feat(ui): add configurable role label display and syntax highlighting support

- Introduce `RoleLabelDisplay` enum (inline, above, none) and integrate it into UI rendering and message formatting.
- Replace `show_role_labels` boolean with `role_label_mode` across config, formatter, session, and TUI components.
- Add `syntax_highlighting` boolean to UI settings with default `false` and support in message rendering.
- Update configuration schema version to 1.3.0 and provide deserialization handling for legacy boolean values.
- Extend theme definitions with code block styling fields (background, border, text, keyword, string, comment) and default values in `Theme`.
- Adjust related modules (`formatting.rs`, `ui.rs`, `session.rs`, `chat_app.rs`) to use the new settings and theme fields.

crates/owlen-core/src/config.rs

@@ -1,8 +1,11 @@
 use crate::ProviderConfig;
 use crate::Result;
 use crate::mode::ModeConfig;
+use crate::ui::RoleLabelDisplay;
+use serde::de::{self, Deserializer, Visitor};
 use serde::{Deserialize, Serialize};
 use std::collections::HashMap;
+use std::fmt;
 use std::fs;
 use std::path::{Path, PathBuf};
 use std::time::Duration;
@@ -11,7 +14,7 @@ use std::time::Duration;
 pub const DEFAULT_CONFIG_PATH: &str = "~/.config/owlen/config.toml";
 
 /// Current schema version written to `config.toml`.
-pub const CONFIG_SCHEMA_VERSION: &str = "1.2.0";
+pub const CONFIG_SCHEMA_VERSION: &str = "1.3.0";
 
 /// Core configuration shared by all OWLEN clients
 #[derive(Debug, Clone, Serialize, Deserialize)]
@@ -700,8 +703,13 @@ pub struct UiSettings {
     pub word_wrap: bool,
     #[serde(default = "UiSettings::default_max_history_lines")]
     pub max_history_lines: usize,
-    #[serde(default = "UiSettings::default_show_role_labels")]
+    #[serde(
-    pub show_role_labels: bool,
+        rename = "role_label",
+        alias = "show_role_labels",
+        default = "UiSettings::default_role_label_mode",
+        deserialize_with = "UiSettings::deserialize_role_label_mode"
+    )]
+    pub role_label_mode: RoleLabelDisplay,
     #[serde(default = "UiSettings::default_wrap_column")]
     pub wrap_column: u16,
     #[serde(default = "UiSettings::default_show_onboarding")]
@@ -712,6 +720,8 @@ pub struct UiSettings {
     pub scrollback_lines: usize,
     #[serde(default = "UiSettings::default_show_cursor_outside_insert")]
     pub show_cursor_outside_insert: bool,
+    #[serde(default = "UiSettings::default_syntax_highlighting")]
+    pub syntax_highlighting: bool,
 }
 
 impl UiSettings {
@@ -727,8 +737,8 @@ impl UiSettings {
         2000
     }
 
-    fn default_show_role_labels() -> bool {
+    const fn default_role_label_mode() -> RoleLabelDisplay {
-        true
+        RoleLabelDisplay::Above
     }
 
     fn default_wrap_column() -> u16 {
@@ -750,6 +760,62 @@ impl UiSettings {
     const fn default_show_cursor_outside_insert() -> bool {
         false
     }
+
+    const fn default_syntax_highlighting() -> bool {
+        false
+    }
+
+    fn deserialize_role_label_mode<'de, D>(
+        deserializer: D,
+    ) -> std::result::Result<RoleLabelDisplay, D::Error>
+    where
+        D: Deserializer<'de>,
+    {
+        struct RoleLabelModeVisitor;
+
+        impl<'de> Visitor<'de> for RoleLabelModeVisitor {
+            type Value = RoleLabelDisplay;
+
+            fn expecting(&self, f: &mut fmt::Formatter) -> fmt::Result {
+                f.write_str("`inline`, `above`, `none`, or a legacy boolean")
+            }
+
+            fn visit_str<E>(self, v: &str) -> std::result::Result<Self::Value, E>
+            where
+                E: de::Error,
+            {
+                match v.trim().to_ascii_lowercase().as_str() {
+                    "inline" => Ok(RoleLabelDisplay::Inline),
+                    "above" => Ok(RoleLabelDisplay::Above),
+                    "none" => Ok(RoleLabelDisplay::None),
+                    other => Err(de::Error::unknown_variant(
+                        other,
+                        &["inline", "above", "none"],
+                    )),
+                }
+            }
+
+            fn visit_string<E>(self, v: String) -> std::result::Result<Self::Value, E>
+            where
+                E: de::Error,
+            {
+                self.visit_str(&v)
+            }
+
+            fn visit_bool<E>(self, v: bool) -> std::result::Result<Self::Value, E>
+            where
+                E: de::Error,
+            {
+                if v {
+                    Ok(RoleLabelDisplay::Above)
+                } else {
+                    Ok(RoleLabelDisplay::None)
+                }
+            }
+        }
+
+        deserializer.deserialize_any(RoleLabelModeVisitor)
+    }
 }
 
