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Editing File: /home/ubuntu/code_review/arcanist/src/query/ArcanistGitCommitMessageHardpointQuery.php

<?php

final class ArcanistGitCommitMessageHardpointQuery
  extends ArcanistWorkflowGitHardpointQuery {

public function getHardpoints() {
    return array(
      ArcanistCommitRef::HARDPOINT_MESSAGE,
    );
  }

protected function canLoadRef(ArcanistRef $ref) {
    return ($ref instanceof ArcanistCommitRef);
  }

public function loadHardpoint(array $refs, $hardpoint) {
    $api = $this->getRepositoryAPI();

$hashes = mpull($refs, 'getCommitHash');
    $unique_hashes = array_fuse($hashes);

// TODO: Update this to use "%B", see T5028. We can also bulk-resolve
    // these with "git show --quiet --format=... hash hash hash ... --".

$futures = array();
    foreach ($unique_hashes as $hash) {
      $futures[$hash] = $api->execFutureLocal(
        'log -n1 --format=%s %s --',
        '%s%n%n%b',
        gitsprintf('%s', $hash));
    }

yield $this->yieldFutures($futures);

$messages = array();
    foreach ($futures as $hash => $future) {
      list($stdout) = $future->resolvex();
      $messages[$hash] = $stdout;
    }

foreach ($hashes as $ref_key => $hash) {
      $hashes[$ref_key] = $messages[$hash];
    }

yield $this->yieldMap($hashes);
  }

}

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