lightroom-groups.rb

#!/usr/bin/env ruby
#
# lightroom-groups.rb
# Author: Rob Miller <r@robm.me.uk>
#
# Mass organises presets into groups in Lightroom, based on their folder
# on disk.
#
# --
#
# Lightroom is a pain in the arse when it comes to managing presets. It
# would be nice if you could just sort them into folders and have
# Lightroom respect that structure, but no – the folder is stored in the
# XMP metadata for the preset itself, and the interface for managing the
# folders is awful – you have to right click, "Move", select the folder,
# click OK, etc. for each and every preset. No thanks.
#
# This script takes the structure of the folders on disk, and sets the
# metadata of the presets accordingly. So put the presets into the right
# folders – from "User Presets" to whatever else you want – and then,
# once you're happy with it on disk, run this script. It'll blitz
# through and update the group of the preset to reflect the name of the
# folder it's in. Simple.
#
# --
#
# I DO NOT ACCEPT RESPONSIBILITY IF THIS SCREWS UP YOUR PRESETS IN ANY
# WAY, IT WORKED FOR ME BUT IT MIGHT NOT WORK FOR YOU

gem "nokogiri", "~> 1.10"
require "nokogiri"

folders = Dir["*"].find_all { |f| Dir.exist?(f) && f != "User Presets" }

folders.each do |folder|
  Dir["#{folder}/*.xmp"].each do |file|
    xml = Nokogiri::XML(File.read(file))
    group_name = xml.at_xpath("//crs:Group/rdf:Alt/rdf:li",
                             "x" => "adobe:ns:meta/",
                             "rdf" => "http://www.w3.org/1999/02/22-rdf-syntax-ns#",
                             "crs" => "http://ns.adobe.com/camera-raw-settings/1.0/")

    unless group_name
      $stderr.puts "Couldn't find a group name for #{file}"
      next
    end

    group_name.content = folder

    File.open(file, "w") do |write|
      puts "Writing XML to #{file}"
      write.write(xml.to_s)
    end
  end
end