emacs: Add yasnippets to rust company completions.

pkgs/pkgsets/emacs/company.nix

@@ -100,7 +100,9 @@ in mkIf (elem "emacs::company" config.machine.pkgs) {
     company = {
       enable = true;
       diminish = [ "company-mode" ];
-      hook = [ "(after-init . global-company-mode)" ];
+      hook = [ "(after-init . global-company-mode)" ]
+             ++ optional (elem "emacs::rust" config.machine.pkgs)
+               ''(rust-mode . (lambda () (setq company-backends '((company-capf :with company-yasnippet)))))'';
       bind = { "\t" = "'company-complete-common"; };
       init = ''(require 'ffap)'';
       config = ''
@@ -119,6 +121,7 @@ in mkIf (elem "emacs::company" config.machine.pkgs) {
                     ([remap complete-symbol] . company-complete-common))
       '';
     };
+
     company-box = {
       enable = true;
       hook = [ "(company-mode . (lambda () (company-box-mode)))" ];

pkgs/pkgsets/emacs/lsp.nix

@@ -15,6 +15,9 @@ mkIf (elem "emacs::lsp" config.machine.pkgs) {
           ${optionalString (elem "emacs::rust" config.machine.pkgs)
             ''(rust-mode . "rust")''}
         ))
+        ${optionalString (elem "emacs::rust" config.machine.pkgs) ''
+          (setq lsp-rust-clippy-preference "on")
+        ''}
       '';
     };
 

pkgs/pkgsets/emacs/yasnippet.nix

@@ -0,0 +1,18 @@
+{ config, lib, pkgs, ... }:
+
+with lib;
+
+mkIf (elem "emacs::yasnippet" config.machine.pkgs) {
+  programs.emacs.init.usePackage = {
+    yasnippet = {
+      enable = true;
+      hook = [ "(after-init . yas-global-mode)" ];
+      # config = ''
+
+      # '';
+    };
+    yasnippet-snippets = {
+      enable = true;
+    };
+  };
+}