nixos-config/lib/builders/xdg/make-portal-config.nix

{ lib, writeTextFile }:

/* Create an XDG Portals configuration with the given desktop name and its
   configuration. Similarly, the given desktop name is assumed to be already
   in its suitable form of a lowercase ASCII.
*/
{ desktopName ? "common",

# Nix-representable data to be exported as the portal configuration.
config, }:
writeTextFile {
  name = "xdg-portal-config${
      lib.optionalString (desktopName != "common") "-${desktopName}"
    }";
  text = lib.generators.toINI { } config;
  destination = "/share/xdg-desktop-portal/${
      lib.optionalString (desktopName != "common") "${desktopName}-"
    }portals.conf";
}