nix-configuration/modules/ui/flatpak.nix

{ nix-flatpak, pkgs, config, lib, ... }:

# Flatpak support and options
let
	cfg = config.host.ui.flatpak;
in
with lib;
{
	options = {
		host.ui.flatpak.enable = mkEnableOption (mdDoc "Enables Flatpak");
	};

	config = mkIf cfg.enable {
		# Enable Flatpak
		services.flatpak = {
			enable = true;

			# Manage all Flatpak packages and remotes
			uninstallUnmanaged = true;

			# Enable daily automatic updates
			update.auto = {
				enable = true;
				onCalendar = "daily";
			};

			# Add remote(s)
			remotes = [
				{ name = "flathub"; location = "https://dl.flathub.org/repo/flathub.flatpakrepo"; }
			];

			# Install Flatpaks. For details, see https://github.com/gmodena/nix-flatpak
			packages = [		
				"com.github.tchx84.Flatseal"
				"md.obsidian.Obsidian"
				"net.waterfox.waterfox"
				"org.keepassxc.KeePassXC"
				"org.mozilla.firefox"
			];
		};

		# Workaround for getting Flatpak apps to use system fonts, icons, and cursors
		# For details (and source), see https://github.com/NixOS/nixpkgs/issues/119433#issuecomment-1767513263
		# NOTE: If fonts in Flatpaks appear incorrect (like squares), run this command to regenerate the font cache:
		#  flatpak list --columns=application | xargs -I %s -- flatpak run --command=fc-cache %s -f -v
		system.fsPackages = [ pkgs.bindfs ];
		fileSystems = let
			mkRoSymBind = path: {
				device = path;
				fsType = "fuse.bindfs";
				options = [ "ro" "resolve-symlinks" "x-gvfs-hide" ];
			};
			aggregatedIcons = pkgs.buildEnv {
				name = "system-icons";
				paths = with pkgs; [
					#libsForQt5.breeze-qt5	# for plasma
					gnome.gnome-themes-extra
					papirus-icon-theme
					qogir-icon-theme
				];
				pathsToLink = [ "/share/icons" ];
			};
			aggregatedFonts = pkgs.buildEnv {
				name = "system-fonts";
				paths = config.fonts.packages;
				pathsToLink = [ "/share/fonts" ];
			};
		in {
			"/usr/share/icons" = mkRoSymBind "${aggregatedIcons}/share/icons";
			"/usr/local/share/fonts" = mkRoSymBind "${aggregatedFonts}/share/fonts";
		};
	};
}