Add toArray filter and expose it to nunjucks

lib/plugins/helper/to_array.js

@@ -0,0 +1,13 @@
+'use strict';
+
+var _ = require('lodash');
+
+function toArray(value) {
+  if (_.isObject(value) && typeof value.toArray === 'function') {
+    return value.toArray();
+  }
+
+  return value;
+}
+
+module.exports = toArray;

lib/plugins/renderer/nunjucks.js

@@ -2,13 +2,18 @@
 
 var nunjucks = require('nunjucks');
 var fs = require('hexo-fs');
+var toArray = require('../helper/to_array');
 
-nunjucks.configure('views', {
+var env = nunjucks.configure({
   noCache: true,
   autoescape: false,
-  // throwOnUndefined: true
+  throwOnUndefined: false,
+  trimBlocks: false,
+  lstripBlocks: false
 });
 
+env.addFilter('toArray', toArray);
+
 function nunjucksRenderer(data, locals) {
   if ('text' in data) {
     return nunjucks.renderString(data.text, locals);