Move nunjucks middleware into own module

index.js

@@ -1,6 +1,7 @@
 const nunjucks            = require('nunjucks');
 const express             = require('express');
 const nunjucksFilters     = require('./lib/nunjucks-filters');
+const nunjucksMiddleware  = require('./lib/nunjucks-middleware');
 const controllers         = require('./controllers');
 const app                 = express();
 const port                = process.env.port || 3000;
@@ -8,13 +9,7 @@ const port            = process.env.port || 3000;
 app.set('nunjucksEnv', nunjucks.configure('views', { express: app }));
 nunjucksFilters(app);
 
-app.use((req, res, next) => {
-  req.app.settings.nunjucksEnv
-    .addGlobal('req', req)
-    .addGlobal('res', res);
-
-  next();
-});
+app.use(nunjucksMiddleware);
 
 app.get('/', controllers.listing);
 app.get('/node/:id', controllers.node);

lib/nunjucks-middleware.js

@@ -0,0 +1,7 @@
+module.exports = (req, res, next) => {
+  req.app.settings.nunjucksEnv
+    .addGlobal('req', req)
+    .addGlobal('res', res);
+
+  next();
+}