Allow installing extra packages into an existing installed package.

[schinckel]

I think this mostly resolves the issues detailed below, which are all variations on the same theme:

Resolves #31, #29, #13.

This creates an extra command install_into, that takes two arguments - the existing package, and the new module that should be installed into that package.

For instance:

pipsi install_into tox detox

It should be possible to also use the same philosophy to do:

pipsi install detox --into tox

But I haven't implemented this yet. Interested to hear which approach is preferred.

[RonnyPfannschmidt]

in my oppinion the second form should be preferred

i also think there should be a json/text file remembering
the explicitly requested packages for upgrades/recreation of envs and script re-linking

[schinckel]

Hmm. We already have a mechanism for storing sets of requirements for installing with pip. Perhaps after installing, pipsi could do a pip freeze > somewhere. But where to store these files?

Or were you thinking a single file for all installed venvs?

[RonnyPfannschmidt]

pip freeze cannot possibly solve the issue wrt updates and remembering which scripts to link

also it should be possible to install packages without scripts without fail (think of plugins for a tool that has a script)

json files either inside each the virtualenv or inside the pipsi home are fine

[RonnyPfannschmidt]

Closing since it's a dead end