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42000c4521
- The bare exe was the first filename attempted to match, this changes means it will be matched last, allowing other files to be matched if they exist. The result is that eslint now works on Windows.
101 lines
2.5 KiB
Python
101 lines
2.5 KiB
Python
from __future__ import absolute_import
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from __future__ import unicode_literals
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import io
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import os.path
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import shlex
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import string
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printable = frozenset(string.printable)
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class ExecutableNotFoundError(OSError):
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def to_output(self):
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return (1, self.args[0].encode('UTF-8'), b'')
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def parse_bytesio(bytesio):
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"""Parse the shebang from a file opened for reading binary."""
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if bytesio.read(2) != b'#!':
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return ()
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first_line = bytesio.readline()
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try:
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first_line = first_line.decode('US-ASCII')
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except UnicodeDecodeError:
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return ()
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# Require only printable ascii
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for c in first_line:
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if c not in printable:
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return ()
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cmd = tuple(shlex.split(first_line))
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if cmd[0] == '/usr/bin/env':
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cmd = cmd[1:]
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return cmd
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def parse_filename(filename):
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"""Parse the shebang given a filename."""
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if not os.path.exists(filename) or not os.access(filename, os.X_OK):
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return ()
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with io.open(filename, 'rb') as f:
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return parse_bytesio(f)
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def find_executable(exe, _environ=None):
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exe = os.path.normpath(exe)
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if os.sep in exe:
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return exe
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environ = _environ if _environ is not None else os.environ
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if 'PATHEXT' in environ:
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possible_exe_names = tuple(
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exe + ext.lower() for ext in environ['PATHEXT'].split(os.pathsep)
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) + (exe,)
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else:
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possible_exe_names = (exe,)
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for path in environ.get('PATH', '').split(os.pathsep):
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for possible_exe_name in possible_exe_names:
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joined = os.path.join(path, possible_exe_name)
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if os.path.isfile(joined) and os.access(joined, os.X_OK):
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return joined
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else:
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return None
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def normexe(orig_exe):
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if os.sep not in orig_exe:
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exe = find_executable(orig_exe)
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if exe is None:
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raise ExecutableNotFoundError(
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'Executable `{}` not found'.format(orig_exe),
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)
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return exe
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else:
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return orig_exe
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def normalize_cmd(cmd):
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"""Fixes for the following issues on windows
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- http://bugs.python.org/issue8557
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- windows does not parse shebangs
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This function also makes deep-path shebangs work just fine
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"""
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# Use PATH to determine the executable
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exe = normexe(cmd[0])
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# Figure out the shebang from the resulting command
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cmd = parse_filename(exe) + (exe,) + cmd[1:]
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# This could have given us back another bare executable
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exe = normexe(cmd[0])
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return (exe,) + cmd[1:]
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