Disco: Install cura via AppImage

hosts/Disco.nix

@@ -81,7 +81,8 @@
         tdesktop
         horizon-eda
         kicad-small
-        cura
+        # cura
+        (pkgs.callPackage ../packages/cura-appimage.nix {})
         pulseview
         nextcloud-client
     ];

packages/cura-appimage.nix

@@ -0,0 +1,131 @@
+{
+  lib,
+  stdenv,
+  stdenvNoCC,
+  fetchurl,
+  writeScriptBin,
+  appimageTools,
+  copyDesktopItems,
+  makeDesktopItem,
+  nix-update-script,
+  wrapGAppsHook3,
+}:
+
+stdenvNoCC.mkDerivation rec {
+  pname = "cura-appimage";
+  version = "5.9.0";
+
+  # Give some good names so the intermediate packages are easy
+  # to recognise by name in the Nix store.
+  appimageBinName = "cura-appimage-tools-output";
+  wrapperScriptName = "${pname}-wrapper-script";
+
+  src = fetchurl {
+    url = "https://github.com/Ultimaker/Cura/releases/download/${version}/Ultimaker-Cura-${version}-linux-X64.AppImage";
+    hash = "sha256-STtVeM4Zs+PVSRO3cI0LxnjRDhOxSlttZF+2RIXnAp4=";
+  };
+
+  appimageContents = appimageTools.extract {
+    inherit pname version src;
+  };
+
+  curaAppimageToolsWrapped = appimageTools.wrapType2 {
+    inherit src;
+    # For `appimageTools.wrapType2`, `pname` determines the binary's name in `bin/`.
+    pname = appimageBinName;
+    inherit version;
+    extraPkgs = _: [ ];
+  };
+
+  # The `QT_QPA_PLATFORM=xcb` fixes Wayland support, see https://github.com/NixOS/nixpkgs/issues/186570#issuecomment-2526277637
+  # The `GTK_USE_PORTAL=1` fixes file dialog issues under Gnome, see https://github.com/NixOS/nixpkgs/pull/372614#issuecomment-2585663161
+  script = writeScriptBin wrapperScriptName ''
+    #!${stdenv.shell}
+    # AppImage version of Cura loses current working directory and treats all paths relateive to $HOME.
+    # So we convert each of the files passed as argument to an absolute path.
+    # This fixes use cases like `cd /path/to/my/files; cura mymodel.stl anothermodel.stl`.
+
+    args=()
+    for a in "$@"; do
+      if [ -e "$a" ]; then
+        a="$(realpath "$a")"
+      fi
+      args+=("$a")
+    done
+    QT_QPA_PLATFORM=xcb GTK_USE_PORTAL=1 exec "${curaAppimageToolsWrapped}/bin/${appimageBinName}" "''${args[@]}"
+  '';
+
+  dontUnpack = true;
+
+  nativeBuildInputs = [
+    copyDesktopItems
+    wrapGAppsHook3
+  ];
+  desktopItems = [
+    # Based on upstream.
+    # https://github.com/Ultimaker/Cura/blob/382b98e8b0c910fdf8b1509557ae8afab38f1817/packaging/AppImage/cura.desktop.jinja
+    (makeDesktopItem {
+      name = "cura";
+      desktopName = "UltiMaker Cura";
+      genericName = "3D Printing Software";
+      comment = meta.longDescription;
+      exec = "cura";
+      icon = "cura-icon";
+      terminal = false;
+      type = "Application";
+      mimeTypes = [
+        "model/stl"
+        "application/vnd.ms-3mfdocument"
+        "application/prs.wavefront-obj"
+        "image/bmp"
+        "image/gif"
+        "image/jpeg"
+        "image/png"
+        "text/x-gcode"
+        "application/x-amf"
+        "application/x-ply"
+        "application/x-ctm"
+        "model/vnd.collada+xml"
+        "model/gltf-binary"
+        "model/gltf+json"
+        "model/vnd.collada+xml+zip"
+      ];
+      categories = [ "Graphics" ];
+      keywords = [
+        "3D"
+        "Printing"
+      ];
+    })
+  ];
+
+  installPhase = ''
+    runHook preInstall
+
+    mkdir -p $out/bin
+    cp ${script}/bin/${wrapperScriptName} $out/bin/cura
+
+    mkdir -p $out/share/applications $out/share/icons/hicolor/128x128/apps
+    install -Dm644 ${appimageContents}/usr/share/icons/hicolor/128x128/apps/cura-icon.png $out/share/icons/hicolor/128x128/apps/cura-icon.png
+
+    runHook postInstall
+  '';
+
+  passthru.updateScript = nix-update-script { extraArgs = [ "--version-regex=([56789].+)" ]; };
+
+  meta = {
+    description = "3D printing software";
+    homepage = "https://github.com/ultimaker/cura";
+    changelog = "https://github.com/Ultimaker/Cura/releases/tag/${version}";
+    longDescription = ''
+      Cura converts 3D models into paths for a 3D printer. It prepares your print for maximum accuracy, minimum printing time and good reliability with many extra features that make your print come out great.
+    '';
+    license = lib.licenses.lgpl3Plus;
+    platforms = [ "x86_64-linux" ];
+    mainProgram = "cura";
+    maintainers = with lib.maintainers; [
+      pbek
+      nh2
+      fliegendewurst
+    ];
+  };
+}