ManiphestTransaction.php
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Created: Mon, Aug 19, 16:21

ManiphestTransaction.php
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	<?php

	final class ManiphestTransaction
	extends PhabricatorApplicationTransaction {

	const TYPE_TITLE = 'title';
	const TYPE_STATUS = 'status';
	const TYPE_DESCRIPTION = 'description';
	const TYPE_OWNER = 'reassign';
	const TYPE_PRIORITY = 'priority';
	const TYPE_EDGE = 'edge';
	const TYPE_SUBPRIORITY = 'subpriority';
	const TYPE_PROJECT_COLUMN = 'projectcolumn';
	const TYPE_MERGED_INTO = 'mergedinto';
	const TYPE_MERGED_FROM = 'mergedfrom';
	const TYPE_UNBLOCK = 'unblock';
	const TYPE_PARENT = 'parent';
	const TYPE_COLUMN = 'column';
	const TYPE_COVER_IMAGE = 'cover-image';
	const TYPE_POINTS = 'points';

	// NOTE: this type is deprecated. Keep it around for legacy installs
	// so any transactions render correctly.
	const TYPE_ATTACH = 'attach';

	const MAILTAG_STATUS = 'maniphest-status';
	const MAILTAG_OWNER = 'maniphest-owner';
	const MAILTAG_PRIORITY = 'maniphest-priority';
	const MAILTAG_CC = 'maniphest-cc';
	const MAILTAG_PROJECTS = 'maniphest-projects';
	const MAILTAG_COMMENT = 'maniphest-comment';
	const MAILTAG_COLUMN = 'maniphest-column';
	const MAILTAG_UNBLOCK = 'maniphest-unblock';
	const MAILTAG_OTHER = 'maniphest-other';


	public function getApplicationName() {
	return 'maniphest';
	}

	public function getApplicationTransactionType() {
	return ManiphestTaskPHIDType::TYPECONST;
	}

	public function getApplicationTransactionCommentObject() {
	return new ManiphestTransactionComment();
	}

	public function shouldGenerateOldValue() {
	switch ($this->getTransactionType()) {
	case self::TYPE_PROJECT_COLUMN:
	case self::TYPE_EDGE:
	case self::TYPE_UNBLOCK:
	return false;
	}

	return parent::shouldGenerateOldValue();
	}

	public function getRemarkupBlocks() {
	$blocks = parent::getRemarkupBlocks();

	switch ($this->getTransactionType()) {
	case self::TYPE_DESCRIPTION:
	$blocks[] = $this->getNewValue();
	break;
	}

	return $blocks;
	}

	public function getRequiredHandlePHIDs() {
	$phids = parent::getRequiredHandlePHIDs();

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

	switch ($this->getTransactionType()) {
	case self::TYPE_OWNER:
	if ($new) {
	$phids[] = $new;
	}

	if ($old) {
	$phids[] = $old;
	}
	break;
	case self::TYPE_PROJECT_COLUMN:
	$phids[] = $new['projectPHID'];
	$phids[] = head($new['columnPHIDs']);
	break;
	case self::TYPE_MERGED_INTO:
	$phids[] = $new;
	break;
	case self::TYPE_MERGED_FROM:
	$phids = array_merge($phids, $new);
	break;
	case self::TYPE_EDGE:
	$phids = array_mergev(
	array(
	$phids,
	array_keys(nonempty($old, array())),
	array_keys(nonempty($new, array())),
	));
	break;
	case self::TYPE_ATTACH:
	$old = nonempty($old, array());
	$new = nonempty($new, array());
	$phids = array_mergev(
	array(
	$phids,
	array_keys(idx($new, 'FILE', array())),
	array_keys(idx($old, 'FILE', array())),
	));
	break;
	case self::TYPE_UNBLOCK:
	foreach (array_keys($new) as $phid) {
	$phids[] = $phid;
	}
	break;
	case self::TYPE_STATUS:
	$commit_phid = $this->getMetadataValue('commitPHID');
	if ($commit_phid) {
	$phids[] = $commit_phid;
	}
	break;
	}

