From b660cad80450147610091e0e5758faa6276e5983 Mon Sep 17 00:00:00 2001
From: Can Celik <ogulcancelik@gmail.com>
Date: Sat, 15 Aug 2026 15:03:59 +0300
Subject: fix(client): handle remote terminal hangup (#2827)

refs #2424
---
 src/client/mod.rs | 46 ++++++++++++++++++++++++++++++++++------------
 1 file changed, 34 insertions(+), 12 deletions(-)

(limited to 'src/client')

diff --git a/src/client/mod.rs b/src/client/mod.rs
index cba735fa..b70b6c9c 100644
--- a/src/client/mod.rs
+++ b/src/client/mod.rs
@@ -421,6 +421,7 @@ fn setup_terminal_with_capabilities(
     Ok(TerminalGuard {
         reset_modify_other_keys: modify_other_keys_mode.is_some(),
         reset_host_color_scheme_reports: host_color_scheme_reports,
+        restored: false,
         #[cfg(windows)]
         restore_windows_input_mode: windows_virtual_terminal_input.restore_mode,
     })
@@ -434,6 +435,7 @@ fn should_enable_host_color_scheme_reports(enable_client_protocols: bool) -> boo
 struct TerminalGuard {
     reset_modify_other_keys: bool,
     reset_host_color_scheme_reports: bool,
+    restored: bool,
     #[cfg(windows)]
     restore_windows_input_mode: Option<u32>,
 }
@@ -582,7 +584,7 @@ fn restore_terminal_state(
     reset_modify_other_keys: bool,
     reset_host_color_scheme_reports: bool,
     #[cfg(windows)] restore_windows_input_mode: Option<u32>,
-) {
+) -> io::Result<()> {
     let _ = clear_received_kitty_graphics(&mut io::stdout());
 
     // Reset modifyOtherKeys if we enabled it.
@@ -606,13 +608,16 @@ fn restore_terminal_state(
         restore_windows_input_mode_value(mode);
     }
 
-    let _ = ratatui::try_restore();
-    let _ = write_terminal_restore_postlude(&mut io::stdout(), reset_host_color_scheme_reports);
+    let restore_result = ratatui::try_restore();
+    let postlude_result =
+        write_terminal_restore_postlude(&mut io::stdout(), reset_host_color_scheme_reports);
 
     #[cfg(windows)]
     if windows_vti_input_backend_enabled() && windows_win32_input_mode_enabled() {
         let _ = disable_windows_win32_input_mode(&mut io::stdout());
     }
+
+    restore_result.and(postlude_result)
 }
 
 #[cfg(not(windows))]
@@ -657,14 +662,28 @@ fn disable_windows_win32_input_mode(writer: &mut impl std::io::Write) -> io::Res
     writer.flush()
 }
 
-impl Drop for TerminalGuard {
-    fn drop(&mut self) {
+impl TerminalGuard {
+    fn restore(mut self) -> io::Result<()> {
+        self.restored = true;
         restore_terminal_state(
             self.reset_modify_other_keys,
             self.reset_host_color_scheme_reports,
             #[cfg(windows)]
             self.restore_windows_input_mode,
-        );
+        )
+    }
+}
+
+impl Drop for TerminalGuard {
+    fn drop(&mut self) {
+        if !self.restored {
+            let _ = restore_terminal_state(
+                self.reset_modify_other_keys,
+                self.reset_host_color_scheme_reports,
+                #[cfg(windows)]
+                self.restore_windows_input_mode,
+            );
+        }
     }
 }
 
@@ -1281,7 +1300,7 @@ fn run_client_with_mode(
     let panic_restore_windows_input_mode = terminal_guard.restore_windows_input_mode;
     let original_hook = std::panic::take_hook();
     std::panic::set_hook(Box::new(move |info| {
-        restore_terminal_state(
+        let _ = restore_terminal_state(
             panic_resets_modify_other_keys,
             panic_resets_host_color_scheme_reports,
             #[cfg(windows)]
@@ -1323,19 +1342,22 @@ fn run_client_with_mode(
     });
 
     // Restore the terminal before printing any final status message.
-    drop(terminal_guard);
+    let terminal_restore_failed = terminal_guard.restore().is_err();
 
     if let Err(err) = result {
-        eprintln!("herdr: {err}");
+        let _ = writeln!(io::stderr(), "herdr: {err}");
         rt.shutdown_timeout(Duration::from_millis(100));
         crate::logging::shutdown("client");
 
-        if matches!(
-            err,
+        let detached = matches!(
+            &err,
             ClientError::ServerShutdown {
                 reason: Some(reason)
             } if reason == "detached"
-        ) {
+        );
+        let connection_lost_during_terminal_hangup =
+            terminal_restore_failed && matches!(&err, ClientError::ConnectionLost(_));
+        if detached || connection_lost_during_terminal_hangup {
             return Ok(());
         }
 
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