time/ventures/deck-preview/index.html

<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Deck Preview — markdown in, slides out, nothing leaves your browser</title>
<style>
  :root {
    --bg: #0f1115;
    --panel: #171a21;
    --panel-2: #1e222b;
    --ink: #e8eaf0;
    --ink-dim: #9aa1af;
    --accent: #6ea8fe;
    --accent-2: #9d7bff;
    --line: #2a2f3a;
    --radius: 12px;
  }
  * { box-sizing: border-box; }
  html, body { height: 100%; }
  body {
    margin: 0;
    font-family: ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    background: var(--bg);
    color: var(--ink);
    display: flex;
    flex-direction: column;
    min-height: 100vh;
  }
  header {
    padding: 18px 20px 10px;
  }
  header h1 {
    margin: 0;
    font-size: 1.35rem;
    letter-spacing: 0.2px;
  }
  header h1 .dot { color: var(--accent); }
  header p {
    margin: 6px 0 0;
    color: var(--ink-dim);
    font-size: 0.9rem;
    max-width: 62ch;
  }
  main {
    flex: 1;
    display: grid;
    grid-template-columns: minmax(280px, 420px) 1fr;
    gap: 14px;
    padding: 12px 20px 16px;
    min-height: 0;
  }
  .editor-pane {
    display: flex;
    flex-direction: column;
    min-height: 0;
  }
  .editor-pane label {
    font-size: 0.78rem;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--ink-dim);
    margin-bottom: 6px;
  }
  textarea {
    flex: 1;
    min-height: 220px;
    resize: none;
    background: var(--panel);
    color: var(--ink);
    border: 1px solid var(--line);
    border-radius: var(--radius);
    padding: 14px;
    font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
    font-size: 0.9rem;
    line-height: 1.55;
    outline: none;
  }
  textarea:focus { border-color: var(--accent); }
  .hint {
    margin-top: 8px;
    font-size: 0.78rem;
    color: var(--ink-dim);
    line-height: 1.5;
  }
  .hint code {
    background: var(--panel-2);
    border: 1px solid var(--line);
    border-radius: 5px;
    padding: 1px 5px;
    font-size: 0.75rem;
  }
  .stage {
    display: flex;
    flex-direction: column;
    min-height: 0;
  }
  .toolbar {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-bottom: 10px;
    flex-wrap: wrap;
  }
  button {
    background: var(--panel-2);
    color: var(--ink);
    border: 1px solid var(--line);
    border-radius: 9px;
    padding: 8px 14px;
    font-size: 0.85rem;
    cursor: pointer;
    touch-action: manipulation;
  }
  button:hover { border-color: var(--accent); }
  button:disabled { opacity: 0.4; cursor: default; }
  button.primary {
    background: linear-gradient(135deg, var(--accent), var(--accent-2));
    color: #0b0d12;
    font-weight: 600;
    border: none;
  }
  .counter {
    margin-left: auto;
    font-variant-numeric: tabular-nums;
    color: var(--ink-dim);
    font-size: 0.85rem;
  }
  .progress {
    height: 5px;
    background: var(--panel-2);
    border-radius: 99px;
    overflow: hidden;
    margin-bottom: 10px;
  }
  .progress > div {
    height: 100%;
    width: 0;
    background: linear-gradient(90deg, var(--accent), var(--accent-2));
    transition: width 180ms ease;
  }
  .slide-wrap {
    flex: 1;
    min-height: 0;
    border: 1px solid var(--line);
    border-radius: var(--radius);
    background:
      radial-gradient(1200px 500px at 80% -10%, rgba(110,168,254,0.10), transparent),
      radial-gradient(900px 500px at 0% 110%, rgba(157,123,255,0.10), transparent),
      var(--panel);
    overflow-y: auto;
    touch-action: pan-y;
  }
  .slide {
    padding: clamp(22px, 5vw, 56px);
    min-height: 100%;
    display: flex;
    flex-direction: column;
    justify-content: center;
  }
  .slide h1 {
    font-size: clamp(1.6rem, 4.5vw, 3rem);
    margin: 0 0 0.5em;
    line-height: 1.15;
  }
  .slide h2 {
    font-size: clamp(1.2rem, 3vw, 1.9rem);
    margin: 0 0 0.6em;
    color: var(--ink-dim);
    font-weight: 500;
  }
  .slide ul {
    margin: 0;
    padding-left: 1.3em;
    font-size: clamp(1rem, 2.2vw, 1.35rem);
    line-height: 1.7;
  }
  .slide p {
    font-size: clamp(1rem, 2.2vw, 1.35rem);
    line-height: 1.7;
    margin: 0.3em 0;
  }
  .slide .empty { color: var(--ink-dim); font-style: italic; }
  .slide code, .export-note code {
    background: rgba(110,168,254,0.12);
    border-radius: 5px;
    padding: 1px 6px;
    font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
    font-size: 0.9em;
  }
  .export-note {
    font-size: 0.78rem;
    color: var(--ink-dim);
    margin-top: 8px;
  }
  footer {
    padding: 10px 20px 16px;
    font-size: 0.8rem;
    color: var(--ink-dim);
  }
  footer a { color: var(--accent); text-decoration: none; }
  footer a:hover { text-decoration: underline; }
  @media (max-width: 820px) {
    main {
      grid-template-columns: 1fr;
      grid-template-rows: auto 1fr;
    }
    textarea { min-height: 150px; flex: none; }
    .slide-wrap { min-height: 300px; }
  }
</style>
</head>
<body>
<header>
  <h1>Deck Preview<span class="dot">.</span></h1>
  <p>Type markdown-ish slides on the left, watch them render live on the right.
     Navigate with arrow keys or swipe. Everything runs in your browser — nothing is saved or sent anywhere.</p>
</header>
<main>
  <section class="editor-pane">
    <label for="src">Slides</label>
    <textarea id="src" spellcheck="false"></textarea>
    <p class="hint">
      <code># Title</code> heading · <code>## Subtitle</code> · <code>- bullet</code> point ·
      <code>---</code> on its own line starts a new slide · inline <code>**bold**</code>, <code>*italic*</code>, <code>`code`</code>.
      Plain lines become paragraphs.
    </p>
  </section>
  <section class="stage">
    <div class="toolbar">
      <button id="prev" aria-label="Previous slide">&larr; Prev</button>
      <button id="next" aria-label="Next slide">Next &rarr;</button>
      <button id="copy" class="primary">Copy deck as HTML</button>
      <span class="counter" id="counter">1 / 1</span>
    </div>
    <div class="progress" role="progressbar" aria-label="Deck progress"><div id="bar"></div></div>
    <div class="slide-wrap" id="wrap"><article class="slide" id="slide"></article></div>
    <p class="export-note">The copied file is a self-contained deck: open it in any browser and use &larr; / &rarr; to present.</p>
  </section>
</main>
<footer>built by the <a href="https://github.com/teahubxyz/time">Time venture loop</a></footer>
<script>
(function () {
  "use strict";
  var src = document.getElementById("src");
  var slideEl = document.getElementById("slide");
  var counterEl = document.getElementById("counter");
  var barEl = document.getElementById("bar");
  var wrap = document.getElementById("wrap");
  var prevBtn = document.getElementById("prev");
  var nextBtn = document.getElementById("next");
  var copyBtn = document.getElementById("copy");

