feat(tui): add markdown table parsing and rendering

Implemented full markdown table support:
- Parse tables with headers, rows, and alignment.
- Render tables as a grid when width permits, falling back to a stacked layout for narrow widths.
- Added helper structs (`ParsedTable`, `TableAlignment`) and functions for splitting rows, parsing alignments, column width constraints, cell alignment, and wrapping.
- Integrated table rendering into `render_markdown_lines`.
- Added unit tests for grid rendering and narrow fallback behavior.

Cargo.toml

@@ -9,6 +9,7 @@ members = [
     "crates/owlen-mcp-client",
     "crates/owlen-mcp-code-server",
     "crates/owlen-mcp-prompt-server",
+    "crates/owlen-markdown",
 ]
 exclude = []
 

README.md

@@ -90,7 +90,8 @@ OWLEN uses a modal, vim-inspired interface. Press `F1` (available from any mode)
 
 - **Normal Mode**: Navigate with `h/j/k/l`, `w/b`, `gg/G`.
 - **Editing Mode**: Enter with `i` or `a`. Send messages with `Enter`.
-- **Command Mode**: Enter with `:`. Access commands like `:quit`, `:save`, `:theme`.
+- **Command Mode**: Enter with `:`. Access commands like `:quit`, `:w`, `:session save`, `:theme`.
+- **Quick Exit**: Press `Ctrl+C` twice in Normal mode to quit quickly (first press still cancels active generations).
 - **Tutorial Command**: Type `:tutorial` any time for a quick summary of the most important keybindings.
 - **MCP Slash Commands**: Owlen auto-registers zero-argument MCP tools as slash commands—type `/mcp__github__list_prs` (for example) to pull remote context directly into the chat log.
 

crates/owlen-cli/src/cloud.rs

@@ -221,10 +221,11 @@ fn ensure_provider_entry(config: &mut Config, provider: &str, endpoint: &str) {
     if provider == "ollama"
         && config.providers.contains_key("ollama-cloud")
         && !config.providers.contains_key("ollama")
-        && let Some(mut legacy) = config.providers.remove("ollama-cloud")
     {
-        legacy.provider_type = "ollama".to_string();
-        config.providers.insert("ollama".to_string(), legacy);
+        if let Some(mut legacy) = config.providers.remove("ollama-cloud") {
+            legacy.provider_type = "ollama".to_string();
+            config.providers.insert("ollama".to_string(), legacy);
+        }
     }
 
     core_config::ensure_provider_config(config, provider);
@@ -315,8 +316,10 @@ fn unlock_vault(path: &Path) -> Result<encryption::VaultHandle> {
     use std::env;
 
     if path.exists() {
-        if let Ok(password) = env::var("OWLEN_MASTER_PASSWORD")
-            && !password.trim().is_empty()
+        if let Some(password) = env::var("OWLEN_MASTER_PASSWORD")
+            .ok()
+            .map(|value| value.trim().to_string())
+            .filter(|password| !password.is_empty())
         {
             return encryption::unlock_with_password(path.to_path_buf(), &password)
                 .context("Failed to unlock vault with OWLEN_MASTER_PASSWORD");
@@ -356,30 +359,31 @@ async fn hydrate_api_key(
     config: &mut Config,
     manager: Option<&Arc<CredentialManager>>,
 ) -> Result<Option<String>> {
-    if let Some(manager) = manager
-        && let Some(credentials) = manager.get_credentials(OLLAMA_CLOUD_CREDENTIAL_ID).await?
-    {
+    let credentials = match manager {
+        Some(manager) => manager.get_credentials(OLLAMA_CLOUD_CREDENTIAL_ID).await?,
+        None => None,
+    };
+
+    if let Some(credentials) = credentials {
         let key = credentials.api_key.trim().to_string();
         if !key.is_empty() {
             set_env_if_missing("OLLAMA_API_KEY", &key);
             set_env_if_missing("OLLAMA_CLOUD_API_KEY", &key);
         }
 
-        if let Some(cfg) = provider_entry_mut(config)
-            && cfg.base_url.is_none()
-            && !credentials.endpoint.trim().is_empty()
-        {
-            cfg.base_url = Some(credentials.endpoint);
+        let Some(cfg) = provider_entry_mut(config) else {
+            return Ok(Some(key));
+        };
+        if cfg.base_url.is_none() && !credentials.endpoint.trim().is_empty() {
+            cfg.base_url = Some(credentials.endpoint.clone());
         }
         return Ok(Some(key));
     }
 
-    if let Some(cfg) = provider_entry(config)
-        && let Some(key) = cfg
-            .api_key
-            .as_ref()
-            .map(|value| value.trim())
-            .filter(|value| !value.is_empty())
+    if let Some(key) = provider_entry(config)
+        .and_then(|cfg| cfg.api_key.as_ref())
+        .map(|value| value.trim())
+        .filter(|value| !value.is_empty())
     {
         set_env_if_missing("OLLAMA_API_KEY", key);
         set_env_if_missing("OLLAMA_CLOUD_API_KEY", key);

crates/owlen-cli/src/main.rs

@@ -1,3 +1,5 @@
+#![allow(clippy::collapsible_if)] // TODO: Remove once Rust 2024 let-chains are available
+
 //! OWLEN CLI - Chat TUI client
 
 mod cloud;

