text: import glob
  import subprocess
  import sys
  import os
  
  results = open('mixed-programs/results.csv', 'w+')
  
  counter = 0
  for fn in glob.glob('mixed-programs/*.clvm'):
  
      print('%04d: %s' % (counter, fn))
      counter += 1
      # the filename is expected to be in the form:
      # name "-" value_size "-" num_calls
      env = open(fn[:-4] + 'env').read()
      output = subprocess.check_output(['brun', '--backend=rust', '-c', '--quiet', '--time', fn, env])
      output = output.decode('ascii').split('\n', 5)[:-1]
  
      counters = {}
      for o in output:
          if ':' in o:
              key, value = o.split(':')
              counters[key.strip()] = value.strip()
          elif '=' in o:
              key, value = o.split('=')
              counters[key.strip()] = value.strip()
  
      line = counters['cost'] + ',' + counters['run_program'] + '\n'
      results.write(line)
  
  gnuplot_filename = 'mixed-programs/render.gnuplot'
  gnuplot = open(gnuplot_filename, 'w+')
  
  gnuplot.write('''set output "mixed-programs/costs.png"
  set datafile separator ","
  set term png size 1400,900 small
  set termoption enhanced
  set ylabel "run-time (s)"
  set xlabel "cost"
  set xrange [0:*]
  set yrange [0:*]
  plot "mixed-programs/results.csv" using 1:2 with points
  ''')
  
  results.close()
  gnuplot.close()
  os.system('gnuplot %s' % gnuplot_filename)
  