Modernize ArcanistPhpcsLinter

Summary: Allow `--severity` to be specified using `.arclint`.

Test Plan: `arc unit`

Reviewers: #blessed_reviewers, epriestley

Reviewed By: #blessed_reviewers, epriestley

Subscribers: Korvin, epriestley

Differential Revision: https://secure.phabricator.com/D11511

src/lint/linter/ArcanistPhpcsLinter.php

@@ -5,7 +5,7 @@
  */
 final class ArcanistPhpcsLinter extends ArcanistExternalLinter {
 
-  private $reports;
+  private $standard;
 
   public function getInfoName() {
     return 'PHP_CodeSniffer';
@@ -29,14 +29,42 @@ final class ArcanistPhpcsLinter extends ArcanistExternalLinter {
     return 'phpcs';
   }
 
-  protected function getMandatoryFlags() {
-    return array('--report=xml');
-  }
-
   public function getInstallInstructions() {
     return pht('Install PHPCS with `pear install PHP_CodeSniffer`.');
   }
 
+  public function getLinterConfigurationOptions() {
+    $options = array(
+      'phpcs.standard' => array(
+        'type' => 'optional string',
+        'help' => pht('The name or path of the coding standard to use.'),
+      ),
+    );
+
+    return $options + parent::getLinterConfigurationOptions();
+  }
+
+  public function setLinterConfigurationValue($key, $value) {
+    switch ($key) {
+      case 'phpcs.standard':
+        $this->standard = $value;
+        return;
+
+      default:
+        return parent::setLinterConfigurationValue($key, $value);
+    }
+  }
+
+  protected function getMandatoryFlags() {
+    $options = array('--report=xml');
+
+    if ($this->standard) {
+      $options[] = '--standard='.$this->standard;
+    }
+
+    return $options;
+  }
+
   protected function getDefaultFlags() {
     $options = $this->getDeprecatedConfiguration('lint.phpcs.options', array());
     $standard = $this->getDeprecatedConfiguration('lint.phpcs.standard');