fix(init): Change Nushell init for nu 0.60

[davidkna]

Description

This PR updates the nu init for the upcoming v0.60 release. directories-next is also replaced by dirs-next again to match nushell behavior.

Motivation and Context

Closes #1716
Closes #3526

Screenshots (if appropriate):

How Has This Been Tested?

• I have tested using MacOS
• I have tested using Linux
• I have tested using Windows

Checklist:

• I have updated the documentation accordingly.
• I have updated the tests accordingly.

[davidkna]

Nushell 0.60 has been released!

[jfchevrette]

I just tried these new instructions on macOS but they do not work as the config file is read from ~/Library/Application Support/nushell/config.nu and nushell will not use ~/.config/nushell/config.nu

[jfchevrette]

It might be worth checking issue nushell/nushell#4773 which was opened for zoxide but I believe will apply to starship and the updated instructions from this PR

The TLDR is that the save would happen at "eval time" and the source would happen at "sourcing" time and that's a nu language design decision

ref.: https://www.nushell.sh/book/thinking_in_nushell.html#parsing-and-evaluation-are-different-stages

[davidkna]

@jfchevrette Thanks for the suggestions.

[Decodetalkers]

def starship_prompt [] {
    # jobs are not supported
    # status is not supported
    starship prompt --cmd-duration $env.CMD_DURATION_MS
}
let-env PROMPT_COMMAND = { (starship_prompt) }

Maybe you can try this one?

[davidkna]

@chen244 Given the high likelihood of future changes to the shell, I would rather avoid that.

[sophiajt]

@matchai - thanks for working on this fix. I made a comment about Nushell's parser/evaluator separation. For that init step, since it won't run before the source on the next line you'll need to run it as a separate step first before starting up the config.

[fdncred]

$env.LAST_EXIT_CODE is also supported in nushell now.

[sophiajt]

@davidkna - oops, I should have tagged you for ^

[davidkna]

$env.LAST_EXIT_CODE is also supported in nushell now.

This is part of the PR.