Buffer, DamageBuffer, and Application are io.Writers

backends/pixel/pixel.go

@@ -19,6 +19,7 @@ type Backend struct {
 	backgroundStamper *imdraw.IMDraw
 	fontAtlas         *text.Atlas
 	textDrawer        *text.Text
+	showBounds        bool
 
 	metrics struct {
 		cellWidth  int
@@ -176,15 +177,18 @@ func (backend *Backend) draw () {
 			backend.textDrawer.Draw(backend.window, pixel.IM)
 		}
 	}
-	
+
-	backend.backgroundStamper.Clear()
+	// draw a rectangle around the buffer if we are showing bounds
-	backend.backgroundStamper.Color =
+	if backend.showBounds {
-		backend.config.Color(stone.ColorBackground)
+		backend.backgroundStamper.Clear()
-	backend.backgroundStamper.Push (
+		backend.backgroundStamper.Color =
-		backend.vectorAtPosition(0, 0),
+			backend.config.Color(stone.ColorBackground)
-		backend.vectorAtPosition(width, height))
+		backend.backgroundStamper.Push (
-	backend.backgroundStamper.Rectangle(1)
+			backend.vectorAtPosition(0, 0),
-	backend.backgroundStamper.Draw(backend.window)
+			backend.vectorAtPosition(width, height))
+		backend.backgroundStamper.Rectangle(1)
+		backend.backgroundStamper.Draw(backend.window)
+	}
 
 	backend.window.SwapBuffers()
 }

buffer.go

@@ -43,6 +43,10 @@ type Buffer struct {
 	content []Cell
 	width  int
 	height int
+	Dot struct {
+		X int
+		Y int
+	}
 }
 
 func (buffer *Buffer) Size () (width, height int) {
@@ -74,6 +78,27 @@ func (buffer *Buffer) SetRune (x, y int, content rune) {
 	buffer.content[x + y * buffer.width].content = content
 }
 
+func (buffer *Buffer) Write (bytes []byte) (bytesWritten int, err error) {
+	text := string(bytes)
+	bytesWritten = len(bytes)
+	
+	for _, character := range text {
+		buffer.SetRune(buffer.Dot.X, buffer.Dot.Y, character)
+		buffer.Dot.X ++
+		if buffer.Dot.X > buffer.width {
+			buffer.Dot.X = 0
+			buffer.Dot.Y --
+		}
+	}
+	
+	return
+}
+
+func (buffer *Buffer) ResetDot () {
+	buffer.Dot.X = 0
+	buffer.Dot.Y = 0
+}
+
 type DamageBuffer struct {
 	Buffer
 	clean []bool