DifferentialTransactionEditor.php
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DifferentialTransactionEditor.php
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	<?php

	final class DifferentialTransactionEditor
	extends PhabricatorApplicationTransactionEditor {

	private $changedPriorToCommitURI;
	private $isCloseByCommit;
	private $repositoryPHIDOverride = false;
	private $didExpandInlineState = false;
	private $firstBroadcast = false;
	private $wasBroadcasting;
	private $isDraftDemotion;

	private $ownersDiff;
	private $ownersChangesets;

	public function getEditorApplicationClass() {
	return PhabricatorDifferentialApplication::class;
	}

	public function getEditorObjectsDescription() {
	return pht('Differential Revisions');
	}

	public function getCreateObjectTitle($author, $object) {
	return pht('%s created this revision.', $author);
	}

	public function getCreateObjectTitleForFeed($author, $object) {
	return pht('%s created %s.', $author, $object);
	}

	public function isFirstBroadcast() {
	return $this->firstBroadcast;
	}

	public function getDiffUpdateTransaction(array $xactions) {
	$type_update = DifferentialRevisionUpdateTransaction::TRANSACTIONTYPE;

	foreach ($xactions as $xaction) {
	if ($xaction->getTransactionType() == $type_update) {
	return $xaction;
	}
	}

	return null;
	}

	public function setIsCloseByCommit($is_close_by_commit) {
	$this->isCloseByCommit = $is_close_by_commit;
	return $this;
	}

	public function getIsCloseByCommit() {
	return $this->isCloseByCommit;
	}

	public function setChangedPriorToCommitURI($uri) {
	$this->changedPriorToCommitURI = $uri;
	return $this;
	}

	public function getChangedPriorToCommitURI() {
	return $this->changedPriorToCommitURI;
	}

	public function setRepositoryPHIDOverride($phid_or_null) {
	$this->repositoryPHIDOverride = $phid_or_null;
	return $this;
	}

	public function getTransactionTypes() {
	$types = parent::getTransactionTypes();

	$types[] = PhabricatorTransactions::TYPE_COMMENT;
	$types[] = PhabricatorTransactions::TYPE_VIEW_POLICY;
	$types[] = PhabricatorTransactions::TYPE_EDIT_POLICY;
	$types[] = PhabricatorTransactions::TYPE_INLINESTATE;

	$types[] = DifferentialTransaction::TYPE_INLINE;

	return $types;
	}

	protected function getCustomTransactionOldValue(
	PhabricatorLiskDAO $object,
	PhabricatorApplicationTransaction $xaction) {

	switch ($xaction->getTransactionType()) {
	case DifferentialTransaction::TYPE_INLINE:
	return null;
	}

	return parent::getCustomTransactionOldValue($object, $xaction);
	}

	protected function getCustomTransactionNewValue(
	PhabricatorLiskDAO $object,
	PhabricatorApplicationTransaction $xaction) {

	switch ($xaction->getTransactionType()) {
	case DifferentialTransaction::TYPE_INLINE:
	return null;
	}

	return parent::getCustomTransactionNewValue($object, $xaction);
	}

	protected function applyCustomInternalTransaction(
	PhabricatorLiskDAO $object,
	PhabricatorApplicationTransaction $xaction) {

	switch ($xaction->getTransactionType()) {
	case DifferentialTransaction::TYPE_INLINE:
	$comment = $xaction->getComment();

	$comment->setAttribute('editing', false);

	PhabricatorVersionedDraft::purgeDrafts(
	$comment->getPHID(),
	$this->getActingAsPHID());
	return;
	}

	return parent::applyCustomInternalTransaction($object, $xaction);
	}

	protected function expandTransactions(
	PhabricatorLiskDAO $object,
	array $xactions) {

	foreach ($xactions as $xaction) {
	switch ($xaction->getTransactionType()) {
	case PhabricatorTransactions::TYPE_INLINESTATE:
	// If we have an "Inline State" transaction already, the caller
	// built it for us so we don't need to expand it again.
	$this->didExpandInlineState = true;
	break;
	case DifferentialRevisionPlanChangesTransaction::TRANSACTIONTYPE:
	if ($xaction->getMetadataValue('draft.demote')) {
	$this->isDraftDemotion = true;
	}
	break;
	}
	}

	$this->wasBroadcasting = $object->getShouldBroadcast();

	return parent::expandTransactions($object, $xactions);
	}

	protected function expandTransaction(
	PhabricatorLiskDAO $object,
	PhabricatorApplicationTransaction $xaction) {

	$results = parent::expandTransaction($object, $xaction);

	$actor = $this->getActor();
	$actor_phid = $this->getActingAsPHID();
	$type_edge = PhabricatorTransactions::TYPE_EDGE;

	$edge_ref_task = DifferentialRevisionHasTaskEdgeType::EDGECONST;

	$want_downgrade = array();
	$must_downgrade = array();
	if ($this->getIsCloseByCommit()) {
	// Never downgrade reviewers when we're closing a revision after a
	// commit.
	} else {
	switch ($xaction->getTransactionType()) {
	case DifferentialRevisionUpdateTransaction::TRANSACTIONTYPE:
	$want_downgrade[] = DifferentialReviewerStatus::STATUS_ACCEPTED;
	$want_downgrade[] = DifferentialReviewerStatus::STATUS_REJECTED;
	break;
	case DifferentialRevisionRequestReviewTransaction::TRANSACTIONTYPE:
	if (!$object->isChangePlanned()) {
	// If the old state isn't "Changes Planned", downgrade the accepts
	// even if they're sticky.

	// We don't downgrade for "Changes Planned" to allow an author to
	// undo a "Plan Changes" by immediately following it up with a
	// "Request Review".
	$want_downgrade[] = DifferentialReviewerStatus::STATUS_ACCEPTED;
	$must_downgrade[] = DifferentialReviewerStatus::STATUS_ACCEPTED;
	}
	$want_downgrade[] = DifferentialReviewerStatus::STATUS_REJECTED;
	break;
	}
	}

	if ($want_downgrade) {
	$void_type = DifferentialRevisionVoidTransaction::TRANSACTIONTYPE;

	$results[] = id(new DifferentialTransaction())
	->setTransactionType($void_type)
	->setIgnoreOnNoEffect(true)
	->setMetadataValue('void.force', $must_downgrade)
	->setNewValue($want_downgrade);
	}

	$new_author_phid = null;
	switch ($xaction->getTransactionType()) {
	case DifferentialRevisionUpdateTransaction::TRANSACTIONTYPE:
	if ($this->getIsCloseByCommit()) {
	// Don't bother with any of this if this update is a side effect of
	// commit detection.
	break;
	}

	// When a revision is updated and the diff comes from a branch named
	// "T123" or similar, automatically associate the commit with the
	// task that the branch names.

