This script fetches the audio file length in bytes for each audio file of ZOFE podcast

zofe-audio-file-lengths.rb

require 'yaml'

Dir.glob("./_posts/*.md").each do |post_file_path|
  post = YAML.load_file(post_file_path)
  audio_url = post.fetch("audio")

  # NOTE: cURL may return multiple lines with length because
  #   it follows the redirects of the server.
  #
  lengths = `curl -I -L #{audio_url} | grep "Content-Length"`

  max_length =
    lengths
    .split("\n")
    .map { |content_length_str| content_length_str.split("\s").last.to_i }
    .max

  file_content = File.read(post_file_path)

  file_content.gsub!(/(audio\:.*\n)/) do |audio_str_with_url|
    "#{audio_str_with_url}audio_file_length: #{max_length}\n"
  end

  File.write(post_file_path, file_content)
end