crates/owlen-cli/src/mcp.rs

@@ -151,8 +151,9 @@ fn handle_list(args: ListArgs) -> Result<()> {
         "", "Scope", "Name", "Transport"
     );
     for entry in scoped {
-        if let Some(target_scope) = filter_scope
-            && entry.scope != target_scope
+        if filter_scope
+            .as_ref()
+            .is_some_and(|target_scope| entry.scope != *target_scope)
         {
             continue;
         }
@@ -186,8 +187,9 @@ fn handle_list(args: ListArgs) -> Result<()> {
             .collect();
 
         for entry in scoped_resources {
-            if let Some(target_scope) = filter_scope
-                && entry.scope != target_scope
+            if filter_scope
+                .as_ref()
+                .is_some_and(|target_scope| entry.scope != *target_scope)
             {
                 continue;
             }

crates/owlen-core/src/config.rs

@@ -1332,6 +1332,8 @@ pub struct UiSettings {
     pub show_cursor_outside_insert: bool,
     #[serde(default = "UiSettings::default_syntax_highlighting")]
     pub syntax_highlighting: bool,
+    #[serde(default = "UiSettings::default_render_markdown")]
+    pub render_markdown: bool,
     #[serde(default = "UiSettings::default_show_timestamps")]
     pub show_timestamps: bool,
     #[serde(default = "UiSettings::default_icon_mode")]
@@ -1389,7 +1391,11 @@ impl UiSettings {
     }
 
     const fn default_syntax_highlighting() -> bool {
-        false
+        true
+    }
+
+    const fn default_render_markdown() -> bool {
+        true
     }
 
     const fn default_show_timestamps() -> bool {
@@ -1466,6 +1472,7 @@ impl Default for UiSettings {
             scrollback_lines: Self::default_scrollback_lines(),
             show_cursor_outside_insert: Self::default_show_cursor_outside_insert(),
             syntax_highlighting: Self::default_syntax_highlighting(),
+            render_markdown: Self::default_render_markdown(),
             show_timestamps: Self::default_show_timestamps(),
             icon_mode: Self::default_icon_mode(),
         }

crates/owlen-core/src/consent.rs

@@ -58,9 +58,14 @@ impl ConsentManager {
     /// Load consent records from vault storage
     pub fn from_vault(vault: &Arc<std::sync::Mutex<VaultHandle>>) -> Self {
         let guard = vault.lock().expect("Vault mutex poisoned");
-        if let Some(consent_data) = guard.settings().get("consent_records")
-            && let Ok(permanent_records) =
-                serde_json::from_value::<HashMap<String, ConsentRecord>>(consent_data.clone())
+        if let Some(permanent_records) =
+            guard
+                .settings()
+                .get("consent_records")
+                .and_then(|consent_data| {
+                    serde_json::from_value::<HashMap<String, ConsentRecord>>(consent_data.clone())
+                        .ok()
+                })
         {
             return Self {
                 permanent_records,
@@ -90,15 +95,19 @@ impl ConsentManager {
         endpoints: Vec<String>,
     ) -> Result<ConsentScope> {
         // Check if already granted permanently
-        if let Some(existing) = self.permanent_records.get(tool_name)
-            && existing.scope == ConsentScope::Permanent
+        if self
+            .permanent_records
+            .get(tool_name)
+            .is_some_and(|existing| existing.scope == ConsentScope::Permanent)
         {
             return Ok(ConsentScope::Permanent);
         }
 
         // Check if granted for session
-        if let Some(existing) = self.session_records.get(tool_name)
-            && existing.scope == ConsentScope::Session
+        if self
+            .session_records
+            .get(tool_name)
+            .is_some_and(|existing| existing.scope == ConsentScope::Session)
         {
             return Ok(ConsentScope::Session);
         }

crates/owlen-core/src/lib.rs

@@ -1,3 +1,5 @@
+#![allow(clippy::collapsible_if)] // TODO: Remove once we can rely on Rust 2024 let-chains
+
 //! Core traits and types for OWLEN LLM client
 //!
 //! This crate provides the foundational abstractions for building

crates/owlen-core/src/mcp/permission.rs

@@ -156,13 +156,14 @@ mod tests {
     use super::*;
     use crate::mcp::LocalMcpClient;
     use crate::tools::registry::ToolRegistry;
+    use crate::ui::NoOpUiController;
     use crate::validation::SchemaValidator;
     use std::sync::atomic::{AtomicBool, Ordering};
 
     #[tokio::test]
     async fn test_permission_layer_filters_dangerous_tools() {
         let config = Arc::new(Config::default());
-        let ui = Arc::new(crate::ui::NoOpUiController);
+        let ui = Arc::new(NoOpUiController);
         let registry = Arc::new(ToolRegistry::new(
             Arc::new(tokio::sync::Mutex::new((*config).clone())),
             ui,
@@ -186,7 +187,7 @@ mod tests {
     #[tokio::test]
     async fn test_consent_callback_is_invoked() {
         let config = Arc::new(Config::default());
-        let ui = Arc::new(crate::ui::NoOpUiController);
+        let ui = Arc::new(NoOpUiController);
         let registry = Arc::new(ToolRegistry::new(
             Arc::new(tokio::sync::Mutex::new((*config).clone())),
             ui,

crates/owlen-core/src/model.rs

@@ -42,7 +42,7 @@ impl ModelManager {
         F: FnOnce() -> Fut,
         Fut: Future<Output = Result<Vec<ModelInfo>>>,
     {
-        if !force_refresh && let Some(models) = self.cached_if_fresh().await {
+        if let (false, Some(models)) = (force_refresh, self.cached_if_fresh().await) {
             return Ok(models);
         }
 

