clippy

codex-rs/tui/src/app.rs

@@ -79,6 +79,8 @@ use color_eyre::eyre::WrapErr;
 use crossterm::event::KeyCode;
 use crossterm::event::KeyEvent;
 use crossterm::event::KeyEventKind;
+use ratatui::style::Modifier;
+use ratatui::style::Style;
 use ratatui::style::Stylize;
 use ratatui::text::Line;
 use ratatui::widgets::Paragraph;
@@ -712,6 +714,41 @@ impl App {
             .add_info_message(format!("Opened {url} in your browser."), None);
     }
 
+    fn insert_history_cell(&mut self, tui: &mut tui::Tui, cell: Arc<dyn HistoryCell>) {
+        if let Some(Overlay::Transcript(t)) = &mut self.overlay {
+            t.insert_cell(cell.clone());
+            tui.frame_requester().schedule_frame();
+        }
+        self.transcript_cells.push(cell.clone());
+        let mut display = cell.display_lines(tui.terminal.last_known_screen_size.width);
+        if !display.is_empty() {
+            if !cell.is_stream_continuation() {
+                if self.has_emitted_history_lines {
+                    display.insert(0, Line::from(""));
+                } else {
+                    self.has_emitted_history_lines = true;
+                }
+            }
+            if self.overlay.is_some() {
+                self.deferred_history_lines.extend(display);
+            } else {
+                tui.insert_history_lines(display);
+            }
+        }
+    }
+
+    fn insert_startup_header(&mut self, tui: &mut tui::Tui) {
+        let placeholder_style = Style::default().add_modifier(Modifier::DIM | Modifier::ITALIC);
+        let header = Arc::new(history_cell::SessionHeaderHistoryCell::new_with_style(
+            "loading".to_string(),
+            placeholder_style,
+            None,
+            self.config.cwd.clone(),
+            CODEX_CLI_VERSION,
+        )) as Arc<dyn HistoryCell>;
+        self.insert_history_cell(tui, header);
+    }
+
     fn clear_ui_header_lines_with_version(
         &self,
         width: u16,
@@ -1125,6 +1162,7 @@ impl App {
         };
         self.chat_widget = ChatWidget::new(init, self.server.clone());
         self.reset_thread_event_state();
+        self.insert_startup_header(tui);
         if let Some(summary) = summary {
             let mut lines: Vec<Line<'static>> = vec![summary.usage_line.clone().into()];
             if let Some(command) = summary.resume_command {
@@ -1237,7 +1275,8 @@ impl App {
         use tokio_stream::StreamExt;
         let (app_event_tx, mut app_event_rx) = unbounded_channel();
         let app_event_tx = AppEventSender::new(app_event_tx);
-        emit_project_config_warnings(&app_event_tx, &config);
+        let should_insert_startup_header =
+            matches!(&session_selection, SessionSelection::StartFresh);
         tui.set_notification_method(config.tui_notification_method);
 
         let harness_overrides =
@@ -1405,6 +1444,7 @@ impl App {
         let file_search = FileSearchManager::new(config.cwd.clone(), app_event_tx.clone());
         #[cfg(not(debug_assertions))]
         let upgrade_version = crate::updates::get_upgrade_version(&config);
+        emit_project_config_warnings(&app_event_tx, &config);
 
         let mut app = Self {
             server: thread_manager.clone(),
@@ -1443,6 +1483,10 @@ impl App {
             pending_primary_events: VecDeque::new(),
         };
 
