feat: implement first version of switch

main.go

@@ -32,6 +32,16 @@ func Getwtd() (string, error) {
 	return wtd, nil
 }
 
+func GetWorktree(cwd string, name string) (string, error) {
+	wtd, err := Getwtd()
+	if err != nil {
+		return "", err
+	}
+	project := filepath.Base(cwd)
+
+	return filepath.Join(wtd, project, name), nil
+}
+
 func Init(ctx context.Context, cmd *cli.Command) error {
 	fmt.Println("init")
 	cwd, err := os.Getwd()
@@ -75,6 +85,34 @@ func Init(ctx context.Context, cmd *cli.Command) error {
 	return nil
 }
 
+func Switch(ctx context.Context, cmd *cli.Command) error {
+	branch := strings.TrimSpace(cmd.Args().Get(0))
+	if len(branch) == 0 {
+		return fmt.Errorf("no worktree name given")
+	}
+	cwd, err := os.Getwd()
+	if err != nil {
+		return err
+	}
+	worktree, err := GetWorktree(cwd, branch)
+	if err != nil {
+		return err
+	}
+
+	if !exists(worktree) {
+		if err := exec.Command("git", "worktree", "add", worktree, branch).Run(); err != nil {
+			return err
+		}
+	}
+
+	if _, err := os.Lstat(cwd); err == nil {
+		if err := os.Remove(cwd); err != nil {
+			return err
+		}
+	}
+	return os.Symlink(worktree, cwd)
+}
+
 func main() {
 	cmd := cli.Command{
 		Name: "wt",
@@ -90,7 +128,8 @@ func main() {
 				Name: "list",
 			},
 			{
-				Name: "switch",
+				Name:   "switch",
+				Action: Switch,
 			},
 		},
 	}