NuanceManagementWorkflow.php
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	<?php

	abstract class NuanceManagementWorkflow
	extends PhabricatorManagementWorkflow {

	protected function loadSource(PhutilArgumentParser $argv, $key) {
	$source = $argv->getArg($key);
	if (!strlen($source)) {
	throw new PhutilArgumentUsageException(
	pht(
	'Specify a source with %s.',
	'--'.$key));
	}

	$query = id(new NuanceSourceQuery())
	->setViewer($this->getViewer())
	->setRaisePolicyExceptions(true);

	$type_unknown = PhabricatorPHIDConstants::PHID_TYPE_UNKNOWN;

	if (ctype_digit($source)) {
	$kind = 'id';
	$query->withIDs(array($source));
	} else if (phid_get_type($source) !== $type_unknown) {
	$kind = 'phid';
	$query->withPHIDs($source);
	} else {
	$kind = 'name';
	$query->withNameNgrams($source);
	}

	$sources = $query->execute();

	if (!$sources) {
	switch ($kind) {
	case 'id':
	$message = pht(
	'No source exists with ID "%s".',
	$source);
	break;
	case 'phid':
	$message = pht(
	'No source exists with PHID "%s".',
	$source);
	break;
	default:
	$message = pht(
	'No source exists with a name matching "%s".',
	$source);
	break;
	}

	throw new PhutilArgumentUsageException($message);
	} else if (count($sources) > 1) {
	$message = pht(
	'More than one source matches "%s". Choose a narrower query, or '.
	'use an ID or PHID to select a source. Matching sources: %s.',
	$source,
	implode(', ', mpull($sources, 'getName')));

	throw new PhutilArgumentUsageException($message);
	}

	return head($sources);
	}

	}