all: refactor to follow RFC140

pkgs/by-name/cu/cura5/package.nix

@@ -0,0 +1,39 @@
+{ stdenv
+, fetchurl
+, writeScriptBin
+, appimageTools
+}:
+
+let
+  pname = "cura5";
+  version = "5.4.0";
+  name = "${pname}-${version}";
+
+  cura5 = appimageTools.wrapType2 {
+    inherit pname version;
+    src = fetchurl {
+      url = "https://github.com/Ultimaker/Cura/releases/download/${version}/Ultimaker-Cura-${version}-linux-modern.AppImage";
+      hash = "sha256-QVv7Wkfo082PH6n6rpsB79st2xK2+Np9ivBg/PYZd74=";
+    };
+    extraPkgs = _: [ ];
+  };
+  script = writeScriptBin pname ''
+    #!${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
+    exec "${cura5}/bin/${name}" "''${args[@]}"
+  '';
+in
+script // {
+  inherit name pname version;
+  meta.platforms = [ "x86_64-linux" ];
+}