1 files changed, 113 insertions, 0 deletions
diff --git a/www/wiki/extensions/SemanticMediaWiki/src/MediaWiki/Hooks/ArticleViewHeader.php b/www/wiki/extensions/SemanticMediaWiki/src/MediaWiki/Hooks/ArticleViewHeader.php
new file mode 100644
index 00000000..962adc78
--- /dev/null
+++ b/www/wiki/extensions/SemanticMediaWiki/src/MediaWiki/Hooks/ArticleViewHeader.php
@@ -0,0 +1,113 @@
+<?php
+
+namespace SMW\MediaWiki\Hooks;
+
+use Html;
+use Page;
+use SMW\DIProperty;
+use SMW\DIWikiPage;
+use SMW\MediaWiki\Jobs\ChangePropagationDispatchJob;
+use SMW\Message;
+use SMW\Store;
+use Title;
+
+/**
+ * @see https://www.mediawiki.org/wiki/Manual:Hooks/ArticleViewHeader
+ *
+ * @license GNU GPL v2+
+ * @since 3.0
+ *
+ * @author mwjames
+ */
+class ArticleViewHeader extends HookHandler {
+
+	/**
+	 * @var Store
+	 */
+	private $store;
+
+	/**
+	 * @since 3.0
+	 *
+	 * @param Page $page
+	 */
+	public function __construct( Store $store  ) {
+		$this->store = $store;
+	}
+
+	/**
+	 * @since 3.0
+	 *
+	 * @param Page $page
+	 * @param boolean &$outputDone
+	 * @param boolean &$useParserCache
+	 */
+	public function process( Page $page, &$outputDone, &$useParserCache ) {
+
+		$title = $page->getTitle();
+
+		$changePropagationWatchlist = array_flip(
+			$this->getOption( 'smwgChangePropagationWatchlist', [] )
+		);
+
+		// Only act when `_SUBC` is maintained as watchable property
+		if ( isset( $changePropagationWatchlist['_SUBC'] ) && $title->getNamespace() === NS_CATEGORY ) {
+			$useParserCache = $this->updateCategoryTop( $title, $page->getContext()->getOutput() );
+		}
+
+		return true;
+	}
+
+	private function updateCategoryTop( $title, $output ) {
+
+		$message = '';
+
+		$subject = DIWikiPage::newFromTitle(
+			$title
+		);
+
+		$semanticData = $this->store->getSemanticData(
+			$subject
+		);
+
+		if ( $semanticData->hasProperty( new DIProperty( DIProperty::TYPE_CHANGE_PROP ) ) ) {
+			$severity = $this->getOption( 'smwgChangePropagationProtection', true ) ? 'error' : 'warning';
+
+			$message .= $this->message(
+				$severity,
+				[
+					'smw-category-change-propagation-locked-' . $severity,
+					str_replace( '_', ' ', $subject->getDBKey() )
+				]
+			);
+		}
+
+		if ( $message === '' && ChangePropagationDispatchJob::hasPendingJobs( $subject ) ) {
+			$message .= $this->message(
+				'warning',
+				[
+					'smw-category-change-propagation-pending',
+					ChangePropagationDispatchJob::getPendingJobsCount( $subject )
+				]
+			);
+		}
+
+		$output->addHTML( $message );
+
+		// No Message means `useParserCache`otherwise refresh the output to
+		// display the latest update
+		return $message === '';
+	}
+
+	private function message( $type, array $message ) {
+		return Html::rawElement(
+			'div',
+			[
+				'id' => $message[0],
+				'class' => 'plainlinks ' . ( $type !== '' ? 'smw-callout smw-callout-'. $type : '' )
+			],
+			Message::get( $message, Message::PARSE, Message::USER_LANGUAGE )
+		);
+	}
+
+}