GitHub: generate TOC table of contents for README.md

GitHub-TOC.js

// Execute me in Console on the repository page
Array.prototype.map.call(document.querySelectorAll('a[class=anchor]'), el => {
    var href = el.href, 
        title = el.parentElement.textContent.replace(/^\s+|\s+$/g, ''), 
        level = parseInt(el.parentElement.tagName.substr(1)), 
        indent = (new Array(level)).join('    '); 
    
   return indent + '* <a href="'+href.replace(/^user-content-/, '')+'">'+title+'</a>';
}).join("\n    ");
 
// Detect links with missing targets
$('#readme a[href^="#"]').filter('[class!=anchor]').map(function(){
    var $this = $(this),
        href=$this.attr('href'),
        name=href.substr(1),
        $targets = $('a[id="user-content-'+name+'"]'); 
 
    if (!$targets.length) 
        console.log('Wrong link target: ', $this.get(0));  }
);