tcell/tviewでTUIを作るならキー割り当てにcbindを利用しよう

	ev := screen.PollEvent()
    switch ev := ev.(type) {
        case *tcell.EventKey:
		    switch ev.Key() {
			case tcell.KeyEscape:
				close(quit)
				return
            }
            case tcell.KeyEnter:
                action()
                return
    }

const (
    // アクション名
	actionQuit = "quit"
)

var keyBind = map[string][]string{
    // アクション名に対してキー文字列をマッピング（キー文字列は複数可能）
	actionQuit: {"q", "ctrl+q"},
}

var actionHandlers = map[string]func(){
    // アクション名に対してイベントハンドラをマッピング
	actionQuit: handleQuit,
}

// 終了のイベントハンドラ
var quit = make(chan struct{})
var handleQuit = func() {
	close(quit)
}

func setKeyBind() (*cbind.Configuration, error) {
	c := cbind.NewConfiguration()

	for a, keys := range keyBind {
        // キーバインドのアクション名からイベントハンドラに変換
		handler := actionHandlers[a]
		if handler == nil {
			return nil, fmt.Errorf("[%s] unknown action", a)
		}
		for _, key := range keys {
			if err := c.Set(key, wrapEventHandler(handler)); err != nil {
				return nil, fmt.Errorf("failed to set keybind: %s", err)
			}
		}
	}
	return c, nil
}

// func(*tcell.EventKey) *tcell.EventKey という形式のため、
// 引数、返り値を無しの関数を登録するためのラップ関数
func wrapEventHandler(f func()) func(_ *tcell.EventKey) *tcell.EventKey {
	return func(_ *tcell.EventKey) *tcell.EventKey {
		f()
		return nil
	}
}

	ev := screen.PollEvent()
    switch ev := ev.(type) {
        case *tcell.EventKey:
            c.Capture(ev)
    }

package main

import (
	"fmt"
	"log"
	"strings"

	"code.rocketnine.space/tslocum/cbind"
	"github.com/gdamore/tcell/v2"
	"github.com/mattn/go-runewidth"
)

const (
	actionQuit = "quit"
)

var keyBind = map[string][]string{
	actionQuit: {"q", "ctrl+q"},
}

var actionHandlers = map[string]func(){
	actionQuit: handleQuit,
}

var quit = make(chan struct{})
var handleQuit = func() {
	close(quit)
}

func setKeyBind() (*cbind.Configuration, error) {
	c := cbind.NewConfiguration()

	for a, keys := range keyBind {
		handler := actionHandlers[a]
		if handler == nil {
			return nil, fmt.Errorf("[%s] unknown action", a)
		}
		for _, key := range keys {
			if err := c.Set(key, wrapEventHandler(handler)); err != nil {
				return nil, fmt.Errorf("failed to set keybind: %s", err)
			}
		}
	}
	return c, nil
}

func wrapEventHandler(f func()) func(_ *tcell.EventKey) *tcell.EventKey {
	return func(_ *tcell.EventKey) *tcell.EventKey {
		f()
		return nil
	}
}

func main() {
	screen, err := tcell.NewScreen()
	if err != nil {
		log.Fatal(err)
	}
	if err = screen.Init(); err != nil {
		log.Fatal(err)
	}
	defer screen.Fini()

	c, err := setKeyBind()
	if err != nil {
		log.Fatal(err)
	}

	// Start application.
	str := fmt.Sprintf("[%s] %s", strings.Join(keyBind[actionQuit], ","), actionQuit)
	setContents(screen, 0, 0, str, tcell.StyleDefault)
	screen.Show()

	// Main routine.
	go func() {
		for {
			ev := screen.PollEvent()
			switch ev := ev.(type) {
			case *tcell.EventKey:
				c.Capture(ev)
			}
		}
	}()
	<-quit
}

func setContents(screen tcell.Screen, x int, y int, str string, style tcell.Style) {
	for _, r := range str {
		screen.SetContent(x, y, r, nil, style)
		x += runewidth.RuneWidth(r)
	}
}