library/cmd/manage/main.go

package main

import (
	"fmt"
	"log"

	"git.yetaga.in/alazyreader/library/config"
	"github.com/gdamore/tcell"
	"github.com/kelseyhightower/envconfig"
)

func main() {
	var c config.Config
	err := envconfig.Process("library", &c)
	if err != nil {
		log.Fatalln(err)
	}
	screen, err := tcell.NewScreen()
	if err != nil {
		log.Fatalln(err)
	}
	err = screen.Init()
	if err != nil {
		log.Fatalln(err)
	}

	l := NewList([]string{"foo", "bar", "baz"}, 0)
	b := NewBox(
		"library",
		[]string{"(e)dit", "(q)uit"},
		contents{{
			offsets:   offsets{top: 1, left: 2, bottom: -2, right: -2},
			container: l,
		}},
	)

	// init
	screen.Clear()
	w, h := screen.Size()
	b.SetSize(0, 0, h, w)
	b.Draw(screen)
	screen.Sync()

	// UI loop
	for {
		e := screen.PollEvent()
		switch v := e.(type) {
		case *tcell.EventError:
			screen.Beep()
		case *tcell.EventKey: // input handling
			if v.Key() == tcell.KeyUp && l.selected > 0 {
				l.selected = l.selected - 1
			}
			if v.Key() == tcell.KeyDown && l.selected < len(l.listItems)-1 {
				l.selected = l.selected + 1
			}
			if v.Rune() == 'q' {
				screen.Fini()
				fmt.Printf("Thank you for playing Wing Commander!\n\n")
				return
			}
			screen.Clear()
			b.Draw(screen)
		case *tcell.EventResize: // screen redraw
			w, h := screen.Size()
			b.SetSize(0, 0, h, w)
			screen.Clear()
			b.Draw(screen)
		case *tcell.EventInterrupt:
		case *tcell.EventMouse:
		case *tcell.EventTime:
		default:
		}
		screen.Sync() // repaint
	}
}