1 files changed, 156 insertions, 0 deletions
diff --git a/widgets/dirlist.go b/widgets/dirlist.go
new file mode 100644
index 0000000..d66ae1f
--- /dev/null
+++ b/widgets/dirlist.go
@@ -0,0 +1,156 @@
+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)
+	selecting    string
+	selected     string
+	spinner      *Spinner
+	worker       *types.Worker
+}
+
+func NewDirectoryList(conf *config.AccountConfig,
+	logger *log.Logger, worker *types.Worker) *DirectoryList {
+
+	dirlist := &DirectoryList{
+		conf:    conf,
+		logger:  logger,
+		spinner: NewSpinner(),
+		worker:  worker,
+	}
+	dirlist.spinner.OnInvalidate(func(_ ui.Drawable) {
+		dirlist.Invalidate()
+	})
+	dirlist.spinner.Start()
+	return dirlist
+}
+
+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.spinner.Stop()
+				dirlist.Invalidate()
+				if done != nil {
+					done(dirs)
+				}
+			}
+		})
+}
+
+func (dirlist *DirectoryList) Select(name string) {
+	dirlist.selecting = name
+	dirlist.worker.PostAction(&types.OpenDirectory{Directory: name},
+		func(msg types.WorkerMessage) {
+			switch msg.(type) {
+			case *types.Error:
+				dirlist.selecting = ""
+			default:
+				dirlist.selected = dirlist.selecting
+			}
+			dirlist.Invalidate()
+		})
+	dirlist.Invalidate()
+}
+
+func (dirlist *DirectoryList) Selected() string {
+	return dirlist.selected
+}
+
+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)
+
+	if dirlist.spinner.IsRunning() {
+		dirlist.spinner.Draw(ctx)
+		return
+	}
+
+	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++
+	}
+}
+
+func (dirlist *DirectoryList) nextPrev(delta int) {
+	for i, dir := range dirlist.dirs {
+		if dir == dirlist.selected {
+			var j int
+			ndirs := len(dirlist.dirs)
+			for j = i + delta; j != i; j += delta {
+				if j < 0 {
+					j = ndirs - 1
+				}
+				if j >= ndirs {
+					j = 0
+				}
+				name := dirlist.dirs[j]
+				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
+					}
+				}
+				break
+			}
+			dirlist.Select(dirlist.dirs[j])
+			break
+		}
+	}
+}
+
+func (dirlist *DirectoryList) Next() {
+	dirlist.nextPrev(1)
+}
+
+func (dirlist *DirectoryList) Prev() {
+	dirlist.nextPrev(-1)
+}