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	diff --git a/src/applications/differential/controller/DifferentialRevisionViewController.php b/src/applications/differential/controller/DifferentialRevisionViewController.php
	index 2bec0f6886..b7157a72b0 100644
	--- a/src/applications/differential/controller/DifferentialRevisionViewController.php
	+++ b/src/applications/differential/controller/DifferentialRevisionViewController.php
	@@ -1,944 +1,948 @@
	<?php

	final class DifferentialRevisionViewController extends DifferentialController {

	private $revisionID;

	public function shouldAllowPublic() {
	return true;
	}

	public function willProcessRequest(array $data) {
	$this->revisionID = $data['id'];
	}

	public function processRequest() {

	$request = $this->getRequest();
	$user = $request->getUser();
	$viewer_is_anonymous = !$user->isLoggedIn();

	$revision = id(new DifferentialRevisionQuery())
	->withIDs(array($this->revisionID))
	->setViewer($request->getUser())
	->needRelationships(true)
	->needReviewerStatus(true)
	->needReviewerAuthority(true)
	->executeOne();

	if (!$revision) {
	return new Aphront404Response();
	}

	$diffs = id(new DifferentialDiffQuery())
	->setViewer($request->getUser())
	->withRevisionIDs(array($this->revisionID))
	->execute();
	$diffs = array_reverse($diffs, $preserve_keys = true);

	if (!$diffs) {
	throw new Exception(
	"This revision has no diffs. Something has gone quite wrong.");
	}

	$diff_vs = $request->getInt('vs');

	$target_id = $request->getInt('id');
	$target = idx($diffs, $target_id, end($diffs));

	$target_manual = $target;
	if (!$target_id) {
	foreach ($diffs as $diff) {
	if ($diff->getCreationMethod() != 'commit') {
	$target_manual = $diff;
	}
	}
	}

	if (empty($diffs[$diff_vs])) {
	$diff_vs = null;
	}

	$arc_project = $target->loadArcanistProject();
	$repository = ($arc_project ? $arc_project->loadRepository() : null);

	list($changesets, $vs_map, $vs_changesets, $rendering_references) =
	$this->loadChangesetsAndVsMap(
	$target,
	idx($diffs, $diff_vs),
	$repository);

	if ($request->getExists('download')) {
	return $this->buildRawDiffResponse(
	$revision,
	$changesets,
	$vs_changesets,
	$vs_map,
	$repository);
	}

	$props = id(new DifferentialDiffProperty())->loadAllWhere(
	'diffID = %d',
	$target_manual->getID());
	$props = mpull($props, 'getData', 'getName');

	$aux_fields = $this->loadAuxiliaryFields($revision);

	$comments = $revision->loadComments();

	$all_changesets = $changesets;
	$inlines = $this->loadInlineComments(
	$revision,
	$all_changesets);

	$object_phids = array_merge(
	$revision->getReviewers(),
	$revision->getCCPHIDs(),
	$revision->loadCommitPHIDs(),
	array(
	$revision->getAuthorPHID(),
	$user->getPHID(),
	),
	mpull($comments, 'getAuthorPHID'));

	foreach ($comments as $comment) {
	foreach ($comment->getRequiredHandlePHIDs() as $phid) {
	$object_phids[] = $phid;
	}
	}

	foreach ($revision->getAttached() as $type => $phids) {
	foreach ($phids as $phid => $info) {
	$object_phids[] = $phid;
	}
	}

	$aux_phids = array();
	foreach ($aux_fields as $key => $aux_field) {
	$aux_field->setDiff($target);
	$aux_field->setManualDiff($target_manual);
	$aux_field->setDiffProperties($props);
	$aux_phids[$key] = $aux_field->getRequiredHandlePHIDsForRevisionView();
	}
	$object_phids = array_merge($object_phids, array_mergev($aux_phids));
	$object_phids = array_unique($object_phids);

	$handles = $this->loadViewerHandles($object_phids);

	foreach ($aux_fields as $key => $aux_field) {
	// Make sure each field only has access to handles it specifically
	// requested, not all handles. Otherwise you can get a field which works
	// only in the presence of other fields.
	$aux_field->setHandles(array_select_keys($handles, $aux_phids[$key]));
	}

