refactor: make the whole thing more generic

overlays/darkman/default.nix

@@ -0,0 +1,47 @@
+{ lib, scdoc, buildGoModule, fetchFromGitLab, hidapi, udev, }:
+buildGoModule rec {
+  pname = "darkman";
+  version = "1.5.4";
+
+  src = fetchFromGitLab {
+    owner = "WhyNotHugo";
+    repo = "darkman";
+    rev = "5332193777fb0c5dbde6cbfd015a16697d6a0c8e";
+    hash = "sha256-3TGDy7hiI+z0IrA+d/Q+rMFlew6gipdpXyJ5eVLCmds=";
+  };
+
+  vendorHash = "sha256-xEPmNnaDwFU4l2G4cMvtNeQ9KneF5g9ViQSFrDkrafY=";
+
+  nativeBuildInputs = [ scdoc ];
+
+  postPatch = ''
+    substituteInPlace darkman.service \
+      --replace "/usr/bin/darkman" "$out/bin/darkman"
+    substituteInPlace contrib/dbus/nl.whynothugo.darkman.service \
+      --replace "/usr/bin/darkman" "$out/bin/darkman"
+    substituteInPlace contrib/dbus/org.freedesktop.impl.portal.desktop.darkman.service \
+      --replace "/usr/bin/darkman" "$out/bin/darkman"
+  '';
+
+  buildPhase = ''
+    runHook preBuild
+    make build
+    runHook postBuild
+  '';
+
+  installPhase = ''
+    runHook preInstall
+    make PREFIX=$out install
+    runHook postInstall
+  '';
+
+  meta = with lib; {
+    description =
+      "Framework for dark-mode and light-mode transitions on Linux desktop";
+    homepage = "https://gitlab.com/WhyNotHugo/darkman";
+    license = licenses.isc;
+    maintainers = [ maintainers.ajgrf ];
+    platforms = platforms.linux;
+    mainProgram = "darkman";
+  };
+}