feat: allow tab content to be transclusions of other pages

* Initial merge of the TabberTransclude extension from Ciencia
* Tab content can now be fetched from other pages on the wiki. The content is lazy-loaded when the tab is selected through a XHR request.
* Add a config option to disable setting URL hash on tab change

extension.json

@@ -1,6 +1,6 @@
 {
 	"name": "TabberNeue",
-	"version": "1.2.0",
+	"version": "1.3.0",
 	"author": [
 		"alistair3149",
 		"Eric Fortin",
@@ -25,7 +25,17 @@
 	"ResourceModules": {
 		"ext.tabberNeue": {
 			"packageFiles": [
-				"ext.tabberNeue.js"
+				"ext.tabberNeue.js",
+				{
+					"name": "config.json",
+					"config": {
+						"updateLocationOnTabChange": "TabberNeueUpdateLocationOnTabChange"
+					}
+				}
+			],
+			"messages": [
+				"tabberneue-loading",
+				"tabberneue-error"
 			],
 			"styles": [
 				"ext.tabberNeue.less"
@@ -62,6 +72,14 @@
 		"localBasePath": "modules",
 		"remoteExtPath": "TabberNeue/modules"
 	},
+	"config_prefix": "wg",
+	"config": {
+		"TabberNeueUpdateLocationOnTabChange": {
+			"value": true,
+			"description": "If enabled, when a tab is selected, the URL displayed on the browser changes. Opening this URL makes that tab initially selected.",
+			"public": true
+		}
+	},
 	"Hooks": {
 		"ParserFirstCallInit": [
 			"TabberNeue\\TabberNeueHooks::onParserFirstCallInit"

i18n/en.json

@@ -2,8 +2,11 @@
     "@metadata": {
         "authors": [
             "alistair3149",
-            "Eric Fortin"
+            "Eric Fortin",
+            "Ciencia Al Poder"
         ]
     },
-    "tabberneue-desc": "Allows to create tabs within a page. Forked from [https://www.mediawiki.org/wiki/Extension:Tabber Extension:Tabber]."
+    "tabberneue-desc": "Allows to create tabs within a page. Forked from [https://www.mediawiki.org/wiki/Extension:Tabber Extension:Tabber].",
+    "tabberneue-loading": "Loading...",
+    "tabberneue-error": "Error."
 }

i18n/es.json

@@ -1,8 +1,10 @@
 {
 	"@metadata": {
 		"authors": [
-			"Armando-Martin"
+			"Ciencia Al Poder"
 		]
 	},
-	"tabberneue-desc": "Permite para fichas dentro de una página"
+	"tabberneue-desc": "Permite usar pestañas dentro de una página.",
+	"tabberneue-loading": "Cargando...",
+	"tabberneue-error": "Error."
 }

i18n/qqq.json

@@ -4,5 +4,7 @@
 			"Shirayuki"
 		]
 	},
-	"tabberneue-desc": "{{desc|name=TabberNeue|url=http://www.mediawiki.org/wiki/Extension:TabberNeue}}"
+	"tabberneue-desc": "{{desc|name=TabberNeue|url=http://www.mediawiki.org/wiki/Extension:TabberNeue}}",
+	"tabberneue-loading": "Placeholder loading message for the tab content",
+    "tabberneue-error": "Error message shown loading tab content"
 }

includes/TabberNeueHooks.php

@@ -4,7 +4,7 @@
  * TabberNeue Hooks Class
  *
  * @package TabberNeue
- * @author  alistair3149, Eric Fortin, Alexia E. Smith
+ * @author  alistair3149, Eric Fortin, Alexia E. Smith, Ciencia Al Poder
  * @license GPL-3.0-or-later
  * @link    https://www.mediawiki.org/wiki/Extension:TabberNeue
  */
@@ -13,8 +13,11 @@ declare( strict_types=1 );
 
 namespace TabberNeue;
 
+use Hooks;
+use MediaWiki\MediaWikiServices;
 use Parser;
 use PPFrame;
+use Title;
 
 class TabberNeueHooks {
 	/**
@@ -24,6 +27,7 @@ class TabberNeueHooks {
 	 */
 	public static function onParserFirstCallInit( Parser $parser ) {
 		$parser->setHook( 'tabber', [ __CLASS__, 'renderTabber' ] );
+		$parser->setHook( 'tabbertransclude', [ __CLASS__, 'renderTabberTransclude' ] );
 	}
 
