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67 lines
1.7 KiB
Markdown
67 lines
1.7 KiB
Markdown
# Go CLI Library [](https://godoc.org/github.com/mitchellh/cli)
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cli is a library for implementing powerful command-line interfaces in Go.
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cli is the library that powers the CLI for
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[Packer](https://github.com/mitchellh/packer),
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[Serf](https://github.com/hashicorp/serf),
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[Consul](https://github.com/hashicorp/consul),
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[Vault](https://github.com/hashicorp/vault),
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[Terraform](https://github.com/hashicorp/terraform), and
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[Nomad](https://github.com/hashicorp/nomad).
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## Features
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* Easy sub-command based CLIs: `cli foo`, `cli bar`, etc.
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* Support for nested subcommands such as `cli foo bar`.
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* Optional support for default subcommands so `cli` does something
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other than error.
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* Support for shell autocompletion of subcommands, flags, and arguments
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with callbacks in Go. You don't need to write any shell code.
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* Automatic help generation for listing subcommands
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* Automatic help flag recognition of `-h`, `--help`, etc.
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* Automatic version flag recognition of `-v`, `--version`.
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* Helpers for interacting with the terminal, such as outputting information,
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asking for input, etc. These are optional, you can always interact with the
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terminal however you choose.
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* Use of Go interfaces/types makes augmenting various parts of the library a
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piece of cake.
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## Example
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Below is a simple example of creating and running a CLI
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```go
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package main
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import (
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"log"
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"os"
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"github.com/mitchellh/cli"
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)
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func main() {
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c := cli.NewCLI("app", "1.0.0")
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c.Args = os.Args[1:]
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c.Commands = map[string]cli.CommandFactory{
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"foo": fooCommandFactory,
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"bar": barCommandFactory,
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}
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exitStatus, err := c.Run()
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if err != nil {
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log.Println(err)
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}
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os.Exit(exitStatus)
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}
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```
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