Run gotk4 programs using the system's Nixpkgs because Nix Flakes sucks!!!

gotk4-run.sh

#!/usr/bin/env bash
set -eo pipefail

NIX_EXPR=$(cat <<-'EOF'
{
	mainProgram,
}:

let
	pkgs = import <nixpkgs> { };
in

pkgs.stdenv.mkDerivation {
	name = "${mainProgram}-wrapped";
	src = ./. + "/${mainProgram}";
	dontUnpack = true;

	buildInputs =  with pkgs; [
		gtk4
		glib
		libadwaita
		librsvg
		gdk-pixbuf
		gobject-introspection
		hicolor-icon-theme

		gtksourceview4
		gtksourceview5
		libspelling

		gst_all_1.gstreamer
		gst_all_1.gst-plugins-good
		gst_all_1.gst-plugins-bad
		gst_all_1.gst-plugins-ugly
	];

	nativeBuildInputs = with pkgs; [
		wrapGAppsHook
		autoPatchelfHook
	];

	sourceRoot = ".";

	buildPhase = ''
		mkdir -p \
			$out/bin

		install -Dm755 "$src" "$out/bin/${mainProgram}"
	'';
}
EOF
)

if [[ "$1" == shell ]]; then
	nix-shell -E "$NIX_EXPR" --argstr mainProgram "" --run bash
else
	mainProgram="${1:-$(basename "$PWD")}"
	out=$(nix-build -E "$NIX_EXPR" --argstr mainProgram "${mainProgram}" --no-out-link)
	exec "${out}/bin/${mainProgram}"
fi