new_contents: import sys
  import re
  
  with open(sys.argv[1]) as f:
      magic = f.readline().strip()
      if magic != "P1":
          print "Expected file to start with P1"
          sys.exit(1)
  
      f.readline() # Ignore comment line
      w, h = [int(n) for n in f.readline().strip().split(" ")]
      pixels = re.sub(r"[^01]", "", f.read())
      lines = [pixels[i:i+w] for i in xrange(0, len(pixels), w)]
  
  if len(lines) > 64:
      print "Max 64 lines"
      sys.exit(1)
  
  lines.extend(["0"*w] * (64 % len(lines))) # Pad out to 64 lines
  cols = w
  if cols > 128:
      print "Max 128 columns"
      sys.exit(1)
  
  for i in range(cols):
      for byteoff in range(8):
          bits = []
          for bitoff in range(8):
              row = lines[byteoff * 8 + bitoff]
              bits.append(row[i])
          print "write_data", " ".join(reversed(bits))
      print ""
  
subject: Add script to generate script from pbm files