Add statusline

buffer.go

@@ -42,6 +42,7 @@ func (b *Buffer) save() error {
 }
 
 func (b *Buffer) saveAs(filename string) error {
+	b.savedText = b.text
 	err := ioutil.WriteFile(filename, []byte(b.text), 0644)
 	return err
 }

cursor.go

@@ -95,6 +95,10 @@ func (c *Cursor) getCharPos(lineNum, visualPos int) int {
 	return visualPos - (tabSize-1)*numTabs
 }
 
+func (c *Cursor) getVisualX() int {
+	return c.x + numOccurences(c.v.buf.lines[c.y][:c.x], '\t')*(tabSize-1)
+}
+
 func (c *Cursor) distance(x, y int) int {
 	// Same line
 	if y == c.y {
@@ -138,7 +142,7 @@ func (c *Cursor) distance(x, y int) int {
 }
 
 func (c *Cursor) display() {
-	if c.y-c.v.topline < 0 || c.y-c.v.topline > c.v.linesN-1 {
+	if c.y-c.v.topline < 0 || c.y-c.v.topline > c.v.height-1 {
 		c.v.s.HideCursor()
 	} else {
 		voffset := numOccurences(c.v.buf.lines[c.y][:c.x], '\t') * (tabSize - 1)

micro.go

@@ -19,12 +19,14 @@ func main() {
 
 	if len(os.Args) > 1 {
 		filename = os.Args[1]
-		var err error
-		input, err = ioutil.ReadFile(filename)
+		if _, err := os.Stat(filename); err == nil {
+			var err error
+			input, err = ioutil.ReadFile(filename)
 
-		if err != nil {
-			fmt.Println(err)
-			os.Exit(1)
+			if err != nil {
+				fmt.Println(err)
+				os.Exit(1)
+			}
 		}
 	} else if !isatty.IsTerminal(os.Stdin.Fd()) {
 		bytes, err := ioutil.ReadAll(os.Stdin)
@@ -44,9 +46,15 @@ func main() {
 		fmt.Fprintf(os.Stderr, "%v\n", e)
 		os.Exit(1)
 	}
+
+	defStyle := tcell.StyleDefault.
+		Background(tcell.ColorDefault).
+		Foreground(tcell.ColorDefault)
+
+	s.SetStyle(defStyle)
 	s.EnableMouse()
 
-	v := newViewFromBuffer(newBuffer(string(input), filename), s)
+	v := newView(newBuffer(string(input), filename), s)
 
 	// Initially everything needs to be drawn
 	redraw := 2
@@ -55,9 +63,11 @@ func main() {
 			s.Clear()
 			v.display()
 			v.cursor.display()
+			v.sl.display()
 			s.Show()
 		} else if redraw == 1 {
 			v.cursor.display()
+			v.sl.display()
 			s.Show()
 		}
 

statusline.go

@@ -0,0 +1,33 @@
+package main
+
+import (
+	"github.com/gdamore/tcell"
+	"strconv"
+)
+
+type Statusline struct {
+	v *View
+}
+
+func (sl *Statusline) display() {
+	y := sl.v.height
+
+	file := sl.v.buf.name
+	if file == "" {
+		file = "Untitled"
+	}
+	if sl.v.buf.text != sl.v.buf.savedText {
+		file += " +"
+	}
+	file += " (" + strconv.Itoa(sl.v.cursor.y+1) + "," + strconv.Itoa(sl.v.cursor.getVisualX()+1) + ")"
+
+	statusLineStyle := tcell.StyleDefault.Background(tcell.ColorNavy).Foreground(tcell.ColorBlack)
+
+	for x := 0; x < sl.v.width; x++ {
+		if x < count(file) {
+			sl.v.s.SetContent(x, y, []rune(file)[x], nil, statusLineStyle)
+		} else {
+			sl.v.s.SetContent(x, y, ' ', nil, statusLineStyle)
+		}
+	}
+}

view.go

@@ -8,25 +8,31 @@ import (
 type View struct {
 	cursor  Cursor
 	topline int
-	linesN  int
-	colsN   int
+	height  int
+	width   int
+
+	buf *Buffer
+	sl  Statusline
 