	$maniphest = 'PhabricatorManiphestApplication';
	if (PhabricatorApplication::isClassInstalled($maniphest)) {
	$diff = $this->requireDiff($xaction->getNewValue());
	$branch = $diff->getBranch();

	// No "$", to allow for branches like T123_demo.
	$match = null;
	if ($branch !== null && preg_match('/^T(\d+)/i', $branch, $match)) {
	$task_id = $match[1];
	$tasks = id(new ManiphestTaskQuery())
	->setViewer($this->getActor())
	->withIDs(array($task_id))
	->execute();
	if ($tasks) {
	$task = head($tasks);
	$task_phid = $task->getPHID();

	$results[] = id(new DifferentialTransaction())
	->setTransactionType($type_edge)
	->setMetadataValue('edge:type', $edge_ref_task)
	->setIgnoreOnNoEffect(true)
	->setNewValue(array('+' => array($task_phid => $task_phid)));
	}
	}
	}
	break;

	case DifferentialRevisionCommandeerTransaction::TRANSACTIONTYPE:
	$new_author_phid = $actor_phid;
	break;

	case DifferentialRevisionAuthorTransaction::TRANSACTIONTYPE:
	$new_author_phid = $xaction->getNewValue();
	break;

	}

	if ($new_author_phid) {
	$swap_xaction = $this->newSwapReviewersTransaction(
	$object,
	$new_author_phid);
	if ($swap_xaction) {
	$results[] = $swap_xaction;
	}
	}

	if (!$this->didExpandInlineState) {
	switch ($xaction->getTransactionType()) {
	case PhabricatorTransactions::TYPE_COMMENT:
	case DifferentialRevisionUpdateTransaction::TRANSACTIONTYPE:
	case DifferentialTransaction::TYPE_INLINE:
	$this->didExpandInlineState = true;

	$query_template = id(new DifferentialDiffInlineCommentQuery())
	->withRevisionPHIDs(array($object->getPHID()));

	$state_xaction = $this->newInlineStateTransaction(
	$object,
	$query_template);

	if ($state_xaction) {
	$results[] = $state_xaction;
	}
	break;
	}
	}

	return $results;
	}

	protected function applyCustomExternalTransaction(
	PhabricatorLiskDAO $object,
	PhabricatorApplicationTransaction $xaction) {

	switch ($xaction->getTransactionType()) {
	case DifferentialTransaction::TYPE_INLINE:
	$reply = $xaction->getComment()->getReplyToComment();
	if ($reply && !$reply->getHasReplies()) {
	$reply->setHasReplies(1)->save();
	}
	return;
	}

	return parent::applyCustomExternalTransaction($object, $xaction);
	}

	protected function applyBuiltinExternalTransaction(
	PhabricatorLiskDAO $object,
	PhabricatorApplicationTransaction $xaction) {

	switch ($xaction->getTransactionType()) {
	case PhabricatorTransactions::TYPE_INLINESTATE:
	$table = new DifferentialTransactionComment();
	$conn_w = $table->establishConnection('w');
	foreach ($xaction->getNewValue() as $phid => $state) {
	queryfx(
	$conn_w,
	'UPDATE %T SET fixedState = %s WHERE phid = %s',
	$table->getTableName(),
	$state,
	$phid);
	}
	break;
	}

	return parent::applyBuiltinExternalTransaction($object, $xaction);
	}

	protected function applyFinalEffects(
	PhabricatorLiskDAO $object,
	array $xactions) {

	// Load the most up-to-date version of the revision and its reviewers,
	// so we don't need to try to deduce the state of reviewers by examining
	// all the changes made by the transactions. Then, update the reviewers
	// on the object to make sure we're acting on the current reviewer set
	// (and, for example, sending mail to the right people).

	$new_revision = id(new DifferentialRevisionQuery())
	->setViewer($this->getActor())
	->needReviewers(true)
	->needActiveDiffs(true)
	->withIDs(array($object->getID()))
	->executeOne();
	if (!$new_revision) {
	throw new Exception(
	pht('Failed to load revision from transaction finalization.'));
	}

	$active_diff = $new_revision->getActiveDiff();
	$new_diff_phid = $active_diff->getPHID();

	$object->attachReviewers($new_revision->getReviewers());
	$object->attachActiveDiff($active_diff);
	$object->attachRepository($new_revision->getRepository());

	$has_new_diff = false;
	$should_index_paths = false;
	$should_index_hashes = false;
	$need_changesets = false;

	foreach ($xactions as $xaction) {
	switch ($xaction->getTransactionType()) {
	case DifferentialRevisionUpdateTransaction::TRANSACTIONTYPE:
	$need_changesets = true;

	$new_diff_phid = $xaction->getNewValue();
	$has_new_diff = true;

	$should_index_paths = true;
	$should_index_hashes = true;
	break;
	case DifferentialRevisionRepositoryTransaction::TRANSACTIONTYPE:
	// The "AffectedPath" table denormalizes the repository, so we
	// want to update the index if the repository changes.

	$need_changesets = true;

	$should_index_paths = true;
	break;
	}
	}

	if ($need_changesets) {
	$new_diff = $this->requireDiff($new_diff_phid, true);

	if ($should_index_paths) {
	id(new DifferentialAffectedPathEngine())
	->setRevision($object)
	->setDiff($new_diff)
	->updateAffectedPaths();
	}

	if ($should_index_hashes) {
	$this->updateRevisionHashTable($object, $new_diff);
	}

	if ($has_new_diff) {
	$this->ownersDiff = $new_diff;
	$this->ownersChangesets = $new_diff->getChangesets();
	}
	}

	$xactions = $this->updateReviewStatus($object, $xactions);
	$this->markReviewerComments($object, $xactions);

	return $xactions;
	}

	private function updateReviewStatus(
	DifferentialRevision $revision,
	array $xactions) {

	$was_accepted = $revision->isAccepted();
	$was_revision = $revision->isNeedsRevision();
	$was_review = $revision->isNeedsReview();
	if (!$was_accepted && !$was_revision && !$was_review) {
	// Revisions can't transition out of other statuses (like closed or
	// abandoned) as a side effect of reviewer status changes.
	return $xactions;
	}

	// Try to move a revision to "accepted". We look for:
	//
	// - at least one accepting reviewer who is a user; and
	// - no rejects; and
	// - no rejects of older diffs; and
	// - no blocking reviewers.

