add experimental operation history stack

1 files changed, 82 insertions, 0 deletions

diff --git a/tt-rss.js b/tt-rss.js
index 472c90a6b..863020505 100644
--- a/tt-rss.js
+++ b/tt-rss.js
@@ -20,6 +20,8 @@ var xmlhttp_ctr = Ajax.getTransport();
 
 var init_params = new Object();
 
+var op_history = new Array();
+
 function toggleTags() {
 	display_tags = !display_tags;
 
@@ -654,3 +656,83 @@ function feedEditSave() {
 	} 
 }
 
+function localHotkeyHandler(e) {
+
+	var keycode;
+
+	if (window.event) {
+		keycode = window.event.keyCode;
+	} else if (e) {
+		keycode = e.which;
+	}
+
+	var shift_key = false;
+
+	try {
+		shift_key = e.shiftKey;
+	} catch (e) { }
+
+	if (keycode == 66 && shift_key) { // shift-B
+
+		var op = history_pop();
+
+		if (op) {
+			var op_s = op.split(":");
+
+			var i;
+			for (i = 0; i < op_s.length; i++) {
+				if (op_s[i] == 'undefined') {
+					op_s[i] = undefined;
+				}
+
+				if (op_s[i] == 'false') {
+					op_s[i] = false;
+				}
+
+				if (op_s[i] == 'true') {
+					op_s[i] = true;
+				}
+				
+			}
+
+			debug("history split: " + op_s);
+
+			if (op_s[0] == "ARTICLE") {
+				debug("history: reverting to article " + op_s[1] + "/" + op_s[2]);
+				view(op_s[1], op_s[2], true);
+			}
+
+			if (op_s[0] == "FEED") {
+				viewfeed(op_s[1], op_s[2], op_s[3], op_s[4], true);
+			}
+
+		} else {
+			notify("No operation to undo");
+		}
+
+		return false;
+
+	}	
+
+	debug("LKP=" + keycode);
+}
+
+function history_push(op) {
+	debug("history_push: " + op);
+	op_history.push(op);
+
+	while (op_history.length > 30) {
+		op_history.shift();
+	}
+}
+
+function history_pop() {
+	var op = op_history.pop();
+	debug("history_pop: " + op);
+	return op;
+}
+
+function history_clear() {
+	debug("history_clear");
+	op_history.clear();
+}