DiffusionLowLevelCommitQuery.php
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	<?php

	/**
	* Populate a @{class:DiffusionCommitRef} with information about a specific
	* commit in a repository. This is a low-level query which talks directly to
	* the underlying VCS.
	*/
	final class DiffusionLowLevelCommitQuery
	extends DiffusionLowLevelQuery {

	private $identifier;

	public function withIdentifier($identifier) {
	$this->identifier = $identifier;
	return $this;
	}

	protected function executeQuery() {
	if (!strlen($this->identifier)) {
	throw new Exception(
	pht('You must provide an identifier with withIdentifier()!'));
	}

	$type = $this->getRepository()->getVersionControlSystem();
	switch ($type) {
	case PhabricatorRepositoryType::REPOSITORY_TYPE_GIT:
	$result = $this->loadGitCommitRef();
	break;
	case PhabricatorRepositoryType::REPOSITORY_TYPE_MERCURIAL:
	$result = $this->loadMercurialCommitRef();
	break;
	case PhabricatorRepositoryType::REPOSITORY_TYPE_SVN:
	$result = $this->loadSubversionCommitRef();
	break;
	default:
	throw new Exception(pht('Unsupported repository type "%s"!', $type));
	}

	return $result;
	}

	private function loadGitCommitRef() {
	$repository = $this->getRepository();

	// NOTE: %B was introduced somewhat recently in git's history, so pull
	// commit message information with %s and %b instead.

	// Even though we pass --encoding here, git doesn't always succeed, so
	// we try a little harder, since git does tell us what the actual encoding
	// is correctly (unless it doesn't; encoding is sometimes empty).
	list($info) = $repository->execxLocalCommand(
	'log -n 1 --encoding=%s --format=%s %s --',
	'UTF-8',
	implode(
	'%x00',
	array('%e', '%cn', '%ce', '%an', '%ae', '%T', '%s%n%n%b')),
	$this->identifier);

	$parts = explode("\0", $info);
	$encoding = array_shift($parts);

	foreach ($parts as $key => $part) {
	if ($encoding) {
	$part = phutil_utf8_convert($part, 'UTF-8', $encoding);
	}
	$parts[$key] = phutil_utf8ize($part);
	if (!strlen($parts[$key])) {
	$parts[$key] = null;
	}
	}

	$hashes = array(
	id(new DiffusionCommitHash())
	->setHashType(ArcanistDifferentialRevisionHash::HASH_GIT_COMMIT)
	->setHashValue($this->identifier),
	id(new DiffusionCommitHash())
	->setHashType(ArcanistDifferentialRevisionHash::HASH_GIT_TREE)
	->setHashValue($parts[4]),
	);

	return id(new DiffusionCommitRef())
	->setCommitterName($parts[0])
	->setCommitterEmail($parts[1])
	->setAuthorName($parts[2])
	->setAuthorEmail($parts[3])
	->setHashes($hashes)
	->setMessage($parts[5]);
	}

	private function loadMercurialCommitRef() {
	$repository = $this->getRepository();

	list($stdout) = $repository->execxLocalCommand(
	'log --template %s --rev %s',
	'{author}\\n{desc}',
	hgsprintf('%s', $this->identifier));

	list($author, $message) = explode("\n", $stdout, 2);

	$author = phutil_utf8ize($author);
	$message = phutil_utf8ize($message);

	list($author_name, $author_email) = $this->splitUserIdentifier($author);

	$hashes = array(
	id(new DiffusionCommitHash())
	->setHashType(ArcanistDifferentialRevisionHash::HASH_MERCURIAL_COMMIT)
	->setHashValue($this->identifier),
	);

	return id(new DiffusionCommitRef())
	->setAuthorName($author_name)
	->setAuthorEmail($author_email)
	->setMessage($message)
	->setHashes($hashes);
	}

	private function loadSubversionCommitRef() {
	$repository = $this->getRepository();

	list($xml) = $repository->execxRemoteCommand(
	'log --xml --limit 1 %s',
	$repository->getSubversionPathURI(null, $this->identifier));

	// Subversion may send us back commit messages which won't parse because
	// they have non UTF-8 garbage in them. Slam them into valid UTF-8.
	$xml = phutil_utf8ize($xml);
	$log = new SimpleXMLElement($xml);
	$entry = $log->logentry[0];

	$author = (string)$entry->author;
	$message = (string)$entry->msg;

	list($author_name, $author_email) = $this->splitUserIdentifier($author);

	// No hashes in Subversion.
	$hashes = array();

	return id(new DiffusionCommitRef())
	->setAuthorName($author_name)
	->setAuthorEmail($author_email)
	->setMessage($message)
	->setHashes($hashes);
	}

	private function splitUserIdentifier($user) {
	$email = new PhutilEmailAddress($user);

	if ($email->getDisplayName() \|\| $email->getDomainName()) {
	$user_name = $email->getDisplayName();
	$user_email = $email->getAddress();
	} else {
	$user_name = $email->getAddress();
	$user_email = null;
	}

	return array($user_name, $user_email);
	}

	}

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