From: Jonas Obrist Date: Thu, 19 Apr 2018 00:27:07 +0000 (+0900) Subject: Added caching (#136) X-Git-Url: https://git.madduck.net/etc/vim.git/commitdiff_plain/639b62dcd32cde3645e9f9a633eee33c04d23901?ds=inline Added caching (#136) Black will cache already formatted files using their file size and modification timestamp. The cache is per-user and will always be used unless Black is used with --diff or with code provided via standard input. --- diff --git a/Pipfile b/Pipfile index 4e0d4be..22abd2a 100644 --- a/Pipfile +++ b/Pipfile @@ -7,6 +7,7 @@ name = "pypi" attrs = ">=17.4.0" click = "*" setuptools = ">=38.6.0" +appdirs = "*" [dev-packages] pre-commit = "*" diff --git a/Pipfile.lock b/Pipfile.lock index b6689f7..5882da2 100644 --- a/Pipfile.lock +++ b/Pipfile.lock @@ -1,7 +1,7 @@ { "_meta": { "hash": { - "sha256": "40e1fcca5bf4adcd0e688675714c4b2a771009b6e2005a0f375de1a46a64c906" + "sha256": "b6412a09cc7dd70b0dcd83aa9f1ab659f4c0e2ba413060ab03f7ba4b064bebce" }, "pipfile-spec": 6, "requires": {}, @@ -14,6 +14,14 @@ ] }, "default": { + "appdirs": { + "hashes": [ + "sha256:9e5896d1372858f8dd3344faf4e5014d21849c756c8d5701f78f8a103b372d92", + "sha256:d8b24664561d0d34ddfaec54636d502d7cea6e29c3eaf68f3df6180863e2166e" + ], + "index": "pypi", + "version": "==1.4.3" + }, "attrs": { "hashes": [ "sha256:1c7960ccfd6a005cd9f7ba884e6316b5e430a3f1a6c37c5f87d8b43f83b54ec9", @@ -41,10 +49,10 @@ }, "aspy.yaml": { "hashes": [ - "sha256:6215f44900ff65f27dbd00a36b06a7926276436ed377320cfd4febd69bbd4a94", - "sha256:be70cc0ccd1ee1d30f589f2403792eb2ffa7546470af0a17179541b13d8374df" + "sha256:c959530fab398e2391516bc8d5146489f9273b07d87dd8ba5e8b73406f7cc1fa", + "sha256:da95110d120a9168c9f43601b9cb732f006d8f193ee2c9b402c823026e4a9387" ], - "version": "==1.0.0" + "version": "==1.1.0" }, "attrs": { "hashes": [ @@ -63,17 +71,17 @@ }, "cached-property": { "hashes": [ - "sha256:6e6935ec62567fbcbc346fad84fcea9bc77e3547b7267e62bc5b7ed8e5438ae8", - "sha256:a2fa0f89dd422f7e5dd992a4a3e0ce209d5d1e47a4db28fd0a7b5273ec8da3f0" + "sha256:67acb3ee8234245e8aea3784a492272239d9c4b487eba2fdcce9d75460d34520", + "sha256:bf093e640b7294303c7cc7ba3212f00b7a07d0416c1d923465995c9ef860a139" ], - "version": "==1.4.0" + "version": "==1.4.2" }, "certifi": { "hashes": [ - "sha256:14131608ad2fd56836d33a71ee60fa1c82bc9d2c8d98b7bdbc631fe1b3cd1296", - "sha256:edbc3f203427eef571f79a7692bb160a2b0f7ccaa31953e99bd17e307cf63f7d" + "sha256:13e698f54293db9f89122b0581843a782ad0934a4fe0172d2a980ba77fc61bb7", + "sha256:9fa520c1bacfb634fa7af20a76bcbd3d5fb390481724c597da32c719a7dca4b0" ], - "version": "==2018.1.18" + "version": "==2018.4.16" }, "cfgv": { "hashes": [ @@ -171,10 +179,10 @@ }, "identify": { "hashes": [ - "sha256:53be6ea950a5f40e13be2dd87e67413eb6879527b831333196ab2a54de38f499", - "sha256:c0bfb29634e04cde8e54aee2d55aff9dad30d6ea1f3e9e3ce731934d78635aa1" + "sha256:5cbcc7fca1263bd87fc4dea1abfd7abbbc3807c9b9f09e6f999da6857a0fe35a", + "sha256:a42f6ed9c3ad02b187c8a17027bb9042a54f463d8e617ca208038a25ec69faa7" ], - "version": "==1.0.8" + "version": "==1.0.13" }, "idna": { "hashes": [ @@ -212,11 +220,11 @@ }, "mypy": { "hashes": [ - "sha256:3bd95a1369810f7693366911d85be9f0a0bd994f6cb7162b7a994e5ded90e3d9", - "sha256:7247f9948d7cdaae9408a4ee1662a01853c24e668117b4419acf025b05fbe3ce" + "sha256:04bffef22377b3f56f96da2d032e5d0b2e8a9062a127afc008dc4b0e64cede7a", + "sha256:cdd3ddf96a2cc2e955bcc7b2a16b25e400f132393375b45a2d719c91ac1a8291" ], "index": "pypi", - "version": "==0.580" + "version": "==0.590" }, "nodeenv": { "hashes": [ @@ -248,6 +256,8 @@ }, "pycodestyle": { "hashes": [ + "sha256:1ec08a51c901dfe44921576ed6e4c1f5b7ecbad403f871397feedb5eb8e4fa14", + "sha256:5ff2fbcbab997895ba9ead77e1b38b3ebc2e5c3b8a6194ef918666e4c790a00e", "sha256:682256a5b318149ca0d2a9185d365d8864a768a28db66a84a2ea946bcc426766", "sha256:6c4245ade1edfad79c3446fadfc96b0de2759662dc29d07d80a6f27ad1ca6ba9" ], @@ -281,17 +291,10 @@ }, "pytz": { "hashes": [ - "sha256:07edfc3d4d2705a20a6e99d97f0c4b61c800b8232dc1c04d87e8554f130148dd", - "sha256:3a47ff71597f821cd84a162e71593004286e5be07a340fd462f0d33a760782b5", - "sha256:410bcd1d6409026fbaa65d9ed33bf6dd8b1e94a499e32168acfc7b332e4095c0", - "sha256:5bd55c744e6feaa4d599a6cbd8228b4f8f9ba96de2c38d56f08e534b3c9edf0d", - "sha256:61242a9abc626379574a166dc0e96a66cd7c3b27fc10868003fa210be4bff1c9", - "sha256:887ab5e5b32e4d0c86efddd3d055c1f363cbaa583beb8da5e22d2fa2f64d51ef", - "sha256:ba18e6a243b3625513d85239b3e49055a2f0318466e0b8a92b8fb8ca7ccdf55f", - "sha256:ed6509d9af298b7995d69a440e2822288f2eca1681b8cce37673dbb10091e5fe", - "sha256:f93ddcdd6342f94cea379c73cddb5724e0d6d0a1c91c9bdef364dc0368ba4fda" + "sha256:65ae0c8101309c45772196b21b74c46b2e5d11b6275c45d251b150d5da334555", + "sha256:c06425302f2cf668f1bba7a0a03f3c1d34d4ebeef2c72003da308b3947c7f749" ], - "version": "==2018.3" + "version": "==2018.4" }, "pyyaml": { "hashes": [ @@ -365,10 +368,10 @@ }, "tqdm": { "hashes": [ - "sha256:4f2eb1d14804caf7095500fe11da0e481a47af912e7b57c93f886ac3c40a49dd", - "sha256:91ac47ec2ba6bb92b7ba37706f4dea37019ddd784b22fd279a4b12d93327191d" + "sha256:597e7526c85df881d51e094360181a84533aede1cb3f5a1cada8bbd4de557efd", + "sha256:fe3d218d5b61993d415aa2a9db6dd64c0e4cefb90164ebb197ef3b1d99f531dc" ], - "version": "==4.20.0" + "version": "==4.23.0" }, "twine": { "hashes": [ diff --git a/README.md b/README.md index ffc8b76..ed1e019 100644 --- a/README.md +++ b/README.md @@ -439,6 +439,20 @@ the line length if you really need to. If you're already using Python that is pinned to the latest release on PyPI. If you'd rather run on master, this is also an option. + +## Ignoring non-modified files + +*Black* remembers files it already formatted, unless the `--diff` flag is used or +code is passed via standard input. This information is stored per-user. The exact +location of the file depends on the black version and the system on which black +is run. The file is non-portable. The standard location on common operating systems +is: + +* Windows: `C:\\Users\\AppData\Local\black\black\Cache\\cache.pkl` +* macOS: `/Users//Library/Caches/black//cache.pkl` +* Linux: `/home//.cache/black//cache.pkl` + + ## Testimonials **Dusty Phillips**, [writer](https://smile.amazon.com/s/ref=nb_sb_noss?url=search-alias%3Daps&field-keywords=dusty+phillips): diff --git a/black.py b/black.py index 0323f67..e795fa3 100644 --- a/black.py +++ b/black.py @@ -1,6 +1,7 @@ #!/usr/bin/env python3 import asyncio +import pickle from asyncio.base_events import BaseEventLoop from concurrent.futures import Executor, ProcessPoolExecutor from enum import Enum @@ -32,6 +33,7 @@ from typing import ( Union, ) +from appdirs import user_cache_dir from attr import dataclass, Factory import click @@ -54,6 +56,10 @@ Priority = int Index = int LN = Union[Leaf, Node] SplitFunc = Callable[["Line", bool], Iterator["Line"]] +Timestamp = float +FileSize = int +CacheInfo = Tuple[Timestamp, FileSize] +Cache = Dict[Path, CacheInfo] out = partial(click.secho, bold=True, err=True) err = partial(click.secho, fg="red", err=True) @@ -104,6 +110,12 @@ class WriteBack(Enum): DIFF = 2 +class Changed(Enum): + NO = 0 + CACHED = 1 + YES = 2 + + @click.command() @click.option( "-l", @@ -185,35 +197,70 @@ def main( write_back = WriteBack.YES if len(sources) == 0: ctx.exit(0) + return + elif len(sources) == 1: - p = sources[0] - report = Report(check=check, quiet=quiet) - try: - if not p.is_file() and str(p) == "-": - changed = format_stdin_to_stdout( - line_length=line_length, fast=fast, write_back=write_back - ) - else: - changed = format_file_in_place( - p, line_length=line_length, fast=fast, write_back=write_back - ) - report.done(p, changed) - except Exception as exc: - report.failed(p, str(exc)) - ctx.exit(report.return_code) + return_code = run_single_file_mode( + line_length, check, fast, quiet, write_back, sources[0] + ) else: - loop = asyncio.get_event_loop() - executor = ProcessPoolExecutor(max_workers=os.cpu_count()) - return_code = 1 - try: - return_code = loop.run_until_complete( - schedule_formatting( - sources, line_length, write_back, fast, quiet, loop, executor + return_code = run_multi_file_mode(line_length, fast, quiet, write_back, sources) + ctx.exit(return_code) + + +def run_single_file_mode( + line_length: int, + check: bool, + fast: bool, + quiet: bool, + write_back: WriteBack, + src: Path, +) -> int: + report = Report(check=check, quiet=quiet) + try: + if not src.is_file() and str(src) == "-": + changed = format_stdin_to_stdout( + line_length=line_length, fast=fast, write_back=write_back + ) + else: + changed = Changed.NO + cache: Cache = {} + if write_back != WriteBack.DIFF: + cache = read_cache() + src = src.resolve() + if src in cache and cache[src] == get_cache_info(src): + changed = Changed.CACHED + if changed is not Changed.CACHED: + changed = format_file_in_place( + src, line_length=line_length, fast=fast, write_back=write_back ) + if write_back != WriteBack.DIFF and changed is not Changed.NO: + write_cache(cache, [src]) + report.done(src, changed) + except Exception as exc: + report.failed(src, str(exc)) + return report.return_code + + +def run_multi_file_mode( + line_length: int, + fast: bool, + quiet: bool, + write_back: WriteBack, + sources: List[Path], +) -> int: + loop = asyncio.get_event_loop() + executor = ProcessPoolExecutor(max_workers=os.cpu_count()) + return_code = 1 + try: + return_code = loop.run_until_complete( + schedule_formatting( + sources, line_length, write_back, fast, quiet, loop, executor ) - finally: - shutdown(loop) - ctx.exit(return_code) + ) + finally: + shutdown(loop) + return return_code async def schedule_formatting( @@ -232,41 +279,55 @@ async def schedule_formatting( `line_length`, `write_back`, and `fast` options are passed to :func:`format_file_in_place`. """ - lock = None - if write_back == WriteBack.DIFF: - # For diff output, we need locks to ensure we don't interleave output - # from different processes. - manager = Manager() - lock = manager.Lock() - tasks = { - src: loop.run_in_executor( - executor, format_file_in_place, src, line_length, fast, write_back, lock - ) - for src in sources - } - _task_values = list(tasks.values()) - loop.add_signal_handler(signal.SIGINT, cancel, _task_values) - loop.add_signal_handler(signal.SIGTERM, cancel, _task_values) - await asyncio.wait(tasks.values()) - cancelled = [] report = Report(check=write_back is WriteBack.NO, quiet=quiet) - for src, task in tasks.items(): - if not task.done(): - report.failed(src, "timed out, cancelling") - task.cancel() - cancelled.append(task) - elif task.cancelled(): - cancelled.append(task) - elif task.exception(): - report.failed(src, str(task.exception())) - else: - report.done(src, task.result()) + cache: Cache = {} + if write_back != WriteBack.DIFF: + cache = read_cache() + sources, cached = filter_cached(cache, sources) + for src in cached: + report.done(src, Changed.CACHED) + cancelled = [] + formatted = [] + if sources: + lock = None + if write_back == WriteBack.DIFF: + # For diff output, we need locks to ensure we don't interleave output + # from different processes. + manager = Manager() + lock = manager.Lock() + tasks = { + src: loop.run_in_executor( + executor, format_file_in_place, src, line_length, fast, write_back, lock + ) + for src