breaking up the structure of this thing a bit

point.go

@@ -0,0 +1,3 @@
+package main
+
+type point struct { x, y int }

ui.go

@@ -1,9 +1,6 @@
 package main
 
 import (
-	"fmt"
-	"time"
-
 	"github.com/gdamore/tcell/v2"
 	"github.com/jordanorelli/belt-mud/internal/exit"
 	"github.com/jordanorelli/blammo"
@@ -13,6 +10,7 @@ import (
 type ui struct {
 	*blammo.Log
 	screen tcell.Screen
+	mode   uiMode
 }
 
 func (ui *ui) run() {
@@ -38,12 +36,10 @@ func (ui *ui) run() {
 		screen.Fini()
 	}()
 
+	ui.mode = &boxWalker{}
 	ui.menu()
 	ui.Debug("clearing screen")
 	screen.Clear()
-
-	time.Sleep(1 * time.Second)
-
 }
 
 // writeString writes a string in the given style from left to right beginning
@@ -69,70 +65,24 @@ func (ui *ui) menu() {
 	ui.writeString(0, height-1, "fart", tcell.StyleDefault)
 	ui.screen.Sync()
 
-	type point struct{ x, y int }
-	position := point{10, 10}
-
-	redraw := func() {
-		if position.x < 2 {
-			position.x = 2
-		}
-		if position.x > 11 {
-			position.x = 11
-		}
-		if position.y < 2 {
-			position.y = 2
-		}
-		if position.y > 10 {
-			position.y = 10
-		}
-		ui.screen.Clear()
-		ui.writeString(1, 1, `┌──────────┐`, tcell.StyleDefault)
-		ui.writeString(1, 2, `│··········│`, tcell.StyleDefault)
-		ui.writeString(1, 3, `│··········│`, tcell.StyleDefault)
-		ui.writeString(1, 4, `│··········│`, tcell.StyleDefault)
-		ui.writeString(1, 5, `│··········│`, tcell.StyleDefault)
-		ui.writeString(1, 6, `│··········│`, tcell.StyleDefault)
-		ui.writeString(1, 7, `│··········│`, tcell.StyleDefault)
-		ui.writeString(1, 8, `│··········│`, tcell.StyleDefault)
-		ui.writeString(1, 9, `│··········│`, tcell.StyleDefault)
-		ui.writeString(1, 10, `│··········│`, tcell.StyleDefault)
-		ui.writeString(1, 11, `└──────────┘`, tcell.StyleDefault)
-		ui.screen.SetContent(position.x, position.y, '+', nil, tcell.StyleDefault)
-		ui.writeString(0, 12, fmt.Sprintf(" (%02d, %02d)", position.x, position.y), tcell.StyleDefault)
-		ui.screen.Show()
-	}
-	redraw()
-
 	for {
 		e := ui.screen.PollEvent()
 		if e == nil {
 			break
 		}
+
 		switch v := e.(type) {
 		case *tcell.EventKey:
-			ui.Debug("screen saw key event: %v", v.Key())
 			key := v.Key()
 			if key == tcell.KeyCtrlC {
 				return
 			}
-			if key == tcell.KeyRune {
-				switch v.Rune() {
-				case 'w':
-					position.y--
-					redraw()
-				case 'a':
-					position.x--
-					redraw()
-				case 's':
-					position.y++
-					redraw()
-				case 'd':
-					position.x++
-					redraw()
-				}
-			}
-		default:
-			ui.Debug("screen saw unhandled event of type %T", e)
 		}
+
+		ui.mode.HandleEvent(e)
+
+		ui.screen.Clear()
+		ui.mode.draw(ui)
+		ui.screen.Show()
 	}
 }

ui_menu.go

@@ -0,0 +1,5 @@
+package main
+
+type uiMenu struct {
+	title string
+}

ui_mode.go

@@ -1,4 +1,68 @@
 package main
 
+import (
+	"fmt"
+
+	"github.com/gdamore/tcell/v2"
+)
+
 type uiMode interface {
+	HandleEvent(tcell.Event) bool
+	draw(*ui)
+}
+
+type boxWalker struct {
+	width    int
+	height   int
+	position point
+}
+
+func (m *boxWalker) HandleEvent(e tcell.Event) bool {
+	switch v := e.(type) {
+	case *tcell.EventKey:
+		key := v.Key()
+		if key == tcell.KeyRune {
+			switch v.Rune() {
+			case 'w':
+				m.position.y--
+			case 'a':
+				m.position.x--
+			case 's':
+				m.position.y++
+			case 'd':
+				m.position.x++
+			}
+		}
+	default:
+		// ui.Debug("screen saw unhandled event of type %T", e)
+	}
+	return true
+}
+
+func (m *boxWalker) draw(ui *ui) {
+	if m.position.x < 2 {
+		m.position.x = 2
+	}
+	if m.position.x > 11 {
+		m.position.x = 11
+	}
+	if m.position.y < 2 {
+		m.position.y = 2
+	}
+	if m.position.y > 10 {
+		m.position.y = 10
+	}
+	ui.writeString(1, 1, `┌──────────┐`, tcell.StyleDefault)
+	ui.writeString(1, 2, `│··········│`, tcell.StyleDefault)
+	ui.writeString(1, 3, `│··········│`, tcell.StyleDefault)
+	ui.writeString(1, 4, `│··········│`, tcell.StyleDefault)
+	ui.writeString(1, 5, `│··········│`, tcell.StyleDefault)
+	ui.writeString(1, 6, `│··········│`, tcell.StyleDefault)
+	ui.writeString(1, 7, `│··········│`, tcell.StyleDefault)
+	ui.writeString(1, 8, `│··········│`, tcell.StyleDefault)
+	ui.writeString(1, 9, `│··········│`, tcell.StyleDefault)
+	ui.writeString(1, 10, `│··········│`, tcell.StyleDefault)
+	ui.writeString(1, 11, `└──────────┘`, tcell.StyleDefault)
+	ui.screen.SetContent(m.position.x, m.position.y, '@', nil, tcell.StyleDefault)
+	ui.writeString(0, 12, fmt.Sprintf(" (%02d, %02d)", m.position.x, m.position.y), tcell.StyleDefault)
 }