Prepend exif date to file name

prepend-exif-date.rb

#!/usr/bin/env ruby

# Place this script in a folder full of images.
# After execution, it will rename all image files,
# prepending the date of shot taken to the
# original file name.

# https://github.com/tonytonyjan/exif
# gem install exif

require 'exif'

all_files = Dir.entries('.')

jpgs = all_files.select { |file_name| file_name =~ /\.jpg$/ }


jpgs.each do |file_name|
  data = Exif::Data.new(File.open(file_name))

  date = data
    .date_time_original
    .to_s
    .gsub(/:/, '-')
    .gsub(/\s/, '--')

  new_name = "#{date}--#{file_name}"

  File.rename(file_name, new_name)

  puts "#{file_name} renamed to #{new_name}"
end