0mg's anagolf setting

anagolf.js

// ==UserScript==
// @include http://golf.shinh.org/*
// ==/UserScript==

addEventListener("DOMNodeInserted", function fn(e) {
  /* set default language */
  var lang = document.getElementsByName("ext")[0];
  if (lang) {
    lang.value = "js";
    removeEventListener(e.type, fn);
  }
});
addEventListener("DOMContentLoaded", function() {
  /* set default my name */
  var myname = "0mg";
  var namebox = document.getElementsByName("user")[0];
  if (namebox) namebox.value = myname;
  /* set statistics */
  var stat = document.getElementsByName("reveal")[0];
  if (stat) stat.checked = true;
});
addEventListener("submit", function(e) {
  /* replace CRLF to LF in textarea[name=code] */
  var code = document.querySelector("[name=code]");
  if (!code || code.value.indexOf("\n") === -1) return;
  var xhr = new XMLHttpRequest;
  var fd = new FormData;
  var qs = document.querySelectorAll("form *[name]");
  [].forEach.call(qs, function(e) {
    fd.append(e.name,
      e.name === "code" ? e.value.replace(/\r\n/g, "\n"): e.value);
  });
  xhr.open("post", "submit.rb", true);
  xhr.addEventListener("load", function() {
    document.open();
    document.write(xhr.responseText);
    document.close();
  });
  xhr.send(fd);
  var timer = setInterval(function() {
    if (xhr.readyState < 4) {
      if (!confirm("continue?")) {
        xhr.abort();
        clearInterval(timer);
      }
    } else {
      clearInterval(timer);
    }
  }, 5000);
  e.preventDefault();
});
if (location.href.indexOf("http://golf.shinh.org/l.rb?") === 0) {
  /* show only (post mortem) Results by a language */
  addEventListener("DOMContentLoaded", function() {
    /* add CSS <style> */
    var style = document.createElement("style");
    style.textContent = ".endless,.active{display:none}";
    document.head.appendChild(style);
    /* add <button> for toggle CSS */
    var btn = document.createElement("button");
    btn.dataset.postMortem = 1;
    btn.textContent = "post mortem <-> all";
    btn.addEventListener("click", function() {
      if (btn.dataset.postMortem ^= 1) {
        style.textContent = ".endless,.active{display:none}";
      } else {
        style.textContent = "";
      }
    });
    document.querySelector("#ldata").appendChild(btn);
    /* wrap {h2 + table}s with <section>s */
    var h2s = document.querySelectorAll("#ldata h2");
    [].forEach.call(h2s, function(h2) {
      var section = document.createElement("section");
      var ranking = h2.nextSibling;
      document.querySelector("#ldata").appendChild(section);
      section.classList.add(
        h2.lastChild.nodeValue === " (endless)" ? "endless" :
        h2.lastChild.nodeValue === " (post mortem)" ? "postMortem" : "active"
      );
      section.appendChild(h2);
      section.appendChild(ranking);
    });
  });
}