billing.rb

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

re_line1 = /^\[b([\d,]+)h\](.*)/
re_line2 = /^scheduled (.*)/

total_hours = 0.0

STDIN.each_slice(3) { |entry| # iterate per 3 lines
  hours_and_description, schedule = entry[0], entry[1]

  hours_and_description =~ re_line1
  hours, title = $1, $2

  total_hours += hours.gsub(",", ".").to_f

  schedule =~ re_line2
  date = Date.parse($1)
  
  puts "#{date.strftime('%d-%m-%y')}\t#{hours.ljust(4)}\t#{title}"
}

puts "\nTotaal: #{total_hours}"

input.txt

[b4h] WORK @ Sample project
scheduled 24 Oct 2012 from 08:00 to 12:00
 
[b3,5h] Sample project
scheduled 5 Nov 2012 from 08:30 to 12:00

[b3,75h] Sample project
scheduled 5 Nov 2012 from 08:30 to 12:00

output.txt

24-10-12  4   	 WORK @ Sample project
05-11-12	3,5 	 Sample project
05-11-12	3,75	 Sample project

Totaal: 11.25

Thanks for your input :)

Unfortunately I'm not well versed in Ruby.

As stated in the blogpost I am looking for someone who can write this but also expand on it if I have additional requests (this is why I want it to be a paid project so I don't have to depend on someone's goodwill/free time)

I didn't expect people to start writing code already, I guess it's a small "programmer's challenge" :)