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安装

go get -v github.com/hedzr/cmdr

无论你有否使用 Go Modules,上述命令都能够有效地安装 cmdr 到你的项目中,请在你的项目的根目录中执行该命令。

当前,cmdr 兼容于 go 1.11 及其以上的版本。理论上我们可以兼容更低的 Golang 版本而无需任何修改,然而请注意更低的版本并未获得更多的测试。

要查看 cmdr 的 golang 版本兼容性矩阵,请直达 go.yml

基本用法

这里有一个极简单的应用程序:

package main
 
import (
	"fmt"
	"github.com/hedzr/cmdr"
	cmdrexamples "github.com/hedzr/cmdr-examples"
	"github.com/hedzr/cmdr/tool"
	"github.com/hedzr/log"
)
 
func main() {
	if err := cmdr.Exec(buildRootCmd(),
		cmdr.WithLogx(log.NewStdLogger()),
	); err != nil {
		cmdr.Logger.Printf("error: %+v\n", err)
	}
}
 
func buildRootCmd() (rootCmd *cmdr.RootCommand) {
	root := cmdr.
		Root(appName, cmdrexamples.Version).
		Copyright(copyright, "hedzr").
		Description(desc, longDesc).
		Examples(examples)
	rootCmd = root.RootCommand()
	soundex(root)
	return
}
 
func soundex(root cmdr.OptCmd) {
	root.NewSubCommand("soundex", "snd", "sndx", "sound").
		Description("soundex test").
		Group("Test").
		TailPlaceholder("[text1, text2, ...]").
		Action(func(cmd *cmdr.Command, args []string) (err error) {
			for ix, s := range args {
				fmt.Printf("%5d. %s => %s\n", ix, s, tool.Soundex(s))
			}
			return
		})
}
 
const (
	appName   = "getting-start"
	copyright = "getting-start is an effective devops tool"
	desc      = "getting-start is an effective devops tool. It make an demo application for `cmdr`."
	longDesc  = "getting-start is an effective devops tool. It make an demo application for `cmdr`."
	examples  = `
$ {{.AppName}} gen shell [--bash|--zsh|--auto]
  generate bash/shell completion scripts
$ {{.AppName}} gen man
  generate linux man page 1
$ {{.AppName}} --help
  show help screen.
`
)

其完成的源码可以在 examples/gs 中找到。

显示帮助屏

运行上面的程序以显示自动生成的帮助屏:

go run ./examples/getting-start

结果应该和下图基本上无差别:

image-20200713140513668

运行一个子命令

现在我们可以试试运行子命令 soundex 了:

$ go run ./examples/getting-start sndx fish bird
    0. fish => f12
    1. bird => b163

搞定了

上面走过,就可以知道 cmdr 能够干点什么了。

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