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DifferentialRepositoryLookup.php
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			<?php

			/**
			* Guess which tracked repository a diff comes from.
			*/
			final class DifferentialRepositoryLookup extends Phobject {

			private $viewer;
			private $diff;

			public function setDiff(DifferentialDiff $diff) {
			$this->diff = $diff;
			return $this;
			}

			public function setViewer(PhabricatorUser $viewer) {
			$this->viewer = $viewer;
			return $this;
			}

			public function lookupRepository() {
			$viewer = $this->viewer;
			$diff = $this->diff;

			// Look for a repository UUID.
			if ($diff->getRepositoryUUID()) {
			$repositories = id(new PhabricatorRepositoryQuery())
			->setViewer($viewer)
			->withUUIDs(array($diff->getRepositoryUUID()))
			->execute();
			if ($repositories) {
			return head($repositories);
			}
			}

			// Look for the base commit in Git and Mercurial.
			$vcs = $diff->getSourceControlSystem();
			$vcs_git = PhabricatorRepositoryType::REPOSITORY_TYPE_GIT;
			$vcs_hg = PhabricatorRepositoryType::REPOSITORY_TYPE_MERCURIAL;
			if ($vcs == $vcs_git \|\| $vcs == $vcs_hg) {
			$base = $diff->getSourceControlBaseRevision();
			if ($base) {
			$commits = id(new DiffusionCommitQuery())
			->setViewer($viewer)
			->withIdentifiers(array($base))
			->execute();
			$commits = mgroup($commits, 'getRepositoryID');
			if (count($commits) == 1) {
			$repository_id = key($commits);
			$repositories = id(new PhabricatorRepositoryQuery())
			->setViewer($viewer)
			->withIDs(array($repository_id))
			->execute();
			if ($repositories) {
			return head($repositories);
			}
			}
			}
			}

			// TODO: Compare SVN remote URIs? Compare Git/Hg remote URIs? Add
			// an explicit option to `.arcconfig`?

			return null;
			}

			}