wikimedia/mediawiki-extensions-MobileFrontend

const
    m = require( '../moduleLoaderSingleton' ),
    getDeviceLanguage = require( './getDeviceLanguage' ),
    Overlay = require( '../Overlay' ),
    MessageBox = require( '../MessageBox' ),
    currentPageHTMLParser = require( '../currentPageHTMLParser' )(),
    promisedView = require( '../promisedView' );

/**
 * @ignore
 * @return {jQuery.Promise} Resolves to LanguageSearcher
 */
function loadLanguageSearcher() {
    return mw.loader.using( 'mobile.languages.structured' ).then( () =>
        currentPageHTMLParser.getLanguages(
            mw.config.get( 'wgTitle' )
        ) ).then( ( data ) => {
        const LanguageSearcher = m.require( 'mobile.languages.structured/LanguageSearcher' );

        return new LanguageSearcher( {
            languages: data.languages,
            variants: data.variants,
            showSuggestedLanguages: true,
            deviceLanguage: getDeviceLanguage( navigator ),
            /**
             * Stable for use inside ContentTranslation.
             * @event ~'mobileFrontend.languageSearcher.onOpen'
             * @memberof Hooks
             * @param {Hooks~LanguageSearcher} searcher
             */
            onOpen: ( searcher ) => mw.hook( 'mobileFrontend.languageSearcher.onOpen' ).fire( searcher )
        } );
    }, () =>
        new MessageBox( {
            type: 'error',
            className: 'content',
            msg: mw.msg( 'mobile-frontend-languages-structured-overlay-error' )
        } ) );
}

/**
 * Factory function that returns a language featured instance of an Overlay.
 *
 * @function
 * @memberof module:mobile.startup/languages
 * @return {module:mobile.startup/Overlay}
 */
function languageOverlay() {
    return Overlay.make(
        {
            heading: mw.msg( 'mobile-frontend-language-heading' ),
            className: 'overlay language-overlay'
        }, promisedView( loadLanguageSearcher() )
    );
}

// To make knowing when async logic has resolved easier in tests
languageOverlay.test = {
    loadLanguageSearcher
};

module.exports = languageOverlay;