	$has_accepting_user = false;
	$has_rejecting_reviewer = false;
	$has_rejecting_older_reviewer = false;
	$has_blocking_reviewer = false;

	$active_diff = $revision->getActiveDiff();
	foreach ($revision->getReviewers() as $reviewer) {
	$reviewer_status = $reviewer->getReviewerStatus();
	switch ($reviewer_status) {
	case DifferentialReviewerStatus::STATUS_REJECTED:
	$active_phid = $active_diff->getPHID();
	if ($reviewer->isRejected($active_phid)) {
	$has_rejecting_reviewer = true;
	} else {
	$has_rejecting_older_reviewer = true;
	}
	break;
	case DifferentialReviewerStatus::STATUS_REJECTED_OLDER:
	$has_rejecting_older_reviewer = true;
	break;
	case DifferentialReviewerStatus::STATUS_BLOCKING:
	$has_blocking_reviewer = true;
	break;
	case DifferentialReviewerStatus::STATUS_ACCEPTED:
	if ($reviewer->isUser()) {
	$active_phid = $active_diff->getPHID();
	if ($reviewer->isAccepted($active_phid)) {
	$has_accepting_user = true;
	}
	}
	break;
	}
	}

	$new_status = null;
	if ($has_accepting_user &&
	!$has_rejecting_reviewer &&
	!$has_rejecting_older_reviewer &&
	!$has_blocking_reviewer) {
	$new_status = DifferentialRevisionStatus::ACCEPTED;
	} else if ($has_rejecting_reviewer) {
	// This isn't accepted, and there's at least one rejecting reviewer,
	// so the revision needs changes. This usually happens after a
	// "reject".
	$new_status = DifferentialRevisionStatus::NEEDS_REVISION;
	} else if ($was_accepted) {
	// This revision was accepted, but it no longer satisfies the
	// conditions for acceptance. This usually happens after an accepting
	// reviewer resigns or is removed.
	$new_status = DifferentialRevisionStatus::NEEDS_REVIEW;
	} else if ($was_revision) {
	// This revision was "Needs Revision", but no longer has any rejecting
	// reviewers. This usually happens after the last rejecting reviewer
	// resigns or is removed. Put the revision back in "Needs Review".
	$new_status = DifferentialRevisionStatus::NEEDS_REVIEW;
	}

	if ($new_status === null) {
	return $xactions;
	}

	$old_status = $revision->getModernRevisionStatus();
	if ($new_status == $old_status) {
	return $xactions;
	}

	$xaction = id(new DifferentialTransaction())
	->setTransactionType(
	DifferentialRevisionStatusTransaction::TRANSACTIONTYPE)
	->setOldValue($old_status)
	->setNewValue($new_status);

	$xaction = $this->populateTransaction($revision, $xaction)
	->save();
	$xactions[] = $xaction;

	// Save the status adjustment we made earlier.
	$revision
	->setModernRevisionStatus($new_status)
	->save();

	return $xactions;
	}

	protected function sortTransactions(array $xactions) {
	$xactions = parent::sortTransactions($xactions);

	$head = array();
	$tail = array();

	foreach ($xactions as $xaction) {
	$type = $xaction->getTransactionType();
	if ($type == DifferentialTransaction::TYPE_INLINE) {
	$tail[] = $xaction;
	} else {
	$head[] = $xaction;
	}
	}

	return array_values(array_merge($head, $tail));
	}

	protected function shouldPublishFeedStory(
	PhabricatorLiskDAO $object,
	array $xactions) {

	if (!$object->getShouldBroadcast()) {
	return false;
	}

	return true;
	}

	protected function shouldSendMail(
	PhabricatorLiskDAO $object,
	array $xactions) {
	return true;
	}

	protected function getMailTo(PhabricatorLiskDAO $object) {
	if ($object->getShouldBroadcast()) {
	$this->requireReviewers($object);

	$phids = array();
	$phids[] = $object->getAuthorPHID();
	foreach ($object->getReviewers() as $reviewer) {
	if ($reviewer->isResigned()) {
	continue;
	}

	$phids[] = $reviewer->getReviewerPHID();
	}
	return $phids;
	}

	// If we're demoting a draft after a build failure, just notify the author.
	if ($this->isDraftDemotion) {
	$author_phid = $object->getAuthorPHID();
	return array(
	$author_phid,
	);
	}

	return array();
	}

	protected function getMailCC(PhabricatorLiskDAO $object) {
	if (!$object->getShouldBroadcast()) {
	return array();
	}

	return parent::getMailCC($object);
	}

	protected function newMailUnexpandablePHIDs(PhabricatorLiskDAO $object) {
	$this->requireReviewers($object);

	$phids = array();

	foreach ($object->getReviewers() as $reviewer) {
	if ($reviewer->isResigned()) {
	$phids[] = $reviewer->getReviewerPHID();
	}
	}

	return $phids;
	}

	protected function getMailAction(
	PhabricatorLiskDAO $object,
	array $xactions) {

	$show_lines = false;
	if ($this->isFirstBroadcast()) {
	$action = pht('Request');

	$show_lines = true;
	} else {
	$action = parent::getMailAction($object, $xactions);

