Make date to be part of the index url

[yarikoptic]

I am here in a follow up to ReproNim/repropip#1 and I think pypi-timemachine is exactly what I need besides one "wishlist" aspect: be able to specify date not while starting up the pypi-timemachine but rather in the index-url, e.g.

 pip install --index-url http://127.0.0.1:5000/2014-02-03T12:33:02/ astropy

thus making it possible to reuse the same server for various dates, similarly to how https://snapshot.debian.org/ works. Do you think it is possible to implement or would be prohibitively expensive. (I haven't checked yet how pypi-timemachine functions, decided to just ask first... socializing you know ;-) )

[asmacdo]

It also seems reasonable to accept cutoff date time as a query param, which wouldn't require a new endpoint?

nevermind, this request is coming from pip

[nevakrien]

I made a version that does that I can try adding that in but it's probably our of scope for this project

[yarikoptic]

@nevakrien why do you think it is out of scope? may be @astrofrog would love it ;)