Function parseFrontmatter

scripts/skill-lint.js:195–239

* Extract key-value pairs from a YAML-like frontmatter block. * Handles: string values, booleans, multiline (>-), and simple lists. * * @param {string} content - Full SKILL.md content * @returns {{ frontmatter: object|null, body: string }}

(content)

 * @returns {{ frontmatter: object|null, body: string }}
 */
function parseFrontmatter(content) {
  const match = content.match(/^---\r?\n([\s\S]*?)\r?\n---\r?\n([\s\S]*)$/);
  if (!match) return { frontmatter: null, body: content };

  const raw  = match[1];
  const body = match[2];
  const fm   = {};

  const lines = raw.split(/\r?\n/);
  let i = 0;
  while (i < lines.length) {
    const line = lines[i];

    // Multiline value (>- or |)
    const multilineMatch = line.match(/^(\S[\w-]*):\s*[>|]-?\s*$/);
    if (multilineMatch) {
      const key = multilineMatch[1];
      const parts = [];
      i++;
      while (i < lines.length && /^\s+/.test(lines[i])) {
        parts.push(lines[i].trim());
        i++;
      }
      fm[key] = parts.join(' ');
      continue;
    }

    // Simple key: value
    const kvMatch = line.match(/^(\S[\w-]*):\s*(.*)/);
    if (kvMatch) {
      const key = kvMatch[1];
      const val = kvMatch[2].trim();
      if      (val === 'true')  fm[key] = true;
      else if (val === 'false') fm[key] = false;
      else if (val.startsWith('[') && val.endsWith(']')) {
        fm[key] = val.slice(1, -1).split(',').map(s => s.trim()).filter(Boolean);
      }
      else if (val === '')      fm[key] = null;
      else                      fm[key] = val;
    }
    i++;
  }

  return { frontmatter: fm, body };
}

// ── Skill discovery ───────────────────────────────────────────────────────────