adding 'load more topics' button to topic admin

src/routes/admin.js

@@ -57,10 +57,7 @@ var user = require('./../user.js'),
 					}
 					break;
 				case 'topics':
-					topics.getAllTopics(function(topics) {
-						topics.sort(function(a, b) {
-							return b.timestamp - a.timestamp;
-						});
+					topics.getAllTopics(10, null, function(topics) {
 						res.json({
 							topics: topics
 						});

src/topics.js

@@ -184,9 +184,33 @@ marked.setOptions({
 		});
 	}
 
-	Topics.getAllTopics = function(callback) {
+	Topics.getAllTopics = function(limit, after, callback) {
 		RDB.smembers('topics:tid', function(err, tids) {
-			var topics = [];
+			var topics = [],
+				numTids, x;
+
+			// Sort into ascending order
+			tids.sort(function(a, b) { return a - b; });
+
+			// Eliminate everything after the "after" tid
+			if (after) {
+				for(x=0,numTids=tids.length;x<numTids;x++) {
+					if (tids[x] >= after) {
+						tids = tids.slice(0, x);
+						break;
+					}
+				}
+			}
+
+			if (limit) {
+				if (limit > 0 && limit < tids.length) {
+					tids = tids.slice(tids.length - limit);
+				}
+			}
+
+			// Sort into descending order
+			tids.sort(function(a, b) { return b - a; });
+
 			async.each(tids, function(tid, next) {
 				Topics.get_topic(tid, 0, function(topicData) {
 					topics.push(topicData);

src/websockets.js

@@ -121,7 +121,6 @@ var SocketIO = require('socket.io').listen(global.server, { log:false }),
 		});
 
 		// BEGIN: API calls (todo: organize)
-		//   julian: :^)
 
 		socket.on('api:updateHeader', function(data) {
 			if(uid) {
@@ -391,6 +390,12 @@ var SocketIO = require('socket.io').listen(global.server, { log:false }),
 				});
 			}
 		});
+
+		socket.on('api:admin.topics.getMore', function(data) {
+			topics.getAllTopics(data.limit, data.after, function(topics) {
+				socket.emit('api:admin.topics.getMore', JSON.stringify(topics));
+			});
+		});
 	});
 	
 }(SocketIO));