User:Fred Gandt/previewCategoryDupeArgs.js

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This code will be executed when previewing this page.

Documentation for this user script can be added at User:Fred Gandt/previewCategoryDupeArgs.

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/* EXPERIMENTAL IN DEVELOPMENT - USE WITH CAUTION! */

( function( DOM_w, DOM_d ) {
	var ctgry = "Category:Pages_using_duplicate_arguments_in_template_calls",
		smmry = "Removed first instances of [[" + ctgry + "|duplicate template parameters" +
			"]] using [[User:Fred Gandt/previewCategoryDupeArgs.js|previewCategoryDupeArgs.js]] (alpha in development)",
		eById = function( id ) { return DOM_d.getElementById( id ); };
	$( DOM_d ).ready( function() {
		var WP_summary = eById( "wpSummary" );
		if ( mw.config.get( "wgPageName" ) === ctgry ) {
			var trgts = [].slice.call( DOM_d.getElementById( "mw-pages" ).getElementsByClassName( "mw-content-ltr" )[ 0 ].getElementsByTagName( "a" ) ), trgt, ctrgt,
				smmrycmpnnt = encodeURIComponent( smmry ),
				urls = location.origin + "/w/index.php?title=", urle = "&action=edit&preview=yes&summary=" + smmrycmpnnt;
			for ( trgt in trgts ) {
				ctrgt = trgts[ trgt ];
				ctrgt.href = urls + mw.util.wikiUrlencode( ctrgt.textContent ) + urle;
				ctrgt.setAttribute( "target", "_blank" );
			}
		} else if ( WP_summary && WP_summary.value === smmry ) {
			var prvwnt = DOM_d.getElementsByClassName( "previewnote" )[ 0 ],
				wrnngs = prvwnt.getElementsByTagName( "p" );
			if ( wrnngs[ 1 ] ) {
				var txtbx = eById( "wpTextbox1" ),
					raw = txtbx.value, wrnng, cwrnng, mtch,
					tmplt, dplct, pttrn, ndx, subbfr, subftr, offndr;
				prvwnt.removeChild( wrnngs[ 0 ] );
				prvwnt.removeChild( prvwnt.getElementsByTagName( "hr" )[ 0 ] );
				prvwnt.removeChild( eById( "mw-previewheader" ) );
				eById( "wikiEditor-ui-toolbar" ).appendChild( prvwnt );
				eById( "wpMinoredit" ).checked = true;
				eById( "editform" ).scrollIntoView();
				for ( wrnng in wrnngs ) {
					if ( wrnngs.hasOwnProperty( wrnng ) ) {
						cwrnng = wrnngs[ wrnng ];
						cwrnng.style = "text-indent:1em;";
						tmplt = ( /Template:([^]+)$/gi ).exec( cwrnng.getElementsByTagName( "a" )[ 0 ].title )[ 1 ].toLowerCase();
						dplct = ( /"([^"]+)/gi ).exec( cwrnng.textContent )[ 1 ].toLowerCase();
						pttrn = new RegExp( "(\\{\\{\\s*" + tmplt + "[^\\}]+?(\\|\\s*" + dplct + "\\s*\\=[^\\|\\}]+?)\\|[^\\}]*?\\|[^\\w\\d]*?" + dplct + "\\s*\\=[^]+?\\}\\})", "gi" );
						while ( !!( mtch = pttrn.exec( raw ) ) ) {
							nst = mtch[ 1 ];
							offndr = mtch[ 2 ];
							ndx = mtch.index + nst.indexOf( offndr );
							if ( confirm( offndr + "\n\n" + nst + "\n\n" ) ) {
								subbfr = raw.substr( 0, ndx );
								subftr = raw.substr( ndx + offndr.length );
								txtbx.value = subbfr + subftr;
							}
						}
					}
				}
			}
		}
	} );
} ( window, document ) );