PyFlakes Script for BBEdit 12 / python3

BBFlakes3.py

#!/usr/bin/env python3
"""
Fork of the original BBFlakes script to make it run under python3/BBEdit 12.

A quick script to install into your `Application Support/BBEdit/Scripts` folder.
This runs PyFlakes (requires PyFlakes to be installed at `/usr/local/bin` and 
reformats the results so that they show up in BBEdit's search results / error / 
warnings window. Then the errors can be stepped through one at a time.
I've bound this to control-shift-V. You must save your Python file first before
running the check.
"""
from __future__ import print_function
import os
import re
import sys
from subprocess import Popen, PIPE

if os.environ['BB_DOC_LANGUAGE'].lower() != 'python':
    # Bail out quietly if language isn't Python
    sys.exit(0)

doc_file = os.environ['BB_DOC_PATH']
pyflakes = "/usr/local/bin/pyflakes"

stdout, stderr = Popen([pyflakes, doc_file], stdout=PIPE, stderr=PIPE).communicate()
output = stdout if stdout else stderr

if not output:
    sys.exit(0)

line_format = re.compile('(?P<path>[^:]+):(?P<line>\d+):\s(?P<message>.*$)')
for line in output.splitlines():
    line = line.decode('utf-8')
    m = line_format.match(line)
    if not m:
        continue
    groups = m.groupdict()
    print('''File "{path}", line {line}'''.format(**groups), file=sys.stderr)
    print(groups['message'], file=sys.stderr)

sys.exit(1)