From a5d604176400a2fb026c6ea48a8b852866237785 Mon Sep 17 00:00:00 2001 From: MangoFanFanw Date: Mon, 11 May 2026 13:18:07 +0800 Subject: [PATCH] Initial commit: Meow TUI AI chat client A Rust terminal chat client with OpenAI-compatible provider support, real-time SSE streaming, markdown rendering with syntax highlighting, and persistent chat history. Co-Authored-By: Claude Opus 4.7 --- .gitignore | 3 + CLAUDE.md | 143 +++ Cargo.lock | 2532 +++++++++++++++++++++++++++++++++++++++ Cargo.toml | 22 + src/app.rs | 811 +++++++++++++ src/config.rs | 65 + src/main.rs | 65 + src/message.rs | 74 ++ src/providers/mod.rs | 39 + src/providers/openai.rs | 186 +++ src/storage.rs | 82 ++ src/tui/input.rs | 218 ++++ src/tui/markdown.rs | 211 ++++ src/tui/mod.rs | 73 ++ 14 files changed, 4524 insertions(+) create mode 100644 .gitignore create mode 100644 CLAUDE.md create mode 100644 Cargo.lock create mode 100644 Cargo.toml create mode 100644 src/app.rs create mode 100644 src/config.rs create mode 100644 src/main.rs create mode 100644 src/message.rs create mode 100644 src/providers/mod.rs create mode 100644 src/providers/openai.rs create mode 100644 src/storage.rs create mode 100644 src/tui/input.rs create mode 100644 src/tui/markdown.rs create mode 100644 src/tui/mod.rs diff --git a/.gitignore b/.gitignore new file mode 100644 index 0000000..15bdd96 --- /dev/null +++ b/.gitignore @@ -0,0 +1,3 @@ +/target +/.idea +*.iml diff --git a/CLAUDE.md b/CLAUDE.md new file mode 100644 index 0000000..9d166be --- /dev/null +++ b/CLAUDE.md @@ -0,0 +1,143 @@ +# Meow - Rust Terminal AI Chat Client + +A high-performance terminal UI (TUI) AI chat client written in Rust, supporting custom OpenAI-compatible providers (DeepSeek, Kimi, etc.). + +## Overview + +Meow is a pure-text terminal chat application. It features: + +- OpenAI-compatible provider abstraction layer +- Real-time streaming (SSE) chat output +- Markdown rendering with syntax highlighting +- Persistent chat history in JSON Lines format +- Mouse scroll support for message history + +## Tech Stack + +| Component | Crate | +|-----------|-------| +| Async Runtime | `tokio` | +| HTTP Client | `reqwest` (with streaming/SSE) | +| TUI Framework | `ratatui` + `crossterm` | +| Markdown Parser | `pulldown-cmark` | +| Syntax Highlighting | `syntect` (fancy-regex backend) | +| Serialization | `serde` + `serde_json` + `toml` | +| Configuration Path | `dirs` (cross-platform home dir) | + +## Architecture + +### Layered Design + +``` +TUI Layer (ratatui widgets) + ├── chat.rs (implicit in app.rs) + ├── model_select.rs (popup) + ├── provider_config.rs (form) + ├── input.rs (multi-line text area) + └── markdown.rs (rendering pipeline) + +App Layer (state machine) + └── app.rs - coordinates all modules, event loop, async stream handling + +Provider Layer + ├── providers/mod.rs - Provider trait + └── providers/openai.rs - OpenAI-compatible implementation + +Storage Layer + ├── config.rs - ~/.meow/config.toml + ├── storage.rs - ~/.meow/data/sessions/*.jsonl + └── message.rs - core data types +``` + +### Data Flow + +1. User types message in input box +2. `Enter` triggers `App::send_message()` +3. User message is saved to disk via `Storage::append_message()` +4. A tokio task spawns to call `Provider::chat_stream()` +5. SSE chunks flow back through `tokio::sync::mpsc::UnboundedChannel` +6. Main event loop polls channel via `App::poll_stream()` and redraws +7. When stream ends (`__STREAM_END__`), the full assistant message is persisted + +## Project Structure + +``` +src/ +├── main.rs # Entry point: initializes tokio, Tui, App, event loop +├── app.rs # App state machine: Chat / ModelSelect / ProviderConfig +├── config.rs # Config & ProviderConfig structs, load/save to ~/.meow/config.toml +├── message.rs # Role enum, Message, ChatSession +├── storage.rs # JSON Lines persistence for chat sessions +├── providers/ +│ ├── mod.rs # Provider trait, Model struct, ProviderError +│ └── openai.rs # OpenAICompatibleProvider: /v1/models, /v1/chat/completions SSE +└── tui/ + ├── mod.rs # Tui struct: terminal init/restore, raw mode, panic hooks + ├── input.rs # InputState: multi-line editor with cursor movement + └── markdown.rs # MarkdownRenderer: pulldown-cmark -> ratatui Lines + syntect highlighting +``` + +## Configuration + +Config is stored at `~/.meow/config.toml` (cross-platform via `dirs::home_dir()`). + +Example: + +```toml +[[providers]] +name = "DeepSeek" +base_url = "https://api.deepseek.com" +api_key = "sk-..." +default_model = "deepseek-chat" +``` + +Chat sessions are stored as JSON Lines at `~/.meow/data/sessions/.jsonl`. + +## Keybindings + +| Key | Action | +|-----|--------| +| `Enter` | Send message | +| `Shift+Enter` | Newline in input | +| `Ctrl+P` | Open model selector | +| `Ctrl+S` | Open provider config | +| `Ctrl+N` | Start new chat session | +| `Ctrl+B` | Toggle sidebar | +| `Ctrl+R` | Reset current chat | +| `Ctrl+C` | Stop streaming (while AI is typing) | +| `Ctrl+Q` | Quit | +| `Mouse Scroll` | Scroll message history | + +## Provider Protocol + +The `Provider` trait (`async_trait`) defines: + +- `name() -> &str` +- `config() -> &ProviderConfig` +- `list_models() -> Result>` +- `chat_stream(model, messages) -> Result>>` + +`OpenAICompatibleProvider` implements this for any OpenAI API-compatible endpoint. + +## Markdown Support + +Rendered elements: + +- **Bold** / *Italic* +- `Inline code` (dark background) +- Code blocks with syntax highlighting (syntect themes) +- Bullet / numbered lists +- Blockquotes (│ prefix) +- Horizontal rules + +## First-Time Setup + +On first run, if no providers exist, the app automatically enters the **Add Provider** form. 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default-features = false } +serde = { version = "1", features = ["derive"] } +serde_json = "1" +toml = "0.8" +dirs = "6" +anyhow = "1" +thiserror = "1" +async-trait = "0.1" +futures = "0.3" +ratatui = "0.29" +crossterm = "0.28" +pulldown-cmark = "0.12" +syntect = { version = "5", default-features = false, features = ["default-themes", "default-syntaxes", "regex-fancy"] } +chrono = { version = "0.4", features = ["serde"] } +uuid = { version = "1", features = ["v4", "serde"] } diff --git a/src/app.rs b/src/app.rs new file mode 100644 index 0000000..3ace0b3 --- /dev/null +++ b/src/app.rs @@ -0,0 +1,811 @@ +use crate::{ + config::{Config, ProviderConfig}, + message::{ChatSession, Message, Role}, + providers::{openai::OpenAICompatibleProvider, Model, Provider}, + storage::Storage, + tui::{input::InputState, markdown::MarkdownRenderer}, +}; +use anyhow::Result; +use crossterm::event::{KeyCode, KeyEvent, KeyModifiers}; +use ratatui::{ + layout::{Alignment, Constraint, Direction, Layout, Margin, Rect}, + style::{Color, Modifier, Style}, + text::{Line, Span, Text}, + widgets::{ + Block, Borders, Clear, List, ListItem, Paragraph, Scrollbar, ScrollbarOrientation, + ScrollbarState, Wrap, + }, + Frame, +}; +use tokio::sync::mpsc; + +#[derive(Debug, Clone)] +pub struct ProviderForm { + pub name: String, + pub base_url: String, + pub api_key: String, + pub default_model: String, + pub focus: usize, +} + +impl Default for ProviderForm { + fn default() -> Self { + Self { + name: String::new(), + base_url: String::new(), + api_key: String::new(), + default_model: String::new(), + focus: 0, + } + } +} + +#[derive(Debug, Clone)] +pub enum AppState { + Chat, + ModelSelect { + models: Vec, + selected: usize, + filtered: Vec, + filter_input: String, + }, + ProviderConfig { + form: ProviderForm, + editing: Option, + }, +} + +pub struct App { + pub state: AppState, + pub config: Config, + pub current_provider_idx: Option, + pub current_model: Option, + pub current_session: ChatSession, + pub input: InputState, + pub messages_scroll: usize, + pub is_streaming: bool, + pub stream_buffer: String, + stream_tx: mpsc::UnboundedSender, + stream_rx: mpsc::UnboundedReceiver, + pub