+        if should_insert_startup_header {
+            app.insert_startup_header(tui);
+        }
+
         // On startup, if Agent mode (workspace-write) or ReadOnly is active, warn about world-writable dirs on Windows.
         #[cfg(target_os = "windows")]
         {
@@ -1793,29 +1837,7 @@ impl App {
             }
             AppEvent::InsertHistoryCell(cell) => {
                 let cell: Arc<dyn HistoryCell> = cell.into();
-                if let Some(Overlay::Transcript(t)) = &mut self.overlay {
-                    t.insert_cell(cell.clone());
-                    tui.frame_requester().schedule_frame();
-                }
-                self.transcript_cells.push(cell.clone());
-                let mut display = cell.display_lines(tui.terminal.last_known_screen_size.width);
-                if !display.is_empty() {
-                    // Only insert a separating blank line for new cells that are not
-                    // part of an ongoing stream. Streaming continuations should not
-                    // accrue extra blank lines between chunks.
-                    if !cell.is_stream_continuation() {
-                        if self.has_emitted_history_lines {
-                            display.insert(0, Line::from(""));
-                        } else {
-                            self.has_emitted_history_lines = true;
-                        }
-                    }
-                    if self.overlay.is_some() {
-                        self.deferred_history_lines.extend(display);
-                    } else {
-                        tui.insert_history_lines(display);
-                    }
-                }
+                self.insert_history_cell(tui, cell);
             }
             AppEvent::ApplyThreadRollback { num_turns } => {
                 if self.apply_non_pending_thread_rollback(num_turns) {
@@ -2906,6 +2928,30 @@ impl App {
             // thread, so unrelated shutdowns cannot consume this marker.
             self.pending_shutdown_exit_thread_id = None;
         }
+        if let EventMsg::SessionConfigured(session) = &event.msg
+            && let Some(first_cell) = self.transcript_cells.first_mut()
+            && matches!(
+                first_cell
+                    .as_ref()
+                    .as_any()
+                    .downcast_ref::<history_cell::SessionHeaderHistoryCell>(),
+                Some(startup_header) if startup_header.is_loading_placeholder()
+            )
+        {
+            let cell = Arc::new(history_cell::SessionHeaderHistoryCell::new(
+                session.model.clone(),
+                session.reasoning_effort,
+                session.cwd.clone(),
+                CODEX_CLI_VERSION,
+            )) as Arc<dyn HistoryCell>;
+            *first_cell = cell.clone();
+            if matches!(&self.overlay, Some(Overlay::Transcript(_))) {
+                self.overlay = Some(Overlay::new_transcript(self.transcript_cells.clone()));
+                tui.frame_requester().schedule_frame();
+            }
+            let display = cell.display_lines(tui.terminal.last_known_screen_size.width);
+            tui.replace_top_visible_history_lines(display)?;
+        }
         self.handle_codex_event_now(event);
         if self.backtrack_render_pending {
             tui.frame_requester().schedule_frame();
@@ -3244,8 +3290,8 @@ mod tests {
     use crate::file_search::FileSearchManager;
     use crate::history_cell::AgentMessageCell;
     use crate::history_cell::HistoryCell;
+    use crate::history_cell::SessionHeaderHistoryCell;
     use crate::history_cell::UserHistoryCell;
-    use crate::history_cell::new_session_info;
     use codex_core::CodexAuth;
     use codex_core::config::ConfigBuilder;
     use codex_core::config::ConfigOverrides;
@@ -3609,7 +3655,7 @@ mod tests {
                 true,
             )) as Arc<dyn HistoryCell>
         };
-        let make_header = |is_first| -> Arc<dyn HistoryCell> {
+        let make_header = |_is_first| -> Arc<dyn HistoryCell> {
             let event = SessionConfiguredEvent {
                 session_id: ThreadId::new(),
                 forked_from_id: None,
@@ -3626,12 +3672,11 @@ mod tests {
                 network_proxy: None,
                 rollout_path: Some(PathBuf::new()),
             };
-            Arc::new(new_session_info(
-                app.chat_widget.config_ref(),
-                app.chat_widget.current_model(),
-                event,
-                is_first,
-                None,
+            Arc::new(SessionHeaderHistoryCell::new(
+                event.model,
+                event.reasoning_effort,
+                event.cwd,
+                crate::version::CODEX_CLI_VERSION,
             )) as Arc<dyn HistoryCell>
         };
 
