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python_flake8.rb

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# frozen_string_literal: true

module Overcommit::Hook::PreCommit

# Runs `flake8` against any modified Python files.

#

# @see https://pypi.python.org/pypi/flake8

class PythonFlake8 < Base

MESSAGE_REGEX = /^(?<file>(?:\w:)?.+):(?<line>\d+):\d+:\s(?<type>\w\d+)/.freeze

# Classify 'Exxx' and 'Fxxx' message codes as errors,

# everything else as warnings.

# http://flake8.readthedocs.org/en/latest/warnings.html

MESSAGE_TYPE_CATEGORIZER = lambda do |type|

'EF'.include?(type[0]) ? :error : :warning

end

def run

result = execute(command, args: applicable_files)

return :pass if result.success?

output = result.stdout.chomp

# example message:

# path/to/file.py:2:13: F812 list comprehension redefines name from line 1

extract_messages(

output.split("\n").grep(MESSAGE_REGEX),

MESSAGE_REGEX,

MESSAGE_TYPE_CATEGORIZER

)

end

end

end