feat: a lot of stuff

overlays/pppdf/default.nix

@@ -0,0 +1,26 @@
+{ pkgs, lib, buildPythonApplication, python3Packages }:
+buildPythonApplication {
+  pname = "pppdf";
+  version = "1.0.0";
+  src = ./pppdf.py;
+
+  nativeBuildInputs = [
+    pkgs.wrapGAppsHook
+    pkgs.gobject-introspection
+  ];
+
+  propagatedBuildInputs = with python3Packages; [ pkgs.gtk3 pygobject3 notify2 pikepdf ];
+
+  dontUnpack = true;
+  format = "other";
+
+  installPhase = ''
+    install -D $src $out/bin/pppdf
+  '';
+
+  meta = with lib; {
+    description = "PDF Postprocessor";
+    license = licenses.mit;
+  };
+
+}