Script to update folder names of Mac Photos app exports, so that the date comes first.

mac-photos-export-reorganize.rb

#!/usr/bin/env ruby

# When you export files from the Mac Photos app, it can generate a directory structure like this:
# ./
#   ./My Favorite Place - Some City, April 10, 1999
#   ./Some Other City, January 1, 1995
#
# This script renames all those directories to follow this structure:
# ./
#   ./1995-01-01 Some Other City
#   ./1999-04-10 My Favorite Place - Some City
#
# Only English month names are supported.
#
# The script accepts one argument, the path to the base directory.

require 'date'

MONTH_REGEXP = Regexp.new(Date::MONTHNAMES.compact.join('|'))
MOMENT_DIR_REGEXP = /\A((?<location>.*?),\s)?(?<month>#{MONTH_REGEXP})\s(?<day>\d+),\s(?<year>\d+)\z/

if ARGV.length != 1
  puts "Usage: ruby mac-photos-export-reorganize.rb DIR"
  exit 1
end

$dir = File.expand_path(ARGV[0])

if !Dir.exist?($dir)
  puts "Directory #{$dir} does not exist"
  exit 1
end

if !File.directory?($dir)
  puts "#{$dir} is not a directory"
  exit 1
end

Dir["#{$dir}/*"].each do |dir|
  next if !File.directory?(dir)

  basename = File.basename(dir)
  match = MOMENT_DIR_REGEXP.match(basename)
  unless match
    puts "Skipping directory: #{dir}"
    next
  end

  new_basename = "%04d-%02d-%02d %s" % [match[:year], Date::MONTHNAMES.index(match[:month]), match[:day], match[:location]]
  new_name = "#{File.dirname(dir)}/#{new_basename}"
  puts "Renaming #{dir} to #{new_name}"
  File.rename(dir, new_name)
end