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"""

Diff based code style checker with flake8

This code come from:

https://github.com/scipy/scipy/blob/main/tools/lint_diff.py

Scipy's licence: https://github.com/scipy/scipy/blob/main/LICENSE.txt

Copyright (c) 2001-2002 Enthought, Inc. 2003-2022, SciPy Developers.

All rights reserved.

Redistribution and use in source and binary forms, with or without

modification, are permitted provided that the following conditions

are met:

1. Redistributions of source code must retain the above copyright

notice, this list of conditions and the following disclaimer.

2. Redistributions in binary form must reproduce the above

copyright notice, this list of conditions and the following

disclaimer in the documentation and/or other materials provided

with the distribution.

3. Neither the name of the copyright holder nor the names of its

contributors may be used to endorse or promote products derived

from this software without specific prior written permission.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS

"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT

LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR

A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT

OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,

SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT

LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,

DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY

THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT

(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE

OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

"""

import conftest

import subprocess

def rev_list(branch, num_commits):

"""List commits in reverse chronological order.

Only the first `num_commits` are shown.

"""

res = subprocess.run(

[

'git',

'rev-list',

'--max-count',

f'{num_commits}',

'--first-parent',

branch

],

stdout=subprocess.PIPE,

encoding='utf-8',

)

res.check_returncode()

return res.stdout.rstrip('\n').split('\n')

def find_branch_point(branch):

"""Find when the current branch split off from the given branch.

It is based off of this Stackoverflow post:

https://stackoverflow.com/questions/1527234/finding-a-branch-point-with-git#4991675

"""

branch_commits = rev_list('HEAD', 1000)

main_commits = set(rev_list(branch, 1000))

for branch_commit in branch_commits:

if branch_commit in main_commits:

return branch_commit

# If a branch split off over 1000 commits ago we will fail to find

# the ancestor.

raise RuntimeError(

'Failed to find a common ancestor in the last 1000 commits')

def find_diff(sha):

"""Find the diff since the given sha."""

files = ['*.py']

res = subprocess.run(

['git', 'diff', '--unified=0', sha, '--'] + files,

stdout=subprocess.PIPE,

encoding='utf-8'

)

res.check_returncode()

return res.stdout

def run_flake8(diff):

"""Run flake8 on the given diff."""

res = subprocess.run(

['flake8', '--diff', '--ignore',

'E402' # top level import for sys.path.append

],

input=diff,

stdout=subprocess.PIPE,

encoding='utf-8',

)

return res.returncode, res.stdout

def test():

branch_commit = find_branch_point("origin/master")

diff = find_diff(branch_commit)

rc, errors = run_flake8(diff)

if errors:

print(errors)

else:

print("No lint errors found.")

assert rc == 0

if __name__ == '__main__':

conftest.run_this_test(__file__)