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Don't run Docker workflow on push to forks (#2324)
[etc/vim.git] / gallery / gallery.py
1 import atexit
2 import json
3 import subprocess
4 import tarfile
5 import tempfile
6 import traceback
7 import venv
8 import zipfile
9 from argparse import ArgumentParser, Namespace
10 from concurrent.futures import ThreadPoolExecutor
11 from functools import lru_cache, partial
12 from pathlib import Path
13 from typing import (  # type: ignore # typing can't see Literal
14     Generator,
15     List,
16     Literal,
17     NamedTuple,
18     Optional,
19     Tuple,
20     Union,
21     cast,
22 )
23 from urllib.request import urlopen, urlretrieve
24
25 PYPI_INSTANCE = "https://pypi.org/pypi"
26 PYPI_TOP_PACKAGES = (
27     "https://hugovk.github.io/top-pypi-packages/top-pypi-packages-{days}-days.json"
28 )
29 INTERNAL_BLACK_REPO = f"{tempfile.gettempdir()}/__black"
30
31 ArchiveKind = Union[tarfile.TarFile, zipfile.ZipFile]
32 Days = Union[Literal[30], Literal[365]]
33
34 subprocess.run = partial(subprocess.run, check=True)  # type: ignore
35 # https://github.com/python/mypy/issues/1484
36
37
38 class BlackVersion(NamedTuple):
39     version: str
40     config: Optional[str] = None
41
42
43 def get_pypi_download_url(package: str, version: Optional[str]) -> str:
44     with urlopen(PYPI_INSTANCE + f"/{package}/json") as page:
45         metadata = json.load(page)
46
47     if version is None:
48         sources = metadata["urls"]
49     else:
50         if version in metadata["releases"]:
51             sources = metadata["releases"][version]
52         else:
53             raise ValueError(
54                 f"No releases found with version ('{version}') tag. "
55                 f"Found releases: {metadata['releases'].keys()}"
56             )
57
58     for source in sources:
59         if source["python_version"] == "source":
60             break
61     else:
62         raise ValueError(f"Couldn't find any sources for {package}")
63
64     return cast(str, source["url"])
65
66
67 def get_top_packages(days: Days) -> List[str]:
68     with urlopen(PYPI_TOP_PACKAGES.format(days=days)) as page:
69         result = json.load(page)
70
71     return [package["project"] for package in result["rows"]]
72
73
74 def get_package_source(package: str, version: Optional[str]) -> str:
75     if package == "cpython":
76         if version is None:
77             version = "main"
78         return f"https://github.com/python/cpython/archive/{version}.zip"
79     elif package == "pypy":
80         if version is None:
81             version = "branch/default"
82         return (
83             f"https://foss.heptapod.net/pypy/pypy/repository/{version}/archive.tar.bz2"
84         )
85     else:
86         return get_pypi_download_url(package, version)
87
88
89 def get_archive_manager(local_file: str) -> ArchiveKind:
90     if tarfile.is_tarfile(local_file):
91         return tarfile.open(local_file)
92     elif zipfile.is_zipfile(local_file):
93         return zipfile.ZipFile(local_file)
94     else:
95         raise ValueError("Unknown archive kind.")
96
97
98 def get_first_archive_member(archive: ArchiveKind) -> str:
99     if isinstance(archive, tarfile.TarFile):
100         return archive.getnames()[0]
101     elif isinstance(archive, zipfile.ZipFile):
102         return archive.namelist()[0]
103
104
105 def download_and_extract(package: str, version: Optional[str], directory: Path) -> Path:
106     source = get_package_source(package, version)
107
108     local_file, _ = urlretrieve(source, directory / f"{package}-src")
109     with get_archive_manager(local_file) as archive:
110         archive.extractall(path=directory)
111         result_dir = get_first_archive_member(archive)
112     return directory / result_dir
113
114
115 def get_package(
116     package: str, version: Optional[str], directory: Path
117 ) -> Optional[Path]:
118     try:
119         return download_and_extract(package, version, directory)
120     except Exception:
121         print(f"Caught an exception while downloading {package}.")
