From 7f2a0cd88404e8ca2c51065521cbf0137967dd81 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Juhani=20Krekel=C3=A4?= <juhani@krekelä.fi>
Date: Mon, 11 Jan 2021 01:11:38 +0200
Subject: [PATCH] Add undo/redo all buttons for fast history traversal

---
 takhta.html | 26 ++++++++++++++++++++++++--
 1 file changed, 24 insertions(+), 2 deletions(-)

diff --git a/takhta.html b/takhta.html
index 811712a..e1b797a 100644
--- a/takhta.html
+++ b/takhta.html
@@ -211,11 +211,19 @@
 					<input type="button" value="Redo" onclick="redoMove()">
 					<input type="button" value="Flip board" onclick="flipBoard()">
 				</form>
-				<p><form id="shipping">
+			</p>
+			<p>
+				<form id="rewind">
+					<input type="button" value="Undo all" onclick="undoAll()">
+					<input type="button" value="Redo all" onclick="redoAll()">
+				</form>
+			</p>
+			<p>
+				<form id="shipping">
 					<input type="button" value="Download moves" onclick="download()">
 					<input type="file" id="moveupload" name="moveupload">
 					<button type="button"><label for="moveupload">Upload moves</label></button>
-				</form></p>
+				</form>
 			</p>
 			<p>
 				<form id="options">
@@ -650,6 +658,20 @@
 				return true;
 			}
 
+			function undoAll() {
+				while (moveHistory.length > 0) {
+					undoMove();
+				}
+			}
+
+			function redoAll() {
+				while (moveFuture.length > 0) {
+					if (!redoMove()) {
+						break;
+					}
+				}
+			}
+
 			function flipBoard() {
 				let oldBoard = document.getElementById('board').firstElementChild;