📦 EqualifyEverything / equalify-hub

📄 markdown.ts · 231 lines
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231/**
 * Markdown renderer - converts markdown to HTML
 */

function escapeHtml(text: string): string {
    if (!text) return '';
    return text
        .replace(/&/g, '&amp;')
        .replace(/</g, '&lt;')
        .replace(/>/g, '&gt;')
        .replace(/"/g, '&quot;');
}

// Callout types with their styling (background, border, icon)
const CALLOUT_TYPES: Record<string, { bg: string; border: string; color: string; label: string }> = {
    tip: { bg: '#eff6ff', border: '#3b82f6', color: '#1e3a8a', label: 'Tip' },
    note: { bg: '#f3f4f6', border: '#6b7280', color: '#1f2937', label: 'Note' },
    important: { bg: '#fef3c7', border: '#f59e0b', color: '#713f12', label: 'Important' },
    warning: { bg: '#fee2e2', border: '#ef4444', color: '#7f1d1d', label: 'Warning' },
    success: { bg: '#dcfce7', border: '#22c55e', color: '#14532d', label: 'Success' },
};

// Convert GitHub blob URLs to raw URLs (for embedded images)
// e.g. https://github.com/Org/Repo/blob/SHA/path/file.png → https://raw.githubusercontent.com/Org/Repo/SHA/path/file.png
function rewriteGitHubBlobUrl(url: string): string {
    return url.replace(
        /^https:\/\/github\.com\/([^/]+)\/([^/]+)\/blob\/([^/]+)\/(.+)$/,
        'https://raw.githubusercontent.com/$1/$2/$3/$4'
    );
}

export function renderMarkdown(md: string): string {
    let html = md;

    // First pass: handle callout code blocks (```tip, ```important, ```warning, ```note, ```success)
    // Render them as styled callouts before the generic code block handler runs
    const callouts: string[] = [];
    html = html.replace(/```(tip|note|important|warning|success)\n([\s\S]*?)```/g, (_, type, content) => {
        const cfg = CALLOUT_TYPES[type];
        // Render markdown inside callout content (recursively, simply)
        const inner = renderInlineMarkdown(content.trim());
        const calloutHtml = `<div class="md-callout md-callout-${type}" style="background:${cfg.bg};border-left:4px solid ${cfg.border};color:${cfg.color};padding:12px 16px;margin:16px 0;border-radius:6px;">${inner}</div>`;
        callouts.push(calloutHtml);
        return `%%CALLOUT${callouts.length - 1}%%`;
    });

    // Preserve code blocks first (replace with placeholders)
    const codeBlocks: string[] = [];
    html = html.replace(/```(\w*)\n([\s\S]*?)```/g, (_, lang, code) => {
        codeBlocks.push(`<pre><code class="language-${lang || 'text'}">${escapeHtml(code.trim())}</code></pre>`);
        return `%%CODEBLOCK${codeBlocks.length - 1}%%`;
    });
    
    // Preserve inline code
    const inlineCode: string[] = [];
    html = html.replace(/`([^`]+)`/g, (_, code) => {
        inlineCode.push(`<code>${escapeHtml(code)}</code>`);
        return `%%INLINECODE${inlineCode.length - 1}%%`;
    });
    
    // Remove HTML comments (but keep other HTML)
    html = html.replace(/<!--[\s\S]*?-->/g, '');
    
    // Collect reference definitions: [ref]: url "title"
    const refs: Record<string, { url: string; title?: string }> = {};
    html = html.replace(/^\[([^\]]+)\]:\s*(\S+)(?:\s+"([^"]*)")?$/gm, (_, ref, url, title) => {
        refs[ref.toLowerCase()] = { url: url.trim(), title };
        return '';
    });
    
    // Handle images: ![alt](url "title") - must come before links
    html = html.replace(/!\[([^\]]*)\]\(([^)\s]+)(?:\s+"([^"]*)")?\)/g, (_, alt, url, title) => {
        const titleAttr = title ? ` title="${escapeHtml(title)}"` : '';
        return `<img src="${url}" alt="${escapeHtml(alt)}"${titleAttr} style="max-width:100%;">`;
    });
    