@@ -4106,7 +4151,7 @@ mod tests {
             )) as Arc<dyn HistoryCell>
         };
 
-        let make_header = |is_first| {
+        let make_header = |_is_first| {
             let event = SessionConfiguredEvent {
                 session_id: ThreadId::new(),
                 forked_from_id: None,
@@ -4123,12 +4168,11 @@ mod tests {
                 network_proxy: None,
                 rollout_path: Some(PathBuf::new()),
             };
-            Arc::new(new_session_info(
-                app.chat_widget.config_ref(),
-                app.chat_widget.current_model(),
-                event,
-                is_first,
-                None,
+            Arc::new(SessionHeaderHistoryCell::new(
+                event.model,
+                event.reasoning_effort,
+                event.cwd,
+                crate::version::CODEX_CLI_VERSION,
             )) as Arc<dyn HistoryCell>
         };
 

codex-rs/tui/src/app_backtrack.rs

@@ -29,7 +29,7 @@ use std::sync::Arc;
 
 use crate::app::App;
 use crate::app_event::AppEvent;
-use crate::history_cell::SessionInfoCell;
+use crate::history_cell::SessionHeaderHistoryCell;
 use crate::history_cell::UserHistoryCell;
 use crate::pager_overlay::Overlay;
 use crate::tui;
@@ -639,7 +639,7 @@ fn nth_user_position(
 fn user_positions_iter(
     cells: &[Arc<dyn crate::history_cell::HistoryCell>],
 ) -> impl Iterator<Item = usize> + '_ {
-    let session_start_type = TypeId::of::<SessionInfoCell>();
+    let session_start_type = TypeId::of::<SessionHeaderHistoryCell>();
     let user_type = TypeId::of::<UserHistoryCell>();
     let type_of = |cell: &Arc<dyn crate::history_cell::HistoryCell>| cell.as_any().type_id();
 

codex-rs/tui/src/chatwidget.rs

@@ -143,8 +143,6 @@ use rand::Rng;
 use ratatui::buffer::Buffer;
 use ratatui::layout::Rect;
 use ratatui::style::Color;
-use ratatui::style::Modifier;
-use ratatui::style::Style;
 use ratatui::style::Stylize;
 use ratatui::text::Line;
 use ratatui::widgets::Paragraph;
@@ -254,8 +252,6 @@ mod agent;
 use self::agent::spawn_agent;
 use self::agent::spawn_agent_from_existing;
 pub(crate) use self::agent::spawn_op_forwarder;
-mod session_header;
-use self::session_header::SessionHeader;
 mod skills;
 use self::skills::collect_tool_mentions;
 use self::skills::find_app_mentions;
@@ -544,7 +540,6 @@ pub(crate) struct ChatWidget {
     auth_manager: Arc<AuthManager>,
     models_manager: Arc<ModelsManager>,
     otel_manager: OtelManager,
-    session_header: SessionHeader,
     initial_user_message: Option<UserMessage>,
     token_info: Option<TokenUsageInfo>,
     rate_limit_snapshots_by_limit_id: BTreeMap<String, RateLimitSnapshotDisplay>,
@@ -1129,7 +1124,6 @@ impl ChatWidget {
         self.last_copyable_output = None;
         let forked_from_id = event.forked_from_id;
         let model_for_header = event.model.clone();
-        self.session_header.set_model(&model_for_header);
         self.current_collaboration_mode = self.current_collaboration_mode.with_updates(
             Some(model_for_header.clone()),
             Some(event.reasoning_effort),
@@ -1137,16 +1131,17 @@ impl ChatWidget {
         );
         self.refresh_model_display();
         self.sync_personality_command_enabled();
-        let session_info_cell = history_cell::new_session_info(
+        if let Some(session_info_body) = history_cell::new_session_info_body(
             &self.config,
             &model_for_header,
-            event,
+            &event,
             self.show_welcome_banner,
             self.auth_manager
                 .auth_cached()
                 .and_then(|auth| auth.account_plan_type()),
-        );
-        self.apply_session_info_cell(session_info_cell);
+        ) {
+            self.add_boxed_history(session_info_body);
+        }
 
