mirror of
https://github.com/pre-commit/pre-commit.git
synced 2026-01-13 12:30:08 -06:00
162 lines
3.7 KiB
Python
162 lines
3.7 KiB
Python
from __future__ import unicode_literals
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import contextlib
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import functools
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import hashlib
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import os
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import os.path
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import shutil
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import subprocess
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import tarfile
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import tempfile
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import pkg_resources
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@contextlib.contextmanager
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def cwd(path):
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original_cwd = os.getcwd()
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os.chdir(path)
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try:
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yield
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finally:
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os.chdir(original_cwd)
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def memoize_by_cwd(func):
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"""Memoize a function call based on os.getcwd()."""
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@functools.wraps(func)
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def wrapper(*args):
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cwd = os.getcwd()
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key = (cwd,) + args
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try:
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return wrapper._cache[key]
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except KeyError:
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ret = wrapper._cache[key] = func(*args)
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return ret
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wrapper._cache = {}
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return wrapper
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@contextlib.contextmanager
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def clean_path_on_failure(path):
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"""Cleans up the directory on an exceptional failure."""
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try:
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yield
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except BaseException:
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if os.path.exists(path):
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shutil.rmtree(path)
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raise
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@contextlib.contextmanager
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def noop_context():
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yield
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def shell_escape(arg):
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return "'" + arg.replace("'", "'\"'\"'".strip()) + "'"
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def hex_md5(s):
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"""Hexdigest an md5 of the string.
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:param text s:
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"""
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return hashlib.md5(s.encode('utf-8')).hexdigest()
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@contextlib.contextmanager
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def tarfile_open(*args, **kwargs):
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"""Compatibility layer because python2.6"""
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tf = tarfile.open(*args, **kwargs)
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try:
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yield tf
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finally:
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tf.close()
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@contextlib.contextmanager
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def tmpdir():
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"""Contextmanager to create a temporary directory. It will be cleaned up
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afterwards.
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"""
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tempdir = tempfile.mkdtemp()
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try:
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yield tempdir
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finally:
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shutil.rmtree(tempdir)
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def resource_filename(filename):
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return pkg_resources.resource_filename(
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'pre_commit',
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os.path.join('resources', filename),
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)
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class CalledProcessError(RuntimeError):
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def __init__(self, returncode, cmd, expected_returncode, output=None):
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super(CalledProcessError, self).__init__(
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returncode, cmd, expected_returncode, output,
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)
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self.returncode = returncode
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self.cmd = cmd
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self.expected_returncode = expected_returncode
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self.output = output
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def __str__(self):
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output = []
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for text in self.output:
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if text:
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output.append('\n ' + text.replace('\n', '\n '))
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else:
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output.append('(none)')
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return (
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'Command: {0!r}\n'
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'Return code: {1}\n'
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'Expected return code: {2}\n'
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'Output: {3}\n'
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'Errors: {4}\n'.format(
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self.cmd,
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self.returncode,
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self.expected_returncode,
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*output
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)
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)
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def cmd_output(*cmd, **kwargs):
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retcode = kwargs.pop('retcode', 0)
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stdin = kwargs.pop('stdin', None)
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encoding = kwargs.pop('encoding', 'UTF-8')
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__popen = kwargs.pop('__popen', subprocess.Popen)
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popen_kwargs = {
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'stdin': subprocess.PIPE,
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'stdout': subprocess.PIPE,
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'stderr': subprocess.PIPE,
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}
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if stdin is not None:
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stdin = stdin.encode('UTF-8')
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popen_kwargs.update(kwargs)
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proc = __popen(cmd, **popen_kwargs)
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stdout, stderr = proc.communicate(stdin)
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if encoding is not None and stdout is not None:
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stdout = stdout.decode(encoding)
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if encoding is not None and stderr is not None:
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stderr = stderr.decode(encoding)
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returncode = proc.returncode
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if retcode is not None and retcode != returncode:
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raise CalledProcessError(
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returncode, cmd, retcode, output=(stdout, stderr),
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)
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return proc.returncode, stdout, stderr
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