Hacky rename of Intro to Graduate Algorithms videos to get sorted correctly on Kindle Fire

rename_ga.rb

leading_digit_regex = /\d+\s+/
path = '/Users/tcdowney/Downloads/ga-vids'

Dir.glob("#{path}/*.mp4") do |mp4_file|
  filename = File.basename(mp4_file, File.extname(mp4_file))
  leading_digits = filename.match(leading_digit_regex)[0].to_i
  padded_digits = sprintf('%03d', leading_digits)
  padded_filename = filename.gsub(leading_digits.to_s, padded_digits)
  #puts padded_filename + File.extname(mp4_file)
  File.rename(mp4_file, padded_filename + File.extname(mp4_file))
end