         if let Some(messages) = initial_messages {
             self.replay_initial_messages(messages);
@@ -2769,7 +2764,7 @@ impl ChatWidget {
             .and_then(|mask| mask.model.clone())
             .unwrap_or_else(|| model_for_header.clone());
         let fallback_default = Settings {
-            model: header_model.clone(),
+            model: header_model,
             reasoning_effort: None,
             developer_instructions: None,
         };
@@ -2779,7 +2774,7 @@ impl ChatWidget {
             settings: fallback_default,
         };
 
-        let active_cell = Some(Self::placeholder_session_header_cell(&config));
+        let active_cell = None;
 
         let current_cwd = Some(config.cwd.clone());
         let queued_message_edit_binding =
@@ -2808,7 +2803,6 @@ impl ChatWidget {
             auth_manager,
             models_manager,
             otel_manager,
-            session_header: SessionHeader::new(header_model),
             initial_user_message,
             token_info: None,
             rate_limit_snapshots_by_limit_id: BTreeMap::new(),
@@ -2946,7 +2940,7 @@ impl ChatWidget {
             .and_then(|mask| mask.model.clone())
             .unwrap_or_else(|| model_for_header.clone());
         let fallback_default = Settings {
-            model: header_model.clone(),
+            model: header_model,
             reasoning_effort: None,
             developer_instructions: None,
         };
@@ -2956,7 +2950,7 @@ impl ChatWidget {
             settings: fallback_default,
         };
 
-        let active_cell = Some(Self::placeholder_session_header_cell(&config));
+        let active_cell = None;
         let current_cwd = Some(config.cwd.clone());
 
         let queued_message_edit_binding =
@@ -2985,7 +2979,6 @@ impl ChatWidget {
             auth_manager,
             models_manager,
             otel_manager,
-            session_header: SessionHeader::new(header_model),
             initial_user_message,
             token_info: None,
             rate_limit_snapshots_by_limit_id: BTreeMap::new(),
@@ -3115,7 +3108,7 @@ impl ChatWidget {
             spawn_agent_from_existing(conversation, session_configured, app_event_tx.clone());
 
         let fallback_default = Settings {
-            model: header_model.clone(),
+            model: header_model,
             reasoning_effort: None,
             developer_instructions: None,
         };
@@ -3151,7 +3144,6 @@ impl ChatWidget {
             auth_manager,
             models_manager,
             otel_manager,
-            session_header: SessionHeader::new(header_model),
             initial_user_message,
             token_info: None,
             rate_limit_snapshots_by_limit_id: BTreeMap::new(),
@@ -3948,15 +3940,7 @@ impl ChatWidget {
     }
 
     fn add_boxed_history(&mut self, cell: Box<dyn HistoryCell>) {
-        // Keep the placeholder session header as the active cell until real session info arrives,
-        // so we can merge headers instead of committing a duplicate box to history.
-        let keep_placeholder_header_active = !self.is_session_configured()
-            && self
-                .active_cell
-                .as_ref()
-                .is_some_and(|c| c.as_any().is::<history_cell::SessionHeaderHistoryCell>());
-
-        if !keep_placeholder_header_active && !cell.display_lines(u16::MAX).is_empty() {
+        if !cell.display_lines(u16::MAX).is_empty() {
             // Only break exec grouping if the cell renders visible lines.
             self.flush_active_cell();
             self.needs_final_message_separator = true;
@@ -6759,8 +6743,6 @@ impl ChatWidget {
     }
 
     fn refresh_model_display(&mut self) {
-        let effective = self.effective_collaboration_mode();
-        self.session_header.set_model(effective.model());
         // Keep composer paste affordances aligned with the currently effective model.
         self.sync_image_paste_enabled();
     }
@@ -6891,46 +6873,6 @@ impl ChatWidget {
         }
     }
 
