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	diff --git a/src/applications/transactions/storage/PhabricatorApplicationTransaction.php b/src/applications/transactions/storage/PhabricatorApplicationTransaction.php
	index c03cefeed0..607b3713a6 100644
	--- a/src/applications/transactions/storage/PhabricatorApplicationTransaction.php
	+++ b/src/applications/transactions/storage/PhabricatorApplicationTransaction.php
	@@ -1,2046 +1,2048 @@
	<?php

	abstract class PhabricatorApplicationTransaction
	extends PhabricatorLiskDAO
	implements
	PhabricatorPolicyInterface,
	PhabricatorDestructibleInterface {

	const TARGET_TEXT = 'text';
	const TARGET_HTML = 'html';

	protected $phid;
	protected $objectPHID;
	protected $authorPHID;
	protected $viewPolicy;
	protected $editPolicy;

	protected $commentPHID;
	protected $commentVersion = 0;
	protected $transactionType;
	protected $oldValue;
	protected $newValue;
	protected $metadata = array();

	protected $contentSource;

	private $comment;
	private $commentNotLoaded;

	private $handles;
	private $renderingTarget = self::TARGET_HTML;
	private $transactionGroup = array();
	private $viewer = self::ATTACHABLE;
	private $object = self::ATTACHABLE;
	private $oldValueHasBeenSet = false;

	private $ignoreOnNoEffect;


	/**
	* Flag this transaction as a pure side-effect which should be ignored when
	* applying transactions if it has no effect, even if transaction application
	* would normally fail. This both provides users with better error messages
	* and allows transactions to perform optional side effects.
	*/
	public function setIgnoreOnNoEffect($ignore) {
	$this->ignoreOnNoEffect = $ignore;
	return $this;
	}

	public function getIgnoreOnNoEffect() {
	return $this->ignoreOnNoEffect;
	}

	public function shouldGenerateOldValue() {
	switch ($this->getTransactionType()) {
	case PhabricatorTransactions::TYPE_TOKEN:
	case PhabricatorTransactions::TYPE_CUSTOMFIELD:
	case PhabricatorTransactions::TYPE_INLINESTATE:
	return false;
	}
	return true;
	}

	abstract public function getApplicationTransactionType();

	private function getApplicationObjectTypeName() {
	$types = PhabricatorPHIDType::getAllTypes();

	$type = idx($types, $this->getApplicationTransactionType());
	if ($type) {
	return $type->getTypeName();
	}

	return pht('Object');
	}

	public function getApplicationTransactionCommentObject() {
	return null;
	}

	public function getMetadataValue($key, $default = null) {
	return idx($this->metadata, $key, $default);
	}

	public function setMetadataValue($key, $value) {
	$this->metadata[$key] = $value;
	return $this;
	}

	public function generatePHID() {
	$type = PhabricatorApplicationTransactionTransactionPHIDType::TYPECONST;
	$subtype = $this->getApplicationTransactionType();

	return PhabricatorPHID::generateNewPHID($type, $subtype);
	}

	protected function getConfiguration() {
	return array(
	self::CONFIG_AUX_PHID => true,
	self::CONFIG_SERIALIZATION => array(
	'oldValue' => self::SERIALIZATION_JSON,
	'newValue' => self::SERIALIZATION_JSON,
	'metadata' => self::SERIALIZATION_JSON,
	),
	self::CONFIG_COLUMN_SCHEMA => array(
	'commentPHID' => 'phid?',
	'commentVersion' => 'uint32',
	'contentSource' => 'text',
	'transactionType' => 'text32',
	),
	self::CONFIG_KEY_SCHEMA => array(
	'key_object' => array(
	'columns' => array('objectPHID'),
	),
	),
	) + parent::getConfiguration();
	}

	public function setContentSource(PhabricatorContentSource $content_source) {
	$this->contentSource = $content_source->serialize();
	return $this;
	}

	public function getContentSource() {
	return PhabricatorContentSource::newFromSerialized($this->contentSource);
	}

	public function hasComment() {
	$comment = $this->getComment();
	if (!$comment) {
	return false;
	}

	if ($comment->isEmptyComment()) {
	return false;
	}

	return true;
	}

	public function getComment() {
	if ($this->commentNotLoaded) {
	throw new Exception(pht('Comment for this transaction was not loaded.'));
	}
	return $this->comment;
	}

	public function setIsCreateTransaction($create) {
	return $this->setMetadataValue('core.create', $create);
	}

	public function getIsCreateTransaction() {
	return (bool)$this->getMetadataValue('core.create', false);
	}

	public function setIsDefaultTransaction($default) {
	return $this->setMetadataValue('core.default', $default);
	}

	public function getIsDefaultTransaction() {
	return (bool)$this->getMetadataValue('core.default', false);
	}

	public function setIsSilentTransaction($silent) {
	return $this->setMetadataValue('core.silent', $silent);
	}

	public function getIsSilentTransaction() {
	return (bool)$this->getMetadataValue('core.silent', false);
	}

	public function setIsMFATransaction($mfa) {
	return $this->setMetadataValue('core.mfa', $mfa);
	}

	public function getIsMFATransaction() {
	return (bool)$this->getMetadataValue('core.mfa', false);
	}

	public function setIsLockOverrideTransaction($override) {
	return $this->setMetadataValue('core.lock-override', $override);
	}

	public function getIsLockOverrideTransaction() {
	return (bool)$this->getMetadataValue('core.lock-override', false);
	}

	public function setTransactionGroupID($group_id) {
	return $this->setMetadataValue('core.groupID', $group_id);
	}

	public function getTransactionGroupID() {
	return $this->getMetadataValue('core.groupID', null);
	}

	public function attachComment(
	PhabricatorApplicationTransactionComment $comment) {
	$this->comment = $comment;
	$this->commentNotLoaded = false;
	return $this;
	}

	public function setCommentNotLoaded($not_loaded) {
	$this->commentNotLoaded = $not_loaded;
	return $this;
	}

	public function attachObject($object) {
	$this->object = $object;
	return $this;
	}

	public function getObject() {
	return $this->assertAttached($this->object);
	}

	public function getRemarkupChanges() {
	$changes = $this->newRemarkupChanges();
	assert_instances_of($changes, 'PhabricatorTransactionRemarkupChange');

	// Convert older-style remarkup blocks into newer-style remarkup changes.
	// This builds changes that do not have the correct "old value", so rules
	// that operate differently against edits (like @user mentions) won't work
	// properly.
	foreach ($this->getRemarkupBlocks() as $block) {
	$changes[] = $this->newRemarkupChange()
	->setOldValue(null)
	->setNewValue($block);
	}

	$comment = $this->getComment();
	if ($comment) {
	if ($comment->hasOldComment()) {
	$old_value = $comment->getOldComment()->getContent();
	} else {
	$old_value = null;
	}

	$new_value = $comment->getContent();

	$changes[] = $this->newRemarkupChange()
	->setOldValue($old_value)
	->setNewValue($new_value);
	}

	$metadata = $this->getMetadataValue('remarkup.control');

	if (!is_array($metadata)) {
	$metadata = array();
	}

	foreach ($changes as $change) {
	if (!$change->getMetadata()) {
	$change->setMetadata($metadata);
	}
	}

	return $changes;
	}

	protected function newRemarkupChanges() {
	return array();
	}

	protected function newRemarkupChange() {
	return id(new PhabricatorTransactionRemarkupChange())
	->setTransaction($this);
	}

