Simple benchmarker

simple_benchmark.rb

def simple_benchmarker
  benchmarks = []
  activity = ->(name) { benchmarks << [name, Time.now] }
  activity[:started]
  yield activity
  activity[:finished]
  display_benchmarks benchmarks
rescue Exception => e
  activity[:error_occurred]
  display_benchmarks benchmarks
  raise e
end

def display_benchmarks(benchmarks)
  first_time, previous_time = nil, nil
  benchmarks.each do |act, time|
    first_time ||= time
    previous_time ||= time
    puts "%20s  \t+%4f seconds  \t (+%4f seconds total)  \t%s" % [ act.to_s[0..20], time - previous_time, time - first_time, time]
    previous_time = time
  end
end



# Usage example
# this line is just so that you can paste the whole file into IRB and it will Just Work(tm)
def make_the_tea ; sleep 3 ; end ; def take_out_the_rubbish ; sleep 3 ; end ; def do_the_dishes ; sleep 3 ; end ; def watch_tv ; sleep 3 ; end

simple_benchmarker do |activity|
  make_the_tea
  activity[:finished_making_tea]
  take_out_the_rubbish
  do_the_dishes
  activity[:done_boring_chores]
  watch_tv
end