changed git config determination to go-git (#41) [continue #45] (#62)

vendor/gopkg.in/src-d/go-git.v4/config/refspec.go

@@ -18,7 +18,7 @@ var (
 	ErrRefSpecMalformedWildcard  = errors.New("malformed refspec, mismatched number of wildcards")
 )
 
-// RefSpec is a mapping from local branches to remote references
+// RefSpec is a mapping from local branches to remote references.
 // The format of the refspec is an optional +, followed by <src>:<dst>, where
 // <src> is the pattern for references on the remote side and <dst> is where
 // those references will be written locally. The + tells Git to update the
@@ -99,11 +99,11 @@ func (s RefSpec) matchGlob(n plumbing.ReferenceName) bool {
 
 	var prefix, suffix string
 	prefix = src[0:wildcard]
-	if len(src) < wildcard {
-		suffix = src[wildcard+1 : len(suffix)]
+	if len(src) > wildcard+1 {
+		suffix = src[wildcard+1:]
 	}
 
-	return len(name) > len(prefix)+len(suffix) &&
+	return len(name) >= len(prefix)+len(suffix) &&
 		strings.HasPrefix(name, prefix) &&
 		strings.HasSuffix(name, suffix)
 }
@@ -127,6 +127,13 @@ func (s RefSpec) Dst(n plumbing.ReferenceName) plumbing.ReferenceName {
 	return plumbing.ReferenceName(dst[0:wd] + match + dst[wd+1:])
 }
 
+func (s RefSpec) Reverse() RefSpec {
+	spec := string(s)
+	separator := strings.Index(spec, refSpecSeparator)
+
+	return RefSpec(spec[separator+1:] + refSpecSeparator + spec[:separator])
+}
+
 func (s RefSpec) String() string {
 	return string(s)
 }