Move old state.yml files to the state dir

pkg/config/app_config.go

@@ -269,7 +269,7 @@ func (c *AppConfig) SaveAppState() error {
 		return err
 	}
 
-	filepath, err := stateFilePath("state.yml")
+	filepath, err := stateFilePath(stateFileName)
 	if err != nil {
 		return err
 	}
@@ -283,11 +283,15 @@ func (c *AppConfig) SaveAppState() error {
 	return err
 }
 
+var stateFileName = "state.yml"
+
 // loadAppState loads recorded AppState from file
 func loadAppState() (*AppState, error) {
+	_ = migrateStateFile("")
+
 	appState := getDefaultAppState()
 
-	filepath, err := stateFilePath("state.yml")
+	filepath, err := stateFilePath(stateFileName)
 	if err != nil {
 		return nil, err
 	}
@@ -309,6 +313,25 @@ func loadAppState() (*AppState, error) {
 	return appState, nil
 }
 
+// Do any backward-compatibility migrations of things that have changed over time
+func migrateStateFile(filename string) error {
+	path, err := configFilePath(filename)
+	if err != nil {
+		return nil
+	}
+
+	if _, err := os.Stat(path); os.IsNotExist(err) {
+		return nil
+	}
+
+	targetPath, err := stateFilePath(filename)
+	if err != nil {
+		return err
+	}
+
+	return os.Rename(path, targetPath)
+}
+
 // AppState stores data between runs of the app like when the last update check
 // was performed and which other repos have been checked out
 type AppState struct {