Save cursor position

index.html

@@ -12,6 +12,7 @@
 
 	<script src="codemirror/codemirror.js"></script>
 	<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.1.0/jquery.min.js"></script>
+	<script src="https://cdn.jsdelivr.net/localforage/1.4.2/localforage.min.js"></script>
 	<script src="languages.js"></script>
 	<script src="main.js"></script>
 </body>

main.js

@@ -5,11 +5,14 @@ var focused = false;
 let invalids = [];
 
 // fetch file and setup
-let file = window.location.hash.substring(1);
+let hash = window.location.hash.substring(1);
+let hashBits = hash.split("/");
+let repo = hashBits.slice(0, 3).join("/");
+let filePath = hashBits.slice(3, hashBits.length).join("/");
 $.get({
-	url: `https://raw.githubusercontent.com/${file}`,
+	url: `https://raw.githubusercontent.com/${repo}/${filePath}`,
 	success: (code) => {
-		let parts = file.split(".");
+		let parts = filePath.split(".");
 		let fileExtension = parts[parts.length - 1];
 		let lang = getLanguageByExtension(fileExtension);
 		$.get({
@@ -40,7 +43,19 @@ function setup(data, mime) {
 
 	editor.setSize("100%", "100%");
 
-	incompleteMark = editor.doc.markText({ line: 0, ch: 0 }, getEndPos(), {
+	localforage.getItem(repo)
+		.then((val) => {
+			var startPos; // the initial position of the cursor
+			if (val && val[filePath] && val[filePath].pos) {
+				startPos = val[filePath].pos;
+			} else {
+				startPos = { line: 0, ch: 0 };
+			}
+
+			saveCursor();
+			editor.setCursor(startPos);
+
+			incompleteMark = editor.doc.markText(editor.getCursor(), getEndPos(), {
 				className: "incomplete"
 			});
 
@@ -141,6 +156,11 @@ function setup(data, mime) {
 					}
 				}
 			});
+
+		})
+		.catch((e) => {
+			throw e;
+		});
 }
 
 function moveToEndOfPreviousLine() {
@@ -202,6 +222,25 @@ function updateIncompleteMark() {
 	});
 }
 
+function saveCursor() {
+	localforage.getItem(repo)
+		.then((val) => {
+			if (!val) val = {};
+
+			val[filePath] = {
+				pos: editor.getCursor()
+			};
+			localforage.setItem(repo, val)
+				.catch((e) => {
+					throw e;
+				});
+		})
+		.catch((e) => {
+			throw e;
+		});
+	setTimeout(saveCursor, 15000);
+}
+
 String.prototype.hasOnlyWhiteSpaceBeforeIndex = function(index) {
 	return this.substring(index) == this.trim();
 };