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 1/2] 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}"

From 855a882f7bfc8ee71007b3b64514f0f29b9e9e6c Mon Sep 17 00:00:00 2001
From: Leni Aniva <v@leni.sh>
Date: Tue, 8 Jul 2025 14:29:37 -0700
Subject: [PATCH 2/2] fix(repl): Extra newline in stdout bypass

---
 Repl.lean | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/Repl.lean b/Repl.lean
index 2574dab..c7a997d 100644
--- a/Repl.lean
+++ b/Repl.lean
@@ -269,7 +269,7 @@ def execute (command: Protocol.Command): MainM Json := do
       | .ok args => do
         let (msg, result) ← IO.FS.withIsolatedStreams (isolateStderr := false) $ comm args
         if !msg.isEmpty then
-          IO.eprintln s!"stdout: {msg}"
+          IO.eprint s!"stdout: {msg}"
         match result with
         | .ok result =>  return toJson result
         | .error ierror => return toJson ierror