Have CanClose use single letters for responses

Closes #184

cmd/micro/actions.go

@@ -989,7 +989,7 @@ func (v *View) OpenFile(usePlugin bool) bool {
 		return false
 	}
 
-	if v.CanClose("Continue? (yes, no, save) ") {
+	if v.CanClose("Continue? (y,n,s) ", 'y', 'n', 's') {
 		filename, canceled := messenger.Prompt("File to open: ", "Open", FileCompletion)
 		if canceled {
 			return false
@@ -1285,7 +1285,7 @@ func (v *View) Quit(usePlugin bool) bool {
 	}
 
 	// Make sure not to quit if there are unsaved changes
-	if v.CanClose("Quit anyway? (yes, no, save) ") {
+	if v.CanClose("Quit anyway? (y,n,s) ", 'y', 'n', 's') {
 		v.CloseBuffer()
 		if len(tabs[curTab].views) > 1 {
 			v.splitNode.Delete()

cmd/micro/messenger.go

@@ -124,6 +124,35 @@ func (m *Messenger) YesNoPrompt(prompt string) (bool, bool) {
 	}
 }
 
+// LetterPrompt gives the user a prompt and waits for a one letter response
+func (m *Messenger) LetterPrompt(prompt string, responses ...rune) (rune, bool) {
+	m.Message(prompt)
+
+	_, h := screen.Size()
+	for {
+		m.Clear()
+		m.Display()
+		screen.ShowCursor(Count(m.message), h-1)
+		screen.Show()
+		event := <-events
+
+		switch e := event.(type) {
+		case *tcell.EventKey:
+			switch e.Key() {
+			case tcell.KeyRune:
+				for _, r := range responses {
+					if e.Rune() == r {
+						m.Reset()
+						return r, false
+					}
+				}
+			case tcell.KeyCtrlC, tcell.KeyCtrlQ, tcell.KeyEscape:
+				return ' ', true
+			}
+		}
+	}
+}
+
 type Completion int
 
 const (

cmd/micro/view.go

@@ -169,13 +169,13 @@ func (v *View) ScrollDown(n int) {
 // If there are unsaved changes, the user will be asked if the view can be closed
 // causing them to lose the unsaved changes
 // The message is what to print after saying "You have unsaved changes. "
-func (v *View) CanClose(msg string) bool {
+func (v *View) CanClose(msg string, responses ...rune) bool {
 	if v.Buf.IsModified {
-		quit, canceled := messenger.Prompt("You have unsaved changes. "+msg, "Unsaved", NoCompletion)
+		char, canceled := messenger.LetterPrompt("You have unsaved changes. "+msg, responses...)
 		if !canceled {
-			if strings.ToLower(quit) == "yes" || strings.ToLower(quit) == "y" {
+			if char == 'y' {
 				return true
-			} else if strings.ToLower(quit) == "save" || strings.ToLower(quit) == "s" {
+			} else if char == 's' {
 				v.Save(true)
 				return true
 			}
@@ -217,7 +217,7 @@ func (v *View) CloseBuffer() {
 
 // ReOpen reloads the current buffer
 func (v *View) ReOpen() {
-	if v.CanClose("Continue? (yes, no, save) ") {
+	if v.CanClose("Continue? (y,n,s) ", 'y', 'n', 's') {
 		screen.Clear()
 		v.Buf.ReOpen()
 		v.Relocate()