phorge-arcanist/src/lint/linter/ArcanistRubyLinter.php

<?php

/**
 * Uses "Ruby" to detect various errors in Ruby code.
 *
 * @group linter
 */
final class ArcanistRubyLinter extends ArcanistLinter {

  public function willLintPaths(array $paths) {
    return;
  }

  public function getLinterName() {
    return 'Ruby';
  }

  public function getLintSeverityMap() {
    return array();
  }

  public function getLintNameMap() {
    return array();
  }

  private function getRubyPath() {
    $ruby_bin = "ruby";

    // Use the Ruby prefix specified in the config file
    $working_copy = $this->getEngine()->getWorkingCopy();
    $prefix = $working_copy->getConfig('lint.ruby.prefix');
    if ($prefix !== null) {
      $ruby_bin = $prefix . $ruby_bin;
    }

    if (!Filesystem::pathExists($ruby_bin)) {

      list($err) = exec_manual('which %s', $ruby_bin);
      if ($err) {
        throw new ArcanistUsageException(
          "Ruby does not appear to be installed on this system. Install it or ".
          "add 'lint.ruby.prefix' in your .arcconfig to point to ".
          "the directory where it resides.");
      }
    }

    return $ruby_bin;
  }

  private function getMessageCodeSeverity($code) {
    return ArcanistLintSeverity::SEVERITY_ERROR;
  }

  public function lintPath($path) {
    $rubyp = $this->getRubyPath();
    $f = new ExecFuture("%s -wc", $rubyp);
    $f->write($this->getData($path));
    list($err, $stdout, $stderr) = $f->resolve();
    if ($err === 0 ) {
      return;
    }

    $lines = explode("\n", $stderr);
    $messages = array();
    foreach ($lines as $line) {
      $matches = null;
      if (!preg_match("/(.*?):(\d+): (.*?)$/", $line, $matches)) {
        continue;
      }
      foreach ($matches as $key => $match) {
        $matches[$key] = trim($match);
      }

      $code = head(explode(',', $matches[3]));

      $message = new ArcanistLintMessage();
      $message->setPath($path);
      $message->setLine($matches[2]);
      $message->setName($this->getLinterName() . " " . $code);
      $message->setDescription($matches[3]);
      $message->setSeverity($this->getMessageCodeSeverity($code));
      $this->addLintMessage($message);
    }
  }

}