chore(users): grfn -> aspen

Change-Id: I6c6847fac56f0a9a1a2209792e00a3aec5e672b9
Reviewed-on: https://cl.tvl.fyi/c/depot/+/10809
Autosubmit: aspen <root@gws.fyi>
Reviewed-by: sterni <sternenseemann@systemli.org>
Tested-by: BuildkiteCI
Reviewed-by: lukegb <lukegb@tvl.fyi>

users/aspen/emacs.d/nix.el

@@ -0,0 +1,30 @@
+;;; -*- lexical-binding: t; -*-
+
+(defun nix-buffer-type ()
+  "Returns:
+
+'home-manager, if the current buffer is a home-manager module
+'nixos, if the current buffer is a nixos module
+nil, if none of the above are the case"
+  (when buffer-file-name
+    (pcase buffer-file-name
+      ((rx (0+ nonl) "system/home" (0+ nonl) ".nix" eos)
+       'home-manager)
+      ((rx (0+ nonl) "system/system" (0+ nonl) ".nix" eos)
+       'nixos))))
+
+(defun set-nix-compile-command ()
+  "Set the compile command for the current buffer based on the type of nix
+buffer it is, per `nix-buffer-type'"
+  (interactive)
+  (when-let ((btype (nix-buffer-type)))
+    (setq-local
+     compile-command
+     (case btype
+       ('home-manager "home-manager switch")
+       ('nixos "sudo nixos-rebuild switch")))))
+
+(add-hook 'nix-mode-hook #'set-nix-compile-command)
+
+(map! (:map nix-mode-map
+       (:n "g SPC" #'compile)))