	return $phids;
	}

	public function shouldHide() {
	switch ($this->getTransactionType()) {
	case PhabricatorTransactions::TYPE_EDGE:
	$commit_phid = $this->getMetadataValue('commitPHID');
	$edge_type = $this->getMetadataValue('edge:type');

	if ($edge_type == ManiphestTaskHasCommitEdgeType::EDGECONST) {
	if ($commit_phid) {
	return true;
	}
	}
	break;
	case self::TYPE_DESCRIPTION:
	case self::TYPE_PRIORITY:
	case self::TYPE_STATUS:
	if ($this->getOldValue() === null) {
	return true;
	} else {
	return false;
	}
	break;
	case self::TYPE_SUBPRIORITY:
	case self::TYPE_PARENT:
	case self::TYPE_COLUMN:
	return true;
	case self::TYPE_PROJECT_COLUMN:
	$old_cols = idx($this->getOldValue(), 'columnPHIDs');
	$new_cols = idx($this->getNewValue(), 'columnPHIDs');

	$old_cols = array_values($old_cols);
	$new_cols = array_values($new_cols);
	sort($old_cols);
	sort($new_cols);

	return ($old_cols === $new_cols);
	case self::TYPE_COVER_IMAGE:
	// At least for now, don't show these.
	return true;
	case self::TYPE_POINTS:
	if (!ManiphestTaskPoints::getIsEnabled()) {
	return true;
	}
	}

	return parent::shouldHide();
	}

	public function shouldHideForMail(array $xactions) {
	switch ($this->getTransactionType()) {
	case self::TYPE_POINTS:
	return true;
	}

	return parent::shouldHideForMail($xactions);
	}

	public function shouldHideForFeed() {
	switch ($this->getTransactionType()) {
	case self::TYPE_UNBLOCK:
	// Hide "alice created X, a task blocking Y." from feed because it
	// will almost always appear adjacent to "alice created Y".
	$is_new = $this->getMetadataValue('blocker.new');
	if ($is_new) {
	return true;
	}
	break;
	case self::TYPE_POINTS:
	return true;
	}

	return parent::shouldHideForFeed();
	}

	public function getActionStrength() {
	switch ($this->getTransactionType()) {
	case self::TYPE_TITLE:
	return 1.4;
	case self::TYPE_STATUS:
	return 1.3;
	case self::TYPE_OWNER:
	return 1.2;
	case self::TYPE_PRIORITY:
	return 1.1;
	}

	return parent::getActionStrength();
	}


	public function getColor() {
	$old = $this->getOldValue();
	$new = $this->getNewValue();

	switch ($this->getTransactionType()) {
	case self::TYPE_OWNER:
	if ($this->getAuthorPHID() == $new) {
	return 'green';
	} else if (!$new) {
	return 'black';
	} else if (!$old) {
	return 'green';
	} else {
	return 'green';
	}

	case self::TYPE_STATUS:
	$color = ManiphestTaskStatus::getStatusColor($new);
	if ($color !== null) {
	return $color;
	}

	if (ManiphestTaskStatus::isOpenStatus($new)) {
	return 'green';
	} else {
	return 'indigo';
	}

	case self::TYPE_PRIORITY:
	if ($old == ManiphestTaskPriority::getDefaultPriority()) {
	return 'green';
	} else if ($old > $new) {
	return 'grey';
	} else {
	return 'yellow';
	}

	case self::TYPE_MERGED_FROM:
	return 'orange';

	case self::TYPE_MERGED_INTO:
	return 'indigo';
	}

	return parent::getColor();
	}

	public function getActionName() {
	$old = $this->getOldValue();
	$new = $this->getNewValue();

	switch ($this->getTransactionType()) {
	case self::TYPE_TITLE:
	if ($old === null) {
	return pht('Created');
	}

	return pht('Retitled');

	case self::TYPE_STATUS:
	$action = ManiphestTaskStatus::getStatusActionName($new);
	if ($action) {
	return $action;
	}