 impl Default for UiSettings {
@@ -758,12 +824,13 @@ impl Default for UiSettings {
             theme: Self::default_theme(),
             word_wrap: Self::default_word_wrap(),
             max_history_lines: Self::default_max_history_lines(),
-            show_role_labels: Self::default_show_role_labels(),
+            role_label_mode: Self::default_role_label_mode(),
             wrap_column: Self::default_wrap_column(),
             show_onboarding: Self::default_show_onboarding(),
             input_max_rows: Self::default_input_max_rows(),
             scrollback_lines: Self::default_scrollback_lines(),
             show_cursor_outside_insert: Self::default_show_cursor_outside_insert(),
+            syntax_highlighting: Self::default_syntax_highlighting(),
         }
     }
 }
@@ -919,7 +986,9 @@ mod tests {
 
     #[test]
     fn expand_provider_env_vars_resolves_api_key() {
+        unsafe {
             std::env::set_var("OWLEN_TEST_API_KEY", "super-secret");
+        }
 
         let mut config = Config::default();
         if let Some(ollama) = config.providers.get_mut("ollama") {
@@ -935,12 +1004,16 @@ mod tests {
             Some("super-secret")
         );
 
+        unsafe {
             std::env::remove_var("OWLEN_TEST_API_KEY");
         }
+    }
 
     #[test]
     fn expand_provider_env_vars_errors_for_missing_variable() {
+        unsafe {
             std::env::remove_var("OWLEN_TEST_MISSING");
+        }
 
         let mut config = Config::default();
         if let Some(ollama) = config.providers.get_mut("ollama") {

crates/owlen-core/src/formatting.rs

@@ -1,19 +1,20 @@
 use crate::types::Message;
+use crate::ui::RoleLabelDisplay;
 
 /// Formats messages for display across different clients.
 #[derive(Debug, Clone)]
 pub struct MessageFormatter {
     wrap_width: usize,
-    show_role_labels: bool,
+    role_label_mode: RoleLabelDisplay,
     preserve_empty_lines: bool,
 }
 
 impl MessageFormatter {
     /// Create a new formatter
-    pub fn new(wrap_width: usize, show_role_labels: bool) -> Self {
+    pub fn new(wrap_width: usize, role_label_mode: RoleLabelDisplay) -> Self {
         Self {
             wrap_width: wrap_width.max(20),
-            show_role_labels,
+            role_label_mode,
             preserve_empty_lines: false,
         }
     }
@@ -29,9 +30,19 @@ impl MessageFormatter {
         self.wrap_width = width.max(20);
     }
 
-    /// Whether role labels should be shown alongside messages
+    /// The configured role label layout preference.
+    pub fn role_label_mode(&self) -> RoleLabelDisplay {
+        self.role_label_mode
+    }
+
+    /// Whether any role label should be shown alongside messages.
     pub fn show_role_labels(&self) -> bool {
-        self.show_role_labels
+        !matches!(self.role_label_mode, RoleLabelDisplay::None)
+    }
+
+    /// Update the role label layout preference.
+    pub fn set_role_label_mode(&mut self, mode: RoleLabelDisplay) {
+        self.role_label_mode = mode;
     }
 
     pub fn format_message(&self, message: &Message) -> Vec<String> {

crates/owlen-core/src/providers/ollama.rs

@@ -1031,13 +1031,17 @@ mod tests {
 
     #[test]
     fn resolve_api_key_expands_env_var() {
+        unsafe {
             std::env::set_var("OLLAMA_TEST_KEY", "secret");
+        }
         assert_eq!(
             resolve_api_key(Some("${OLLAMA_TEST_KEY}".into())),
             Some("secret".into())
         );
+        unsafe {
             std::env::remove_var("OLLAMA_TEST_KEY");
         }
+    }
 
