From 2593c5bf601fa0b35595dcf911d922d303ac09ed Mon Sep 17 00:00:00 2001
From: Leni Aniva <v@leni.sh>
Date: Tue, 8 Jul 2025 14:16:37 -0700
Subject: [PATCH] feat(repl): Isolate stdout

---
 Repl.lean | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/Repl.lean b/Repl.lean
index 963503b..2574dab 100644
--- a/Repl.lean
+++ b/Repl.lean
@@ -267,7 +267,10 @@ def execute (command: Protocol.Command): MainM Json := do
     try
       match fromJson? command.payload with
       | .ok args => do
-        match (← comm args |>.run) with
+        let (msg, result) ← IO.FS.withIsolatedStreams (isolateStderr := false) $ comm args
+        if !msg.isEmpty then
+          IO.eprintln s!"stdout: {msg}"
+        match result with
         | .ok result =>  return toJson result
         | .error ierror => return toJson ierror
       | .error error => return toJson $ errorCommand s!"Unable to parse json: {error}"