different way of installing icons

flake.nix

@@ -15,49 +15,31 @@
     name = "starc";
     version = "0.6.4";
 
-    icon = pkgs.fetchurl {
-      url = "https://github.com/story-apps/starc/blob/v${version}/img/starc.png";
-      sha256 = "sha256-wixqb1cV+WEhgxsl2CeOjrid4P0daHqh0O40h2iPst4=";
-    };
-
-    appimage = pkgs.fetchurl {
+    appImage = pkgs.fetchurl {
       url = "https://github.com/story-apps/starc/releases/download/v${version}/starc-setup.AppImage";
       sha256 = "sha256-KLawvuLyqd7aPidH3ghr7mLl9NFQ7nduhnxAq0RpToQ=";
     };
-
-    desktopItem = pkgs.makeDesktopItem {
-      exec = name;
-
-      inherit name;
-      desktopName = "Story Architect";
-      genericName = "Storywriting Software";
-
-      icon = name;
-
-      comment = "Advanced text editor for script writers.";
-      categories = ["Office" "TextEditor" "Utility"];
-
-      mimeTypes = ["application/x-${name}"];
-    };
   in {
     packages.${system} = {
-      default = pkgs.appimageTools.wrapType1 {
+      default = pkgs.appimageTools.wrapType2 {
         inherit name;
 
-        src = appimage;
+        src = appImage;
 
-        extraInstallCommands = ''
+        extraInstallCommands = let
+          contents = pkgs.appimageTools.extract {
+            src = appImage;
+            pname = name;
+            inherit version;
+          };
+        in ''
           # Install .desktop file
-          mkdir -p $out/share/
-          ln -s "${desktopItem}/share/applications" $out/share/applications
+          mkdir -p $out/share/applications
+          cp ${contents}/${name}.desktop $out/share/applications
 
           # Install icons
-          for dimension in 128 256 512; do
-              dimensions=''${dimension}x''${dimension}
-
-              mkdir -p $out/share/icons/hicolor/$dimensions/apps
-              "${pkgs.imagemagick}/bin/convert" ${icon} -resize $dimensions $out/share/icons/hicolor/$dimensions/apps/${name}.png
-          done
+          mkdir -p $out/share
+          cp -r ${contents}/share/icons $out/share
         '';
       };
     };
@@ -65,7 +47,7 @@
     apps.${system} = {
       dev = {
         program = "${pkgs.writeShellScript "download-appimage" ''
-          ${pkgs.curl}/bin/curl ${appimage.url} -Lo ${name}.AppImage
+          ${pkgs.curl}/bin/curl ${appImage.url} -Lo ${name}.AppImage
         ''}";
         type = "app";
       };