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Hello world for Nintendo Game Boy

=== About ===
This is the source code for a simple "Hello World" for the Nintendo Game Boy 
(1989). This is here as a refrence to see how asm works for the Game Boy.

=== Compile ===
In order to compile, you will need RGBDS[0] installed. Then run the following 
commands:


rgbasm -o main.o main.asm

rgblink -o hello-world.gb main.o

rgbfix -v -p 0 hello-world.gb


You should now have a Game Boy ROM that will run in any emulator or even the 
real hardware is using a flashcart!

=== Links ===
[0]: https://rgbds.gbdev.io/
9-01-13 14:26:46 -0500 Add directory list widget' href='/akspecs/aerc/commit/widgets/directories.go?h=0.5.2&id=2349b7de869e5abc16a419a073273af99b62aad2'>2349b7d ^
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package widgets

import (
	"log"
	"sort"

	"github.com/gdamore/tcell"

	"git.sr.ht/~sircmpwn/aerc2/config"
	"git.sr.ht/~sircmpwn/aerc2/lib/ui"
	"git.sr.ht/~sircmpwn/aerc2/worker/types"
)

type DirectoryList struct {
	conf         *config.AccountConfig
	dirs         []string
	logger       *log.Logger
	onInvalidate func(d ui.Drawable)
	selected     string
	worker       *types.Worker
}

func NewDirectoryList(conf *config.AccountConfig,
	logger *log.Logger, worker *types.Worker) *DirectoryList {

	return &DirectoryList{conf: conf, logger: logger, worker: worker}
}

func (dirlist *DirectoryList) UpdateList(done func(dirs []string)) {
	var dirs []string
	dirlist.worker.PostAction(
		&types.ListDirectories{}, func(msg types.WorkerMessage) {

			switch msg := msg.(type) {
			case *types.Directory:
				dirs = append(dirs, msg.Name)
			case *types.Done:
				sort.Strings(dirs)
				dirlist.dirs = dirs
				dirlist.Invalidate()
				if done != nil {
					done(dirs)
				}
			}
		})
}

func (dirlist *DirectoryList) Select(name string) {
	dirlist.selected = name
	dirlist.Invalidate()
}

func (dirlist *DirectoryList) OnInvalidate(onInvalidate func(d ui.Drawable)) {
	dirlist.onInvalidate = onInvalidate
}

func (dirlist *DirectoryList) Invalidate() {
	if dirlist.onInvalidate != nil {
		dirlist.onInvalidate(dirlist)
	}
}

func (dirlist *DirectoryList) Draw(ctx *ui.Context) {
	ctx.Fill(0, 0, ctx.Width(), ctx.Height(), ' ', tcell.StyleDefault)
	row := 0
	for _, name := range dirlist.dirs {
		if row >= ctx.Height() {
			break
		}
		if len(dirlist.conf.Folders) > 1 && name != dirlist.selected {
			idx := sort.SearchStrings(dirlist.conf.Folders, name)
			if idx == len(dirlist.conf.Folders) ||
				dirlist.conf.Folders[idx] != name {
				continue
			}
		}
		style := tcell.StyleDefault
		if name == dirlist.selected {
			style = style.Background(tcell.ColorWhite).
				Foreground(tcell.ColorBlack)
		}
		ctx.Fill(0, row, ctx.Width(), 1, ' ', style)
		ctx.Printf(0, row, style, "%s", name)
		row++
	}
}