Convert a sequence of hourly tasks and a regular work week into due dates.

tallytasks.rb

#!/usr/bin/env ruby
require 'date'

class Date
    def workday?
        return !(self.saturday? or self.sunday?)
    end
end

def tally_tasks(hrs_per_day, start_date=nil)
  hrs_total = 0.0
  hrs_used_today = 0.0
  date = start_date || Date.today
  while true
    print "\nTask Hours> "
    taskhrs = gets.strip.to_f

    hrs_total += taskhrs
    hrs_used_today += taskhrs
    while hrs_used_today > hrs_per_day
        date += 1
        hrs_used_today -= hrs_per_day if date.workday?
    end
    print "%s (%0.1fhr remain in day)\tTotal %0.1fhrs" % [date.to_s, hrs_per_day - hrs_used_today, hrs_total]
  end
end

if __FILE__==$0
  if ARGV.length < 1
    abort "Usage: #{__FILE__} hours_allotted_per_day [starting_date]"
  end
  hrs_per_day = ARGV.shift.to_f
  if ARGV.any?
    start_date = Date.parse(ARGV.shift)
  end

  tally_tasks(hrs_per_day, start_date)
end