	- $reviewer_warning = null;
	- if ($revision->getStatus() ==
	- ArcanistDifferentialRevisionStatus::NEEDS_REVIEW) {
	- $has_live_reviewer = false;
	- foreach ($revision->getReviewers() as $reviewer) {
	- if (!$handles[$reviewer]->isDisabled()) {
	- $has_live_reviewer = true;
	- break;
	- }
	- }
	- if (!$has_live_reviewer) {
	- $reviewer_warning = new AphrontErrorView();
	- $reviewer_warning->setSeverity(AphrontErrorView::SEVERITY_WARNING);
	- $reviewer_warning->setTitle(pht('No Active Reviewers'));
	- if ($revision->getReviewers()) {
	- $reviewer_warning->appendChild(
	- phutil_tag(
	- 'p',
	- array(),
	- pht('All specified reviewers are disabled and this revision '.
	- 'needs review. You may want to add some new reviewers.')));
	- } else {
	- $reviewer_warning->appendChild(
	- phutil_tag(
	- 'p',
	- array(),
	- pht('This revision has no specified reviewers and needs '.
	- 'review. You may want to add some reviewers.')));
	- }
	- }
	- }
	-
	$request_uri = $request->getRequestURI();

	$limit = 100;
	$large = $request->getStr('large');
	if (count($changesets) > $limit && !$large) {
	$count = count($changesets);
	$warning = new AphrontErrorView();
	$warning->setTitle('Very Large Diff');
	$warning->setSeverity(AphrontErrorView::SEVERITY_WARNING);
	$warning->appendChild(hsprintf(
	'%s <strong>%s</strong>',
	pht(
	'This diff is very large and affects %s files. Load each file '.
	'individually.',
	new PhutilNumber($count)),
	phutil_tag(
	'a',
	array(
	'href' => $request_uri
	->alter('large', 'true')
	->setFragment('toc'),
	),
	pht('Show All Files Inline'))));
	$warning = $warning->render();

	$my_inlines = id(new DifferentialInlineCommentQuery())
	->withDraftComments($user->getPHID(), $this->revisionID)
	->execute();

	$visible_changesets = array();
	foreach ($inlines + $my_inlines as $inline) {
	$changeset_id = $inline->getChangesetID();
	if (isset($changesets[$changeset_id])) {
	$visible_changesets[$changeset_id] = $changesets[$changeset_id];
	}
	}

	if (!empty($props['arc:lint'])) {
	$changeset_paths = mpull($changesets, null, 'getFilename');
	foreach ($props['arc:lint'] as $lint) {
	$changeset = idx($changeset_paths, $lint['path']);
	if ($changeset) {
	$visible_changesets[$changeset->getID()] = $changeset;
	}
	}
	}

	} else {
	$warning = null;
	$visible_changesets = $changesets;
	}

	$revision_detail = id(new DifferentialRevisionDetailView())
	->setUser($user)
	->setRevision($revision)
	->setDiff(end($diffs))
	->setAuxiliaryFields($aux_fields)
	->setURI($request->getRequestURI());

	$actions = $this->getRevisionActions($revision);

	$custom_renderer_class = PhabricatorEnv::getEnvConfig(
	'differential.revision-custom-detail-renderer');
	if ($custom_renderer_class) {

	// TODO: build a better version of the action links and deprecate the
	// whole DifferentialRevisionDetailRenderer class.
	$custom_renderer = newv($custom_renderer_class, array());
	$custom_renderer->setUser($user);
	$custom_renderer->setDiff($target);
	if ($diff_vs) {
	$custom_renderer->setVSDiff($diffs[$diff_vs]);
	}
	$actions = array_merge(
	$actions,
	$custom_renderer->generateActionLinks($revision, $target_manual));
	}

	$whitespace = $request->getStr(
	'whitespace',
	DifferentialChangesetParser::WHITESPACE_IGNORE_ALL);

	if ($arc_project) {
	list($symbol_indexes, $project_phids) = $this->buildSymbolIndexes(
	$arc_project,
	$visible_changesets);
	} else {
	$symbol_indexes = array();
	$project_phids = null;
	}

