cargoDocsetHook: init, and use to simplify mx-sanebot build

pkgs/additional/cargo-docset/hook.nix

@@ -0,0 +1,9 @@
+{ makeSetupHook
+, cargo-docset
+}:
+makeSetupHook {
+  name = "cargo-docset-hook";
+  propagatedBuildInputs = [
+    cargo-docset
+  ];
+} ./hook.sh

pkgs/additional/cargo-docset/hook.sh

@@ -0,0 +1,11 @@
+postBuildHooks+=(_cargoDocset)
+postInstallHooks+=(_cargoDocsetInstall)
+
+_cargoDocset() {
+  cargo-docset docset
+}
+
+_cargoDocsetInstall() {
+  mkdir -p $out/share/docset
+  cp -R target/docset/* $out/share/docset/
+}

pkgs/additional/mx-sanebot/default.nix

@@ -1,5 +1,5 @@
 { lib
-, cargo-docset ? null
+, cargoDocsetHook ? null
 , openssl
 , pkg-config
 , rustPlatform
@@ -11,18 +11,9 @@ rustPlatform.buildRustPackage {
   src = ./.;
   cargoLock.lockFile = ./Cargo.lock;
 
-  nativeBuildInputs = [ pkg-config ] ++ lib.optional (cargo-docset != null) cargo-docset;
+  nativeBuildInputs = [ pkg-config ] ++ lib.optional (cargoDocsetHook != null) cargoDocsetHook;
   buildInputs = [ openssl ];
 
-  postBuild = ''
-    cargo-docset docset
-  '';
-
-  postInstall = ''
-    mkdir -p $out/share/docset
-    cp -R target/docset/* $out/share/docset/
-  '';
-
   # enables debug builds, if we want: https://github.com/NixOS/nixpkgs/issues/60919.
   hardeningDisable = [ "fortify" ];
 }

pkgs/default.nix

@@ -14,6 +14,7 @@ let
     bootpart-uefi-x86_64 = callPackage ./additional/bootpart-uefi-x86_64 { };
     browserpass-extension = callPackage ./additional/browserpass-extension { };
     cargo-docset = callPackage ./additional/cargo-docset { };
+    cargoDocsetHook = callPackage ./additional/cargo-docset/hook.nix { };
     feeds = lib.recurseIntoAttrs (callPackage ./additional/feeds { });
     gopass-native-messaging-host = callPackage ./additional/gopass-native-messaging-host { };
     gpodder-configured = callPackage ./additional/gpodder-configured { };