put image assets into correct folder in asset catalog

update_asset_catalog

#!/usr/bin/env ruby

def usage
  puts "usage: update_asset_catalog path_to_asset_catalog"
  exit(1)
end

def main
  if ARGV.length < 1
    usage
  end

  glob = File.join(ARGV.first, "*.png")
  Dir.glob(glob) do |f|
    basename = File.basename(f)
    rootname = f.gsub(/@(2|3)x/, "")
    destdir = rootname.gsub(".png", ".imageset")
    dest = File.join(destdir, basename)
    if test(?d, destdir)
      puts "#{f} -> #{dest}"
      File.rename(f, dest)
    end
  end

end

main