	$revision_detail->setActions($actions);
	$revision_detail->setUser($user);

	+ $revision_detail_box = $revision_detail->render();
	+
	+ $revision_warnings = $this->buildRevisionWarnings($revision, $handles);
	+ if ($revision_warnings) {
	+ $revision_detail_box->setErrorView($revision_warnings);
	+ }
	+
	$comment_view = $this->buildTransactions(
	$revision,
	$diff_vs ? $diffs[$diff_vs] : $target,
	$target,
	$all_changesets);

	$wrap_id = celerity_generate_unique_node_id();
	$comment_view = phutil_tag(
	'div',
	array(
	'id' => $wrap_id,
	),
	$comment_view);

	if ($arc_project) {
	Javelin::initBehavior(
	'repository-crossreference',
	array(
	'section' => $wrap_id,
	'projects' => $project_phids,
	));
	}

	$changeset_view = new DifferentialChangesetListView();
	$changeset_view->setChangesets($changesets);
	$changeset_view->setVisibleChangesets($visible_changesets);

	if (!$viewer_is_anonymous) {
	$changeset_view->setInlineCommentControllerURI(
	'/differential/comment/inline/edit/'.$revision->getID().'/');
	}

	$changeset_view->setStandaloneURI('/differential/changeset/');
	$changeset_view->setRawFileURIs(
	'/differential/changeset/?view=old',
	'/differential/changeset/?view=new');

	$changeset_view->setUser($user);
	$changeset_view->setDiff($target);
	$changeset_view->setRenderingReferences($rendering_references);
	$changeset_view->setVsMap($vs_map);
	$changeset_view->setWhitespace($whitespace);
	if ($repository) {
	$changeset_view->setRepository($repository);
	}
	$changeset_view->setSymbolIndexes($symbol_indexes);
	$changeset_view->setTitle('Diff '.$target->getID());

	$diff_history = new DifferentialRevisionUpdateHistoryView();
	$diff_history->setDiffs($diffs);
	$diff_history->setSelectedVersusDiffID($diff_vs);
	$diff_history->setSelectedDiffID($target->getID());
	$diff_history->setSelectedWhitespace($whitespace);
	$diff_history->setUser($user);

	$local_view = new DifferentialLocalCommitsView();
	$local_view->setUser($user);
	$local_view->setLocalCommits(idx($props, 'local:commits'));

	if ($repository) {
	$other_revisions = $this->loadOtherRevisions(
	$changesets,
	$target,
	$repository);
	} else {
	$other_revisions = array();
	}

	$other_view = null;
	if ($other_revisions) {
	$other_view = $this->renderOtherRevisions($other_revisions);
	}

	$toc_view = new DifferentialDiffTableOfContentsView();
	$toc_view->setChangesets($changesets);
	$toc_view->setVisibleChangesets($visible_changesets);
	$toc_view->setRenderingReferences($rendering_references);
	$toc_view->setUnitTestData(idx($props, 'arc:unit', array()));
	if ($repository) {
	$toc_view->setRepository($repository);
	}
	$toc_view->setDiff($target);
	$toc_view->setUser($user);
	$toc_view->setRevisionID($revision->getID());
	$toc_view->setWhitespace($whitespace);

	$comment_form = null;
	if (!$viewer_is_anonymous) {
	$draft = id(new PhabricatorDraft())->loadOneWhere(
	'authorPHID = %s AND draftKey = %s',
	$user->getPHID(),
	'differential-comment-'.$revision->getID());

	$reviewers = array();
	$ccs = array();
	if ($draft) {
	$reviewers = idx($draft->getMetadata(), 'reviewers', array());
	$ccs = idx($draft->getMetadata(), 'ccs', array());
	if ($reviewers \|\| $ccs) {
	$handles = $this->loadViewerHandles(array_merge($reviewers, $ccs));
	$reviewers = array_select_keys($handles, $reviewers);
	$ccs = array_select_keys($handles, $ccs);
	}
	}

