showing history state in post tools load

src/posts/diffs.js

@@ -8,6 +8,12 @@ var diff = require('diff');
 module.exports = function (Posts) {
 	Posts.diffs = {};
 
+	Posts.diffs.exists = function (pid, callback) {
+		db.sortedSetCard('post:' + pid + ':diffs', function (err, numDiffs) {
+			return callback(err, numDiffs > 0);
+		});
+	};
+
 	Posts.diffs.list = function (pid, callback) {
 		db.getSortedSetRangeWithScores('post:' + pid + ':diffs', 0, -1, function (err, diffs) {
 			callback(err, diffs ? diffs.map(function (diffObj) {

src/socket.io/posts/tools.js

@@ -51,6 +51,7 @@ module.exports = function (SocketPosts) {
 					postSharing: function (next) {
 						social.getActivePostSharing(next);
 					},
+					history: async.apply(posts.diffs.exists, data.pid),
 				}, next);
 			},
 			function (results, next) {
@@ -64,6 +65,7 @@ module.exports = function (SocketPosts) {
 				results.posts.display_moderator_tools = results.posts.display_edit_tools || results.posts.display_delete_tools;
 				results.posts.display_move_tools = results.isAdmin || results.isModerator;
 				results.posts.display_ip_ban = (results.isAdmin || results.isGlobalMod) && !results.posts.selfPost;
+				results.posts.display_history = results.history;
 
 				if (!results.isAdmin && !results.isGlobalMod && !results.isModerator) {
 					results.posts.ip = undefined;