created tox shorthand for building and uploading packages to pypi (#67)

docs/maintaining.rst

@@ -196,13 +196,9 @@ Uploading to PyPI
 Once you've tagged the latest version of marbles, pull from GitHub to
 make sure your clone is up to date and clean, build both ``sdist`` and
 ``wheel`` packages for all three packages, and upload them with
-`twine`_::
+`twine`_. We have a `tox`_ rule to automate building and uploading::
 
-    $ rm -rf dist marbles/{core,mixins}/dist
-    $ (cd marbles/core; python setup.py sdist bdist_wheel)
-    $ (cd marbles/mixins; python setup.py sdist bdist_wheel)
-    $ python setup.py sdist bdist_wheel
-    $ twine upload dist/* marbles/{core,mixins}/dist/*
+    $ tox -e pypi
 
 .. _pipenv: https://docs.pipenv.org
 .. _flake8: http://flake8.pycqa.org

tox.ini

@@ -37,4 +37,16 @@ commands=
 basepython = python3.6
 commands=
     pipenv install --dev
-    pipenv run python setup.py build_sphinx -Ea
+    pipenv run python setup.py build_sphinx -Ea
+
+[testenv:pypi]
+basepython = python3.6
+whitelist_externals=
+    bash
+commands=
+    pipenv install --dev
+    rm -rf dist marbles/core/dist marbles/mixins/dist
+    pipenv run bash -c "cd marbles/core; python setup.py sdist bdist_wheel"
+    pipenv run bash -c "cd marbles/mixins; python setup.py sdist bdist_wheel"
+    pipenv run python setup.py sdist bdist_wheel
+    twine upload --repository-url=https://upload.pypi.org/legacy/ dist/* marbles/core/dist/* marbles/mixins/dist/*