PhabricatorCommentEditEngineExtension.php
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	<?php

	final class PhabricatorCommentEditEngineExtension
	extends PhabricatorEditEngineExtension {

	const EXTENSIONKEY = 'transactions.comment';
	const EDITKEY = 'comment';

	public function getExtensionPriority() {
	return 9000;
	}

	public function isExtensionEnabled() {
	return true;
	}

	public function getExtensionName() {
	return pht('Comments');
	}

	public function supportsObject(
	PhabricatorEditEngine $engine,
	PhabricatorApplicationTransactionInterface $object) {

	$xaction = $object->getApplicationTransactionTemplate();

	try {
	$comment = $xaction->getApplicationTransactionCommentObject();
	} catch (PhutilMethodNotImplementedException $ex) {
	$comment = null;
	}

	return (bool)$comment;
	}

	public function buildCustomEditFields(
	PhabricatorEditEngine $engine,
	PhabricatorApplicationTransactionInterface $object) {

	$comment_type = PhabricatorTransactions::TYPE_COMMENT;

	// Comments have a lot of special behavior which doesn't always check
	// this flag, but we set it for consistency.
	$is_interact = true;

	$comment_field = id(new PhabricatorCommentEditField())
	->setKey(self::EDITKEY)
	->setLabel(pht('Comments'))
	->setAliases(array('comments'))
	->setIsHidden(true)
	->setIsReorderable(false)
	->setIsDefaultable(false)
	->setIsLockable(false)
	->setCanApplyWithoutEditCapability($is_interact)
	->setTransactionType($comment_type)
	->setConduitDescription(pht('Make comments.'))
	->setConduitTypeDescription(
	pht('Comment to add, formatted as remarkup.'))
	->setValue(null);

	return array(
	$comment_field,
	);
	}

	}