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74 lines
1.9 KiB
Python
74 lines
1.9 KiB
Python
from __future__ import absolute_import
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from __future__ import unicode_literals
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import os.path
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from identify.identify import parse_shebang_from_file
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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_filename(filename):
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if not os.path.exists(filename):
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return ()
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else:
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return parse_shebang_from_file(filename)
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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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- https://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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