edit.js

var QS = document.querySelector.bind(document)
var QSS = document.querySelectorAll.bind(document)

var DATA_PREFIX = 'data:text/html;base64,'
var DATA_PREFIX_8 = 'data:text/html;charset=utf-8;base64,'
var DATA_PREFIX_BXZE = 'data:text/html;charset=utf-8;bxze64,'

var b = document.documentElement.setAttribute('data-useragent',  navigator.userAgent);

var importedFileData = undefined;

var content = undefined
window.onload = function() {
  window.onpopstate = function(e) { setContent(e.state) }
  window.onhashchange = function(e) { console.log("hash", e); location.reload() }
  document.body.onclick = function(e) { if (e.target == document.body) content.focus() };
  content = document.getElementById("content");
  content.ondragenter = function(e) { document.body.classList.add("drag"); };
  content.ondragleave = function(e) { document.body.classList.remove("drag"); };
  content.addEventListener('keydown', handleKey);
  content.addEventListener('keyup', handleInput);
  QS("#doc-title").addEventListener('keyup', handleInput);
  content.addEventListener('drop', handleDrop);
  content.addEventListener('paste', handlePaste)
  content.contentEditable = 'true';
  content.focus();
  document.execCommand('selectAll',false,null);
  QS('#qrcode').onclick = makeQRCode
  QS('#twitter').onclick = copyThenLink
  QS('#copy').onclick = copyLink
  QS('#menu').onclick = toggleMenu
  var hash = window.location.hash.substring(1)
  
  if (hash.length) {
    var slashIndex = hash.indexOf("/");
    var title = hash.substring(0, slashIndex)
    if (title.length) QS("#doc-title").innerText = document.title = decodeURIComponent(title.replace(/_/g, " "));
    hash = hash.substring(slashIndex + 1);
    updateLink(hash, title)
    if (hash.startsWith('?')) {
      hash = hash.substring(1)
      zipToString(hash, setContent);
    }
  } else {
    updateBodyClass()
  }
};

function setContent(html) {
  content.innerHTML = html
  updateBodyClass()
}

function setFileName(name) {
  QS("#doc-file").innerText = name
  if (name.length) {
    setContent(''); 
    document.body.classList.add("edited")
  }
}


function updateBodyClass() {
  var length = content.innerText.length;
  if (length || importedFileData) {
    document.body.classList.add("edited")
  } else {
    document.body.classList.remove("edited")
  }
  document.body.classList.add("loaded")
}

function handleDrop(e) {
  e.preventDefault();
  if (e.dataTransfer.files) {
    var file = e.dataTransfer.files[0];
    var reader = new FileReader();
    reader.addEventListener("load", function () {
      var url = reader.result;
      url = url.replace(DATA_PREFIX, DATA_PREFIX_8)
      compressDataURI(url, function(url2){
        var ratio = url2.length / url.length
        console.log("Compressed to", ratio)
         if (e.ctrlKey) decompressDataURI(url2, undefined, function(url3) {
          console.log("Verified", url == url3)
        })
        if (ratio > 0.95) url2 = url;
        if (e.altKey) url2 = url2.replace(DATA_PREFIX_BXZE, "!")
        
        importedFileData = url2
        updateLink(url2, file.name, true)
        setFileName('📄' + file.name)
      })
    }, false);
    reader.readAsDataURL(file);
  }
  document.body.classList.remove("drag")
}

// TODO Command+Shift+T for title (H1), Command+Shift+H for headline (H2), Command+Shift+B for body text (remove any of the above)
function handleKey(e) {
  var code = e.which;
  var handled = false;
  if (e.metaKey && e.altKey) {
    handled = true;
    if (code == '1'.charCodeAt(0)) {
      document.execCommand("formatBlock", true, "<h1>");
    } else if (code == '2'.charCodeAt(0)) {
      document.execCommand("formatBlock", true, "<h2>");
    } else if (code == 220) { // \
      document.execCommand("removeFormat");
    } else if (code == '0'.charCodeAt(0)) {
      document.execCommand("formatBlock", true, "");
    } else {
      handled = false
    }
  } else if (e.metaKey) {
    if (code == 'K'.charCodeAt(0)) {
      handled = true;
      var url = prompt("Add a link", "")
      if (url) { document.execCommand("createLink", true, url); };
    }
  }
  if (handled) e.preventDefault()
};

