follmann/favicon_maker

module FaviconMaker
  module BaseCommand

    def compose(template_file_path, output_file_path, convert_settings, options, format, &block)
      ico_cmd =   [ "convert -background none #{options}".strip ]
      ico_cmd +=  [ "\"#{template_file_path}\" #{options_to_args(convert_settings)}" ]
      ico_cmd +=  yield([]) if block_given?
      ico_cmd +=  [ " #{format}:\"#{output_file_path}\"" ]
      @command = ico_cmd.join(' ')
    end

    def options_to_args(options)
      return nil if options.nil?
      options.map { |k,v|
        if [ :xc, :null ].include?(k)
          "#{k}:#{v}"
        else
          "-#{k} #{v}".strip
        end
      }.join(' ')
    end

    def on_windows?
      (RbConfig::CONFIG['host_os'].match /mswin|mingw|cygwin/)
    end

    def to_s
      @command
    end

  end
end