     #[test]
     fn normalize_base_url_removes_api_path() {

crates/owlen-core/src/session.rs

@@ -16,7 +16,7 @@ use crate::storage::{SessionMeta, StorageManager};
 use crate::types::{
     ChatParameters, ChatRequest, ChatResponse, Conversation, Message, ModelInfo, ToolCall,
 };
-use crate::ui::UiController;
+use crate::ui::{RoleLabelDisplay, UiController};
 use crate::validation::{SchemaValidator, get_builtin_schemas};
 use crate::{ChatStream, Provider};
 use crate::{
@@ -264,7 +264,7 @@ impl SessionController {
         );
         let formatter = MessageFormatter::new(
             config_guard.ui.wrap_column as usize,
-            config_guard.ui.show_role_labels,
+            config_guard.ui.role_label_mode,
         )
         .with_preserve_empty(config_guard.ui.word_wrap);
         let input_buffer = InputBuffer::new(
@@ -351,6 +351,10 @@ impl SessionController {
         self.formatter.set_wrap_width(width);
     }
 
+    pub fn set_role_label_mode(&mut self, mode: RoleLabelDisplay) {
+        self.formatter.set_role_label_mode(mode);
+    }
+
     // Asynchronous access to the configuration (used internally).
     pub async fn config_async(&self) -> tokio::sync::MutexGuard<'_, Config> {
         self.config.lock().await

crates/owlen-core/src/theme.rs

@@ -116,6 +116,42 @@ pub struct Theme {
     #[serde(serialize_with = "serialize_color")]
     pub cursor: Color,
 
+    /// Code block background color
+    #[serde(default = "Theme::default_code_block_background")]
+    #[serde(deserialize_with = "deserialize_color")]
+    #[serde(serialize_with = "serialize_color")]
+    pub code_block_background: Color,
+
+    /// Code block border color
+    #[serde(default = "Theme::default_code_block_border")]
+    #[serde(deserialize_with = "deserialize_color")]
+    #[serde(serialize_with = "serialize_color")]
+    pub code_block_border: Color,
+
+    /// Code block text color
+    #[serde(default = "Theme::default_code_block_text")]
+    #[serde(deserialize_with = "deserialize_color")]
+    #[serde(serialize_with = "serialize_color")]
+    pub code_block_text: Color,
+
+    /// Code block keyword color
+    #[serde(default = "Theme::default_code_block_keyword")]
+    #[serde(deserialize_with = "deserialize_color")]
+    #[serde(serialize_with = "serialize_color")]
+    pub code_block_keyword: Color,
+
+    /// Code block string literal color
+    #[serde(default = "Theme::default_code_block_string")]
+    #[serde(deserialize_with = "deserialize_color")]
+    #[serde(serialize_with = "serialize_color")]
+    pub code_block_string: Color,
+
+    /// Code block comment color
+    #[serde(default = "Theme::default_code_block_comment")]
+    #[serde(deserialize_with = "deserialize_color")]
+    #[serde(serialize_with = "serialize_color")]
+    pub code_block_comment: Color,
+
     /// Placeholder text color
     #[serde(deserialize_with = "deserialize_color")]
     #[serde(serialize_with = "serialize_color")]
@@ -217,6 +253,30 @@ impl Default for Theme {
 }
 
