
-			// Test with path as native
 			path := strings.Replace(test.path, "/", string(filepath.Separator), -1)
-			testchildpattern(t, test.pattern, path, test.match)
+			t.Run("path-native", func(t *testing.T) {
+				// Test with path as native
+				testchildpattern(t, test.pattern, path, test.match)
+			})
 
-			// Test with both pattern and path as native
+			t.Run("both-native", func(t *testing.T) {
-			testchildpattern(t, pattern, path, test.match)
+				// Test with both pattern and path as native
+				testchildpattern(t, pattern, path, test.match)
+			})
 		}
 	}
 }