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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:]

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