 impl Theme {
+    const fn default_code_block_background() -> Color {
+        Color::Black
+    }
+
+    const fn default_code_block_border() -> Color {
+        Color::Gray
+    }
+
+    const fn default_code_block_text() -> Color {
+        Color::White
+    }
+
+    const fn default_code_block_keyword() -> Color {
+        Color::Yellow
+    }
+
+    const fn default_code_block_string() -> Color {
+        Color::LightGreen
+    }
+
+    const fn default_code_block_comment() -> Color {
+        Color::DarkGray
+    }
+
     const fn default_agent_thought() -> Color {
         Color::LightBlue
     }
@@ -430,6 +490,12 @@ fn default_dark() -> Theme {
         selection_bg: Color::LightBlue,
         selection_fg: Color::Black,
         cursor: Color::Magenta,
+        code_block_background: Color::Rgb(25, 25, 25),
+        code_block_border: Color::LightMagenta,
+        code_block_text: Color::White,
+        code_block_keyword: Color::Yellow,
+        code_block_string: Color::LightGreen,
+        code_block_comment: Color::Gray,
         placeholder: Color::DarkGray,
         error: Color::Red,
         info: Color::LightGreen,
@@ -473,6 +539,12 @@ fn default_light() -> Theme {
         selection_bg: Color::Rgb(164, 200, 240),
         selection_fg: Color::Black,
         cursor: Color::Rgb(217, 95, 2),
+        code_block_background: Color::Rgb(245, 245, 245),
+        code_block_border: Color::Rgb(142, 68, 173),
+        code_block_text: Color::Black,
+        code_block_keyword: Color::Rgb(181, 137, 0),
+        code_block_string: Color::Rgb(46, 139, 87),
+        code_block_comment: Color::Gray,
         placeholder: Color::Gray,
         error: Color::Rgb(192, 57, 43),
         info: Color::Green,
@@ -516,6 +588,12 @@ fn gruvbox() -> Theme {
         selection_bg: Color::Rgb(80, 73, 69),
         selection_fg: Color::Rgb(235, 219, 178),
         cursor: Color::Rgb(254, 128, 25),
+        code_block_background: Color::Rgb(60, 56, 54),
+        code_block_border: Color::Rgb(124, 111, 100),
+        code_block_text: Color::Rgb(235, 219, 178),
+        code_block_keyword: Color::Rgb(250, 189, 47),
+        code_block_string: Color::Rgb(142, 192, 124),
+        code_block_comment: Color::Rgb(124, 111, 100),
         placeholder: Color::Rgb(102, 92, 84),
         error: Color::Rgb(251, 73, 52), // #fb4934
         info: Color::Rgb(184, 187, 38),
@@ -559,6 +637,12 @@ fn dracula() -> Theme {
         selection_bg: Color::Rgb(68, 71, 90),
         selection_fg: Color::Rgb(248, 248, 242),
         cursor: Color::Rgb(255, 121, 198),
+        code_block_background: Color::Rgb(68, 71, 90),
+        code_block_border: Color::Rgb(189, 147, 249),
+        code_block_text: Color::Rgb(248, 248, 242),
+        code_block_keyword: Color::Rgb(255, 121, 198),
+        code_block_string: Color::Rgb(80, 250, 123),
+        code_block_comment: Color::Rgb(98, 114, 164),
         placeholder: Color::Rgb(98, 114, 164),
         error: Color::Rgb(255, 85, 85), // #ff5555
         info: Color::Rgb(80, 250, 123),
@@ -602,6 +686,12 @@ fn solarized() -> Theme {
         selection_bg: Color::Rgb(7, 54, 66),
         selection_fg: Color::Rgb(147, 161, 161),
         cursor: Color::Rgb(211, 54, 130),
+        code_block_background: Color::Rgb(7, 54, 66),
+        code_block_border: Color::Rgb(38, 139, 210),
+        code_block_text: Color::Rgb(147, 161, 161),
+        code_block_keyword: Color::Rgb(181, 137, 0),
+        code_block_string: Color::Rgb(133, 153, 0),
+        code_block_comment: Color::Rgb(88, 110, 117),
         placeholder: Color::Rgb(88, 110, 117),
         error: Color::Rgb(220, 50, 47), // #dc322f (red)
         info: Color::Rgb(133, 153, 0),
@@ -645,6 +735,12 @@ fn midnight_ocean() -> Theme {
         selection_bg: Color::Rgb(56, 139, 253),