    // Reference-style images: ![alt][ref] or ![alt][]
    html = html.replace(/!\[([^\]]*)\]\[([^\]]*)\]/g, (_, alt, ref) => {
        const key = (ref || alt).toLowerCase();
        const r = refs[key];
        if (r) {
            const titleAttr = r.title ? ` title="${escapeHtml(r.title)}"` : '';
            return `<img src="${r.url}" alt="${escapeHtml(alt)}"${titleAttr} style="max-width:100%;">`;
        }
        return `![${alt}]`;
    });
    
    // Tables: detect by |---|---| pattern
    html = html.replace(/^(\|.+\|)\n(\|[-:\s|]+\|)\n((?:\|.+\|\n?)+)/gm, (_, header, sep, body) => {
        const alignments: string[] = [];
        sep.split('|').filter(Boolean).forEach((cell: string) => {
            const c = cell.trim();
            if (c.startsWith(':') && c.endsWith(':')) alignments.push('center');
            else if (c.endsWith(':')) alignments.push('right');
            else alignments.push('left');
        });
        
        const parseRow = (row: string, tag: string) => {
            const cells = row.split('|').filter(Boolean);
            return `<tr>${cells.map((c: string, i: number) => 
                `<${tag} style="text-align:${alignments[i] || 'left'}">${c.trim()}</${tag}>`
            ).join('')}</tr>`;
        };
        
        const headerRow = parseRow(header, 'th');
        const bodyRows = body.trim().split('\n').map((r: string) => parseRow(r, 'td')).join('');
        return `<table><thead>${headerRow}</thead><tbody>${bodyRows}</tbody></table>`;
    });
    
    // Headers (process inline markdown after)
    html = html.replace(/^######\s+(.+)$/gm, '<h6>$1</h6>');
    html = html.replace(/^#####\s+(.+)$/gm, '<h5>$1</h5>');
    html = html.replace(/^####\s+(.+)$/gm, '<h4>$1</h4>');
    html = html.replace(/^###\s+(.+)$/gm, '<h3>$1</h3>');
    html = html.replace(/^##\s+(.+)$/gm, '<h2>$1</h2>');
    html = html.replace(/^#\s+(.+)$/gm, '<h1>$1</h1>');
    
    // Horizontal rules
    html = html.replace(/^[-*_]{3,}\s*$/gm, '<hr>');
    
    // Blockquotes (handle multiple consecutive lines)
    html = html.replace(/^>\s*(.*)$/gm, '<blockquote>$1</blockquote>');
    html = html.replace(/<\/blockquote>\n<blockquote>/g, '<br>');
    
    // Bold and italic (must handle ** before *)
    html = html.replace(/\*\*\*(.+?)\*\*\*/g, '<strong><em>$1</em></strong>');
    html = html.replace(/\*\*(.+?)\*\*/g, '<strong>$1</strong>');
    html = html.replace(/(?<!\*)\*([^*\n]+)\*(?!\*)/g, '<em>$1</em>');
    html = html.replace(/___(.+?)___/g, '<strong><em>$1</em></strong>');
    html = html.replace(/__(.+?)__/g, '<strong>$1</strong>');
    html = html.replace(/(?<!_)_([^_\n]+)_(?!_)/g, '<em>$1</em>');
    
    // Strikethrough
    html = html.replace(/~~(.+?)~~/g, '<del>$1</del>');
    
    // Links: [text](url "title")
    html = html.replace(/\[([^\]]+)\]\(([^)\s]+)(?:\s+"([^"]*)")?\)/g, (_, text, url, title) => {
        const titleAttr = title ? ` title="${escapeHtml(title)}"` : '';
        return `<a href="${url}"${titleAttr} rel="noopener">${text}</a>`;
    });
    
    // Reference-style links: [text][ref] or [text][]
    html = html.replace(/\[([^\]]+)\]\[([^\]]*)\]/g, (_, text, ref) => {
        const key = (ref || text).toLowerCase();
        const r = refs[key];
        if (r) {
            const titleAttr = r.title ? ` title="${escapeHtml(r.title)}"` : '';
            return `<a href="${r.url}"${titleAttr} rel="noopener">${text}</a>`;
        }
        return `[${text}]`;
    });
    
