ckan: Install desktop file and icons

pkgs/by-name/ck/ckan/package.nix

@@ -6,6 +6,9 @@
   mono,
   gtk2,
   curl,
+  imagemagick,
+  copyDesktopItems,
+  makeDesktopItem,
 }:
 
 stdenv.mkDerivation rec {
@@ -17,9 +20,19 @@ stdenv.mkDerivation rec {
     sha256 = "sha256-SK2eKdH/bm+W+qU8XUHRD9uffmfp5bR4dBvBEUKCm8E=";
   };
 
+  icon = fetchurl {
+    url = "https://raw.githubusercontent.com/KSP-CKAN/CKAN/450e2f960e1a3fee4ab7cf74ad56bddc5296fc7e/assets/ckan-256.png";
+    hash = "sha256-BJvuOz8NWmzpYzzhveeq6rcuqXIxQqxtBIcRvobx+TY=";
+  };
+
   dontUnpack = true;
 
-  nativeBuildInputs = [ makeWrapper ];
+  nativeBuildInputs = [
+    copyDesktopItems
+    imagemagick
+    makeWrapper
+  ];
+
   buildInputs = [ mono ];
 
   libraries = lib.makeLibraryPath [
@@ -30,12 +43,38 @@ stdenv.mkDerivation rec {
   dontBuild = true;
 
   installPhase = ''
+    runHook preInstall
+    for size in 16 24 48 64 96 128 256; do
+      mkdir -p $out/share/icons/hicolor/"$size"x"$size"/apps
+      magick -background none ${icon} -resize "$size"x"$size" $out/share/icons/hicolor/"$size"x"$size"/apps/${pname}.png
+    done
     install -m 644 -D $src $out/bin/ckan.exe
     makeWrapper ${mono}/bin/mono $out/bin/ckan \
       --add-flags $out/bin/ckan.exe \
       --set LD_LIBRARY_PATH $libraries
+    runHook postInstall
   '';
 
+  desktopItems = [
+    (makeDesktopItem {
+      name = "ckan";
+      comment = "The Comprehensive Kerbal Archive Network Client";
+      desktopName = "CKAN";
+      categories = [
+        "Game"
+        "PackageManager"
+      ];
+      exec = "ckan";
+      icon = "ckan";
+      keywords = [
+        "Kerbal Space Program"
+        "KSP"
+        "Mod"
+      ];
+      extraConfig.X-GNOME-SingleWindow = "true";
+    })
+  ];
+
   meta = with lib; {
     description = "Mod manager for Kerbal Space Program";
     mainProgram = "ckan";