▾ appName/
    ▾ cmd/
        root.go
        yourCmd.go
      main.go

package main
// 这个 pathToYourApp 就是你应用程序的路径
import (
  "{pathToYourApp}/cmd"
)
func main() {
  cmd.Execute()
}

package cmd
import (
  "fmt"
  "os"
  "github.com/spf13/cobra"
  "github.com/spf13/viper"
)
var (
  // 使用的标志
  cfgFile     string
  userLicense string
  rootCmd = &cobra.Command{
    Use:   "cobra",
    Short: "A generator for Cobra based Applications",
    Long: `Cobra is a CLI library for Go that empowers applications.
This application is a tool to generate the needed files
to quickly create a Cobra application.`,
  }
)
// 用于执行root
func Execute() error {
  return rootCmd.Execute()
}
// 初始化配置
func init() {
  cobra.OnInitialize(initConfig)
  rootCmd.PersistentFlags().StringVar(&cfgFile, "config", "", "config file (default is $HOME/.cobra.yaml)")
  rootCmd.PersistentFlags().StringP("author", "a", "YOUR NAME", "author name for copyright attribution")
  rootCmd.PersistentFlags().StringVarP(&userLicense, "license", "l", "", "name of license for the project")
  rootCmd.PersistentFlags().Bool("viper", true, "use Viper for configuration")
  viper.BindPFlag("author", rootCmd.PersistentFlags().Lookup("author"))
  viper.BindPFlag("useViper", rootCmd.PersistentFlags().Lookup("viper"))
  viper.SetDefault("author", "NAME HERE <EMAIL ADDRESS>")
  viper.SetDefault("license", "apache")
//  rootCmd.AddCommand(addCmd)
//  rootCmd.AddCommand(initCmd)
}
func initConfig() {
  if cfgFile != "" {
    // 使用标签中的配置
    viper.SetConfigFile(cfgFile)
  } else {
    // 在主目录下寻找基础配置
    home, err := os.UserHomeDir()
    cobra.CheckErr(err)
    // 在主目录下找不到 ".cobra" 文件的情况
    viper.AddConfigPath(home)
    viper.SetConfigType("yaml")
    viper.SetConfigName(".cobra")
  }
  viper.AutomaticEnv()
  if err := viper.ReadInConfig(); err == nil {
    fmt.Println("Using config file:", viper.ConfigFileUsed())
  }
}

package cmd
import (
   "fmt"
   "github.com/spf13/cobra"
)
func init() {
   rootCmd.AddCommand(versionCmd)
}
var versionCmd = &cobra.Command{
   Use:   "version",
   Short: "Print the version number of Hugo",
   Long:  `All software has versions. This is Hugo's`,
    // 执行该命令时，会执行的函数
   Run: func(cmd *cobra.Command, args []string) {
      fmt.Println("this is test cobra example")
   },
}

# 初始化go.mod文件
go mod init
# 整理依赖
go mod vendor

go build main.go

# 先查看总的命令
> main
# 然后查看version命令
> main version

package cmd
import (
   "github.com/gin-gonic/gin"
   "github.com/spf13/cobra"
)
func init() {
   rootCmd.AddCommand(serverCmd)
}
var serverCmd = &cobra.Command{
   Use:   "server",
   Short: "Print the version number of Hugo",
   Long:  `All software has versions. This is Hugo's`,
   Run: func(cmd *cobra.Command, args []string) {
      r := gin.Default()
      r.GET("/", func(context *gin.Context) {
         context.JSON(200,gin.H{
            "每一天":"都要开心",
         })
      })
      r.Run()
   },
}

go mod vendor

> go build main.go

> main server