	$old_closed = ManiphestTaskStatus::isClosedStatus($old);
	$new_closed = ManiphestTaskStatus::isClosedStatus($new);

	if ($new_closed && !$old_closed) {
	return pht('Closed');
	} else if (!$new_closed && $old_closed) {
	return pht('Reopened');
	} else {
	return pht('Changed Status');
	}

	case self::TYPE_DESCRIPTION:
	return pht('Edited');

	case self::TYPE_OWNER:
	if ($this->getAuthorPHID() == $new) {
	return pht('Claimed');
	} else if (!$new) {
	return pht('Unassigned');
	} else if (!$old) {
	return pht('Assigned');
	} else {
	return pht('Reassigned');
	}

	case self::TYPE_PROJECT_COLUMN:
	return pht('Changed Project Column');

	case self::TYPE_PRIORITY:
	if ($old == ManiphestTaskPriority::getDefaultPriority()) {
	return pht('Triaged');
	} else if ($old > $new) {
	return pht('Lowered Priority');
	} else {
	return pht('Raised Priority');
	}

	case self::TYPE_EDGE:
	case self::TYPE_ATTACH:
	return pht('Attached');

	case self::TYPE_UNBLOCK:
	$old_status = head($old);
	$new_status = head($new);

	$old_closed = ManiphestTaskStatus::isClosedStatus($old_status);
	$new_closed = ManiphestTaskStatus::isClosedStatus($new_status);

	if ($old_closed && !$new_closed) {
	return pht('Block');
	} else if (!$old_closed && $new_closed) {
	return pht('Unblock');
	} else {
	return pht('Blocker');
	}

	case self::TYPE_MERGED_INTO:
	case self::TYPE_MERGED_FROM:
	return pht('Merged');

	}

	return parent::getActionName();
	}

	public function getIcon() {
	$old = $this->getOldValue();
	$new = $this->getNewValue();

	switch ($this->getTransactionType()) {
	case self::TYPE_OWNER:
	return 'fa-user';

	case self::TYPE_TITLE:
	if ($old === null) {
	return 'fa-pencil';
	}

	return 'fa-pencil';

	case self::TYPE_STATUS:
	$action = ManiphestTaskStatus::getStatusIcon($new);
	if ($action !== null) {
	return $action;
	}

	if (ManiphestTaskStatus::isClosedStatus($new)) {
	return 'fa-check';
	} else {
	return 'fa-pencil';
	}

	case self::TYPE_DESCRIPTION:
	return 'fa-pencil';

	case self::TYPE_PROJECT_COLUMN:
	return 'fa-columns';

	case self::TYPE_MERGED_INTO:
	return 'fa-check';
	case self::TYPE_MERGED_FROM:
	return 'fa-compress';

	case self::TYPE_PRIORITY:
	if ($old == ManiphestTaskPriority::getDefaultPriority()) {
	return 'fa-arrow-right';
	} else if ($old > $new) {
	return 'fa-arrow-down';
	} else {
	return 'fa-arrow-up';
	}

	case self::TYPE_EDGE:
	case self::TYPE_ATTACH:
	return 'fa-thumb-tack';

	case self::TYPE_UNBLOCK:
	return 'fa-shield';

	}

	return parent::getIcon();
	}



	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 task.',
	$this->renderHandleLink($author_phid));

	case self::TYPE_TITLE:
	if ($old === null) {
	return pht(
	'%s created this task.',
	$this->renderHandleLink($author_phid));
	}
	return pht(
	'%s changed the title from "%s" to "%s".',
	$this->renderHandleLink($author_phid),
	$old,
	$new);

	case self::TYPE_DESCRIPTION:
	return pht(
	'%s edited the task description.',
	$this->renderHandleLink($author_phid));

	case self::TYPE_STATUS:
	$old_closed = ManiphestTaskStatus::isClosedStatus($old);
	$new_closed = ManiphestTaskStatus::isClosedStatus($new);

	$old_name = ManiphestTaskStatus::getTaskStatusName($old);
	$new_name = ManiphestTaskStatus::getTaskStatusName($new);

