Require confirmation for quitting a 'dirty' document

src/common/document.ts

@@ -74,6 +74,8 @@ export class Document {
 
 		row.delete(at.x);
 		row.updateRender();
+
+		this.dirty = true;
 	}
 
 	public row(i: number): Row | null {

src/common/editor.ts

@@ -1,7 +1,13 @@
 import Ansi, { KeyCommand } from './ansi.ts';
 import Buffer from './buffer.ts';
 import Document from './document.ts';
-import { ITerminalSize, logToFile, Position, SCROLL_VERSION } from './mod.ts';
+import {
+	ITerminalSize,
+	logToFile,
+	Position,
+	SCROLL_QUIT_TIMES,
+	SCROLL_VERSION,
+} from './mod.ts';
 import Row from './row.ts';
 import { ctrlKey, maxAdd, posSub, truncate } from './utils.ts';
 
@@ -50,6 +56,11 @@ class Editor {
 	 * @private
 	 */
 	#statusTimeout: number = 0;
+	/**
+	 * The number of times required to quit a dirty document
+	 * @private
+	 */
+	#quitTimes: number = SCROLL_QUIT_TIMES;
 
 	constructor(terminalSize: ITerminalSize) {
 		this.#buffer = new Buffer();
@@ -95,6 +106,14 @@ class Editor {
 				break;
 
 			case ctrlKey('q'):
+				if (this.#quitTimes > 0 && this.#document.dirty) {
+					this.setStatusMessage(
+						'WARNING!!! File has unsaved changes. ' +
+							`Press Ctrl-Q ${this.#quitTimes} more times to quit.`,
+					);
+					this.#quitTimes--;
+					return true;
+				}
 				await this.clearScreen();
 				return false;
 
@@ -165,6 +184,11 @@ class Editor {
 				this.#cursor.x++;
 		}
 
+		if (this.#quitTimes < SCROLL_QUIT_TIMES) {
+			this.#quitTimes = SCROLL_QUIT_TIMES;
+			this.setStatusMessage('');
+		}
+
 		return true;
 	}
 

src/deno/ffi.ts

@@ -39,7 +39,13 @@ const DenoFFI: IFFI = {
 	tcsetattr,
 	cfmakeraw,
 	getPointer: Deno.UnsafePointer.of,
-	close: cStdLib.close,
+	close: () => {
+		try {
+			cStdLib.close();
+		} catch {
+			// The error thrown is annoying, but harmless.
+		}
+	},
 };
 
 export default DenoFFI;