REPL: allow attaching a module other than Main

[StefanKarpinski]

It would be very convenient to be able to eval code in the context of a different module than Main. This could be reflected by the prompt output or be a separate REPL mode or something. The implementation is probably largely just a matter of making references to Main in the REPL code use a global instead that is set to Main initially but can be changed.

[tshort]

Here's a quick hack at a REPL mode that does this.

https://github.com/tshort/REPLinModule.jl

An advantage of a REPL mode is that you can easily switch between Main and another module.

[StefanKarpinski]

Very cool! Serves as an excellent prototype for this feature.

[KristofferC]

There is a difference in case between the repo name and the file name of the module which makes it fail to load on case sensitive systems.

[tshort]

Thanks, @KristofferC. Hopefully fixed.

[ZacLN]

If this were integrated into base it would be nice to hook the active module up to this so that completions worked as expected

[tkelman]

@ZacLN hit y for a permalink when you link to lines of code, otherwise master will change around and the link might no longer be relevant - I think you meant

julia/base/repl/REPLCompletions.jl

Line 23 in ff706aa

context_module = Main

?

[NightMachinery]

Any updates? VSCode's Julia extension has this feature, and I like to add it to emacs.

[KristofferC]

#33872 is the latest on it I think.

[rfourquet]

Closed by #33872.