From 8ad14220eb2d9243f53cd6e9188ebfeab5bf37fc Mon Sep 17 00:00:00 2001
From: liwenkai <2020583117@qq.com>
Date: Mon, 29 Jun 2026 19:58:33 +0800
Subject: [PATCH] =?UTF-8?q?fix(tui):=20Windows=20=E4=B9=9F=E6=8A=8A=20stde?=
 =?UTF-8?q?rr=20=E9=87=8D=E5=AE=9A=E5=90=91=E5=88=B0=E6=97=A5=E5=BF=97(Set?=
 =?UTF-8?q?StdHandle),=E9=81=BF=E5=85=8D=20LSP/=E9=94=99=E8=AF=AF=E8=BE=93?=
 =?UTF-8?q?=E5=87=BA=E7=B3=8A=E5=B1=8F?=
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---
 Cargo.lock                      |  1 +
 crates/deep-code-tui/Cargo.toml |  8 ++++++++
 crates/deep-code-tui/src/ui.rs  | 36 ++++++++++++++++++++++++++++++++-
 3 files changed, 44 insertions(+), 1 deletion(-)

diff --git a/Cargo.lock b/Cargo.lock
index 3e9639c..c617da0 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -950,6 +950,7 @@ dependencies = [
  "tokio-util",
  "unicode-segmentation",
  "unicode-width 0.2.0",
+ "windows-sys 0.59.0",
 ]
 
 [[package]]
diff --git a/crates/deep-code-tui/Cargo.toml b/crates/deep-code-tui/Cargo.toml
index 25b256a..e99ab4c 100644
--- a/crates/deep-code-tui/Cargo.toml
+++ b/crates/deep-code-tui/Cargo.toml
@@ -26,5 +26,13 @@ unicode-width = "0.2"
 tokio = { version = "1", features = ["macros", "rt-multi-thread", "sync", "time"] }
 tokio-util = { version = "0.7", features = ["rt"] }
 
+# Redirect stderr to the log file on Windows (SetStdHandle), mirroring the
+# unix `dup2` path so stray writes can't paint over the alternate-screen TUI.
+[target.'cfg(windows)'.dependencies]
+windows-sys = { version = "0.59", features = [
+    "Win32_Foundation",
+    "Win32_System_Console",
+] }
+
 [dev-dependencies]
 tempfile = "3"
diff --git a/crates/deep-code-tui/src/ui.rs b/crates/deep-code-tui/src/ui.rs
index 52489a6..b38794c 100644
--- a/crates/deep-code-tui/src/ui.rs
+++ b/crates/deep-code-tui/src/ui.rs
@@ -108,7 +108,41 @@ fn redirect_stderr_to_log() {
     }
 }
 
-#[cfg(not(unix))]
+/// Windows equivalent of the unix path: point the process's `STD_ERROR_HANDLE`
+/// at the log file via `SetStdHandle`, so LSP/persistence `eprintln!`s land in
+/// the log instead of corrupting the alternate-screen TUI.
+#[cfg(windows)]
+fn redirect_stderr_to_log() {
+    use std::os::windows::io::AsRawHandle;
+
+    use windows_sys::Win32::Foundation::HANDLE;
+    use windows_sys::Win32::System::Console::{STD_ERROR_HANDLE, SetStdHandle};
+
+    let path = crate::cli::workspace_root()
+        .join(".deep-code")
+        .join("deep-code.log");
+    if let Some(parent) = path.parent() {
+        let _ = std::fs::create_dir_all(parent);
+    }
+    let Ok(file) = std::fs::OpenOptions::new()
+        .create(true)
+        .append(true)
+        .open(&path)
+    else {
+        return;
+    };
+    let handle: HANDLE = file.as_raw_handle();
+    // SAFETY: `handle` is a valid, writable file handle. SetStdHandle just
+    // records it as the process's stderr; `forget` keeps it open for the
+    // process lifetime (the alternate-screen TUI runs until exit), mirroring how
+    // the unix `dup2` fd outlives the dropped `File`.
+    unsafe {
+        SetStdHandle(STD_ERROR_HANDLE, handle);
+    }
+    std::mem::forget(file);
+}
+
+#[cfg(not(any(unix, windows)))]
 fn redirect_stderr_to_log() {}
 
 fn run_loop(terminal: &mut AppTerminal, app: &mut App) -> Result<()> {