tln.min.js

const TLN={eventList:{},update_line_numbers:function(e,t){let n=e.value.split("\n").length-t.children.length;if(n>0){const e=document.createDocumentFragment();for(;n>0;){const t=document.createElement("span");t.className="tln-line",e.appendChild(t),n--}t.appendChild(e)}for(;n<0;)t.removeChild(t.lastChild),n++},append_line_numbers:function(e){const t=document.getElementById(e);if(null==t)return console.warn("[tln.js] Couldn't find textarea of id '"+e+"'");if(-1!=t.className.indexOf("tln-active"))return console.warn("[tln.js] textarea of id '"+e+"' is already numbered");t.classList.add("tln-active"),t.style={};const n=document.createElement("div");n.className="tln-wrapper",t.parentNode.insertBefore(n,t),TLN.update_line_numbers(t,n),TLN.eventList[e]=[];const l=["propertychange","input","keydown","keyup"],o=function(e,t){return function(n){(10!=+e.scrollLeft||37!=n.keyCode&&37!=n.which&&"ArrowLeft"!=n.code&&"ArrowLeft"!=n.key)&&36!=n.keyCode&&36!=n.which&&"Home"!=n.code&&"Home"!=n.key&&13!=n.keyCode&&13!=n.which&&"Enter"!=n.code&&"Enter"!=n.key&&"NumpadEnter"!=n.code||(e.scrollLeft=0),TLN.update_line_numbers(e,t)}}(t,n);for(let n=l.length-1;n>=0;n--)t.addEventListener(l[n],o),TLN.eventList[e].push({evt:l[n],hdlr:o});const r=["change","mousewheel","scroll"],s=function(e,t){return function(){t.scrollTop=e.scrollTop}}(t,n);for(let n=r.length-1;n>=0;n--)t.addEventListener(r[n],s),TLN.eventList[e].push({evt:r[n],hdlr:s})},remove_line_numbers:function(e){const t=document.getElementById(e);if(null==t)return console.warn("[tln.js] Couldn't find textarea of id '"+e+"'");if(-1==t.className.indexOf("tln-active"))return console.warn("[tln.js] textarea of id '"+e+"' isn't numbered");t.classList.remove("tln-active");const n=t.previousSibling;if("tln-wrapper"==n.className&&n.remove(),TLN.eventList[e]){for(let n=TLN.eventList[e].length-1;n>=0;n--){const l=TLN.eventList[e][n];t.removeEventListener(l.evt,l.hdlr)}delete TLN.eventList[e]}}};