utils.ts

// Removes # and connects each word with '-'.
// It also replaces !/? with '-'.
const createLink = (string: string): string => {
  const shapedString = string
    .toLowerCase()
    .replace(/^#+\s/, "")
    .trimRight();
  const anchor = shapedString
    .split(" ")
    .join("-")
    .replace(/[?!]/g, "-");
  return anchor;
};

// It removes # from the given string. And it shortens the string if its longer than "stringLimit".
const createTitle = (string: string, stringLimit: number) => {
  const rawTitle = string.replace(/^#+\s/g, "");

  if (rawTitle.length >= stringLimit)
    return `${rawTitle.slice(0, stringLimit)}..`;

  return rawTitle;
};

// It extracts headings from the given markdownText.
const extractHeadingsFromMd = (
  markdownText: string,
  highestTargetHeadings: number,
  lowestTargetHeadings: number
): RegExpMatchArray | null => {
  const headingRegex = new RegExp(
    `^#{${highestTargetHeadings},${lowestTargetHeadings}}\\s.+(\\n|\\r|\\r\\n)`,
    "gm"
  );
  return markdownText.match(headingRegex);
};

const removeCodeBlockFromMd = (
  markdownText: string
): string => {
  const codeBlockRegex = new RegExp('((````.+?````)|(```.+?```)|(~~~.+?~~~))\n', 'gms');
  return markdownText.replace(codeBlockRegex, '');
};

export { createLink, createTitle, extractHeadingsFromMd, removeCodeBlockFromMd };