Cobra provides its own program that will create your application and add any commands you want. It's the easiest way to incorporate Cobra into your application.
In order to use the cobra command, compile it using the following command:
go get github.com/spf13/cobra/cobra
This will create the cobra executable under your $GOPATH/bin
directory.
The cobra init [app]
command will create your initial application code for you. It is a very powerful application that will populate your program with the right structure so you can immediately enjoy all the benefits of Cobra. It will also automatically apply the license you specify to your application.
Cobra init is pretty smart. You can provide it a full path, or simply a path similar to what is expected in the import.
cobra init github.com/spf13/newApp
Once an application is initialized, Cobra can create additional commands for you. Let's say you created an app and you wanted the following commands for it:
In your project directory (where your main.go file is) you would run the following:
cobra add serve cobra add config cobra add create -p 'configCmd'
Note: Use camelCase (not snake_case/snake-case) for command names. Otherwise, you will encounter errors. For example, cobra add add-user
is incorrect, but cobra add addUser
is valid.
Once you have run these three commands you would have an app structure similar to the following:
▾ app/ ▾ cmd/ serve.go config.go create.go main.go
At this point you can run go run main.go
and it would run your app. go run main.go serve
, go run main.go config
, go run main.go config create
along with go run main.go help serve
, etc. would all work.
Obviously you haven't added your own code to these yet. The commands are ready for you to give them their tasks. Have fun!
The Cobra generator will be easier to use if you provide a simple configuration file which will help you eliminate providing a bunch of repeated information in flags over and over.
An example ~/.cobra.yaml file:
author: Steve Francia <spf@spf13.com> license: MIT
You can specify no license by setting license
to none
or you can specify a custom license:
license: header: This file is part of {{ .appName }}. text: | {{ .copyright }} This is my license. There are many like it, but this one is mine. My license is my best friend. It is my life. I must master it as I must master my life.
You can also use built-in licenses. For example, GPLv2, GPLv3, LGPL, AGPL, MIT, 2-Clause BSD or 3-Clause BSD.