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/system/home/modules/lib/zshFunctions.nix

@@ -0,0 +1,23 @@
+{ config, lib, pkgs, ... }:
+
+with lib;
+
+{
+  options = {
+    programs.zsh.functions = mkOption {
+      description = "An attribute set that maps function names to their source";
+      default = { };
+      type = with types; attrsOf (either str path);
+    };
+  };
+
+  config.programs.zsh.initExtra = concatStringsSep "\n" (
+    mapAttrsToList
+      (name: funSrc: ''
+        function ${name}() {
+          ${funSrc}
+        }
+      '')
+      config.programs.zsh.functions
+  );
+}