github-html-viewer/index.html at main · ghviz/github-html-viewer · GitHub

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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>GitHub HTML Visualizer</title>
<style>
  * { box-sizing: border-box; margin: 0; padding: 0; }
  body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    background: #0d1117;
    color: #e6edf3;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
  }
  header {
    padding: 18px 24px;
    background: #161b22;
    border-bottom: 1px solid #30363d;
    display: flex;
    align-items: center;
    gap: 12px;
  }
  header h1 { font-size: 16px; font-weight: 600; }
  header span { font-size: 13px; color: #8b949e; }
  .star-btn {
    margin-left: auto;
    display: flex;
    align-items: center;
    gap: 6px;
    background: #21262d;
    border: 1px solid #30363d;
    color: #e6edf3;
    border-radius: 6px;
    padding: 5px 12px;
    font-size: 13px;
    font-weight: 600;
    text-decoration: none;
    transition: background .2s, border-color .2s;
  }
  .star-btn:hover { background: #30363d; border-color: #8b949e; }
  .star-btn svg { fill: #e3b341; }
  .input-bar {
    padding: 16px 24px;
    background: #161b22;
    border-bottom: 1px solid #30363d;
    display: flex;
    gap: 10px;
  }
  .url-input {
    flex: 1;
    background: #0d1117;
    border: 1px solid #30363d;
    border-radius: 6px;
    padding: 8px 14px;
    color: #e6edf3;
    font-size: 14px;
    outline: none;
    transition: border-color .2s;
  }
  .url-input::placeholder { color: #484f58; }
  .url-input:focus { border-color: #388bfd; }
  .btn {
    background: #238636;
    color: #fff;
    border: none;
    border-radius: 6px;
    padding: 8px 20px;
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    transition: background .2s;
  }
  .btn:hover { background: #2ea043; }
  .btn:disabled { background: #21262d; color: #484f58; cursor: not-allowed; }
  .status-bar {
    padding: 6px 24px;
    font-size: 12px;
    min-height: 28px;
    display: flex;
    align-items: center;
    gap: 8px;
  }
  .status-bar.error  { color: #f85149; }
  .status-bar.success{ color: #3fb950; }
  .status-bar.loading{ color: #58a6ff; }
  .spinner {
    width: 12px; height: 12px;
    border: 2px solid #30363d;
    border-top-color: #58a6ff;
    border-radius: 50%;
    animation: spin .7s linear infinite;
    display: none;
  }
  @keyframes spin { to { transform: rotate(360deg); } }
  .api-badge {
    padding: 4px 24px;
    background: #161b22;
    border-bottom: 1px solid #30363d;
    font-size: 11px;
    color: #484f58;
    display: none;
  }
  .api-badge a { color: #58a6ff; text-decoration: none; font-family: monospace; font-size: 11px; }
  .api-badge a:hover { text-decoration: underline; }
  iframe {
    flex: 1;
    border: none;
    display: none;
    min-height: calc(100vh - 130px);
    background: #fff;
  }
  .placeholder {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 14px;
    color: #484f58;
    background: #0d1117;
    min-height: calc(100vh - 130px);
  }
  .placeholder svg { opacity: .25; }
  .placeholder p   { font-size: 14px; }
  .placeholder code {
    font-size: 12px; background: #161b22;
    padding: 6px 14px; border-radius: 6px;
    border: 1px solid #30363d; color: #8b949e; font-family: monospace;
  }
</style>
</head>
<body>

<header>
  <svg width="22" height="22" viewBox="0 0 24 24" fill="#e6edf3">
    <path d="M12 0C5.37 0 0 5.37 0 12c0 5.31 3.435 9.795 8.205 11.385.6.105.825-.255.825-.57 0-.285-.015-1.23-.015-2.235-3.015.555-3.795-.735-4.035-1.41-.135-.345-.72-1.41-1.23-1.695-.42-.225-1.02-.78-.015-.795.945-.015 1.62.87 1.845 1.23 1.08 1.815 2.805 1.305 3.495.99.105-.78.42-1.305.765-1.605-2.67-.3-5.46-1.335-5.46-5.925 0-1.305.465-2.385 1.23-3.225-.12-.3-.54-1.53.12-3.18 0 0 1.005-.315 3.3 1.23.96-.27 1.98-.405 3-.405s2.04.135 3 .405c2.295-1.56 3.3-1.23 3.3-1.23.66 1.65.24 2.88.12 3.18.765.84 1.23 1.905 1.23 3.225 0 4.605-2.805 5.625-5.475 5.925.435.375.81 1.095.81 2.22 0 1.605-.015 2.895-.015 3.3 0 .315.225.69.825.57A12.02 12.02 0 0 0 24 12c0-6.63-5.37-12-12-12z"/>
  </svg>
  <h1>GitHub HTML Visualizer</h1>
  <span>— paste any GitHub .html blob URL to preview it live</span>
  <a class="star-btn" href="https://github.com/ghviz/github-html-viewer" target="_blank">
    <svg width="15" height="15" viewBox="0 0 24 24"><path d="M12 .587l3.668 7.431 8.2 1.192-5.934 5.782 1.4 8.168L12 18.896l-7.334 3.864 1.4-8.168L.132 9.21l8.2-1.192z"/></svg>
    Star on GitHub
  </a>
</header>