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

@@ -378,10 +378,8 @@ impl OllamaProvider {
         let family = pick_first_string(map, &["family", "model_family"]);
         let mut families = pick_string_list(map, &["families", "model_families"]);
 
-        if families.is_empty()
-            && let Some(single) = family.clone()
-        {
-            families.push(single);
+        if families.is_empty() {
+            families.extend(family.clone());
         }
 
         let system = pick_first_string(map, &["system"]);

crates/owlen-core/src/router.rs

@@ -71,16 +71,19 @@ impl Router {
     fn find_provider_for_model(&self, model: &str) -> Result<Arc<dyn Provider>> {
         // Check routing rules first
         for rule in &self.routing_rules {
-            if self.matches_pattern(&rule.model_pattern, model)
-                && let Some(provider) = self.registry.get(&rule.provider)
-            {
+            if !self.matches_pattern(&rule.model_pattern, model) {
+                continue;
+            }
+            if let Some(provider) = self.registry.get(&rule.provider) {
                 return Ok(provider);
             }
         }
 
         // Fall back to default provider
-        if let Some(default) = &self.default_provider
-            && let Some(provider) = self.registry.get(default)
+        if let Some(provider) = self
+            .default_provider
+            .as_ref()
+            .and_then(|default| self.registry.get(default))
         {
             return Ok(provider);
         }

crates/owlen-core/src/sandbox.rs

@@ -185,14 +185,20 @@ impl SandboxedProcess {
         if let Ok(output) = output {
             let version_str = String::from_utf8_lossy(&output.stdout);
             // Parse version like "bubblewrap 0.11.0" or "0.11.0"
-            if let Some(version_part) = version_str.split_whitespace().last()
-                && let Some((major, rest)) = version_part.split_once('.')
-                && let Some((minor, _patch)) = rest.split_once('.')
-                && let (Ok(maj), Ok(min)) = (major.parse::<u32>(), minor.parse::<u32>())
-            {
-                // --rlimit-as was added in 0.12.0
-                return maj > 0 || (maj == 0 && min >= 12);
-            }
+            return version_str
+                .split_whitespace()
+                .last()
+                .and_then(|part| {
+                    part.split_once('.').and_then(|(major, rest)| {
+                        rest.split_once('.').and_then(|(minor, _)| {
+                            let maj = major.parse::<u32>().ok()?;
+                            let min = minor.parse::<u32>().ok()?;
+                            Some((maj, min))
+                        })
+                    })
+                })
+                .map(|(maj, min)| maj > 0 || (maj == 0 && min >= 12))
+                .unwrap_or(false);
         }
 
         // If we can't determine the version, assume it doesn't support it (safer default)

crates/owlen-core/src/session.rs

@@ -53,8 +53,8 @@ fn extract_resource_content(value: &Value) -> Option<String> {
         Value::Array(items) => {
             let mut segments = Vec::new();
             for item in items {
-                if let Some(segment) = extract_resource_content(item)
-                    && !segment.is_empty()
+                if let Some(segment) =
+                    extract_resource_content(item).filter(|segment| !segment.is_empty())
                 {
                     segments.push(segment);
                 }
@@ -69,17 +69,19 @@ fn extract_resource_content(value: &Value) -> Option<String> {
             const PREFERRED_FIELDS: [&str; 6] =
                 ["content", "contents", "text", "value", "body", "data"];
             for key in PREFERRED_FIELDS.iter() {
-                if let Some(inner) = map.get(*key)
-                    && let Some(text) = extract_resource_content(inner)
-                    && !text.is_empty()
+                if let Some(text) = map
+                    .get(*key)
+                    .and_then(extract_resource_content)
+                    .filter(|text| !text.is_empty())
                 {
                     return Some(text);
                 }
             }
 
-            if let Some(inner) = map.get("chunks")
-                && let Some(text) = extract_resource_content(inner)
-                && !text.is_empty()
+            if let Some(text) = map
+                .get("chunks")
+                .and_then(extract_resource_content)
+                .filter(|text| !text.is_empty())
             {
                 return Some(text);
             }
@@ -566,9 +568,10 @@ impl SessionController {
             .expect("Consent manager mutex poisoned");
         consent.grant_consent(tool_name, data_types, endpoints);
 
-        if let Some(vault) = &self.vault
-            && let Err(e) = consent.persist_to_vault(vault)
-        {
+        let Some(vault) = &self.vault else {
+            return;
+        };
+        if let Err(e) = consent.persist_to_vault(vault) {
             eprintln!("Warning: Failed to persist consent to vault: {}", e);
         }
     }
@@ -588,10 +591,13 @@ impl SessionController {
         consent.grant_consent_with_scope(tool_name, data_types, endpoints, scope);
 
