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# util/tool_support.py
# Copyright (C) 2005-2025 the SQLAlchemy authors and contributors
# <see AUTHORS file>
#
# This module is part of SQLAlchemy and is released under
# the MIT License: https://www.opensource.org/licenses/mit-license.php
# mypy: allow-untyped-defs, allow-untyped-calls
"""support routines for the helpers in tools/.
These aren't imported by the enclosing util package as the are not
needed for normal library use.
"""
from __future__ import annotations
from argparse import ArgumentParser
from argparse import Namespace
import contextlib
import difflib
import os
from pathlib import Path
import shlex
import shutil
import subprocess
import sys
from typing import Any
from typing import Dict
from typing import Iterator
from typing import Optional
from typing import Union
from . import compat
class code_writer_cmd:
parser: ArgumentParser
args: Namespace
suppress_output: bool
diffs_detected: bool
source_root: Path
pyproject_toml_path: Path
def __init__(self, tool_script: str):
self.source_root = Path(tool_script).parent.parent
self.pyproject_toml_path = self.source_root / Path("pyproject.toml")
assert self.pyproject_toml_path.exists()
self.parser = ArgumentParser()
self.parser.add_argument(
"--stdout",
action="store_true",
help="Write to stdout instead of saving to file",
)
self.parser.add_argument(
"-c",
"--check",
help="Don't write the files back, just return the "
"status. Return code 0 means nothing would change. "
"Return code 1 means some files would be reformatted",
action="store_true",
)
def run_zimports(self, tempfile: str) -> None:
self._run_console_script(
str(tempfile),
{
"entrypoint": "zimports",
"options": f"--toml-config {self.pyproject_toml_path}",
},
)
def run_black(self, tempfile: str) -> None:
self._run_console_script(
str(tempfile),
{
"entrypoint": "black",
"options": f"--config {self.pyproject_toml_path}",
},
)
def _run_console_script(self, path: str, options: Dict[str, Any]) -> None:
"""Run a Python console application from within the process.
Used for black, zimports
"""
is_posix = os.name == "posix"
entrypoint_name = options["entrypoint"]
for entry in compat.importlib_metadata_get("console_scripts"):
if entry.name == entrypoint_name:
impl = entry
break
else:
raise Exception(
f"Could not find entrypoint console_scripts.{entrypoint_name}"
)
cmdline_options_str = options.get("options", "")
cmdline_options_list = shlex.split(
cmdline_options_str, posix=is_posix
) + [path]
kw: Dict[str, Any] = {}
if self.suppress_output:
kw["stdout"] = kw["stderr"] = subprocess.DEVNULL
subprocess.run(
[
sys.executable,
"-c",
"import %s; %s.%s()" % (impl.module, impl.module, impl.attr),
]
+ cmdline_options_list,
cwd=str(self.source_root),
**kw,
)
def write_status(self, *text: str) -> None:
if not self.suppress_output:
sys.stderr.write(" ".join(text))
def write_output_file_from_text(
self, text: str, destination_path: Union[str, Path]
) -> None:
if self.args.check:
self._run_diff(destination_path, source=text)
elif self.args.stdout:
print(text)
else:
self.write_status(f"Writing {destination_path}...")
Path(destination_path).write_text(
text, encoding="utf-8", newline="\n"
)
self.write_status("done\n")
def write_output_file_from_tempfile(
self, tempfile: str, destination_path: str
) -> None:
if self.args.check:
self._run_diff(destination_path, source_file=tempfile)
os.unlink(tempfile)
elif self.args.stdout:
with open(tempfile) as tf:
print(tf.read())
os.unlink(tempfile)
else:
self.write_status(f"Writing {destination_path}...")
shutil.move(tempfile, destination_path)
self.write_status("done\n")
def _run_diff(
self,
destination_path: Union[str, Path],
*,
source: Optional[str] = None,
source_file: Optional[str] = None,
) -> None:
if source_file:
with open(source_file, encoding="utf-8") as tf:
source_lines = list(tf)
elif source is not None:
source_lines = source.splitlines(keepends=True)
else:
assert False, "source or source_file is required"
with open(destination_path, encoding="utf-8") as dp:
d = difflib.unified_diff(
list(dp),
source_lines,
fromfile=Path(destination_path).as_posix(),
tofile="<proposed changes>",
n=3,
lineterm="\n",
)
d_as_list = list(d)
if d_as_list:
self.diffs_detected = True
print("".join(d_as_list))
@contextlib.contextmanager
def add_arguments(self) -> Iterator[ArgumentParser]:
yield self.parser
@contextlib.contextmanager
def run_program(self) -> Iterator[None]:
self.args = self.parser.parse_args()
if self.args.check:
self.diffs_detected = False
self.suppress_output = True
elif self.args.stdout:
self.suppress_output = True
else:
self.suppress_output = False
yield
if self.args.check and self.diffs_detected:
sys.exit(1)
else:
sys.exit(0)