desktop-client: nixify package

desktop-client/default.nix

@@ -0,0 +1,4 @@
+let
+  nixpkgs = import <nixpkgs> { };
+in
+nixpkgs.callPackage ./package.nix { }

desktop-client/flake.nix

@@ -0,0 +1,27 @@
+{
+  description = "Streamlined Desktop Client";
+  inputs = {
+    nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable";
+  };
+  outputs =
+    { nixpkgs, ... }:
+    let
+      inherit (nixpkgs) lib;
+      inherit (builtins) attrNames;
+      inherit (lib.attrsets) genAttrs;
+      architectures = attrNames nixpkgs.legacyPackages;
+      forAllSystems = genAttrs architectures;
+    in
+    {
+      packages = forAllSystems (
+        system:
+        let
+          pkgs = import nixpkgs { inherit system; };
+        in
+        rec {
+          default = streamlined-client;
+          streamlined-client = pkgs.callPackage ./package.nix { };
+        }
+      );
+    };
+}

desktop-client/package.nix

@@ -0,0 +1,51 @@
+{
+  lib,
+  writeText,
+  python3Packages,
+  mypy,
+  ...
+}:
+let
+  name = "streamlined-client";
+  version = "2025.06.29";
+  project_toml = writeText "${name}_pyproject" ''
+    [build-system]
+    requires = ["setuptools >= 61.0"]
+    build-backend = "setuptools.build_meta"
+    [project]
+    name = "${name}"
+    version = "${version}"
+    requires-python = ">= 3.11"
+    [project.scripts]
+    ${name} = "streamlined.client.app:main"
+  '';
+in
+python3Packages.buildPythonPackage {
+  inherit name version;
+  format = "pyproject";
+
+  build-system = lib.singleton python3Packages.setuptools;
+
+  dependencies = with python3Packages; [
+    setuptools
+  ];
+
+  unpackPhase = ''
+    cp ${project_toml} ./pyproject.toml
+    mkdir --parent ./src/streamlined/client
+    touch ./src/streamlined{,/client}/__init__.py
+    cp -r ${./app.py} ./src/streamlined/client/app.py
+    chmod --recursive u=rwX ./src  # required so further build steps can create wrapper files
+    ${lib.getExe mypy} --strict ./src
+  '';
+
+  postInstall = ''
+    mkdir --parent $out/share/applications
+    STREAMLINED_DESKTOP_TEMPLATE=${./entry.desktop} $out/bin/${name} misc generate-desktop-file > $out/share/applications/${name}_uri.desktop
+  '';
+
+  meta = {
+    description = "Streamlined Desktop Client";
+    mainProgram = name;
+  };
+}