Adding actual sniff file

Author: javorszky

src/Sniffer.php

@@ -0,0 +1,56 @@
+<?php
+/**
+ * PHP Composter PHP Code Sniffer WordPress Coding Standards Action.
+ *
+ * @package   PHPComposter\PHPComposter_PHPCS_WPCS
+ * @author    Gabor Javorszky <[email protected]>
+ * @license   MIT
+ * @link      https://javorszky.co.uk
+ * @copyright 2017 Gabor Javorszky
+ */
+
+namespace PHPComposter\PHPComposter_PHPCS_WPCS;
+
+use PHP_CodeSniffer_CLI;
+use PHPComposter\PHPComposter\BaseAction;
+
+/**
+ * Class Sniffer.
+ *
+ * @since   0.1.0
+ *
+ * @package PHPComposter\PHPComposter_PHPCS_WPCS
+ * @author    Gabor Javorszky <[email protected]>
+ */
+class Sniffer extends BaseAction
+{
+
+    /**
+     * Run PHP Code Sniffer over PHP files as pre-commit hook.
+     *
+     * @since 0.1.0
+     */
+    public function preCommit()
+    {
+        $files = $this->getStagedFiles('/*.php$');
+        if (empty($files)) {
+            return;
+        }
+
+        echo 'Running PHP CodeSniffer in ' . $this->root . PHP_EOL;
+        $sniffer = new PHP_CodeSniffer_CLI();
+
+        ob_start();
+        $numErrors = $sniffer->process(array('standard' => 'WordPress-Extra', 'files' => $files));
+        $output    = ob_get_clean();
+
+        echo $output . PHP_EOL;
+
+        if ($numErrors === 0) {
+            exit(0);
+        } else {
+            echo 'PHP Code Sniffer found errors! Aborting Commit.' . PHP_EOL;
+            exit(1);
+        }
+    }
+}