	$strongest = $this->getStrongestAction($object, $xactions);
	$type_update = DifferentialRevisionUpdateTransaction::TRANSACTIONTYPE;
	if ($strongest->getTransactionType() == $type_update) {
	$show_lines = true;
	}
	}

	if ($show_lines) {
	$count = new PhutilNumber($object->getLineCount());
	$action = pht('%s] [%s', $action, $object->getRevisionScaleGlyphs());
	}

	return $action;
	}

	protected function getMailSubjectPrefix() {
	return pht('[Differential]');
	}

	protected function getMailThreadID(PhabricatorLiskDAO $object) {
	// This is nonstandard, but retains threading with older messages.
	$phid = $object->getPHID();
	return "differential-rev-{$phid}-req";
	}

	protected function buildReplyHandler(PhabricatorLiskDAO $object) {
	return id(new DifferentialReplyHandler())
	->setMailReceiver($object);
	}

	protected function buildMailTemplate(PhabricatorLiskDAO $object) {
	$monogram = $object->getMonogram();
	$title = $object->getTitle();

	return id(new PhabricatorMetaMTAMail())
	->setSubject(pht('%s: %s', $monogram, $title))
	->setMustEncryptSubject(pht('%s: Revision Updated', $monogram))
	->setMustEncryptURI($object->getURI());
	}

	protected function getTransactionsForMail(
	PhabricatorLiskDAO $object,
	array $xactions) {
	// If this is the first time we're sending mail about this revision, we
	// generate mail for all prior transactions, not just whatever is being
	// applied now. This gets the "added reviewers" lines and other relevant
	// information into the mail.
	if ($this->isFirstBroadcast()) {
	return $this->loadUnbroadcastTransactions($object);
	}

	return $xactions;
	}

	protected function getObjectLinkButtonLabelForMail(
	PhabricatorLiskDAO $object) {
	return pht('View Revision');
	}

	protected function buildMailBody(
	PhabricatorLiskDAO $object,
	array $xactions) {

	$viewer = $this->requireActor();

	$body = id(new PhabricatorMetaMTAMailBody())
	->setViewer($viewer);

	$revision_uri = $this->getObjectLinkButtonURIForMail($object);
	$new_uri = $revision_uri.'/new/';

	$this->addHeadersAndCommentsToMailBody(
	$body,
	$xactions,
	$this->getObjectLinkButtonLabelForMail($object),
	$revision_uri);

	$type_inline = DifferentialTransaction::TYPE_INLINE;

	$inlines = array();
	foreach ($xactions as $xaction) {
	if ($xaction->getTransactionType() == $type_inline) {
	$inlines[] = $xaction;
	}
	}

	if ($inlines) {
	$this->appendInlineCommentsForMail($object, $inlines, $body);
	}

	$update_xaction = null;
	foreach ($xactions as $xaction) {
	switch ($xaction->getTransactionType()) {
	case DifferentialRevisionUpdateTransaction::TRANSACTIONTYPE:
	$update_xaction = $xaction;
	break;
	}
	}

	if ($update_xaction) {
	$diff = $this->requireDiff($update_xaction->getNewValue(), true);
	} else {
	$diff = null;
	}

	$changed_uri = $this->getChangedPriorToCommitURI();
	if ($changed_uri) {
	$body->addLinkSection(
	pht('CHANGED PRIOR TO COMMIT'),
	$changed_uri);
	}

	$this->addCustomFieldsToMailBody($body, $object, $xactions);

	if (!$this->isFirstBroadcast()) {
	$body->addLinkSection(pht('CHANGES SINCE LAST ACTION'), $new_uri);
	}

	$body->addLinkSection(
	pht('REVISION DETAIL'),
	$revision_uri);

	if ($update_xaction) {
	$body->addTextSection(
	pht('AFFECTED FILES'),
	$this->renderAffectedFilesForMail($diff));

	$config_key_inline = 'metamta.differential.inline-patches';
	$config_inline = PhabricatorEnv::getEnvConfig($config_key_inline);

	$config_key_attach = 'metamta.differential.attach-patches';
	$config_attach = PhabricatorEnv::getEnvConfig($config_key_attach);

	if ($config_inline \|\| $config_attach) {
	$body_limit = PhabricatorEnv::getEnvConfig('metamta.email-body-limit');

	try {
	$patch = $this->buildPatchForMail($diff, $body_limit);
	} catch (ArcanistDiffByteSizeException $ex) {
	$patch = null;
	}

	if (($patch !== null) && $config_inline) {
	$lines = substr_count($patch, "\n");
	$bytes = strlen($patch);

	// Limit the patch size to the smaller of 256 bytes per line or
	// the mail body limit. This prevents degenerate behavior for patches
	// with one line that is 10MB long. See T11748.
	$byte_limits = array();
	$byte_limits[] = (256 * $config_inline);
	$byte_limits[] = $body_limit;
	$byte_limit = min($byte_limits);

	$lines_ok = ($lines <= $config_inline);
	$bytes_ok = ($bytes <= $byte_limit);

	if ($lines_ok && $bytes_ok) {
	$this->appendChangeDetailsForMail($object, $diff, $patch, $body);
	} else {
	// TODO: Provide a helpful message about the patch being too
	// large or lengthy here.
	}
	}

	if (($patch !== null) && $config_attach) {
	// See T12033, T11767, and PHI55. This is a crude fix to stop the
	// major concrete problems that lackluster email size limits cause.
	if (strlen($patch) < $body_limit) {
	$name = pht('D%s.%s.patch', $object->getID(), $diff->getID());
	$mime_type = 'text/x-patch; charset=utf-8';
	$body->addAttachment(
	new PhabricatorMailAttachment($patch, $name, $mime_type));
	}
	}
	}
	}

	return $body;
	}

	public function getMailTagsMap() {
	return array(
	DifferentialTransaction::MAILTAG_REVIEW_REQUEST =>
	pht('A revision is created.'),
	DifferentialTransaction::MAILTAG_UPDATED =>
	pht('A revision is updated.'),
	DifferentialTransaction::MAILTAG_COMMENT =>
	pht('Someone comments on a revision.'),
	DifferentialTransaction::MAILTAG_CLOSED =>
	pht('A revision is closed.'),
	DifferentialTransaction::MAILTAG_REVIEWERS =>
	pht("A revision's reviewers change."),
	DifferentialTransaction::MAILTAG_CC =>
	pht("A revision's CCs change."),
	DifferentialTransaction::MAILTAG_OTHER =>
	pht('Other revision activity not listed above occurs.'),
	);
	}

	protected function supportsSearch() {
	return true;
	}

	protected function expandCustomRemarkupBlockTransactions(
	PhabricatorLiskDAO $object,
	array $xactions,
	array $changes,
	PhutilMarkupEngine $engine) {

	// For "Fixes ..." and "Depends on ...", we're only going to look at
	// content blocks which are part of the revision itself (like "Summary"
	// and "Test Plan"), not comments.
	$content_parts = array();
	foreach ($changes as $change) {
	if ($change->getTransaction()->isCommentTransaction()) {
	continue;
	}
	$content_parts[] = $change->getNewValue();
	}
	if (!$content_parts) {
	return array();
	}
	$content_block = implode("\n\n", $content_parts);
	$task_map = array();
	$task_refs = id(new ManiphestCustomFieldStatusParser())
	->parseCorpus($content_block);
	foreach ($task_refs as $match) {
	foreach ($match['monograms'] as $monogram) {
	$task_id = (int)trim($monogram, 'tT');
	$task_map[$task_id] = true;
	}
	}

