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package main

import (
	"errors"
	"fmt"
	"os"
)

var ErrEZ = errors.New("can't combine -e and -z options")

func usage() {
	fmt.Print("Usage:")
	fmt.Println("\tsignify -C [-q] -p pubkey -x sigfile [file ...]")
	fmt.Println("\tsignify -G [-n] [-c comment] -p pubkey -s seckey")
	fmt.Println("\tsignify -S [-ez] [-x sigfile] -s seckey -m message")
	fmt.Println("\tsignify -V [-eqz] [-p pubkey] [-t keytype] [-x sigfile] -m message")
	os.Exit(2)
}

func fatal(err error) {
	fmt.Println(err)
	os.Exit(1)
}

func main() {
	if len(os.Args) < 2 {
		usage()
	}
	switch os.Args[1] {
	case "-C", "check":
		if err := check(); err != nil {
			fatal(err)
		}
	case "-G", "generate":
		if err := generate(); err != nil {
			fatal(err)
		}
	case "-S", "sign":
		if err := sign(); err != nil {
			fatal(err)
		}
	case "-V", "verify":
		if err := verify(); err != nil {
			fatal(err)
		}
	default:
		usage()
	}
}