Missing search commits api endpoint

doc/search.md

@@ -34,6 +34,12 @@ Returns a list of issues found by such criteria.
 $users = $client->api('search')->users('location:Amsterdam language:php');
 ```
 
+### Search commits
+
+```php
+$commits = $client->api('search')->commits('repo:octocat/Spoon-Knife+css');
+```
+
 Returns a list of users found by such criteria.
 
 ### Sorting results
@@ -45,4 +51,5 @@ $repos = $client->api('search')->repositories('...', 'created', 'asc');
 $files = $client->api('search')->code('...........', 'indexed', 'desc');
 $issues = $client->api('search')->issues('.........', 'comments', 'asc');
 $users = $client->api('search')->users('..........', 'followers', 'asc');
+$commits = $client->api('search')->commits('..........', 'author-date', 'desc');
 ```

lib/Github/Api/Search.php

@@ -10,6 +10,8 @@
  */
 class Search extends AbstractApi
 {
+    use AcceptHeaderTrait;
+
     /**
      * Search repositories by filter (q).
      *
@@ -73,4 +75,23 @@ public function users($q, $sort = 'updated', $order = 'desc')
     {
         return $this->get('/search/users', array('q' => $q, 'sort' => $sort, 'order' => $order));
     }
+
+    /**
+     * Search commits by filter (q).
+     *
+     * @link https://developer.github.com/v3/search/#search-commits
+     *
+     * @param string $q     the filter
+     * @param string $sort  the sort field
+     * @param string $order sort order. asc/desc
+     *
+     * @return array
+     */
+    public function commits($q, $sort = null, $order = 'desc')
+    {
+        //This api is in preview mode, so set the correct accept-header
+        $this->acceptHeaderValue = 'application/vnd.github.cloak-preview';
+
+        return $this->get('/search/commits', array('q' => $q, 'sort' => $sort, 'order' => $order));
+    }
 }

test/Github/Tests/Api/SearchTest.php

@@ -176,6 +176,26 @@ public function shouldSearchUsersRegardingSortAndOrder()
         );
     }
 
+    /**
+     * @test
+     */
+    public function shouldSearchCommitsRegardingSortAndOrder()
+    {
+        $expectedArray = ['total_count' => '0'];
+
+        $api = $this->getApiMock();
+
+        $api->expects($this->once())
+            ->method('get')
+            ->with('/search/commits', ['q' => 'query text', 'sort' => 'author-date', 'order' => 'asc'])
+            ->will($this->returnValue($expectedArray));
+
+        $this->assertEquals(
+            $expectedArray,
+            $api->commits('query text', 'author-date', 'asc')
+        );
+    }
+
     /**
      * @return string
      */