         selection_fg: Color::Rgb(13, 17, 23),
         cursor: Color::Rgb(246, 140, 245),
+        code_block_background: Color::Rgb(22, 27, 34),
+        code_block_border: Color::Rgb(88, 166, 255),
+        code_block_text: Color::Rgb(192, 202, 245),
+        code_block_keyword: Color::Rgb(255, 212, 59),
+        code_block_string: Color::Rgb(158, 206, 106),
+        code_block_comment: Color::Rgb(110, 118, 129),
         placeholder: Color::Rgb(110, 118, 129),
         error: Color::Rgb(248, 81, 73),
         info: Color::Rgb(158, 206, 106),
@@ -688,6 +784,12 @@ fn rose_pine() -> Theme {
         selection_bg: Color::Rgb(64, 61, 82),
         selection_fg: Color::Rgb(224, 222, 244),
         cursor: Color::Rgb(235, 111, 146),
+        code_block_background: Color::Rgb(38, 35, 58),
+        code_block_border: Color::Rgb(235, 111, 146),
+        code_block_text: Color::Rgb(224, 222, 244),
+        code_block_keyword: Color::Rgb(246, 193, 119),
+        code_block_string: Color::Rgb(156, 207, 216),
+        code_block_comment: Color::Rgb(110, 106, 134),
         placeholder: Color::Rgb(110, 106, 134),
         error: Color::Rgb(235, 111, 146),
         info: Color::Rgb(156, 207, 216),
@@ -731,6 +833,12 @@ fn monokai() -> Theme {
         selection_bg: Color::Rgb(117, 113, 94),
         selection_fg: Color::Rgb(248, 248, 242),
         cursor: Color::Rgb(249, 38, 114),
+        code_block_background: Color::Rgb(50, 51, 46),
+        code_block_border: Color::Rgb(249, 38, 114),
+        code_block_text: Color::Rgb(248, 248, 242),
+        code_block_keyword: Color::Rgb(230, 219, 116),
+        code_block_string: Color::Rgb(166, 226, 46),
+        code_block_comment: Color::Rgb(117, 113, 94),
         placeholder: Color::Rgb(117, 113, 94),
         error: Color::Rgb(249, 38, 114),
         info: Color::Rgb(166, 226, 46),
@@ -774,6 +882,12 @@ fn material_dark() -> Theme {
         selection_bg: Color::Rgb(84, 110, 122),
         selection_fg: Color::Rgb(238, 255, 255),
         cursor: Color::Rgb(255, 204, 0),
+        code_block_background: Color::Rgb(33, 43, 48),
+        code_block_border: Color::Rgb(128, 203, 196),
+        code_block_text: Color::Rgb(238, 255, 255),
+        code_block_keyword: Color::Rgb(255, 203, 107),
+        code_block_string: Color::Rgb(195, 232, 141),
+        code_block_comment: Color::Rgb(84, 110, 122),
         placeholder: Color::Rgb(84, 110, 122),
         error: Color::Rgb(240, 113, 120),
         info: Color::Rgb(195, 232, 141),
@@ -817,6 +931,12 @@ fn material_light() -> Theme {
         selection_bg: Color::Rgb(176, 190, 197),
         selection_fg: Color::Rgb(33, 33, 33),
         cursor: Color::Rgb(194, 24, 91),
+        code_block_background: Color::Rgb(248, 249, 250),
+        code_block_border: Color::Rgb(0, 150, 136),
+        code_block_text: Color::Rgb(33, 33, 33),
+        code_block_keyword: Color::Rgb(245, 124, 0),
+        code_block_string: Color::Rgb(56, 142, 60),
+        code_block_comment: Color::Rgb(144, 164, 174),
         placeholder: Color::Rgb(144, 164, 174),
         error: Color::Rgb(211, 47, 47),
         info: Color::Rgb(56, 142, 60),
@@ -860,6 +980,12 @@ fn grayscale_high_contrast() -> Theme {
         selection_bg: Color::Rgb(240, 240, 240),
         selection_fg: Color::Black,
         cursor: Color::White,
+        code_block_background: Color::Rgb(15, 15, 15),
+        code_block_border: Color::White,
+        code_block_text: Color::Rgb(247, 247, 247),
+        code_block_keyword: Color::Rgb(204, 204, 204),
+        code_block_string: Color::Rgb(214, 214, 214),
+        code_block_comment: Color::Rgb(122, 122, 122),
         placeholder: Color::Rgb(122, 122, 122),
         error: Color::White,
         info: Color::Rgb(200, 200, 200),

