1 #!/usr/bin/env ruby
     2 
     3 total = 0
     4 
     5 File.readlines('devlog.txt').each do |line|
     6   if m = line.match(/(\d+) min/)
     7     total += m[1].to_i
     8   end
     9 end
    10 
    11 h = (total/60.0).round(1)
    12 
    13 puts "I've been at this for #{total} minutes (about #{h} hours)."