Load the ISSUES?.md file content as the default issue body

github.com.js

// A crazy dotjs hack
// https://twitter.com/johnbender/status/131123843812179968
// You need to generate an OAuth token: http://developer.github.com/v3/oauth/#oauth-authorizations-api

var functionToLocation = function (fn) {
  $(function () {
    var js = fn.toString().replace(/\n/g, " ");
    console.log(js);
    window.location = "javascript: (" + js + ")()";
  });
};


if (window.location.pathname.match(/issues\/new/)) {
  // Base64 decoder from http://decodebase64.com/
  functionToLocation(function () {
    var token = "PUT AN OAUTH TOKEN HERE";

    var b64array = "ABCDEFGHIJKLM" +
                   "NOPQRSTUVWXYZ" +
                   "abcdefghijklm" +
                   "nopqrstuvwxyz" +
                   "0123456789+/=";

    var decode64 = function (input) {
      var output = "";
      var hex = "";
      var chr1, chr2, chr3 = "";
      var enc1, enc2, enc3, enc4 = "";
      var i = 0;

      var base64test = /[^A-Za-z0-9\+\/\=\n]/g;
      if (base64test.exec(input)) {
        throw("There were invalid base64 characters in the input text.\n" +
            "Valid base64 characters are A-Z, a-z, 0-9, '+', '/',and '='\n" +
            "Expect errors in decoding.");
      }
      input = input.replace(/[^A-Za-z0-9\+\/\=]/g, "");

      do {
        enc1 = b64array.indexOf(input.charAt(i++));
        enc2 = b64array.indexOf(input.charAt(i++));
        enc3 = b64array.indexOf(input.charAt(i++));
        enc4 = b64array.indexOf(input.charAt(i++));

        chr1 = (enc1 << 2) | (enc2 >> 4);
        chr2 = ((enc2 & 15) << 4) | (enc3 >> 2);
        chr3 = ((enc3 & 3) << 6) | enc4;

        output = output + String.fromCharCode(chr1);

        if (enc3 !== 64) {
          output = output + String.fromCharCode(chr2);
        }
        if (enc4 !== 64) {
          output = output + String.fromCharCode(chr3);
        }

        chr1 = chr2 = chr3 = "";
        enc1 = enc2 = enc3 = enc4 = "";

      } while (i < input.length);

      return unescape(output);
    };

    var req = function (prefix) {
      return $.ajax(prefix + "?access_token=" + token, {dataType: "jsonp"});
    };

    var log = function (message) {
      console.log(message);
    };

    var currentRepo = $(".js-current-repository").attr("href");

    req("https://api.github.com/repos" + currentRepo + "/git/refs/heads/master").done(function (ref) {
      var commitUrl = ref.data.object.url;
      log(commitUrl);
      req(commitUrl).done(function (commit) {
        var treeUrl = commit.data.tree.url;
        log(treeUrl);
        req(treeUrl).done(function (tree) {
          var blobUrl = null;
          $.each(tree.data.tree, function (i,obj) {
            log(JSON.stringify(obj));
            if (obj.type === "blob") {
              if (["ISSUE.md", "ISSUES.md"].indexOf(obj.path) !== -1) {
                blobUrl = obj.url;
              }
            }
          });
          if (blobUrl !== null) {
            req(blobUrl).done(function (blob) {
              var base64 = blob.data.content;
              log(base64);
              var body = decode64(base64);
              log(body);
              $("#js-new-issue-form textarea[name='issue[body]']").text(body);
            });
          }
        });
      });
    });
  });
}