         // Only persist to vault for permanent consent
-        if is_permanent
-            && let Some(vault) = &self.vault
-            && let Err(e) = consent.persist_to_vault(vault)
-        {
+        if !is_permanent {
+            return;
+        }
+        let Some(vault) = &self.vault else {
+            return;
+        };
+        if let Err(e) = consent.persist_to_vault(vault) {
             eprintln!("Warning: Failed to persist consent to vault: {}", e);
         }
     }

crates/owlen-core/src/storage.rs

@@ -50,14 +50,14 @@ impl StorageManager {
 
     /// Create a storage manager using the provided database path
     pub async fn with_database_path(database_path: PathBuf) -> Result<Self> {
-        if let Some(parent) = database_path.parent()
-            && !parent.exists()
-        {
-            std::fs::create_dir_all(parent).map_err(|e| {
-                Error::Storage(format!(
-                    "Failed to create database directory {parent:?}: {e}"
-                ))
-            })?;
+        if let Some(parent) = database_path.parent() {
+            if !parent.exists() {
+                std::fs::create_dir_all(parent).map_err(|e| {
+                    Error::Storage(format!(
+                        "Failed to create database directory {parent:?}: {e}"
+                    ))
+                })?;
+            }
         }
 
         let options = SqliteConnectOptions::from_str(&format!(
@@ -431,13 +431,13 @@ impl StorageManager {
             }
         }
 
-        if migrated > 0
-            && let Err(err) = archive_legacy_directory(&legacy_dir)
-        {
-            println!(
-                "Warning: migrated sessions but failed to archive legacy directory: {}",
-                err
-            );
+        if migrated > 0 {
+            if let Err(err) = archive_legacy_directory(&legacy_dir) {
+                println!(
+                    "Warning: migrated sessions but failed to archive legacy directory: {}",
+                    err
+                );
+            }
         }
 
         println!("Migrated {} legacy sessions.", migrated);

crates/owlen-markdown/Cargo.toml

@@ -0,0 +1,10 @@
+[package]
+name = "owlen-markdown"
+version.workspace = true
+edition.workspace = true
+license.workspace = true
+description = "Lightweight markdown to ratatui::Text renderer for OWLEN"
+
+[dependencies]
+ratatui = { workspace = true }
+unicode-width = "0.1"