  var SAMPLE = [
    "# Deck Preview",
    "## Markdown in, slides out",
    "",
    "- Type on the left, slides render live",
    "- Navigate with arrow keys or swipe",
    "- Nothing is saved or sent anywhere",
    "",
    "---",
    "# A simple syntax",
    "",
    "- `#` and `##` for titles and subtitles",
    "- `-` or `*` for bullet points",
    "- `---` on its own line starts a new slide",
    "- Inline **bold**, *italic* and `code`",
    "",
    "---",
    "# Take it with you",
    "",
    "Press *Copy deck as HTML* and you get one self-contained file.",
    "Open it in any browser and present with the arrow keys.",
    "",
    "---",
    "# That's it",
    "",
    "- No accounts",
    "- No servers",
    "- Just your words, as slides"
  ].join("\n");

  function esc(s) {
    return s.replace(/&/g, "&amp;").replace(/</g, "&lt;").replace(/>/g, "&gt;");
  }

  function inline(s) {
    var out = esc(s);
    out = out.replace(/\*\*([^*]+)\*\*/g, "<strong>$1</strong>");
    out = out.replace(/\*([^*]+)\*/g, "<em>$1</em>");
    out = out.replace(/`([^`]+)`/g, "<code>$1</code>");
    return out;
  }

