28degrees.rb

# Gives an accurate balance for 28degrees credit card including pending transactions.
# Copy pasta the transactions from the 28degrees website into a plain text
# file and then feed it into this script.
#
# $> ruby 28degrees.rb some-text-file.txt
#
if $0 == __FILE__
  unless ARGV[0]
    puts "Usage: #{__FILE__} filename"
    exit 1
  end

  lines = File.readlines(ARGV[0])
  monies = lines.select { |l| /\$/.match(l) }
  total = monies.reduce(0) { |t, m| t += m.gsub(/\$/, "").to_f; t }
  puts total
end