Keyd : Fix patch.

overlay/Keyd.nix

@@ -1,11 +1,40 @@
-# Add a patch for https://github.com/rvaiya/keyd/pull/545
-{ ... }: {
+# HACK: Add a patch for https://github.com/rvaiya/keyd/pull/545
+{ lib, ... }: {
 	nixpkgs.overlays = [ (final: prev: {
-		keyd = prev.keyd.overrideAttrs (old: {
+			keyd = prev.keyd.overrideAttrs (old: rec {
 					patches = (old.patches or []) ++ [(prev.fetchpatch {
 						url  = "https://patch-diff.githubusercontent.com/raw/rvaiya/keyd/pull/545.patch";
 						hash = "sha256-aal8oAXws6DcpeCl7G9GMJQXeLDDbyotWFut0Rf82WI=";
 					})];
+
+					postInstall = let
+						pypkgs = prev.python3.pkgs;
+						appMap = pypkgs.buildPythonApplication rec {
+							inherit (prev.keyd) version src;
+							inherit patches;
+
+							pname  = "keyd-application-mapper";
+							format = "other";
+
+							postPatch = ''
+								substituteInPlace scripts/${pname} \
+									--replace /bin/sh ${prev.runtimeShell}
+							'';
+
+							propagatedBuildInputs = with pypkgs; [ xlib ];
+
+							dontBuild = true;
+
+							installPhase = ''
+								install -Dm555 -t $out/bin scripts/${pname}
+							'';
+
+							meta.mainProgram = "keyd-application-mapper";
+						};
+					in ''
+						ln -sf ${lib.getExe appMap} $out/bin/${appMap.pname}
+						rm -rf $out/etc
+					'';
 			});
 	})];
 }