-    /// Build a placeholder header cell while the session is configuring.
-    fn placeholder_session_header_cell(config: &Config) -> Box<dyn HistoryCell> {
-        let placeholder_style = Style::default().add_modifier(Modifier::DIM | Modifier::ITALIC);
-        Box::new(history_cell::SessionHeaderHistoryCell::new_with_style(
-            DEFAULT_MODEL_DISPLAY_NAME.to_string(),
-            placeholder_style,
-            None,
-            config.cwd.clone(),
-            CODEX_CLI_VERSION,
-        ))
-    }
-
-    /// Merge the real session info cell with any placeholder header to avoid double boxes.
-    fn apply_session_info_cell(&mut self, cell: history_cell::SessionInfoCell) {
-        let mut session_info_cell = Some(Box::new(cell) as Box<dyn HistoryCell>);
-        let merged_header = if let Some(active) = self.active_cell.take() {
-            if active
-                .as_any()
-                .is::<history_cell::SessionHeaderHistoryCell>()
-            {
-                // Reuse the existing placeholder header to avoid rendering two boxes.
-                if let Some(cell) = session_info_cell.take() {
-                    self.active_cell = Some(cell);
-                }
-                true
-            } else {
-                self.active_cell = Some(active);
-                false
-            }
-        } else {
-            false
-        };
-
-        self.flush_active_cell();
-
-        if !merged_header && let Some(cell) = session_info_cell {
-            self.add_boxed_history(cell);
-        }
-    }
-
     pub(crate) fn add_info_message(&mut self, message: String, hint: Option<String>) {
         self.add_to_history(history_cell::new_info_event(message, hint));
         self.request_redraw();

codex-rs/tui/src/chatwidget/session_header.rs

@@ -1,16 +0,0 @@
-pub(crate) struct SessionHeader {
-    model: String,
-}
-
-impl SessionHeader {
-    pub(crate) fn new(model: String) -> Self {
-        Self { model }
-    }
-
-    /// Updates the header's model text.
-    pub(crate) fn set_model(&mut self, model: &str) {
-        if self.model != model {
-            self.model = model.to_string();
-        }
-    }
-}

codex-rs/tui/src/chatwidget/tests.rs

@@ -1657,7 +1657,6 @@ async fn make_chatwidget_manual(
         auth_manager,
         models_manager,
         otel_manager,
-        session_header: SessionHeader::new(resolved_model.clone()),
         initial_user_message: None,
         token_info: None,
         rate_limit_snapshots_by_limit_id: BTreeMap::new(),

codex-rs/tui/src/history_cell.rs

@@ -1020,46 +1020,32 @@ impl HistoryCell for TooltipHistoryCell {
     }
 }
 
-#[derive(Debug)]
-pub struct SessionInfoCell(CompositeHistoryCell);
+pub(crate) fn new_session_info_body(
+    config: &Config,
+    requested_model: &str,
+    event: &SessionConfiguredEvent,
+    is_first_event: bool,
+    auth_plan: Option<PlanType>,
+) -> Option<Box<dyn HistoryCell>> {
+    let parts = session_info_body_parts(config, requested_model, event, is_first_event, auth_plan);
 
-impl HistoryCell for SessionInfoCell {
-    fn display_lines(&self, width: u16) -> Vec<Line<'static>> {
-        self.0.display_lines(width)
-    }
-
-    fn desired_height(&self, width: u16) -> u16 {
-        self.0.desired_height(width)
-    }
-
-    fn transcript_lines(&self, width: u16) -> Vec<Line<'static>> {
-        self.0.transcript_lines(width)
+    match parts.len() {
+        0 => None,
+        1 => parts.into_iter().next(),
+        _ => Some(Box::new(CompositeHistoryCell::new(parts))),
     }
 }
 