<div class="input-bar">
  <input id="urlInput" class="url-input" type="text"
    placeholder="https://github.com/user/repo/blob/main/file.html"
    value="https://github.com/shanraisshan/claude-code-best-practice/blob/main/presentation/index.html"/>
  <button class="btn" id="loadBtn" onclick="loadPreview()">Render ▶</button>
</div>

<div class="status-bar" id="statusBar">
  <div class="spinner" id="spinner"></div>
  <span id="statusText">Enter a GitHub HTML file URL above and click Render.</span>
</div>

<div class="api-badge" id="apiBadge">
  📡 Via GitHub API: <a id="apiLink" href="#" target="_blank"></a>
</div>

<div class="placeholder" id="placeholder">
  <svg width="60" height="60" viewBox="0 0 24 24" fill="#e6edf3">
    <path d="M14 2H6a2 2 0 0 0-2 2v16a2 2 0 0 0 2 2h12a2 2 0 0 0 2-2V8l-6-6zm-1 1.5L18.5 9H13V3.5zM6 20V4h5v7h7v9H6z"/>
  </svg>
  <p>No preview yet</p>
  <code>github.com/user/repo/blob/branch/file.html</code>
</div>

<iframe id="previewFrame" sandbox="allow-scripts allow-same-origin allow-forms"></iframe>

<script>
  document.getElementById('urlInput').addEventListener('keydown', e => {
    if (e.key === 'Enter') loadPreview();
  });

  // Parse a GitHub blob URL → { apiUrl, rawUrl }
  function parseGitHubUrl(input) {
    try {
      const url = new URL(input.trim());
      if (!url.hostname.includes('github.com')) return null;
      const m = url.pathname.match(/^\/([^/]+)\/([^/]+)\/blob\/([^/]+)\/(.+)$/);
      if (!m) return null;
      const [, owner, repo, branch, path] = m;
      return {
        apiUrl: `https://api.github.com/repos/${owner}/${repo}/contents/${path}?ref=${branch}`,
        rawUrl: `https://raw.githubusercontent.com/${owner}/${repo}/${branch}/${path}`
      };
    } catch { return null; }
  }

  function setStatus(msg, type = '') {
    const bar = document.getElementById('statusBar');
    document.getElementById('statusText').textContent = msg;
    document.getElementById('spinner').style.display = type === 'loading' ? 'block' : 'none';
    bar.className = 'status-bar' + (type ? ' ' + type : '');
  }

  async function loadPreview() {
    const parsed = parseGitHubUrl(document.getElementById('urlInput').value);
    const badge  = document.getElementById('apiBadge');
    const link   = document.getElementById('apiLink');
    const frame  = document.getElementById('previewFrame');
    const ph     = document.getElementById('placeholder');
    const btn    = document.getElementById('loadBtn');

    if (!parsed) {
      setStatus('⚠ Invalid URL — must be a GitHub blob URL: github.com/user/repo/blob/branch/file.html', 'error');
      return;
    }

    // Show API badge
    badge.style.display = 'block';
    link.href = link.textContent = parsed.apiUrl;

    btn.disabled = true;
    setStatus('Fetching via GitHub API…', 'loading');
    ph.style.display = 'none';
    frame.style.display = 'none';

    try {
      const res = await fetch(parsed.apiUrl, {
        headers: { Accept: 'application/vnd.github.v3+json' }
      });

      if (res.status === 403) throw new Error('Rate limit hit — try again in a minute, or the repo may be private.');
      if (res.status === 404) throw new Error('File not found — check the URL.');
      if (!res.ok) throw new Error(`GitHub API error ${res.status}`);

      const json = await res.json();
      if (!json.content) throw new Error('No content returned from GitHub API.');

      // GitHub returns base64 with newlines — strip them then decode
      const html = decodeURIComponent(
        atob(json.content.replace(/\n/g, ''))
          .split('')
          .map(c => '%' + c.charCodeAt(0).toString(16).padStart(2, '0'))
          .join('')
      );

      frame.srcdoc = html;
      frame.style.display = 'block';
      setStatus(`✓ Rendered successfully — ${(html.length / 1024).toFixed(1)} KB`, 'success');
    } catch (err) {
      ph.style.display = 'flex';
      setStatus(`✗ ${err.message}`, 'error');
    } finally {
      btn.disabled = false;
    }
  }
</script>
</body>
</html>