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epylint.py
# mode: python; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 # -*- vim:fenc=utf-8:ft=python:et:sw=4:ts=4:sts=4 # Licensed under the GPL: https://www.gnu.org/licenses/old-licenses/gpl-2.0.html # For details: https://github.com/PyCQA/pylint/blob/main/LICENSE # Copyright (c) https://github.com/PyCQA/pylint/blob/main/CONTRIBUTORS.txt """Emacs and Flymake compatible Pylint. This script is for integration with Emacs and is compatible with Flymake mode. epylint walks out of python packages before invoking pylint. This avoids reporting import errors that occur when a module within a package uses the absolute import path to get another module within this package. For example: - Suppose a package is structured as a/__init__.py a/b/x.py a/c/y.py - Then if y.py imports x as "from a.b import x" the following produces pylint errors cd a/c; pylint y.py - The following obviously doesn't pylint a/c/y.py - As this script will be invoked by Emacs within the directory of the file we are checking we need to go out of it to avoid these false positives. You may also use py_run to run pylint with desired options and get back (or not) its output. """ from __future__ import annotations import os import shlex import sys import warnings from collections.abc import Sequence from io import StringIO from subprocess import PIPE, Popen from typing import NoReturn, TextIO, overload if sys.version_info >= (3, 8): from typing import Literal else: from typing_extensions import Literal def _get_env() -> dict[str, str]: """Extracts the environment PYTHONPATH and appends the current 'sys.path' to it. """ env = dict(os.environ) env["PYTHONPATH"] = os.pathsep.join(sys.path) return env def lint(filename: str, options: Sequence[str] = ()) -> int: """Pylint the given file. When run from Emacs we will be in the directory of a file, and passed its filename. If this file is part of a package and is trying to import other modules from within its own package or another package rooted in a directory below it, pylint will classify it as a failed import. To get around this, we traverse down the directory tree to find the root of the package this module is in. We then invoke pylint from this directory. Finally, we must correct the filenames in the output generated by pylint so Emacs doesn't become confused (it will expect just the original filename, while pylint may extend it with extra directories if we've traversed down the tree) """ # traverse downwards until we are out of a python package full_path = os.path.abspath(filename) parent_path = os.path.dirname(full_path) child_path = os.path.basename(full_path) while parent_path != "/" and os.path.exists( os.path.join(parent_path, "__init__.py") ): child_path = os.path.join(os.path.basename(parent_path), child_path) parent_path = os.path.dirname(parent_path) # Start pylint # Ensure we use the python and pylint associated with the running epylint run_cmd = "import sys; from pylint.lint import Run; Run(sys.argv[1:])" cmd = ( [sys.executable, "-c", run_cmd] + [ "--msg-template", "{path}:{line}: {category} ({msg_id}, {symbol}, {obj}) {msg}", "-r", "n", child_path, ] + list(options) ) with Popen( cmd, stdout=PIPE, cwd=parent_path, env=_get_env(), universal_newlines=True ) as process: for line in process.stdout: # type: ignore[union-attr] # remove pylintrc warning if line.startswith("No config file found"): continue # modify the file name that's put out to reverse the path traversal we made parts = line.split(":") if parts and parts[0] == child_path: line = ":".join([filename] + parts[1:]) print(line, end=" ") process.wait() return process.returncode @overload def py_run( command_options: str = ..., return_std: Literal[False] = ..., stdout: TextIO | int | None = ..., stderr: TextIO | int | None = ..., ) -> None: ... @overload def py_run( command_options: str, return_std: Literal[True], stdout: TextIO | int | None = ..., stderr: TextIO | int | None = ..., ) -> tuple[StringIO, StringIO]: ... def py_run( command_options: str = "", return_std: bool = False, stdout: TextIO | int | None = None, stderr: TextIO | int | None = None, ) -> tuple[StringIO, StringIO] | None: """Run pylint from python. ``command_options`` is a string containing ``pylint`` command line options; ``return_std`` (boolean) indicates return of created standard output and error (see below); ``stdout`` and ``stderr`` are 'file-like' objects in which standard output could be written. Calling agent is responsible for stdout/err management (creation, close). Default standard output and error are those from sys, or standalone ones (``subprocess.PIPE``) are used if they are not set and ``return_std``. If ``return_std`` is set to ``True``, this function returns a 2-uple containing standard output and error related to created process, as follows: ``(stdout, stderr)``. To silently run Pylint on a module, and get its standard output and error: >>> (pylint_stdout, pylint_stderr) = py_run( 'module_name.py', True) """ warnings.warn( "'epylint' will be removed in pylint 3.0, use https://github.com/emacsorphanage/pylint instead.", DeprecationWarning, stacklevel=2, ) # Detect if we use Python as executable or not, else default to `python` executable = sys.executable if "python" in sys.executable else "python" # Create command line to call pylint epylint_part = [executable, "-c", "from pylint import epylint;epylint.Run()"] options = shlex.split(command_options, posix=not sys.platform.startswith("win")) cli = epylint_part + options # Providing standard output and/or error if not set if stdout is None: stdout = PIPE if return_std else sys.stdout if stderr is None: stderr = PIPE if return_std else sys.stderr # Call pylint in a sub-process with Popen( cli, shell=False, stdout=stdout, stderr=stderr, env=_get_env(), universal_newlines=True, ) as process: proc_stdout, proc_stderr = process.communicate() # Return standard output and error if return_std: return StringIO(proc_stdout), StringIO(proc_stderr) return None def Run(argv: Sequence[str] | None = None) -> NoReturn: warnings.warn( "'epylint' will be removed in pylint 3.0, use https://github.com/emacsorphanage/pylint instead.", DeprecationWarning, stacklevel=2, ) if not argv and len(sys.argv) == 1: print(f"Usage: {sys.argv[0]} <filename> [options]") sys.exit(1) argv = argv or sys.argv[1:] if not os.path.exists(argv[0]): print(f"{argv[0]} does not exist") sys.exit(1) else: sys.exit(lint(argv[0], argv[1:])) if __name__ == "__main__": Run()
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