	/**
	* @deprecated
	*/
	public function getRemarkupBlocks() {
	$blocks = array();

	switch ($this->getTransactionType()) {
	case PhabricatorTransactions::TYPE_CUSTOMFIELD:
	$field = $this->getTransactionCustomField();
	if ($field) {
	$custom_blocks = $field->getApplicationTransactionRemarkupBlocks(
	$this);
	foreach ($custom_blocks as $custom_block) {
	$blocks[] = $custom_block;
	}
	}
	break;
	}

	return $blocks;
	}

	public function setOldValue($value) {
	$this->oldValueHasBeenSet = true;
	$this->writeField('oldValue', $value);
	return $this;
	}

	public function hasOldValue() {
	return $this->oldValueHasBeenSet;
	}

	public function newChronologicalSortVector() {
	return id(new PhutilSortVector())
	->addInt((int)$this->getDateCreated())
	->addInt((int)$this->getID());
	}

	/* -( Rendering )---------------------------------------------------------- */

	public function setRenderingTarget($rendering_target) {
	$this->renderingTarget = $rendering_target;
	return $this;
	}

	public function getRenderingTarget() {
	return $this->renderingTarget;
	}

	public function attachViewer(PhabricatorUser $viewer) {
	$this->viewer = $viewer;
	return $this;
	}

	public function getViewer() {
	return $this->assertAttached($this->viewer);
	}

	public function getRequiredHandlePHIDs() {
	$phids = array();

	$old = $this->getOldValue();
	$new = $this->getNewValue();

	$phids[] = array($this->getAuthorPHID());
	$phids[] = array($this->getObjectPHID());
	switch ($this->getTransactionType()) {
	case PhabricatorTransactions::TYPE_CUSTOMFIELD:
	$field = $this->getTransactionCustomField();
	if ($field) {
	$phids[] = $field->getApplicationTransactionRequiredHandlePHIDs(
	$this);
	}
	break;
	case PhabricatorTransactions::TYPE_SUBSCRIBERS:
	$phids[] = $old;
	$phids[] = $new;
	break;
	case PhabricatorTransactions::TYPE_FILE:
	$phids[] = array_keys($old + $new);
	break;
	case PhabricatorTransactions::TYPE_EDGE:
	$record = PhabricatorEdgeChangeRecord::newFromTransaction($this);
	$phids[] = $record->getChangedPHIDs();
	break;
	case PhabricatorTransactions::TYPE_COLUMNS:
	foreach ($new as $move) {
	$phids[] = array(
	$move['columnPHID'],
	$move['boardPHID'],
	);
	$phids[] = $move['fromColumnPHIDs'];
	}
	break;
	case PhabricatorTransactions::TYPE_EDIT_POLICY:
	case PhabricatorTransactions::TYPE_VIEW_POLICY:
	case PhabricatorTransactions::TYPE_JOIN_POLICY:
	case PhabricatorTransactions::TYPE_INTERACT_POLICY:
	if (!PhabricatorPolicyQuery::isSpecialPolicy($old)) {
	$phids[] = array($old);
	}
	if (!PhabricatorPolicyQuery::isSpecialPolicy($new)) {
	$phids[] = array($new);
	}
	break;
	case PhabricatorTransactions::TYPE_SPACE:
	if ($old) {
	$phids[] = array($old);
	}
	if ($new) {
	$phids[] = array($new);
	}
	break;
	case PhabricatorTransactions::TYPE_TOKEN:
	break;
	}

	if ($this->getComment()) {
	$phids[] = array($this->getComment()->getAuthorPHID());
	}

	return array_mergev($phids);
	}

	public function setHandles(array $handles) {
	$this->handles = $handles;
	return $this;
	}

	public function getHandle($phid) {
	if (empty($this->handles[$phid])) {
	throw new Exception(
	pht(
	'Transaction ("%s", of type "%s") requires a handle ("%s") that it '.
	'did not load.',
	$this->getPHID(),
	$this->getTransactionType(),
	$phid));
	}
	return $this->handles[$phid];
	}

	public function getHandleIfExists($phid) {
	return idx($this->handles, $phid);
	}

	public function getHandles() {
	if ($this->handles === null) {
	throw new Exception(
	pht('Transaction requires handles and it did not load them.'));
	}
	return $this->handles;
	}

	public function renderHandleLink($phid) {
	if ($this->renderingTarget == self::TARGET_HTML) {
	return $this->getHandle($phid)->renderHovercardLink();
	} else {
	return $this->getHandle($phid)->getLinkName();
	}
	}

	public function renderHandleList(array $phids) {
	$links = array();
	foreach ($phids as $phid) {
	$links[] = $this->renderHandleLink($phid);
	}
	if ($this->renderingTarget == self::TARGET_HTML) {
	return phutil_implode_html(', ', $links);
	} else {
	return implode(', ', $links);
	}
	}

	private function renderSubscriberList(array $phids, $change_type) {
	if ($this->getRenderingTarget() == self::TARGET_TEXT) {
	return $this->renderHandleList($phids);
	} else {
	$handles = array_select_keys($this->getHandles(), $phids);
	return id(new SubscriptionListStringBuilder())
	->setHandles($handles)
	->setObjectPHID($this->getPHID())
	->buildTransactionString($change_type);
	}
	}

	protected function renderPolicyName($phid, $state = 'old') {
	$policy = PhabricatorPolicy::newFromPolicyAndHandle(
	$phid,
	$this->getHandleIfExists($phid));

	$ref = $policy->newRef($this->getViewer());

	if ($this->renderingTarget == self::TARGET_HTML) {
	$output = $ref->newTransactionLink($state, $this);
	} else {
	$output = $ref->getPolicyDisplayName();
	}

	return $output;
	}

	public function getIcon() {
	switch ($this->getTransactionType()) {
	case PhabricatorTransactions::TYPE_COMMENT:
	$comment = $this->getComment();
	if ($comment && $comment->getIsRemoved()) {
	return 'fa-trash';
	}
	return 'fa-comment';
	case PhabricatorTransactions::TYPE_SUBSCRIBERS:
	$old = $this->getOldValue();
	$new = $this->getNewValue();
	$add = array_diff($new, $old);
	$rem = array_diff($old, $new);
	if ($add && $rem) {
	return 'fa-user';
	} else if ($add) {
	return 'fa-user-plus';
	} else if ($rem) {
	return 'fa-user-times';
	} else {
	return 'fa-user';
	}
	case PhabricatorTransactions::TYPE_VIEW_POLICY:
	case PhabricatorTransactions::TYPE_EDIT_POLICY:
	case PhabricatorTransactions::TYPE_JOIN_POLICY:
	case PhabricatorTransactions::TYPE_INTERACT_POLICY:
	return 'fa-lock';
	case PhabricatorTransactions::TYPE_EDGE:
	switch ($this->getMetadataValue('edge:type')) {
	case DiffusionCommitRevertedByCommitEdgeType::EDGECONST:
	return 'fa-undo';
	case DiffusionCommitRevertsCommitEdgeType::EDGECONST:
	return 'fa-ambulance';
	}
	return 'fa-link';
	case PhabricatorTransactions::TYPE_TOKEN:
	return 'fa-trophy';
	case PhabricatorTransactions::TYPE_SPACE:
	return 'fa-th-large';
	case PhabricatorTransactions::TYPE_COLUMNS:
	return 'fa-columns';
	case PhabricatorTransactions::TYPE_MFA:
	return 'fa-vcard';
	}

	return 'fa-pencil';
	}

	public function getToken() {
	switch ($this->getTransactionType()) {
	case PhabricatorTransactions::TYPE_TOKEN:
	$old = $this->getOldValue();
	$new = $this->getNewValue();
	if ($new) {
	$icon = substr($new, 10);
	} else {
	$icon = substr($old, 10);
	}
	return array($icon, !$this->getNewValue());
	}

	return array(null, null);
	}

	public function getColor() {
	switch ($this->getTransactionType()) {
	case PhabricatorTransactions::TYPE_COMMENT;
	$comment = $this->getComment();
	if ($comment && $comment->getIsRemoved()) {
	return 'grey';
	}
	break;
	case PhabricatorTransactions::TYPE_EDGE:
	switch ($this->getMetadataValue('edge:type')) {
	case DiffusionCommitRevertedByCommitEdgeType::EDGECONST:
	return 'pink';
	case DiffusionCommitRevertsCommitEdgeType::EDGECONST:
	return 'sky';
	}
	break;
	case PhabricatorTransactions::TYPE_MFA;
	return 'pink';
	}
	return null;
	}

	protected function getTransactionCustomField() {
	switch ($this->getTransactionType()) {
	case PhabricatorTransactions::TYPE_CUSTOMFIELD:
	$key = $this->getMetadataValue('customfield:key');
	if (!$key) {
	return null;
	}

