Question

我正在尝试了解如何使用cobra（和viper）库创建服装命令并能够使用它们。

具体而言，我试图理解并提供他们提供工作的例子。示例如下：

import(
    "github.com/spf13/cobra"
    "fmt"
    "strings"
)

func main() {

    var echoTimes int

    var cmdPrint = &cobra.Command{
        Use:   "print [string to print]",
        Short: "Print anything to the screen",
        Long:  `print is for printing anything back to the screen.
        For many years people have printed back to the screen.
        `,
        Run: func(cmd *cobra.Command, args []string) {
            fmt.Println("Print: " + strings.Join(args, " "))
        },
    }

    var cmdEcho = &cobra.Command{
        Use:   "echo [string to echo]",
        Short: "Echo anything to the screen",
        Long:  `echo is for echoing anything back.
        Echo works a lot like print, except it has a child command.
        `,
        Run: func(cmd *cobra.Command, args []string) {
            fmt.Println("Print: " + strings.Join(args, " "))
        },
    }

    var cmdTimes = &cobra.Command{
        Use:   "times [# times] [string to echo]",
        Short: "Echo anything to the screen more times",
        Long:  `echo things multiple times back to the user by providing
        a count and a string.`,
        Run: func(cmd *cobra.Command, args []string) {
            for i:=0; i < echoTimes; i++ {
                fmt.Println("Echo: " + strings.Join(args, " "))
            }
        },
    }

    cmdTimes.Flags().IntVarP(&echoTimes, "times", "t", 1, "times to echo the input")

    var rootCmd = &cobra.Command{Use: "app"}
    rootCmd.AddCommand(cmdPrint, cmdEcho)
    cmdEcho.AddCommand(cmdTimes)
    rootCmd.Execute()
}

但是，我已经在package main中为它制作了文件，而我似乎无法使其正常工作。我知道rootCmd不是可执行的。但是，在我看来，Use字段表现不一致（据我所知）。我试图了解命令如何在命令行中实际运行，并以不同的方式编译文件来试验它。

例如，我使用cobra.go编译了这个名为go build cobra.go的文件，现在我有一个可执行文件cobra。

如果我./name，它的行为与./name help的行为相同并打印：

Usage:
  app [command]

Available Commands:
  print [string to print]   Print anything to the screen
  echo [string to echo]     Echo anything to the screen
  help [command]            Help about any command

 Available Flags:
      --help=false: help for app

Use "app help [command]" for more information about that command.

然而，描述错误地说要使用它，你必须做“app help [command]”。

如果我这样做./app help print（当然只有眼镜蛇可执行文件），它会打印出来：

zsh: no such file or directory: ./app

如果我app help print它也不起作用（因为在PATH中找不到它）：

zsh: command not found: app

所以我的理解是，除非我使用与root相同的名称构建它，否则cobra会表现得很有趣。

所以这意味着使用字段必须匹配帮助输出的文件名才有意义，并且我们能够正确运行其子命令，对吗？

另外，如果只允许一个包main，那么如何在同一个项目中拥有（编译）多个不同的“root”命令？如果在main下有多个“root”命令，它应该不起作用，对吧？我很快就会尝试其中的一些想法。

Answer 1

您可以查看cobra的使用方式是其他项目（go-search）。

例如，bitballoon-cli项目定义了多个命令，每个命令都在自己的文件中，每个命令都在主包中。像create.go：

package main

import (
    "github.com/BitBalloon/bitballoon-go"
    "github.com/spf13/cobra"
    "log"
)

var createCmd = &cobra.Command{
    Use:   "create",
    Short: "create a new BitBalloon site",
    Long:  "creates a new BitBalloon site and returns an ID you can deploy to",
}

var siteName, customDomain, password, notificationEmail string

func init() {
    createCmd.Run = create

    createCmd.Flags().StringVarP(&siteName, "name", "n", "", "Name of the site (must be a valid subdomain: <name>.bitballoon.com)")
    createCmd.Flags().StringVarP(&customDomain, "domain", "d", "", "Custom domain for the site (only works for premium sites)")
    createCmd.Flags().StringVarP(&password, "password", "p", "", "Password for the site")
    createCmd.Flags().StringVarP(&notificationEmail, "email", "e", "", "Notification email for form submissions (only works for premium sites)")
}

func create(cmd *cobra.Command, args []string) {
  // your function for this command
}

您可以检查定义和向项目添加命令的方式是否适合您的情况。

4年后，请参阅视频＆＃34; justforfunc #32: CLI tools with Cobra＆＃34;， Francesc Campoy 。

眼镜蛇指挥官如何去（golang）工作？

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