Add jumpable information on dir

Author: sapk

tree_entry.go

@@ -66,6 +66,39 @@ func (te *TreeEntry) IsSubModule() bool {
 	return te.mode == ENTRY_MODE_COMMIT
 }
 
+func (te *TreeEntry) JumpableName() string {
+	entry := te
+	for entry.IsJumpableDir() {
+		tree, _ := entry.ptree.SubTree(entry.name)
+		entries, _ := tree.ListEntries()
+		entry = entries[0]
+	}
+	return entry.name
+}
+func (te *TreeEntry) JumpablePath() string {
+	path := ""
+	entry := te
+	for entry.IsJumpableDir() {
+		path += entry.name + "/"
+		tree, _ := entry.ptree.SubTree(entry.name)
+		entries, _ := tree.ListEntries()
+		entry = entries[0]
+	}
+	return path
+}
+
+func (te *TreeEntry) IsJumpableDir() bool {
+	if te.IsSubModule() || !te.IsDir() {
+		return false
+	}
+	tree, err := te.ptree.SubTree(te.name)
+	if err != nil {
+		return false
+	}
+	entries, err := tree.ListEntries()
+	return len(entries) == 1 //TODO
+}
+
 func (te *TreeEntry) IsDir() bool {
 	return te.mode == ENTRY_MODE_TREE
 }