	$object = $this->getObject();

	if (!($object instanceof PhabricatorCustomFieldInterface)) {
	return null;
	}

	$field = PhabricatorCustomField::getObjectField(
	$object,
	PhabricatorCustomField::ROLE_APPLICATIONTRANSACTIONS,
	$key);
	if (!$field) {
	return null;
	}

	$field->setViewer($this->getViewer());
	return $field;
	}

	return null;
	}

	public function shouldHide() {
	// Never hide comments.
	if ($this->hasComment()) {
	return false;
	}

	$xaction_type = $this->getTransactionType();

	// Always hide requests for object history.
	if ($xaction_type === PhabricatorTransactions::TYPE_HISTORY) {
	return true;
	}

	// Always hide file attach/detach transactions.
	if ($xaction_type === PhabricatorTransactions::TYPE_FILE) {
	if ($this->getMetadataValue('attach.implicit')) {
	return true;
	}
	}

	// Hide creation transactions if the old value is empty. These are
	// transactions like "alice set the task title to: ...", which are
	// essentially never interesting.
	if ($this->getIsCreateTransaction()) {
	switch ($xaction_type) {
	case PhabricatorTransactions::TYPE_CREATE:
	case PhabricatorTransactions::TYPE_VIEW_POLICY:
	case PhabricatorTransactions::TYPE_EDIT_POLICY:
	case PhabricatorTransactions::TYPE_JOIN_POLICY:
	case PhabricatorTransactions::TYPE_INTERACT_POLICY:
	case PhabricatorTransactions::TYPE_SPACE:
	break;
	case PhabricatorTransactions::TYPE_SUBTYPE:
	return true;
	default:
	$old = $this->getOldValue();

	if (is_array($old) && !$old) {
	return true;
	}

	if (!is_array($old)) {
	if ($old === '' \|\| $old === null) {
	return true;
	}

	// The integer 0 is also uninteresting by default; this is often
	// an "off" flag for something like "All Day Event".
	if ($old === 0) {
	return true;
	}
	}

	break;
	}
	}

	// Hide creation transactions setting values to defaults, even if
	// the old value is not empty. For example, tasks may have a global
	// default view policy of "All Users", but a particular form sets the
	// policy to "Administrators". The transaction corresponding to this
	// change is not interesting, since it is the default behavior of the
	// form.

	if ($this->getIsCreateTransaction()) {
	if ($this->getIsDefaultTransaction()) {
	return true;
	}
	}

	switch ($this->getTransactionType()) {
	case PhabricatorTransactions::TYPE_VIEW_POLICY:
	case PhabricatorTransactions::TYPE_EDIT_POLICY:
	case PhabricatorTransactions::TYPE_JOIN_POLICY:
	case PhabricatorTransactions::TYPE_INTERACT_POLICY:
	case PhabricatorTransactions::TYPE_SPACE:
	if ($this->getIsCreateTransaction()) {
	break;
	}

	// TODO: Remove this eventually, this is handling old changes during
	// object creation prior to the introduction of "create" and "default"
	// transaction display flags.

	// NOTE: We can also hit this case with Space transactions that later
	// update a default space (`null`) to an explicit space, so handling
	// the Space case may require some finesse.

	if ($this->getOldValue() === null) {
	return true;
	} else {
	return false;
	}
	break;
	case PhabricatorTransactions::TYPE_CUSTOMFIELD:
	$field = $this->getTransactionCustomField();
	if ($field) {
	return $field->shouldHideInApplicationTransactions($this);
	}
	break;
	case PhabricatorTransactions::TYPE_COLUMNS:
	return !$this->getInterestingMoves($this->getNewValue());
	case PhabricatorTransactions::TYPE_EDGE:
	$edge_type = $this->getMetadataValue('edge:type');
	switch ($edge_type) {
	case PhabricatorObjectMentionsObjectEdgeType::EDGECONST:
	case ManiphestTaskHasDuplicateTaskEdgeType::EDGECONST:
	case ManiphestTaskIsDuplicateOfTaskEdgeType::EDGECONST:
	case PhabricatorMutedEdgeType::EDGECONST:
	case PhabricatorMutedByEdgeType::EDGECONST:
	return true;
	case PhabricatorObjectMentionedByObjectEdgeType::EDGECONST:
	$record = PhabricatorEdgeChangeRecord::newFromTransaction($this);
	$add = $record->getAddedPHIDs();
	$add_value = reset($add);
	$add_handle = $this->getHandle($add_value);
	if ($add_handle->getPolicyFiltered()) {
	return true;
	}
	return false;
	break;
	default:
	break;
	}
	break;

	case PhabricatorTransactions::TYPE_INLINESTATE:
	list($done, $undone) = $this->getInterestingInlineStateChangeCounts();

	if (!$done && !$undone) {
	return true;
	}

	break;

	}

	return false;
	}

	public function shouldHideForMail(array $xactions) {
	if ($this->isSelfSubscription()) {
	return true;
	}

	switch ($this->getTransactionType()) {
	case PhabricatorTransactions::TYPE_TOKEN:
	return true;
	case PhabricatorTransactions::TYPE_EDGE:
	$edge_type = $this->getMetadataValue('edge:type');
	switch ($edge_type) {
	case PhabricatorObjectMentionsObjectEdgeType::EDGECONST:
	case PhabricatorObjectMentionedByObjectEdgeType::EDGECONST:
	case DifferentialRevisionDependsOnRevisionEdgeType::EDGECONST:
	case DifferentialRevisionDependedOnByRevisionEdgeType::EDGECONST:
	case ManiphestTaskHasCommitEdgeType::EDGECONST:
	case DiffusionCommitHasTaskEdgeType::EDGECONST:
	case DiffusionCommitHasRevisionEdgeType::EDGECONST:
	case DifferentialRevisionHasCommitEdgeType::EDGECONST:
	return true;
	case PhabricatorProjectObjectHasProjectEdgeType::EDGECONST:
	// When an object is first created, we hide any corresponding
	// project transactions in the web UI because you can just look at
	// the UI element elsewhere on screen to see which projects it
	// is tagged with. However, in mail there's no other way to get
	// this information, and it has some amount of value to users, so
	// we keep the transaction. See T10493.
	return false;
	default:
	break;
	}
	break;
	}

	if ($this->isInlineCommentTransaction()) {
	$inlines = array();

	// If there's a normal comment, we don't need to publish the inline
	// transaction, since the normal comment covers things.
	foreach ($xactions as $xaction) {
	if ($xaction->isInlineCommentTransaction()) {
	$inlines[] = $xaction;
	continue;
	}

	// We found a normal comment, so hide this inline transaction.
	if ($xaction->hasComment()) {
	return true;
	}
	}

