Implement rename command

pkg/cmd/rename.go

+package cmd
+
+import (
+	"fmt"
+	"os"
+
+	cli "github.com/spf13/cobra"
+
+	"github.com/tmrts/boilr/pkg/boilr"
+	"github.com/tmrts/boilr/pkg/util/exit"
+	"github.com/tmrts/boilr/pkg/util/validate"
+)
+
+func renameTemplate(oldPath, newPath string) error {
+	if err := os.Rename(oldPath, newPath); err != nil {
+		return err
+	}
+
+	return nil
+}
+
+// Rename contains the cli-command for renaming templates in the template registry.
+var Rename = &cli.Command{
+	Hidden: true,
+	Use:    "rename <old-template-name> <new-template-name>",
+	Short:  "Rename a project template",
+	Run: func(c *cli.Command, args []string) {
+		MustValidateArgs(args, []validate.Argument{
+			{"old-template-name", validate.UnixPath},
+			{"new-template-name", validate.UnixPath},
+		})
+
+		tmplName, newTmplName := args[0], args[1]
+
+		if ok, err := TemplateInRegistry(tmplName); err != nil {
+			exit.Fatal(fmt.Errorf("rename: %s", err))
+		} else if !ok {
+			exit.Fatal(fmt.Errorf("Template %q couldn't be found in the template registry", tmplName))
+		}
+
+		tmplPath, err := boilr.TemplatePath(tmplName)
+		if err != nil {
+			exit.Fatal(fmt.Errorf("rename: %s", err))
+		}
+
+		newTmplPath, err := boilr.TemplatePath(newTmplName)
+		if err != nil {
+			exit.Fatal(fmt.Errorf("rename: %s", err))
+		}
+
+		if err := renameTemplate(tmplPath, newTmplPath); err != nil {
+			exit.Error(fmt.Errorf("rename: %s", err))
+		}
+
+		exit.OK("Successfully renamed the template %q to %q", tmplName, newTmplName)
+	},
+}

pkg/cmd/root.go

@@ -17,24 +17,26 @@ func Run() {
 	Init.PersistentFlags().BoolP("force", "f", false, "Recreate directories if they exist")
 	Root.AddCommand(Init)
 
-	Use.PersistentFlags().BoolP("use-defaults", "f", false, "Uses default values in project.json instead of prompting the user")
-	Root.AddCommand(Use)
-
-	Save.PersistentFlags().BoolP("force", "f", false, "Overwrite existing template with the same name")
-	Root.AddCommand(Save)
+	Root.AddCommand(Delete)
 
 	Download.PersistentFlags().BoolP("force", "f", false, "Overwrite existing template with the same name")
 	Root.AddCommand(Download)
 
-	Root.AddCommand(Delete)
-
 	Root.AddCommand(List)
 
+	Root.AddCommand(Rename)
+
+	Root.AddCommand(Report)
+
+	Save.PersistentFlags().BoolP("force", "f", false, "Overwrite existing template with the same name")
+	Root.AddCommand(Save)
+
+	Use.PersistentFlags().BoolP("use-defaults", "f", false, "Uses default values in project.json instead of prompting the user")
+	Root.AddCommand(Use)
+
 	Root.AddCommand(Validate)
 
 	Root.AddCommand(Version)
 
-	Root.AddCommand(Report)
-
 	Root.Execute()
 }