all: refactor to follow RFC140

pkgs/by-name/ps/psst/package.nix

@@ -0,0 +1,72 @@
+{ lib
+, fetchFromGitHub
+, rustPlatform
+
+, pkg-config
+, alsaLib
+, dbus
+, openssl
+
+  # GUI
+, withGui ? true
+, copyDesktopItems
+, makeDesktopItem
+, gtk3
+}:
+
+let
+  inherit (lib) optional optionals;
+in
+
+assert withGui -> gtk3.meta.available;
+
+rustPlatform.buildRustPackage rec {
+  pname = "psst";
+  version = "20221012.d70ed81";
+  src = fetchFromGitHub {
+    owner = "jpochyla";
+    repo = "psst";
+    rev = "d70ed8104533dc15bc36b989ba8428872c9b578f";
+    hash = "sha256-ZKhHN0ruLb6ZVKkrKv/YawRsVop6SP1QF/nrtkmA8P8=";
+    fetchSubmodules = true;
+  };
+  cargoSha256 = "sha256-zH6+EV78FDVOYEFXk0f54pH2Su0QpK1I0bHqzIiMdBo=";
+
+  nativeBuildInputs = [ pkg-config ]
+    ++ optional withGui copyDesktopItems;
+
+  buildInputs = [ alsaLib dbus openssl ]
+    ++ optional withGui gtk3;
+
+  cargoBuildFlags = optionals (!withGui) [
+    "--workspace"
+    "--exclude"
+    "psst-gui"
+  ];
+
+  # Unable to exclude targets from the check phase as it doesn't respect
+  # `cargoBuildFlags`; to save from attempting to build the GUI without meaning
+  # to, don't bother checking for CLI-only builds.
+  # https://github.com/NixOS/nixpkgs/blob/77d190f10931c1d06d87bf6d772bf65346c71777/pkgs/build-support/rust/default.nix#L241
+  doCheck = withGui;
+
+  desktopItems = optionals withGui [
+    (makeDesktopItem {
+      name = pname;
+      desktopName = "psst";
+      genericName = "Spotify Player";
+      categories = [ "AudioVideo" "Audio" "Network" "Player" ];
+      comment = "Spotify client with native GUI";
+      exec = "psst-gui";
+      keywords = [ "spotify" "music" ];
+      icon = "spotify";
+      type = "Application";
+    })
+  ];
+
+  meta = with lib; {
+    description = "Fast and multi-platform Spotify client with native GUI ";
+    homepage = "https://github.com/jpochyla/psst";
+    license = licenses.mit;
+  };
+}