Remove unused images from a Rails app

prune.rb

class Pruner

  def initialize(root)
    @skip = [
      '.', '..',  # System files
      '.DS_Store', # Mac files
      'determiners' # Directories that are programatic
    ]
    @root = root
  end

  def prune(directory = "")
    p "Pruning #{directory}"

    full_directory = "#{@root}#{directory}"
    Dir.new(full_directory).each do |filename|
      next if @skip.include?(filename)

      filepath = "#{@root}#{directory}#{filename}"
      if File.directory?(filepath)
        prune("#{directory}#{filename}/")
        next
      end
      #p "File: #{filename}"
      cmd = "git grep '#{directory}#{filename}' | wc -l"
      #p cmd
      count = `#{cmd}`.strip.to_i
      if count == 0
        p "- #{directory}#{filename}"
        File.delete(filepath)
      else
        p "+ #{directory}#{filename}"
      end
    end
  end
end
root = "/Users/iHiD/Projects/meducation/website/app/assets/images/"
Pruner.new(root).prune