User:Aram/diff restorer.js

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This user script seems to have a documentation page at User:Aram/diff restorer and an accompanying .css page at User:Aram/diff restorer.css.

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 /**
  * Description: Restore deleted lines easier while you are editing and viewing changes
  * Documentation: [[User:Aram/diff restorer]]
  * Version: 1.0.3
  */

 'use strict';

 mw.loader.load('//en.wikipedia.org/w/index.php?title=User:Aram/diff_restorer.css&action=raw&ctype=text/css','text/css');

 functiongetInsertPosition(element,content){
 constinitialLineRow=element.closest('tr')
 .prevAll('tr')
 .find('td.diff-lineno:first');

 if(!initialLineRow.length)returnnull;

 constlineText=initialLineRow.text();

 // Transform the text by replacing separators and converting digits
 letnormalizedText=lineText;

 constseparatorMap=mw.language.getSeparatorTransformTable();
 Object.entries(separatorMap).forEach(([latin,local])=>{
 normalizedText=normalizedText.replace(newRegExp(local,'g'),latin);
 });

 constdigitMap=mw.language.getDigitTransformTable();
 digitMap.forEach((latin,index)=>{
 normalizedText=normalizedText.replace(newRegExp(latin,'g'),index);
 });

 // Extract all numbers from the text
 constnumbers=normalizedText.match(/\d+/g);

 if(!numbers||numbers.length===0)returnnull;

 // Use the last number when moving from bottom to top
 constexactLineNumber=parseInt(numbers[numbers.length-1]);

 // Count non-deleted rows between current position and initial line
 constprevRows=element.closest('tr')
 .prevUntil(initialLineRow.closest('tr'))
 .not(':has(td.diff-empty.diff-side-deleted)');

 constlineNumber=exactLineNumber+prevRows.length;
 constlines=content.split('\n');

 // If line number exceeds content length, return end of content
 if(lineNumber>lines.length)returncontent.length;

 // Calculate insert position
 returnlines.slice(0,lineNumber-1).join('\n').length+(lineNumber>1?1:0);
 }

 (function(){
 functionaddRestoreButtons(){
 $('table.diff tbody tr:not(.diff-title) .diff-side-deleted:not(.diff-context)').each(function(){
 vardeletedLine=$(this);
 varaddedLine=deletedLine.closest('tr').find('.diff-side-added');
 varmovedPara=deletedLine.closest('tr').find('.mw-diff-movedpara-left');

 if(movedPara.length){
 vartargetAnchor=movedPara.attr('href').substring(1);
 addedLine=$('.diff-side-added').has('a[name="'+targetAnchor+'"]');
 }

 if(!addedLine.length)return;

 varrestoreBtn=$('<span>')
 .addClass('restore-btn')
 .attr('title','Restore this line')
 .click(function(){
 vareditBox=$('#wpTextbox1');
 if(!editBox.length||editBox.css('display')==='none'){
 mw.notify('Edit box not found. Please ensure you are in edit mode, or if you are, turn off code editor',{type:'error',autoHide:false});
 return;
 }

 vareditContent=editBox.val();
 vardeletedText=deletedLine.text();
 varsuccess=false;

 if(movedPara.length){
 varaddedText=addedLine.text();
 varcurrentPosition=editContent.indexOf(addedText);

 if(currentPosition!==-1){
 varcontentWithoutMoved=editContent.substring(0,currentPosition)+
 editContent.substring(currentPosition+addedText.length+
 (editContent[currentPosition+addedText.length]==='\n'?1:0));

 vartargetPosition=getInsertPosition(deletedLine,contentWithoutMoved);

 if(targetPosition!==null){
 editBox.val(contentWithoutMoved.substring(0,targetPosition)+
 deletedText+'\n'+
 contentWithoutMoved.substring(targetPosition));
 success=true;
 }
 }
 }elseif(addedLine.hasClass('diff-empty')||addedLine.find('br').length){
 varposition=getInsertPosition(deletedLine,editContent);
 if(position!==null){
 varnewContent=addedLine.hasClass('diff-empty')
 ?editContent.substring(0,position)+deletedText+'\n'+editContent.substring(position)
 :editContent.substring(0,position)+editContent.substring(position+1);
 editBox.val(newContent);
 success=true;
 }
 }elseif(editContent.includes(addedLine.text())){
 editBox.val(editContent.replace(addedLine.text(),deletedText));
 success=true;
 }

 restoreBtn
 .addClass(success?'restore-success':'restore-fail')
 .off('click');
 });

 deletedLine.append(restoreBtn);
 });
 }

 mw.hook('wikipage.diff').add(addRestoreButtons);
 })();

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