eleventy-plugin-reading-time/lib/reading-time.js

Add the reading time for a text as template tag.

module.exports = function readingTime(
  postOrContent,
  { printSeconds = false, raw = false, speed = 300 } = {}
) {
  const htmlContent =
    typeof postOrContent === 'string'
      ? postOrContent
      : postOrContent.templateContent;

  if (!htmlContent) {
    return `0 ${printSeconds ? 'seconds' : 'minutes'}`;
  }

  const content = htmlContent.replace(/(<([^>]+)>)/gi, '');
  const matches = content.match(/[\u0400-\u04FF]+|\S+\s*/g);
  const count = matches !== null ? matches.length : 0;

  let est = '';

  if (printSeconds === true) {
    const min = Math.floor(count / speed);
    const sec = Math.floor((count % speed) / (speed / 60));

    if (raw === false) {
      const mins = min + ' minute' + (min === 1 ? '' : 's') + ', ';
      const secs = sec + ' second' + (sec === 1 ? '' : 's');
      est = min > 0 ? mins + secs : secs;
    } else {
      est = min * 60 + sec;
    }
  } else {
    const min = Math.ceil(count / speed);

    if (raw === false) {
      est = min + ' min';
    } else {
      est = min;
    }
  }

  return est;
};