User:Fish bowl/zhRedirect.js

mw.loader.load(['mediawiki.cookie', 'mediawiki.util']);

// IDEA: also only do stuff if the URL contains #Chinese....

let doStuff = ($('body').hasClass('action-view') && mw.config.get('wgCanonicalNamespace') === '');
let isEnabled = true;
let settings = JSON.parse(localStorage.getItem('zhRedirectSettings'));

function boolAsOnOff(bool) {
	return (bool ? 'on' : 'off')
}

function initializeEnabledCookie() {
	if (mw.cookie.get('zhRedirectEnabled') === null) {
		mw.cookie.set('zhRedirectEnabled', true);
	}
}

function retrieveEnabledCookie() {
	isEnabled = (mw.cookie.get('zhRedirectEnabled') === 'true'); // https://stackoverflow.com/a/264037
}

function toggleEnabledCookie() {
	isEnabled = ! isEnabled;
	mw.cookie.set('zhRedirectEnabled', isEnabled);
	$('#zh-redirect-status').text(boolAsOnOff(isEnabled));
}

function addPortletLink() {
	let portletLink = mw.util.addPortletLink(
		'p-tb',
		'#',
		'zhRedirect is ',
		't-zhredirect',
		'Enable or disable automatic redirection from Chinese simplified or variant form entries to the main entry'
	);

	$(portletLink).click(function(event) {
		event.preventDefault();
		toggleEnabledCookie();
	});

	$('<span>').attr('id', 'zh-redirect-status').text(boolAsOnOff(isEnabled)).appendTo(portletLink);
}

function followRedirect() {
	let originalEntry = mw.config.get('wgPageName');
	
	let zhSee = $('[style*="eeeeee"]'); // temp
	let zhPron = $('[style*="width:500px"]'); // temp
	
	let redirectMe = zhSee.length === 1 && zhPron.length === 0;

	if (redirectMe && settings.secondaryDesiredLanguages) {
		$.each(settings.secondaryDesiredLanguages, function(languageName, keepThisLanguage) {
			if ($('.mw-headline#' + languageName).length) {
				redirectMe = false;
				mw.notify('There is a ' + languageName + ' entry on this page so you have not been redirected.');
				return;
			}
		});
	}
	
	let tradEntryLink = zhSee.find('b a')[0]; // temp

	if (redirectMe) {
		redirectMe = ! (tradEntryLink.classList.contains('new')); // red link in zh-see
	}

	if (redirectMe) {
		window.location = mw.util.getUrl(tradEntryLink.title, { zhRedirect: originalEntry });
	}
}

function redirectNotice() {
	let originalEntryRecovered = mw.util.getParamValue('zhRedirect');

	if (originalEntryRecovered !== null) {
		originalEntryRecovered = decodeURIComponent(originalEntryRecovered);

		mw.notify('Redirected from ' + originalEntryRecovered + '.');
	}
}

if (doStuff) {
	initializeEnabledCookie();
	retrieveEnabledCookie();

	if (isEnabled) {
		followRedirect();
	}

	redirectNotice();
	addPortletLink();
}