1 files changed, 53 insertions, 0 deletions
diff --git a/ref/refname/normalize.go b/ref/refname/normalize.go
new file mode 100644
index 00000000..9cbe7126
--- /dev/null
+++ b/ref/refname/normalize.go
@@ -0,0 +1,53 @@
+package refname
+
+import "strings"
+
+// Normalize collapses slashes according to what Git wants
+// then validates the normalized name.
+func Normalize(name string, options Options) (string, error) {
+	normalized := collapseSlashes(name)
+
+	err := validate(normalized, options.flags())
+	if err != nil {
+		return "", err
+	}
+
+	return normalized, nil
+}
+
+func normalizeRefPath(path string) (string, bool) {
+	components := make([]string, 0, strings.Count(path, "/")+1)
+	i := 0
+
+	for i < len(path) {
+		for i < len(path) && path[i] == '/' {
+			i++
+		}
+
+		if i == len(path) {
+			break
+		}
+
+		j := i
+		for j < len(path) && path[j] != '/' {
+			j++
+		}
+
+		component := path[i:j]
+		switch component {
+		case ".":
+		case "..":
+			if len(components) == 0 {
+				return "", false
+			}
+
+			components = components[:len(components)-1]
+		default:
+			components = append(components, component)
+		}
+
+		i = j
+	}
+
+	return strings.Join(components, "/"), true
+}