Flake8 Script for BBEdit 10

BBFlakes.py

#!/usr/bin/env python
"""
A quick script to install into your `Application Support/BBEdit/Scripts` folder.
This runs flake8 (requires flake8 to be installed at `/usr/local/bin` -
try ``pip install flake8``) 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-l. You must save your Python file first before
running the check.

original script: https://gist.github.com/1157742

Ported to work with:
- flake8 --version: 1.4 (pyflakes: 0.5.0, pep8: 1.2)
- python --version: Python 2.7.2
BBEdit 10.1.2 (MAS)
Here: https://gist.github.com/3317713
"""
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/flake8"
line_length = 256 # I don't like PEP8 warning be about long lines.

stdout, stderr = Popen([pyflakes, doc_file, "--max-line-length=" + str(line_length)], 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+):(?P<character>\d+:)?\s(?P<message>.*$)')
for line in output.splitlines():
    m = line_format.match(line)
    if not m:
        continue
    groups = m.groupdict()
    print('''  File "{path}", line {line}'''.format(**groups), file=sys.stderr)
    outstr = ""
    if groups['character']:
        outstr = "At column " + groups['character'] + " "
    print(outstr + groups['message'], file=sys.stderr)
    print('^', file=sys.stderr)
sys.exit(1)

also, I do not see an effect of printing the caret and there is no apparent way to do this: <Then
the errors can be stepped through one at a time.>
I mean that the output is plain text with no link to the code page as in a BBedit search result or file compare