PrismJS line numbers tweak for Ghost

line-numbers.js

Prism.hooks.add("after-highlight", function(e) {
    var el = e.element,
        t = el.parentNode; 
        
    // Add 'line-numbers' class to the parent 
    if (el.className.indexOf('line-numbers') !== -1) { 
        t.className = t.className + ' line-numbers'; 
    } 
    
    // The rest of the plugin
    if(!t||!/pre/i.test(t.nodeName)||t.className.indexOf("line-numbers")===-1){return}var n=1+e.code.split("\n").length;var r;lines=new Array(n);lines=lines.join("<span></span>");r=document.createElement("span");r.className="line-numbers-rows";r.innerHTML=lines;if(t.hasAttribute("data-start")){t.style.counterReset="linenumber "+(parseInt(t.getAttribute("data-start"),10)-1)}e.element.appendChild(r)
});