Adding Commands With the Cobra Generator

We will build our simple calculator on top of the skeleton. Next, we will add a couple more options like pre-run and post-run hooks that we skipped over in the previous lesson. Let’s start by understanding what the Cobra generator is, how it works, and when you should use it.

Adding commands to the application

The cobra add will create new commands for us, and even hook it up to a parent command. By default, the parent is the root command. Our calculator application needs two commands add and subtract.

If you want to follow along, there is a terminal window at the bottom of the lesson that is already set up with the Cobra application skeleton. Feel free to type in the commands and check out the results for yourself.

Let’s create the calculator’s add command using Cobra’s add command. Don’t be confused. Our calculator command to add two numbers is ...