	$commit_phid = $this->getMetadataValue('commitPHID');

	if ($new_closed && !$old_closed) {
	if ($new == ManiphestTaskStatus::getDuplicateStatus()) {
	if ($commit_phid) {
	return pht(
	'%s closed this task as a duplicate by committing %s.',
	$this->renderHandleLink($author_phid),
	$this->renderHandleLink($commit_phid));
	} else {
	return pht(
	'%s closed this task as a duplicate.',
	$this->renderHandleLink($author_phid));
	}
	} else {
	if ($commit_phid) {
	return pht(
	'%s closed this task as "%s" by committing %s.',
	$this->renderHandleLink($author_phid),
	$new_name,
	$this->renderHandleLink($commit_phid));
	} else {
	return pht(
	'%s closed this task as "%s".',
	$this->renderHandleLink($author_phid),
	$new_name);
	}
	}
	} else if (!$new_closed && $old_closed) {
	if ($commit_phid) {
	return pht(
	'%s reopened this task as "%s" by committing %s.',
	$this->renderHandleLink($author_phid),
	$new_name,
	$this->renderHandleLink($commit_phid));
	} else {
	return pht(
	'%s reopened this task as "%s".',
	$this->renderHandleLink($author_phid),
	$new_name);
	}
	} else {
	if ($commit_phid) {
	return pht(
	'%s changed the task status from "%s" to "%s" by committing %s.',
	$this->renderHandleLink($author_phid),
	$old_name,
	$new_name,
	$this->renderHandleLink($commit_phid));
	} else {
	return pht(
	'%s changed the task status from "%s" to "%s".',
	$this->renderHandleLink($author_phid),
	$old_name,
	$new_name);
	}
	}

	case self::TYPE_UNBLOCK:
	$blocker_phid = key($new);
	$old_status = head($old);
	$new_status = head($new);

	$old_closed = ManiphestTaskStatus::isClosedStatus($old_status);
	$new_closed = ManiphestTaskStatus::isClosedStatus($new_status);

	$old_name = ManiphestTaskStatus::getTaskStatusName($old_status);
	$new_name = ManiphestTaskStatus::getTaskStatusName($new_status);

	if ($this->getMetadataValue('blocker.new')) {
	return pht(
	'%s created blocking task %s.',
	$this->renderHandleLink($author_phid),
	$this->renderHandleLink($blocker_phid));
	} else if ($old_closed && !$new_closed) {
	return pht(
	'%s reopened blocking task %s as "%s".',
	$this->renderHandleLink($author_phid),
	$this->renderHandleLink($blocker_phid),
	$new_name);
	} else if (!$old_closed && $new_closed) {
	return pht(
	'%s closed blocking task %s as "%s".',
	$this->renderHandleLink($author_phid),
	$this->renderHandleLink($blocker_phid),
	$new_name);
	} else {
	return pht(
	'%s changed the status of blocking task %s from "%s" to "%s".',
	$this->renderHandleLink($author_phid),
	$this->renderHandleLink($blocker_phid),
	$old_name,
	$new_name);
	}

	case self::TYPE_OWNER:
	if ($author_phid == $new) {
	return pht(
	'%s claimed this task.',
	$this->renderHandleLink($author_phid));
	} else if (!$new) {
	return pht(
	'%s removed %s as the assignee of this task.',
	$this->renderHandleLink($author_phid),
	$this->renderHandleLink($old));
	} else if (!$old) {
	return pht(
	'%s assigned this task to %s.',
	$this->renderHandleLink($author_phid),
	$this->renderHandleLink($new));
	} else {
	return pht(
	'%s reassigned this task from %s to %s.',
	$this->renderHandleLink($author_phid),
	$this->renderHandleLink($old),
	$this->renderHandleLink($new));
	}

	case self::TYPE_PRIORITY:
	$old_name = ManiphestTaskPriority::getTaskPriorityName($old);
	$new_name = ManiphestTaskPriority::getTaskPriorityName($new);

	if ($old == ManiphestTaskPriority::getDefaultPriority()) {
	return pht(
	'%s triaged this task as "%s" priority.',
	$this->renderHandleLink($author_phid),
	$new_name);
	} else if ($old > $new) {
	return pht(
	'%s lowered the priority of this task from "%s" to "%s".',
	$this->renderHandleLink($author_phid),
	$old_name,
	$new_name);
	} else {
	return pht(
	'%s raised the priority of this task from "%s" to "%s".',
	$this->renderHandleLink($author_phid),
	$old_name,
	$new_name);
	}

	case self::TYPE_ATTACH:
	$old = nonempty($old, array());
	$new = nonempty($new, array());
	$new = array_keys(idx($new, 'FILE', array()));
	$old = array_keys(idx($old, 'FILE', array()));

