library/cmd/manage/main.go

package main

import (
	"fmt"
	"log"

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

const (
	IN_MENU = iota
	IN_BOOK
)

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 := ui.NewList([]string{"foo", "bar", "baz"}, 0)
	menu := ui.NewBox(
		"library",
		[]string{"(q)uit"},
		ui.Contents{{
			Offsets:   ui.Offsets{Top: 1, Left: 2, Bottom: -2, Right: -2},
			Container: l,
		}},
	)
	book := ui.NewBookDetails()
	activeBook := ui.NewBox(
		"book",
		[]string{"test"},
		ui.Contents{{
			Offsets:   ui.Offsets{Top: 1, Left: 2, Bottom: -2, Right: -2},
			Container: book,
		}},
	)

	container := ui.NewContainer(
		ui.Contents{
			{Container: menu, Offsets: ui.Offsets{Percent: 1}},
			{Container: activeBook, Offsets: ui.Offsets{Percent: 2}},
		},
		ui.LayoutHorizontalPercent,
	)

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

	state := IN_MENU

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