crates/owlen-core/src/ui.rs

@@ -18,6 +18,17 @@ pub use crate::state::AutoScroll;
 /// Visual selection state for text selection
 pub use crate::state::VisualSelection;
 
+use serde::{Deserialize, Serialize};
+
+/// How role labels should be rendered alongside chat messages.
+#[derive(Debug, Clone, Copy, PartialEq, Eq, Serialize, Deserialize)]
+#[serde(rename_all = "lowercase")]
+pub enum RoleLabelDisplay {
+    Inline,
+    Above,
+    None,
+}
+
 /// Extract text from a selection range in a list of lines
 pub fn extract_text_from_selection(
     lines: &[String],

crates/owlen-tui/src/ui.rs

@@ -12,7 +12,7 @@ use crate::chat_app::{ChatApp, HELP_TAB_COUNT, MessageRenderContext, ModelSelect
 use owlen_core::model::DetailedModelInfo;
 use owlen_core::theme::Theme;
 use owlen_core::types::{ModelInfo, Role};
-use owlen_core::ui::{FocusedPanel, InputMode};
+use owlen_core::ui::{FocusedPanel, InputMode, RoleLabelDisplay};
 
 const PRIVACY_TAB_INDEX: usize = HELP_TAB_COUNT - 1;
 
@@ -687,7 +687,7 @@ fn render_messages(frame: &mut Frame<'_>, area: Rect, app: &mut ChatApp) {
 
     // Build the lines for messages using cached rendering
     let mut lines: Vec<Line<'static>> = Vec::new();
-    let show_role_labels = formatter.show_role_labels();
+    let role_label_mode = formatter.role_label_mode();
     for message_index in 0..total_messages {
         let is_streaming = {
             let conversation = app.conversation();
@@ -701,12 +701,13 @@ fn render_messages(frame: &mut Frame<'_>, area: Rect, app: &mut ChatApp) {
             message_index,
             MessageRenderContext::new(
                 &mut formatter,
-                show_role_labels,
+                role_label_mode,
                 content_width as usize,
                 message_index + 1 == total_messages,
                 is_streaming,
                 app.get_loading_indicator(),
                 &theme,
+                app.should_highlight_code(),
             ),
         );
         lines.extend(message_lines);
@@ -729,6 +730,37 @@ fn render_messages(frame: &mut Frame<'_>, area: Rect, app: &mut ChatApp) {
     };
 
     if app.get_loading_indicator() != "" && last_message_is_user {
+        match role_label_mode {
+            RoleLabelDisplay::Inline => {
+                let (emoji, title) = crate::chat_app::role_label_parts(&Role::Assistant);
+                let inline_label = format!("{emoji} {title}:");
+                let label_width = UnicodeWidthStr::width(inline_label.as_str());
+                let max_label_width = crate::chat_app::max_inline_label_width();
+                let padding = max_label_width.saturating_sub(label_width);
+
+                let mut loading_spans = vec![
+                    Span::raw(format!("{emoji} ")),
+                    Span::styled(
+                        format!("{title}:"),
+                        Style::default()
+                            .fg(theme.assistant_message_role)
+                            .add_modifier(Modifier::BOLD),
+                    ),
+                ];
+
+                if padding > 0 {
+                    loading_spans.push(Span::raw(" ".repeat(padding)));
+                }
+
+                loading_spans.push(Span::raw(" "));
+                loading_spans.push(Span::styled(
+                    app.get_loading_indicator().to_string(),
+                    Style::default().fg(theme.info),
+                ));
+
+                lines.push(Line::from(loading_spans));
+            }
+            _ => {
                 let loading_spans = vec![
                     Span::raw("🤖 "),
                     Span::styled(
@@ -744,6 +776,8 @@ fn render_messages(frame: &mut Frame<'_>, area: Rect, app: &mut ChatApp) {
                 ];
                 lines.push(Line::from(loading_spans));
             }
+        }
+    }
 
     if lines.is_empty() {
         lines.push(Line::from("No messages yet. Press 'i' to start typing."));

docs/configuration.md

@@ -58,8 +58,8 @@ These settings customize the look and feel of the terminal interface.
 -   `max_history_lines` (integer, default: `2000`)
     The maximum number of lines to keep in the scrollback buffer for the chat history.
 
