Ruby Command Line Parsing

require "optiflag"
require "log"

module Options extend OptiFlagSet
  optional_switch_flag "debug"
  optional_flag "date"
  usage_flag "help"

  and_process!
end

if Options.flags.debug?
  Log.on
  Log.log "debug mode on"
end

if Options.flags.date != nil
  puts "-date #{Options.flags.date}"
end

Here is the official documentation with an example.