subcommand.go

package main

import (
  "fmt"
  "flag"
  "os"
)

var usage =
`Usage argtest [Globals] <Command> [Options]

Commands:
  put Put something
  get Get something

Globals:
  -opt1=default-value First string option
  -opt2=default-value Second string option
`

func main() {
  var (
    opt1 = flag.String("opt1", "default-value", "First string option")
    opt2 = flag.String("opt2", "default-value", "Second string option")
  )

  flag.Usage = func() { fmt.Print(usage) }
  flag.Parse()
  fmt.Println("opt1:", *opt1)
  fmt.Println("opt2:", *opt2)
  args := flag.Args()
  if len(args) == 0 {
    flag.Usage()
    os.Exit(1)
  }           
  switch args[0] {
  case "put": 
    PutCommand(args[1:])
  case "get": 
    GetCommand(args[1:])
  default:
    flag.Usage()
    os.Exit(1)
  }
}
func PutCommand(args []string){
  fs := flag.NewFlagSet("put", flag.ExitOnError)
  putOpt := fs.String("put-opt", "default-value", "Put option")
  fs.Parse(args)

  fmt.Println("args:", fs.Args())
  fmt.Println("putopt:", *putOpt)
}
func GetCommand(args []string){
  fs := flag.NewFlagSet("get", flag.ExitOnError)
  getOpt := fs.String("get-opt", "default-value", "Get option")
  fs.Parse(args)

  fmt.Println("args:", fs.Args())
  fmt.Println("getopt:", *getOpt)
}

グローバルオプションopt1と、サブコマンドput

./subcommand -opt1=XXX put -put-opt=YYY BBB CCC
opt1: XXX
opt2: default-value
args: [BBB CCC]
putopt: YYY