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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->isFirstBroadcast()) {
			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);
			}

			}