closes #2515

src/posts.js

@@ -16,6 +16,7 @@ var async = require('async'),
 	require('./posts/create')(Posts);
 	require('./posts/delete')(Posts);
 	require('./posts/user')(Posts);
+	require('./posts/topics')(Posts);
 	require('./posts/category')(Posts);
 	require('./posts/summary')(Posts);
 	require('./posts/recent')(Posts);
@@ -25,20 +26,6 @@ var async = require('async'),
 		db.isSortedSetMember('posts:pid', pid, callback);
 	};
 
-	Posts.getPostsByTid = function(tid, set, start, end, uid, reverse, callback) {
-		Posts.getPidsFromSet(set, start, end, reverse, function(err, pids) {
-			if(err) {
-				return callback(err);
-			}
-
-			if(!Array.isArray(pids) || !pids.length) {
-				return callback(null, []);
-			}
-
-			Posts.getPostsByPids(pids, uid, callback);
-		});
-	};
-
 	Posts.getPidsFromSet = function(set, start, end, reverse, callback) {
 		if (isNaN(start) || isNaN(end)) {
 			return callback(null, []);
@@ -243,17 +230,6 @@ var async = require('async'),
 		});
 	};
 
-	Posts.isMain = function(pid, callback) {
-		Posts.getPostField(pid, 'tid', function(err, tid) {
-			if (err) {
-				return callback(err);
-			}
-			topics.getTopicField(tid, 'mainPid', function(err, mainPid) {
-				callback(err, parseInt(pid, 10) === parseInt(mainPid, 10));
-			});
-		});
-	};
-
 	Posts.updatePostVoteCount = function(pid, voteCount, callback) {
 		async.parallel([
 			function(next) {

src/posts/topics.js

@@ -0,0 +1,44 @@
+
+'use strict';
+
+var async = require('async'),
+	topics = require('../topics');
+
+module.exports = function(Posts) {
+
+	Posts.getPostsByTid = function(tid, set, start, end, uid, reverse, callback) {
+		Posts.getPidsFromSet(set, start, end, reverse, function(err, pids) {
+			if (err) {
+				return callback(err);
+			}
+
+			if (!Array.isArray(pids) || !pids.length) {
+				return callback(null, []);
+			}
+
+			Posts.getPostsByPids(pids, uid, callback);
+		});
+	};
+
+	Posts.isMain = function(pid, callback) {
+		Posts.getPostField(pid, 'tid', function(err, tid) {
+			if (err) {
+				return callback(err);
+			}
+			topics.getTopicField(tid, 'mainPid', function(err, mainPid) {
+				callback(err, parseInt(pid, 10) === parseInt(mainPid, 10));
+			});
+		});
+	};
+
+	Posts.getTopicFields = function(pid, fields, callback) {
+		Posts.getPostField(pid, 'tid', function(err, tid) {
+			if (err) {
+				return callback(err);
+			}
+
+			topics.getTopicFields(tid, fields, callback);
+		});
+	};
+
+};

src/socket.io/posts.js

@@ -16,6 +16,7 @@ var	async = require('async'),
 	groups = require('../groups'),
 	user = require('../user'),
 	websockets = require('./index'),
+	socketTopics = require('./topics'),
 	events = require('../events'),
 	utils = require('../../public/src/utils'),
 
@@ -345,9 +346,7 @@ function deleteOrRestore(command, socket, data, callback) {
 }
 
 SocketPosts.purge = function(socket, data, callback) {
-	if(!data || !parseInt(data.pid, 10)) {
+	function purgePost() {
-		return callback(new Error('[[error:invalid-data]]'));
-	}
 		postTools.purge(socket.uid, data.pid, function(err) {
 			if (err) {
 				return callback(err);
@@ -364,8 +363,47 @@ SocketPosts.purge = function(socket, data, callback) {
 
 			callback();
 		});	
+	}
+	
+	if (!data || !parseInt(data.pid, 10)) {
+		return callback(new Error('[[error:invalid-data]]'));
+	}
+
+	isMainAndLastPost(data.pid, function(err, results) {
+		if (err) {
+			return callback(err);
+		}
+
+		if (!results.isMain) {
+			return purgePost();
+		}
+
+		if (!results.isLast) {
+			return callback(new Error('[[error:cant-purge-main-post]]'));
+		}
+
+		posts.getTopicFields(data.pid, ['tid', 'cid'], function(err, topic) {
+			if (err) {
+				return callback(err);
+			}
+			socketTopics.doTopicAction('delete', 'event:topic_deleted', socket, {tids: [topic.tid], cid: topic.cid}, callback);
+		});
+	});
 };
 
+function isMainAndLastPost(pid, callback) {
+	async.parallel({
+		isMain: function(next) {
+			posts.isMain(pid, next);
+		},
+		isLast: function(next) {
+			posts.getTopicFields(pid, ['postcount'], function(err, topic) {
+				next(err, topic ? parseInt(topic.postcount, 10) === 1 : false);
+			});
+		}
+	}, callback);
+}
+
 SocketPosts.getPrivileges = function(socket, pids, callback) {
 	privileges.posts.get(pids, socket.uid, function(err, privileges) {
 		if (err) {

src/socket.io/topics.js

@@ -205,34 +205,34 @@ SocketTopics.markAsUnreadForAll = function(socket, tids, callback) {
 };
 
 SocketTopics.delete = function(socket, data, callback) {
-	doTopicAction('delete', 'event:topic_deleted', socket, data, callback);
+	SocketTopics.doTopicAction('delete', 'event:topic_deleted', socket, data, callback);
 };
 
 SocketTopics.restore = function(socket, data, callback) {
-	doTopicAction('restore', 'event:topic_restored', socket, data, callback);
+	SocketTopics.doTopicAction('restore', 'event:topic_restored', socket, data, callback);
 };
 
 SocketTopics.purge = function(socket, data, callback) {
-	doTopicAction('purge', 'event:topic_purged', socket, data, callback);
+	SocketTopics.doTopicAction('purge', 'event:topic_purged', socket, data, callback);
 };
 
 SocketTopics.lock = function(socket, data, callback) {
-	doTopicAction('lock', 'event:topic_locked', socket, data, callback);
+	SocketTopics.doTopicAction('lock', 'event:topic_locked', socket, data, callback);
 };
 
 SocketTopics.unlock = function(socket, data, callback) {
-	doTopicAction('unlock', 'event:topic_unlocked', socket, data, callback);
+	SocketTopics.doTopicAction('unlock', 'event:topic_unlocked', socket, data, callback);
 };
 
 SocketTopics.pin = function(socket, data, callback) {
-	doTopicAction('pin', 'event:topic_pinned', socket, data, callback);
+	SocketTopics.doTopicAction('pin', 'event:topic_pinned', socket, data, callback);
 };
 
 SocketTopics.unpin = function(socket, data, callback) {
-	doTopicAction('unpin', 'event:topic_unpinned', socket, data, callback);
+	SocketTopics.doTopicAction('unpin', 'event:topic_unpinned', socket, data, callback);
 };
 
-function doTopicAction(action, event, socket, data, callback) {
+SocketTopics.doTopicAction = function(action, event, socket, data, callback) {
 	if (!socket.uid) {
 		return;
 	}
@@ -274,7 +274,7 @@ function doTopicAction(action, event, socket, data, callback) {
 			});
 		});
 	}, callback);
-}
+};
 
 function emitToTopicAndCategory(event, data) {
 	websockets.in('topic_' + data.tid).emit(event, data);