Localize next link detection

README.md

@@ -44,12 +44,14 @@ google('node.js best practices', function (err, next, links){
 ```
 
 You can also specify the TLD of the Google search page and the language.
+If you change the language you must translate the next page results text to detect the corresponding link.
 
 ```js
 var google = require('google')
 
 google.lang = 'de'
 google.tld = 'de'
+google.nextText = 'Weiter'
 
 google('node.js best practices', function (err, next, links){
   …

lib/google.js

@@ -10,6 +10,8 @@ var nextSel = 'td.b a span'
 
 var URL = 'http://www.google.%s/search?hl=%s&q=%s&start=%s&sa=N&num=%s&ie=UTF-8&oe=UTF-8'
 
+var nextTextErrorMsg = 'Translate `google.nextText` option to selected language to detect next results link.'
+
 function google (query, callback) {
   igoogle(query, 0, callback)
 }
@@ -18,9 +20,11 @@ google.resultsPerPage = 10
 google.tld = 'com'
 google.lang = 'en'
 google.requestOptions = {}
+google.nextText = 'Next'
 
 var igoogle = function (query, start, callback) {
   if (google.resultsPerPage > 100) google.resultsPerPage = 100 // Google won't allow greater than 100 anyway
+  if (google.lang !== 'en' && google.nextText === 'Next') callback(new Error(nextTextErrorMsg, null, null))
 
   var newUrl = util.format(URL, google.tld, google.lang, querystring.escape(query), start, google.resultsPerPage)
   var requestOptions = {
@@ -60,7 +64,7 @@ var igoogle = function (query, start, callback) {
       })
 
       var nextFunc = null
-      if ($(nextSel).last().text() === 'Next') {
+      if ($(nextSel).last().text() === google.nextText) {
         nextFunc = function () {
           igoogle(query, start + google.resultsPerPage, callback)
         }

test/google.test.js

@@ -80,4 +80,36 @@ describe('+ google()', function () {
 
     })
   })
+
+  describe('when nextText and lang are set', function () {
+    it('should return next page search results', function (done) {
+      var nextCounter = 0
+      var allLinks = []
+      var query = 'Microsoft'
+
+      var finished = function () {
+        assert(allLinks.length > 25)
+        done()
+      }
+
+      google.resultsPerPage = 25
+      google.lang = 'it'
+      google.nextText = 'Avanti'
+      google(query, function (err, next, links) {
+        assert.ifError(err)
+        allLinks = allLinks.concat(links)
+        if (nextCounter < 2) {
+          if (next) {
+            nextCounter += 1
+            next()
+          } else {
+            finished()
+          }
+        } else {
+          finished()
+        }
+      })
+
+    })
+  })
 })