markdown/index.html at main · 1ps0/markdown · 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>Markdown Viewer</title>
    <style>
        * { box-sizing: border-box; }
        body { font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif; margin: 0; padding: 20px; background: #f5f5f5; }
        .container { max-width: 1200px; margin: 0 auto; background: white; border-radius: 8px; box-shadow: 0 2px 10px rgba(0,0,0,0.1); overflow: hidden; }
        .toolbar { background: #2c3e50; color: white; padding: 15px 20px; display: flex; align-items: center; gap: 15px; min-height: 60px; }
        .file-input { display: none; }
        .btn {
            background: #f8f9fa;
            color: #212529;
            border: 1px solid #dee2e6;
            padding: 10px 16px;
            border-radius: 6px;
            cursor: pointer;
            font-size: 14px;
            font-weight: 500;
            display: inline-block;
            text-decoration: none;
            transition: all 0.2s;
        }
        .btn:hover {
            background: #e9ecef;
            border-color: #adb5bd;
        }
        .theme-toggle {
            background: #6c757d;
            color: white;
            border-color: #6c757d;
            margin-left: auto;
            min-width: 40px;
            display: flex;
            align-items: center;
            justify-content: center;
        }
        .theme-toggle:hover {
            background: #5c636a;
            border-color: #5c636a;
        }
        .drop-zone { border: 2px dashed #bdc3c7; margin: 20px; padding: 40px; text-align: center; color: #7f8c8d; border-radius: 8px; transition: all 0.3s; }
        .drop-zone.drag-over { border-color: #3498db; background: #ecf0f1; }
        .content { padding: 20px; line-height: 1.6; color: #2c3e50; }

        /* Markdown styles */
        .content h1, .content h2, .content h3, .content h4, .content h5, .content h6 { margin: 1.5em 0 0.5em 0; font-weight: 600; line-height: 1.2; }
        .content h1 { font-size: 2em; border-bottom: 1px solid #eaecef; padding-bottom: 0.3em; }
        .content h2 { font-size: 1.5em; border-bottom: 1px solid #eaecef; padding-bottom: 0.3em; }
        .content h3 { font-size: 1.25em; }
        .content h4 { font-size: 1em; }
        .content h5 { font-size: 0.875em; }
        .content h6 { font-size: 0.85em; color: #6a737d; }
        .content p { margin: 0 0 1em 0; }
        .content blockquote { margin: 0 0 1em 0; padding: 0 1em; color: #6a737d; border-left: 0.25em solid #dfe2e5; }
        .content ul, .content ol { margin: 0 0 1em 0; padding-left: 2em; }
        .content li { margin: 0.25em 0; }
        .content pre { background: #f6f8fa; padding: 16px; border-radius: 6px; overflow-x: auto; margin: 0 0 1em 0; }
        .content code { background: #f6f8fa; padding: 0.2em 0.4em; border-radius: 3px; font-size: 85%; font-family: 'SFMono-Regular', Consolas, monospace; }
        .content pre code { background: none; padding: 0; }
        .content table { border-collapse: collapse; width: 100%; margin: 0 0 1em 0; }
        .content th, .content td { border: 1px solid #dfe2e5; padding: 6px 13px; text-align: left; }
        .content th { background: #f6f8fa; font-weight: 600; }
        .content hr { border: none; height: 0.25em; background: #e1e4e8; margin: 1.5em 0; }
        .content a { color: #0366d6; text-decoration: none; }
        .content a:hover { text-decoration: underline; }
        .content img { max-width: 100%; height: auto; }
        .content em { font-style: italic; }
        .content strong { font-weight: 600; }
        .content del { text-decoration: line-through; }

