string-as-duration.rb

# encoding: utf-8
#
#        DO WHAT THE FUCK YOU WANT TO PUBLIC LICENSE 
#                    Version 2, December 2004 
#
# Copyright (C) 2004 Ryan Biesemeyer <wtf@yaauie.com> 
#
# Everyone is permitted to copy and distribute verbatim or modified 
# copies of this license document, and changing it is allowed as long 
# as the name is changed. 
#
#            DO WHAT THE FUCK YOU WANT TO PUBLIC LICENSE 
#   TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION 
#
#  0. You just DO WHAT THE FUCK YOU WANT TO.
#

require 'active_support/core_ext/numeric/time.rb'

# DISCLAIMER: Don't use this. Just don't.
module String::AsDuration
  # Takes something like "36 hours, 5 minutes" and makes an ActiveSupport::Duration
  # @param [String] "36 hours, 5 minutes"
  # @return [ActiveSupport::Duration]
  def self.extract(string)
    clean_string = string.gsub(/(,|and)/, '')
    durations = clean_string.split(' ').each_slice(2).map do |i,p|
      unless i =~ /\A[\d]+\z/
        warn("NOT A NUMBER: #{i.dump}")
        return nil
      end
      unless p =~ /\A(seconds?|minutes?|hours?|days?|weeks?|fortnights?)\z/i
        warn("NOT A TIME PERIOD: #{p.dump}")
        return nil
      end
      (i.to_i).send(p.downcase)
    end
    durations.reduce(:+)
  rescue => e
    warn("CAUGHT: #{e} parsing #{string.dump}")
    nil
  end

  # Don't do this. Seriously don't.
  def self.install_globally!
    class ::String
      # If self is something like "36 hours, 5 minutes", returns an ActiveSupport::Duration
      # @return [ActiveSupport::Duration]
      def as_duration
        String::AsDuration.extract(string)
      end
    end
    warn("Some dumbass didn't heed the warnings (at #{caller.first})")
  end
end