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"""Formatting and file mangling support."""
import functools
import multiprocessing
import os
import re
import signal
import traceback
from datetime import datetime
from snakeoil.cli.exceptions import UserException
from snakeoil.mappings import OrderedSet
copyright_regex = re.compile(
r"^# Copyright (?P<date>(?P<begin>\d{4}-)?(?P<end>\d{4})) (?P<holder>.+)$"
)
keywords_regex = re.compile(
r'^(?P<pre>[^#]*\bKEYWORDS=(?P<quote>[\'"]?))(?P<keywords>.*)(?P<post>(?P=quote).*)$'
)
def mangle(name: str):
"""Decorator to register file mangling methods."""
class decorator:
"""Decorator with access to the class of a decorated function."""
def __init__(self, func):
self.func = func
def __set_name__(self, owner, name):
owner._mangle_funcs[name] = self.func
setattr(owner, name, self.func)
return decorator
class Mangler:
"""File-mangling iterator using path-based parallelism."""
# mapping of mangling types to functions
_mangle_funcs = {}
def __init__(self, changes, skip_regex=None):
self.jobs = os.cpu_count()
if skip_regex is not None:
changes = (c for c in changes if not skip_regex.match(c.full_path))
self.changes = OrderedSet(changes)
# setup for parallelizing the mangling procedure across files
self._mp_ctx = multiprocessing.get_context("fork")
self._mangled_paths_q = self._mp_ctx.SimpleQueue()
self._current_year = str(datetime.today().year)
# initialize settings used by iterator support
self._runner = self._mp_ctx.Process(target=self._run)
signal.signal(signal.SIGINT, self._kill_pipe)
self._mangled_paths = iter(self._mangled_paths_q.get, None)
# construct composed mangling function
self.composed_func = functools.reduce(
lambda f, g: lambda x: f(g(self, x)), self._mangle_funcs.values(), lambda x: x
)
@mangle("EOF")
def _eof(self, change):
"""Drop EOF whitespace and forcibly add EOF newline."""
return change.update(change.data.rstrip() + "\n")
@mangle("keywords")
def _keywords(self, change):
"""Fix keywords order."""
def keywords_sort_key(kw):
return tuple(reversed(kw.lstrip("-~").partition("-")))
lines = change.data.splitlines()
for i, line in enumerate(lines):
if mo := keywords_regex.match(line):
kw = sorted(mo.group("keywords").split(), key=keywords_sort_key)
new_kw = " ".join(kw)
if not mo.group("quote"):
new_kw = f'"{new_kw}"'
lines[i] = f'{mo.group("pre")}{new_kw}{mo.group("post")}'
break
return change.update("\n".join(lines) + "\n")
def _kill_pipe(self, *args, error=None):
"""Handle terminating the mangling process group."""
if self._runner.is_alive():
os.killpg(self._runner.pid, signal.SIGKILL)
if error is not None:
# propagate exception raised during parallelized mangling
raise UserException(error)
raise KeyboardInterrupt
def __iter__(self):
# start running the mangling processes
self._runner.start()
return self
def __next__(self):
try:
path = next(self._mangled_paths)
except StopIteration:
self._runner.join()
raise
# Catch propagated, serialized exceptions, output their
# traceback, and signal the scanning process to end.
if isinstance(path, list):
self._kill_pipe(error=path[0])
return path
def _mangle(self, change):
"""Run composed mangling function across a given change."""
if orig_data := change.read():
change = self.composed_func(change)
if change.data != orig_data:
change.sync()
return change
def _run_manglers(self, paths_q):
"""Consumer that runs mangling functions, queuing mangled paths for output."""
try:
for change in iter(paths_q.get, None):
if mangled_change := self._mangle(change):
self._mangled_paths_q.put(mangled_change.path)
except Exception: # pragma: no cover
# traceback can't be pickled so serialize it
tb = traceback.format_exc()
self._mangled_paths_q.put([tb])
def _run(self):
signal.signal(signal.SIGINT, signal.SIG_DFL)
os.setpgrp()
paths_q = self._mp_ctx.SimpleQueue()
pool = self._mp_ctx.Pool(self.jobs, self._run_manglers, (paths_q,))
pool.close()
# queue paths for processing
for change in self.changes:
paths_q.put(change)
# notify consumers that no more work exists
for i in range(self.jobs):
paths_q.put(None)
pool.join()
# notify iterator that no more results exist
self._mangled_paths_q.put(None)
class GentooMangler(Mangler):
"""Gentoo repo specific file mangler."""
_mangle_funcs = Mangler._mangle_funcs.copy()
@mangle("copyright")
def _copyright(self, change):
"""Fix copyright headers and dates."""
lines = change.data.splitlines()
if mo := copyright_regex.match(lines[0]):
groups = mo.groupdict()
if groups["begin"] is None and groups["date"] != self._current_year:
# use old copyright date as the start of date range
date_range = f"{groups['date']}-{self._current_year}"
lines[0] = re.sub(groups["date"], date_range, lines[0])
else:
lines[0] = re.sub(mo.group("end"), self._current_year, lines[0])
lines[0] = re.sub("Gentoo Foundation", "Gentoo Authors", lines[0])
return change.update("\n".join(lines) + "\n")
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