	$added = array_diff($new, $old);
	$removed = array_diff($old, $new);
	if ($added && !$removed) {
	return pht(
	'%s attached %s file(s): %s.',
	$this->renderHandleLink($author_phid),
	phutil_count($added),
	$this->renderHandleList($added));
	} else if ($removed && !$added) {
	return pht(
	'%s detached %s file(s): %s.',
	$this->renderHandleLink($author_phid),
	phutil_count($removed),
	$this->renderHandleList($removed));
	} else {
	return pht(
	'%s changed file(s), attached %s: %s; detached %s: %s.',
	$this->renderHandleLink($author_phid),
	phutil_count($added),
	$this->renderHandleList($added),
	phutil_count($removed),
	$this->renderHandleList($removed));
	}

	case self::TYPE_PROJECT_COLUMN:
	$project_phid = $new['projectPHID'];
	$column_phid = head($new['columnPHIDs']);
	return pht(
	'%s moved this task to %s on the %s workboard.',
	$this->renderHandleLink($author_phid),
	$this->renderHandleLink($column_phid),
	$this->renderHandleLink($project_phid));
	break;

	case self::TYPE_MERGED_INTO:
	return pht(
	'%s closed this task as a duplicate of %s.',
	$this->renderHandleLink($author_phid),
	$this->renderHandleLink($new));
	break;

	case self::TYPE_MERGED_FROM:
	return pht(
	'%s merged %s task(s): %s.',
	$this->renderHandleLink($author_phid),
	phutil_count($new),
	$this->renderHandleList($new));
	break;

	case self::TYPE_POINTS:
	if ($old === null) {
	return pht(
	'%s set the point value for this task to %s.',
	$this->renderHandleLink($author_phid),
	$new);
	} else if ($new === null) {
	return pht(
	'%s removed the point value for this task.',
	$this->renderHandleLink($author_phid));
	} else {
	return pht(
	'%s changed the point value for this task from %s to %s.',
	$this->renderHandleLink($author_phid),
	$old,
	$new);
	}

	}

	return parent::getTitle();
	}

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

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

	switch ($this->getTransactionType()) {
	case self::TYPE_TITLE:
	if ($old === null) {
	return pht(
	'%s created %s.',
	$this->renderHandleLink($author_phid),
	$this->renderHandleLink($object_phid));
	}

	return pht(
	'%s renamed %s from "%s" to "%s".',
	$this->renderHandleLink($author_phid),
	$this->renderHandleLink($object_phid),
	$old,
	$new);

	case self::TYPE_DESCRIPTION:
	return pht(
	'%s edited the description of %s.',
	$this->renderHandleLink($author_phid),
	$this->renderHandleLink($object_phid));

	case self::TYPE_STATUS:
	$old_closed = ManiphestTaskStatus::isClosedStatus($old);
	$new_closed = ManiphestTaskStatus::isClosedStatus($new);

	$old_name = ManiphestTaskStatus::getTaskStatusName($old);
	$new_name = ManiphestTaskStatus::getTaskStatusName($new);

	$commit_phid = $this->getMetadataValue('commitPHID');