crates/owlen-markdown/src/lib.rs

@@ -0,0 +1,270 @@
+use ratatui::prelude::*;
+use ratatui::text::{Line, Span, Text};
+use unicode_width::UnicodeWidthStr;
+
+/// Convert a markdown string into a `ratatui::Text`.
+///
+/// This lightweight renderer supports common constructs (headings, lists, bold,
+/// italics, and inline code) and is designed to keep dependencies minimal for
+/// the OWLEN project.
+pub fn from_str(input: &str) -> Text<'static> {
+    let mut lines = Vec::new();
+    let mut in_code_block = false;
+
+    for raw_line in input.lines() {
+        let line = raw_line.trim_end_matches('\r');
+        let trimmed = line.trim_start();
+        let indent = &line[..line.len() - trimmed.len()];
+
+        if trimmed.starts_with("```") {
+            in_code_block = !in_code_block;
+            continue;
+        }
+
+        if in_code_block {
+            let mut spans = Vec::new();
+            if !indent.is_empty() {
+                spans.push(Span::raw(indent.to_string()));
+            }
+            spans.push(Span::styled(
+                trimmed.to_string(),
+                Style::default()
+                    .fg(Color::LightYellow)
+                    .add_modifier(Modifier::DIM),
+            ));
+            lines.push(Line::from(spans));
+            continue;
+        }
+
+        if trimmed.is_empty() {
+            lines.push(Line::from(Vec::<Span<'static>>::new()));
+            continue;
+        }
+
+        if trimmed.starts_with('#') {
+            let level = trimmed.chars().take_while(|c| *c == '#').count().min(6);
+            let content = trimmed[level..].trim_start();
+            let mut style = Style::default().add_modifier(Modifier::BOLD);
+            style = match level {
+                1 => style.fg(Color::LightCyan),
+                2 => style.fg(Color::Cyan),
+                _ => style.fg(Color::LightBlue),
+            };
+            let mut spans = Vec::new();
+            if !indent.is_empty() {
+                spans.push(Span::raw(indent.to_string()));
+            }
+            spans.push(Span::styled(content.to_string(), style));
+            lines.push(Line::from(spans));
+            continue;
+        }
+
+        if let Some(rest) = trimmed.strip_prefix("- ") {
+            let mut spans = Vec::new();
+            if !indent.is_empty() {
+                spans.push(Span::raw(indent.to_string()));
+            }
+            spans.push(Span::styled(
+                "• ".to_string(),
+                Style::default().fg(Color::LightGreen),
+            ));
+            spans.extend(parse_inline(rest));
+            lines.push(Line::from(spans));
+            continue;
+        }
+
+        if let Some(rest) = trimmed.strip_prefix("* ") {
+            let mut spans = Vec::new();
+            if !indent.is_empty() {
+                spans.push(Span::raw(indent.to_string()));
+            }
+            spans.push(Span::styled(
+                "• ".to_string(),
+                Style::default().fg(Color::LightGreen),
+            ));
+            spans.extend(parse_inline(rest));
+            lines.push(Line::from(spans));
+            continue;
+        }
+
+        if let Some((number, rest)) = parse_ordered_item(trimmed) {
+            let mut spans = Vec::new();
+            if !indent.is_empty() {
+                spans.push(Span::raw(indent.to_string()));
+            }
+            spans.push(Span::styled(
+                format!("{number}. "),
+                Style::default().fg(Color::LightGreen),
+            ));
+            spans.extend(parse_inline(rest));
+            lines.push(Line::from(spans));
+            continue;
+        }
+
+        let mut spans = Vec::new();
+        if !indent.is_empty() {
+            spans.push(Span::raw(indent.to_string()));
+        }
+        spans.extend(parse_inline(trimmed));
+        lines.push(Line::from(spans));
+    }
+
+    if input.is_empty() {
+        lines.push(Line::from(Vec::<Span<'static>>::new()));
+    }
+
+    Text::from(lines)
+}
+
+fn parse_ordered_item(line: &str) -> Option<(u32, &str)> {
+    let mut parts = line.splitn(2, '.');
+    let number = parts.next()?.trim();
+    let rest = parts.next()?;
+    if number.chars().all(|c| c.is_ascii_digit()) {
+        let value = number.parse().ok()?;
+        let rest = rest.trim_start();
+        Some((value, rest))
+    } else {
+        None
+    }
+}
+
+fn parse_inline(text: &str) -> Vec<Span<'static>> {
+    let mut spans = Vec::new();
+    let bytes = text.as_bytes();
+    let mut i = 0;
+    let len = bytes.len();
+    let mut plain_start = 0;
+
+    while i < len {
+        if bytes[i] == b'`' {
+            if let Some(offset) = text[i + 1..].find('`') {
+                if i > plain_start {
+                    spans.push(Span::raw(text[plain_start..i].to_string()));
+                }
+                let content = &text[i + 1..i + 1 + offset];
+                spans.push(Span::styled(
+                    content.to_string(),
+                    Style::default()
+                        .fg(Color::LightYellow)
+                        .add_modifier(Modifier::BOLD),
+                ));
+                i += offset + 2;
+                plain_start = i;
+                continue;
+            } else {
+                break;
+            }
+        }
+
+        if bytes[i] == b'*' {
+            if i + 1 < len && bytes[i + 1] == b'*' {
+                if let Some(offset) = text[i + 2..].find("**") {
+                    if i > plain_start {
+                        spans.push(Span::raw(text[plain_start..i].to_string()));
+                    }
+                    let content = &text[i + 2..i + 2 + offset];
+                    spans.push(Span::styled(
+                        content.to_string(),
+                        Style::default().add_modifier(Modifier::BOLD),
+                    ));
+                    i += offset + 4;
+                    plain_start = i;
+                    continue;
+                }
+            } else if let Some(offset) = text[i + 1..].find('*') {
+                if i > plain_start {
+                    spans.push(Span::raw(text[plain_start..i].to_string()));
+                }
+                let content = &text[i + 1..i + 1 + offset];
+                spans.push(Span::styled(
+                    content.to_string(),
+                    Style::default().add_modifier(Modifier::ITALIC),
+                ));
+                i += offset + 2;
+                plain_start = i;
+                continue;
+            }
+        }
+
+        if bytes[i] == b'_' {
+            if i + 1 < len && bytes[i + 1] == b'_' {
+                if let Some(offset) = text[i + 2..].find("__") {
+                    if i > plain_start {
+                        spans.push(Span::raw(text[plain_start..i].to_string()));
+                    }
+                    let content = &text[i + 2..i + 2 + offset];
+                    spans.push(Span::styled(
+                        content.to_string(),
+                        Style::default().add_modifier(Modifier::BOLD),
+                    ));
+                    i += offset + 4;
+                    plain_start = i;
+                    continue;
+                }
+            } else if let Some(offset) = text[i + 1..].find('_') {
+                if i > plain_start {
+                    spans.push(Span::raw(text[plain_start..i].to_string()));
+                }
+                let content = &text[i + 1..i + 1 + offset];
+                spans.push(Span::styled(
+                    content.to_string(),
+                    Style::default().add_modifier(Modifier::ITALIC),
+                ));
+                i += offset + 2;
+                plain_start = i;
+                continue;
+            }
+        }
+
+        i += 1;
+    }
+
+    if plain_start < len {
+        spans.push(Span::raw(text[plain_start..].to_string()));
+    }
+
+    if spans.is_empty() {
+        spans.push(Span::raw(String::new()));
+    }
+
+    spans
+}
+
+#[allow(dead_code)]
+fn visual_length(spans: &[Span<'_>]) -> usize {
+    spans
+        .iter()
+        .map(|span| UnicodeWidthStr::width(span.content.as_ref()))
+        .sum()
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn headings_are_bold() {
+        let text = from_str("# Heading");
+        assert_eq!(text.lines.len(), 1);
+        let line = &text.lines[0];
+        assert!(
+            line.spans
+                .iter()
+                .any(|span| span.style.contains(Modifier::BOLD))
+        );
+    }
+
+    #[test]
+    fn inline_code_styled() {
+        let text = from_str("Use `code` inline.");
+        let styled = text
+            .lines
+            .iter()
+            .flat_map(|line| &line.spans)
+            .find(|span| span.content.as_ref() == "code")
+            .cloned()
+            .unwrap();
+        assert!(styled.style.contains(Modifier::BOLD));
+    }
+}

crates/owlen-tui/Cargo.toml

@@ -27,6 +27,9 @@ tree-sitter = "0.20"
 tree-sitter-rust = "0.20"
 dirs = { workspace = true }
 toml = { workspace = true }
+syntect = "5.3"
+once_cell = "1.19"
+owlen-markdown = { path = "../owlen-markdown" }
 