	$comment_form = new DifferentialAddCommentView();
	$comment_form->setRevision($revision);
	$comment_form->setAuxFields($aux_fields);
	$comment_form->setActions($this->getRevisionCommentActions($revision));
	$comment_form->setActionURI('/differential/comment/save/');
	$comment_form->setUser($user);
	$comment_form->setDraft($draft);
	$comment_form->setReviewers(mpull($reviewers, 'getFullName', 'getPHID'));
	$comment_form->setCCs(mpull($ccs, 'getFullName', 'getPHID'));

	// TODO: This just makes the "Z" key work. Generalize this and remove
	// it at some point.
	$comment_form = phutil_tag(
	'div',
	array(
	'class' => 'differential-add-comment-panel',
	),
	$comment_form);
	}

	$pane_id = celerity_generate_unique_node_id();
	Javelin::initBehavior(
	'differential-keyboard-navigation',
	array(
	'haunt' => $pane_id,
	));
	Javelin::initBehavior('differential-user-select');

	$page_pane = id(new DifferentialPrimaryPaneView())
	->setID($pane_id)
	->appendChild(array(
	$comment_view,
	$diff_history,
	$warning,
	$local_view,
	$toc_view,
	$other_view,
	$changeset_view,
	));
	if ($comment_form) {
	$page_pane->appendChild($comment_form);
	} else {
	// TODO: For now, just use this to get "Login to Comment".
	$page_pane->appendChild(
	id(new PhabricatorApplicationTransactionCommentView())
	->setUser($user)
	->setRequestURI($request->getRequestURI()));
	}


	$object_id = 'D'.$revision->getID();

	$top_anchor = id(new PhabricatorAnchorView())
	->setAnchorName('top')
	->setNavigationMarker(true);

	$content = array(
	- $reviewer_warning,
	$top_anchor,
	- $revision_detail,
	+ $revision_detail_box,
	$page_pane,
	);

	$crumbs = $this->buildApplicationCrumbs();
	$crumbs->addTextCrumb($object_id, '/'.$object_id);

	$prefs = $user->loadPreferences();

	$pref_filetree = PhabricatorUserPreferences::PREFERENCE_DIFF_FILETREE;
	if ($prefs->getPreference($pref_filetree)) {
	$collapsed = $prefs->getPreference(
	PhabricatorUserPreferences::PREFERENCE_NAV_COLLAPSED,
	false);

	$nav = id(new DifferentialChangesetFileTreeSideNavBuilder())
	->setAnchorName('top')
	->setTitle('D'.$revision->getID())
	->setBaseURI(new PhutilURI('/D'.$revision->getID()))
	->setCollapsed((bool)$collapsed)
	->build($changesets);
	$nav->appendChild($content);
	$nav->setCrumbs($crumbs);
	$content = $nav;
	} else {
	array_unshift($content, $crumbs);
	}

	return $this->buildApplicationPage(
	$content,
	array(
	'title' => $object_id.' '.$revision->getTitle(),
	'pageObjects' => array($revision->getPHID()),
	));
	}

	private function getRevisionActions(DifferentialRevision $revision) {
	$viewer = $this->getRequest()->getUser();
	$revision_id = $revision->getID();
	$revision_phid = $revision->getPHID();

	$can_edit = PhabricatorPolicyFilter::hasCapability(
	$viewer,
	$revision,
	PhabricatorPolicyCapability::CAN_EDIT);

	$links = array();

	$links[] = array(
	'icon' => 'edit',
	'href' => "/differential/revision/edit/{$revision_id}/",
	'name' => pht('Edit Revision'),
	'disabled' => !$can_edit,
	'sigil' => $can_edit ? null : 'workflow',
	);

	$this->requireResource('phabricator-object-selector-css');
	$this->requireResource('javelin-behavior-phabricator-object-selector');

	$links[] = array(
	'icon' => 'link',
	'name' => pht('Edit Dependencies'),
	'href' => "/search/attach/{$revision_phid}/DREV/dependencies/",
	'sigil' => 'workflow',
	'disabled' => !$can_edit,
	);

