Add nixGL for firefox, digikam

nixGL.nix

@@ -0,0 +1,34 @@
+# Call once on import to load global context
+{ pkgs, config }:
+
+let nixGL = import <nixgl> {}; in
+
+# Wrap a single package
+pkg:
+
+# Wrap the package's binaries with nixGL, while preserving the rest of
+# the outputs and derivation attributes.
+  (pkg.overrideAttrs (old: {
+    name = "nixGL-${pkg.name}";
+    buildCommand = ''
+      set -eo pipefail
+
+      ${
+      # Heavily inspired by https://stackoverflow.com/a/68523368/6259505
+      pkgs.lib.concatStringsSep "\n" (map (outputName: ''
+        echo "Copying output ${outputName}"
+        set -x
+        cp -rs --no-preserve=mode "${pkg.${outputName}}" "''$${outputName}"
+        set +x
+      '') (old.outputs or [ "out" ]))}
+
+      rm -rf $out/bin/*
+      shopt -s nullglob # Prevent loop from running if no files
+      for file in ${pkg.out}/bin/*; do
+        echo "#!${pkgs.bash}/bin/bash" > "$out/bin/$(basename $file)"
+        echo "exec -a \"\$0\" ${nixGL.auto.nixGLDefault}/bin/nixGL $file \"\$@\"" >> "$out/bin/$(basename $file)"
+        chmod +x "$out/bin/$(basename $file)"
+      done
+      shopt -u nullglob # Revert nullglob back to its normal default state
+    '';
+  }))

packages.nix

@@ -1,4 +1,6 @@
 { config, pkgs, ... }:
+let nixGL = import ./nixGL.nix { inherit pkgs config; };
+in
 {
   home.packages = with pkgs; [
     mullvad-vpn
@@ -7,6 +9,7 @@
     htop
     ollama
     wget
+    (nixGL firefox)
     ripgrep
     bat
     monolith
@@ -18,6 +21,7 @@
     obsidian
     dfc
     anki
+    (nixGL digikam)
     deno
     nodejs_21
   ];