testing

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;
			}

			}