REPL shell mode is incompatible with nushell about julia

[KristofferC]

The shell> mode in the REPL doesn't actually spawn a shell, and instead evokes programs directly IIRC

I think the shell mode does spawn a shell. Perhaps you are thinking about run?

Anyway, a small tweak to

julia/base/client.jl

Lines 63 to 68 in 6023ad6

	if shell_name == "fish"
	shell_escape_cmd = "begin; $(shell_escape_posixly(cmd)); and true; end"
	else
	shell_escape_cmd = "($(shell_escape_posixly(cmd))) && true"
	end
	cmd = `$shell -c $shell_escape_cmd`

could probably fix this.

[jakobjpeters]

I also would like to use nushell. This Discourse post says that shell mode only supports POSIX shells and that one can set the JULIA_SHELL environment variable as a workaround.

[Seelengrab]

The shell> mode in the REPL doesn't actually spawn a shell, and instead evokes programs directly IIRC. How does this end up calling into nushell in the first place?

[MilesCranmer]

I’m not sure how it gets called. Maybe if JULIA_SHELL is unset it simply takes SHELL?

But where does the && come from? All that needs to be changed is that. Is that from run?

At the bottom of #23597 @xgdgsc and @stevengj were also discussing Nushell as a potential solution to having a shell mode on windows.