To implement the setup process like Python does ?

[litlighilit]

A few months ago,
when I was about to implement sys.getfilesystemencoding(),
I didn't think it would be quite hard.

However, sys.getfilesystemencoding() has cuased me to devote quite a lot of efforts to inspect sysmodule.c, then pyreconfig.c, pyconfig.c, pylifecycle.c,...

I gradually found it's sys module that in fact requires the infomation from the whole Python's setup process, which, includes: read config, get env, setup interpreter, etc. Hard to enumerate, quite a few!

Half in this way, I've decided even though the whole sys module is implemented in pylib,
it shall be optional, and even disabled by default and only opened if a compile flag is given.

Back to it, I'm thinking whether it meaningful or how much it meaningful for a Nim program to reading configure like Python does. e.g. optionally let PYTHONIOENCODING influenues program of pylib.

[litlighilit]

In fact in amount of code, it can be said I've finished about 90 percent,

but I think the code really requires hard tests, so it's quite a long way to really implement it.

[litlighilit]

Also, I'm currently working on branch encoding, which introduces codecs field to interpreter configure object (in CPython),

which also means enlarging the runtime of pylib