Respect JULIA_PROJECT environment variable if set

[schlichtanders]

I am using the python package juliacall and am surprised to find that it ignores JULIA_PROJECT environment variable.
Julia documentation about JULIA_PROJECT.

It would be great if this standard variable is respected. Currently juliacall opens a new julia environment pyjuliapkg

[schlichtanders]

It seems related to https://github.com/JuliaPy/PyJuliaPkg in that a workaround could be to set PYTHON_JULIAPKG_PROJECT

EDIT: This is not working because of this related bug JuliaPy/pyjuliapkg#15 - PyJuliaPkg will simply delete the entire project folder. There is no workaround for this behaviour currently.

[schlichtanders]

It seems there is not a single workaround to start JuliaCall in a predefined environment.
Respecting the environment variable JULIA_PROJECT could be a good way to add this feature.

[schlichtanders]

PythonCall already sets up a pseudo juliacall package when plainly run from julia.

Maybe this already existing mechanism could be reused to start juliacall in an existing environment.

[cjdoris]

Ignoring JULIA_PROJECT is intended. You can set PYTHON_JULIAPKG_PROJECT and PYTHON_JULIAPKG_OFFLINE=yes to get the behaviour you want, I think?

[schlichtanders]

Thank you for reminding me that both variables need to be set. For me, coming from julia, it is very unintuitive to set two environment variables in order to get an Julia environment to work.

My tests where successful, it worked. Thank you.

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What about translating the JULIA_PROJECT environment variable automatically to those two PYTHON_JULIAPKG environment variables?