Support renaming local-only branches (#2710)

features/rename_branch/features/local_branch.feature

@@ -0,0 +1,32 @@
+Feature: rename a local-only branch
+
+  Background:
+    Given the current branch is a local feature branch "old"
+    And the commits
+      | BRANCH | LOCATION      | MESSAGE     |
+      | main   | local, origin | main commit |
+      | old    | local         | old commit  |
+    When I run "git-town rename-branch new"
+
+  Scenario: result
+    Then it runs the commands
+      | BRANCH | COMMAND                  |
+      | old    | git fetch --prune --tags |
+      |        | git branch new old       |
+      |        | git checkout new         |
+      | new    | git branch -D old        |
+    And the current branch is now "new"
+    And now these commits exist
+      | BRANCH | LOCATION      | MESSAGE     |
+      | main   | local, origin | main commit |
+      | new    | local         | old commit  |
+
+  Scenario: undo
+    When I run "git-town undo"
+    Then it runs the commands
+      | BRANCH | COMMAND                               |
+      | new    | git branch old {{ sha 'old commit' }} |
+      |        | git checkout old                      |
+      | old    | git branch -D new                     |
+    And the current branch is now "old"
+    And the initial branches and hierarchy exist

src/cmd/rename_branch.go

@@ -143,7 +143,7 @@ func determineRenameBranchConfig(args []string, forceFlag bool, repo *execute.Op
 	if oldBranch == nil {
 		return nil, branchesSnapshot, stashSnapshot, false, fmt.Errorf(messages.BranchDoesntExist, oldBranchName)
 	}
-	if oldBranch.SyncStatus != domain.SyncStatusUpToDate {
+	if oldBranch.SyncStatus != domain.SyncStatusUpToDate && oldBranch.SyncStatus != domain.SyncStatusLocalOnly {
 		return nil, branchesSnapshot, stashSnapshot, false, fmt.Errorf(messages.RenameBranchNotInSync, oldBranchName)
 	}
 	if branches.All.HasLocalBranch(newBranchName) {