module.exports = function sha1_file(str_filename) {
  //  discuss at: https://locutus.io/php/sha1_file/
  // original by: Kevin van Zonneveld (https://kvz.io)
  //      note 1: Relies on file_get_contents which does not work in the browser, so Node only.
  //      note 2: Keep in mind that in accordance with PHP, the whole file is buffered and then
  //      note 2: hashed. We'd recommend Node's native crypto modules for faster and more
  //      note 2: efficient hashing
  //   example 1: sha1_file('test/never-change.txt')
  //   returns 1: '0ea65a1f4b4d69712affc58240932f3eb8a2af66'

  const fileGetContents = require('../filesystem/file_get_contents')
  const sha1 = require('../strings/sha1')
  const buf = fileGetContents(str_filename)

  if (buf === false) {
    return false
  }

  return sha1(buf)
}