in sources + } + _task_values = list(tasks.values()) + loop.add_signal_handler(signal.SIGINT, cancel, _task_values) + loop.add_signal_handler(signal.SIGTERM, cancel, _task_values) + await asyncio.wait(_task_values) + for src, task in tasks.items(): + if not task.done(): + report.failed(src, "timed out, cancelling") + task.cancel() + cancelled.append(task) + elif task.cancelled(): + cancelled.append(task) + elif task.exception(): + report.failed(src, str(task.exception())) + else: + formatted.append(src) + report.done(src, task.result()) + if cancelled: await asyncio.gather(*cancelled, loop=loop, return_exceptions=True) elif not quiet: out("All done! ✨ 🍰 ✨") if not quiet: click.echo(str(report)) + + if write_back != WriteBack.DIFF and formatted: + write_cache(cache, formatted) + return report.return_code @@ -276,12 +337,13 @@ def format_file_in_place( fast: bool, write_back: WriteBack = WriteBack.NO, lock: Any = None, # multiprocessing.Manager().Lock() is some crazy proxy -) -> bool: +) -> Changed: """Format file under `src` path. Return True if changed. If `write_back` is True, write reformatted code back to stdout. `line_length` and `fast` options are passed to :func:`format_file_contents`. """ + with tokenize.open(src) as src_buffer: src_contents = src_buffer.read() try: @@ -289,7 +351,7 @@ def format_file_in_place( src_contents, line_length=line_length, fast=fast ) except NothingChanged: - return False + return Changed.NO if write_back == write_back.YES: with open(src, "w", encoding=src_buffer.encoding) as f: @@ -305,12 +367,12 @@ def format_file_in_place( finally: if lock: lock.release() - return True + return Changed.YES def format_stdin_to_stdout( line_length: int, fast: bool, write_back: WriteBack = WriteBack.NO -) -> bool: +) -> Changed: """Format file on stdin. Return True if changed. If `write_back` is True, write reformatted code back to stdout. @@ -320,10 +382,10 @@ def format_stdin_to_stdout( dst = src try: dst = format_file_contents(src, line_length=line_length, fast=fast) - return True + return Changed.YES except NothingChanged: - return False + return Changed.NO finally: if write_back == WriteBack.YES: @@ -2201,16 +2263,20 @@ class Report: same_count: int = 0 failure_count: int = 0 - def done(self, src: Path, changed: bool) -> None: + def done(self, src: Path, changed: Changed) -> None: """Increment the counter for successful reformatting. Write out a message.""" - if changed: + if changed is Changed.YES: reformatted = "would reformat" if self.check else "reformatted" if not self.quiet: out(f"{reformatted} {src}") self.change_count += 1 else: if not self.quiet: - out(f"{src} already well formatted, good job.", bold=False) + if changed is Changed.NO: + msg = f"{src} already well formatted, good job." + else: + msg = f"{src} wasn't modified on disk since last run." + out(msg, bold=False) self.same_count += 1 def failed(self, src: Path, message: str) -> None: @@ -2409,5 +2475,62 @@ def sub_twice(regex: Pattern[str], replacement: str, original: str) -> str: return regex.sub(replacement, regex.sub(replacement, original)) +CACHE_DIR = Path(user_cache_dir("black", version=__version__)) +CACHE_FILE = CACHE_DIR / "cache.pickle" + + +def read_cache() -> Cache: + """Read the cache if it exists and is well formed. + + If it is not well formed, the call to write_cache later should resolve the issue. + """ + if not CACHE_FILE.exists(): + return {} + + with CACHE_FILE.open("rb") as fobj: + try: + cache: Cache = pickle.load(fobj) + except pickle.UnpicklingError: + return {} + + return cache + + +def get_cache_info(path: Path) -> CacheInfo: + """Return the information used to check if a file is already formatted or not.""" + stat = path.stat() + return stat.st_mtime, stat.st_size + + +def filter_cached( + cache: Cache, sources: Iterable[Path] +) -> Tuple[List[Path], List[Path]]: + """Split a list of paths into two. + + The first list contains paths of files that modified on disk or are not in the + cache. The other list contains paths to non-modified files. + """ + todo, done = [], [] + for src in sources: + src = src.resolve() + if cache.get(src) != get_cache_info(src): + todo.append(src) + else: + done.append(src) + return todo, done + + +def write_cache(cache: Cache, sources: List[Path]) -> None: + """Update the cache file.""" + try: + if not CACHE_DIR.exists(): + CACHE_DIR.mkdir(parents=True) + new_cache = {**cache, **{src.resolve(): get_cache_info(src) for src in sources}} + with CACHE_FILE.open("wb") as fobj: + pickle.dump(new_cache, fobj, protocol=pickle.HIGHEST_PROTOCOL) + except OSError: + pass + + if __name__ == "__main__": main() diff --git a/setup.py b/setup.py index 13969df..4e9a5c9 100644 --- a/setup.py +++ b/setup.py @@ -40,7 +40,7 @@ setup( package_data={"blib2to3": ["*.txt"]}, python_requires=">=3.6", zip_safe=False, - install_requires=["click", "attrs>=17.4.0"], + install_requires=["click", "attrs>=17.4.0", "appdirs"], test_suite="tests.test_black", classifiers=[ "Development Status :: 3 - Alpha", diff --git a/tests/test_black.py b/tests/test_black.py index a4d2382..a64033c 100644 --- a/tests/test_black.py +++ b/tests/test_black.py @@ -1,14 +1,18 @@ #!/usr/bin/env python3 +import asyncio +from contextlib import contextmanager from functools import partial from io import StringIO import os from pathlib import Path import sys -from typing import Any, List, Tuple +from tempfile import TemporaryDirectory +from typing import Any, List, Tuple, Iterator import unittest from unittest.mock import patch from click import unstyle +from click.testing import CliRunner import black @@ -46,6 +50,32 @@ def read_data(name: str) -> Tuple[str, str]: return "".join(_input).strip() + "\n", "".join(_output).strip() + "\n" +@contextmanager +def cache_dir(exists: bool = True) -> Iterator[Path]: + with TemporaryDirectory() as workspace: + cache_dir = Path(workspace) + if not exists: + cache_dir = cache_dir / "new" + cache_file = cache_dir / "cache.pkl" + with patch("black.CACHE_DIR", cache_dir), patch("black.CACHE_FILE", cache_file): + yield cache_dir + + +@contextmanager +def event_loop(close: bool) -> Iterator[None]: + policy = asyncio.get_event_loop_policy() + old_loop = policy.get_event_loop() + loop = policy.new_event_loop() + asyncio.set_event_loop(loop) + try: + yield + + finally: + policy.set_event_loop(old_loop) + if close: + loop.close() + + class BlackTestCase(unittest.TestCase): maxDiff = None @@ -75,7 +105,7 @@ class BlackTestCase(unittest.TestCase): self.assertFormatEqual(expected, actual) black.assert_equivalent(source, actual) black.assert_stable(source, actual, line_length=ll) - self.assertFalse(ff(THIS_FILE)) + self.assertIs(ff(THIS_FILE), black.Changed.NO) @patch("black.dump_to_file", dump_to_stderr) def test_black(self) -> None: @@ -84,7 +114,7 @@ class BlackTestCase(unittest.TestCase): self.assertFormatEqual(expected, actual) black.assert_equivalent(source, actual) black.assert_stable(source, actual, line_length=ll) - self.assertFalse(ff(THIS_DIR / ".." / "black.py")) + self.assertIs(ff(THIS_DIR / ".." / "black.py"), black.Changed.NO) def test_piping(self) -> None: source, expected = read_data("../black") @@ -127,7 +157,7 @@ class BlackTestCase(unittest.TestCase): self.assertFormatEqual(expected, actual) black.assert_equivalent(source, actual) black.assert_stable(source, actual, line_length=ll) - self.assertFalse(ff(THIS_DIR / ".." / "setup.py")) + self.assertIs(ff(THIS_DIR / ".." / "setup.py"), black.Changed.NO) @patch("black.dump_to_file", dump_to_stderr) def