Display count of lint errors on ?action=info

Change-Id: Ifcdfcb365e5ff6106b521d58a06df8c006772473

extension.json

@@ -28,6 +28,7 @@
 		"LoadExtensionSchemaUpdates": "MediaWiki\\Linter\\Hooks::onLoadExtensionSchemaUpdates",
 		"EditFormInitialText": "MediaWiki\\Linter\\Hooks::onEditFormInitialText",
 		"APIQuerySiteInfoGeneralInfo": "MediaWiki\\Linter\\Hooks::onAPIQuerySiteInfoGeneralInfo",
+		"InfoAction": "MediaWiki\\Linter\\Hooks::onInfoAction",
 		"WikiPageDeletionUpdates": "MediaWiki\\Linter\\Hooks::onWikiPageDeletionUpdates"
 	},
 	"APIModules": {

i18n/en.json

@@ -31,6 +31,7 @@
 	"linker-page-edit": "edit",
 	"linter-heading-errors": "Errors",
 	"linter-heading-warnings": "Warnings",
+	"pageinfo-linter": "Lint errors",
 	"apihelp-query+linterrors-description": "Get a list of lint errors",
 	"apihelp-query+linterrors-param-categories": "Categories of lint errors",
 	"apihelp-query+linterrors-param-limit": "Number of results to query",

i18n/qqq.json

@@ -33,6 +33,7 @@
 	"linker-page-edit": "Link text for edit link in {{msg-mw|linker-page-title-edit}} and {{msg-mw|linker-page-title-edit-template}}\n{{Identical|Edit}}",
 	"linter-heading-errors": "Heading on [[Special:LintErrors]]\n{{Identical|Error}}",
 	"linter-heading-warnings": "Heading on [[Special:LintErrors]]\n{{Identical|Warning}}",
+	"pageinfo-linter": "Heading on ?action=info for a page if it has lint errors",
 	"apihelp-query+linterrors-description": "{{doc-apihelp-description|query+linterrors}}",
 	"apihelp-query+linterrors-param-categories": "{{doc-apihelp-param|query+linterrors|categories}}",
 	"apihelp-query+linterrors-param-limit": "{{doc-apihelp-param|query+linterrors|limit}}",

includes/Database.php

@@ -199,11 +199,19 @@ class Database {
 	/**
 	 * @return int[]
 	 */
-	public function getTotals() {
+	public function getTotalsForPage() {
+		return $this->getTotals( [ 'linter_page' => $this->pageId ] );
+	}
+
+	/**
+	 * @param array $conds Query conditions
+	 * @return int[]
+	 */
+	public function getTotals( $conds = [] ) {
 		$rows = wfGetDB( DB_SLAVE )->select(
 			'linter',
 			[ 'linter_cat', 'COUNT(*) AS count' ],
-			[],
+			$conds,
 			__METHOD__,
 			[ 'GROUP BY' => 'linter_cat' ]
 		);

includes/Hooks.php

@@ -24,6 +24,7 @@ use ApiQuerySiteInfo;
 use Content;
 use DatabaseUpdater;
 use EditPage;
+use IContextSource;
 use MWCallableUpdate;
 use WikiPage;
 
@@ -101,4 +102,29 @@ class Hooks {
 			'warnings' => $catManager->getWarnings(),
 		];
 	}
+
+	/**
+	 * Hook: InfoAction
+	 *
+	 * Display quick summary of errors for this page on ?action=info
+	 *
+	 * @param IContextSource $context
+	 * @param array &$pageInfo
+	 */
+	public static function onInfoAction( IContextSource $context, array &$pageInfo ) {
+		$pageId = $context->getTitle()->getArticleID();
+		if ( !$pageId ) {
+			return;
+		}
+		$database = new Database( $pageId );
+		$totals = array_filter( $database->getTotalsForPage() );
+		if ( !$totals ) {
+			// No errors, yay!
+			return;
+		}
+
+		foreach ( $totals as $name => $count ) {
+			$pageInfo['linter'][] = [ $context->msg( "linter-category-$name" ), htmlspecialchars( $count ) ];
+		}
+	}
 }