// ==UserScript==
// @name        AutoLinker
// @namespace   tea.pm
// @include     *
// @grant       none
// @version     1.0
// @author      cljnnn
// @description 自动将页面所有文本转换为链接
// @description_en trun url in text to link
// @downloadURL none
// ==/UserScript==
String.prototype.isEmpty = function() {
    return (this.length === 0 || !this.trim());
};

const reUrl = /\b(https?:\/\/\S*)\b/g;

function fixURL(node) {
  value = node.nodeValue;
  // console.log("updating link... ", value);
  newValue = value.replace(reUrl, '<a target="_blank" href="$1">$1</a>');
  var replacementNode = document.createElement('span');
  replacementNode.innerHTML = newValue;
  node.parentNode.insertBefore(replacementNode, node);
  node.parentNode.removeChild(node);
}

function traverse(node) {
  if(!node) {
    return;
  }
  if(node.nodeType != Node.ELEMENT_NODE && node.nodeType != Node.TEXT_NODE) {
    return;
  }
  let name = node.nodeName;
  if(name == "SCRIPT" || name == "STYLE" || name == "A") {
    return;
  }
  if(node.nodeType == Node.TEXT_NODE) {
    let value = node.nodeValue;
    if(!value.isEmpty()) {
      if(value.match(reUrl)) {
        fixURL(node);
      }
    }
  }
  for(let child of node.childNodes) {
    traverse(child);
  }
}

setTimeout(function(){ traverse(document.body); }, 2000);