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"""Enforce proper usage of __future__ imports."""
from __future__ import annotations
import ast
import sys
def main():
"""Main entry point."""
for path in sys.argv[1:] or sys.stdin.read().splitlines():
with open(path, 'rb') as path_fd:
lines = path_fd.read().splitlines()
missing = True
if not lines:
# Files are allowed to be empty of everything including boilerplate
missing = False
for text in lines:
if text in (b'from __future__ import (absolute_import, division, print_function)',
b'from __future__ import absolute_import, division, print_function'):
missing = False
break
if missing:
with open(path, encoding='utf-8') as file:
contents = file.read()
# noinspection PyBroadException
try:
node = ast.parse(contents)
# files consisting of only assignments have no need for future import boilerplate
# the only exception would be division during assignment, but we'll overlook that for simplicity
# the most likely case is that of a documentation only python file
if all(isinstance(statement, ast.Assign) for statement in node.body):
missing = False
except Exception: # pylint: disable=broad-except
pass # the compile sanity test will report this error
if missing:
print('%s: missing: from __future__ import (absolute_import, division, print_function)' % path)
if __name__ == '__main__':
main()
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