-	buf           *Buffer
 	mouseReleased bool
 
 	s tcell.Screen
 }
 
-func newViewFromBuffer(buf *Buffer, s tcell.Screen) *View {
+func newView(buf *Buffer, s tcell.Screen) *View {
+	w, h := s.Size()
+	return newViewWidthHeight(buf, s, w, h)
+}
+
+func newViewWidthHeight(buf *Buffer, s tcell.Screen, w, h int) *View {
 	v := new(View)
 
 	v.buf = buf
 	v.s = s
-	w, h := s.Size()
 
 	v.topline = 0
-	v.linesN = h
-	v.colsN = w
+	v.height = h - 2
+	v.width = w
 	v.cursor = Cursor{
 		x:   0,
 		y:   0,
@@ -34,12 +40,16 @@ func newViewFromBuffer(buf *Buffer, s tcell.Screen) *View {
 		v:   v,
 	}
 
+	v.sl = Statusline{
+		v: v,
+	}
+
 	return v
 }
 
 // Returns an int describing how the screen needs to be redrawn
 // 0: Screen does not need to be redrawn
-// 1: Only the cursor needs to be redrawn
+// 1: Only the cursor/statusline needs to be redrawn
 // 2: Everything needs to be redrawn
 func (v *View) handleEvent(event tcell.Event) int {
 	var ret int
@@ -62,6 +72,10 @@ func (v *View) handleEvent(event tcell.Event) int {
 			v.buf.insert(v.cursor.loc, "\n")
 			v.cursor.right()
 			ret = 2
+		case tcell.KeySpace:
+			v.buf.insert(v.cursor.loc, " ")
+			v.cursor.right()
+			ret = 2
 		case tcell.KeyBackspace2:
 			if v.cursor.loc > 0 {
 				v.cursor.left()
@@ -72,6 +86,13 @@ func (v *View) handleEvent(event tcell.Event) int {
 			v.buf.insert(v.cursor.loc, "\t")
 			v.cursor.right()
 			ret = 2
+		case tcell.KeyCtrlS:
+			err := v.buf.save()
+			if err != nil {
+				// Error!
+			}
+			// Need to redraw the status line
+			ret = 1
 		case tcell.KeyRune:
 			v.buf.insert(v.cursor.loc, string(e.Rune()))
 			v.cursor.right()
@@ -88,8 +109,8 @@ func (v *View) handleEvent(event tcell.Event) int {
 
 		switch button {
 		case tcell.Button1:
-			if y-v.topline > v.linesN-1 {
-				y = v.linesN + v.topline - 1
+			if y-v.topline > v.height-1 {
+				y = v.height + v.topline - 1
 			}
 			if y > len(v.buf.lines) {
 				y = len(v.buf.lines) - 1
@@ -120,7 +141,7 @@ func (v *View) handleEvent(event tcell.Event) int {
 				return 0
 			}
 		case tcell.WheelDown:
-			if v.topline < len(v.buf.lines)-v.linesN {
+			if v.topline < len(v.buf.lines)-v.height {
 				v.topline++
 				return 2
 			} else {
@@ -134,8 +155,8 @@ func (v *View) handleEvent(event tcell.Event) int {
 		v.topline = cy
 		ret = 2
 	}
-	if cy > v.topline+v.linesN-1 {
-		v.topline = cy - v.linesN + 1
+	if cy > v.topline+v.height-1 {
+		v.topline = cy - v.height + 1
 		ret = 2
 	}
 
@@ -143,9 +164,8 @@ func (v *View) handleEvent(event tcell.Event) int {
 }
 
 func (v *View) display() {
-
 	var charNum int
-	for lineN := 0; lineN < v.linesN; lineN++ {
+	for lineN := 0; lineN < v.height; lineN++ {
 		if lineN+v.topline >= len(v.buf.lines) {
 			break
 		}