--   `show_role_labels` (boolean, default: `true`)
+-   `role_label` (string, default: `"above"`)
-    Whether to show the `user` and `bot` role labels next to messages.
+    Controls how sender labels are rendered next to messages. Valid values are `"above"` (label on its own line), `"inline"` (label shares the first line of the message), and `"none"` (no label).
 
 -   `wrap_column` (integer, default: `100`)
     The column at which to wrap text if `word_wrap` is enabled.
@@ -70,6 +70,9 @@ These settings customize the look and feel of the terminal interface.
 -   `scrollback_lines` (integer, default: `2000`)
     The maximum number of rendered lines the chat view keeps in memory. Set to `0` to disable trimming entirely if you prefer unlimited history.
 
+-   `syntax_highlighting` (boolean, default: `false`)
+    Enables lightweight syntax highlighting inside fenced code blocks when the terminal supports 256-color output.
+
 ## Storage Settings (`[storage]`)
 
 These settings control how conversations are saved and loaded.

themes/README.md

@@ -55,6 +55,14 @@ selection_bg = "#0000ff"      # Selection background
 selection_fg = "#ffffff"      # Selection foreground
 cursor = "#ff0080"            # Cursor color
 
+# Code block styling
+code_block_background = "#111111"
+code_block_border = "#ff00ff"
+code_block_text = "#ffffff"
+code_block_keyword = "#ffff00"
+code_block_string = "#00ff00"
+code_block_comment = "#808080"
+
 # Status colors
 error = "#ff0000"             # Error messages
 info = "#00ff00"              # Info/success messages

themes/ansi-basic.toml

@@ -19,6 +19,12 @@ mode_command = "yellow"
 selection_bg = "blue"
 selection_fg = "white"
 cursor = "white"
+code_block_background = "black"
+code_block_border = "cyan"
+code_block_text = "white"
+code_block_keyword = "yellow"
+code_block_string = "green"
+code_block_comment = "darkgray"
 placeholder = "darkgray"
 error = "red"
 info = "green"

themes/default_dark.toml

@@ -19,6 +19,12 @@ mode_command = "yellow"
 selection_bg = "lightblue"
 selection_fg = "black"
 cursor = "magenta"
+code_block_background = "#191919"
+code_block_border = "lightmagenta"
+code_block_text = "white"
+code_block_keyword = "yellow"
+code_block_string = "lightgreen"
+code_block_comment = "gray"
 placeholder = "darkgray"
 error = "red"
 info = "lightgreen"

themes/default_light.toml

@@ -19,6 +19,12 @@ mode_command = "#b58900"
 selection_bg = "#a4c8f0"
 selection_fg = "black"
 cursor = "#d95f02"
+code_block_background = "#f5f5f5"
+code_block_border = "#009688"
+code_block_text = "black"
+code_block_keyword = "#b58900"
+code_block_string = "#388e3c"
+code_block_comment = "#90a4ae"
 placeholder = "gray"
 error = "#c0392b"
 info = "green"

themes/dracula.toml

@@ -19,6 +19,12 @@ mode_command = "#f1fa8c"
 selection_bg = "#44475a"
 selection_fg = "#f8f8f2"
 cursor = "#ff79c6"
+code_block_background = "#44475a"
+code_block_border = "#bd93f9"
+code_block_text = "#f8f8f2"
+code_block_keyword = "#ff79c6"
+code_block_string = "#50fa7b"
+code_block_comment = "#6272a4"
 placeholder = "#6272a4"
 error = "#ff5555"
 info = "#50fa7b"