	// If there are several inline comments, only publish the first one.
	if ($this !== head($inlines)) {
	return true;
	}
	}

	return $this->shouldHide();
	}

	public function shouldHideForFeed() {
	if ($this->isSelfSubscription()) {
	return true;
	}

	switch ($this->getTransactionType()) {
	case PhabricatorTransactions::TYPE_TOKEN:
	case PhabricatorTransactions::TYPE_MFA:
	return true;
	case PhabricatorTransactions::TYPE_SUBSCRIBERS:
	// See T8952. When an application (usually Herald) modifies
	// subscribers, this tends to be very uninteresting.
	if ($this->isApplicationAuthor()) {
	return true;
	}
	break;
	case PhabricatorTransactions::TYPE_EDGE:
	$edge_type = $this->getMetadataValue('edge:type');
	switch ($edge_type) {
	case PhabricatorObjectMentionsObjectEdgeType::EDGECONST:
	case PhabricatorObjectMentionedByObjectEdgeType::EDGECONST:
	case DifferentialRevisionDependsOnRevisionEdgeType::EDGECONST:
	case DifferentialRevisionDependedOnByRevisionEdgeType::EDGECONST:
	case ManiphestTaskHasCommitEdgeType::EDGECONST:
	case DiffusionCommitHasTaskEdgeType::EDGECONST:
	case DiffusionCommitHasRevisionEdgeType::EDGECONST:
	case DifferentialRevisionHasCommitEdgeType::EDGECONST:
	return true;
	default:
	break;
	}
	break;
	case PhabricatorTransactions::TYPE_INLINESTATE:
	return true;
	}

	return $this->shouldHide();
	}

	public function shouldHideForNotifications() {
	return $this->shouldHideForFeed();
	}

	private function getTitleForMailWithRenderingTarget($new_target) {
	$old_target = $this->getRenderingTarget();
	try {
	$this->setRenderingTarget($new_target);
	$result = $this->getTitleForMail();
	} catch (Exception $ex) {
	$this->setRenderingTarget($old_target);
	throw $ex;
	}
	$this->setRenderingTarget($old_target);
	return $result;
	}

	public function getTitleForMail() {
	return $this->getTitle();
	}

	public function getTitleForTextMail() {
	return $this->getTitleForMailWithRenderingTarget(self::TARGET_TEXT);
	}

	public function getTitleForHTMLMail() {
	// TODO: For now, rendering this with TARGET_HTML generates links with
	// bad targets ("/x/y/" instead of "https://dev.example.com/x/y/"). Throw
	// a rug over the issue for the moment. See T12921.

	$title = $this->getTitleForMailWithRenderingTarget(self::TARGET_TEXT);
	if ($title === null) {
	return null;
	}

	if ($this->hasChangeDetails()) {
	$details_uri = $this->getChangeDetailsURI();
	$details_uri = PhabricatorEnv::getProductionURI($details_uri);

	$show_details = phutil_tag(
	'a',
	array(
	'href' => $details_uri,
	),
	pht('(Show Details)'));

	$title = array($title, ' ', $show_details);
	}

	return $title;
	}

	public function getChangeDetailsURI() {
	return '/transactions/detail/'.$this->getPHID().'/';
	}

	public function getBodyForMail() {
	if ($this->isInlineCommentTransaction()) {
	// We don't return inline comment content as mail body content, because
	// applications need to contextualize it (by adding line numbers, for
	// example) in order for it to make sense.
	return null;
	}

	$comment = $this->getComment();
	if ($comment && strlen($comment->getContent())) {
	return $comment->getContent();
	}

	return null;
	}

	public function getNoEffectDescription() {

	switch ($this->getTransactionType()) {
	case PhabricatorTransactions::TYPE_COMMENT:
	return pht('You can not post an empty comment.');
	case PhabricatorTransactions::TYPE_VIEW_POLICY:
	return pht(
	'This %s already has that view policy.',
	$this->getApplicationObjectTypeName());
	case PhabricatorTransactions::TYPE_EDIT_POLICY:
	return pht(
	'This %s already has that edit policy.',
	$this->getApplicationObjectTypeName());
	case PhabricatorTransactions::TYPE_JOIN_POLICY:
	return pht(
	'This %s already has that join policy.',
	$this->getApplicationObjectTypeName());
	case PhabricatorTransactions::TYPE_INTERACT_POLICY:
	return pht(
	'This %s already has that interact policy.',
	$this->getApplicationObjectTypeName());
	case PhabricatorTransactions::TYPE_SUBSCRIBERS:
	return pht(
	'All users are already subscribed to this %s.',
	$this->getApplicationObjectTypeName());
	case PhabricatorTransactions::TYPE_SPACE:
	return pht('This object is already in that space.');
	case PhabricatorTransactions::TYPE_EDGE:
	return pht('Edges already exist; transaction has no effect.');
	case PhabricatorTransactions::TYPE_COLUMNS:
	return pht(
	'You have not moved this object to any columns it is not '.
	'already in.');
	case PhabricatorTransactions::TYPE_MFA:
	return pht(
	'You can not sign a transaction group that has no other '.
	'effects.');
	}

	return pht(
	'Transaction (of type "%s") has no effect.',
	$this->getTransactionType());
	}

	public function getTitle() {
	$author_phid = $this->getAuthorPHID();

	$old = $this->getOldValue();
	$new = $this->getNewValue();

	switch ($this->getTransactionType()) {
	case PhabricatorTransactions::TYPE_CREATE:
	return pht(
	'%s created this object.',
	$this->renderHandleLink($author_phid));
	case PhabricatorTransactions::TYPE_COMMENT:
	return pht(
	'%s added a comment.',
	$this->renderHandleLink($author_phid));
	case PhabricatorTransactions::TYPE_VIEW_POLICY:
	if ($this->getIsCreateTransaction()) {
	return pht(
	'%s created this object with visibility "%s".',
	$this->renderHandleLink($author_phid),
	$this->renderPolicyName($new, 'new'));
	} else {
	return pht(
	'%s changed the visibility from "%s" to "%s".',
	$this->renderHandleLink($author_phid),
	$this->renderPolicyName($old, 'old'),
	$this->renderPolicyName($new, 'new'));
	}
	case PhabricatorTransactions::TYPE_EDIT_POLICY:
	if ($this->getIsCreateTransaction()) {
	return pht(
	'%s created this object with edit policy "%s".',
	$this->renderHandleLink($author_phid),
	$this->renderPolicyName($new, 'new'));
	} else {
	return pht(
	'%s changed the edit policy from "%s" to "%s".',
	$this->renderHandleLink($author_phid),
	$this->renderPolicyName($old, 'old'),
	$this->renderPolicyName($new, 'new'));
	}
	case PhabricatorTransactions::TYPE_JOIN_POLICY:
	if ($this->getIsCreateTransaction()) {
	return pht(
	'%s created this object with join policy "%s".',
	$this->renderHandleLink($author_phid),
	$this->renderPolicyName($new, 'new'));
	} else {
	return pht(
	'%s changed the join policy from "%s" to "%s".',
	$this->renderHandleLink($author_phid),
	$this->renderPolicyName($old, 'old'),
	$this->renderPolicyName($new, 'new'));
	}
	case PhabricatorTransactions::TYPE_INTERACT_POLICY:
	if ($this->getIsCreateTransaction()) {
	return pht(
	'%s created this object with interact policy "%s".',
	$this->renderHandleLink($author_phid),
	$this->renderPolicyName($new, 'new'));
	} else {
	return pht(
	'%s changed the interact policy from "%s" to "%s".',
	$this->renderHandleLink($author_phid),
	$this->renderPolicyName($old, 'old'),
	$this->renderPolicyName($new, 'new'));
	}
	case PhabricatorTransactions::TYPE_SPACE:
	if ($this->getIsCreateTransaction()) {
	return pht(
	'%s created this object in space %s.',
	$this->renderHandleLink($author_phid),
	$this->renderHandleLink($new));
	} else {
	return pht(
	'%s shifted this object from the %s space to the %s space.',
	$this->renderHandleLink($author_phid),
	$this->renderHandleLink($old),
	$this->renderHandleLink($new));
	}
	case PhabricatorTransactions::TYPE_SUBSCRIBERS:
	$add = array_diff($new, $old);
	$rem = array_diff($old, $new);

