make it possible or easier to pass gtk themes to flatpaks

[beh-10257]

Description

I want to have the ability to pass my themes and icons and cursor theme to flatpaks there is already https://github.com/NixOS/nixpkgs/pull/262462 but thats only about icons and fonts it seems (hopefully cursor themes are included cause this is pain) so yeah this is what I used to do on arch put the themes I want to use in $HOME/.local/share/themes/ select the theme in nwg-look and than just give flatpaks the right to read xdg-data/themes and xdg-config/gtk-3.0 and xdg-config/gtk-4.0 and it will just work I even had my own custom theme at some point I don't know how to do this in nix in the first place but if theres is a way why not make it into an option which can be toggled on and off something like flatpak.theme.hack = true I guess if this will be implemented home-manager has to download stuff in .local/share/themes

but yeah I guess anyway thanks and thats all

[beh-10257]

anyway heres a temporary fix hopefully

{ config, pkgs, ... }:
let
home-path = ''${config.home-manager.users.your_user_name.home.path}'';
home-files = ''${config.home-manager.users.your_user_name.home-files}'';
icon_theme_name = ''${config.home-manager.users.your_user_name.gtk.iconTheme.name}'';
theme_name = ''${config.home-manager.users.your_user_name.gtk.theme.name}'';
cursor_theme_name= ''${config.home-manager.users.your_user_name.gtk.cursorTheme.name}'';
in
let
gawk=''${pkgs.gawk}/bin/gawk'';
flatpak=''${pkgs.flatpak}/bin/flatpak'';
su=''${pkgs.su}/bin/su'';
cursor_theme_path=''${home-files}/.local/share/icons/${cursor_theme_name}'';
icon_theme_path=''${home-files}/.local/share/icons/${icon_theme_name}'';
theme_path=''${home-files}/.local/share/themes/${theme_name}'';
icon_theme_path_1=''${home-path}/share/icons/${icon_theme_name}'';
theme_path_1=''${home-path}/share/themes/${theme_name}'';
in
let
workaround =
''
${gawk} -i inplace '{gsub(/\/nix\/store[^;]*;|!\/nix\/store[^;]*;/,""); print}' /var/lib/flatpak/overrides/global
${gawk} -i inplace '{gsub(/filesystems=/,"filesystems=${icon_theme_path};${theme_path};${cursor_theme_path};"); print}' /var/lib/flatpak/overrides/global
${gawk} -i inplace '{gsub(/\/nix\/store[^;]*;|!\/nix\/store[^;]*;/,""); print}' /home/your_user_name/.local/share/flatpak/overrides/global
${gawk} -i inplace '{gsub(/filesystems=/,"filesystems=${icon_theme_path};${theme_path};${cursor_theme_path};"); print}' /home/your_user_name/.local/share/flatpak/overrides/global
${flatpak} override --env=GTK_THEME=${theme_name}
${su} your_user_name -c '${flatpak} override --user --env=GTK_THEME=${theme_name}'
'';
in
{
  services = {
    flatpak = {
      enable = true;
    };
  };
  ##workaround for themes and icons
  systemd.services.workaround-for-theme-and-icons = {
      wantedBy = ["multi-user.target"];
      after = ["systemd-user-sessions.service"] ;
      before = ["getty.target"] ;
      script = workaround;
  };
  home-manager.users.your_user_name.home.file = {
    ".local/share/icons/${icon_theme_name}".source = config.home-manager.users.your_user_name.lib.file.mkOutOfStoreSymlink "${icon_theme_path_1}";
    ".local/share/themes/${theme_name}".source = config.home-manager.users.your_user_name.lib.file.mkOutOfStoreSymlink "${theme_path_1}";
  };
}

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