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PhabricatorConfigManagementDeleteWorkflow.php
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			<?php

			final class PhabricatorConfigManagementDeleteWorkflow
			extends PhabricatorConfigManagementWorkflow {

			protected function didConstruct() {
			$this
			->setName('delete')
			->setExamples('delete __key__')
			->setSynopsis(pht('Delete a local configuration value.'))
			->setArguments(
			array(
			array(
			'name' => 'database',
			'help' => pht(
			'Delete configuration in the database instead of '.
			'in local configuration.'),
			),
			array(
			'name' => 'args',
			'wildcard' => true,
			),
			));
			}

			public function execute(PhutilArgumentParser $args) {
			$console = PhutilConsole::getConsole();

			$argv = $args->getArg('args');
			if (count($argv) == 0) {
			throw new PhutilArgumentUsageException(
			pht('Specify a configuration key to delete.'));
			}

			$key = $argv[0];

			if (count($argv) > 1) {
			throw new PhutilArgumentUsageException(
			pht('Too many arguments: expected one key.'));
			}


			$use_database = $args->getArg('database');
			if ($use_database) {
			$config = new PhabricatorConfigDatabaseSource('default');
			$config_type = 'database';
			} else {
			$config = new PhabricatorConfigLocalSource();
			$config_type = 'local';
			}
			$values = $config->getKeys(array($key));
			if (!$values) {
			throw new PhutilArgumentUsageException(
			pht(
			"Configuration key '%s' is not set in %s configuration!",
			$key,
			$config_type));
			}

			if ($use_database) {
			$config_entry = PhabricatorConfigEntry::loadConfigEntry($key);
			$config_entry->setIsDeleted(1);
			$config_entry->save();
			} else {
			$config->deleteKeys(array($key));
			}

			$console->writeOut(
			"%s\n",
			pht("Deleted '%s' from %s configuration.", $key, $config_type));
			}

			}