  // Split raw text into slides on lines that are only "---".
  function splitSlides(text) {
    var lines = text.split(/\r?\n/);
    var slides = [[]];
    for (var i = 0; i < lines.length; i++) {
      if (/^\s*---+\s*$/.test(lines[i])) {
        slides.push([]);
      } else {
        slides[slides.length - 1].push(lines[i]);
      }
    }
    return slides;
  }

  // Render one slide's lines to HTML.
  function renderSlide(lines) {
    var html = "";
    var inList = false;
    var hasContent = false;
    for (var i = 0; i < lines.length; i++) {
      var line = lines[i];
      var t = line.trim();
      if (t === "") {
        if (inList) { html += "</ul>"; inList = false; }
        continue;
      }
      hasContent = true;
      if (t.indexOf("# ") === 0) {
        if (inList) { html += "</ul>"; inList = false; }
        html += "<h1>" + inline(t.slice(2)) + "</h1>";
      } else if (t.indexOf("## ") === 0) {
        if (inList) { html += "</ul>"; inList = false; }
        html += "<h2>" + inline(t.slice(3)) + "</h2>";
      } else if (t.indexOf("- ") === 0 || t.indexOf("* ") === 0) {
        if (!inList) { html += "<ul>"; inList = true; }
        html += "<li>" + inline(t.slice(2)) + "</li>";
      } else {
        if (inList) { html += "</ul>"; inList = false; }
        html += "<p>" + inline(t) + "</p>";
      }
    }
    if (inList) html += "</ul>";
    if (!hasContent) html = '<p class="empty">(empty slide)</p>';
    return html;
  }

  var slides = [];
  var current = 0;

  function parse() {
    slides = splitSlides(src.value);
    if (slides.length === 0) slides = [[]];
    if (current >= slides.length) current = slides.length - 1;
    if (current < 0) current = 0;
    render();
  }

  function render() {
    slideEl.innerHTML = renderSlide(slides[current]);
    counterEl.textContent = (current + 1) + " / " + slides.length;
    var pct = slides.length <= 1 ? 100 : (current / (slides.length - 1)) * 100;
    barEl.style.width = pct + "%";
    prevBtn.disabled = current === 0;
    nextBtn.disabled = current === slides.length - 1;
  }

  function go(delta) {
    var next = current + delta;
    if (next < 0 || next > slides.length - 1) return;
    current = next;
    render();
  }

  src.addEventListener("input", parse);
  prevBtn.addEventListener("click", function () { go(-1); });
  nextBtn.addEventListener("click", function () { go(1); });

  document.addEventListener("keydown", function (e) {
    if (e.target === src) return; // don't steal keys while typing
    if (e.key === "ArrowRight" || e.key === "PageDown" || e.key === " ") { e.preventDefault(); go(1); }
    else if (e.key === "ArrowLeft" || e.key === "PageUp") { e.preventDefault(); go(-1); }
    else if (e.key === "Home") { current = 0; render(); }
    else if (e.key === "End") { current = slides.length - 1; render(); }
  });

  // Swipe navigation.
  var touchX = null;
  wrap.addEventListener("touchstart", function (e) { touchX = e.touches[0].clientX; }, { passive: true });
  wrap.addEventListener("touchend", function (e) {
    if (touchX === null) return;
    var dx = e.changedTouches[0].clientX - touchX;
    if (Math.abs(dx) > 40) go(dx < 0 ? 1 : -1);
    touchX = null;
  }, { passive: true });

