Powerful Command-Line Applications in Go

Creating the Initial To-Do Command-Line Tool

You have a working to-do API, so now you can build a command-line interface on top of it. We’ll start with an initial implementation that includes the following two features:

1. When executed without any arguments, the command will list the available to-do items.

2. When executed with one or more arguments, the command will concatenate the arguments as a new item and add it to the list.

Start by creating the file main.go in the cmd/todo directory as described in ​Organizing Your Code​.

$ cd $HOME/pragprog.com/rggo/interacting/todo/cmd/todo

Add the following code to the main.go file to define the package and imports you’ll use:

interacting/todo/cmd/todo/main.go

package main

import (