tln.min.js

let update_line_numbers=function(a,b){let c=a.value.split("\n").length,d=b.children.length,f=c-d;if(0<f){let g=document.createDocumentFragment();for(;0<f;){let h=document.createElement("span");h.className="tln-line",g.appendChild(h),f--}b.appendChild(g)}else if(0>f)for(;0>f;)b.removeChild(b.firstChild),f++},append_line_numbers=function(a){let w=console.warn,b=document.getElementById(a);if(null==b)return w("[tln.js] Couldn't find textarea of id '"+a+"'");if(-1!=b.className.indexOf("tln-active"))return w("[tln.js] textarea of id '"+a+"' is already numbered");b.classList.add("tln-active"),b.style={};let c=document.createElement("div");b.parentNode.insertBefore(c,b),c.className="tln-wrapper",update_line_numbers(b,c),b.onpropertychange=b.oninput=b.onkeydown=b.onkeyup=function(d,f){return function(g){(36==g.keyCode||36==g.which||"Home"==g.code||"Home"==g.key||13==g.keyCode||13==g.which||"Enter"==g.code||"NumpadEnter"==g.code||"Enter"==g.key)&&(d.scrollLeft=0),update_line_numbers(d,f)}}(b,c),b.onchange=b.onmousewheel=b.onscroll=function(d,f){return function(){f.scrollTop=d.scrollTop}}(b,c)};