	if ($new_closed && !$old_closed) {
	if ($new == ManiphestTaskStatus::getDuplicateStatus()) {
	if ($commit_phid) {
	return pht(
	'%s closed %s as a duplicate by committing %s.',
	$this->renderHandleLink($author_phid),
	$this->renderHandleLink($object_phid),
	$this->renderHandleLink($commit_phid));
	} else {
	return pht(
	'%s closed %s as a duplicate.',
	$this->renderHandleLink($author_phid),
	$this->renderHandleLink($object_phid));
	}
	} else {
	if ($commit_phid) {
	return pht(
	'%s closed %s as "%s" by committing %s.',
	$this->renderHandleLink($author_phid),
	$this->renderHandleLink($object_phid),
	$new_name,
	$this->renderHandleLink($commit_phid));
	} else {
	return pht(
	'%s closed %s as "%s".',
	$this->renderHandleLink($author_phid),
	$this->renderHandleLink($object_phid),
	$new_name);
	}
	}
	} else if (!$new_closed && $old_closed) {
	if ($commit_phid) {
	return pht(
	'%s reopened %s as "%s" by committing %s.',
	$this->renderHandleLink($author_phid),
	$this->renderHandleLink($object_phid),
	$new_name,
	$this->renderHandleLink($commit_phid));
	} else {
	return pht(
	'%s reopened %s as "%s".',
	$this->renderHandleLink($author_phid),
	$this->renderHandleLink($object_phid),
	$new_name);
	}
	} else {
	if ($commit_phid) {
	return pht(
	'%s changed the status of %s from "%s" to "%s" by committing %s.',
	$this->renderHandleLink($author_phid),
	$this->renderHandleLink($object_phid),
	$old_name,
	$new_name,
	$this->renderHandleLink($commit_phid));
	} else {
	return pht(
	'%s changed the status of %s from "%s" to "%s".',
	$this->renderHandleLink($author_phid),
	$this->renderHandleLink($object_phid),
	$old_name,
	$new_name);
	}
	}

	case self::TYPE_UNBLOCK:
	$blocker_phid = key($new);
	$old_status = head($old);
	$new_status = head($new);

	$old_closed = ManiphestTaskStatus::isClosedStatus($old_status);
	$new_closed = ManiphestTaskStatus::isClosedStatus($new_status);

	$old_name = ManiphestTaskStatus::getTaskStatusName($old_status);
	$new_name = ManiphestTaskStatus::getTaskStatusName($new_status);

	if ($old_closed && !$new_closed) {
	return pht(
	'%s reopened %s, a task blocking %s, as "%s".',
	$this->renderHandleLink($author_phid),
	$this->renderHandleLink($blocker_phid),
	$this->renderHandleLink($object_phid),
	$new_name);
	} else if (!$old_closed && $new_closed) {
	return pht(
	'%s closed %s, a task blocking %s, as "%s".',
	$this->renderHandleLink($author_phid),
	$this->renderHandleLink($blocker_phid),
	$this->renderHandleLink($object_phid),
	$new_name);
	} else {
	return pht(
	'%s changed the status of %s, a task blocking %s, '.
	'from "%s" to "%s".',
	$this->renderHandleLink($author_phid),
	$this->renderHandleLink($blocker_phid),
	$this->renderHandleLink($object_phid),
	$old_name,
	$new_name);
	}

	case self::TYPE_OWNER:
	if ($author_phid == $new) {
	return pht(
	'%s claimed %s.',
	$this->renderHandleLink($author_phid),
	$this->renderHandleLink($object_phid));
	} else if (!$new) {
	return pht(
	'%s placed %s up for grabs.',
	$this->renderHandleLink($author_phid),
	$this->renderHandleLink($object_phid));
	} else if (!$old) {
	return pht(
	'%s assigned %s to %s.',
	$this->renderHandleLink($author_phid),
	$this->renderHandleLink($object_phid),
	$this->renderHandleLink($new));
	} else {
	return pht(
	'%s reassigned %s from %s to %s.',
	$this->renderHandleLink($author_phid),
	$this->renderHandleLink($object_phid),
	$this->renderHandleLink($old),
	$this->renderHandleLink($new));
	}

	case self::TYPE_PRIORITY:
	$old_name = ManiphestTaskPriority::getTaskPriorityName($old);
	$new_name = ManiphestTaskPriority::getTaskPriorityName($new);

	if ($old == ManiphestTaskPriority::getDefaultPriority()) {
	return pht(
	'%s triaged %s as "%s" priority.',
	$this->renderHandleLink($author_phid),
	$this->renderHandleLink($object_phid),
	$new_name);
	} else if ($old > $new) {
	return pht(
	'%s lowered the priority of %s from "%s" to "%s".',
	$this->renderHandleLink($author_phid),
	$this->renderHandleLink($object_phid),
	$old_name,
	$new_name);
	} else {
	return pht(
	'%s raised the priority of %s from "%s" to "%s".',
	$this->renderHandleLink($author_phid),
	$this->renderHandleLink($object_phid),
	$old_name,
	$new_name);
	}

	case self::TYPE_ATTACH:
	$old = nonempty($old, array());
	$new = nonempty($new, array());
	$new = array_keys(idx($new, 'FILE', array()));
	$old = array_keys(idx($old, 'FILE', array()));