	$rev_map = array();
	$rev_refs = id(new DifferentialCustomFieldDependsOnParser())
	->parseCorpus($content_block);
	foreach ($rev_refs as $match) {
	foreach ($match['monograms'] as $monogram) {
	$rev_id = (int)trim($monogram, 'dD');
	$rev_map[$rev_id] = true;
	}
	}

	$edges = array();
	$task_phids = array();
	$rev_phids = array();

	if ($task_map) {
	$tasks = id(new ManiphestTaskQuery())
	->setViewer($this->getActor())
	->withIDs(array_keys($task_map))
	->execute();

	if ($tasks) {
	$task_phids = mpull($tasks, 'getPHID', 'getPHID');
	$edge_related = DifferentialRevisionHasTaskEdgeType::EDGECONST;
	$edges[$edge_related] = $task_phids;
	}
	}

	if ($rev_map) {
	$revs = id(new DifferentialRevisionQuery())
	->setViewer($this->getActor())
	->withIDs(array_keys($rev_map))
	->execute();
	$rev_phids = mpull($revs, 'getPHID', 'getPHID');

	// NOTE: Skip any write attempts if a user cleverly implies a revision
	// depends upon itself.
	unset($rev_phids[$object->getPHID()]);

	if ($revs) {
	$depends = DifferentialRevisionDependsOnRevisionEdgeType::EDGECONST;
	$edges[$depends] = $rev_phids;
	}
	}

	$revert_refs = id(new DifferentialCustomFieldRevertsParser())
	->parseCorpus($content_block);

	$revert_monograms = array();
	foreach ($revert_refs as $match) {
	foreach ($match['monograms'] as $monogram) {
	$revert_monograms[] = $monogram;
	}
	}

	if ($revert_monograms) {
	$revert_objects = DiffusionCommitRevisionQuery::loadRevertedObjects(
	$this->getActor(),
	$object,
	$revert_monograms,
	null);

	$revert_phids = mpull($revert_objects, 'getPHID', 'getPHID');

	$revert_type = DiffusionCommitRevertsCommitEdgeType::EDGECONST;
	$edges[$revert_type] = $revert_phids;
	} else {
	$revert_phids = array();
	}

	$this->addUnmentionablePHIDs($task_phids);
	$this->addUnmentionablePHIDs($rev_phids);
	$this->addUnmentionablePHIDs($revert_phids);

	$result = array();
	foreach ($edges as $type => $specs) {
	$result[] = id(new DifferentialTransaction())
	->setTransactionType(PhabricatorTransactions::TYPE_EDGE)
	->setMetadataValue('edge:type', $type)
	->setNewValue(array('+' => $specs));
	}

	return $result;
	}

	private function appendInlineCommentsForMail(
	PhabricatorLiskDAO $object,
	array $inlines,
	PhabricatorMetaMTAMailBody $body) {

	$limit = 100;
	$limit_note = null;
	if (count($inlines) > $limit) {
	$limit_note = pht(
	'(Showing first %s of %s inline comments.)',
	new PhutilNumber($limit),
	phutil_count($inlines));

	$inlines = array_slice($inlines, 0, $limit, true);
	}

	$section = id(new DifferentialInlineCommentMailView())
	->setViewer($this->getActor())
	->setInlines($inlines)
	->buildMailSection();

	$header = pht('INLINE COMMENTS');

	$section_text = "\n".$section->getPlaintext();
	if ($limit_note) {
	$section_text = $limit_note."\n".$section_text;
	}

	$style = array(
	'margin: 6px 0 12px 0;',
	);

	$section_html = phutil_tag(
	'div',
	array(
	'style' => implode(' ', $style),
	),
	$section->getHTML());

	if ($limit_note) {
	$section_html = array(
	phutil_tag(
	'em',
	array(),
	$limit_note),
	$section_html,
	);
	}

	$body->addPlaintextSection($header, $section_text, false);
	$body->addHTMLSection($header, $section_html);
	}

	private function appendChangeDetailsForMail(
	PhabricatorLiskDAO $object,
	DifferentialDiff $diff,
	$patch,
	PhabricatorMetaMTAMailBody $body) {

	$section = id(new DifferentialChangeDetailMailView())
	->setViewer($this->getActor())
	->setDiff($diff)
	->setPatch($patch)
	->buildMailSection();

	$header = pht('CHANGE DETAILS');

	$section_text = "\n".$section->getPlaintext();

	$style = array(
	'margin: 6px 0 12px 0;',
	);

	$section_html = phutil_tag(
	'div',
	array(
	'style' => implode(' ', $style),
	),
	$section->getHTML());

	$body->addPlaintextSection($header, $section_text, false);
	$body->addHTMLSection($header, $section_html);
	}

	private function loadDiff($phid, $need_changesets = false) {
	$query = id(new DifferentialDiffQuery())
	->withPHIDs(array($phid))
	->setViewer($this->getActor());

	if ($need_changesets) {
	$query->needChangesets(true);
	}

	return $query->executeOne();
	}

	public function requireDiff($phid, $need_changesets = false) {
	$diff = $this->loadDiff($phid, $need_changesets);
	if (!$diff) {
	throw new Exception(pht('Diff "%s" does not exist!', $phid));
	}

	return $diff;
	}

	/* -( Herald Integration )------------------------------------------------- */

	protected function shouldApplyHeraldRules(
	PhabricatorLiskDAO $object,
	array $xactions) {
	return true;
	}

	protected function didApplyHeraldRules(
	PhabricatorLiskDAO $object,
	HeraldAdapter $adapter,
	HeraldTranscript $transcript) {

	$repository = $object->getRepository();
	if (!$repository) {
	return array();
	}

	$diff = $this->ownersDiff;
	$changesets = $this->ownersChangesets;

	$this->ownersDiff = null;
	$this->ownersChangesets = null;

	if (!$changesets) {
	return array();
	}

	$packages = PhabricatorOwnersPackage::loadAffectedPackagesForChangesets(
	$repository,
	$diff,
	$changesets);
	if (!$packages) {
	return array();
	}

	// Identify the packages with "Non-Owner Author" review rules and remove
	// them if the author has authority over the package.