  // Build the self-contained export deck.
  function buildExport() {
    var slidesHtml = slides.map(function (s) {
      return '<section class="s">' + renderSlide(s) + "</section>";
    }).join("\n");
    return "<!DOCTYPE html>\n<html lang=\"en\">\n<head>\n<meta charset=\"UTF-8\">\n" +
      "<meta name=\"viewport\" content=\"width=device-width, initial-scale=1.0\">\n" +
      "<title>Deck</title>\n<style>\n" +
      "*{box-sizing:border-box}html,body{height:100%;margin:0}" +
      "body{font-family:ui-sans-serif,system-ui,-apple-system,'Segoe UI',Roboto,sans-serif;background:#0f1115;color:#e8eaf0;display:flex;flex-direction:column}" +
      ".bar{height:5px;background:#1e222b}.bar>div{height:100%;width:0;background:linear-gradient(90deg,#6ea8fe,#9d7bff);transition:width .18s ease}" +
      "main{flex:1;overflow-y:auto}" +
      ".s{display:none;padding:clamp(24px,6vw,64px);min-height:100%;flex-direction:column;justify-content:center}" +
      ".s.on{display:flex}" +
      "h1{font-size:clamp(1.8rem,5vw,3.2rem);margin:0 0 .5em;line-height:1.15}" +
      "h2{font-size:clamp(1.2rem,3vw,1.9rem);color:#9aa1af;font-weight:500;margin:0 0 .6em}" +
      "ul{margin:0;padding-left:1.3em;font-size:clamp(1.1rem,2.5vw,1.5rem);line-height:1.7}" +
      "p{font-size:clamp(1.1rem,2.5vw,1.5rem);line-height:1.7;margin:.3em 0}" +
      "code{background:rgba(110,168,254,.12);border-radius:5px;padding:1px 6px;font-family:ui-monospace,Menlo,Consolas,monospace;font-size:.9em}" +
      ".empty{color:#9aa1af;font-style:italic}" +
      ".n{position:fixed;bottom:12px;right:16px;color:#9aa1af;font-size:.85rem;font-variant-numeric:tabular-nums}" +
      "\n</style>\n</head>\n<body>\n<div class=\"bar\"><div id=\"b\"></div></div>\n<main>\n" +
      slidesHtml +
      "\n</main>\n<div class=\"n\" id=\"n\"></div>\n<script>\n" +
      "var s=document.querySelectorAll('.s'),i=0,n=document.getElementById('n'),b=document.getElementById('b');\n" +
      "function show(){for(var k=0;k<s.length;k++)s[k].classList.toggle('on',k===i);n.textContent=(i+1)+' / '+s.length;b.style.width=(s.length<=1?100:i/(s.length-1)*100)+'%';}\n" +
      "function go(d){var j=i+d;if(j<0||j>s.length-1)return;i=j;show();}\n" +
      "document.addEventListener('keydown',function(e){if(e.key==='ArrowRight'||e.key===' '||e.key==='PageDown'){e.preventDefault();go(1);}else if(e.key==='ArrowLeft'||e.key==='PageUp'){e.preventDefault();go(-1);}else if(e.key==='Home'){i=0;show();}else if(e.key==='End'){i=s.length-1;show();}});\n" +
      "var x=null;document.addEventListener('touchstart',function(e){x=e.touches[0].clientX;},{passive:true});" +
      "document.addEventListener('touchend',function(e){if(x===null)return;var d=e.changedTouches[0].clientX-x;if(Math.abs(d)>40)go(d<0?1:-1);x=null;},{passive:true});\n" +
      "show();\n<\/script>\n</body>\n</html>";
  }

  copyBtn.addEventListener("click", function () {
    var html = buildExport();
    var done = function () {
      var old = copyBtn.textContent;
      copyBtn.textContent = "Copied!";
      setTimeout(function () { copyBtn.textContent = old; }, 1500);
    };
    if (navigator.clipboard && navigator.clipboard.writeText) {
      navigator.clipboard.writeText(html).then(done, function () { fallbackCopy(html, done); });
    } else {
      fallbackCopy(html, done);
    }
  });

  function fallbackCopy(text, done) {
    var ta = document.createElement("textarea");
    ta.value = text;
    ta.style.position = "fixed";
    ta.style.opacity = "0";
    document.body.appendChild(ta);
    ta.select();
    try { document.execCommand("copy"); done(); } catch (e) { /* give up quietly */ }
    document.body.removeChild(ta);
  }

  src.value = SAMPLE;
  parse();
})();
</script>
</body>
</html>