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parse_shebang.py
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73 lines (53 loc) · 1.87 KB
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from __future__ import absolute_import
from __future__ import unicode_literals
import os.path
from identify.identify import parse_shebang_from_file
class ExecutableNotFoundError(OSError):
def to_output(self):
return (1, self.args[0].encode('UTF-8'), b'')
def parse_filename(filename):
if not os.path.exists(filename):
return ()
else:
return parse_shebang_from_file(filename)
def find_executable(exe, _environ=None):
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:
possible_exe_names = tuple(
exe + ext.lower() for ext in environ['PATHEXT'].split(os.pathsep)
) + (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_exe):
if os.sep not in orig_exe:
exe = find_executable(orig_exe)
if exe is None:
raise ExecutableNotFoundError(
'Executable `{}` not found'.format(orig_exe),
)
return exe
else:
return orig_exe
def normalize_cmd(cmd):
"""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:]