	$autoreview_map = PhabricatorOwnersPackage::getAutoreviewOptionsMap();
	$need_authority = array();
	foreach ($packages as $package) {
	$autoreview_setting = $package->getAutoReview();

	$spec = idx($autoreview_map, $autoreview_setting);
	if (!$spec) {
	continue;
	}

	if (idx($spec, 'authority')) {
	$need_authority[$package->getPHID()] = $package->getPHID();
	}
	}

	if ($need_authority) {
	$authority = id(new PhabricatorOwnersPackageQuery())
	->setViewer(PhabricatorUser::getOmnipotentUser())
	->withPHIDs($need_authority)
	->withAuthorityPHIDs(array($object->getAuthorPHID()))
	->execute();
	$authority = mpull($authority, null, 'getPHID');

	foreach ($packages as $key => $package) {
	$package_phid = $package->getPHID();
	if (isset($authority[$package_phid])) {
	unset($packages[$key]);
	continue;
	}
	}

	if (!$packages) {
	return array();
	}
	}

	$auto_subscribe = array();
	$auto_review = array();
	$auto_block = array();

	foreach ($packages as $package) {
	switch ($package->getAutoReview()) {
	case PhabricatorOwnersPackage::AUTOREVIEW_REVIEW:
	case PhabricatorOwnersPackage::AUTOREVIEW_REVIEW_ALWAYS:
	$auto_review[] = $package;
	break;
	case PhabricatorOwnersPackage::AUTOREVIEW_BLOCK:
	case PhabricatorOwnersPackage::AUTOREVIEW_BLOCK_ALWAYS:
	$auto_block[] = $package;
	break;
	case PhabricatorOwnersPackage::AUTOREVIEW_SUBSCRIBE:
	case PhabricatorOwnersPackage::AUTOREVIEW_SUBSCRIBE_ALWAYS:
	$auto_subscribe[] = $package;
	break;
	case PhabricatorOwnersPackage::AUTOREVIEW_NONE:
	default:
	break;
	}
	}

	$owners_phid = id(new PhabricatorOwnersApplication())
	->getPHID();

	$xactions = array();
	if ($auto_subscribe) {
	$xactions[] = $object->getApplicationTransactionTemplate()
	->setAuthorPHID($owners_phid)
	->setTransactionType(PhabricatorTransactions::TYPE_SUBSCRIBERS)
	->setNewValue(
	array(
	'+' => mpull($auto_subscribe, 'getPHID'),
	));
	}

	$specs = array(
	array($auto_review, false),
	array($auto_block, true),
	);

	foreach ($specs as $spec) {
	list($reviewers, $blocking) = $spec;
	if (!$reviewers) {
	continue;
	}

	$phids = mpull($reviewers, 'getPHID');
	$xaction = $this->newAutoReviewTransaction($object, $phids, $blocking);
	if ($xaction) {
	$xactions[] = $xaction;
	}
	}

	return $xactions;
	}

	private function newAutoReviewTransaction(
	PhabricatorLiskDAO $object,
	array $phids,
	$is_blocking) {

	// TODO: This is substantially similar to DifferentialReviewersHeraldAction
	// and both are needlessly complex. This logic should live in the normal
	// transaction application pipeline. See T10967.

	$reviewers = $object->getReviewers();
	$reviewers = mpull($reviewers, null, 'getReviewerPHID');

	if ($is_blocking) {
	$new_status = DifferentialReviewerStatus::STATUS_BLOCKING;
	} else {
	$new_status = DifferentialReviewerStatus::STATUS_ADDED;
	}

	$new_strength = DifferentialReviewerStatus::getStatusStrength(
	$new_status);

	$current = array();
	foreach ($phids as $phid) {
	if (!isset($reviewers[$phid])) {
	continue;
	}

	// If we're applying a stronger status (usually, upgrading a reviewer
	// into a blocking reviewer), skip this check so we apply the change.
	$old_strength = DifferentialReviewerStatus::getStatusStrength(
	$reviewers[$phid]->getReviewerStatus());
	if ($old_strength <= $new_strength) {
	continue;
	}

	$current[] = $phid;
	}

	$phids = array_diff($phids, $current);

	if (!$phids) {
	return null;
	}

	$phids = array_fuse($phids);

	$value = array();
	foreach ($phids as $phid) {
	if ($is_blocking) {
	$value[] = 'blocking('.$phid.')';
	} else {
	$value[] = $phid;
	}
	}

	$owners_phid = id(new PhabricatorOwnersApplication())
	->getPHID();

	$reviewers_type = DifferentialRevisionReviewersTransaction::TRANSACTIONTYPE;

	return $object->getApplicationTransactionTemplate()
	->setAuthorPHID($owners_phid)
	->setTransactionType($reviewers_type)
	->setNewValue(
	array(
	'+' => $value,
	));
	}

	protected function buildHeraldAdapter(
	PhabricatorLiskDAO $object,
	array $xactions) {

	$revision = id(new DifferentialRevisionQuery())
	->setViewer($this->getActor())
	->withPHIDs(array($object->getPHID()))
	->needActiveDiffs(true)
	->needReviewers(true)
	->executeOne();
	if (!$revision) {
	throw new Exception(
	pht('Failed to load revision for Herald adapter construction!'));
	}

	$adapter = HeraldDifferentialRevisionAdapter::newLegacyAdapter(
	$revision,
	$revision->getActiveDiff());

	// If the object is still a draft, prevent "Send me an email" and other
	// similar rules from acting yet.
	if (!$object->getShouldBroadcast()) {
	$adapter->setForbiddenAction(
	HeraldMailableState::STATECONST,
	DifferentialHeraldStateReasons::REASON_DRAFT);
	}

	// If this edit didn't actually change the diff (for example, a user
	// edited the title or changed subscribers), prevent "Run build plan"
	// and other similar rules from acting yet, since the build results will
	// not (or, at least, should not) change unless the actual source changes.
	// We also don't run Differential builds if the update was caused by
	// discovering a commit, as the expectation is that Diffusion builds take
	// over once things land.
	$has_update = false;
	$has_commit = false;