 	/**
@@ -77,4 +81,110 @@ class TabberNeueHooks {
 
 		return $tab;
 	}
+
+	/**
+	 * Renders the necessary HTML for a <tabbertransclude> tag.
+	 *
+	 * @param string $input The input URL between the beginning and ending tags.
+	 * @param array $args Array of attribute arguments on that beginning tag.
+	 * @param Parser $parser Mediawiki Parser Object
+	 * @param PPFrame $frame Mediawiki PPFrame Object
+	 *
+	 * @return string HTML
+	 */
+	public static function renderTabberTransclude( $input, array $args, Parser $parser, PPFrame $frame ) {
+		$parser->getOutput()->addModules( [ 'ext.tabberNeue' ] );
+		$selected = true;
+
+		$arr = explode( "\n", $input );
+		$htmlTabs = '';
+		foreach ( $arr as $tab ) {
+			$htmlTabs .= self::buildTabTransclude( $tab, $parser, $frame, $selected );
+		}
+
+		$html = '<div class="tabber">' .
+			'<section class="tabber__section">' . $htmlTabs . "</section></div>";
+
+		return $html;
+	}
+
+	/**
+	 * Build individual tab.
+	 *
+	 * @param string $tab Tab information
+	 * @param Parser $parser Mediawiki Parser Object
+	 * @param PPFrame $frame Mediawiki PPFrame Object
+	 * @param bool $selected The tab is the selected one
+	 *
+	 * @return string HTML
+	 */
+	private static function buildTabTransclude( $tab, Parser $parser, PPFrame $frame, &$selected ) {
+		$tab = trim( $tab );
+		if ( empty( $tab ) ) {
+			return '';
+		}
+
+		$tabBody = '';
+		$dataProps = [];
+		// Use array_pad to make sure at least 2 array values are always returned
+		list( $pageName, $tabName ) = array_pad( explode( '|', $tab, 2 ), 2, '' );
+		$title = Title::newFromText( trim( $pageName ) );
+		if ( !$title ) {
+			if ( empty( $tabName ) ) {
+				$tabName = $pageName;
+			}
+			$tabBody = sprintf( '<div class="error">Invalid title: %s</div>', $pageName );
+			$pageName = '';
+		} else {
+			$pageName = $title->getPrefixedText();
+			if ( empty( $tabName ) ) {
+				$tabName = $pageName;
+			}
+			$dataProps['page-title'] = $pageName;
+			if ( $selected ) {
+				$tabBody = $parser->recursiveTagParseFully(
+					sprintf( '{{:%s}}', $pageName ),
+					$frame
+				);
+			} else {
+				// Add a link placeholder, as a fallback if JavaScript doesn't execute
+				$linkRenderer = MediaWikiServices::getInstance()->getLinkRenderer();
+				$tabBody = sprintf(
+					'<div class="tabber__ajaxplaceholder">%s</div>',
+					$linkRenderer->makeLink( $title, null, [ 'rel' => 'nofollow' ] )
+				);
+				$dataProps['pending-load'] = '1';
+				// 1.37: $currentTitle = $parser->getPage();
+				$currentTitle = $parser->getTitle();
+				$query = sprintf(
+					'?action=parse&format=json&formatversion=2&title=%s&text={{:%s}}&redirects=1&prop=text&disablelimitreport=1&disabletoc=1&wrapoutputclass=',
+					urlencode( $currentTitle->getPrefixedText() ),
+					urlencode( $pageName )
+				);
+				$dataProps['load-url'] = wfExpandUrl( wfScript( 'api' ) . $query,  PROTO_CANONICAL );
+				$oldTabBody = $tabBody;
+				// Allow extensions to update the lazy loaded tab
+				Hooks::run( 'TabberTranscludeRenderLazyLoadedTab', [ &$tabBody, &$dataProps, $parser, $frame ] );
+				if ( $oldTabBody != $tabBody ) {
+					$parser->getOutput()->recordOption( 'tabbertranscludelazyupdated' );
+				}
+			}
+			// Register as a template
+			$revRecord = $parser->fetchCurrentRevisionRecordOfTitle( $title );
+			$parser->getOutput()->addTemplate(
+				$title,
+				$title->getArticleId(),
+				$revRecord ? $revRecord->getId() : null
+			);
+		}
+
+		$tab = '<article class="tabber__panel" title="' . htmlspecialchars( $tabName ) . '"';
+		$tab .= implode( array_map( static function ( $prop, $value ) {
+			return sprintf( ' data-tabber-%s="%s"', $prop, htmlspecialchars( $value ) );
+		}, array_keys( $dataProps ), $dataProps ) );
+		$tab .= '>' . $tabBody . '</article>';
+		$selected = false;
+
+		return $tab;
+	}
 }

modules/ext.tabberNeue.js

@@ -7,7 +7,8 @@
 function initTabber( tabber, count ) {
 	var tabPanels = tabber.querySelectorAll( ':scope > .tabber__section > .tabber__panel' );
 
-	var container = document.createElement( 'header' ),
+	var config = require( './config.json' ),
+		container = document.createElement( 'header' ),
 		tabList = document.createElement( 'nav' ),
 		prevButton = document.createElement( 'div' ),
 		nextButton = document.createElement( 'div' );
@@ -149,22 +150,62 @@ function initTabber( tabber, count ) {
 			updateButtons();
 		} );
 
