Class: ShiftSubtitleCli

Inherits:
ShiftSubtitle show all
Defined in:
lib/shift_subtitle_cli.rb

Instance Method Summary collapse

Methods inherited from ShiftSubtitle

#shift_srt, #shift_timestamp

Instance Method Details

#execute(arguments) ⇒ Object 



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# File 'lib/shift_subtitle_cli.rb', line 5

def execute(arguments)
  begin
    options = parse_options arguments
    input_file = File.new options[:input_file], 'r'
    output_file = File.new options[:output_file], 'w'
    shift_srt input_file, output_file, time_to_shift(options)
  ensure
    input_file.close unless input_file.nil?
    output_file.close unless output_file.nil?
  end
end

#parse_options(arguments) ⇒ Object 



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# File 'lib/shift_subtitle_cli.rb', line 17

def parse_options(arguments)
  options = {}
  mandatory_options = [ :operation, :seconds, :milliseconds, :input_file, :output_file ]
  parser = OptionParser.new do |opts|
    opts.banner = <<-BANNER.gsub(/^      /,'')
    Shift Subtitle Ruby Challenge
    
    Usage: #{File.basename($0)} --operation [add|sub] --time [seconds,milliseconds] input_file output_file
    
    Options are:
    BANNER
    opts.separator ""

    opts.on("-o", "--operation add|sub", [:add, :sub], "Add or Subtract time") do |operation|
      options[:operation] = operation
    end

    opts.on("-t", "--time seconds,milliseconds", "Seconds AND milliseconds to add or subtract") do |time|
      if (time =~ /\d+,\d+/)
        options[:seconds], options[:milliseconds] = time.split(/,/).map!{ |t| t.to_i }
      else
        raise OptionParser::InvalidArgument, "should be seconds,milliseconds"
      end
    end

    opts.on("-h", "--help", "Show this help message.") { puts opts; exit 0 }

    opts.parse!(arguments)
    options[:input_file], options[:output_file] = arguments[0], arguments[1]

    if mandatory_options.find { |option| options[option].nil? } 
      $stderr.puts opts; exit 1
    end
  end
  options
end

#time_to_shift(options) ⇒ Object

Converts the time and operation into a float (:sub 2,500 returns -2.5)



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# File 'lib/shift_subtitle_cli.rb', line 55

def time_to_shift(options)
  shift_time = options[:seconds].to_i + options[:milliseconds].to_f/1000
  shift_time *= (options[:operation] == :sub)?-1:1
end