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PhabricatorProjectHovercardEngineExtension.php
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			<?php

			final class PhabricatorProjectHovercardEngineExtension
			extends PhabricatorHovercardEngineExtension {

			const EXTENSIONKEY = 'project.card';

			public function isExtensionEnabled() {
			return true;
			}

			public function getExtensionName() {
			return pht('Project Card');
			}

			public function canRenderObjectHovercard($object) {
			return ($object instanceof PhabricatorProject);
			}

			public function willRenderHovercards(array $objects) {
			$viewer = $this->getViewer();
			$phids = mpull($objects, 'getPHID');

			$projects = id(new PhabricatorProjectQuery())
			->setViewer($viewer)
			->withPHIDs($phids)
			->needImages(true)
			->execute();
			$projects = mpull($projects, null, 'getPHID');

			$custom_fields = array();
			foreach ($projects as $project) {
			$field = PhabricatorCustomField::getObjectField(
			$project,
			PhabricatorCustomField::ROLE_VIEW,
			'std:project:internal:description');
			if ($field === null) {
			// This means the field is disabled, it would always be null.
			break;
			}
			$field
			->setViewer($viewer)
			->readValueFromObject($project);
			$custom_fields[] = $field;
			}

			id(new PhabricatorCustomFieldStorageQuery())
			->addFields($custom_fields)
			->execute();

			return array(
			'projects' => $projects,
			);
			}

			public function renderHovercard(
			PHUIHovercardView $hovercard,
			PhabricatorObjectHandle $handle,
			$object,
			$data) {
			$viewer = $this->getViewer();

			$project = idx($data['projects'], $object->getPHID());
			if (!$project) {
			return;
			}

			$project_card = id(new PhabricatorProjectCardView())
			->setProject($project)
			->setViewer($viewer);

			$hovercard->appendChild($project_card);
			}

			}