Adding the First Subcommand to Your Application
Powerful Command-Line Applications in Go — by Ricardo Gerardi (75 / 127)
👈 Navigating Your New Cobra Applicati on | TOC | Starting the Scan Package 👉
After initializing the application, use the Cobra generator to add subcommands to it. The generator includes a file in the cmd directory for each subcommand. Each file includes boilerplate code for the subcommand. It also adds the subcommand to its parent, forming the tree-like structure.
Add a new subcommand called hosts to your application to manage hosts in the hosts list. By default, Cobra adds this subcommand to the root command:
$ cobra add hosts
Using config file: /home/ricardo/.cobra.yaml
hosts created at /home/ricardo/pragprog.com/rggo/cobra/pScan
At this point, your application directory looks like this:
$ tree
.
├── cmd
│ ├── hosts.go
│ └── root.go
├── go.mod
├── go.sum
├── LICENSE
└── main.go
1 directory, 6 files
Edit the cmd/hosts.go file and change the command’s short description to provide a one-line summary of the command’s purpose. Edit the long description to provide additional information on how to use the command and its suboptions:
/*
Copyright © 2020 The Pragmatic Programmers, LLC
Copyrights apply to this source code.
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