-		// Listen for window resize
-		window.addEventListener( 'resize', mw.util.debounce( 250, setupButtons ) );
+		// Listen for element resize
+		if ( window.ResizeObserver ) {
+			var tabListResizeObserver = new ResizeObserver( mw.util.debounce( 250, setupButtons ) );
+			tabListResizeObserver.observe( tabList );
+		}
 	};
 
+	// NOTE: Are there better ways to scope them?
+	var xhr = new XMLHttpRequest();
+	var currentRequest = null, nextRequest = null;
+
+	/**
+	 * Loads page contents into tab
+	 *
+	 * @param {HTMLElement} tab panel
+	 * @param {string} api URL
+	 */
+	function loadPage( targetPanel, url ) {
+		var requestData = {
+			url: url,
+			targetPanel: targetPanel
+		};
+		if ( currentRequest ) {
+			if ( currentRequest.url != requestData.url ) {
+				nextRequest = requestData;
+			}
+			// busy
+			return;
+		}
+		xhr.open( 'GET', url );
+		currentRequest = requestData;
+		xhr.send( null );
+	}
+
 	/**
 	 * Show panel based on target hash
 	 *
 	 * @param {string} targetHash
 	 */
-	function showPanel( targetHash ) {
+	function showPanel( targetHash, allowRemoteLoad ) {
 		var ACTIVETABCLASS = 'tabber__tab--active',
 			ACTIVEPANELCLASS = 'tabber__panel--active',
 			targetPanel = document.getElementById( targetHash ),
 			targetTab = document.getElementById( 'tab-' + targetHash ),
 			section = targetPanel.parentElement,
-			activePanel = section.querySelector( ':scope > .' + ACTIVEPANELCLASS );
+			activePanel = section.querySelector( ':scope > .' + ACTIVEPANELCLASS ),
+			parentPanel, parentSection;
+
+		if ( allowRemoteLoad && targetPanel.dataset.tabberPendingLoad && targetPanel.dataset.tabberLoadUrl ) {
+			var loading = document.createElement( 'div' );
+			loading.setAttribute( 'class', 'tabber__loading' );
+			loading.appendChild( document.createTextNode( mw.message( 'tabberneue-loading' ).text() ) );
+			targetPanel.textContent = '';
+			targetPanel.appendChild( loading );
+			loadPage( targetPanel, targetPanel.dataset.tabberLoadUrl );
+		}
 
 		/* eslint-disable mediawiki/class-doc */
 		if ( activePanel ) {
@@ -212,6 +253,48 @@ function initTabber( tabber, count ) {
 		/* eslint-enable mediawiki/class-doc */
 	}
 
+	/**
+	 * Event handler for XMLHttpRequest where ends loading
+	 */
+	function onLoadEndPage() {
+		var targetPanel = currentRequest.targetPanel;
+		if ( xhr.status != 200 ) {
+			var err = document.createElement( 'div' );
+			err.setAttribute( 'class', 'tabber__error' );
+			err.appendChild( document.createTextNode( mw.message( 'tabberneue-error' ).text() ) );
+			targetPanel.textContent = '';
+			targetPanel.appendChild( err );
+		} else {
+			var result = JSON.parse( xhr.responseText );
+			targetPanel.innerHTML = result.parse.text;
+			// wikipage.content hook requires a jQuery object
+			mw.hook( 'wikipage.content' ).fire( $( targetPanel ) );
+			delete targetPanel.dataset.tabberPendingLoad;
+			delete targetPanel.dataset.tabberLoadUrl;
+		}
+
+		var ACTIVEPANELCLASS = 'tabber__panel--active',
+			targetHash = targetPanel.getAttribute( 'id' ),
+			section = targetPanel.parentElement,
+			activePanel = section.querySelector( ':scope > .' + ACTIVEPANELCLASS );
+
+		if ( nextRequest ) {
+			currentRequest = nextRequest;
+			nextRequest = null;
+			xhr.open( 'GET', currentRequest.url );
+			xhr.send( null );
+		} else {
+			currentRequest = null;
+		}
+		if ( activePanel ) {
+			// Refresh height
+			showPanel( targetHash, false );
+		}
+	}
+
+	xhr.timeout = 20000;
+	xhr.addEventListener( 'loadend', onLoadEndPage );
+
 	/**
 	 * Retrieve target hash and trigger show panel
 	 * If no targetHash is invalid, use the first panel
@@ -244,9 +327,11 @@ function initTabber( tabber, count ) {
 		tab.addEventListener( 'click', function( event ) {
 			var targetHash = tab.getAttribute( 'href' ).substring( 1 );
 			event.preventDefault();
+			if ( !config || config.updateLocationOnTabChange ) {
 				// Add hash to the end of the URL
 				history.replaceState( null, null, '#' + targetHash );
-			showPanel( targetHash );
+			}
+			showPanel( targetHash, true );
 		} );
 	} );