-pub(crate) fn new_session_info(
+fn session_info_body_parts(
     config: &Config,
     requested_model: &str,
-    event: SessionConfiguredEvent,
+    event: &SessionConfiguredEvent,
     is_first_event: bool,
     auth_plan: Option<PlanType>,
-) -> SessionInfoCell {
-    let SessionConfiguredEvent {
-        model,
-        reasoning_effort,
-        ..
-    } = event;
-    // Header box rendered as history (so it appears at the very top)
-    let header = SessionHeaderHistoryCell::new(
-        model.clone(),
-        reasoning_effort,
-        config.cwd.clone(),
-        CODEX_CLI_VERSION,
-    );
-    let mut parts: Vec<Box<dyn HistoryCell>> = vec![Box::new(header)];
+) -> Vec<Box<dyn HistoryCell>> {
+    let mut parts: Vec<Box<dyn HistoryCell>> = Vec::new();
 
     if is_first_event {
-        // Help lines below the header (new copy and list)
         let help_lines: Vec<Line<'static>> = vec![
             "  To get started, describe a task or try one of these commands:"
                 .dim()
@@ -1091,7 +1077,6 @@ pub(crate) fn new_session_info(
                 " - review any changes and find issues".dim(),
             ]),
         ];
-
         parts.push(Box::new(PlainHistoryCell { lines: help_lines }));
     } else {
         if config.show_tooltips
@@ -1099,17 +1084,17 @@ pub(crate) fn new_session_info(
         {
             parts.push(Box::new(tooltips));
         }
-        if requested_model != model {
+        if requested_model != event.model {
             let lines = vec![
                 "model changed:".magenta().bold().into(),
                 format!("requested: {requested_model}").into(),
-                format!("used: {model}").into(),
+                format!("used: {}", event.model).into(),
             ];
             parts.push(Box::new(PlainHistoryCell { lines }));
         }
     }
 
-    SessionInfoCell(CompositeHistoryCell { parts })
+    parts
 }
 
 pub(crate) fn new_user_prompt(
@@ -1204,6 +1189,10 @@ impl SessionHeaderHistoryCell {
             ReasoningEffortConfig::None => "none",
         })
     }
+
+    pub(crate) fn is_loading_placeholder(&self) -> bool {
+        self.model == "loading"
+    }
 }
 
 impl HistoryCell for SessionHeaderHistoryCell {

codex-rs/tui/src/insert_history.rs

@@ -126,43 +126,7 @@ where
 
     for line in wrapped {
         queue!(writer, Print("\r\n"))?;
-        // URL lines can be wider than the terminal and will
-        // character-wrap onto continuation rows. Pre-clear those rows
-        // so stale content from a previously longer line is erased.
-        let physical_rows = line.width().max(1).div_ceil(wrap_width);
-        if physical_rows > 1 {
-            queue!(writer, SavePosition)?;
-            for _ in 1..physical_rows {
-                queue!(writer, MoveDown(1), MoveToColumn(0))?;
-                queue!(writer, Clear(ClearType::UntilNewLine))?;
-            }
-            queue!(writer, RestorePosition)?;
-        }
-        queue!(
-            writer,
-            SetColors(Colors::new(
-                line.style
-                    .fg
-                    .map(std::convert::Into::into)
-                    .unwrap_or(CColor::Reset),
-                line.style
-                    .bg
-                    .map(std::convert::Into::into)
-                    .unwrap_or(CColor::Reset)
-            ))
-        )?;
-        queue!(writer, Clear(ClearType::UntilNewLine))?;
-        // Merge line-level style into each span so that ANSI colors reflect
-        // line styles (e.g., blockquotes with green fg).
-        let merged_spans: Vec<Span> = line
-            .spans
-            .iter()
-            .map(|s| Span {
-                style: s.style.patch(line.style),
-                content: s.content.clone(),
-            })
-            .collect();
-        write_spans(writer, merged_spans.iter())?;
+        write_line(writer, &line, wrap_width)?;
     }
 
