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"""Utility functions for finding modules
Utility functions for finding modules on sys.path.
`find_module` returns a path to module or None, given certain conditions.
"""
#-----------------------------------------------------------------------------
# Copyright (c) 2011, the IPython Development Team.
#
# Distributed under the terms of the Modified BSD License.
#
# The full license is in the file COPYING.txt, distributed with this software.
#-----------------------------------------------------------------------------
#-----------------------------------------------------------------------------
# Imports
#-----------------------------------------------------------------------------
# Stdlib imports
import importlib
import os
# Third-party imports
# Our own imports
#-----------------------------------------------------------------------------
# Globals and constants
#-----------------------------------------------------------------------------
#-----------------------------------------------------------------------------
# Local utilities
#-----------------------------------------------------------------------------
#-----------------------------------------------------------------------------
# Classes and functions
#-----------------------------------------------------------------------------
def find_mod(module_name):
"""
Find module `module_name` on sys.path, and return the path to module `module_name`.
- If `module_name` refers to a module directory, then return path to __init__ file.
- If `module_name` is a directory without an __init__file, return None.
- If module is missing or does not have a `.py` or `.pyw` extension, return None.
- Note that we are not interested in running bytecode.
- Otherwise, return the fill path of the module.
Parameters
----------
module_name : str
Returns
-------
module_path : str
Path to module `module_name`, its __init__.py, or None,
depending on above conditions.
"""
loader = importlib.util.find_spec(module_name)
module_path = loader.origin
if module_path is None:
return None
else:
split_path = module_path.split(".")
if split_path[-1] in ["py", "pyw"]:
return module_path
else:
return None
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