122         traceback.print_exc()
123         return None
124
125
126 DEFAULT_SLICE = slice(None)  # for flake8
127
128
129 def download_and_extract_top_packages(
130     directory: Path,
131     days: Days = 365,
132     workers: int = 8,
133     limit: slice = DEFAULT_SLICE,
134 ) -> Generator[Path, None, None]:
135     with ThreadPoolExecutor(max_workers=workers) as executor:
136         bound_downloader = partial(get_package, version=None, directory=directory)
137         for package in executor.map(bound_downloader, get_top_packages(days)[limit]):
138             if package is not None:
139                 yield package
140
141
142 def git_create_repository(repo: Path) -> None:
143     subprocess.run(["git", "init"], cwd=repo)
144     git_add_and_commit(msg="Initial commit", repo=repo)
145
146
147 def git_add_and_commit(msg: str, repo: Path) -> None:
148     subprocess.run(["git", "add", "."], cwd=repo)
149     subprocess.run(["git", "commit", "-m", msg, "--allow-empty"], cwd=repo)
150
151
152 def git_switch_branch(
153     branch: str, repo: Path, new: bool = False, from_branch: Optional[str] = None
154 ) -> None:
155     args = ["git", "checkout"]
156     if new:
157         args.append("-b")
158     args.append(branch)
159     if from_branch:
160         args.append(from_branch)
161     subprocess.run(args, cwd=repo)
162
163
164 def init_repos(options: Namespace) -> Tuple[Path, ...]:
165     options.output.mkdir(exist_ok=True)
166
167     if options.top_packages:
168         source_directories = tuple(
169             download_and_extract_top_packages(
170                 directory=options.output,
171                 workers=options.workers,
172                 limit=slice(None, options.top_packages),
173             )
174         )
175     else:
176         source_directories = (
177             download_and_extract(
178                 package=options.pypi_package,
179                 version=options.version,
180                 directory=options.output,
181             ),
182         )
183
184     for source_directory in source_directories:
185         git_create_repository(source_directory)
186
187     if options.black_repo is None:
188         subprocess.run(
189             ["git", "clone", "https://github.com/psf/black.git", INTERNAL_BLACK_REPO],
190             cwd=options.output,
191         )
192         options.black_repo = options.output / INTERNAL_BLACK_REPO
193
194     return source_directories
195
196
197 @lru_cache(8)
198 def black_runner(version: str, black_repo: Path) -> Path:
199     directory = tempfile.TemporaryDirectory()
200     venv.create(directory.name, with_pip=True)
201
202     python = Path(directory.name) / "bin" / "python"
203     subprocess.run([python, "-m", "pip", "install", "-e", black_repo])
204
205     atexit.register(directory.cleanup)
206     return python
207
208
209 def format_repo_with_version(
210     repo: Path,
211     from_branch: Optional[str],
212     black_repo: Path,
213     black_version: BlackVersion,
214     input_directory: Path,
215 ) -> str:
216     current_branch = f"black-{black_version.version}"
217     git_switch_branch(black_version.version, repo=black_repo)
218     git_switch_branch(current_branch, repo=repo, new=True, from_branch=from_branch)
219
220     format_cmd: List[Union[Path, str]] = [
221         black_runner(black_version.version, black_repo),
222         (black_repo / "black.py").resolve(),
223         ".",
224     ]
225     if black_version.config:
226         format_cmd.extend(["--config", input_directory / black_version.config])
227
228     subprocess.run(format_cmd, cwd=repo, check=False)  # ensure the process
229     # continuess to run even it can't format some files. Reporting those
230     # should be enough
231     git_add_and_commit(f"Format with black:{black_version.version}", repo=repo)
232
233     return current_branch
234
235
236 def format_repos(repos: Tuple[Path, ...], options: Namespace) -> None:
237     black_versions = tuple(
238         BlackVersion(*version.split(":")) for version in options.versions
239     )
240
241     for repo in repos:
242         from_branch = None
243         for black_version in black_versions:
244             from_branch = format_repo_with_version(
245                 repo=repo,
246                 from_branch=from_branch,
247                 black_repo=options.black_repo,
248                 black_version=black_version,
249                 input_directory=options.input,
250             )
251         git_switch_branch("main", repo=repo)
252
253     git_switch_branch("main", repo=options.black_repo)
254
255
256 def main() -> None:
257     parser = ArgumentParser(
258         description="""Black Gallery is a script that
259     automates the process of applying different Black versions to a selected
260     PyPI package and seeing the results between versions."""
261     )
262
263     group = parser.add_mutually_exclusive_group(required=True)
264     group.add_argument("-p", "--pypi-package", help="PyPI package to download.")
265     group.add_argument(
266         "-t", "--top-packages", help="Top n PyPI packages to download.", type=int
267     )
268
269     parser.add_argument("-b", "--black-repo", help="Black's Git repository.", type=Path)
270     parser.add_argument(
271         "-v",
272         "--version",
273         help=(
274             "Version for given PyPI package. Will be discarded if used with -t option."
275         ),
276     )
277     parser.add_argument(
278         "-w",
279         "--workers",
280         help=(
281             "Maximum number of threads to download with at the same time. "
282             "Will be discarded if used with -p option."
283         ),
284     )
285     parser.add_argument(
286         "-i",
287         "--input",
288         default=Path("/input"),
289         type=Path,
290         help="Input directory to read configuration.",
291     )
292     parser.add_argument(
293         "-o",
294         "--output",
295         default=Path("/output"),
296         type=Path,
297         help="Output directory to download and put result artifacts.",
298     )
299     parser.add_argument("versions", nargs="*", default=("main",), help="")
300
301     options = parser.parse_args()
302     repos = init_repos(options)
303     format_repos(repos, options)
304
305
306 if __name__ == "__main__":
307     main()