work_work_work.rb

#!/usr/bin/env ruby
# A script to show number of workdays and work hours in a month, named in honor of the Warcraft Peon unit

require 'date'
require "optparse"

options = { hours: 8 }
OptionParser.new do |opts|
  opts.banner = "Usage: #{$0} [options]"

  opts.on("-w", "--hours N", Integer, "Hours per workday") do |h|
    options[:hours] = h
  end

  opts.on_tail("-h", "--help", "Show this message") do
     puts opts
     exit
  end

end.parse!

num_days = lambda { |time| Date.civil(time.year, time.month, -1).mday }

this_month = Time.now.month
this_year = Time.now.year

months = Hash.new

hours = options[:hours]

(this_month..12).to_a.each do |month|
  time = Date.civil(this_year, month)
  days = num_days.call(time)
  months[month] = []
  (1..days).to_a.each do |day|
    ts = Date.civil(this_year, month, day)
    if ! ts.saturday? and ! ts.sunday?
      months[month].push hours
    end
  end
end

months.each_pair do |month, work|
  hours = work.inject { |sum, h| sum + h }
  days = work.count
  date = Date.civil(this_year, month).strftime("%Y-%m")
  puts "#{date}\t\thours: #{hours}, days: #{days}"
end