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;
	}

	}