function addHeaderID()

in beta/scripts/headingIDHelpers/generateHeadingIDs.js [20:50]

• 27 lines of code
• 7 McCabe index (conditional complexity)

function addHeaderID(line, slugger) {
  // check if we're a header at all
  if (!line.startsWith('#')) {
    return line;
  }

  const match =
    /^(#+\s+)(.+?)(\s*\{(?:\/\*|#)([^\}\*\/]+)(?:\*\/)?\}\s*)?$/.exec(line);
  const before = match[1] + match[2];
  const proc = modules
    .unified()
    .use(modules.remarkParse)
    .use(modules.remarkSlug);
  const tree = proc.runSync(proc.parse(before));
  const head = tree.children[0];
  assert(
    head && head.type === 'heading',
    'expected `' +
      before +
      '` to be a heading, is it using a normal space after `#`?'
  );
  const autoId = head.data.id;
  const existingId = match[4];
  const id = existingId || autoId;
  // Ignore numbers:
  const cleanExisting = existingId
    ? existingId.replace(/-\d+$/, '')
    : undefined;
  const cleanAuto = autoId.replace(/-\d+$/, '');

  if (cleanExisting && cleanExisting !== cleanAuto) {