Simple support for gutter messages

cmd/micro/bindings.go

@@ -554,6 +554,7 @@ func (v *View) InsertTab() bool {
 
 // Save the buffer to disk
 func (v *View) Save() bool {
+	v.GutterMessage(4, "Hello", GutterInfo)
 	// If this is an empty buffer, ask for a filename
 	if v.buf.path == "" {
 		filename, canceled := messenger.Prompt("Filename: ")

cmd/micro/messenger.go

@@ -208,3 +208,15 @@ func (m *Messenger) Display() {
 		screen.Show()
 	}
 }
+
+const (
+	GutterInfo = iota
+	GutterWarning
+	GutterError
+)
+
+type GutterMessage struct {
+	lineNum int
+	msg     string
+	kind    int
+}

cmd/micro/view.go

@@ -34,6 +34,8 @@ type View struct {
 	// The eventhandler for undo/redo
 	eh *EventHandler
 
+	messages []GutterMessage
+
 	// The buffer
 	buf *Buffer
 	// The statusline
@@ -359,6 +361,20 @@ func (v *View) HandleEvent(event tcell.Event) {
 	}
 }
 
+func (v *View) GutterMessage(lineN int, msg string, kind int) {
+	gutterMsg := GutterMessage{
+		lineNum: lineN,
+		msg:     msg,
+		kind:    kind,
+	}
+	for _, gmsg := range v.messages {
+		if gmsg.lineNum == lineN {
+			return
+		}
+	}
+	v.messages = append(v.messages, gutterMsg)
+}
+
 // DisplayView renders the view to the screen
 func (v *View) DisplayView() {
 	// The character number of the character in the top left of the screen
@@ -375,6 +391,10 @@ func (v *View) DisplayView() {
 	}
 	var highlightStyle tcell.Style
 
+	if len(v.messages) > 0 {
+		v.lineNumOffset += 2
+	}
+
 	for lineN := 0; lineN < v.height; lineN++ {
 		var x int
 		// If the buffer is smaller than the view height
@@ -384,6 +404,31 @@ func (v *View) DisplayView() {
 		}
 		line := v.buf.lines[lineN+v.topline]
 
+		if len(v.messages) > 0 {
+			msgOnLine := false
+			for _, msg := range v.messages {
+				if msg.lineNum == lineN+v.topline {
+					msgOnLine = true
+					screen.SetContent(x, lineN, '>', nil, tcell.StyleDefault)
+					x++
+					screen.SetContent(x, lineN, '>', nil, tcell.StyleDefault)
+					x++
+					if v.cursor.y == lineN {
+						messenger.Message(msg.msg)
+					}
+				}
+			}
+			if !msgOnLine {
+				screen.SetContent(x, lineN, ' ', nil, tcell.StyleDefault)
+				x++
+				screen.SetContent(x, lineN, ' ', nil, tcell.StyleDefault)
+				x++
+				if v.cursor.y == lineN {
+					messenger.Reset()
+				}
+			}
+		}
+
 		// Write the line number
 		lineNumStyle := defStyle
 		if style, ok := colorscheme["line-number"]; ok {