Support `-p` / `--pipfile` for deps section

[bittner]

If I'm not totally mistaken a -p / --pipfile option is not yet supported by this tox plugin. (This feature has been discussed in #37 (comment) and tox-dev/tox#417 (comment), for example.)

I'm having a hard time accepting the fact that I need to continue using requirements.txt when I have a Pipfile. Can we add this feature here to make it easier to use Tox and Pipfile together (obsoleting the need for requirements.txt, obviously)?

[bittner]

Interesting! There is a tox-pipenv-install package on PyPI, which is mentioned in the Tox docs. The implementation is almost just a code snippet. Can we re-use this? (Sorry, if that is rude!)

[tonybaloney]

hi @bittner

please could you explain what you're wanting to do, this plugin is a bit confusing between pip, pipfile, tox and virtualenv's as to who is calling whom?

If there is a Pipfile in the project, it will copy that to each venv that tox creates and use it to install/setup the virtual environment

[bittner]

I was trying to transition from the -rrequirements.txt to a -p Pipfile syntax in deps sections, e.g. when I need the production dependencies installed plus some testing tools (in the same list).