var codepenRE = /(https:\/\/codepen\.io\/[\w]+\/(\w+)\/(\w+))/
function handlePaste(e) {
  var clipboard = window.clipboardData || e.clipboardData
  var text = clipboard.getData('Text') || clipboard.getData('text/plain')
  if (match = text.match(codepenRE)) {
    fetchCodepen(match[0])
  }
}

var TEMPLATE_MARKER = "/*use-itty-bitty-template*/"
function fetchCodepen(url) {
  var h, c, j;
  $.when(
    $.get({ url:url + ".html", cache: false }, function(html) { h = html; }),
    $.get({ url:url + ".css", cache: false }, function(css) { c = css; }),
    $.get({ url:url + ".js", cache: false }, function(js) { j = js; })
  ).then(function() {
    var useTemplate = c.indexOf(TEMPLATE_MARKER) >= 0
    var string = '<style type="text/css">' + c + '</style>' +  h + '<script type="text/javascript">' + j + '</script>'
    stringToZip(string, function(zip) {
      setFileName('✒️' + url)
      var title = QS("#doc-title").innerText;
      setTimeout(function() {
          var data = (useTemplate ? "" : DATA_PREFIX_BXZE) + zip;
          importedFileData = data;
          updateLink(data, title)
      }, 300);
    });
  });
}

function handleInput(e) {
  updateBodyClass();
  var text = content.innerText;
  var title = QS("#doc-title").innerText;

  var strip = false;
  if (text.indexOf("</") > 0) {
    text = text.replace(/[\n|\t]+/g,' ').replace(/> +</g, '> <')
  } else {
    text = content.innerHTML
    strip = true
  }
   
  if (text.trim().length) {
    stringToZip(text, function(zip) {
      updateLink("?" + zip, title)
    });
    setFileName("")
  } else if (importedFileData) {
    updateLink(importedFileData, title)
  } else {
    updateLink("")
  }

}

var maxLengths = {
  // "#twitter": 4088,
  // "#bitly": 2048,
  "#qrcode": 2953,
}

function updateLink(url, title, push) {
  if (title) title = encodeURIComponent(title.trim().replace(/\s/g, "_"))
  if (url.length) {
    url = "/#" + (title || "") + "/" + url
  } else {
    url = "/edit"
  }
  var hash = location.hash
  if (push || !hash || !hash.length) {
    window.history.pushState(content.innerHTML, null, url);
  } else {
    window.history.replaceState(content.innerHTML, null, url);
  }
  var length = location.href.length

  QS('#length').innerText = length + " bytes"
  QS('#length').href = url
  for (var key in maxLengths) {
    var maxLength = maxLengths[key]
    if (length > maxLength) {
      QS(key).classList.add("invalid")
    } else {
      QS(key).classList.remove("invalid")
    }
    
  };
  
}

function makeQRCode() {
  var url = "https://zxing.org/w/chart?cht=qr&chs=548x548&chld=L|1&choe=UTF-8&chl=" + encodeURIComponent(location.href)
  this.href = url
}

function toggleMenu() {
  QS("#toolbar").classList.toggle("menu-visible")
}
function copyThenLink() {
  copyLink()
  return confirm("Copied your link to the clipboard. Paste it to share.")
}
function copyLink() {
  var text = location.href
  var dummy = document.createElement("input");
  document.body.appendChild(dummy);
  dummy.value = text;
  dummy.select();
  document.execCommand("copy");
  document.body.removeChild(dummy);

  document.body.addClass("copied")
  setTimeout(function() {
    document.body.removeClass("copied")
  }, 300);
}

function saveLink() {
  var url = "/" + location.hash
  window.history.pushState(null, null, url);
  location.reload()   
}

function tweetLink() {
  var url = "https://twitter.com/intent/tweet?url=" + encodeURIComponent(location.href);
  window.open(url, '_blank');
}