trippy: generate shell completions (#353196)

pkgs/tools/networking/trippy/default.nix

@@ -1,6 +1,8 @@
 { lib
+, stdenv
 , rustPlatform
 , fetchFromGitHub
+, installShellFiles
 }:
 
 rustPlatform.buildRustPackage rec {
@@ -14,8 +16,18 @@ rustPlatform.buildRustPackage rec {
     hash = "sha256-ArSIeu3u+TUy18rzJvhq0+/qvi5xPZmtQ7rPpwaEx9g=";
   };
 
+  nativeBuildInputs = [ installShellFiles ];
+
   cargoHash = "sha256-h1NQQFjtlpQuyTz7AHuAPUe1GxR0Q2yKzow8XB9375U=";
 
+  postInstall = lib.optionalString (stdenv.buildPlatform.canExecute stdenv.hostPlatform) ''
+    local INSTALL="$out/bin/trip"
+    installShellCompletion --cmd trip \
+      --bash <($out/bin/trip --generate bash) \
+      --fish <($out/bin/trip --generate fish) \
+      --zsh <($out/bin/trip --generate zsh)
+  '';
+
   meta = with lib; {
     description = "Network diagnostic tool";
     homepage = "https://trippy.cli.rs";