Fancier rust shells

[jneem]

Organist's rust shell uses the rust toolchain from nixpkgs, which is usually fine but lacks a few options. In particular, I often want to

• use nightly,
• add cross-compilation targets,
• add extra components (usually miri, but sometimes also rust-src)

All these options (and more) are supported by nix-community/fenix, so maybe a nice organist interface could be built on top of that?

I had a quick stab at it and got something working, which I will add as an attachment. It requires modifying the template's flake.nix to pass the fenix input like

    organist.flake.outputsFromNickel ./. (inputs // { fenix = inputs.fenix.packages.${system}; }) {};

because I couldn't figure out how else to thread the system through...

project.ncl.txt

[thufschmitt]

Nice, thanks!

I'll look at how this can be upstreamed.

Some quick thoughts:

• You shouldn't need the { fenix = inputs.fenix.packages.${system}; } trick in the Flake because import_nix implicitly tries adding packages.${system} to the attribute path you pass to it. It's a bug if that doesn't work

• Maybe the components arrays could be replaced by a record of booleans, something like:

    enabledComponents | "Components to install" = {
      rustc | bool | default = true,
      cargo | bool | default = true,
      rust-std | bool | default = true,
      rustfmt | bool | default = false,
      rust-docs | bool | default = false,
      rust-analyzer | bool | default = false,
      clippy | bool | default = false,
      miri | bool | default = false,
      rust-src | bool | default = false,
    }

  That's a bit more verbose, but plays nicer with the merge semantics.

[jneem]

You shouldn't need the { fenix = inputs.fenix.packages.${system}; } trick in the Flake

Indeed I don't, thanks! I was so convinced that threading through the system was going to be annoying that I didn't think to check whether it worked without it...

Maybe the components arrays could be replaced by a record of booleans

Yes, that works nicely. I even did the same to extraTargets, which is nice with autocomplete because the target names are long. I put the result here, since there are now a few files involved.

[thufschmitt]

Fixed by #180