config: support delete refspecs (IsDelete). (#166)

Author: smola

config/refspec.go

@@ -48,6 +48,15 @@ func (s RefSpec) IsForceUpdate() bool {
 	return false
 }
 
+// IsDelete returns true if the refspec indicates a delete (empty src).
+func (s RefSpec) IsDelete() bool {
+	if s[0] == refSpecSeparator[0] {
+		return true
+	}
+
+	return false
+}
+
 // Src return the src side
 func (s RefSpec) Src() string {
 	spec := string(s)

config/refspec_test.go

@@ -23,6 +23,15 @@ func (s *RefSpecSuite) TestRefSpecIsValid(c *C) {
 	spec = RefSpec("refs/heads/master:refs/remotes/origin/master")
 	c.Assert(spec.IsValid(), Equals, true)
 
+	spec = RefSpec(":refs/heads/master")
+	c.Assert(spec.IsValid(), Equals, true)
+
+	spec = RefSpec(":refs/heads/*")
+	c.Assert(spec.IsValid(), Equals, false)
+
+	spec = RefSpec(":*")
+	c.Assert(spec.IsValid(), Equals, false)
+
 	spec = RefSpec("refs/heads/*")
 	c.Assert(spec.IsValid(), Equals, false)
 }
@@ -35,18 +44,36 @@ func (s *RefSpecSuite) TestRefSpecIsForceUpdate(c *C) {
 	c.Assert(spec.IsForceUpdate(), Equals, false)
 }
 
+func (s *RefSpecSuite) TestRefSpecIsDelete(c *C) {
+	spec := RefSpec(":refs/heads/master")
+	c.Assert(spec.IsDelete(), Equals, true)
+
+	spec = RefSpec("+refs/heads/*:refs/remotes/origin/*")
+	c.Assert(spec.IsDelete(), Equals, false)
+
+	spec = RefSpec("refs/heads/*:refs/remotes/origin/*")
+	c.Assert(spec.IsDelete(), Equals, false)
+}
+
 func (s *RefSpecSuite) TestRefSpecSrc(c *C) {
 	spec := RefSpec("refs/heads/*:refs/remotes/origin/*")
 	c.Assert(spec.Src(), Equals, "refs/heads/*")
+
+	spec = RefSpec(":refs/heads/master")
+	c.Assert(spec.Src(), Equals, "")
 }
 
 func (s *RefSpecSuite) TestRefSpecMatch(c *C) {
 	spec := RefSpec("refs/heads/master:refs/remotes/origin/master")
 	c.Assert(spec.Match(plumbing.ReferenceName("refs/heads/foo")), Equals, false)
 	c.Assert(spec.Match(plumbing.ReferenceName("refs/heads/master")), Equals, true)
+
+	spec = RefSpec(":refs/heads/master")
+	c.Assert(spec.Match(plumbing.ReferenceName("")), Equals, true)
+	c.Assert(spec.Match(plumbing.ReferenceName("refs/heads/master")), Equals, false)
 }
 
-func (s *RefSpecSuite) TestRefSpecMatchBlob(c *C) {
+func (s *RefSpecSuite) TestRefSpecMatchGlob(c *C) {
 	spec := RefSpec("refs/heads/*:refs/remotes/origin/*")
 	c.Assert(spec.Match(plumbing.ReferenceName("refs/tag/foo")), Equals, false)
 	c.Assert(spec.Match(plumbing.ReferenceName("refs/heads/foo")), Equals, true)