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PhabricatorDifferentialExtractWorkflow.php
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			<?php

			final class PhabricatorDifferentialExtractWorkflow
			extends PhabricatorDifferentialManagementWorkflow {

			protected function didConstruct() {
			$this
			->setName('extract')
			->setExamples('extract __commit__')
			->setSynopsis(pht('Extract a diff from a commit.'))
			->setArguments(
			array(
			array(
			'name' => 'extract',
			'wildcard' => true,
			'help' => pht('Commit to extract.'),
			),
			));
			}

			public function execute(PhutilArgumentParser $args) {
			$viewer = $this->getViewer();

			$extract = $args->getArg('extract');

			if (!$extract) {
			throw new PhutilArgumentUsageException(
			pht('Specify a commit to extract the diff from.'));
			}

			if (count($extract) > 1) {
			throw new PhutilArgumentUsageException(
			pht('Specify exactly one commit to extract.'));
			}

			$extract = head($extract);

			$commit = id(new DiffusionCommitQuery())
			->setViewer($viewer)
			->withIdentifiers(array($extract))
			->executeOne();

			if (!$commit) {
			throw new PhutilArgumentUsageException(
			pht(
			'Commit "%s" is not valid.',
			$extract));
			}

			$diff = id(new DifferentialDiffExtractionEngine())
			->setViewer($viewer)
			->newDiffFromCommit($commit);

			$uri = PhabricatorEnv::getProductionURI($diff->getURI());

			echo tsprintf(
			"%s\n\n %s\n",
			pht('Extracted diff from "%s":', $extract),
			$uri);
			}


			}