Parse YAML front matter

parseYAMLFrontMatter.js

/**
 * @param {string} src Markdown source.
 * @param {string} [delimiter='---'] Front matter delimiter. --- by default.
 * @returns {{meta: Object, body: string}}
 */
function parseYAMLFrontMatter(src, delimiter) {
  var delimiter = delimiter || '---';
  var meta = null;
  var body = src;

  if (src.indexOf(delimiter) === 0) {
    // Identify end of YAML front matter
    var end = src.indexOf(delimiter, delimiter.length);

    if (end !== -1) {
      meta = src.substring(delimiter.length, end).trim();
      body = src.substring(end + delimiter.length).trim();
    }
  }

  return {
    meta: meta,
    body: body
  }
}