overlays/persistent-nix-shell/default.nix


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{ final, prev, ... }: {
  persistent-nix-shell = prev.stdenv.mkDerivation {
    name = "persistent-nix-shell";
    src = ./persistent-nix-shell;

    phases = [ "buildPhase" "installPhase" ];

    buildPhase = ''
      substitute $src persistent-nix-shell \
        --subst-var-by zsh ${final.zsh}
    '';

    installPhase = ''
      install -m 0755 -D -t $out/bin \
        persistent-nix-shell
    '';
  };
}