Displays the file names of files that are not found in any documents under the given search directories

find_unused_images.rb

#!/usr/bin/env ruby

def unused_images(image_path_dir, search_dirs)
  img_fns = Dir.glob("#{image_path_dir}**/*.*")
  search_dirs.each {|sd| img_fns.delete_if{|img_fn| `grep -r '#{File.basename(img_fn)}' #{sd}` != ""}}
  return img_fns
end

if ARGV.size < 2
  puts "Usage: image_cleanup path_to_images path_to_search ..."
  exit 1
end

image_path = ARGV.shift
unused_images(image_path, ARGV).each do |fn|
  puts fn
end