add hotkey (f x) to reverse headlines order (closes #262)

help/3.php

@@ -47,6 +47,7 @@
 		<tr><td class='n'>f w</td><td><?php echo __("Sort by name or unread count") ?></td></tr>
 		<tr><td class='n'>f h</td><td><?php echo __("Hide visible read articles") ?></td></tr>
 		<tr><td class='n'>f q</td><td><?php echo __("Mark feed as read") ?></td></tr>
+		<tr><td class='n'>f x</td><td><?php echo __("Reverse headlines order") ?></td></tr>
 		<tr><td class='n'>Q</td><td><?php echo __("Mark all feeds as read") ?></td></tr>
 		<tr><td class='n'>x</td><td><?php echo __("If viewing category, (un)collapse it") ?></td></tr>
 	</table>

modules/backend-rpc.php

@@ -123,11 +123,23 @@
 
 		}
 
-		if ($subop == "setpref") {
+		if ($subop == "togglepref") {
-			if (WEB_DEMO_MODE) {
+			print "<rpc-reply>";
-				return;
-			}
 
+			$key = db_escape_string($_REQUEST["key"]);
+
+			set_pref($link, $key, !get_pref($link, $key));
+
+			$value = get_pref($link, $key);
+
+			print "<param-set key=\"$key\" value=\"$value\"/>";
+
+			print "</rpc-reply>";
+
+			return;
+		}
+
+		if ($subop == "setpref") {
 			print "<rpc-reply>";
 
 			$key = db_escape_string($_REQUEST["key"]);

tt-rss.js

@@ -1251,6 +1251,10 @@ function hotkey_handler(e) {
 				return;
 			}
 
+			if (keycode == 88) { // x
+				reverseHeadlineOrder();
+				return;
+			}
 		}
 
 		/* Prefix c */
@@ -1364,3 +1368,19 @@ function feedsSortByUnread() {
 function inPreferences() {
 	return false;
 }
+
+function reverseHeadlineOrder() {
+	try {
+
+		var query_str = "?op=rpc&subop=togglepref&key=REVERSE_HEADLINES";
+
+		new Ajax.Request("backend.php", {
+			parameters: query_str,
+			onComplete: function(transport) { 
+					viewCurrentFeed();
+				} });
+
+	} catch (e) {
+		exception_error("reverseHeadlineOrder", e);
+	}
+}