	$maniphest = 'PhabricatorApplicationManiphest';
	if (PhabricatorApplication::isClassInstalled($maniphest)) {
	$links[] = array(
	'icon' => 'attach',
	'name' => pht('Edit Maniphest Tasks'),
	'href' => "/search/attach/{$revision_phid}/TASK/",
	'sigil' => 'workflow',
	'disabled' => !$can_edit,
	);
	}

	$request_uri = $this->getRequest()->getRequestURI();
	$links[] = array(
	'icon' => 'download',
	'name' => pht('Download Raw Diff'),
	'href' => $request_uri->alter('download', 'true')
	);

	return $links;
	}

	private function getRevisionCommentActions(DifferentialRevision $revision) {

	$actions = array(
	DifferentialAction::ACTION_COMMENT => true,
	);

	$viewer = $this->getRequest()->getUser();
	$viewer_phid = $viewer->getPHID();
	$viewer_is_owner = ($viewer_phid == $revision->getAuthorPHID());
	$viewer_is_reviewer = in_array($viewer_phid, $revision->getReviewers());
	$status = $revision->getStatus();

	$viewer_has_accepted = false;
	$viewer_has_rejected = false;
	$status_accepted = DifferentialReviewerStatus::STATUS_ACCEPTED;
	$status_rejected = DifferentialReviewerStatus::STATUS_REJECTED;
	foreach ($revision->getReviewerStatus() as $reviewer) {
	if ($reviewer->getReviewerPHID() == $viewer_phid) {
	if ($reviewer->getStatus() == $status_accepted) {
	$viewer_has_accepted = true;
	}
	if ($reviewer->getStatus() == $status_rejected) {
	$viewer_has_rejected = true;
	}
	break;
	}
	}

	$allow_self_accept = PhabricatorEnv::getEnvConfig(
	'differential.allow-self-accept');
	$always_allow_close = PhabricatorEnv::getEnvConfig(
	'differential.always-allow-close');
	$allow_reopen = PhabricatorEnv::getEnvConfig(
	'differential.allow-reopen');

	if ($viewer_is_owner) {
	switch ($status) {
	case ArcanistDifferentialRevisionStatus::NEEDS_REVIEW:
	$actions[DifferentialAction::ACTION_ACCEPT] = $allow_self_accept;
	$actions[DifferentialAction::ACTION_ABANDON] = true;
	$actions[DifferentialAction::ACTION_RETHINK] = true;
	break;
	case ArcanistDifferentialRevisionStatus::NEEDS_REVISION:
	$actions[DifferentialAction::ACTION_ACCEPT] = $allow_self_accept;
	$actions[DifferentialAction::ACTION_ABANDON] = true;
	$actions[DifferentialAction::ACTION_REQUEST] = true;
	break;
	case ArcanistDifferentialRevisionStatus::ACCEPTED:
	$actions[DifferentialAction::ACTION_ABANDON] = true;
	$actions[DifferentialAction::ACTION_REQUEST] = true;
	$actions[DifferentialAction::ACTION_RETHINK] = true;
	$actions[DifferentialAction::ACTION_CLOSE] = true;
	break;
	case ArcanistDifferentialRevisionStatus::CLOSED:
	break;
	case ArcanistDifferentialRevisionStatus::ABANDONED:
	$actions[DifferentialAction::ACTION_RECLAIM] = true;
	break;
	}
	} else {
	switch ($status) {
	case ArcanistDifferentialRevisionStatus::NEEDS_REVIEW:
	$actions[DifferentialAction::ACTION_ACCEPT] = true;
	$actions[DifferentialAction::ACTION_REJECT] = true;
	$actions[DifferentialAction::ACTION_RESIGN] = $viewer_is_reviewer;
	break;
	case ArcanistDifferentialRevisionStatus::NEEDS_REVISION:
	$actions[DifferentialAction::ACTION_ACCEPT] = true;
	$actions[DifferentialAction::ACTION_REJECT] = !$viewer_has_rejected;
	$actions[DifferentialAction::ACTION_RESIGN] = $viewer_is_reviewer;
	break;
	case ArcanistDifferentialRevisionStatus::ACCEPTED:
	$actions[DifferentialAction::ACTION_ACCEPT] = !$viewer_has_accepted;
	$actions[DifferentialAction::ACTION_REJECT] = true;
	$actions[DifferentialAction::ACTION_RESIGN] = $viewer_is_reviewer;
	break;
	case ArcanistDifferentialRevisionStatus::CLOSED:
	case ArcanistDifferentialRevisionStatus::ABANDONED:
	break;
	}
	if ($status != ArcanistDifferentialRevisionStatus::CLOSED) {
	$actions[DifferentialAction::ACTION_CLAIM] = true;
	$actions[DifferentialAction::ACTION_CLOSE] = $always_allow_close;
	}
	}

