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"""Utility functions for finding modules
Utility functions for finding modules on sys.path.
`find_mod` finds named module on sys.path.
`get_init` helper function that finds __init__ file in a directory.
`find_module` variant of imp.find_module in std_lib that only returns
path to module and not an open file object as well.
"""
#-----------------------------------------------------------------------------
# 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
#-----------------------------------------------------------------------------
from __future__ import print_function
# Stdlib imports
import imp
import os
# Third-party imports
# Our own imports
#-----------------------------------------------------------------------------
# Globals and constants
#-----------------------------------------------------------------------------
#-----------------------------------------------------------------------------
# Local utilities
#-----------------------------------------------------------------------------
#-----------------------------------------------------------------------------
# Classes and functions
#-----------------------------------------------------------------------------
def find_module(name, path=None):
"""imp.find_module variant that only return path of module.
The `imp.find_module` returns a filehandle that we are not interested in.
Also we ignore any bytecode files that `imp.find_module` finds.
Parameters
----------
name : str
name of module to locate
path : list of str
list of paths to search for `name`. If path=None then search sys.path
Returns
-------
filename : str
Return full path of module or None if module is missing or does not have
.py or .pyw extension
"""
if name is None:
return None
try:
file, filename, _ = imp.find_module(name, path)
except ImportError:
return None
if file is None:
return filename
else:
file.close()
if os.path.splitext(filename)[1] in [".py", ".pyc"]:
return filename
else:
return None
def get_init(dirname):
"""Get __init__ file path for module directory
Parameters
----------
dirname : str
Find the __init__ file in directory `dirname`
Returns
-------
init_path : str
Path to __init__ file
"""
fbase = os.path.join(dirname, "__init__")
for ext in [".py", ".pyw"]:
fname = fbase + ext
if os.path.isfile(fname):
return fname
def find_mod(module_name):
"""Find module `module_name` on sys.path
Return the path to module `module_name`. If `module_name` refers to
a module directory then return path to __init__ file. Return full
path of module or None if module is missing or does not have .py or .pyw
extension. We are not interested in running bytecode.
Parameters
----------
module_name : str
Returns
-------
modulepath : str
Path to module `module_name`.
"""
parts = module_name.split(".")
basepath = find_module(parts[0])
for submodname in parts[1:]:
basepath = find_module(submodname, [basepath])
if basepath and os.path.isdir(basepath):
basepath = get_init(basepath)
return basepath
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