     queue!(writer, ResetScrollRegion)?;
@@ -181,6 +145,36 @@ where
     Ok(())
 }
 
+pub fn replace_top_visible_history_lines<B>(
+    terminal: &mut crate::custom_terminal::Terminal<B>,
+    lines: Vec<Line>,
+) -> io::Result<()>
+where
+    B: Backend + Write,
+{
+    if lines.is_empty() {
+        return Ok(());
+    }
+
+    let top = terminal
+        .viewport_area
+        .top()
+        .saturating_sub(terminal.visible_history_rows());
+    let wrap_width = terminal.viewport_area.width.max(1) as usize;
+    let last_cursor_pos = terminal.last_known_cursor_pos;
+    let writer = terminal.backend_mut();
+
+    for (index, line) in lines.iter().enumerate() {
+        let y = top.saturating_add(index as u16);
+        queue!(writer, MoveTo(0, y))?;
+        write_line(writer, line, wrap_width)?;
+    }
+
+    queue!(writer, MoveTo(last_cursor_pos.x, last_cursor_pos.y))?;
+    std::io::Write::flush(writer)?;
+    Ok(())
+}
+
 #[derive(Debug, Clone, PartialEq, Eq)]
 pub struct SetScrollRegion(pub std::ops::Range<u16>);
 
@@ -329,6 +323,43 @@ where
     )
 }
 
+fn write_line(mut writer: &mut impl Write, line: &Line<'_>, wrap_width: usize) -> io::Result<()> {
+    // URL lines can be wider than the terminal and will character-wrap onto continuation rows.
+    // Pre-clear those rows so stale content from a previously longer line is erased.
+    let physical_rows = line.width().max(1).div_ceil(wrap_width);
+    if physical_rows > 1 {
+        queue!(writer, SavePosition)?;
+        for _ in 1..physical_rows {
+            queue!(writer, MoveDown(1), MoveToColumn(0))?;
+            queue!(writer, Clear(ClearType::UntilNewLine))?;
+        }
+        queue!(writer, RestorePosition)?;
+    }
+    queue!(
+        writer,
+        SetColors(Colors::new(
+            line.style
+                .fg
+                .map(std::convert::Into::into)
+                .unwrap_or(CColor::Reset),
+            line.style
+                .bg
+                .map(std::convert::Into::into)
+                .unwrap_or(CColor::Reset)
+        ))
+    )?;
+    queue!(writer, Clear(ClearType::UntilNewLine))?;
+    let merged_spans: Vec<Span> = line
+        .spans
+        .iter()
+        .map(|s| Span {
+            style: s.style.patch(line.style),
+            content: s.content.clone(),
+        })
+        .collect();
+    write_spans(&mut writer, merged_spans.iter())
+}
+
 #[cfg(test)]
 mod tests {
     use super::*;

codex-rs/tui/src/tui.rs

@@ -445,6 +445,16 @@ impl Tui {
         self.frame_requester().schedule_frame();
     }
 
+    pub fn replace_top_visible_history_lines(&mut self, lines: Vec<Line<'static>>) -> Result<()> {
+        let line_count = lines.len();
+        if self.terminal.visible_history_rows() >= line_count as u16 {
+            crate::insert_history::replace_top_visible_history_lines(&mut self.terminal, lines)?;
+        } else if self.pending_history_lines.len() >= line_count {
+            self.pending_history_lines.splice(0..line_count, lines);
+        }
+        Ok(())
+    }
+
     pub fn clear_pending_history_lines(&mut self) {
         self.pending_history_lines.clear();
     }