feat(options): accept options as 3rd param

The only option as of now is to skip the undefined ones

index.js

@@ -6,4 +6,4 @@
  * MIT Licensed
 */
 
-module.exports = require('./src/index').pope
+module.exports = require('./src/index').pope

readme.md

@@ -27,6 +27,23 @@ const pope = require('pope')
 pope('There are {{0}} emails in your inbox', [20])
 ```
 
+## Options
+
+You can also pass an options object, which takes only one param for now and that is `skipUndefined`. 
+
+If `skipUndefined` is set to true, all unfound variables will be untouched, whereas originally they get replaced with an empty string.
+
+```javascript
+const pope = require('pope')
+pope('There are {{0}} emails in your inbox', {}, {
+  skipUndefined: true
+})
+
+// returns - There are {{0}} emails in your inbox
+```
+
+
+
 ## The MIT License
 
 Copyright (c) 2015 Harminder Virk

src/index.js

@@ -39,18 +39,19 @@ var prop = function(obj, path) {
  * @return {String}
  * @public
  */
-var pope = function (string, data) {
-  var regex = /\{\{([\w\$\s]+)\}\}/gi
+var pope = function (string, data, options) {
+  options = options || { skipUndefined: false }
+  var regex = /\{{2}([\w\$\s]+)\}{2}/gi
   var result
   var formattedString = string
   while (result = regex.exec(string)){
     var item = result[1].trim()
     if(item) {
       var value = prop(data, item) || null
-      if(!value){
-        formattedString = formattedString.replace(result[0], '')
-      }else{
+      if (value) {
         formattedString = formattedString.replace(result[0], value)
+      } else if (!options.skipUndefined) {
+        formattedString = formattedString.replace(result[0], '')
       }
     }
   }

test/pope.spec.js

@@ -68,4 +68,8 @@ describe('pope', function   () {
     expect(pope("Hello {{ user_name }}", { user_name: 'virk' }).trim()).to.equal('Hello virk')
     expect(pope("Hello {{ $user_name }}", { '$user_name': 'virk' }).trim()).to.equal('Hello virk')
   })
+
+  it('skip undefined', function () {
+    expect(pope("Hello {{ user_name }}", {}, { skipUndefined: true }).trim()).to.equal('Hello {{ user_name }}')
+  })
 })