User:Samwilson/LinkIndexToWikidata.js

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Documentation for this user script can be added at User:Samwilson/LinkIndexToWikidata.

( function ( mw, $ ) {

	/** @var {string} The fully-qualified URL of the Index page. */
	const indexPageUrl = 'https://en.wikisource.org/wiki/' + mw.config.get( 'wgRelevantPageName' );

	/** @var {jQuery} The table cell to add info to. */
	const $tableCell = $( '<td>' );

	/**
	 * jQuery ajax result handler.
	 */
	function handleQueryResult( result ) {
		if ( !result.results || !result.results.bindings || !result.results.bindings[0] || !result.results.bindings[0].item.value ) {
			return;
			var $out = $( '<span>' )
				.addClass( 'error' )
				.text( "This Index appears to not yet be referenced from a Wikidata item. Please go to the edition's item on Wikidata and add the following value for 'Wikisource index page' (P1957): " )
				.append( $( '<code>' ).css( { fontSize: 'smaller', display: 'block' } ).text( indexPageUrl ) );
		} else {
			var itemUrl = result.results.bindings[0].item.value,
				itemId = itemUrl.substring( "http://www.wikidata.org/entity/".length );
			var $out = $( '<a>' )
				.attr( 'href', itemUrl )
				.attr( 'target', '_blank' )
				.text( itemId );
		}
		$tableCell.prepend( $out );
	}

	/**
	 * Set up HTML, and send request to Wikidata Query Service.
	 */
	function queryWikidata() {
		// First up, add a row to the metadata table, that we'll later add content to.
		var $tableHeader = $( '<th>' )
			.attr( 'class', 'ws-index-label' )
			.text( 'Wikidata' );
		$tableCell.attr( 'class', 'ws-index-value' );
		var $row = $( '<tr>' )
			.attr( 'class', 'ws-index-row' )
			.append( $tableHeader, $tableCell );
		$( '#ws-index-metadata tbody' ).prepend( $row );

		// Now query for the Wikidata item.
		const query = 'SELECT ?item WHERE { ?item wdt:P1957 <' + indexPageUrl + '> }'
			url = 'https://query.wikidata.org/sparql?format=json&query=' + encodeURIComponent( query );
		$.ajax( { url: url } ).done( handleQueryResult );
	}

	/**
	 * Entry point.
	 */
	function main() {
		if ( mw.config.get( 'wgCanonicalNamespace' ) === 'Index' ) {
			queryWikidata();
		}
	}

	main();
}( mediaWiki, jQuery ) );