 # Async runtime
 tokio = { workspace = true }

crates/owlen-tui/src/commands/mod.rs

@@ -14,7 +14,15 @@ const COMMANDS: &[CommandSpec] = &[
     },
     CommandSpec {
         keyword: "q",
-        description: "Alias for quit",
+        description: "Close the active file",
+    },
+    CommandSpec {
+        keyword: "w",
+        description: "Save the active file",
+    },
+    CommandSpec {
+        keyword: "write",
+        description: "Alias for w",
     },
     CommandSpec {
         keyword: "clear",
@@ -25,12 +33,16 @@ const COMMANDS: &[CommandSpec] = &[
         description: "Alias for clear",
     },
     CommandSpec {
-        keyword: "w",
-        description: "Alias for write",
+        keyword: "save",
+        description: "Alias for w",
     },
     CommandSpec {
-        keyword: "save",
-        description: "Alias for write",
+        keyword: "wq",
+        description: "Save and close the active file",
+    },
+    CommandSpec {
+        keyword: "x",
+        description: "Alias for wq",
     },
     CommandSpec {
         keyword: "load",
@@ -44,6 +56,10 @@ const COMMANDS: &[CommandSpec] = &[
         keyword: "open",
         description: "Open a file in the code view",
     },
+    CommandSpec {
+        keyword: "create",
+        description: "Create a file (creates missing directories)",
+    },
     CommandSpec {
         keyword: "close",
         description: "Close the active code view",
@@ -68,9 +84,13 @@ const COMMANDS: &[CommandSpec] = &[
         keyword: "sessions",
         description: "List saved sessions",
     },
+    CommandSpec {
+        keyword: "session save",
+        description: "Save the current conversation",
+    },
     CommandSpec {
         keyword: "help",
-        description: "Show help documentation",
+        description: "Open the help overlay",
     },
     CommandSpec {
         keyword: "h",
@@ -128,6 +148,10 @@ const COMMANDS: &[CommandSpec] = &[
         keyword: "reload",
         description: "Reload configuration and themes",
     },
+    CommandSpec {
+        keyword: "markdown",
+        description: "Toggle markdown rendering",
+    },
     CommandSpec {
         keyword: "e",
         description: "Edit a file",
@@ -180,6 +204,14 @@ const COMMANDS: &[CommandSpec] = &[
         keyword: "layout load",
         description: "Restore the last saved pane layout",
     },
+    CommandSpec {
+        keyword: "files",
+        description: "Toggle the files panel",
+    },
+    CommandSpec {
+        keyword: "explorer",
+        description: "Alias for files",
+    },
 ];
 
 /// Return the static catalog of commands.