providers: Vec>, + pub markdown_renderer: MarkdownRenderer, + pub quit: bool, + pub show_sidebar: bool, + pub status_message: Option, +} + +impl App { + pub async fn new() -> Result { + let config = Config::load()?; + let providers: Vec> = config + .providers + .iter() + .map(|p| { + let p = p.clone(); + Box::new(OpenAICompatibleProvider::new(p)) as Box + }) + .collect(); + + let (stream_tx, stream_rx) = mpsc::unbounded_channel(); + let current_provider_idx = if providers.is_empty() { None } else { Some(0) }; + let current_model = current_provider_idx + .and_then(|i| config.providers.get(i)) + .and_then(|p| p.default_model.clone()); + + let state = if config.is_empty() { + AppState::ProviderConfig { + form: ProviderForm::default(), + editing: None, + } + } else { + AppState::Chat + }; + + let current_session = ChatSession::new("New Chat"); + + Ok(Self { + state, + config, + current_provider_idx, + current_model, + current_session, + input: InputState::new(), + messages_scroll: 0, + is_streaming: false, + stream_buffer: String::new(), + stream_tx, + stream_rx, + providers, + markdown_renderer: MarkdownRenderer::new(), + quit: false, + show_sidebar: true, + status_message: None, + }) + } + + pub fn rebuild_providers(&mut self) { + self.providers = self + .config + .providers + .iter() + .map(|p| { + let p = p.clone(); + Box::new(OpenAICompatibleProvider::new(p)) as Box + }) + .collect(); + } + + pub fn current_provider(&self) -> Option<&dyn Provider> { + self.current_provider_idx + .and_then(|i| self.providers.get(i)) + .map(|p| p.as_ref()) + } + + pub async fn on_key_event(&mut self, key: KeyEvent) -> Result<()> { + if self.is_streaming && key.code == KeyCode::Char('c') && key.modifiers == KeyModifiers::CONTROL { + self.is_streaming = false; + self.finish_stream_message(); + return Ok(()); + } + + match &mut self.state { + AppState::Chat => self.handle_chat_key(key).await, + AppState::ModelSelect { .. } => self.handle_model_select_key(key).await, + AppState::ProviderConfig { .. } => self.handle_provider_config_key(key).await, + } + } + + async fn handle_chat_key(&mut self, key: KeyEvent) -> Result<()> { + match (key.code, key.modifiers) { + (KeyCode::Char('q'), KeyModifiers::CONTROL) => { + self.quit = true; + } + (KeyCode::Char('p'), KeyModifiers::CONTROL) => { + if let Some(idx) = self.current_provider_idx { + self.status_message = Some("Loading models...".to_string()); + if let Some(provider) = self.providers.get(idx) { + match provider.list_models().await { + Ok(models) => { + let filtered: Vec = (0..models.len()).collect(); + self.state = AppState::ModelSelect { + models, + selected: 0, + filtered, + filter_input: String::new(), + }; + } + Err(e) => { + self.status_message = Some(format!("Failed to load models: {}", e)); + } + } + } + } + } + (KeyCode::Char('s'), KeyModifiers::CONTROL) => { + self.state = AppState::ProviderConfig { + form: ProviderForm::default(), + editing: None, + }; + } + (KeyCode::Char('n'), KeyModifiers::CONTROL) => { + self.save_current_session()?; + self.current_session = ChatSession::new("New Chat"); + self.messages_scroll = 0; + } + (KeyCode::Char('b'), KeyModifiers::CONTROL) => { + self.show_sidebar = !self.show_sidebar; + } + (KeyCode::Char('r'), KeyModifiers::CONTROL) => { + if !self.is_streaming { + self.input.clear(); + self.current_session = ChatSession::new("New Chat"); + self.messages_scroll = 0; + } + } + _ => { + if self.is_streaming { + return Ok(()); + } + let action = self.input.handle_key_event(key); + match action { + crate::tui::input::InputAction::Submit => { + self.send_message().await?; + } + crate::tui::input::InputAction::CursorMoved + | crate::tui::input::InputAction::Typed => {} + _ => {} + } + } + } + Ok(()) + } + + async fn handle_model_select_key(&mut self, key: KeyEvent) -> Result<()> { + if let AppState::ModelSelect { + models, + selected, + filtered, + filter_input, + } = &mut self.state + { + match key.code { + KeyCode::Esc => { + self.state = AppState::Chat; + } + KeyCode::Up => { + if *selected > 0 { + *selected -= 1; + } + } + KeyCode::Down => { + if *selected + 1 < filtered.len() { + *selected += 1; + } + } + KeyCode::Enter => { + if let Some(&idx) = filtered.get(*selected) { + if let Some(model) = models.get(idx) { + self.current_model = Some(model.id.clone()); + if let Some(pidx) = self.current_provider_idx { + if let Some(p) = self.config.providers.get_mut(pidx) { + p.default_model = Some(model.id.clone()); + let _ = self.config.save(); + } + } + } + } + self.state = AppState::Chat; + } + KeyCode::Char(c) if key.modifiers == KeyModifiers::NONE => { + filter_input.push(c); + *selected = 0; + *filtered = models + .iter() + .enumerate() + .filter(|(_, m)| { + m.id.to_lowercase().contains(&filter_input.to_lowercase()) + || m.name.to_lowercase().contains(&filter_input.to_lowercase()) + }) + .map(|(i, _)| i) + .collect(); + } + KeyCode::Backspace => { + filter_input.pop(); + *selected = 0; + *filtered = models + .iter() + .enumerate() + .filter(|(_, m)| { + m.id.to_lowercase().contains(&filter_input.to_lowercase()) + || m.name.to_lowercase().contains(&filter_input.to_lowercase()) + }) + .map(|(i, _)| i) + .collect(); + } + _ => {} + } + } + Ok(()) + } + + async fn handle_provider_config_key(&mut self, key: KeyEvent) -> Result<()> { + if let AppState::ProviderConfig { form, editing } = &mut self.state { + let mut fields: Vec<&mut String> = vec![ + &mut form.name, + &mut form.base_url, + &mut form.api_key, + &mut form.default_model, + ]; + + match (key.code, key.modifiers) { + (KeyCode::Esc, _) => { + if self.config.is_empty() { + self.quit = true; + } else { + self.state = AppState::Chat; + } + } + (KeyCode::Tab, _) | (KeyCode::Down, KeyModifiers::CONTROL) => { + form.focus = (form.focus + 1) % fields.len(); + } + (KeyCode::BackTab, _) => { + form.focus = (form.focus + fields.len() - 1) % fields.len(); + } + (KeyCode::Enter, _) => { + if !form.name.is_empty() && !form.base_url.is_empty() && !form.api_key.is_empty() { + let new_config = ProviderConfig { + name: form.name.clone(), + base_url: form.base_url.clone(), + api_key: form.api_key.clone(), + default_model: if form.default_model.is_empty() { + None + } else { + Some(form.default_model.clone()) + }, + }; + if let Some(idx) = editing { + if *idx < self.config.providers.len() { + self.config.providers[*idx] = new_config; + } + } else { + self.config.providers.push(new_config); + } + self.config.save()?; + self.rebuild_providers(); + if self.current_provider_idx.is_none() && !self.providers.is_empty() { + self.current_provider_idx = Some(0); + self.current_model = self.config.providers[0].default_model.clone(); + } + self.state = AppState::Chat; + } + } + (KeyCode::Char(c), KeyModifiers::NONE) + | (KeyCode::Char(c), KeyModifiers::SHIFT) => { + if let Some(field) = fields.get_mut(form.focus) { + field.push(c); + } + } + (KeyCode::Backspace, _) => { + if let Some(field) = fields.get_mut(form.focus) { + field.pop(); + } + } + _ => {} + } + } + Ok(()) + } + + async fn send_message(&mut self) -> Result<()> { + let text = self.input.text(); + if text.trim().is_empty() { + return Ok(()); + } + self.input.clear(); + + let provider_config = match self.current_provider_idx { + Some(idx) => match self.providers.get(idx) { + Some(p) => p.config().clone(), + None => { + self.status_message = Some("No provider configured".to_string()); + return Ok(()); + } + }, + None => { + self.status_message = Some("No provider configured".to_string()); + return Ok(()); + } + }; + + let model = match &self.current_model { + Some(m) => m.clone(), + None => { + self.status_message = Some("No model selected".to_string()); + return Ok(()); + } + }; + + let user_msg = Message::user(&text); + Storage::append_message(self.current_session.id, &user_msg)?; + self.current_session.add_message(user_msg); + + let messages: Vec = self.current_session.messages.clone(); + let tx = self.stream_tx.clone(); + let model_clone = model.clone(); + + self.is_streaming = true; + self.stream_buffer.clear(); + + tokio::spawn(async move { + let p = OpenAICompatibleProvider::new(provider_config); + match p.chat_stream(&model_clone, &messages).await { + Ok(mut stream) => { + while let Some(result) = stream.next().await { + match result { + Ok(chunk) => { + if tx.send(chunk).is_err() { + break; + } + } + Err(e) => { + let _ = tx.send(format!