Support shared named environments during startup

[oschulz]

Implements #35354 .

I hope I did this right - from what I saw, most things @fredrikekre had in his proposed patch in #35354, load_path_expand() does already now. So just using load_path_expand() instead of expanduser() in init_active_project() seems to do the trick. I'm not an expert on Julia's init process, though.

WIth this, both --project=@myenv and JULIA_PROJECT=@myenv seem to behave the same way as activate @myenv on the Pkg console.

[oschulz]

Ah, not quite that simple it seems (see failed tests), fixing that now.

[oschulz]

Got tests to pass - @vtjnash , are the additional tests sufficient (sorry if I got the wrong guy, GitHub suggested you as reviewer)?

[fredrikekre]

This doesn't work on Windows? I see no reason it shouldn't, and in that case the new tests should be moved out from the if.

[oschulz]

Good point - why are the previous test cases in if !Sys.iswindows(), though?

[fredrikekre]

Because they test expansion of ~.

[oschulz]

Ahh, silly me. Ok, I'll move it out.

[oschulz]

Ok, tests are much nicer now.

[oschulz]

Question: load_path_expand(project) returns the full project path including "/Project.toml" and expanduser(project) just returns the directory. Is that Ok (same mixed behavior as before) or should we harmonize this so that init_active_project() always returns the project with or without "/Project.toml" at the end?

[oschulz]

@vtjnash , is this good to merge as is, for you?

[fredrikekre]

LGTM, but might be news-worthy?

[oschulz]

Good point - under "Command-line option changes", I guess?

[oschulz]

I added a news item - text Ok like that?

[musm]

@oschulz Was the force-push just a documentation change? I want to confirm I can merge this if any code-changes were made after the approvals.

[oschulz]

@oschulz Was the force-push just a documentation change?

Oh, sorry - just wanted to present a cleaner history. No, the force push included improvements to the tests that I added after @fredrikekre 's initial approval (since he suggested to also test on Windows).

[oschulz]

Thanks!

[oschulz]

I should have done this a few weeks earlier, in time for v1.6. :-)

[musm]

That gives you a reason to look forward to 1.7 😉

[oschulz]

;-)