tools/html-to-markdown-clipboard.html at main · mathspp/tools · 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>Clipboard HTML to Markdown</title>
    <link rel="stylesheet" href="styles.css">
    <style>
        body {
            max-width: 960px;
            margin: 0 auto;
            padding: 24px 20px 48px;
        }

        .page-header {
            display: flex;
            flex-direction: column;
            gap: 0.5rem;
        }

        .site-link {
            font-weight: 600;
            color: var(--foreground-subtle);
            text-decoration: none;
        }

        .site-link:hover,
        .site-link:focus-visible {
            color: var(--foreground);
        }

        main {
            display: grid;
            gap: 1.5rem;
        }

        .tool-card {
            padding: clamp(1.25rem, 3vw, 2rem);
        }

        .tool-actions {
            display: flex;
            flex-wrap: wrap;
            gap: 0.75rem;
        }

        .grid {
            display: grid;
            gap: 1rem;
        }

        @media (min-width: 860px) {
            .grid {
                grid-template-columns: repeat(2, minmax(0, 1fr));
            }
        }

        textarea {
            font-family: var(--font-mono);
            min-height: 220px;
            resize: vertical;
        }

        .status {
            font-size: 0.95rem;
            color: var(--foreground-subtle);
        }

        .status.error {
            color: var(--re);
        }

        @media (max-width: 720px) {
            body {
                padding: 20px 16px 40px;
            }
        }
    </style>
</head>

<body>
    <header class="page-header">
        <a class="site-link" href="https://tools.mathspp.com/" aria-label="Back to tools.mathspp.com">← tools.mathspp.com</a>
        <h1>Clipboard HTML to Markdown</h1>
        <p class="lead">Paste rich HTML from your clipboard and get clean Markdown that you can copy instantly.</p>
    </header>

    <main>
        <section class="surface tool-card">
            <div class="tool-actions">
                <button type="button" id="paste-button">Paste from clipboard</button>
                <button type="button" id="copy-button">Copy Markdown</button>
            </div>
            <p class="status" id="status">Waiting for clipboard input.</p>
        </section>

        <section class="surface tool-card">
            <div class="grid">
                <div>
                    <label for="source-input">Clipboard contents (HTML or text)</label>
                    <textarea id="source-input" placeholder="Paste rich HTML here or click the button to pull from your clipboard."></textarea>
                </div>
                <div>
                    <label for="markdown-output">Markdown output</label>
                    <textarea id="markdown-output" readonly placeholder="Markdown will appear here."></textarea>
                </div>
            </div>
        </section>
    </main>

    <script src="https://cdn.jsdelivr.net/npm/turndown@7.1.2/dist/turndown.js"></script>
    <script>
        (function () {
            const pasteButton = document.getElementById('paste-button');
            const copyButton = document.getElementById('copy-button');
            const sourceInput = document.getElementById('source-input');
            const markdownOutput = document.getElementById('markdown-output');
            const status = document.getElementById('status');

            const turndownService = new TurndownService({
                codeBlockStyle: 'fenced',
                headingStyle: 'atx'
            });

            const isProbablyHtml = (text) => /<\s*\/?[a-z][\s\S]*>/i.test(text);

            const setStatus = (message, isError = false) => {
                status.textContent = message;
                status.classList.toggle('error', isError);
            };

            const updateMarkdown = (source, preferHtml = false) => {
                if (!source) {
                    markdownOutput.value = '';
                    setStatus('Waiting for clipboard input.');
                    return;
                }

                const treatAsHtml = preferHtml || isProbablyHtml(source);
                if (treatAsHtml) {
                    markdownOutput.value = turndownService.turndown(source);
                    setStatus('Converted HTML to Markdown.');
                } else {
                    markdownOutput.value = source;
                    setStatus('Using plain text from clipboard.');
                }
            };

            pasteButton.addEventListener('click', async () => {
                try {
                    if (!navigator.clipboard || !navigator.clipboard.read) {
                        setStatus('Clipboard read is not supported in this browser.', true);
                        return;
                    }
                    const items = await navigator.clipboard.read();
                    let html = '';
                    let text = '';

                    for (const item of items) {
                        if (item.types.includes('text/html')) {
                            const blob = await item.getType('text/html');
                            html = await blob.text();
                            break;
                        }
                        if (item.types.includes('text/plain') && !text) {
                            const blob = await item.getType('text/plain');
                            text = await blob.text();
                        }
                    }

                    const source = html || text;
                    sourceInput.value = source;
                    updateMarkdown(source, Boolean(html));
                } catch (error) {
                    setStatus(`Clipboard read failed: ${error.message}`, true);
                }
            });

            copyButton.addEventListener('click', async () => {
                const text = markdownOutput.value;
                if (!text) {
                    setStatus('Nothing to copy yet.', true);
                    return;
                }
                try {
                    await navigator.clipboard.writeText(text);
                    const original = copyButton.textContent;
                    copyButton.textContent = 'Copied!';
                    setStatus('Markdown copied to clipboard.');
                    setTimeout(() => {
                        copyButton.textContent = original;
                    }, 1600);
                } catch (error) {
                    setStatus(`Copy failed: ${error.message}`, true);
                }
            });

            sourceInput.addEventListener('paste', (event) => {
                const html = event.clipboardData?.getData('text/html');
                const text = event.clipboardData?.getData('text/plain');
                if (html || text) {
                    event.preventDefault();
                    const source = html || text;
                    sourceInput.value = source;
                    updateMarkdown(source, Boolean(html));
                }
            });

            sourceInput.addEventListener('input', () => {
                updateMarkdown(sourceInput.value, false);
            });
        })();
    </script>

    <footer class="page-footer">
        <p>Built with ❤️, 🤖, and 🐍, by <a href="https://mathspp.com/">Rodrigo Girão Serrão</a></p>
    </footer>
</body>

</html>