Add an option to restrict tweets to a preferred language

README.md

@@ -25,7 +25,7 @@ client.get('statuses/user_timeline', params, function(error, tweets, response) {
 
 ## Installation
 
-`npm install twitter`
+`npm install twitter-lang`
 
 ## Quick Start
 
@@ -162,6 +162,20 @@ client.stream('statuses/filter', {track: 'javascript'}, function(stream) {
 });
 ```
 
+## Restricting Language
+
+```javascript
+var Twitter = require('twitter');
+
+var client = new Twitter({
+  consumer_key: '',
+  consumer_secret: '',
+  access_token_key: '',
+  access_token_secret: '',
+  language: 'en'
+});
+```
+
 **Note** twitter stream several types of events, see [the docs](https://dev.twitter.com/streaming/overview/messages-types) for more info. There is no canonical way of detecting tweets versus other messages, but some users have had success with the following strategy.
 
 ```javascript

lib/twitter.js

@@ -24,6 +24,7 @@ function Twitter(options) {
     access_token_key: null,
     access_token_secret: null,
     bearer_token: null,
+    language: null,
     rest_base: 'https://api.twitter.com/1.1',
     stream_base: 'https://stream.twitter.com/1.1',
     user_stream_base: 'https://userstream.twitter.com/1.1',
@@ -99,6 +100,10 @@ Twitter.prototype.__buildEndpoint = function(path, base) {
     endpoint += (path.split('.').pop() !== 'json') ? '.json' : '';
   }
 
+  if (this.options.language) {
+    endpoint += '?language=' + this.options.language;
+  }
+
   return endpoint;
 };