themes/grayscale-high-contrast.toml

@@ -19,6 +19,12 @@ mode_command = "#d0d0d0"
 selection_bg = "#f0f0f0"
 selection_fg = "#000000"
 cursor = "#ffffff"
+code_block_background = "#0f0f0f"
+code_block_border = "#ffffff"
+code_block_text = "#f7f7f7"
+code_block_keyword = "#cccccc"
+code_block_string = "#d6d6d6"
+code_block_comment = "#7a7a7a"
 placeholder = "#7a7a7a"
 error = "#ffffff"
 info = "#c8c8c8"

themes/gruvbox.toml

@@ -19,6 +19,12 @@ mode_command = "#fabd2f"
 selection_bg = "#504945"
 selection_fg = "#ebdbb2"
 cursor = "#fe8019"
+code_block_background = "#3c3836"
+code_block_border = "#7c6f64"
+code_block_text = "#ebdbb2"
+code_block_keyword = "#fabd2f"
+code_block_string = "#8ec07c"
+code_block_comment = "#7c6f64"
 placeholder = "#665c54"
 error = "#fb4934"
 info = "#b8bb26"

themes/material-dark.toml

@@ -19,6 +19,12 @@ mode_command = "#ffcb6b"
 selection_bg = "#546e7a"
 selection_fg = "#eeffff"
 cursor = "#ffcc00"
+code_block_background = "#212b30"
+code_block_border = "#80cbc4"
+code_block_text = "#eeffff"
+code_block_keyword = "#ffcb6b"
+code_block_string = "#c3e88d"
+code_block_comment = "#546e7a"
 placeholder = "#546e7a"
 error = "#f07178"
 info = "#c3e88d"

themes/material-light.toml

@@ -19,6 +19,12 @@ mode_command = "#f57c00"
 selection_bg = "#b0bec5"
 selection_fg = "#212121"
 cursor = "#c2185b"
+code_block_background = "#f8f9fa"
+code_block_border = "#009688"
+code_block_text = "#212121"
+code_block_keyword = "#f57c00"
+code_block_string = "#388e3c"
+code_block_comment = "#90a4ae"
 placeholder = "#90a4ae"
 error = "#d32f2f"
 info = "#388e3c"

themes/midnight-ocean.toml

@@ -19,6 +19,12 @@ mode_command = "#ffd43b"
 selection_bg = "#388bfd"
 selection_fg = "#0d1117"
 cursor = "#f68cf5"
+code_block_background = "#161b22"
+code_block_border = "#58a6ff"
+code_block_text = "#c0caf5"
+code_block_keyword = "#ffd43b"
+code_block_string = "#9ece6a"
+code_block_comment = "#6e7681"
 placeholder = "#6e7681"
 error = "#f85149"
 info = "#9ece6a"

themes/monokai.toml

@@ -19,6 +19,12 @@ mode_command = "#e6db74"
 selection_bg = "#75715e"
 selection_fg = "#f8f8f2"
 cursor = "#f92672"
+code_block_background = "#32332e"
+code_block_border = "#f92672"
+code_block_text = "#f8f8f2"
+code_block_keyword = "#e6db74"
+code_block_string = "#a6e22e"
+code_block_comment = "#75715e"
 placeholder = "#75715e"
 error = "#f92672"
 info = "#a6e22e"

themes/rose-pine.toml

@@ -19,6 +19,12 @@ mode_command = "#f6c177"
 selection_bg = "#403d52"
 selection_fg = "#e0def4"
 cursor = "#eb6f92"
+code_block_background = "#26233a"
+code_block_border = "#eb6f92"
+code_block_text = "#e0def4"
+code_block_keyword = "#f6c177"
+code_block_string = "#9ccfd8"
+code_block_comment = "#6e6a86"
 placeholder = "#6e6a86"
 error = "#eb6f92"
 info = "#9ccfd8"

themes/solarized.toml

@@ -19,6 +19,12 @@ mode_command = "#b58900"
 selection_bg = "#073642"
 selection_fg = "#93a1a1"
 cursor = "#d33682"
+code_block_background = "#073642"
+code_block_border = "#268bd2"
+code_block_text = "#93a1a1"
+code_block_keyword = "#b58900"
+code_block_string = "#859900"
+code_block_comment = "#586e75"
 placeholder = "#586e75"
 error = "#dc322f"
 info = "#859900"