added new option to disable post diffs /cc @BenLubar

src/posts/edit.js

@@ -5,6 +5,7 @@ var validator = require('validator');
 var _ = require('lodash');
 
 var db = require('../database');
+var meta = require('../meta');
 var topics = require('../topics');
 var user = require('../user');
 var privileges = require('../privileges');
@@ -66,6 +67,10 @@ module.exports = function (Posts) {
 				Posts.setPostFields(data.pid, postData, next);
 			},
 			function (next) {
+				if (parseInt(meta.config.enablePostHistory || 1, 10) !== 1) {
+					return setImmediate(next);
+				}
+
 				Posts.diffs.save(data.pid, oldContent, data.content, next);
 			},
 			function (next) {