Golang使用github.com/spf13/cobra处理命令行参数

这是一个最最基本的用法：

package main

import (
    "fmt"
    "os"

    "github.com/spf13/cobra"
)

const ProgramName = "testcmd"

var (
    address     string
    tlsEnabled  bool
)

func Cmd(programName string) *cobra.Command {
    var cmd = &cobra.Command{
        Use:   programName,
        Short: fmt.Sprintf("Sample %s program", programName),
        Long:  fmt.Sprintf("Long name of sample %s program", programName),
        RunE: func(cmd *cobra.Command, args []string) error {
            fmt.Printf("Welcome to %s world with address=[%s], tls=[%t]\n", programName, address, tlsEnabled)
            if len(args) > 0 {
                return fmt.Errorf("unexpected args are met: %v", args)
            }
            return nil
        },
    }

    cmd.Flags().StringVarP(&address,  "address", "d", "",    "Target address")
    cmd.Flags().BoolVarP(&tlsEnabled, "tls",     "",  false, "Whethere TLS is enabled")

    return cmd
}

func main() {
    cmd := Cmd(ProgramName)
    if cmd.Execute() != nil {
        os.Exit(1)
    }
}

对比golang原始的flag模块，这个格式处理的更加简洁。