Add quit confirmation for modified document

editor/constants.go

@@ -4,5 +4,8 @@ package editor
 // !Constants
 // ----------------------------------------------------------------------------
 
-const KiloVersion = "0.0.1"
-const KiloTabStop = 4
+const (
+	KiloVersion = "0.0.1"
+	KiloTabStop = 4
+	KiloQuitTimes = 3
+)

editor/editor.go

@@ -27,6 +27,7 @@ type editor struct {
 	offset   *point
 	document *document
 	status   *statusMsg
+	quitTimes uint8
 	renderX  int
 }
 
@@ -50,6 +51,7 @@ func New() *editor {
 		offset,
 		document,
 		status,
+		KiloQuitTimes,
 		0,
 	}
 }
@@ -80,6 +82,13 @@ func (e *editor) ProcessKeypress() bool {
 
 	switch ch {
 	case key.Ctrl('q'):
+		if e.document.dirty && e.quitTimes > 0 {
+			e.SetStatusMessage("WARNING!!! File has unsaved changes. Press Ctrl-Q %d more tiems to quite.", e.quitTimes)
+			e.quitTimes -= 1
+
+			return true
+		}
+
 		// Clean up on exit
 		terminal.Write(terminal.ClearScreen + terminal.ResetCursor)
 
@@ -113,6 +122,10 @@ func (e *editor) ProcessKeypress() bool {
 		e.insertChar(ch)
 	}
 
+	if e.quitTimes != KiloQuitTimes {
+		e.quitTimes = KiloQuitTimes
+	}
+
 	return true
 }