Report unused images.

  # Looks up images from directories specified through --images option.

  class Images

    def initialize(paths)

      @paths = paths

      @paths = scan_for_images(paths)

      @images = {}

    end

    # Scans each path for image files, building a hash of paths where

    # each path points to a hash of image files found in that path.

    def scan_for_images(paths)

      map = {}

      paths.each do |path|

        # Scans directory for image files

        map[path] = {}

        Dir[path+"/**/*.{png,jpg,jpeg,gif}"].each do |img|

          map[path][img] = false

        end

      end

      map

    end

    # Adds relative image path of an image

    def add(filename)

      unless @images[filename]

          Logger.instance.warn("Image #{img} not found")

        end

      end

      report_unused

    end

    # Attempts to copy one image, returns true on success

    def copy_img(img, output_dir)

      @paths.each do |path|

      @paths.each_pair do |path, map|

        filename = path + "/" + img

        if File.exists?(filename)

        if map.has_key?(filename)

          dest = output_dir + "/" + img

          FileUtils.makedirs(File.dirname(dest))

          FileUtils.cp(filename, dest)

          Logger.instance.log("Copy #{filename} to #{dest} ...")

          # mark file as used.

          map[filename] = true

          return true

        end

      end

      return false

    end

    # Report unused images

    def report_unused

      @paths.each_pair do |path, map|

        map.each_pair do |img, used|

          Logger.instance.warn("Image #{img} not used") unless used

        end

      end

    end

  end

end