Add flags and yes no prompt

src/command.go

@@ -39,11 +39,17 @@ func HandleCommand(input string, view *View) {
 	case "replace":
 		r := regexp.MustCompile(`"[^"\\]*(?:\\.[^"\\]*)*"|[^\s]*`)
 		replaceCmd := r.FindAllString(strings.Join(args, " "), -1)
-		if len(replaceCmd) != 2 {
+		if len(replaceCmd) < 2 {
 			messenger.Error("Invalid replace statement: " + strings.Join(args, " "))
 			return
 		}
 
+		var flags string
+		if len(replaceCmd) == 3 {
+			// The user included some flags
+			flags = replaceCmd[2]
+		}
+
 		search := string(replaceCmd[0])
 		replace := string(replaceCmd[1])
 
@@ -57,7 +63,7 @@ func HandleCommand(input string, view *View) {
 		search = strings.Replace(search, `\"`, `"`, -1)
 		replace = strings.Replace(replace, `\"`, `"`, -1)
 
-		messenger.Error(search + " -> " + replace)
+		// messenger.Error(search + " -> " + replace)
 
 		regex, err := regexp.Compile(search)
 		if err != nil {
@@ -65,13 +71,26 @@ func HandleCommand(input string, view *View) {
 			return
 		}
 
+		found := false
 		for {
 			match := regex.FindStringIndex(view.buf.text)
 			if match == nil {
 				break
 			}
+			found = true
+			if strings.Contains(flags, "c") {
+				// 	// The 'check' flag was used
+				// 	if messenger.YesNoPrompt("Perform replacement?") {
+				// 		view.eh.Replace(match[0], match[1], replace)
+				// 	} else {
+				// 		continue
+				// 	}
+			}
 			view.eh.Replace(match[0], match[1], replace)
 		}
+		if !found {
+			messenger.Message("Nothing matched " + search)
+		}
 	default:
 		messenger.Error("Unknown command: " + cmd)
 	}

src/messenger.go

@@ -71,6 +71,29 @@ func (m *Messenger) Error(msg string) {
 	m.hasMessage = true
 }
 
+// YesNoPrompt asks the user a yes or no question (waits for y or n) and returns the result
+func (m *Messenger) YesNoPrompt(prompt string) bool {
+	m.Message(prompt)
+
+	for {
+		m.Clear()
+		m.Display()
+		screen.Show()
+		event := screen.PollEvent()
+
+		switch e := event.(type) {
+		case *tcell.EventKey:
+			if e.Key() == tcell.KeyRune {
+				if e.Rune() == 'y' {
+					return true
+				} else if e.Rune() == 'n' {
+					return false
+				}
+			}
+		}
+	}
+}
+
 // Prompt sends the user a message and waits for a response to be typed in
 // This function blocks the main loop while waiting for input
 func (m *Messenger) Prompt(prompt string) (string, bool) {