feature(theme): replace all color theme configs with stylix

modules/home-manager/ghostty.nix

@@ -4,13 +4,10 @@
     settings = {
       clipboard-paste-protection = false;
       clipboard-read = "allow";
-      font-family = "0xProto Nerd Font Mono";
-      font-size = 12;
       gtk-titlebar = false;
       scrollback-limit = 100000;
       shell-integration = "zsh";
       shell-integration-features = "ssh-env,ssh-terminfo";
-      theme = "noctalia"; # generated by noctalia-shell
       window-decoration = "auto";
       window-padding-x = 10;
       window-padding-y = 10;

modules/home-manager/niri.nix

@@ -2,7 +2,12 @@
 # come from modules/nixos/niri.nix. Outputs and input devices that differ
 # per machine live in hosts/<host>/niri.nix.
 
-{ lib, osConfig, ... }:
+{
+  config,
+  lib,
+  osConfig,
+  ...
+}:
 
 let
   # Mod+1..9 focus a workspace, Mod+Ctrl+1..9 move the column there
@@ -18,6 +23,9 @@ let
     _props.allow-when-locked = true;
     spawn-sh = cmd;
   };
+
+  # niri has no stylix target, so the colors are picked here
+  colors = config.lib.stylix.colors.withHashtag;
 in
 {
   wayland.windowManager.niri = {
@@ -61,9 +69,9 @@ in
         focus-ring = {
           on = { };
           width = 2;
-          active-color = "#4c566a";
-          inactive-color = "#2e3440";
-          urgent-color = "#a3be8c";
+          active-color = colors.base03;
+          inactive-color = colors.base00;
+          urgent-color = colors.base0B;
         };
 
         border.off = { };

modules/home-manager/nixvim.nix

@@ -23,9 +23,6 @@
 
     # nvim mapleader for all command below
     globals.mapleader = " ";
-    # set colorscheme to nord
-    colorschemes.nord.enable = true;
-
     # nvim plugins
     plugins.indent-blankline.enable = true;
     plugins.lualine.enable = true;

modules/home-manager/noctalia.nix

@@ -14,13 +14,7 @@
 
     # settings is rendered to ~/.config/noctalia/config.toml
     settings = {
-      # theme / colors
-      theme = {
-        source = "builtin";
-        builtin = "Nord";
-        mode = "dark";
-        templates.builtin_ids = [ "ghostty" ];
-      };
+      # theme / colors come from stylix, see stylix.nix
 
       # general
       shell = {

modules/home-manager/styling.nix

@@ -1,23 +0,0 @@
-{ pkgs, ... }:
-
-{
-  gtk = {
-    enable = true;
-    theme = {
-      name = "Adwaita-dark";
-      package = pkgs.gnome-themes-extra;
-    };
-    gtk3.extraConfig.gtk-application-prefer-dark-theme = 1;
-    gtk4.theme = null;
-    gtk4.extraConfig.gtk-application-prefer-dark-theme = 1;
-  };
-
-  qt = {
-    enable = true;
-    platformTheme.name = "qt6";
-    style = {
-      name = "adwaita-dark";
-      package = pkgs.adwaita-qt;
-    };
-  };
-}

modules/home-manager/stylix.nix

@@ -0,0 +1,36 @@
+# One Nord palette for everything stylix has a target for: gtk, qt,
+# noctalia, ghostty, nixvim. niri has no target and reads the colors in
+# niri.nix. Only the home-manager module is used, so boot, console and
+# sddm are left alone.
+
+{ pkgs, ... }:
+
+{
+  stylix = {
+    enable = true;
+    base16Scheme = "${pkgs.base16-schemes}/share/themes/nord.yaml";
+    polarity = "dark";
+
+    fonts = {
+      monospace = {
+        name = "0xProto Nerd Font Mono";
+        package = pkgs.nerd-fonts._0xproto;
+      };
+      sizes.terminal = 12;
+    };
+
+    # its overlays (nixos-icons, gtksourceview) clash with useGlobalPkgs
+    overlays.enable = false;
+
+    targets = {
+      # profiles aren't managed by home-manager, declaring one here would
+      # take over the existing profile
+      firefox.enable = false;
+      # the bar keeps 0xProto instead of the sans-serif font
+      noctalia.fonts.enable = false;
+      # the hand-built status line in tmux.nix uses ANSI color names, which
+      # already follow the terminal palette
+      tmux.enable = false;
+    };
+  };
+}