Add new filter to format long numbers according to GOV.UK content

guidelines, inserting commas every third digit

eg. 1000000 becomes 1,000,000

app/filters.js

@@ -1,3 +1,4 @@
+var dateFilter = require('nunjucks-date-filter')
 module.exports = function (env) {
   /**
    * Instantiate object used to store the methods registered as a
@@ -6,6 +7,9 @@ module.exports = function (env) {
    * @type {Object}
    */
   var filters = {}
+  filters.formatNumber = function (x) {
+    return x.toString().replace(/\B(?=(\d{3})+(?!\d))/g, ',')
+  }
 
   /* ------------------------------------------------------------------
     add your methods to the filters obj below this comment block:
@@ -41,5 +45,6 @@ module.exports = function (env) {
   /* ------------------------------------------------------------------
     keep the following line to return your filters to the app
   ------------------------------------------------------------------ */
+  filters.date = dateFilter
   return filters
 }

package.json

@@ -44,7 +44,8 @@
     "require-dir": "^1.0.0",
     "sync-request": "^6.0.0",
     "universal-analytics": "^0.4.16",
-    "uuid": "^3.2.1"
+    "uuid": "^3.2.1",
+    "nunjucks-date-filter": "^0.1.1"
   },
   "greenkeeper": {
     "ignore": [