DifferentialChangesSinceLastUpdateField.php
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	<?php

	final class DifferentialChangesSinceLastUpdateField
	extends DifferentialCustomField {

	public function getFieldKey() {
	return 'differential:changes-since-last-update';
	}

	public function getFieldName() {
	return pht('Changes Since Last Update');
	}

	public function getFieldDescription() {
	return pht('Links to changes since the last update in email.');
	}

	public function shouldAppearInTransactionMail() {
	return true;
	}

	public function updateTransactionMailBody(
	PhabricatorMetaMTAMailBody $body,
	PhabricatorApplicationTransactionEditor $editor,
	array $xactions) {

	if ($editor->getIsNewObject()) {
	return;
	}

	if ($editor->getIsCloseByCommit()) {
	return;
	}

	$xaction = $editor->getDiffUpdateTransaction($xactions);
	if (!$xaction) {
	return;
	}

	$original = id(new DifferentialDiffQuery())
	->setViewer($this->getViewer())
	->withPHIDs(array($xaction->getOldValue()))
	->executeOne();
	if (!$original) {
	return;
	}

	$revision = $this->getObject();
	$current = $revision->getActiveDiff();

	$old_id = $original->getID();
	$new_id = $current->getID();

	$uri = '/'.$revision->getMonogram().'?vs='.$old_id.'&id='.$new_id;
	$uri = PhabricatorEnv::getProductionURI($uri);

	$body->addLinkSection(pht('CHANGES SINCE LAST UPDATE'), $uri);
	}

	}