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DifferentialRevisionEditController.php
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			<?php

			final class DifferentialRevisionEditController
			extends DifferentialController {

			public function handleRequest(AphrontRequest $request) {
			$viewer = $this->getViewer();

			// If we have a Diff ID, this is an "/attach/123/to/456/" action. The
			// user just created a diff and is trying to use it to create or update
			// a revision.
			$diff_id = $request->getURIData('diffID');

			if ($diff_id) {
			$diff = id(new DifferentialDiffQuery())
			->setViewer($viewer)
			->withIDs(array($diff_id))
			->executeOne();
			if (!$diff) {
			return new Aphront404Response();
			}

			if ($diff->getRevisionID()) {
			$revision = $diff->getRevision();
			return $this->newDialog()
			->setTitle(pht('Diff Already Attached'))
			->appendParagraph(
			pht(
			'This diff is already attached to a revision.'))
			->addCancelButton($revision->getURI(), pht('Continue'));
			}
			} else {
			$diff = null;
			}

			$revision_id = $request->getURIData('id');
			if (!$diff && !$revision_id) {
			return $this->newDialog()
			->setTitle(pht('Diff Required'))
			->appendParagraph(
			pht(
			'You can not create a revision without a diff.'))
			->addCancelButton($this->getApplicationURI());
			}

			$engine = id(new DifferentialRevisionEditEngine())
			->setController($this);

			if ($diff) {
			$engine->setDiff($diff);
			}

			return $engine->buildResponse();
			}

			}