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   1  <?php
   2  
   3  final class DiffusionLowLevelParentsQuery
   4    extends DiffusionLowLevelQuery {
   5  
   6    private $identifier;
   7  
   8    public function withIdentifier($identifier) {
   9      $this->identifier = $identifier;
  10      return $this;
  11    }
  12  
  13    public function executeQuery() {
  14      if (!strlen($this->identifier)) {
  15        throw new Exception(
  16          pht('You must provide an identifier with withIdentifier()!'));
  17      }
  18  
  19      $type = $this->getRepository()->getVersionControlSystem();
  20      switch ($type) {
  21        case PhabricatorRepositoryType::REPOSITORY_TYPE_GIT:
  22          $result = $this->loadGitParents();
  23          break;
  24        case PhabricatorRepositoryType::REPOSITORY_TYPE_MERCURIAL:
  25          $result = $this->loadMercurialParents();
  26          break;
  27        case PhabricatorRepositoryType::REPOSITORY_TYPE_SVN:
  28          $result = $this->loadSubversionParents();
  29          break;
  30        default:
  31          throw new Exception(pht('Unsupported repository type "%s"!', $type));
  32      }
  33  
  34      return $result;
  35    }
  36  
  37    private function loadGitParents() {
  38      $repository = $this->getRepository();
  39  
  40      list($stdout) = $repository->execxLocalCommand(
  41        'log -n 1 --format=%s %s',
  42        '%P',
  43        $this->identifier);
  44  
  45      return preg_split('/\s+/', trim($stdout));
  46    }
  47  
  48    private function loadMercurialParents() {
  49      $repository = $this->getRepository();
  50  
  51      list($stdout) = $repository->execxLocalCommand(
  52        'log --debug --limit 1 --template={parents} --rev %s',
  53        $this->identifier);
  54      $stdout = PhabricatorRepository::filterMercurialDebugOutput($stdout);
  55  
  56      $hashes = preg_split('/\s+/', trim($stdout));
  57      foreach ($hashes as $key => $value) {
  58        // Mercurial parents look like "23:ad9f769d6f786fad9f76d9a" -- we want
  59        // to strip out the local rev part.
  60        list($local, $global) = explode(':', $value);
  61        $hashes[$key] = $global;
  62  
  63        // With --debug we get 40-character hashes but also get the "000000..."
  64        // hash for missing parents; ignore it.
  65        if (preg_match('/^0+$/', $global)) {
  66          unset($hashes[$key]);
  67        }
  68      }
  69  
  70      return $hashes;
  71    }
  72  
  73    private function loadSubversionParents() {
  74      $n = (int)$this->identifier;
  75      if ($n > 1) {
  76        $ids = array($n - 1);
  77      } else {
  78        $ids = array();
  79      }
  80  
  81      return $ids;
  82    }
  83  
  84  }