compile.py

import subprocess
import re

CC = 'gcc'
FILE = 'main.c'
OUTPUT = 'fbcp'

error_re = re.compile(r'main\.c:(\d+):\d+: (?:(?:fatal )?error|warning)')

def comment_line(l):
    with open(FILE) as f:
        old_code = f.readlines()
    
    if not old_code[l - 1].startswith('//'):
        old_code[l - 1] = '// ' + old_code[l - 1]

    with open(FILE, 'w') as f:
        f.write(''.join(old_code))

fixed_error = True
while fixed_error:
    output = subprocess.run([CC, FILE, '-o', OUTPUT], capture_output=True).stderr.decode('utf8')

    fixed_error = False
    for match in error_re.finditer(output):
        comment_line(int(match.group(1)))
        fixed_error = True