nixos/pkgsets/emacs/rust.nix

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{ config, lib, pkgs, ... }:
with lib;
let
rustEnv = pkgs.symlinkJoin {
name = "rustEnv";
paths = config.machine.pkgsets.rustpkgs.pkgwrap;
};
in mkIf (elem "emacs::rust" config.machine.pkgs) {
programs.emacs.init.usePackage.rust-mode = {
enable = true;
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hook = [ ''(rust-mode . (lambda () (cargo-minor-mode)))'' ]
++ (if (elem "emacs::lsp" config.machine.pkgs)
then [''(rust-mode . (lambda () (lsp)))'']
else [''(rust-mode . (lambda () (racer-mode)))'']);
mode = [ ''("\\.rs\\'" . rust-mode)'' ];
command = [ "rust-mode" ];
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bindLocal = optionalAttrs (elem "emacs::company" config.machine.pkgs) { rust-mode-map = {
"<tab>" = "company-indent-or-complete-common";
};};
config = ''
(setq rust-rustfmt-bin "${rustEnv}/bin/rustfmt")
(setq rust-format-on-save t)
'';
};
programs.emacs.init.usePackage.cargo = {
enable = true;
defer = true;
};
programs.emacs.init.usePackage.racer = {
enable = true;
defer = true;
hook = [
''(racer-mode . (lambda () (eldoc-mode)))''
] ++ optional (elem "emacs::company" config.machine.pkgs) ''(racer-mode . (lambda () (company-mode)))'';
config = ''
(setq racer-rust-src-path "${rustEnv}/lib/rustlib/src/rust/src")
(setq racer-cmd "${rustEnv}/bin/racer")
'';
};
}