combo/main.go

package main

import(
	"fmt"
	"os"
	"github.com/k1574/utf8tmpl/tmpl"
	"github.com/k1574/utf8tmpl/pin"
)

func main() {
	var(
		utilName string
		args []string
	)
	

	utilsMap := map[string]  interface{}  {
		"tmpl" : tmpl.Run,
		"pin" : pin.Run,
	}

	if len(os.Args)<2  {
		for k, _ := range utilsMap {
			fmt.Printf("%s\n", k)
		}
		os.Exit(0)
	} else {
		utilName = os.Args[1]
		args = os.Args[1:]
	}

	if _, ok := utilsMap[utilName] ; !ok {
		fmt.Printf("%s: %s: no such util\n", os.Args[0], utilName )
		os.Exit(1)
	}

	status := utilsMap[utilName].(func([]string) int )(args)

	os.Exit(status)
}