golfer.py

import sys

if len(sys.argv)!=2:
	print 'Usage: golfer.py <file>'
	exit(1)

filename = sys.argv[1]

code = []

with open(filename, 'r') as f:
	for line in f.read().splitlines():
		code.append(line)

instructions = ('XYPBCT'
                '><v^[]{}'
                '0123456789'
                '+-%/*()'
                'ctbw!=')

golfed = ''

for line in code:
	golfed += ''.join(c for c in line.split('#')[0] if c in instructions)

new_name = filename.split('.')[0] + '-golfed.pb'

with open(new_name, 'w') as f:
	f.write(golfed)

print """# [pb](https://esolangs.org/wiki/pb), {} bytes

    {}

~~explanation goes here~~

**Ungolfed:**

""".format(len(golfed), golfed)

for line in code:
	print '    ' + line