stump: refactor to utilize finalAttrs

While the functional behaviour was introduced, the stump package hasn't
been using it much and instead utilized a let-in block.
The contents of the let-in block has been moved inside and the
derivation function and the `finalAttrs` argument has been used where
needed.
This will enable easier automatic updates using nix-update-script (see
next commit).

pkgs/by-name/st/stump/package.nix

@@ -17,19 +17,20 @@
   pkg-config,
   makeWrapper,
 }:
-let
+rustPlatform.buildRustPackage (finalAttrs: {
+  pname = "stump";
   version = "0.1.5";
 
   src = fetchFromGitHub {
     owner = "stumpapp";
     repo = "stump";
-    tag = "v${version}";
+    tag = "v${finalAttrs.version}";
     hash = "sha256-kstMk4HJopLHW22ynVZF0itWUixwiDkbsMUpYMvw1Ag=";
   };
 
-  frontend = stdenv.mkDerivation (finalAttrs: {
+  frontend = stdenv.mkDerivation (_: {
     pname = "stump-frontend";
-    inherit src version;
+    inherit (finalAttrs) src version;
 
     yarnOfflineCache = fetchYarnDeps {
       yarnLock = finalAttrs.src + "/yarn.lock";
@@ -55,10 +56,6 @@ let
       mv ./apps/web/dist $out
     '';
   });
-in
-rustPlatform.buildRustPackage (finalAttrs: {
-  pname = "stump";
-  inherit src version;
 
   __structuredAttrs = true;
 
@@ -71,7 +68,7 @@ rustPlatform.buildRustPackage (finalAttrs: {
     "stump_server"
   ];
 
-  env.GIT_REV = "v${version}";
+  env.GIT_REV = "v${finalAttrs.version}";
 
   nativeBuildInputs = [
     pkg-config
@@ -97,7 +94,7 @@ rustPlatform.buildRustPackage (finalAttrs: {
   postInstall = ''
     wrapProgram $out/bin/stump_server \
       --set-default STUMP_CONFIG_DIR /var/lib/stump/config \
-      --set-default STUMP_CLIENT_DIR ${frontend} \
+      --set-default STUMP_CLIENT_DIR ${finalAttrs.frontend} \
       --set-default STUMP_PORT 10001 \
       --set-default STUMP_PROFILE release \
       --set-default PDFIUM_PATH ${pdfium-binaries}/lib/libpdfium.so \