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import os.path
from typing import Mapping
from typing import Optional
from typing import Tuple
from typing import TYPE_CHECKING
from identify.identify import parse_shebang_from_file
if TYPE_CHECKING:
from typing import NoReturn
class ExecutableNotFoundError(OSError):
def to_output(self) -> Tuple[int, bytes, None]:
return (1, self.args[0].encode(), None)
def parse_filename(filename: str) -> Tuple[str, ...]:
if not os.path.exists(filename):
return ()
else:
return parse_shebang_from_file(filename)
def find_executable(
exe: str, _environ: Optional[Mapping[str, str]] = None,
) -> Optional[str]:
exe = os.path.normpath(exe)
if os.sep in exe:
return exe
environ = _environ if _environ is not None else os.environ
if 'PATHEXT' in environ:
exts = environ['PATHEXT'].split(os.pathsep)
possible_exe_names = tuple(f'{exe}{ext}' for ext in exts) + (exe,)
else:
possible_exe_names = (exe,)
for path in environ.get('PATH', '').split(os.pathsep):
for possible_exe_name in possible_exe_names:
joined = os.path.join(path, possible_exe_name)
if os.path.isfile(joined) and os.access(joined, os.X_OK):
return joined
else:
return None
def normexe(orig: str) -> str:
def _error(msg: str) -> 'NoReturn':
raise ExecutableNotFoundError(f'Executable `{orig}` {msg}')
if os.sep not in orig and (not os.altsep or os.altsep not in orig):
exe = find_executable(orig)
if exe is None:
_error('not found')
return exe
elif os.path.isdir(orig):
_error('is a directory')
elif not os.path.isfile(orig):
_error('not found')
elif not os.access(orig, os.X_OK): # pragma: win32 no cover
_error('is not executable')
else:
return orig
def normalize_cmd(cmd: Tuple[str, ...]) -> Tuple[str, ...]:
"""Fixes for the following issues on windows
- https://bugs.python.org/issue8557
- windows does not parse shebangs
This function also makes deep-path shebangs work just fine
"""
# Use PATH to determine the executable
exe = normexe(cmd[0])
# Figure out the shebang from the resulting command
cmd = parse_filename(exe) + (exe,) + cmd[1:]
# This could have given us back another bare executable
exe = normexe(cmd[0])
return (exe,) + cmd[1:]
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