_includes/shortcodes/pdf-link.js

/**
 * @file Defines a shortcode for linking to PDF copies of pages
 * @author Reuben L. Lillie <reubenlillie@gmail.com>
 */


import {statSync} from 'fs'
import prettyBytes from 'pretty-bytes'

// Filters
import fileExists from '../filters/file-exists.js'
import fileToString from '../filters/file-to-string.js'

/**
 * Defines markup for links to PDF versions of a page
 * @param {string} fileSlug Page file slug from Eleventy’s `data` object
 * @param {sting} dir Directory to search for a PDF
 * @return {string} Relative file path for the PDF
 * @see _Chicago Manual of Style_ 17th ed. 10.49
 */
export default (fileSlug, dir = 'pdf') => {
  var icon = 'img/icons/pdf.svg'
  var path = `${dir}/${fileSlug}.pdf`

  /**
   * Get the file size in bytes
   * @param {string} path File path to check
   * @return {number} Bytes
   */
  function getFileSize(path) {
    var stats = statSync(path)
    var sizeInBytes = stats.size
    return sizeInBytes
  }

  if(fileExists(path)) {
    var size = prettyBytes(getFileSize(path))
    return `<!--_includes/shortcodes/pdf-link-->
<p class="show-on-screen-only text-inline-end">
  <a href="/${path}" data-link-type="pdf">${fileExists(icon) 
    ? `<span class="icon">${fileToString(icon)}</span>` 
    : ''} PDF version</a>
  ${size ? `<span class="small"><code>(${size.toUpperCase()})</code></span>` : ''}
</p>`
  }
  
  return `<!--no pdf found for ${path} by _includes/shortcodes/pdf-link.js-->`
}