show topics on home instead of replies

no template changes, instead of showing the latest x posts under
categories, we are now showing the latest x posts of the latest x
topics.

src/categories/recentreplies.js

@@ -23,6 +23,26 @@ module.exports = function(Categories) {
 		});
 	};
 
+	Categories.getRecentTopicReplies = function(cid, uid, count, callback) {
+		if (!parseInt(count, 10)) {
+			return callback(null, []);
+		}
+
+		db.getSortedSetRevRange('categories:' + cid + ':tid', 0, count - 1, function(err, tids) {
+			if (err || !tids || !tids.length) {
+				return callback(err, []);
+			}
+
+			async.map(tids, topics.getLatestUndeletedPid, function(err, pids) {
+				pids = pids.filter(function(pid) {
+					return !!pid;
+				});
+
+				posts.getPostSummaryByPids(pids, {stripTags: true}, callback);
+			});
+		});
+	};
+
 	Categories.moveRecentReplies = function(tid, oldCid, cid) {
 		function movePost(postData, next) {
 			async.parallel([

src/controllers/index.js

@@ -70,7 +70,7 @@ Controllers.home = function(req, res, next) {
 				}
 
 				function getRecentReplies(category, callback) {
-					categories.getRecentReplies(category.cid, uid, parseInt(category.numRecentReplies, 10), function (err, posts) {
+					categories.getRecentTopicReplies(category.cid, uid, parseInt(category.numRecentReplies, 10), function (err, posts) {
 						if (err) {
 							return callback(err);
 						}