	$added = array_diff($new, $old);
	$removed = array_diff($old, $new);
	if ($added && !$removed) {
	return pht(
	'%s attached %d file(s) of %s: %s',
	$this->renderHandleLink($author_phid),
	$this->renderHandleLink($object_phid),
	count($added),
	$this->renderHandleList($added));
	} else if ($removed && !$added) {
	return pht(
	'%s detached %d file(s) of %s: %s',
	$this->renderHandleLink($author_phid),
	$this->renderHandleLink($object_phid),
	count($removed),
	$this->renderHandleList($removed));
	} else {
	return pht(
	'%s changed file(s) for %s, attached %d: %s; detached %d: %s',
	$this->renderHandleLink($author_phid),
	$this->renderHandleLink($object_phid),
	count($added),
	$this->renderHandleList($added),
	count($removed),
	$this->renderHandleList($removed));
	}

	case self::TYPE_PROJECT_COLUMN:
	$project_phid = $new['projectPHID'];
	$column_phid = head($new['columnPHIDs']);
	return pht(
	'%s moved %s to %s on the %s workboard.',
	$this->renderHandleLink($author_phid),
	$this->renderHandleLink($object_phid),
	$this->renderHandleLink($column_phid),
	$this->renderHandleLink($project_phid));

	case self::TYPE_MERGED_INTO:
	return pht(
	'%s merged task %s into %s.',
	$this->renderHandleLink($author_phid),
	$this->renderHandleLink($object_phid),
	$this->renderHandleLink($new));

	case self::TYPE_MERGED_FROM:
	return pht(
	'%s merged %s task(s) %s into %s.',
	$this->renderHandleLink($author_phid),
	phutil_count($new),
	$this->renderHandleList($new),
	$this->renderHandleLink($object_phid));

	}

	return parent::getTitleForFeed();
	}

	public function hasChangeDetails() {
	switch ($this->getTransactionType()) {
	case self::TYPE_DESCRIPTION:
	return true;
	}
	return parent::hasChangeDetails();
	}

	public function renderChangeDetails(PhabricatorUser $viewer) {
	return $this->renderTextCorpusChangeDetails(
	$viewer,
	$this->getOldValue(),
	$this->getNewValue());
	}

	public function getMailTags() {
	$tags = array();
	switch ($this->getTransactionType()) {
	case self::TYPE_MERGED_INTO:
	case self::TYPE_STATUS:
	$tags[] = self::MAILTAG_STATUS;
	break;
	case self::TYPE_OWNER:
	$tags[] = self::MAILTAG_OWNER;
	break;
	case PhabricatorTransactions::TYPE_SUBSCRIBERS:
	$tags[] = self::MAILTAG_CC;
	break;
	case PhabricatorTransactions::TYPE_EDGE:
	switch ($this->getMetadataValue('edge:type')) {
	case PhabricatorProjectObjectHasProjectEdgeType::EDGECONST:
	$tags[] = self::MAILTAG_PROJECTS;
	break;
	default:
	$tags[] = self::MAILTAG_OTHER;
	break;
	}
	break;
	case self::TYPE_PRIORITY:
	$tags[] = self::MAILTAG_PRIORITY;
	break;
	case self::TYPE_UNBLOCK:
	$tags[] = self::MAILTAG_UNBLOCK;
	break;
	case self::TYPE_PROJECT_COLUMN:
	$tags[] = self::MAILTAG_COLUMN;
	break;
	case PhabricatorTransactions::TYPE_COMMENT:
	$tags[] = self::MAILTAG_COMMENT;
	break;
	default:
	$tags[] = self::MAILTAG_OTHER;
	break;
	}
	return $tags;
	}

	public function getNoEffectDescription() {

	switch ($this->getTransactionType()) {
	case self::TYPE_STATUS:
	return pht('The task already has the selected status.');
	case self::TYPE_OWNER:
	return pht('The task already has the selected owner.');
	case self::TYPE_PRIORITY:
	return pht('The task already has the selected priority.');
	}

	return parent::getNoEffectDescription();
	}

	}

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