ui: add cursor

ui/ui.go

@@ -8,7 +8,6 @@ import (
 )
 
 type Ui struct {
-	gui      *gocui.Gui
 	channels *views.Channels
 }
 
@@ -19,16 +18,16 @@ func (u *Ui) Run() error {
 	}
 	defer g.Close()
 
-	u.gui = g
-
 	g.Cursor = true
 	g.SetManagerFunc(u.layout)
 
-	err = g.SetKeybinding("", gocui.KeyCtrlC, gocui.ModNone, quit)
+	err = u.setKeyBinding(g)
 	if err != nil {
 		return err
 	}
 
+	g.Update(u.channels.Refresh)
+
 	err = g.MainLoop()
 	if err != nil && err != gocui.ErrQuit {
 		return err
@@ -37,6 +36,51 @@ func (u *Ui) Run() error {
 	return err
 }
 
+func (u *Ui) setKeyBinding(g *gocui.Gui) error {
+	err := g.SetKeybinding("", gocui.KeyCtrlC, gocui.ModNone, quit)
+	if err != nil {
+		return err
+	}
+
+	err = g.SetKeybinding("", gocui.KeyArrowUp, gocui.ModNone, cursorUp)
+	if err != nil {
+		return err
+	}
+
+	err = g.SetKeybinding("", gocui.KeyArrowDown, gocui.ModNone, cursorDown)
+	if err != nil {
+		return err
+	}
+
+	return nil
+}
+
+func cursorDown(g *gocui.Gui, v *gocui.View) error {
+	if v != nil {
+		cx, cy := v.Cursor()
+		if err := v.SetCursor(cx, cy+1); err != nil {
+			ox, oy := v.Origin()
+			if err := v.SetOrigin(ox, oy+1); err != nil {
+				return err
+			}
+		}
+	}
+	return nil
+}
+
+func cursorUp(g *gocui.Gui, v *gocui.View) error {
+	if v != nil {
+		ox, oy := v.Origin()
+		cx, cy := v.Cursor()
+		if err := v.SetCursor(cx, cy-1); err != nil && oy > 0 {
+			if err := v.SetOrigin(ox, oy-1); err != nil {
+				return err
+			}
+		}
+	}
+	return nil
+}
+
 func (u *Ui) layout(g *gocui.Gui) error {
 	maxX, maxY := g.Size()
 	return u.channels.Set(g, 0, maxY/8, maxX-1, maxY-1)

ui/views/channels.go

@@ -40,16 +40,16 @@ func (c *Channels) Set(g *gocui.Gui, x0, y0, x1, y1 int) error {
 		if err != gocui.ErrUnknownView {
 			return err
 		}
+		_, err = g.SetCurrentView(CHANNELS)
+		if err != nil {
+			return err
+		}
 	}
 	c.View.Frame = false
 	c.View.Autoscroll = true
 	c.View.SelBgColor = gocui.ColorCyan
 	c.View.SelFgColor = gocui.ColorBlack
-
-	err = c.update(context.Background())
-	if err != nil {
-		return err
-	}
+	c.Highlight = true
 
 	c.display()
 	return nil
@@ -92,6 +92,7 @@ func (c *Channels) update(ctx context.Context) error {
 }
 
 func (c *Channels) display() {
+	c.Clear()
 	for _, item := range c.items {
 		line := fmt.Sprintf("%s  %s  %12d  %s  %s",
 			active(item),