	$type_update = DifferentialRevisionUpdateTransaction::TRANSACTIONTYPE;
	foreach ($xactions as $xaction) {
	if ($xaction->getTransactionType() != $type_update) {
	continue;
	}

	if ($xaction->getMetadataValue('isCommitUpdate')) {
	$has_commit = true;
	} else {
	$has_update = true;
	}

	break;
	}

	if ($has_commit) {
	$adapter->setForbiddenAction(
	HeraldBuildableState::STATECONST,
	DifferentialHeraldStateReasons::REASON_LANDED);
	} else if (!$has_update) {
	$adapter->setForbiddenAction(
	HeraldBuildableState::STATECONST,
	DifferentialHeraldStateReasons::REASON_UNCHANGED);
	}

	return $adapter;
	}

	/**
	* Update the table connecting revisions to DVCS local hashes, so we can
	* identify revisions by commit/tree hashes.
	*/
	private function updateRevisionHashTable(
	DifferentialRevision $revision,
	DifferentialDiff $diff) {

	$vcs = $diff->getSourceControlSystem();
	if ($vcs == DifferentialRevisionControlSystem::SVN) {
	// Subversion has no local commit or tree hash information, so we don't
	// have to do anything.
	return;
	}

	$property = id(new DifferentialDiffProperty())->loadOneWhere(
	'diffID = %d AND name = %s',
	$diff->getID(),
	'local:commits');
	if (!$property) {
	return;
	}

	$hashes = array();

	$data = $property->getData();
	switch ($vcs) {
	case DifferentialRevisionControlSystem::GIT:
	foreach ($data as $commit) {
	$hashes[] = array(
	ArcanistDifferentialRevisionHash::HASH_GIT_COMMIT,
	$commit['commit'],
	);
	$hashes[] = array(
	ArcanistDifferentialRevisionHash::HASH_GIT_TREE,
	$commit['tree'],
	);
	}
	break;
	case DifferentialRevisionControlSystem::MERCURIAL:
	foreach ($data as $commit) {
	$hashes[] = array(
	ArcanistDifferentialRevisionHash::HASH_MERCURIAL_COMMIT,
	$commit['rev'],
	);
	}
	break;
	}

	$conn_w = $revision->establishConnection('w');

	$sql = array();
	foreach ($hashes as $info) {
	list($type, $hash) = $info;
	$sql[] = qsprintf(
	$conn_w,
	'(%d, %s, %s)',
	$revision->getID(),
	$type,
	$hash);
	}

	queryfx(
	$conn_w,
	'DELETE FROM %T WHERE revisionID = %d',
	ArcanistDifferentialRevisionHash::TABLE_NAME,
	$revision->getID());

	if ($sql) {
	queryfx(
	$conn_w,
	'INSERT INTO %T (revisionID, type, hash) VALUES %LQ',
	ArcanistDifferentialRevisionHash::TABLE_NAME,
	$sql);
	}
	}

	private function renderAffectedFilesForMail(DifferentialDiff $diff) {
	$changesets = $diff->getChangesets();

	$filenames = mpull($changesets, 'getDisplayFilename');
	sort($filenames);

	$count = count($filenames);
	$max = 250;
	if ($count > $max) {
	$filenames = array_slice($filenames, 0, $max);
	$filenames[] = pht('(%d more files...)', ($count - $max));
	}

	return implode("\n", $filenames);
	}

	private function renderPatchHTMLForMail($patch) {
	return phutil_tag('pre',
	array('style' => 'font-family: monospace;'), $patch);
	}

	private function buildPatchForMail(DifferentialDiff $diff, $byte_limit) {
	$format = PhabricatorEnv::getEnvConfig('metamta.differential.patch-format');

	return id(new DifferentialRawDiffRenderer())
	->setViewer($this->getActor())
	->setFormat($format)
	->setChangesets($diff->getChangesets())
	->setByteLimit($byte_limit)
	->buildPatch();
	}

	protected function willPublish(PhabricatorLiskDAO $object, array $xactions) {
	// Reload to pick up the active diff and reviewer status.
	return id(new DifferentialRevisionQuery())
	->setViewer($this->getActor())
	->needReviewers(true)
	->needActiveDiffs(true)
	->withIDs(array($object->getID()))
	->executeOne();
	}

	protected function getCustomWorkerState() {
	return array(
	'changedPriorToCommitURI' => $this->changedPriorToCommitURI,
	'firstBroadcast' => $this->firstBroadcast,
	'isDraftDemotion' => $this->isDraftDemotion,
	);
	}

	protected function loadCustomWorkerState(array $state) {
	$this->changedPriorToCommitURI = idx($state, 'changedPriorToCommitURI');
	$this->firstBroadcast = idx($state, 'firstBroadcast');
	$this->isDraftDemotion = idx($state, 'isDraftDemotion');
	return $this;
	}

	private function newSwapReviewersTransaction(
	DifferentialRevision $revision,
	$new_author_phid) {

	$old_author_phid = $revision->getAuthorPHID();

	if ($old_author_phid === $new_author_phid) {
	return;
	}

	// If the revision is changing authorship, add the previous author as a
	// reviewer and remove the new author.

	$edits = array(
	'-' => array(
	$new_author_phid,
	),
	'+' => array(
	$old_author_phid,
	),
	);

	// NOTE: We're setting setIsCommandeerSideEffect() on this because normally
	// you can't add a revision's author as a reviewer, but this action swaps
	// them after validation executes.

	$xaction_type = DifferentialRevisionReviewersTransaction::TRANSACTIONTYPE;

	return id(new DifferentialTransaction())
	->setTransactionType($xaction_type)
	->setIgnoreOnNoEffect(true)
	->setIsCommandeerSideEffect(true)
	->setNewValue($edits);
	}


	public function getActiveDiff($object) {
	if ($this->getIsNewObject()) {
	return null;
	} else {
	return $object->getActiveDiff();
	}
	}

	/**
	* When a reviewer makes a comment, mark the last revision they commented
	* on.
	*
	* This allows us to show a hint to help authors and other reviewers quickly
	* distinguish between reviewers who have participated in the discussion and
	* reviewers who haven't been part of it.
	*/
	private function markReviewerComments($object, array $xactions) {
	$acting_phid = $this->getActingAsPHID();
	if (!$acting_phid) {
	return;
	}

	$diff = $this->getActiveDiff($object);
	if (!$diff) {
	return;
	}

	$has_comment = false;
	foreach ($xactions as $xaction) {
	if ($xaction->hasComment()) {
	$has_comment = true;
	break;
	}
	}

	if (!$has_comment) {
	return;
	}

	$reviewer_table = new DifferentialReviewer();
	$conn = $reviewer_table->establishConnection('w');

	queryfx(
	$conn,
	'UPDATE %T SET lastCommentDiffPHID = %s
	WHERE revisionPHID = %s
	AND reviewerPHID = %s',
	$reviewer_table->getTableName(),
	$diff->getPHID(),
	$object->getPHID(),
	$acting_phid);
	}

	private function loadUnbroadcastTransactions($object) {
	$viewer = $this->requireActor();

	$xactions = id(new DifferentialTransactionQuery())
	->setViewer($viewer)
	->withObjectPHIDs(array($object->getPHID()))
	->execute();

	return array_reverse($xactions);
	}


	protected function didApplyTransactions($object, array $xactions) {
	// In a moment, we're going to try to publish draft revisions which have
	// completed all their builds. However, we only want to do that if the
	// actor is either the revision author or an omnipotent user (generally,
	// the Harbormaster application).

