Added ACP option to customise recent post

Before, could either be OP or last reply.

Now, you can choose between OP, last reply, or last post (which
includes OP)

install/data/defaults.json

@@ -31,7 +31,7 @@
     "profileImageDimension": 128,
     "requireEmailConfirmation": 0,
     "allowProfileImageUploads": 1,
-    "teaserPost": "last",
+    "teaserPost": "last-reply",
     "allowPrivateGroups": 1,
     "unreadCutoff": 2,
     "bookmarkThreshold": 5

src/categories/recentreplies.js

@@ -105,14 +105,7 @@ module.exports = function(Categories) {
 			function (next) {
 				topics.getTopicsFields(tids, ['tid', 'mainPid', 'slug', 'title', 'teaserPid', 'cid', 'postcount'], next);
 			},
-			function (_topicData, next) {
-				topicData = _topicData;
-				topicData.forEach(function(topic) {
-					topic.teaserPid = topic.teaserPid || topic.mainPid;
-				});
-
-				topics.getTeasers(topicData, next);
-			},
+			async.apply(topics.getTeasers, topicData),
 			function (teasers, next) {
 				teasers.forEach(function(teaser, index) {
 					if (teaser) {

src/topics/teaser.js

@@ -26,7 +26,24 @@ module.exports = function(Topics) {
 		topics.forEach(function(topic) {
 			counts.push(topic && (parseInt(topic.postcount, 10) || 0));
 			if (topic) {
-				teaserPids.push(meta.config.teaserPost === 'first' ? topic.mainPid : topic.teaserPid);
+				if (topic.teaserPid === 'null') {
+					delete topic.teaserPid;
+				}
+
+				switch(meta.config.teaserPost) {
+					case 'first':
+						teaserPids.push(topic.mainPid);
+						break;
+
+					case 'last-post':
+						teaserPids.push(topic.teaserPid || topic.mainPid);
+						break;
+
+					case 'last-reply':	// intentional fall-through
+					default:
+						teaserPids.push(topic.teaserPid);
+						break;
+				}
 			}
 		});
 
@@ -113,7 +130,11 @@ module.exports = function(Topics) {
 			}
 
 			pid = pid || null;
+			if (pid) {
 				Topics.setTopicField(tid, 'teaserPid', pid, callback);
+			} else {
+				Topics.deleteTopicField(tid, 'teaserPid', callback);
+			}
 		});
 	};
 };

src/views/admin/settings/post.tpl

@@ -83,7 +83,8 @@
 			<div class="form-group">
 				<label>Teaser Post</label>
 				<select class="form-control" data-field="teaserPost">
-					<option value="last">Last</option>
+					<option value="last-post">Last &ndash; Show the latest post, including the original post, if no replies</option>
+					<option value="last-reply">Last &ndash; Show the latest reply, or a "No replies" placeholder if no replies</option>
 					<option value="first">First</option>
 				</select>
 			</div>