crates/owlen-tui/src/highlight.rs

@@ -0,0 +1,160 @@
+use once_cell::sync::Lazy;
+use ratatui::style::{Color as TuiColor, Modifier, Style as TuiStyle};
+use std::path::{Path, PathBuf};
+use syntect::easy::HighlightLines;
+use syntect::highlighting::{FontStyle, Style as SynStyle, Theme, ThemeSet};
+use syntect::parsing::{SyntaxReference, SyntaxSet};
+
+static SYNTAX_SET: Lazy<SyntaxSet> = Lazy::new(SyntaxSet::load_defaults_newlines);
+static THEME_SET: Lazy<ThemeSet> = Lazy::new(ThemeSet::load_defaults);
+static THEME: Lazy<Theme> = Lazy::new(|| {
+    THEME_SET
+        .themes
+        .get("base16-ocean.dark")
+        .cloned()
+        .or_else(|| THEME_SET.themes.values().next().cloned())
+        .unwrap_or_default()
+});
+
+fn select_syntax(path_hint: Option<&Path>) -> &'static SyntaxReference {
+    if let Some(path) = path_hint {
+        if let Ok(Some(syntax)) = SYNTAX_SET.find_syntax_for_file(path) {
+            return syntax;
+        }
+        if let Some(ext) = path.extension().and_then(|ext| ext.to_str()) {
+            if let Some(syntax) = SYNTAX_SET.find_syntax_by_extension(ext) {
+                return syntax;
+            }
+        }
+        if let Some(name) = path.file_name().and_then(|name| name.to_str()) {
+            if let Some(syntax) = SYNTAX_SET.find_syntax_by_token(name) {
+                return syntax;
+            }
+        }
+    }
+
+    SYNTAX_SET.find_syntax_plain_text()
+}
+
+fn select_syntax_for_language(language: Option<&str>) -> &'static SyntaxReference {
+    let token = language
+        .map(|lang| lang.trim().to_ascii_lowercase())
+        .filter(|lang| !lang.is_empty());
+
+    if let Some(token) = token {
+        let mut attempts: Vec<&str> = vec![token.as_str()];
+        match token.as_str() {
+            "c++" => attempts.extend(["cpp", "c"]),
+            "c#" | "cs" => attempts.extend(["csharp", "cs"]),
+            "shell" => attempts.extend(["bash", "sh"]),
+            "typescript" | "ts" => attempts.extend(["typescript", "ts", "tsx"]),
+            "javascript" | "js" => attempts.extend(["javascript", "js", "jsx"]),
+            "py" => attempts.push("python"),
+            "rs" => attempts.push("rust"),
+            "yml" => attempts.push("yaml"),
+            other => {
+                if let Some(stripped) = other.strip_prefix('.') {
+                    attempts.push(stripped);
+                }
+            }
+        }
+
+        for candidate in attempts {
+            if let Some(syntax) = SYNTAX_SET.find_syntax_by_token(candidate) {
+                return syntax;
+            }
+            if let Some(syntax) = SYNTAX_SET.find_syntax_by_extension(candidate) {
+                return syntax;
+            }
+        }
+    }
+
+    SYNTAX_SET.find_syntax_plain_text()
+}
+
+fn path_hint_from_components(absolute: Option<&Path>, display: Option<&str>) -> Option<PathBuf> {
+    if let Some(abs) = absolute {
+        return Some(abs.to_path_buf());
+    }
+    display.map(PathBuf::from)
+}
+
+fn style_from_syntect(style: SynStyle) -> TuiStyle {
+    let mut tui_style = TuiStyle::default().fg(TuiColor::Rgb(
+        style.foreground.r,
+        style.foreground.g,
+        style.foreground.b,
+    ));
+
+    let mut modifiers = Modifier::empty();
+    if style.font_style.contains(FontStyle::BOLD) {
+        modifiers |= Modifier::BOLD;
+    }
+    if style.font_style.contains(FontStyle::ITALIC) {
+        modifiers |= Modifier::ITALIC;
+    }
+    if style.font_style.contains(FontStyle::UNDERLINE) {
+        modifiers |= Modifier::UNDERLINED;
+    }
+
+    if !modifiers.is_empty() {
+        tui_style = tui_style.add_modifier(modifiers);
+    }
+
+    tui_style
+}
+
+pub fn build_highlighter(
+    absolute: Option<&Path>,
+    display: Option<&str>,
+) -> HighlightLines<'static> {
+    let hint_path = path_hint_from_components(absolute, display);
+    let syntax = select_syntax(hint_path.as_deref());
+    HighlightLines::new(syntax, &THEME)
+}
+
+pub fn highlight_line(
+    highlighter: &mut HighlightLines<'static>,
+    line: &str,
+) -> Vec<(TuiStyle, String)> {
+    let mut segments = Vec::new();
+    match highlighter.highlight_line(line, &SYNTAX_SET) {
+        Ok(result) => {
+            for (style, piece) in result {
+                let tui_style = style_from_syntect(style);
+                segments.push((tui_style, piece.to_string()));
+            }
+        }
+        Err(_) => {
+            segments.push((TuiStyle::default(), line.to_string()));
+        }
+    }
+
+    if segments.is_empty() {
+        segments.push((TuiStyle::default(), String::new()));
+    }
+
+    segments
+}
+
+pub fn build_highlighter_for_language(language: Option<&str>) -> HighlightLines<'static> {
+    let syntax = select_syntax_for_language(language);
+    HighlightLines::new(syntax, &THEME)
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn rust_highlighting_produces_colored_segment() {
+        let mut highlighter = build_highlighter_for_language(Some("rust"));
+        let segments = highlight_line(&mut highlighter, "fn main() {}");
+        assert!(
+            segments
+                .iter()
+                .any(|(style, text)| style.fg.is_some() && !text.trim().is_empty()),
+            "Expected at least one colored segment"
+        );
+    }
+}

crates/owlen-tui/src/lib.rs

@@ -1,3 +1,5 @@
+#![allow(clippy::collapsible_if)] // TODO: Remove once Rust 2024 let-chains are available
+
 //! # Owlen TUI
 //!
 //! This crate contains all the logic for the terminal user interface (TUI) of Owlen.
@@ -17,6 +19,7 @@ pub mod code_app;
 pub mod commands;
 pub mod config;
 pub mod events;
+pub mod highlight;
 pub mod model_info_panel;
 pub mod slash;
 pub mod state;

crates/owlen-tui/src/state/file_tree.rs

@@ -110,7 +110,7 @@ impl FileTreeState {
             cursor: 0,
             scroll_top: 0,
             viewport_height: 20,
-            filter_mode: FilterMode::Fuzzy,
+            filter_mode: FilterMode::Glob,
             filter_query: String::new(),
             show_hidden: false,
             filter_matches: Vec::new(),
@@ -198,6 +198,14 @@ impl FileTreeState {
         &self.filter_query
     }
 
+    pub fn set_filter_mode(&mut self, mode: FilterMode) {
+        if self.filter_mode != mode {
+            self.filter_mode = mode;
+            self.recompute_filter_cache();
+            self.rebuild_visible();
+        }
+    }
+
     pub fn show_hidden(&self) -> bool {
         self.show_hidden
     }
@@ -276,12 +284,11 @@ impl FileTreeState {
     }
 
     pub fn toggle_filter_mode(&mut self) {
-        self.filter_mode = match self.filter_mode {
+        let next = match self.filter_mode {
             FilterMode::Glob => FilterMode::Fuzzy,
             FilterMode::Fuzzy => FilterMode::Glob,
         };
-        self.recompute_filter_cache();
-        self.rebuild_visible();
+        self.set_filter_mode(next);
     }
 
     pub fn toggle_hidden(&mut self) -> Result<()> {
@@ -295,16 +302,18 @@ impl FileTreeState {
             return;
         }
 
