<?php

final class DiffusionGitMergedCommitsQuery extends DiffusionMergedCommitsQuery {

  protected function executeQuery() {
    $request = $this->getRequest();
    $repository = $request->getRepository();

    list($parents) = $repository->execxLocalCommand(
      'log -n 1 --format=%s %s',
      '%P',
      $request->getCommit());
    $parents = preg_split('/\s+/', trim($parents));
    if (count($parents) < 2) {
      // This is not a merge commit, so it doesn't merge anything.
      return array();
    }

    // Get all of the commits which are not reachable from the first parent.
    // These are the commits this change merges.

    $first_parent = head($parents);
    list($logs) = $repository->execxLocalCommand(
      'log -n %d --format=%s %s %s --',
      // NOTE: "+ 1" accounts for the merge commit itself.
      $this->getLimit() + 1,
      '%H',
      $request->getCommit(),
      '^'.$first_parent);

    $hashes = explode("\n", trim($logs));

    // Remove the merge commit.
    $hashes = array_diff($hashes, array($request->getCommit()));

    return DiffusionQuery::loadHistoryForCommitIdentifiers(
      $hashes,
      $request);
  }

}