Merge pull request #4615 from NixOS/nix-show-stats-with-nix-cmd

Make NIX_SHOW_STATS work with new-style commands

src/libcmd/command.hh

@@ -48,6 +48,8 @@ struct EvalCommand : virtual StoreCommand, MixEvalArgs
     ref<EvalState> getEvalState();
 
     std::shared_ptr<EvalState> evalState;
+
+    ~EvalCommand();
 };
 
 struct MixFlakeOptions : virtual Args, EvalCommand

src/libcmd/installables.cc

@@ -280,6 +280,12 @@ ref<EvalState> EvalCommand::getEvalState()
     return ref<EvalState>(evalState);
 }
 
+EvalCommand::~EvalCommand()
+{
+    if (evalState)
+        evalState->printStats();
+}
+
 void completeFlakeRef(ref<Store> store, std::string_view prefix)
 {
     if (prefix == "")