("\n[Error: {}]", e)); + break; + } + } + } + } + Err(e) => { + let _ = tx.send(format!("\n[Error: {}]", e)); + } + } + let _ = tx.send("__STREAM_END__".to_string()); + }); + + Ok(()) + } + + pub fn poll_stream(&mut self) -> bool { + let mut updated = false; + while let Ok(chunk) = self.stream_rx.try_recv() { + if chunk == "__STREAM_END__" { + self.finish_stream_message(); + updated = true; + break; + } + self.stream_buffer.push_str(&chunk); + updated = true; + } + updated + } + + fn finish_stream_message(&mut self) { + self.is_streaming = false; + if !self.stream_buffer.is_empty() { + let msg = Message::assistant(&self.stream_buffer); + let _ = Storage::append_message(self.current_session.id, &msg); + self.current_session.add_message(msg); + self.stream_buffer.clear(); + } + } + + fn save_current_session(&self) -> Result<()> { + for msg in &self.current_session.messages { + Storage::append_message(self.current_session.id, msg)?; + } + Ok(()) + } + + pub fn draw(&self, frame: &mut Frame) { + let area = frame.area(); + + match &self.state { + AppState::Chat => self.draw_chat(frame, area), + AppState::ModelSelect { .. } => { + self.draw_chat(frame, area); + self.draw_model_select(frame, area); + } + AppState::ProviderConfig { .. } => { + self.draw_chat(frame, area); + self.draw_provider_config(frame, area); + } + } + } + + fn draw_chat(&self, frame: &mut Frame, area: Rect) { + let main_chunks = if self.show_sidebar { + Layout::default() + .direction(Direction::Horizontal) + .constraints([Constraint::Length(25), Constraint::Min(0)]) + .split(area) + } else { + Layout::default() + .direction(Direction::Horizontal) + .constraints([Constraint::Min(0)]) + .split(area) + }; + + let chat_area = if self.show_sidebar { + main_chunks[1] + } else { + main_chunks[0] + }; + + if self.show_sidebar { + self.draw_sidebar(frame, main_chunks[0]); + } + + let chunks = Layout::default() + .direction(Direction::Vertical) + .constraints([ + Constraint::Length(3), + Constraint::Min(0), + Constraint::Length(1), + Constraint::Length(6), + ]) + .split(chat_area); + + self.draw_header(frame, chunks[0]); + self.draw_messages(frame, chunks[1]); + self.draw_status_bar(frame, chunks[2]); + self.draw_input(frame, chunks[3]); + } + + fn draw_sidebar(&self, frame: &mut Frame, area: Rect) { + let provider_name = self + .current_provider() + .map(|p| p.name()) + .unwrap_or("No Provider"); + let model_name = self.current_model.as_deref().unwrap_or("No Model"); + + let items = vec![ + Line::from(Span::styled("Provider", Style::default().fg(Color::DarkGray))), + Line::from(Span::styled(provider_name, Style::default().fg(Color::Cyan))), + Line::raw(""), + Line::from(Span::styled("Model", Style::default().fg(Color::DarkGray))), + Line::from(Span::styled( + model_name, + Style::default().fg(Color::Green).add_modifier(Modifier::BOLD), + )), + Line::raw(""), + Line::from(Span::styled("Session", Style::default().fg(Color::DarkGray))), + Line::from(Span::styled( + format!