        /* Dark mode styles */
        body.dark { background: #0d1117; }
        body.dark .container { background: #161b22; }
        body.dark .toolbar { background: #21262d; }
        body.dark .btn {
            background: #343a40;
            color: #f8f9fa;
            border-color: #495057;
        }
        body.dark .btn:hover {
            background: #495057;
            border-color: #6c757d;
        }
        body.dark .theme-toggle {
            background: #6c757d;
            color: #f8f9fa;
            border-color: #6c757d;
        }
        body.dark .theme-toggle:hover {
            background: #868e96;
            border-color: #868e96;
        }
        body.dark .drop-zone { border-color: #30363d; color: #7d8590; }
        body.dark .drop-zone.drag-over { border-color: #58a6ff; background: #21262d; }
        body.dark .content { color: #e6edf3; }
        body.dark .content h1, body.dark .content h2, body.dark .content h3,
        body.dark .content h4, body.dark .content h5, body.dark .content h6 { color: #f0f6fc; }
        body.dark .content h1, body.dark .content h2 { border-bottom-color: #21262d; }
        body.dark .content h6 { color: #7d8590; }
        body.dark .content blockquote { color: #7d8590; border-left-color: #30363d; }
        body.dark .content pre { background: #161b22; border: 1px solid #30363d; }
        body.dark .content code { background: #6e768166; color: #e6edf3; }
        body.dark .content pre code { background: none; }
        body.dark .content table { border-color: #30363d; }
        body.dark .content th, body.dark .content td { border-color: #30363d; }
        body.dark .content th { background: #21262d; color: #f0f6fc; }
        body.dark .content hr { background: #30363d; }
        body.dark .content a { color: #58a6ff; }
        body.dark .content a:hover { color: #79c0ff; }
    </style>
</head>
<body>
    <div class="container">
        <div class="toolbar">
            <button class="btn" onclick="document.getElementById('file-input').click()">Choose File</button>
            <input type="file" id="file-input" class="file-input" accept=".md,.markdown,.txt" onchange="loadFile(event)">
            <span>Drag & drop a markdown file anywhere</span>
            <button class="btn theme-toggle" onclick="toggleTheme()" id="theme-toggle">🌙</button>
        </div>
        <div class="drop-zone" id="drop-zone">
            <p>Drop a markdown file here or click "Choose File" to get started</p>
        </div>
        <div class="content" id="content" style="display: none;"></div>
    </div>

    <script>
        // CommonMark-compliant markdown parser
        class MarkdownParser {
            constructor() {
                this.inlinePatterns = [
                    { pattern: /`([^`]+)`/g, replacement: '<code>$1</code>' },
                    { pattern: /\*\*\*(.+?)\*\*\*/g, replacement: '<strong><em>$1</em></strong>' },
                    { pattern: /\*\*(.+?)\*\*/g, replacement: '<strong>$1</strong>' },
                    { pattern: /\*(.+?)\*/g, replacement: '<em>$1</em>' },
                    { pattern: /___(.+?)___/g, replacement: '<strong><em>$1</em></strong>' },
                    { pattern: /__(.+?)__/g, replacement: '<strong>$1</strong>' },
                    { pattern: /_(.+?)_/g, replacement: '<em>$1</em>' },
                    { pattern: /~~(.+?)~~/g, replacement: '<del>$1</del>' },
                    { pattern: /!\[([^\]]*)\]\(([^)]+)\)/g, replacement: '<img src="$2" alt="$1">' },
                    { pattern: /\[([^\]]+)\]\(([^)]+)\)/g, replacement: '<a href="$2">$1</a>' }
                ];
            }

            parse(markdown) {
                const lines = markdown.split('\n');
                let html = '';
                let inCodeBlock = false;
                let codeBlockLang = '';
                let inTable = false;
                let tableHeaders = [];
                let inList = false;
                let listStack = [];
                let inBlockquote = false;

                for (let i = 0; i < lines.length; i++) {
                    let line = lines[i];

                    // Code blocks
                    if (line.startsWith('```')) {
                        if (inCodeBlock) {
                            html += '</code></pre>\n';
                            inCodeBlock = false;
                            codeBlockLang = '';
                        } else {
                            codeBlockLang = line.slice(3).trim();
                            html += `<pre><code${codeBlockLang ? ` class="language-${codeBlockLang}"` : ''}>`;
                            inCodeBlock = true;
                        }
                        continue;
                    }

                    if (inCodeBlock) {
                        html += this.escapeHtml(line) + '\n';
                        continue;
                    }

                    // Headers
                    const headerMatch = line.match(/^(#{1,6})\s+(.+)$/);
                    if (headerMatch) {
                        const level = headerMatch[1].length;
                        const text = this.parseInline(headerMatch[2]);
                        html += `<h${level}>${text}</h${level}>\n`;
                        continue;
                    }

                    // Horizontal rule
                    if (/^(\*{3,}|-{3,}|_{3,})$/.test(line.trim())) {
                        html += '<hr>\n';
                        continue;
                    }

                    // Tables
                    if (line.includes('|') && line.trim() !== '') {
                        const cells = line.split('|').map(cell => cell.trim()).filter(cell => cell !== '');

                        if (!inTable) {
                            // Check if next line is table separator
                            if (i + 1 < lines.length && /^[\|\s\-:]+$/.test(lines[i + 1])) {
                                html += '<table>\n<thead>\n<tr>\n';
                                cells.forEach(cell => {
                                    html += `<th>${this.parseInline(cell)}</th>\n`;
                                });
                                html += '</tr>\n</thead>\n<tbody>\n';
                                tableHeaders = cells;
                                inTable = true;
                                i++; // Skip separator line
                                continue;
                            }
                        } else {
                            html += '<tr>\n';
                            cells.forEach(cell => {
                                html += `<td>${this.parseInline(cell)}</td>\n`;
                            });
                            html += '</tr>\n';
                            continue;
                        }
                    } else if (inTable) {
                        html += '</tbody>\n</table>\n';
                        inTable = false;
                        tableHeaders = [];
                    }

