DiffusionGitExpandShortNameQuery.php
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	<?php

	final class DiffusionGitExpandShortNameQuery
	extends DiffusionExpandShortNameQuery {

	protected function executeQuery() {
	$repository = $this->getRepository();
	$commit = $this->getCommit();

	$future = $repository->getLocalCommandFuture(
	'cat-file --batch');
	$future->write($commit);
	list($stdout) = $future->resolvex();

	list($hash, $type) = explode(' ', $stdout);
	if ($type == 'missing') {
	throw new DiffusionExpandCommitQueryException(
	DiffusionExpandCommitQueryException::CODE_MISSING,
	"Bad commit '{$this->commit}'.");
	}

	switch ($type) {
	case 'tag':
	$this->commitType = 'tag';

	$matches = null;
	$ok = preg_match(
	'/^object ([a-f0-9]+)$.?\n\n(.)$/sm',
	$stdout,
	$matches);
	if (!$ok) {
	throw new DiffusionExpandCommitQueryException(
	DiffusionExpandCommitQueryException::CODE_UNPARSEABLE,
	"Unparseable output from cat-file: {$stdout}");
	}

	$hash = $matches[1];
	$this->tagContent = trim($matches[2]);
	break;
	case 'commit':
	break;
	default:
	throw new DiffusionExpandCommitQueryException(
	DiffusionExpandCommitQueryException::CODE_INVALID,
	"The reference '{$this->commit}' does not name a valid ".
	'commit or a tag in this repository.');
	break;
	}

	$this->commit = $hash;
	}
	}