	if ($add && $rem) {
	return pht(
	'%s edited subscriber(s), added %d: %s; removed %d: %s.',
	$this->renderHandleLink($author_phid),
	count($add),
	$this->renderSubscriberList($add, 'add'),
	count($rem),
	$this->renderSubscriberList($rem, 'rem'));
	} else if ($add) {
	if ($this->isSelfSubscription()) {
	return pht(
	'%s subscribed.',
	$this->renderHandleLink($author_phid));
	}
	return pht(
	'%s added %d subscriber(s): %s.',
	$this->renderHandleLink($author_phid),
	count($add),
	$this->renderSubscriberList($add, 'add'));
	} else if ($rem) {
	if ($this->isSelfSubscription()) {
	return pht(
	'%s unsubscribed.',
	$this->renderHandleLink($author_phid));
	}
	return pht(
	'%s removed %d subscriber(s): %s.',
	$this->renderHandleLink($author_phid),
	count($rem),
	$this->renderSubscriberList($rem, 'rem'));
	} else {
	// This is used when rendering previews, before the user actually
	// selects any CCs.
	return pht(
	'%s updated subscribers...',
	$this->renderHandleLink($author_phid));
	}
	break;
	case PhabricatorTransactions::TYPE_FILE:
	$add = array_diff_key($new, $old);
	$add = array_keys($add);

	$rem = array_diff_key($old, $new);
	$rem = array_keys($rem);

	$mod = array();
	foreach ($old + $new as $key => $ignored) {
	if (!isset($old[$key])) {
	continue;
	}

	if (!isset($new[$key])) {
	continue;
	}

	if ($old[$key] === $new[$key]) {
	continue;
	}

	$mod[] = $key;
	}

	// Specialize the specific case of only modifying files and upgrading
	// references to attachments. This is accessible via the UI and can
	// be shown more clearly than the generic default transaction shows
	// it.

	$mode_reference = PhabricatorFileAttachment::MODE_REFERENCE;
	$mode_attach = PhabricatorFileAttachment::MODE_ATTACH;

	$is_refattach = false;
	if ($mod && !$add && !$rem) {
	$all_refattach = true;
	foreach ($mod as $phid) {
	if (idx($old, $phid) !== $mode_reference) {
	$all_refattach = false;
	break;
	}
	if (idx($new, $phid) !== $mode_attach) {
	$all_refattach = false;
	break;
	}
	}
	$is_refattach = $all_refattach;
	}

	if ($is_refattach) {
	return pht(
	'%s attached %s referenced file(s): %s.',
	$this->renderHandleLink($author_phid),
	phutil_count($mod),
	$this->renderHandleList($mod));
	} else if ($add && $rem && $mod) {
	return pht(
	'%s updated %s attached file(s), added %s: %s; removed %s: %s; '.
	'modified %s: %s.',
	$this->renderHandleLink($author_phid),
	new PhutilNumber(count($add) + count($rem)),
	phutil_count($add),
	$this->renderHandleList($add),
	phutil_count($rem),
	$this->renderHandleList($rem),
	phutil_count($mod),
	$this->renderHandleList($mod));
	} else if ($add && $rem) {
	return pht(
	'%s updated %s attached file(s), added %s: %s; removed %s: %s.',
	$this->renderHandleLink($author_phid),
	new PhutilNumber(count($add) + count($rem)),
	phutil_count($add),
	$this->renderHandleList($add),
	phutil_count($rem),
	$this->renderHandleList($rem));
	} else if ($add && $mod) {
	return pht(
	'%s updated %s attached file(s), added %s: %s; modified %s: %s.',
	$this->renderHandleLink($author_phid),
	new PhutilNumber(count($add) + count($mod)),
	phutil_count($add),
	$this->renderHandleList($add),
	phutil_count($mod),
	$this->renderHandleList($mod));
	} else if ($rem && $mod) {
	return pht(
	'%s updated %s attached file(s), removed %s: %s; modified %s: %s.',
	$this->renderHandleLink($author_phid),
	new PhutilNumber(count($rem) + count($mod)),
	phutil_count($rem),
	$this->renderHandleList($rem),
	phutil_count($mod),
	$this->renderHandleList($mod));
	} else if ($add) {
	return pht(
	'%s attached %s file(s): %s.',
	$this->renderHandleLink($author_phid),
	phutil_count($add),
	$this->renderHandleList($add));
	} else if ($rem) {
	return pht(
	'%s removed %s attached file(s): %s.',
	$this->renderHandleLink($author_phid),
	phutil_count($rem),
	$this->renderHandleList($rem));
	} else if ($mod) {
	return pht(
	'%s modified %s attached file(s): %s.',
	$this->renderHandleLink($author_phid),
	phutil_count($mod),
	$this->renderHandleList($mod));
	} else {
	return pht(
	'%s attached files...',
	$this->renderHandleLink($author_phid));
	}

	break;
	case PhabricatorTransactions::TYPE_EDGE:
	$record = PhabricatorEdgeChangeRecord::newFromTransaction($this);
	$add = $record->getAddedPHIDs();
	$rem = $record->getRemovedPHIDs();

	$type = $this->getMetadata('edge:type');
	$type = head($type);

	try {
	$type_obj = PhabricatorEdgeType::getByConstant($type);
	} catch (Exception $ex) {
	// Recover somewhat gracefully from edge transactions which
	// we don't have the classes for.
	return pht(
	'%s edited an edge.',
	$this->renderHandleLink($author_phid));
	}

	if ($add && $rem) {
	return $type_obj->getTransactionEditString(
	$this->renderHandleLink($author_phid),
	new PhutilNumber(count($add) + count($rem)),
	phutil_count($add),
	$this->renderHandleList($add),
	phutil_count($rem),
	$this->renderHandleList($rem));
	} else if ($add) {
	return $type_obj->getTransactionAddString(
	$this->renderHandleLink($author_phid),
	phutil_count($add),
	$this->renderHandleList($add));
	} else if ($rem) {
	return $type_obj->getTransactionRemoveString(
	$this->renderHandleLink($author_phid),
	phutil_count($rem),
	$this->renderHandleList($rem));
	} else {
	return $type_obj->getTransactionPreviewString(
	$this->renderHandleLink($author_phid));
	}

	case PhabricatorTransactions::TYPE_CUSTOMFIELD:
	$field = $this->getTransactionCustomField();
	if ($field) {
	return $field->getApplicationTransactionTitle($this);
	} else {
	$developer_mode = 'phabricator.developer-mode';
	$is_developer = PhabricatorEnv::getEnvConfig($developer_mode);
	if ($is_developer) {
	return pht(
	'%s edited a custom field (with key "%s").',
	$this->renderHandleLink($author_phid),
	$this->getMetadata('customfield:key'));
	} else {
	return pht(
	'%s edited a custom field.',
	$this->renderHandleLink($author_phid));
	}
	}

	case PhabricatorTransactions::TYPE_TOKEN:
	if ($old && $new) {
	return pht(
	'%s updated a token.',
	$this->renderHandleLink($author_phid));
	} else if ($old) {
	return pht(
	'%s rescinded a token.',
	$this->renderHandleLink($author_phid));
	} else {
	return pht(
	'%s awarded a token.',
	$this->renderHandleLink($author_phid));
	}

