icons: partially implement home.pointerCursor to fix XCURSOR_* issues

Signed-off-by: Myned <dev@bjork.tech>

options/custom/settings/default.nix

@@ -19,6 +19,7 @@ with lib; {
       dconf.enable = true;
       fonts.enable = true;
       gtk.enable = true;
+      icons.enable = true;
       qt.enable = true;
       #// stylix.enable = true;
       xdg.enable = true;

options/custom/settings/gtk/default.nix

@@ -14,28 +14,18 @@ in {
       css = readFile ./style.css;
     in {
       enable = true;
-      gtk3.extraCss = css;
-
-      gtk4 = {
-        extraConfig.gtk-hint-font-metrics = 1; # Fix blurry fonts
-        extraCss = css;
-      };
 
       font = with config.custom.settings.fonts; {
         name = sans-serif;
         size = 12;
       };
 
-      iconTheme = {
+      cursorTheme = with config.custom.settings.icons.cursor; {
-        name = "Papirus-Dark";
+        inherit name package size;
-        package = pkgs.papirus-icon-theme;
       };
 
-      # BUG: home.pointerCursor breaks XCURSOR_PATH for some child windows, so avoid that workaround
+      iconTheme = with config.custom.settings.icons.icon; {
-      cursorTheme = {
+        inherit name package;
-        size = 24;
-        name = "GoogleDot-Black";
-        package = pkgs.google-cursor;
       };
 
       theme = {
@@ -45,6 +35,15 @@ in {
         # https://github.com/nix-community/home-manager/issues/5133
         #// package = pkgs.adw-gtk3;
       };
+
+      gtk3 = {
+        extraCss = css;
+      };
+
+      gtk4 = {
+        extraConfig.gtk-hint-font-metrics = 1; # Fix blurry fonts
+        extraCss = css;
+      };
     };
   };
 }

options/custom/settings/icons.nix

@@ -0,0 +1,55 @@
+{
+  config,
+  lib,
+  pkgs,
+  ...
+}:
+with lib; let
+  cfg = config.custom.settings.icons;
+in {
+  options.custom.settings.icons = {
+    enable = mkOption {default = false;};
+
+    cursor = {
+      # https://github.com/ful1e5/Google_Cursor
+      name = mkOption {default = "GoogleDot-Black";};
+      package = mkOption {default = pkgs.google-cursor;};
+      size = mkOption {default = 24;};
+    };
+
+    icon = {
+      # https://github.com/PapirusDevelopmentTeam/papirus-icon-theme
+      name = mkOption {default = "Papirus-Dark";};
+      package = mkOption {default = pkgs.papirus-icon-theme;};
+    };
+  };
+
+  config = mkIf cfg.enable {
+    environment.systemPackages = [cfg.cursor.package cfg.icon.package];
+
+    # BUG: home.pointerCursor breaks XCURSOR_PATH for some child windows, so avoid that workaround
+    # HACK: Copy home-manager index.theme without setting XCURSOR_* environment variables
+    home-manager.sharedModules = let
+      # https://github.com/nix-community/home-manager/blob/59a4c43e9ba6db24698c112720a58a334117de83/modules/config/home-cursor.nix#L66C3-L77C8
+      defaultIndexThemePackage = pkgs.writeTextFile {
+        name = "index.theme";
+        destination = "/share/icons/default/index.theme";
+
+        text = ''
+          [Icon Theme]
+          Name=Default
+          Comment=Default Cursor Theme
+          Inherits=${cfg.cursor.name}
+        '';
+      };
+    in [
+      {
+        # https://github.com/nix-community/home-manager/blob/59a4c43e9ba6db24698c112720a58a334117de83/modules/config/home-cursor.nix#L161
+        home.file.".icons/default/index.theme".source = "${defaultIndexThemePackage}/share/icons/default/index.theme";
+        home.file.".icons/${cfg.cursor.name}".source = "${cfg.cursor.package}/share/icons/${cfg.cursor.name}";
+        xdg.dataFile."icons/default/index.theme".source = "${defaultIndexThemePackage}/share/icons/default/index.theme";
+        xdg.dataFile."icons/${cfg.cursor.name}".source = "${cfg.cursor.package}/share/icons/${cfg.cursor.name}";
+      }
+    ];
+  };
+}