使用cobra和viper创建cli dome（命令行工具）

package main

import (
	"fmt"

	"github.com/spf13/cobra"
	"github.com/spf13/viper"
)

func main() {
	var rootCmd = &cobra.Command{
		Use:   "app",
		Short: "This is a simple CLI app",
		Run: func(cmd *cobra.Command, args []string) {
			fmt.Println("Server Address:", viper.GetString("server.address"))
			fmt.Println("Server Port:", viper.GetInt("server.port"))
		},
	}

	var versionCmd = &cobra.Command{
		Use:   "version",
		Short: "Print the version number of MyTool",
		Run: func(cmd *cobra.Command, args []string) {
			fmt.Println("MyTool v0.1.0")
		},
	}

	rootCmd.PersistentFlags().String("address", "", "Server address")
	rootCmd.PersistentFlags().Int("port", 8080, "Server port")

	viper.BindPFlag("server.address", rootCmd.PersistentFlags().Lookup("address"))
	viper.BindPFlag("server.port", rootCmd.PersistentFlags().Lookup("port"))

	viper.SetDefault("server.address", "127.0.0.1")
	viper.SetConfigName("config")
	viper.SetConfigType("yaml")
	viper.AddConfigPath(".")
	viper.ReadInConfig()

	rootCmd.AddCommand(versionCmd)
	rootCmd.Execute()

}