feat(themes): declaratively manage icons, cursors, and dark/light modes

- Automatically detect light mode via 'light.mode' file in theme folder
- Read icon theme name from 'icons.theme' file in theme folder
- Switch Stylix polarity and iconTheme based on theme selection
- Add yaru-theme and bibata-cursors to default packages
- Remove obsolete imperative nomarchy-theme-set-gnome script

bin/nomarchy-theme-set-gnome

@@ -1,18 +0,0 @@
-#!/bin/bash
-
-# Change gnome modes
-if [[ -f ~/.config/nomarchy/current/theme/light.mode ]]; then
-  gsettings set org.gnome.desktop.interface color-scheme "prefer-light"
-  gsettings set org.gnome.desktop.interface gtk-theme "Adwaita"
-else
-  gsettings set org.gnome.desktop.interface color-scheme "prefer-dark"
-  gsettings set org.gnome.desktop.interface gtk-theme "Adwaita-dark"
-fi
-
-# Change gnome icon theme color
-GNOME_ICONS_THEME=~/.config/nomarchy/current/theme/icons.theme
-if [[ -f $GNOME_ICONS_THEME ]]; then
-  gsettings set org.gnome.desktop.interface icon-theme "$(<$GNOME_ICONS_THEME)"
-else
-  gsettings set org.gnome.desktop.interface icon-theme "Yaru-blue"
-fi

modules/home/default.nix

@@ -49,6 +49,8 @@ in
     mise
     jq
     xmlstarlet
+    yaru-theme
+    bibata-cursors
     nerd-fonts.jetbrains-mono
     nerd-fonts.roboto-mono
     nerd-fonts.fira-code

modules/home/options.nix

@@ -1,4 +1,4 @@
-{ lib, ... }:
+{ lib, pkgs, ... }:
 
 {
   options.nomarchy = {
@@ -73,6 +73,28 @@
         description = "System monospace font.";
       };
     };
+    iconsTheme = lib.mkOption {
+      type = lib.types.str;
+      default = "Yaru-blue";
+      description = "System icon theme name.";
+    };
+    isLightMode = lib.mkOption {
+      type = lib.types.bool;
+      default = false;
+      description = "Whether the current theme is light mode.";
+    };
+    cursor = {
+      name = lib.mkOption {
+        type = lib.types.str;
+        default = "Bibata-Modern-Ice";
+        description = "Mouse cursor theme name.";
+      };
+      package = lib.mkOption {
+        type = lib.types.package;
+        default = pkgs.bibata-cursors;
+        description = "Package providing the cursor theme.";
+      };
+    };
     configOverrides = lib.mkOption {
       type = lib.types.nullOr lib.types.path;
       default = null;

modules/home/state.nix

@@ -117,6 +117,15 @@ in
         border_size = togglesState.hyprland.border_size or 2;
       };
       fonts.monospace = togglesState.font or "JetBrainsMono Nerd Font";
+      
+      # Derived properties from the theme directory
+      isLightMode = builtins.pathExists (../../themes + "/${togglesState.theme or "nord"}/light.mode");
+      iconsTheme = let
+        iconsFile = ../../themes + "/${togglesState.theme or "nord"}/icons.theme";
+      in
+        if builtins.pathExists iconsFile 
+        then lib.removeSuffix "\n" (builtins.readFile iconsFile)
+        else "Yaru-blue";
     };
   };
 }

modules/home/stylix.nix

@@ -21,12 +21,12 @@ in
     image = activeWallpaper;
     base16Scheme = currentPalette;
     
-    # Force dark/light mode based on theme name if possible, or just default to dark
-    polarity = if lib.strings.hasInfix "light" activeThemeName then "light" else "dark";
+    # Use detected light mode state
+    polarity = if config.nomarchy.isLightMode then "light" else "dark";
 
     cursor = {
-      package = pkgs.bibata-cursors;
-      name = "Bibata-Modern-Ice";
+      package = config.nomarchy.cursor.package;
+      name = config.nomarchy.cursor.name;
       size = 24;
     };
 
@@ -65,4 +65,13 @@ in
       gnome.enable = true;
     };
   };
+
+  # GTK Icon Theme configuration
+  gtk = {
+    enable = true;
+    iconTheme = {
+      package = pkgs.yaru-theme;
+      name = config.nomarchy.iconsTheme;
+    };
+  };
 }