xrforge/manyfold/root/hook.d/experience_updated/300-package_mml.rb

#!/usr/bin/env ruby

require 'json'
require_relative './../../xrforge.rb'

# Check if a filename is provided
if ARGV.length != 1
  puts "Usage: #{$0} <path/to/experience/somefile.xxx>"
  exit 1
end

filename = ARGV[0]

begin

  # Change the directory
  dir = File.dirname(filename)
  Dir.chdir( File.dirname(filename) )
  # Read and parse the JSON file
  data = JSON.parse( File.read( "datapackage.json" ) )

  #if data['keywords'].empty? || data['keywords'].include?('mml')

  logfile = File.join( File.dirname(filename), ".xrforge/log.txt" )

  XRForge.log("✅ starting build mml XR scene", logfile)

  # Extract the desired field (assuming the field is named 'model_file')
  thumb_file = data['image']

  XRForge.log("✅ thumbnail sidecar-file '#{thumb_file}' detected", logfile)
  
  # Get the base name of the thumbnail file without its extension
  base_name = File.basename(thumb_file, File.extname(thumb_file))
  
  model_file = nil # Initialize model_file to nil
  
  # Loop over the list of extensions
  XRForge::MODEL_EXT.each do |ext|
    # Construct the filename with the current extension
    filename = "#{base_name}#{ext}"
  
    # Check if the file exists
    if File.exist?(filename)
      XRForge.log("✅ 3D file '#{filename}' detected", logfile)
      model_file = "#{dir.gsub("/mnt/","")}/#{filename}" # Store the found filename
      break # Stop the loop once a file is found
    else
      # Log a message for the file that was not found, but don't stop
      XRForge.log("⚠️ 3D file '#{filename}' not detected", logfile)
    end
  end
  
  # Check if a model file was found after the loop
  if model_file
    XRForge.log("✅ Final model file: '#{model_file}'", logfile)
  else
    XRForge.log("❌ No suitable 3D file found for XR Fragments- / MML-compatible experience", logfile)
  end

  # Get the value of the environment variable FEDERATE_DRIVE_HOST
  federate_drive_host = ENV['FEDERATE_DRIVE_HOST']

  # https://viewer.mml.io/main/v1/?url=https%3A%2F%2Ffoo.org%2Fbar.mml
  mml = <<~MML
    <m-model src="#{federate_drive_host}/#{model_file.gsub("#","%23")}" anim-loop="true" anim-enabled="true"></m-model>
  MML

  File.write('.xrforge/scene.mml', mml)

  XRForge.log("✅ generated scene.mml", logfile)
  XRForge.log(" ", logfile)

  # tag it!
  if ! data['keywords'].include?('mml')
    data['keywords'].push('mml')
    File.write("datapackage.json", JSON.pretty_generate(data) )
  end

rescue Errno::ENOENT
  puts "File #{filename} not found"
rescue JSON::ParserError
  puts "Error parsing JSON from #{filename}"
rescue => e
  puts "An error occurred: #{e.message}"
end