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Commit 9c61f254 authored by Kirill Smelkov's avatar Kirill Smelkov
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pygopath: Initial draft 

Module gopath provides way to import python modules by full path in a Go workspace.

For example

    lonet = gopath.gimport('lab.nexedi.com/kirr/go123/xnet/lonet')

will import either

    lab.nexedi.com/kirr/go123/xnet/lonet.py, or
    lab.nexedi.com/kirr/go123/xnet/lonet/__init__.py

located somewhere under $GOPATH.
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*.py[co]
__pycache__
build/
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*.o
*.so
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*.egg-info
perf.data*
core
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Pygopath is free software licensed under GPLv3+ with additional permission
to link, combine and redistribute it with other free or open source software.
Please see https://www.nexedi.com/licensing for rationale and options.
The exact licensing terms follow:
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along with this program. If not, see <http://www.gnu.org/licenses/>.
Also add information on how to contact you by electronic and paper mail.
If the program does terminal interaction, make it output a short
notice like this when it starts in an interactive mode:
<program> Copyright (C) <year> <name of author>
This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
This is free software, and you are welcome to redistribute it
under certain conditions; type `show c' for details.
The hypothetical commands `show w' and `show c' should show the appropriate
parts of the General Public License. Of course, your program's commands
might be different; for a GUI interface, you would use an "about box".
You should also get your employer (if you work as a programmer) or school,
if any, to sign a "copyright disclaimer" for the program, if necessary.
For more information on this, and how to apply and follow the GNU GPL, see
<http://www.gnu.org/licenses/>.
The GNU General Public License does not permit incorporating your program
into proprietary programs. If your program is a subroutine library, you
may consider it more useful to permit linking proprietary applications with
the library. If this is what you want to do, use the GNU Lesser General
Public License instead of this License. But first, please read
<http://www.gnu.org/philosophy/why-not-lgpl.html>.
MANIFEST.in 0 → 100644
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recursive-include testdata *.py
README.rst 0 → 100644
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=================================================================
Pygopath - Import python modules by full path in a Go workspace
=================================================================
Module `gopath` provides way to import python modules by full path in a Go workspace.
For example
::
lonet = gopath.gimport('lab.nexedi.com/kirr/go123/xnet/lonet')
will import either
- `lab.nexedi.com/kirr/go123/xnet/lonet.py`, or
- `lab.nexedi.com/kirr/go123/xnet/lonet/__init__.py`
located in `src/` under `$GOPATH`.
gopath.py 0 → 100644
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# Copyright (C) 2018 Nexedi SA and Contributors.
# Kirill Smelkov <kirr@nexedi.com>
#
# This program is free software: you can Use, Study, Modify and Redistribute
# it under the terms of the GNU General Public License version 3, or (at your
# option) any later version, as published by the Free Software Foundation.
#
# You can also Link and Combine this program with other software covered by
# the terms of any of the Free Software licenses or any of the Open Source
# Initiative approved licenses and Convey the resulting work. Corresponding
# source of such a combination shall include the source code for all other
# software used.
#
# This program is distributed WITHOUT ANY WARRANTY; without even the implied
# warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
#
# See COPYING file for full licensing terms.
# See https://www.nexedi.com/licensing for rationale and options.
"""Module gopath provides way to import python modules by full path in a Go workspace.
For example
lonet = gopath.gimport('lab.nexedi.com/kirr/go123/xnet/lonet')
will import either
lab.nexedi.com/kirr/go123/xnet/lonet.py, or
lab.nexedi.com/kirr/go123/xnet/lonet/__init__.py
located in src/ under $GOPATH.
"""
import os, os.path
import sys
import imp
# _gopathv returns $GOPATH vector.
def _gopathv():
gopath = os.environ.get('GOPATH')
