celeste64: add desktop item

packages/celeste64/default.nix

@@ -1,7 +1,8 @@
 { lib, fetchFromGitHub, buildDotnetModule, dotnetCorePackages, libGL, stdenv
-, systemdLibs, libpulseaudio, wayland, libdecor, libxkbcommon }:
-buildDotnetModule {
-  pname = "Celeste64";
+, systemdLibs, libpulseaudio, wayland, libdecor, libxkbcommon, makeDesktopItem
+, copyDesktopItems }:
+buildDotnetModule rec {
+  pname = "celeste64";
   version = "1.0.1";
 
   src = fetchFromGitHub {
@@ -18,6 +19,18 @@ buildDotnetModule {
   executables = [ "Celeste64" ];
   projectFile = "Celeste64.csproj";
 
+  nativeBuildInputs = [ copyDesktopItems ];
+  desktopItems = [
+    (makeDesktopItem rec {
+      name = "Celeste64";
+      desktopName = name;
+      exec = name;
+      icon = name;
+      comment = meta.description;
+      categories = [ "Game" ];
+    })
+  ];
+
   runtimeDeps = [
     stdenv.cc.cc.lib
     libGL
@@ -29,7 +42,8 @@ buildDotnetModule {
   ];
 
   preFixup = ''
-    cp -r ./Content $out/lib/Celeste64/Content
+    cp -r ./Content $out/lib/celeste64/Content
+    install -D ./Content/Sprites/icon_strawberry.png $out/share/icons/hicolor/128x128/apps/Celeste64.png
   '';
 
   meta = with lib; {