	case PhabricatorTransactions::TYPE_INLINESTATE:
	list($done, $undone) = $this->getInterestingInlineStateChangeCounts();
	if ($done && $undone) {
	return pht(
	'%s marked %s inline comment(s) as done and %s inline comment(s) '.
	'as not done.',
	$this->renderHandleLink($author_phid),
	new PhutilNumber($done),
	new PhutilNumber($undone));
	} else if ($done) {
	return pht(
	'%s marked %s inline comment(s) as done.',
	$this->renderHandleLink($author_phid),
	new PhutilNumber($done));
	} else {
	return pht(
	'%s marked %s inline comment(s) as not done.',
	$this->renderHandleLink($author_phid),
	new PhutilNumber($undone));
	}
	break;

	case PhabricatorTransactions::TYPE_COLUMNS:
	$moves = $this->getInterestingMoves($new);
	if (count($moves) == 1) {
	$move = head($moves);
	$from_columns = $move['fromColumnPHIDs'];
	$to_column = $move['columnPHID'];
	$board_phid = $move['boardPHID'];
	if (count($from_columns) == 1) {
	return pht(
	'%s moved this task from %s to %s on the %s board.',
	$this->renderHandleLink($author_phid),
	$this->renderHandleLink(head($from_columns)),
	$this->renderHandleLink($to_column),
	$this->renderHandleLink($board_phid));
	} else {
	return pht(
	'%s moved this task to %s on the %s board.',
	$this->renderHandleLink($author_phid),
	$this->renderHandleLink($to_column),
	$this->renderHandleLink($board_phid));
	}
	} else {
	$fragments = array();
	foreach ($moves as $move) {
	$to_column = $move['columnPHID'];
	$board_phid = $move['boardPHID'];
	$fragments[] = pht(
	'%s (%s)',
	$this->renderHandleLink($board_phid),
	$this->renderHandleLink($to_column));
	}

	return pht(
	'%s moved this task on %s board(s): %s.',
	$this->renderHandleLink($author_phid),
	phutil_count($moves),
	phutil_implode_html(', ', $fragments));
	}
	break;


	case PhabricatorTransactions::TYPE_MFA:
	return pht(
	'%s signed these changes with MFA.',
	$this->renderHandleLink($author_phid));

	default:
	// In developer mode, provide a better hint here about which string
	// we're missing.
	$developer_mode = 'phabricator.developer-mode';
	$is_developer = PhabricatorEnv::getEnvConfig($developer_mode);
	if ($is_developer) {
	return pht(
	'%s edited this object (transaction type "%s").',
	$this->renderHandleLink($author_phid),
	$this->getTransactionType());
	} else {
	return pht(
	'%s edited this %s.',
	$this->renderHandleLink($author_phid),
	$this->getApplicationObjectTypeName());
	}
	}
	}

	public function getTitleForFeed() {
	$author_phid = $this->getAuthorPHID();
	$object_phid = $this->getObjectPHID();

	$old = $this->getOldValue();
	$new = $this->getNewValue();

	switch ($this->getTransactionType()) {
	case PhabricatorTransactions::TYPE_CREATE:
	return pht(
	'%s created %s.',
	$this->renderHandleLink($author_phid),
	$this->renderHandleLink($object_phid));
	case PhabricatorTransactions::TYPE_COMMENT:
	return pht(
	'%s added a comment to %s.',
	$this->renderHandleLink($author_phid),
	$this->renderHandleLink($object_phid));
	case PhabricatorTransactions::TYPE_VIEW_POLICY:
	return pht(
	'%s changed the visibility for %s.',
	$this->renderHandleLink($author_phid),
	$this->renderHandleLink($object_phid));
	case PhabricatorTransactions::TYPE_EDIT_POLICY:
	return pht(
	'%s changed the edit policy for %s.',
	$this->renderHandleLink($author_phid),
	$this->renderHandleLink($object_phid));
	case PhabricatorTransactions::TYPE_JOIN_POLICY:
	return pht(
	'%s changed the join policy for %s.',
	$this->renderHandleLink($author_phid),
	$this->renderHandleLink($object_phid));
	case PhabricatorTransactions::TYPE_INTERACT_POLICY:
	return pht(
	'%s changed the interact policy for %s.',
	$this->renderHandleLink($author_phid),
	$this->renderHandleLink($object_phid));
	case PhabricatorTransactions::TYPE_SUBSCRIBERS:
	return pht(
	'%s updated subscribers of %s.',
	$this->renderHandleLink($author_phid),
	$this->renderHandleLink($object_phid));
	case PhabricatorTransactions::TYPE_SPACE:
	if ($this->getIsCreateTransaction()) {
	return pht(
	'%s created %s in the %s space.',
	$this->renderHandleLink($author_phid),
	$this->renderHandleLink($object_phid),
	$this->renderHandleLink($new));
	} else {
	return pht(
	'%s shifted %s from the %s space to the %s space.',
	$this->renderHandleLink($author_phid),
	$this->renderHandleLink($object_phid),
	$this->renderHandleLink($old),
	$this->renderHandleLink($new));
	}
	case PhabricatorTransactions::TYPE_EDGE:
	$record = PhabricatorEdgeChangeRecord::newFromTransaction($this);
	$add = $record->getAddedPHIDs();
	$rem = $record->getRemovedPHIDs();

	$type = $this->getMetadata('edge:type');
	$type = head($type);

	$type_obj = PhabricatorEdgeType::getByConstant($type);

	if ($add && $rem) {
	return $type_obj->getFeedEditString(
	$this->renderHandleLink($author_phid),
	$this->renderHandleLink($object_phid),
	new PhutilNumber(count($add) + count($rem)),
	phutil_count($add),
	$this->renderHandleList($add),
	phutil_count($rem),
	$this->renderHandleList($rem));
	} else if ($add) {
	return $type_obj->getFeedAddString(
	$this->renderHandleLink($author_phid),
	$this->renderHandleLink($object_phid),
	phutil_count($add),
	$this->renderHandleList($add));
	} else if ($rem) {
	return $type_obj->getFeedRemoveString(
	$this->renderHandleLink($author_phid),
	$this->renderHandleLink($object_phid),
	phutil_count($rem),
	$this->renderHandleList($rem));
	} else {
	return pht(
	'%s edited edge metadata for %s.',
	$this->renderHandleLink($author_phid),
	$this->renderHandleLink($object_phid));
	}

	case PhabricatorTransactions::TYPE_CUSTOMFIELD:
	$field = $this->getTransactionCustomField();
	if ($field) {
	return $field->getApplicationTransactionTitleForFeed($this);
	} else {
	return pht(
	'%s edited a custom field on %s.',
	$this->renderHandleLink($author_phid),
	$this->renderHandleLink($object_phid));
	}

	case PhabricatorTransactions::TYPE_COLUMNS:
	$moves = $this->getInterestingMoves($new);
	if (count($moves) == 1) {
	$move = head($moves);
	$from_columns = $move['fromColumnPHIDs'];
	$to_column = $move['columnPHID'];
	$board_phid = $move['boardPHID'];
	if (count($from_columns) == 1) {
	return pht(
	'%s moved %s from %s to %s on the %s board.',
	$this->renderHandleLink($author_phid),
	$this->renderHandleLink($object_phid),
	$this->renderHandleLink(head($from_columns)),
	$this->renderHandleLink($to_column),
	$this->renderHandleLink($board_phid));
	} else {
	return pht(
	'%s moved %s to %s on the %s board.',
	$this->renderHandleLink($author_phid),
	$this->renderHandleLink($object_phid),
	$this->renderHandleLink($to_column),
	$this->renderHandleLink($board_phid));
	}
	} else {
	$fragments = array();
	foreach ($moves as $move) {
	+ $to_column = $move['columnPHID'];
	+ $board_phid = $move['boardPHID'];
	$fragments[] = pht(
	'%s (%s)',
	$this->renderHandleLink($board_phid),
	$this->renderHandleLink($to_column));
	}

	return pht(
	'%s moved %s on %s board(s): %s.',
	$this->renderHandleLink($author_phid),
	$this->renderHandleLink($object_phid),
	phutil_count($moves),
	phutil_implode_html(', ', $fragments));
	}
	break;

	case PhabricatorTransactions::TYPE_MFA:
	return null;