	$actions[DifferentialAction::ACTION_ADDREVIEWERS] = true;
	$actions[DifferentialAction::ACTION_ADDCCS] = true;
	$actions[DifferentialAction::ACTION_REOPEN] = $allow_reopen &&
	($status == ArcanistDifferentialRevisionStatus::CLOSED);

	$actions = array_keys(array_filter($actions));
	$actions_dict = array();
	foreach ($actions as $action) {
	$actions_dict[$action] = DifferentialAction::getActionVerb($action);
	}

	return $actions_dict;
	}

	private function loadInlineComments(
	DifferentialRevision $revision,
	array &$changesets) {
	assert_instances_of($changesets, 'DifferentialChangeset');

	$inline_comments = array();

	$inline_comments = id(new DifferentialInlineCommentQuery())
	->withRevisionIDs(array($revision->getID()))
	->withNotDraft(true)
	->execute();

	$load_changesets = array();
	foreach ($inline_comments as $inline) {
	$changeset_id = $inline->getChangesetID();
	if (isset($changesets[$changeset_id])) {
	continue;
	}
	$load_changesets[$changeset_id] = true;
	}

	$more_changesets = array();
	if ($load_changesets) {
	$changeset_ids = array_keys($load_changesets);
	$more_changesets += id(new DifferentialChangeset())
	->loadAllWhere(
	'id IN (%Ld)',
	$changeset_ids);
	}

	if ($more_changesets) {
	$changesets += $more_changesets;
	$changesets = msort($changesets, 'getSortKey');
	}

	return $inline_comments;
	}

	private function loadChangesetsAndVsMap(
	DifferentialDiff $target,
	DifferentialDiff $diff_vs = null,
	PhabricatorRepository $repository = null) {

	$load_ids = array();
	if ($diff_vs) {
	$load_ids[] = $diff_vs->getID();
	}
	$load_ids[] = $target->getID();

	$raw_changesets = id(new DifferentialChangeset())
	->loadAllWhere(
	'diffID IN (%Ld)',
	$load_ids);
	$changeset_groups = mgroup($raw_changesets, 'getDiffID');

	$changesets = idx($changeset_groups, $target->getID(), array());
	$changesets = mpull($changesets, null, 'getID');

	$refs = array();
	$vs_map = array();
	$vs_changesets = array();
	if ($diff_vs) {
	$vs_id = $diff_vs->getID();
	$vs_changesets_path_map = array();
	foreach (idx($changeset_groups, $vs_id, array()) as $changeset) {
	$path = $changeset->getAbsoluteRepositoryPath($repository, $diff_vs);
	$vs_changesets_path_map[$path] = $changeset;
	$vs_changesets[$changeset->getID()] = $changeset;
	}
	foreach ($changesets as $key => $changeset) {
	$path = $changeset->getAbsoluteRepositoryPath($repository, $target);
	if (isset($vs_changesets_path_map[$path])) {
	$vs_map[$changeset->getID()] =
	$vs_changesets_path_map[$path]->getID();
	$refs[$changeset->getID()] =
	$changeset->getID().'/'.$vs_changesets_path_map[$path]->getID();
	unset($vs_changesets_path_map[$path]);
	} else {
	$refs[$changeset->getID()] = $changeset->getID();
	}
	}
	foreach ($vs_changesets_path_map as $path => $changeset) {
	$changesets[$changeset->getID()] = $changeset;
	$vs_map[$changeset->getID()] = -1;
	$refs[$changeset->getID()] = $changeset->getID().'/-1';
	}
	} else {
	foreach ($changesets as $changeset) {
	$refs[$changeset->getID()] = $changeset->getID();
	}
	}

