add krunker

pkgs/krunker/default.nix

@@ -0,0 +1,29 @@
+{
+  appimageTools,
+  fetchurl,
+  imagemagick,
+}: let
+  pname = "krunker";
+  version = "0.0.1";
+  src = fetchurl {
+    url = "https://client2.krunker.io/setup.AppImage";
+    hash = "sha256-yG8E3a6AaX0TBK23TlBBLmiCfqzS8FldTfl7As4Dcvo=";
+  };
+  appimageContents = appimageTools.extract {
+    inherit pname version src;
+  };
+in
+  appimageTools.wrapType2 {
+    inherit pname version src;
+    extraInstallCommands = ''
+      for i in 16 24 48 64 96 128 256 512; do
+        mkdir -p $out/share/icons/hicolor/''${i}x''${i}/apps
+        ${imagemagick}/bin/convert -background none -resize ''${i}x ${appimageContents}/io.krunker.desktop.png $out/share/icons/hicolor/''${i}x''${i}/apps/io.krunker.desktop.png
+      done
+
+      install -m 444 -D ${appimageContents}/io.krunker.desktop.desktop $out/share/applications/krunker.desktop
+      substituteInPlace $out/share/applications/krunker.desktop \
+        --replace 'Exec=AppRun' 'Exec=${pname}' \
+        --replace 'Name=Official Krunker.io Client' 'Name=Krunker.io'
+    '';
+  }