	}

	return $this->getTitle();
	}

	public function getMarkupFieldsForFeed(PhabricatorFeedStory $story) {
	$fields = array();

	switch ($this->getTransactionType()) {
	case PhabricatorTransactions::TYPE_COMMENT:
	$text = $this->getComment()->getContent();
	if (strlen($text)) {
	$fields[] = 'comment/'.$this->getID();
	}
	break;
	}

	return $fields;
	}

	public function getMarkupTextForFeed(PhabricatorFeedStory $story, $field) {
	switch ($this->getTransactionType()) {
	case PhabricatorTransactions::TYPE_COMMENT:
	$text = $this->getComment()->getContent();
	return PhabricatorMarkupEngine::summarize($text);
	}

	return null;
	}

	public function getBodyForFeed(PhabricatorFeedStory $story) {
	$remarkup = $this->getRemarkupBodyForFeed($story);
	if ($remarkup !== null) {
	$remarkup = PhabricatorMarkupEngine::summarize($remarkup);
	return new PHUIRemarkupView($this->viewer, $remarkup);
	}

	$old = $this->getOldValue();
	$new = $this->getNewValue();

	$body = null;

	switch ($this->getTransactionType()) {
	case PhabricatorTransactions::TYPE_COMMENT:
	$text = $this->getComment()->getContent();
	if (strlen($text)) {
	$body = $story->getMarkupFieldOutput('comment/'.$this->getID());
	}
	break;
	}

	return $body;
	}

	public function getRemarkupBodyForFeed(PhabricatorFeedStory $story) {
	return null;
	}

	public function getActionStrength() {
	if ($this->isInlineCommentTransaction()) {
	return 25;
	}

	switch ($this->getTransactionType()) {
	case PhabricatorTransactions::TYPE_COMMENT:
	return 50;
	case PhabricatorTransactions::TYPE_SUBSCRIBERS:
	if ($this->isSelfSubscription()) {
	// Make this weaker than TYPE_COMMENT.
	return 25;
	}

	// In other cases, subscriptions are more interesting than comments
	// (which are shown anyway) but less interesting than any other type of
	// transaction.
	return 75;
	case PhabricatorTransactions::TYPE_MFA:
	// We want MFA signatures to render at the top of transaction groups,
	// on top of the things they signed.
	return 1000;
	}

	return 100;
	}

	public function isCommentTransaction() {
	if ($this->hasComment()) {
	return true;
	}

	switch ($this->getTransactionType()) {
	case PhabricatorTransactions::TYPE_COMMENT:
	return true;
	}

	return false;
	}

	public function isInlineCommentTransaction() {
	return false;
	}

	public function getActionName() {
	switch ($this->getTransactionType()) {
	case PhabricatorTransactions::TYPE_COMMENT:
	return pht('Commented On');
	case PhabricatorTransactions::TYPE_VIEW_POLICY:
	case PhabricatorTransactions::TYPE_EDIT_POLICY:
	case PhabricatorTransactions::TYPE_JOIN_POLICY:
	case PhabricatorTransactions::TYPE_INTERACT_POLICY:
	return pht('Changed Policy');
	case PhabricatorTransactions::TYPE_SUBSCRIBERS:
	return pht('Changed Subscribers');
	default:
	return pht('Updated');
	}
	}

	public function getMailTags() {
	return array();
	}

	public function hasChangeDetails() {
	switch ($this->getTransactionType()) {
	case PhabricatorTransactions::TYPE_FILE:
	return true;
	case PhabricatorTransactions::TYPE_CUSTOMFIELD:
	$field = $this->getTransactionCustomField();
	if ($field) {
	return $field->getApplicationTransactionHasChangeDetails($this);
	}
	break;
	}
	return false;
	}

	public function hasChangeDetailsForMail() {
	return $this->hasChangeDetails();
	}

	public function renderChangeDetailsForMail(PhabricatorUser $viewer) {
	switch ($this->getTransactionType()) {
	case PhabricatorTransactions::TYPE_FILE:
	return false;
	}

	$view = $this->renderChangeDetails($viewer);
	if ($view instanceof PhabricatorApplicationTransactionTextDiffDetailView) {
	return $view->renderForMail();
	}
	return null;
	}

	public function renderChangeDetails(PhabricatorUser $viewer) {
	switch ($this->getTransactionType()) {
	case PhabricatorTransactions::TYPE_FILE:
	return $this->newFileTransactionChangeDetails($viewer);
	case PhabricatorTransactions::TYPE_CUSTOMFIELD:
	$field = $this->getTransactionCustomField();
	if ($field) {
	return $field->getApplicationTransactionChangeDetails($this, $viewer);
	}
	break;
	}

	return $this->renderTextCorpusChangeDetails(
	$viewer,
	$this->getOldValue(),
	$this->getNewValue());
	}

	public function renderTextCorpusChangeDetails(
	PhabricatorUser $viewer,
	$old,
	$new) {
	return id(new PhabricatorApplicationTransactionTextDiffDetailView())
	->setUser($viewer)
	->setOldText($old)
	->setNewText($new);
	}

	public function attachTransactionGroup(array $group) {
	assert_instances_of($group, __CLASS__);
	$this->transactionGroup = $group;
	return $this;
	}

	public function getTransactionGroup() {
	return $this->transactionGroup;
	}

	/**
	* Should this transaction be visually grouped with an existing transaction
	* group?
	*
	* @param list<PhabricatorApplicationTransaction> List of transactions.
	* @return bool True to display in a group with the other transactions.
	*/
	public function shouldDisplayGroupWith(array $group) {
	$this_source = null;
	if ($this->getContentSource()) {
	$this_source = $this->getContentSource()->getSource();
	}

	$type_mfa = PhabricatorTransactions::TYPE_MFA;

	foreach ($group as $xaction) {
	// Don't group transactions by different authors.
	if ($xaction->getAuthorPHID() != $this->getAuthorPHID()) {
	return false;
	}

	// Don't group transactions for different objects.
	if ($xaction->getObjectPHID() != $this->getObjectPHID()) {
	return false;
	}

	// Don't group anything into a group which already has a comment.
	if ($xaction->isCommentTransaction()) {
	return false;
	}

	// Don't group transactions from different content sources.
	$other_source = null;
	if ($xaction->getContentSource()) {
	$other_source = $xaction->getContentSource()->getSource();
	}

	if ($other_source != $this_source) {
	return false;
	}

	// Don't group transactions which happened more than 2 minutes apart.
	$apart = abs($xaction->getDateCreated() - $this->getDateCreated());
	if ($apart > (60 * 2)) {
	return false;
	}

	// Don't group silent and nonsilent transactions together.
	$is_silent = $this->getIsSilentTransaction();
	if ($is_silent != $xaction->getIsSilentTransaction()) {
	return false;
	}

	// Don't group MFA and non-MFA transactions together.
	$is_mfa = $this->getIsMFATransaction();
	if ($is_mfa != $xaction->getIsMFATransaction()) {
	return false;
	}

	// Don't group two "Sign with MFA" transactions together.
	if ($this->getTransactionType() === $type_mfa) {
	if ($xaction->getTransactionType() === $type_mfa) {
	return false;
	}
	}

