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""" Utility for locating a module (or package's __main__.py) with a given name and verifying it contains the PYTHON_ARGCOMPLETE_OK marker. The module name should be specified in a form usable with `python -m`. Intended to be invoked by argcomplete's global completion function. """ import os import sys import tokenize try: from importlib.util import find_spec except ImportError: from collections import namedtuple from imp import find_module ModuleSpec = namedtuple( 'ModuleSpec', ['origin', 'has_location', 'submodule_search_locations']) def find_spec(name): """Minimal implementation as required by `find`.""" try: f, path, _ = find_module(name) except ImportError: return None has_location = path is not None if f is None: return ModuleSpec(None, has_location, [path]) f.close() return ModuleSpec(path, has_location, None) class ArgcompleteMarkerNotFound(RuntimeError): pass def find(name, return_package=False): names = name.split('.') spec = find_spec(names[0]) if spec is None: raise ArgcompleteMarkerNotFound( 'no module named "{}"'.format(names[0])) if not spec.has_location: raise ArgcompleteMarkerNotFound('cannot locate file') if spec.submodule_search_locations is None: if len(names) != 1: raise ArgcompleteMarkerNotFound( '{} is not a package'.format(names[0])) return spec.origin if len(spec.submodule_search_locations) != 1: raise ArgcompleteMarkerNotFound('expecting one search location') path = os.path.join(spec.submodule_search_locations[0], *names[1:]) if os.path.isdir(path): filename = '__main__.py' if return_package: filename = '__init__.py' return os.path.join(path, filename) else: return path + '.py' def main(): try: name = sys.argv[1] except IndexError: raise ArgcompleteMarkerNotFound('missing argument on the command line') filename = find(name) if hasattr(tokenize, 'open'): open_func = tokenize.open else: open_func = open try: fp = open_func(filename) except OSError: raise ArgcompleteMarkerNotFound('cannot open file') with fp: head = fp.read(1024) if 'PYTHON_ARGCOMPLETE_OK' not in head: raise ArgcompleteMarkerNotFound('marker not found') if __name__ == '__main__': try: main() except ArgcompleteMarkerNotFound as e: sys.exit(e)