	// If we let any actor publish the revision as a side effect of other
	// changes then an unlucky third party who innocently comments on the draft
	// can end up racing Harbormaster and promoting the revision. At best, this
	// is confusing. It can also run into validation problems with the "Request
	// Review" transaction. See PHI309 for some discussion.
	$author_phid = $object->getAuthorPHID();
	$viewer = $this->requireActor();
	$can_undraft =
	($this->getActingAsPHID() === $author_phid) \|\|
	($viewer->isOmnipotent());

	// If a draft revision has no outstanding builds and we're automatically
	// making drafts public after builds finish, make the revision public.
	if ($can_undraft) {
	$auto_undraft = !$object->getHoldAsDraft();
	} else {
	$auto_undraft = false;
	}

	$can_promote = false;
	$can_demote = false;

	// "Draft" revisions can promote to "Review Requested" after builds pass,
	// or demote to "Changes Planned" after builds fail.
	if ($object->isDraft()) {
	$can_promote = true;
	$can_demote = true;
	}

	// See PHI584. "Changes Planned" revisions which are not yet broadcasting
	// can promote to "Review Requested" if builds pass.

	// This pass is presumably the result of someone restarting the builds and
	// having them work this time, perhaps because the builds are not perfectly
	// reliable or perhaps because someone fixed some issue with build hardware
	// or some other dependency.

	// Currently, there's no legitimate way to end up in this state except
	// through automatic demotion, so this behavior should not generate an
	// undue level of confusion or ambiguity. Also note that these changes can
	// not demote again since they've already been demoted once.
	if ($object->isChangePlanned()) {
	if (!$object->getShouldBroadcast()) {
	$can_promote = true;
	}
	}

	if (($can_promote \|\| $can_demote) && $auto_undraft) {
	$status = $this->loadCompletedBuildableStatus($object);

	$is_passed = ($status === HarbormasterBuildableStatus::STATUS_PASSED);
	$is_failed = ($status === HarbormasterBuildableStatus::STATUS_FAILED);

	if ($is_passed && $can_promote) {
	// When Harbormaster moves a revision out of the draft state, we
	// attribute the action to the revision author since this is more
	// natural and more useful.

	// Additionally, we change the acting PHID for the transaction set
	// to the author if it isn't already a user so that mail comes from
	// the natural author.
	$acting_phid = $this->getActingAsPHID();
	$user_type = PhabricatorPeopleUserPHIDType::TYPECONST;
	if (phid_get_type($acting_phid) != $user_type) {
	$this->setActingAsPHID($author_phid);
	}

	$xaction = $object->getApplicationTransactionTemplate()
	->setAuthorPHID($author_phid)
	->setTransactionType(
	DifferentialRevisionRequestReviewTransaction::TRANSACTIONTYPE)
	->setNewValue(true);

	// If we're creating this revision and immediately moving it out of
	// the draft state, mark this as a create transaction so it gets
	// hidden in the timeline and mail, since it isn't interesting: it
	// is as though the draft phase never happened.
	if ($this->getIsNewObject()) {
	$xaction->setIsCreateTransaction(true);
	}

	// Queue this transaction and apply it separately after the current
	// batch of transactions finishes so that Herald can fire on the new
	// revision state. See T13027 for discussion.
	$this->queueTransaction($xaction);
	} else if ($is_failed && $can_demote) {
	// When demoting a revision, we act as "Harbormaster" instead of
	// the author since this feels a little more natural.
	$harbormaster_phid = id(new PhabricatorHarbormasterApplication())
	->getPHID();

	$xaction = $object->getApplicationTransactionTemplate()
	->setAuthorPHID($harbormaster_phid)
	->setMetadataValue('draft.demote', true)
	->setTransactionType(
	DifferentialRevisionPlanChangesTransaction::TRANSACTIONTYPE)
	->setNewValue(true);

	$this->queueTransaction($xaction);
	}
	}

	// If the revision is new or was a draft, and is no longer a draft, we
	// might be sending the first email about it.

	// This might mean it was created directly into a non-draft state, or
	// it just automatically undrafted after builds finished, or a user
	// explicitly promoted it out of the draft state with an action like
	// "Request Review".

	// If we haven't sent any email about it yet, mark this email as the first
	// email so the mail gets enriched with "SUMMARY" and "TEST PLAN".

	$is_new = $this->getIsNewObject();
	$was_broadcasting = $this->wasBroadcasting;

	if ($object->getShouldBroadcast()) {
	if (!$was_broadcasting \|\| $is_new) {
	// Mark this as the first broadcast we're sending about the revision
	// so mail can generate specially.
	$this->firstBroadcast = true;
	}
	}

	return $xactions;
	}

	private function loadCompletedBuildableStatus(
	DifferentialRevision $revision) {
	$viewer = $this->requireActor();
	$builds = $revision->loadImpactfulBuilds($viewer);
	return $revision->newBuildableStatusForBuilds($builds);
	}

	private function requireReviewers(DifferentialRevision $revision) {
	if ($revision->hasAttachedReviewers()) {
	return;
	}

	$with_reviewers = id(new DifferentialRevisionQuery())
	->setViewer($this->getActor())
	->needReviewers(true)
	->withPHIDs(array($revision->getPHID()))
	->executeOne();
	if (!$with_reviewers) {
	throw new Exception(
	pht(
	'Failed to reload revision ("%s").',
	$revision->getPHID()));
	}

	$revision->attachReviewers($with_reviewers->getReviewers());
	}


	}

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