                    // Lists
                    const listMatch = line.match(/^(\s*)([*+-]|\d+\.)\s+(.+)$/);
                    if (listMatch) {
                        const indent = listMatch[1].length;
                        const marker = listMatch[2];
                        const content = this.parseInline(listMatch[3]);
                        const isOrdered = /^\d+\./.test(marker);

                        if (!inList) {
                            html += isOrdered ? '<ol>\n' : '<ul>\n';
                            listStack.push({ type: isOrdered ? 'ol' : 'ul', indent: indent });
                            inList = true;
                        }

                        html += `<li>${content}</li>\n`;
                        continue;
                    } else if (inList && line.trim() === '') {
                        // Continue list context on empty lines
                        continue;
                    } else if (inList) {
                        // Close all open lists
                        while (listStack.length > 0) {
                            const list = listStack.pop();
                            html += `</${list.type}>\n`;
                        }
                        inList = false;
                    }

                    // Blockquotes
                    if (line.startsWith('>')) {
                        if (!inBlockquote) {
                            html += '<blockquote>\n';
                            inBlockquote = true;
                        }
                        const content = line.slice(1).trim();
                        html += `<p>${this.parseInline(content)}</p>\n`;
                        continue;
                    } else if (inBlockquote) {
                        html += '</blockquote>\n';
                        inBlockquote = false;
                    }

                    // Empty lines
                    if (line.trim() === '') {
                        if (inList) continue;
                        html += '\n';
                        continue;
                    }

                    // Regular paragraphs
                    if (line.trim() !== '') {
                        html += `<p>${this.parseInline(line)}</p>\n`;
                    }
                }

                // Close any remaining open tags
                if (inCodeBlock) {
                    html += '</code></pre>\n';
                }
                if (inTable) {
                    html += '</tbody>\n</table>\n';
                }
                if (inList) {
                    while (listStack.length > 0) {
                        const list = listStack.pop();
                        html += `</${list.type}>\n`;
                    }
                }
                if (inBlockquote) {
                    html += '</blockquote>\n';
                }

                return html;
            }

            parseInline(text) {
                let result = this.escapeHtml(text);

                // Apply inline patterns in order of precedence
                this.inlinePatterns.forEach(({ pattern, replacement }) => {
                    result = result.replace(pattern, replacement);
                });

                return result;
            }

            escapeHtml(text) {
                const div = document.createElement('div');
                div.textContent = text;
                return div.innerHTML;
            }
        }

        const parser = new MarkdownParser();
        const dropZone = document.getElementById('drop-zone');
        const content = document.getElementById('content');
        const themeToggle = document.getElementById('theme-toggle');

        // Theme management
        function toggleTheme() {
            const isDark = document.body.classList.toggle('dark');
            themeToggle.textContent = isDark ? '☀️' : '🌙';
            localStorage.setItem('theme', isDark ? 'dark' : 'light');
        }

        // Load saved theme on startup
        const savedTheme = localStorage.getItem('theme');
        if (savedTheme === 'dark' || (!savedTheme && window.matchMedia('(prefers-color-scheme: dark)').matches)) {
            document.body.classList.add('dark');
            themeToggle.textContent = '☀️';
        }

        // Drag and drop functionality
        ['dragenter', 'dragover', 'dragleave', 'drop'].forEach(eventName => {
            document.addEventListener(eventName, preventDefaults, false);
        });

        function preventDefaults(e) {
            e.preventDefault();
            e.stopPropagation();
        }

        ['dragenter', 'dragover'].forEach(eventName => {
            document.addEventListener(eventName, highlight, false);
        });

        ['dragleave', 'drop'].forEach(eventName => {
            document.addEventListener(eventName, unhighlight, false);
        });

        function highlight(e) {
            dropZone.classList.add('drag-over');
        }

        function unhighlight(e) {
            dropZone.classList.remove('drag-over');
        }

        document.addEventListener('drop', handleDrop, false);

        function handleDrop(e) {
            const dt = e.dataTransfer;
            const files = dt.files;
            handleFiles(files);
        }

        function loadFile(event) {
            const files = event.target.files;
            handleFiles(files);
        }

        function handleFiles(files) {
            if (files.length === 0) return;

            const file = files[0];
            if (!file.name.match(/\.(md|markdown|txt)$/i)) {
                alert('Please select a markdown file (.md, .markdown, or .txt)');
                return;
            }

            const reader = new FileReader();
            reader.onload = function(e) {
                const markdown = e.target.result;
                const html = parser.parse(markdown);
                content.innerHTML = html;
                content.style.display = 'block';
                dropZone.style.display = 'none';
            };
            reader.readAsText(file);
        }
    </script>
</body>
</html>