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DifferentialTitleCommitMessageField.php
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			<?php

			final class DifferentialTitleCommitMessageField
			extends DifferentialCommitMessageField {

			const FIELDKEY = 'title';

			public function getFieldName() {
			return pht('Title');
			}

			public function getFieldOrder() {
			return 1000;
			}

			public static function getDefaultTitle() {
			return pht('<<Replace this line with your revision title>');
			}

			public function parseFieldValue($value) {
			if ($value === self::getDefaultTitle()) {
			$this->raiseParseException(
			pht(
			'Replace the default title line with a human-readable revision '.
			'title which describes the changes you are making.'));
			}

			return parent::parseFieldValue($value);
			}

			public function validateFieldValue($value) {
			if (!strlen($value)) {
			$this->raiseValidationException(
			pht(
			'You must provide a revision title in the first line '.
			'of your commit message.'));
			}
			}

			public function readFieldValueFromObject(DifferentialRevision $revision) {
			$value = $revision->getTitle();

			if (!strlen($value)) {
			return self::getDefaultTitle();
			}

			return $value;
			}

			public function getFieldTransactions($value) {
			return array(
			array(
			'type' => DifferentialRevisionTitleTransaction::EDITKEY,
			'value' => $value,
			),
			);
			}

			}