	// Don't group lock override and non-override transactions together.
	$is_override = $this->getIsLockOverrideTransaction();
	if ($is_override != $xaction->getIsLockOverrideTransaction()) {
	return false;
	}
	}

	return true;
	}

	public function renderExtraInformationLink() {
	$herald_xscript_id = $this->getMetadataValue('herald:transcriptID');

	if ($herald_xscript_id) {
	return phutil_tag(
	'a',
	array(
	'href' => '/herald/transcript/'.$herald_xscript_id.'/',
	),
	pht('View Herald Transcript'));
	}

	return null;
	}

	public function renderAsTextForDoorkeeper(
	DoorkeeperFeedStoryPublisher $publisher,
	PhabricatorFeedStory $story,
	array $xactions) {

	$text = array();
	$body = array();

	foreach ($xactions as $xaction) {
	$xaction_body = $xaction->getBodyForMail();
	if ($xaction_body !== null) {
	$body[] = $xaction_body;
	}

	if ($xaction->shouldHideForMail($xactions)) {
	continue;
	}

	$old_target = $xaction->getRenderingTarget();
	$new_target = self::TARGET_TEXT;
	$xaction->setRenderingTarget($new_target);

	if ($publisher->getRenderWithImpliedContext()) {
	$text[] = $xaction->getTitle();
	} else {
	$text[] = $xaction->getTitleForFeed();
	}

	$xaction->setRenderingTarget($old_target);
	}

	$text = implode("\n", $text);
	$body = implode("\n\n", $body);

	return rtrim($text."\n\n".$body);
	}

	/**
	* Test if this transaction is just a user subscribing or unsubscribing
	* themselves.
	*/
	private function isSelfSubscription() {
	$type = $this->getTransactionType();
	if ($type != PhabricatorTransactions::TYPE_SUBSCRIBERS) {
	return false;
	}

	$old = $this->getOldValue();
	$new = $this->getNewValue();

	$add = array_diff($old, $new);
	$rem = array_diff($new, $old);

	if ((count($add) + count($rem)) != 1) {
	// More than one user affected.
	return false;
	}

	$affected_phid = head(array_merge($add, $rem));
	if ($affected_phid != $this->getAuthorPHID()) {
	// Affected user is someone else.
	return false;
	}

	return true;
	}

	private function isApplicationAuthor() {
	$author_phid = $this->getAuthorPHID();
	$author_type = phid_get_type($author_phid);
	$application_type = PhabricatorApplicationApplicationPHIDType::TYPECONST;
	return ($author_type == $application_type);
	}


	private function getInterestingMoves(array $moves) {
	// Remove moves which only shift the position of a task within a column.
	foreach ($moves as $key => $move) {
	$from_phids = array_fuse($move['fromColumnPHIDs']);
	if (isset($from_phids[$move['columnPHID']])) {
	unset($moves[$key]);
	}
	}

	return $moves;
	}

	private function getInterestingInlineStateChangeCounts() {
	// See PHI995. Newer inline state transactions have additional details
	// which we use to tailor the rendering behavior. These details are not
	// present on older transactions.
	$details = $this->getMetadataValue('inline.details', array());

	$new = $this->getNewValue();

	$done = 0;
	$undone = 0;
	foreach ($new as $phid => $state) {
	$is_done = ($state == PhabricatorInlineComment::STATE_DONE);

	// See PHI995. If you're marking your own inline comments as "Done",
	// don't count them when rendering a timeline story. In the case where
	// you're only affecting your own comments, this will hide the
	// "alice marked X comments as done" story entirely.

	// Usually, this happens when you pre-mark inlines as "done" and submit
	// them yourself. We'll still generate an "alice added inline comments"
	// story (in most cases/contexts), but the state change story is largely
	// just clutter and slightly confusing/misleading.

	$inline_details = idx($details, $phid, array());
	$inline_author_phid = idx($inline_details, 'authorPHID');
	if ($inline_author_phid) {
	if ($inline_author_phid == $this->getAuthorPHID()) {
	if ($is_done) {
	continue;
	}
	}
	}

	if ($is_done) {
	$done++;
	} else {
	$undone++;
	}
	}

	return array($done, $undone);
	}

	public function newGlobalSortVector() {
	return id(new PhutilSortVector())
	->addInt(-$this->getDateCreated())
	->addString($this->getPHID());
	}

	public function newActionStrengthSortVector() {
	return id(new PhutilSortVector())
	->addInt(-$this->getActionStrength());
	}

	private function newFileTransactionChangeDetails(PhabricatorUser $viewer) {
	$old = $this->getOldValue();
	$new = $this->getNewValue();

	$phids = array_keys($old + $new);
	$handles = $viewer->loadHandles($phids);

	$names = array(
	PhabricatorFileAttachment::MODE_REFERENCE => pht('Referenced'),
	PhabricatorFileAttachment::MODE_ATTACH => pht('Attached'),
	);

	$rows = array();
	foreach ($old + $new as $phid => $ignored) {
	$handle = $handles[$phid];

	$old_mode = idx($old, $phid);
	$new_mode = idx($new, $phid);

	if ($old_mode === null) {
	$old_name = pht('None');
	} else if (isset($names[$old_mode])) {
	$old_name = $names[$old_mode];
	} else {
	$old_name = pht('Unknown ("%s")', $old_mode);
	}

	if ($new_mode === null) {
	$new_name = pht('Detached');
	} else if (isset($names[$new_mode])) {
	$new_name = $names[$new_mode];
	} else {
	$new_name = pht('Unknown ("%s")', $new_mode);
	}

	$rows[] = array(
	$handle->renderLink(),
	$old_name,
	$new_name,
	);
	}

	$table = id(new AphrontTableView($rows))
	->setHeaders(
	array(
	pht('File'),
	pht('Old Mode'),
	pht('New Mode'),
	))
	->setColumnClasses(
	array(
	'pri',
	));

	return id(new PHUIBoxView())
	->addMargin(PHUI::MARGIN_SMALL)
	->appendChild($table);
	}



	/* -( PhabricatorPolicyInterface Implementation )-------------------------- */


	public function getCapabilities() {
	return array(
	PhabricatorPolicyCapability::CAN_VIEW,
	PhabricatorPolicyCapability::CAN_EDIT,
	);
	}

	public function getPolicy($capability) {
	switch ($capability) {
	case PhabricatorPolicyCapability::CAN_VIEW:
	return $this->getViewPolicy();
	case PhabricatorPolicyCapability::CAN_EDIT:
	return $this->getEditPolicy();
	}
	}

	public function hasAutomaticCapability($capability, PhabricatorUser $viewer) {
	return ($viewer->getPHID() == $this->getAuthorPHID());
	}

	public function describeAutomaticCapability($capability) {
	return pht(
	'Transactions are visible to users that can see the object which was '.
	'acted upon. Some transactions - in particular, comments - are '.
	'editable by the transaction author.');
	}

	public function getModularType() {
	return null;
	}

	public function setForceNotifyPHIDs(array $phids) {
	$this->setMetadataValue('notify.force', $phids);
	return $this;
	}

	public function getForceNotifyPHIDs() {
	return $this->getMetadataValue('notify.force', array());
	}


	/* -( PhabricatorDestructibleInterface )----------------------------------- */


	public function destroyObjectPermanently(
	PhabricatorDestructionEngine $engine) {

	$this->openTransaction();
	$comment_template = $this->getApplicationTransactionCommentObject();

	if ($comment_template) {
	$comments = $comment_template->loadAllWhere(
	'transactionPHID = %s',
	$this->getPHID());
	foreach ($comments as $comment) {
	$engine->destroyObject($comment);
	}
	}

	$this->delete();
	$this->saveTransaction();
	}

	}

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