add experimental operation history stack

[tt-rss.git] / tt-rss.js

diff --git a/tt-rss.js b/tt-rss.js
index 472c90a6b0fad1c8779b013363decf2b5f479774..8630205055cf8347df4f382f5082be11ea052e59 100644 (file)
--- 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();
+}