DiffusionMercurialDiffQuery.php
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	<?php

	final class DiffusionMercurialDiffQuery extends DiffusionDiffQuery {

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

	$effective_commit = $this->getEffectiveCommit();
	if (!$effective_commit) {
	return null;
	}
	// TODO: This side effect is kind of skethcy.
	$drequest->setCommit($effective_commit);

	$query = DiffusionRawDiffQuery::newFromDiffusionRequest($drequest);
	$raw_diff = $query->loadRawDiff();

	$parser = new ArcanistDiffParser();

	$try_encoding = $repository->getDetail('encoding');
	if ($try_encoding) {
	$parser->setTryEncoding($try_encoding);
	}

	$parser->setDetectBinaryFiles(true);
	$changes = $parser->parseDiff($raw_diff);

	$diff = DifferentialDiff::newFromRawChanges($changes);
	$changesets = $diff->getChangesets();
	$changeset = reset($changesets);

	$this->renderingReference = $drequest->generateURI(
	array(
	'action' => 'rendering-ref',
	));

	return $changeset;
	}

	}