-        if let Some(rel) = diff_paths(path, &self.root)
-            && let Some(index) = self
+        if let Some(rel) = diff_paths(path, &self.root) {
+            if let Some(index) = self
                 .nodes
                 .iter()
                 .position(|node| node.path == rel || node.path == path)
-        {
-            self.expand_to(index);
-            if let Some(cursor_pos) = self.visible.iter().position(|entry| entry.index == index) {
-                self.cursor = cursor_pos;
-                self.ensure_cursor_in_view();
+            {
+                self.expand_to(index);
+                if let Some(cursor_pos) = self.visible.iter().position(|entry| entry.index == index)
+                {
+                    self.cursor = cursor_pos;
+                    self.ensure_cursor_in_view();
+                }
             }
         }
     }
@@ -554,10 +563,10 @@ fn build_nodes(
         node.is_expanded = node.should_default_expand();
 
         let index = nodes.len();
-        if let Some(parent_idx) = parent
-            && let Some(parent_node) = nodes.get_mut(parent_idx)
-        {
-            parent_node.children.push(index);
+        if let Some(parent_idx) = parent {
+            if let Some(parent_node) = nodes.get_mut(parent_idx) {
+                parent_node.children.push(index);
+            }
         }
 
         index_by_path.insert(relative, index);
@@ -578,22 +587,31 @@ fn propagate_directory_git_state(nodes: &mut [FileNode]) {
             continue;
         }
         let mut has_dirty = false;
+        let mut dirty_badge: Option<char> = None;
         let mut has_staged = false;
         for child in nodes[idx].children.clone() {
-            match nodes.get(child).map(|n| n.git.cleanliness) {
-                Some('●') => {
-                    has_dirty = true;
-                    break;
+            if let Some(child_node) = nodes.get(child) {
+                match child_node.git.cleanliness {
+                    '●' => {
+                        has_dirty = true;
+                        let candidate = child_node.git.badge.unwrap_or('M');
+                        dirty_badge = Some(match (dirty_badge, candidate) {
+                            (Some('D'), _) | (_, 'D') => 'D',
+                            (Some('U'), _) | (_, 'U') => 'U',
+                            (Some(existing), _) => existing,
+                            (None, new_badge) => new_badge,
+                        });
+                    }
+                    '○' => {
+                        has_staged = true;
+                    }
+                    _ => {}
                 }
-                Some('○') => {
-                    has_staged = true;
-                }
-                _ => {}
             }
         }
 
         nodes[idx].git = if has_dirty {
-            GitDecoration::dirty(None)
+            GitDecoration::dirty(dirty_badge)
         } else if has_staged {
             GitDecoration::staged(None)
         } else {

crates/owlen-tui/src/state/search.rs

@@ -182,12 +182,14 @@ impl RepoSearchState {
             if matches!(
                 self.rows[self.selected_row].kind,
                 RepoSearchRowKind::FileHeader
-            ) && let Some(idx) = self
-                .rows
-                .iter()
-                .position(|row| matches!(row.kind, RepoSearchRowKind::Match { .. }))
-            {
-                self.selected_row = idx;
+            ) {
+                if let Some(idx) = self
+                    .rows
+                    .iter()
+                    .position(|row| matches!(row.kind, RepoSearchRowKind::Match { .. }))
+                {
+                    self.selected_row = idx;
+                }
             }
             self.ensure_selection_visible();
         }

crates/owlen-tui/src/state/workspace.rs

@@ -85,6 +85,31 @@ pub enum LayoutNode {
 }
 
 impl LayoutNode {
+    pub fn ensure_ratio_bounds(&mut self) {
+        match self {
+            LayoutNode::Split {
+                ratio,
+                first,
+                second,
+                ..
+            } => {
+                *ratio = ratio.clamp(0.1, 0.9);
+                first.ensure_ratio_bounds();
+                second.ensure_ratio_bounds();
+            }
+            LayoutNode::Leaf(_) => {}
+        }
+    }
+
+    pub fn nudge_ratio(&mut self, delta: f32) {
+        match self {
+            LayoutNode::Split { ratio, .. } => {
+                *ratio = (*ratio + delta).clamp(0.1, 0.9);
+            }
+            LayoutNode::Leaf(_) => {}
+        }
+    }
+
     fn replace_leaf(&mut self, target: PaneId, replacement: LayoutNode) -> bool {
         match self {
             LayoutNode::Leaf(id) => {
@@ -265,6 +290,17 @@ impl CodePane {
         self.scroll.scroll = 0;
     }
 
+    pub fn update_paths(&mut self, absolute_path: Option<PathBuf>, display_path: Option<String>) {
+        self.absolute_path = absolute_path;
+        self.display_path = display_path.clone();
+        self.title = self
+            .absolute_path
+            .as_ref()
+            .and_then(|path| path.file_name().map(|s| s.to_string_lossy().into_owned()))
+            .or(display_path)
+            .unwrap_or_else(|| "Untitled".to_string());
+    }
+
     pub fn clear(&mut self) {
         self.absolute_path = None;
         self.display_path = None;