// <syntaxhighlight lang="javascript">
// Pageswap GUI by [[User:Ahecht]] 
// Performs [[WP:PMRC#4]] round-robin history swaps
// Based on [[:en:User:Andy M. Wang/pageswap.js]] by [[User:Andy M. Wang]] 1.6.1.2018.0920

var pageSwapVersion = "v2.3.7";

if (window.location.href.search("Special:MovePage") > -1 && window.location.href.search("pageswap=true") > -1) {
	document.getElementById("mw-movepage-table").style.display="none";
	document.getElementById("mw-movepage-table").before(
		$('<div/>', {id: "movepage-loading", text: "Loading..."})
	);
}

$(document).ready(function() {
mw.loader.using( [ 'mediawiki.api',	'mediawiki.util' ], function() {
"use strict";

/**
 * Initialize variables
 */
var psDebug = (mw.util.getParamValue("psdebug") || false),
	psScriptPrefix = ":en:User:Ahecht/Scripts/pageswap",
	psPortletName = "Swap",
	psPortletTitle = "Perform a revision history swap / round-robin move",
	psOrigErrorText = "a page of that name already exists",
	psErrorText = 'Please choose another name, or perform a <a title="'+psPortletTitle+
		'" href="#" id="pageswapLink">'+psPortletName+'</a>.',
	psOrigWarningText = '" already exists',
	psWarningText = ' You can also perform a <a title="'+psPortletTitle+
		'" href="#" id="pageswapLink">'+psPortletName+'</a>.',
	psCore = psScriptPrefix + "-core.js",
	currNs = mw.config.get("wgNamespaceNumber");

if (currNs >= -1 && currNs < 120 &&
	(currNs <  6 || currNs > 9) &&
	(currNs < 14 || currNs > 99) &&
	((currNs != -1 && mw.config.get("wgArticleId") != 0) || mw.config.get("wgCanonicalSpecialPageName") == "Movepage")
) {
	var portletLink = mw.util.addPortletLink("p-cactions", "#", psPortletName + (psDebug ? " (debug)" : ""),
		"ca-swappages", psPortletTitle);
	$( portletLink ).click(function(e) {
		e.preventDefault();
		
		var psMoveReason = mw.util.getParamValue("wpReason") || '';
		if (document.getElementsByName("wpReason")[0] && document.getElementsByName("wpReason")[0].value != '') {
			psMoveReason = document.getElementsByName("wpReason")[0].value;
		} else if (psMoveReason == '' && typeof moveReasonDefault === 'string') {
			psMoveReason = moveReasonDefault;
		}
		
		if (currNs == -1 && mw.config.get("wgCanonicalSpecialPageName") == "Movepage") {
			var psCoreURL = mw.config.get("wgServer")+mw.config.get("wgScript")+
				"?title="+psCore+"&action=raw&ctype=text/javascript";
			console.log("Loading " + psCore + " " + pageSwapVersion);
			mw.loader.using( [ 'oojs-ui', 'mediawiki.widgets', 'mediawiki.ui.button' ], function () {
				mw.loader.getScript( psCoreURL ).then( function () {
					return pageSwap(psScriptPrefix, psMoveReason, psDebug);
				} );
			} );
		} else {
			var urlParams = {
				title: mw.config.get("wgFormattedNamespaces")[-1]+":MovePage",
				wpOldTitle: mw.config.get("wgPageName"),
				wpReason: psMoveReason,
				pageswap: true
			};
			if (psDebug) {urlParams.psdebug = "true";}
			urlParams = new URLSearchParams(urlParams).toString();
			
			window.location.href=mw.config.get("wgServer")+mw.config.get("wgScript")+"?"+urlParams;
		}
	});
	
	if (mw.config.get("wgCanonicalSpecialPageName") == "Movepage" && 
		(mw.util.getParamValue("wpOldTitle") || 
			(document.getElementsByName("wpOldTitle")[0] &&
			document.getElementsByName("wpOldTitle")[0].value != '')
		)
	) {
		if ( $( "div.cdx-message--error" ).find( "p" ).eq(1).is( ":contains('"+psOrigErrorText+"')" ) ) {
			$( "div.cdx-message--error" ).find( "p" ).eq(2).html( psErrorText );
		} else if (	$( "div.cdx-message--warning" ).find( "td.mbox-text" ).eq(0).is( ":contains('"+psOrigWarningText+"')" ) ) {
			$( "div.cdx-message--warning" ).find( "td.mbox-text" ).eq(0).append( psWarningText );
		}
		$( "#pageswapLink" ).click(function(e) {
			e.preventDefault();
			$( portletLink ).click();
		});
		if (mw.util.getParamValue("pageswap")){
			$( portletLink ).click();
		}
	}
}

});
});

// </syntaxhighlight>