if gopath is None:
# since Go1.8 default GOPATH is ~/go
gopath = os.path.expanduser(os.path.join('~', 'go'))
return gopath.split(os.path.pathsep)
# gimport imports python module or package from fully-qualified module name under $GOPATH.
def gimport(name):
imp.acquire_lock()
try:
return _gimport(name)
finally:
imp.release_lock()
def _gimport(name):
# we will register imported module into sys.modules with adjusted path.
# reason: if we leave dots in place, python emits warning:
# RuntimeWarning: Parent module 'lab.nexedi' not found while handling absolute import
#
# we put every imported module under `gopath.` namespace with '.' changed to '_'
modname = 'gopath.' + name.replace('.', '_')
try:
return sys.modules[modname]
except KeyError:
# not yet imported
pass
# search for module in every GOPATH entry
modpath = None
gopathv = _gopathv()
for g in gopathv:
# module: .../name.py
modpath = os.path.join(g, 'src', name + '.py')
if os.path.exists(modpath):
break
# package: .../name/__init__.py
modpath = os.path.join(g, 'src', name, '__init__.py')
if os.path.exists(modpath):
break
else:
modpath = None
if modpath is None:
raise ImportError('gopath: no module named %s' % name)
# https://stackoverflow.com/a/67692
# TODO py3 support
return imp.load_source(modname, modpath)
gopath_test.py 0 → 100644
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# Copyright (C) 2018 Nexedi SA and Contributors.
# Kirill Smelkov <kirr@nexedi.com>
#
# This program is free software: you can Use, Study, Modify and Redistribute
# it under the terms of the GNU General Public License version 3, or (at your
# option) any later version, as published by the Free Software Foundation.
#
# You can also Link and Combine this program with other software covered by
# the terms of any of the Free Software licenses or any of the Open Source
# Initiative approved licenses and Convey the resulting work. Corresponding
# source of such a combination shall include the source code for all other
# software used.
#
# This program is distributed WITHOUT ANY WARRANTY; without even the implied
# warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
#
# See COPYING file for full licensing terms.
# See https://www.nexedi.com/licensing for rationale and options.
import os, os.path
from gopath import gimport
GOPATH_orig = None
def setup_module():
# set GOPATH to testdata/src
global GOPATH_orig
GOPATH_orig = os.environ.get('GOPATH')
os.environ['GOPATH'] = '%s/testdata' % (os.path.dirname(__file__),)
def teardown_module():
if GOPATH_orig is None:
del os.environ['GOPATH']
else:
os.environ['GOPATH'] = GOPATH_orig
def test_import_module():
hello = gimport('lab.nexedi.com/kirr/hello')
assert hello.TAG == 'gopath: test: hello.py'
hello.TAG = 'loaded'
# verify second gimport does not reload
hello2 = gimport('lab.nexedi.com/kirr/hello')
assert hello2 is hello
# even though hello2 is hello - the module could be reloaded.
# check it is not the case via .TAG .
assert hello.TAG == 'loaded', 'module was reloaded'
def test_import_package():
world = gimport('lab.nexedi.com/kirr/world')
assert world.TAG == 'gopath: test: world/__init__.py'
world.TAG = 'loaded'
# verify second gimport does not reload
world2 = gimport('lab.nexedi.com/kirr/world')
assert world2 is world
# even though world2 is world - the module could be reloaded.
# check it is not the case via .TAG .
assert world.TAG =='loaded', 'module was reloaded'
setup.py 0 → 100644
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# pygopath | pythonic package setup
from setuptools import setup, find_packages
# read file content
def readfile(path):
with open(path, 'r') as f:
return f.read()
setup(
name = 'pygopath',
version = '0.0.0.dev1',
description = 'Import python modules by full-path in Go workspace',
long_description = readfile('README.rst'),
url = 'https://lab.nexedi.com/kirr/pygopath',
license = 'GPLv3+ with wide exception for Open-Source',
author = 'Kirill Smelkov',
author_email= 'kirr@nexedi.com',
keywords = 'go GOPATH python import',
# XXX find_packages does not find top-level *.py
#packages = find_packages(),
packages = [''],
extras_require = {
'test': ['pytest'],
},
classifiers = [_.strip() for _ in """\
Development Status :: 3 - Alpha
Intended Audience :: Developers\
""".splitlines()]
)
testdata/src/lab.nexedi.com/kirr/hello.py 0 → 100644
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TAG = 'gopath: test: hello.py'
testdata/src/lab.nexedi.com/kirr/world/__init__.py 0 → 100644
View file @ 9c61f254
TAG = 'gopath: test: world/__init__.py'
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