main.go

package main

import (
	"flag"
	"log"
	"os"
	"path/filepath"
	"regexp"
	"strconv"
	"time"

	"github.com/simulatedsimian/joystick"
)

func main() {
	log.SetFlags(log.LstdFlags | log.Lshortfile)
	versionRegex := regexp.MustCompile("[0-9]+$")
	buttonId := flag.Int("button", 0, "action button")
	flag.Parse()
	devices, err := filepath.Glob("/dev/input/js*")
	if err != nil {
		log.Fatal(err)
	}
	var joysticks []joystick.Joystick
	for _, v := range devices {
		n, err := strconv.Atoi(versionRegex.FindString(v))
		if err != nil {
			log.Fatal(err)
		}
		js, err := joystick.Open(n)
		if err != nil {
			log.Fatal(err)
		}
		joysticks = append(joysticks, js)
		defer js.Close()
	}

	var initialRelease bool

read:
	for range time.NewTicker(10 * time.Millisecond).C {
		for _, js := range joysticks {
			state, err := js.Read()
			if err != nil {
				continue
			}
			for button := 0; button < js.ButtonCount(); button++ {
				pressed := state.Buttons&(1<<uint32(button)) != 0
				if button == *buttonId && pressed {
					if initialRelease {
						os.Exit(0)
					}
					continue read
				}
			}
		}
		initialRelease = true
	}
}