black: remove resources declarations

[chenrui333]

Remove resource declarations for the formula (would be easier for bump the version in the future)

[SMillerDev]

Do we have a lockfile from upstream verifying hashes with strictly pinned versions?

[chenrui333]

@SMillerDev They have piplock file
https://github.com/psf/black/blob/master/Pipfile.lock

[SMillerDev]

That isn't used in the implementation you're proposing though. So ever install would potentially be different.

[Moisan]

I spent a moment trying to get pipenv and piplock to work with this formula. It doesn't work so far but here is my best attempt:

    ENV["WORKON_HOME"] = libexec
    system "pipenv", "install", "--ignore-pipfile"

--ignore-pipfile forces to use the piplock file.
pipenv doesn't have an option (yet) to build the in a precise directory its virtual environment. The nearest thing is WORKON_HOME which is the directory in which it will create a folder named by using a hash unknown before execution. We can find back the location of the environment with

pyenv shell
pyenv --where

I was hoping that once we get the exact location of the virtualenv, we could do something like bin.install_symlink "#{libexec}/#{the_venv_folder}/bin/black" => "black" to symlink the binary like we usually do.

[Moisan]

Tried again but couldn't get it to work, anyone else is welcome to give it a try.

[chenrui333]

With this recipe repo as rescue, I am good for closing the PR now. :)
https://github.com/dawidd6/homebrew-update-pypi-resources

Thanks @Moisan for your efforts, really appreciate it!!