home/nil: Switch shell to Nushell

home/config/nil/home.nix

@@ -30,12 +30,6 @@ in {
   home.stateVersion = "24.11";
   home.enableNixpkgsReleaseCheck = false;
 
-  home.activation = {
-    fish = lib.hm.dag.entryAfter ["writeBoundary"] ''
-      run ${lib.getExe config.programs.fish.package} -c 'set -U fish_greeting'
-    '';
-  };
-
   home.packages = with pkgs; [
     # Terminfo
     kitty.terminfo
@@ -306,6 +300,51 @@ in {
     '';
   };
 
+  programs.nushell = {
+    enable = true;
+    envFile.text = ''
+      load-env {
+        PROMPT_COMMAND: {
+          let dir = match (do --ignore-shell-errors { $env.PWD | path relative-to $nu.home-path }) {
+            null => $env.PWD
+            "" => '~'
+            $relative_pwd => ([~ $relative_pwd] | path join)
+          }
+
+          [
+            (if (is-admin) { ansi red_bold } else { ansi green_bold })
+            (sys host | get hostname)
+            (char space)
+            (ansi blue_bold)
+            ($dir | path split | last)
+            (ansi reset)
+            (char space)
+          ] | str join
+        }
+
+        PROMPT_COMMAND_RIGHT: {
+          let duration = $env.CMD_DURATION_MS | into int
+
+          if $duration >= 2000 {
+            [ (ansi light_red) ($duration | into duration --unit ms) ] | str join
+          }
+        }
+
+        PROMPT_INDICATOR: { "› " }
+
+        SSH_AUTH_SOCK: $"($env.XDG_RUNTIME_DIR)/ssh-agent"
+        TMPDIR: $"($env.XDG_RUNTIME_DIR)/tmp"
+      }
+    '';
+
+    configFile.text = ''
+      $env.config = {
+        show_banner: false
+        use_kitty_protocol: true
+      };
+    '';
+  };
+
   services.ssh-agent.enable = true;
 
   systemd.user.tmpfiles.rules = [

nixos/module/users.nix

@@ -14,7 +14,6 @@ in {
     (pkg: builtins.elem (lib.getName pkg) [ "obsidian" ]);
 
   programs.dconf.enable = lib.mkIf graphical true;
-  programs.fish.enable = true;
 
   services.udev.packages = [
     (pkgs.writeTextDir "/etc/udev/rules.d/98-user-power-supply.rules" ''
@@ -48,7 +47,7 @@ in {
 
   users.users.nil = {
     isNormalUser = true;
-    shell = config.programs.fish.package;
+    shell = pkgs.nushell;
     extraGroups = [ "wheel" ];
     openssh.authorizedKeys.keys = [
       "sk-ssh-ed25519@openssh.com AAAAGnNrLXNzaC1lZDI1NTE5QG9wZW5zc2guY29tAAAAICczPHRwY9MAwDGlcB0QgMOJjcpLJhVU3covrW9RBS62AAAABHNzaDo= primary"