	$changesets = msort($changesets, 'getSortKey');

	return array($changesets, $vs_map, $vs_changesets, $refs);
	}

	private function loadAuxiliaryFields(DifferentialRevision $revision) {

	$aux_fields = DifferentialFieldSelector::newSelector()
	->getFieldSpecifications();
	foreach ($aux_fields as $key => $aux_field) {
	if (!$aux_field->shouldAppearOnRevisionView()) {
	unset($aux_fields[$key]);
	} else {
	$aux_field->setUser($this->getRequest()->getUser());
	}
	}

	$aux_fields = DifferentialAuxiliaryField::loadFromStorage(
	$revision,
	$aux_fields);

	return $aux_fields;
	}

	private function buildSymbolIndexes(
	PhabricatorRepositoryArcanistProject $arc_project,
	array $visible_changesets) {
	assert_instances_of($visible_changesets, 'DifferentialChangeset');

	$engine = PhabricatorSyntaxHighlighter::newEngine();

	$langs = $arc_project->getSymbolIndexLanguages();
	if (!$langs) {
	return array(array(), array());
	}

	$symbol_indexes = array();

	$project_phids = array_merge(
	array($arc_project->getPHID()),
	nonempty($arc_project->getSymbolIndexProjects(), array()));

	$indexed_langs = array_fill_keys($langs, true);
	foreach ($visible_changesets as $key => $changeset) {
	$lang = $engine->getLanguageFromFilename($changeset->getFilename());
	if (isset($indexed_langs[$lang])) {
	$symbol_indexes[$key] = array(
	'lang' => $lang,
	'projects' => $project_phids,
	);
	}
	}

	return array($symbol_indexes, $project_phids);
	}

	private function loadOtherRevisions(
	array $changesets,
	DifferentialDiff $target,
	PhabricatorRepository $repository) {
	assert_instances_of($changesets, 'DifferentialChangeset');

	$paths = array();
	foreach ($changesets as $changeset) {
	$paths[] = $changeset->getAbsoluteRepositoryPath(
	$repository,
	$target);
	}

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

	$path_map = id(new DiffusionPathIDQuery($paths))->loadPathIDs();

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

	$query = id(new DifferentialRevisionQuery())
	->setViewer($this->getRequest()->getUser())
	->withStatus(DifferentialRevisionQuery::STATUS_OPEN)
	->setOrder(DifferentialRevisionQuery::ORDER_PATH_MODIFIED)
	->setLimit(10)
	->needFlags(true)
	->needDrafts(true)
	->needRelationships(true);

	foreach ($path_map as $path => $path_id) {
	$query->withPath($repository->getID(), $path_id);
	}

	$results = $query->execute();

	// Strip out this revision.
	foreach ($results as $key => $result) {
	if ($result->getID() == $this->revisionID) {
	unset($results[$key]);
	}
	}

	return $results;
	}

	private function renderOtherRevisions(array $revisions) {
	assert_instances_of($revisions, 'DifferentialRevision');

	$user = $this->getRequest()->getUser();

	$view = id(new DifferentialRevisionListView())
	->setRevisions($revisions)
	->setFields(DifferentialRevisionListView::getDefaultFields($user))
	->setUser($user);

	$phids = $view->getRequiredHandlePHIDs();
	$handles = $this->loadViewerHandles($phids);
	$view->setHandles($handles);

	return id(new PHUIObjectBoxView())
	->setHeaderText(pht('Open Revisions Affecting These Files'))
	->appendChild($view);
	}


	/**
	* Note this code is somewhat similar to the buildPatch method in
	* @{class:DifferentialReviewRequestMail}.
	*
	* @return @{class:AphrontRedirectResponse}
	*/
	private function buildRawDiffResponse(
	DifferentialRevision $revision,
	array $changesets,
	array $vs_changesets,
	array $vs_map,
	PhabricatorRepository $repository = null) {

	assert_instances_of($changesets, 'DifferentialChangeset');
	assert_instances_of($vs_changesets, 'DifferentialChangeset');