    // Task lists: - [ ] or - [x]
    html = html.replace(/^(\s*)[-*+]\s+\[( |x)\]\s+(.+)$/gm, (_, indent, checked, text) => {
        const isChecked = checked === 'x' ? ' checked disabled' : ' disabled';
        return `${indent}<li class="task-list-item"><input type="checkbox"${isChecked}> ${text}</li>`;
    });
    
    // Unordered lists
    html = html.replace(/^(\s*)[-*+]\s+(.+)$/gm, '$1<li>$2</li>');
    
    // Ordered lists
    html = html.replace(/^(\s*)\d+\.\s+(.+)$/gm, '$1<li>$2</li>');
    
    // Wrap consecutive <li> in <ul>
    html = html.replace(/(<li[\s>][\s\S]*?<\/li>\n?)+/g, '<ul>$&</ul>');
    
    // Paragraphs
    html = html.replace(/\n\n+/g, '</p>\n<p>');
    html = '<p>' + html + '</p>';
    
    // Clean up: remove <p> wrapping block elements
    const blockTags = ['h1', 'h2', 'h3', 'h4', 'h5', 'h6', 'pre', 'ul', 'ol', 'blockquote', 'hr', 'table', 'div'];
    blockTags.forEach(tag => {
        html = html.replace(new RegExp(`<p>\\s*(<${tag}[\\s>])`, 'g'), '$1');
        html = html.replace(new RegExp(`(</${tag}>)\\s*</p>`, 'g'), '$1');
    });
    html = html.replace(/<p>\s*(<img\s)/g, '$1');
    html = html.replace(/<p>\s*(<a\s[^>]*id=)/g, '$1');
    html = html.replace(/<p>\s*<\/p>/g, '');
    
    // Restore code blocks and inline code
    codeBlocks.forEach((block, i) => {
        html = html.replace(`%%CODEBLOCK${i}%%`, block);
    });
    inlineCode.forEach((code, i) => {
        html = html.replace(`%%INLINECODE${i}%%`, code);
    });

    // Restore callouts (after paragraph wrapping)
    callouts.forEach((callout, i) => {
        html = html.replace(`%%CALLOUT${i}%%`, callout);
    });

    // Strip <p> wrappers around restored block elements
    html = html.replace(/<p>\s*(<div\s[^>]*class="md-callout[\s\S]*?<\/div>)\s*<\/p>/g, '$1');
    html = html.replace(/<p>\s*(<pre[\s>][\s\S]*?<\/pre>)\s*<\/p>/g, '$1');

    // Rewrite GitHub blob URLs in <img> tags to raw URLs (so embedded images actually load)
    html = html.replace(/<img\s+([^>]*?)src="([^"]+)"([^>]*?)>/g, (_, before, src, after) => {
        return `<img ${before}src="${rewriteGitHubBlobUrl(src)}"${after}>`;
    });

    return html;
}

// Lightweight inline markdown renderer for callout content
// Supports: bold, italic, links, inline code, line breaks
function renderInlineMarkdown(text: string): string {
    let html = text;
    // Inline code first
    const codes: string[] = [];
    html = html.replace(/`([^`]+)`/g, (_, code) => {
        codes.push(`<code>${escapeHtml(code)}</code>`);
        return `C${codes.length - 1}`;
    });
    // Links: [text](url)
    html = html.replace(/\[([^\]]+)\]\(([^)\s]+)(?:\s+"[^"]*")?\)/g, '<a href="$2" rel="noopener">$1</a>');
    // Bold and italic
    html = html.replace(/\*\*\*(.+?)\*\*\*/g, '<strong><em>$1</em></strong>');
    html = html.replace(/\*\*(.+?)\*\*/g, '<strong>$1</strong>');
    html = html.replace(/(?<!\*)\*([^*\n]+)\*(?!\*)/g, '<em>$1</em>');
    // Line breaks → <br>
    html = html.replace(/\n/g, '<br>');
    // Restore inline code
    codes.forEach((code, i) => {
        html = html.replace(`C${i}`, code);
    });
    return html;
}