qownnotes: add darwin support

pkgs/applications/office/qownnotes/default.nix

@@ -3,9 +3,13 @@
 , qtx11extras, qtwayland
 }:
 
-mkDerivation rec {
+let
   pname = "qownnotes";
+  appname = "QOwnNotes";
   version = "22.12.3";
+in
+stdenv.mkDerivation {
+  inherit pname appname version;
 
   src = fetchurl {
     url = "https://download.tuxfamily.org/${pname}/src/${pname}-${version}.tar.xz";
@@ -14,16 +18,32 @@ mkDerivation rec {
     sha256 = "sha256-fpI7RYOGmWwmau6tF8FPmY2/FtN9foWRX8/WgrNU6E8=";
   };
 
-  nativeBuildInputs = [ qmake qttools ];
+  nativeBuildInputs = [
+    qmake
+    qttools
+    wrapQtAppsHook
+  ] ++ lib.optionals stdenv.isDarwin [ makeWrapper ];
 
   buildInputs = [ qtbase qtsvg qtdeclarative qtxmlpatterns qtwebsockets qtx11extras ]
     ++ lib.optionals stdenv.isLinux [ qtwayland ];
 
+  postInstall =
+  # Create a lowercase symlink for Linux
+  lib.optionalString stdenv.isLinux ''
+    ln -s $out/bin/${appname} $out/bin/${pname}
+  ''
+  # Wrap application for macOS as lowercase binary
+  + lib.optionalString stdenv.isDarwin ''
+    mkdir -p $out/Applications
+    mv $out/bin/${appname}.app $out/Applications
+    makeWrapper $out/Applications/${appname}.app/Contents/MacOS/${appname} $out/bin/${pname}
+  '';
+
   meta = with lib; {
     description = "Plain-text file notepad and todo-list manager with markdown support and Nextcloud/ownCloud integration";
     homepage = "https://www.qownnotes.org/";
     license = licenses.gpl2Only;
     maintainers = with maintainers; [ totoroot ];
-    platforms = platforms.linux;
+    platforms = platforms.unix;
   };
 }