SugarCube v2 basic internationalization (i18n) example using the Settings menu (in Twee notation)

## sc-i18n-example.twee
:: StoryTitle
SugarCube i18n example


:: Language Switching [script]
;(function () {
	/***********************************************************
		Set up a `i18n` object on SugarCube's `setup` object.
	***********************************************************/
	setup.i18n = {
		/*
			Map of language labels to codes for all supported
			languages go here.
		*/
		langs : {

			// NOTE: User customization required here.

			'Deutsche' : 'de',
			'English'  : 'en',
			'Français' : 'fr',

		},

		/*
			Utility code.  You probably do not need to worry
			about any of these.
		*/
		codes : function () {
			return Object.keys(this.langs).map(function (label) {
				return this.langs[label];
			}, this);
		},

		labels : function () {
			return Object.keys(this.langs);
		},

		labelFromCode : function (code) {
			var label = Object.keys(this.langs).find(function (label) {
				return this.langs[label] === code;
			}, this);

			if (!label) {
				throw new Error('unknown language code "' + code + '"');
			}

			return label;
		}
	};


	/***********************************************************
		Language switching setting.
	***********************************************************/
	function initLanguage() {
		/*
			Set the `l10nStrings` properties to the appropriate
			values for each supported language.

			English need not receive a case, unless you simply
			want to alter the default values, as it is the
			default language.
		*/
		switch (setup.i18n.langs[settings.lang]) {

		/*
			NOTE 1: User customization required here.

			NOTE 2: The `l10nStrings` properties shown in the cases below are an
			abbreviated set for example purposes.  There are many more properties
			within the `l10nStrings` object which you'll need to handle.
		*/

		case 'de':
			l10nStrings.settingsTitle = 'Einstellungen';
			l10nStrings.settingsOff   = 'Deaktivieren';
			l10nStrings.settingsOn    = 'Aktivieren';
			l10nStrings.settingsReset = 'Auf Standardeinstellung zurücksetzen';
			break;

		case 'fr':
			l10nStrings.settingsTitle = 'Paramètres';
			l10nStrings.settingsOff   = 'Désactiver';
			l10nStrings.settingsOn    = 'Activer';
			l10nStrings.settingsReset = 'Réinitialiser les paramètres par défaut';
			break;

		}

		/*
			Set the `lang` attribute on the document element to
			the appropriate value.  This is mostly notational,
			though it could also be used to enable localization
			specific styling.
		*/
		$('html').attr('lang', setup.i18n.langs[settings.lang]);
	}

	function changeLanguage() {
		/*
			Reload the application to ensure that the proper
			localizations are loaded.
		*/
		window.location.reload();
	}

	Setting.addList('lang', {
		label    : 'Language.',
		list     : setup.i18n.labels(),
		default  : setup.i18n.labelFromCode('en'),
		onInit   : initLanguage,
		onChange : changeLanguage
	});


	/***********************************************************
		Set up a `postrender` task which renders the appropriate
		language code suffixed passage into each non-suffixed
		passage.
	***********************************************************/
	postrender['i18n-passage-include'] = function (content) {
		var passage = State.passage + '_' + setup.i18n.langs[settings.lang];
		$(content).empty().wiki(Story.get(passage).processText());
	};
})();


:: Start
/*

The non-suffixed passages are here to prevent Twine from
complaining endlessly about missing passages, SugarCube from
showing broken links, and to keep the story history free of
suffixed passage names so that changing languages on the fly
will work.

The actual passages are the language code suffixed versions.
For example, for this starting passage the German version
would be Start_de, the French Start_fr, and English Start_en.

When creating links between passages, you must always link to
the non-suffixed versions and never to the suffixed versions.
The postrender task will handle displaying the correct version
based on the currently selected language.

NOTE: While nothing within the non-suffixed passages will be
displayed, they will be rendered.  Meaning side-effects from
included code will be in effect—e.g. modifications to story
variables.  Thus, you should either leave them empty or place
all contents within comment blocks—like this one.

*/


:: Start_de
Deutsche.

[[Nächster|Next]]


:: Start_en
English.

[[Next]]


:: Start_fr
Français.

[[Prochain|Next]]


:: Next
/* This should be empty. */


:: Next_de
Nächster


:: Next_en
Next


:: Next_fr
Prochain