	$viewer = $this->getRequest()->getUser();

	foreach ($changesets as $changeset) {
	$changeset->attachHunks($changeset->loadHunks());
	}

	$diff = new DifferentialDiff();
	$diff->attachChangesets($changesets);
	$raw_changes = $diff->buildChangesList();
	$changes = array();
	foreach ($raw_changes as $changedict) {
	$changes[] = ArcanistDiffChange::newFromDictionary($changedict);
	}

	$loader = id(new PhabricatorFileBundleLoader())
	->setViewer($viewer);

	$bundle = ArcanistBundle::newFromChanges($changes);
	$bundle->setLoadFileDataCallback(array($loader, 'loadFileData'));

	$vcs = $repository ? $repository->getVersionControlSystem() : null;
	switch ($vcs) {
	case PhabricatorRepositoryType::REPOSITORY_TYPE_GIT:
	case PhabricatorRepositoryType::REPOSITORY_TYPE_MERCURIAL:
	$raw_diff = $bundle->toGitPatch();
	break;
	case PhabricatorRepositoryType::REPOSITORY_TYPE_SVN:
	default:
	$raw_diff = $bundle->toUnifiedDiff();
	break;
	}

	$request_uri = $this->getRequest()->getRequestURI();

	// this ends up being something like
	// D123.diff
	// or the verbose
	// D123.vs123.id123.whitespaceignore-all.diff
	// lame but nice to include these options
	$file_name = ltrim($request_uri->getPath(), '/').'.';
	foreach ($request_uri->getQueryParams() as $key => $value) {
	if ($key == 'download') {
	continue;
	}
	$file_name .= $key.$value.'.';
	}
	$file_name .= 'diff';

	$file = PhabricatorFile::buildFromFileDataOrHash(
	$raw_diff,
	array(
	'name' => $file_name,
	'ttl' => (60 * 60 * 24),
	'viewPolicy' => PhabricatorPolicies::POLICY_NOONE,
	));

	$unguarded = AphrontWriteGuard::beginScopedUnguardedWrites();
	$file->attachToObject(
	$this->getRequest()->getUser(),
	$revision->getPHID());
	unset($unguarded);

	return id(new AphrontRedirectResponse())->setURI($file->getBestURI());

	}

	private function buildTransactions(
	DifferentialRevision $revision,
	DifferentialDiff $left_diff,
	DifferentialDiff $right_diff,
	array $changesets) {
	$viewer = $this->getRequest()->getUser();

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

	$engine = id(new PhabricatorMarkupEngine())
	->setViewer($viewer);

	$timeline = id(new DifferentialTransactionView())
	->setUser($viewer)
	->setObjectPHID($revision->getPHID())
	->setChangesets($changesets)
	->setRevision($revision)
	->setLeftDiff($left_diff)
	->setRightDiff($right_diff)
	->setTransactions($xactions);

	// TODO: Make this work and restore edit links. We need to copy
	// `revisionPHID` to the new version of the comment. This should be simple,
	// but can happen post-merge. See T2222.
	$timeline->setShowEditActions(false);

	return $timeline;
	}

	+ private function buildRevisionWarnings(
	+ DifferentialRevision $revision,
	+ array $handles) {
	+
	+ $status_needs_review = ArcanistDifferentialRevisionStatus::NEEDS_REVIEW;
	+ if ($revision->getStatus() != $status_needs_review) {
	+ return;
	+ }
	+
	+ foreach ($revision->getReviewers() as $reviewer) {
	+ if (!$handles[$reviewer]->isDisabled()) {
	+ return;
	+ }
	+ }
	+
	+ $warnings = array();
	+ if ($revision->getReviewers()) {
	+ $warnings[] = pht(
	+ 'This revision needs review, but all specified reviewers are '.
	+ 'disabled or inactive.');
	+ } else {
	+ $warnings[] = pht(
	+ 'This revision needs review, but there are no reviewers specified.');
	+ }
	+
	+ return id(new AphrontErrorView())
	+ ->setSeverity(AphrontErrorView::SEVERITY_WARNING)
	+ ->setErrors($warnings);
	+ }
	+
	}

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