test_function(self) -> None: @@ -291,67 +321,76 @@ class BlackTestCase(unittest.TestCase): err_lines.append(msg) with patch("black.out", out), patch("black.err", err): - report.done(Path("f1"), changed=False) + report.done(Path("f1"), black.Changed.NO) self.assertEqual(len(out_lines), 1) self.assertEqual(len(err_lines), 0) self.assertEqual(out_lines[-1], "f1 already well formatted, good job.") self.assertEqual(unstyle(str(report)), "1 file left unchanged.") self.assertEqual(report.return_code, 0) - report.done(Path("f2"), changed=True) + report.done(Path("f2"), black.Changed.YES) self.assertEqual(len(out_lines), 2) self.assertEqual(len(err_lines), 0) self.assertEqual(out_lines[-1], "reformatted f2") self.assertEqual( unstyle(str(report)), "1 file reformatted, 1 file left unchanged." ) + report.done(Path("f3"), black.Changed.CACHED) + self.assertEqual(len(out_lines), 3) + self.assertEqual(len(err_lines), 0) + self.assertEqual( + out_lines[-1], "f3 wasn't modified on disk since last run." + ) + self.assertEqual( + unstyle(str(report)), "1 file reformatted, 2 files left unchanged." + ) self.assertEqual(report.return_code, 0) report.check = True self.assertEqual(report.return_code, 1) report.check = False report.failed(Path("e1"), "boom") - self.assertEqual(len(out_lines), 2) + self.assertEqual(len(out_lines), 3) self.assertEqual(len(err_lines), 1) self.assertEqual(err_lines[-1], "error: cannot format e1: boom") self.assertEqual( unstyle(str(report)), - "1 file reformatted, 1 file left unchanged, " + "1 file reformatted, 2 files left unchanged, " "1 file failed to reformat.", ) self.assertEqual(report.return_code, 123) - report.done(Path("f3"), changed=True) - self.assertEqual(len(out_lines), 3) + report.done(Path("f3"), black.Changed.YES) + self.assertEqual(len(out_lines), 4) self.assertEqual(len(err_lines), 1) self.assertEqual(out_lines[-1], "reformatted f3") self.assertEqual( unstyle(str(report)), - "2 files reformatted, 1 file left unchanged, " + "2 files reformatted, 2 files left unchanged, " "1 file failed to reformat.", ) self.assertEqual(report.return_code, 123) report.failed(Path("e2"), "boom") - self.assertEqual(len(out_lines), 3) + self.assertEqual(len(out_lines), 4) self.assertEqual(len(err_lines), 2) self.assertEqual(err_lines[-1], "error: cannot format e2: boom") self.assertEqual( unstyle(str(report)), - "2 files reformatted, 1 file left unchanged, " + "2 files reformatted, 2 files left unchanged, " "2 files failed to reformat.", ) self.assertEqual(report.return_code, 123) - report.done(Path("f4"), changed=False) - self.assertEqual(len(out_lines), 4) + report.done(Path("f4"), black.Changed.NO) + self.assertEqual(len(out_lines), 5) self.assertEqual(len(err_lines), 2) self.assertEqual(out_lines[-1], "f4 already well formatted, good job.") self.assertEqual( unstyle(str(report)), - "2 files reformatted, 2 files left unchanged, " + "2 files reformatted, 3 files left unchanged, " "2 files failed to reformat.", ) self.assertEqual(report.return_code, 123) report.check = True self.assertEqual( unstyle(str(report)), - "2 files would be reformatted, 2 files would be left unchanged, " + "2 files would be reformatted, 3 files would be left unchanged, " "2 files would fail to reformat.", ) @@ -442,6 +481,120 @@ class BlackTestCase(unittest.TestCase): self.assertTrue("Actual tree:" in out_str) self.assertEqual("".join(err_lines), "") + def test_cache_broken_file(self) -> None: + with cache_dir() as workspace: + with black.CACHE_FILE.open("w") as fobj: + fobj.write("this is not a pickle") + self.assertEqual(black.read_cache(), {}) + src = (workspace / "test.py").resolve() + with src.open("w") as fobj: + fobj.write("print('hello')") + result = CliRunner().invoke(black.main, [str(src)]) + self.assertEqual(result.exit_code, 0) + cache = black.read_cache() + self.assertIn(src, cache) + + def test_cache_single_file_already_cached(self) -> None: + with cache_dir() as workspace: + src = (workspace / "test.py").resolve() + with src.open("w") as fobj: + fobj.write("print('hello')") + black.write_cache({}, [src]) + result = CliRunner().invoke(black.main, [str(src)]) + self.assertEqual(result.exit_code, 0) + with src.open("r") as fobj: + self.assertEqual(fobj.read(), "print('hello')") + + @event_loop(close=False) + def test_cache_multiple_files(self) -> None: + with cache_dir() as workspace: + one = (workspace / "one.py").resolve() + with one.open("w") as fobj: + fobj.write("print('hello')") + two = (workspace / "two.py").resolve() + with two.open("w") as fobj: + fobj.write("print('hello')") + black.write_cache({}, [one]) + result = CliRunner().invoke(black.main, [str(workspace)]) + self.assertEqual(result.exit_code, 0) + with one.open("r") as fobj: + self.assertEqual(fobj.read(), "print('hello')") + with two.open("r") as fobj: + self.assertEqual(fobj.read(), 'print("hello")\n') + cache = black.read_cache() + self.assertIn(one, cache) + self.assertIn(two, cache) + + def test_no_cache_when_writeback_diff(self) -> None: + with cache_dir() as workspace: + src = (workspace / "test.py").resolve() + with src.open("w") as fobj: + fobj.write("print('hello')") + result = CliRunner().invoke(black.main, [str(src), "--diff"]) + self.assertEqual(result.exit_code, 0) + self.assertFalse(black.CACHE_FILE.exists()) + + def test_no_cache_when_stdin(self) -> None: + with cache_dir(): + result = CliRunner().invoke(black.main, ["-"], input="print('hello')") + self.assertEqual(result.exit_code, 0) + self.assertFalse(black.CACHE_FILE.exists()) + + def test_read_cache_no_cachefile(self) -> None: + with cache_dir(): + self.assertEqual(black.read_cache(), {}) + + def test_write_cache_read_cache(self) -> None: + with cache_dir() as workspace: + src = (workspace / "test.py").resolve() + src.touch() + black.write_cache({}, [src]) + cache = black.read_cache() + self.assertIn(src, cache) + self.assertEqual(cache[src], black.get_cache_info(src)) + + def test_filter_cached(self) -> None: + with TemporaryDirectory() as workspace: + path = Path(workspace) + uncached = (path / "uncached").resolve() + cached = (path / "cached").resolve() + cached_but_changed = (path / "changed").resolve() + uncached.touch() + cached.touch() + cached_but_changed.touch() + cache = {cached: black.get_cache_info(cached), cached_but_changed: (0.0, 0)} + todo, done = black.filter_cached( + cache, [uncached, cached, cached_but_changed] + ) + self.assertEqual(todo, [uncached, cached_but_changed]) + self.assertEqual(done, [cached]) + + def test_write_cache_creates_directory_if_needed(self) -> None: + with cache_dir(exists=False) as workspace: + self.assertFalse(workspace.exists()) + black.write_cache({}, []) + self.assertTrue(workspace.exists()) + + @event_loop(close=False) + def test_failed_formatting_does_not_get_cached(self) -> None: + with cache_dir() as workspace: + failing = (workspace / "failing.py").resolve() + with failing.open("w") as fobj: + fobj.write("not actually python") + clean = (workspace / "clean.py").resolve() + with clean.open("w") as fobj: + fobj.write('print("hello")\n') + result = CliRunner().invoke(black.main, [str(workspace)]) + self.assertEqual(result.exit_code, 123) + cache = black.read_cache() + self.assertNotIn(failing, cache) + self.assertIn(clean, cache) + + def test_write_cache_write_fail(self): + with cache_dir(), patch.object(Path, "open") as mock: + mock.side_effect = OSError + black.write_cache({}, []) + if __name__ == "__main__": unittest.main()