User:1234qwer1234qwer4/BookCat.js

// based on https://en.wikipedia.org/wiki/User:DannyS712/Draft_no_cat.js
// Set `var bookCatAJAX = true;` to add BookCat without reloading the page
$(() => {
const bookCat = {};
window.bookCat = bookCat;
bookCat.config = {
 name: '[[User:1234qwer1234qwer4/BookCat.js|BookCat.js]]',
 debug: false
};

bookCat.summary = "Added {{[[Template:BookCat|BookCat]]}} using " + bookCat.config.name;
 
bookCat.run = function () {
 var editSummary = bookCat.summary;
 
 if ( bookCat.config.debug ) {
  console.log ( editSummary );
 }
 
 var api = new mw.Api();
 api.get( {
  action: 'query',
  titles: mw.config.get( 'wgPageName' ),
  prop: 'revisions',
  rvprop: 'content',
  rvslots: 'main',
  formatversion: 2
 } ).done(
  function ( response ) {
   console.log( response );
   var text = response.query.pages[0].revisions[0].slots.main.content;
   if(text.match(/\{\{\s*Bookcat\s*\}\}/i)){
    return mw.notify("BookCat already present.");
   }
   text += '\n\n{{BookCat}}';
   api.postWithEditToken( {
    action: 'edit',
    minor: true,
    title: mw.config.get( 'wgPageName' ),
    text: text,
    summary: editSummary
   } ).done(
    function() {
     if(bookCatAJAX === undefined || bookCatAJAX == false){
      location.reload();
     }
     else mw.notify("BookCat successfully added.");
    }
   );
  }
 );
};

});

$( document ).ready( () => {
 if ( mw.config.get( 'wgNamespaceNumber' ) === 0 && mw.config.get('wgAction') === 'view' && mw.config.get('wgCategories').every(e => !e.includes("Book:")) ) {
  mw.loader.using(
   [ 'mediawiki.util' ],
   function () {
    var  link = mw.util.addPortletLink( 'p-cactions', '#', 'BookCat', 'ca-bookcat', 'Add BookCat'); 
    $( link ).click( function ( event ) {
     event.preventDefault();
     mw.loader.using( 'mediawiki.api', window.bookCat.run );
    } );
   }
  );
 }
} );