("{} msgs", self.current_session.messages.len()), + Style::default().fg(Color::Yellow), + )), + ]; + + let block = Block::default() + .title(" Info ") + .borders(Borders::ALL) + .border_style(Style::default().fg(Color::DarkGray)); + let paragraph = Paragraph::new(Text::from(items)).block(block); + frame.render_widget(paragraph, area); + } + + fn draw_header(&self, frame: &mut Frame, area: Rect) { + let title = if self.is_streaming { + " Meow AI Chat ● Streaming... " + } else { + " Meow AI Chat " + }; + let header = Paragraph::new("") + .block( + Block::default() + .borders(Borders::ALL) + .title(title) + .title_alignment(Alignment::Center), + ) + .alignment(Alignment::Center); + frame.render_widget(header, area); + } + + fn draw_messages(&self, frame: &mut Frame, area: Rect) { + let mut all_lines: Vec = Vec::new(); + + for msg in &self.current_session.messages { + let (label_color, align_right) = match msg.role { + Role::User => (Color::Green, true), + Role::Assistant => (Color::Blue, false), + Role::System => (Color::Yellow, false), + }; + + let label = format!("[{}]", msg.role); + if align_right { + all_lines.push(Line::from(vec![ + Span::styled(" ", Style::default()), + Span::styled(label, Style::default().fg(label_color).add_modifier(Modifier::BOLD)), + ])); + } else { + all_lines.push(Line::from(Span::styled( + label, + Style::default().fg(label_color).add_modifier(Modifier::BOLD), + ))); + } + + let rendered = self.markdown_renderer.render(&msg.content); + for line in rendered { + if align_right { + let mut spans = line.spans.clone(); + spans.insert(0, Span::styled(" ", Style::default())); + all_lines.push(Line::from(spans)); + } else { + all_lines.push(line); + } + } + all_lines.push(Line::raw("")); + } + + if self.is_streaming && !self.stream_buffer.is_empty() { + all_lines.push(Line::from(Span::styled( + "[Assistant]", + Style::default().fg(Color::Blue).add_modifier(Modifier::BOLD), + ))); + let rendered = self.markdown_renderer.render(&self.stream_buffer); + for line in rendered { + all_lines.push(line); + } + } + + let total_lines = all_lines.len(); + let visible_height = area.height as usize; + let max_scroll = total_lines.saturating_sub(visible_height); + let scroll = self.messages_scroll.min(max_scroll); + + let paragraph = Paragraph::new(Text::from(all_lines)) + .wrap(Wrap { trim: false }) + .scroll((scroll as u16, 0)) + .block(Block::default().borders(Borders::ALL).title(" Messages ")); + + frame.render_widget(paragraph, area); + + if max_scroll > 0 { + let mut scrollbar_state = ScrollbarState::new(max_scroll).position(scroll); + let scrollbar_area = area.inner(Margin { + horizontal: 0, + vertical: 1, + }); + frame.render_stateful_widget( + Scrollbar::new(ScrollbarOrientation::VerticalRight) + .begin_symbol(Some("↑")) + .end_symbol(Some("↓")), + scrollbar_area, + &mut scrollbar_state, + ); + } + } + + fn draw_status_bar(&self, frame: &mut Frame, area: Rect) { + let status = self.status_message.as_deref().unwrap_or_else(|| { + if self.is_streaming { + "Press Ctrl+C to stop streaming" + } else { + "Ctrl+P: Models | Ctrl+S: Config | Ctrl+N: New Chat | Ctrl+B: Sidebar | Ctrl+Q: Quit" + } + }); + let status_bar = Paragraph::new(Span::styled(status, Style::default().fg(Color::DarkGray))) + .alignment(Alignment::Center); + frame.render_widget(status_bar, area); + } + + fn draw_input(&self, frame: &mut Frame, area: Rect) { + let cursor = self.input.cursor_position(); + let lines = self.input.lines(); + + let input_text: Vec = if lines.is_empty() { + vec![Line::from(Span::styled( + "Type a message... (Shift+Enter for newline, Enter to send)", + Style::default().fg(Color::DarkGray), + ))] + } else { + lines.iter().map(|l| Line::raw(l.as_str())).collect() + }; + + let block = Block::default() + .borders(Borders::ALL) + .title(" Input ") + .border_style(if self.is_streaming { + Style::default().fg(Color::DarkGray) + } else { + Style::default().fg(Color::White) + }); + + let paragraph = Paragraph::new(Text::from(input_text)).block(block); + frame.render_widget(paragraph, area); + + if !self.is_streaming { + let x = area.x + 1 + cursor.0 as u16; + let y = area.y + 1 + cursor.1 as u16; + frame.set_cursor_position((x, y)); + } + } + + fn draw_model_select(&self, frame: &mut Frame, area: Rect) { + if let AppState::ModelSelect { + models, + selected, + filtered, + filter_input, + } = &self.state + { + let popup_area = Self::centered_rect(60, 70, area); + frame.render_widget(Clear, popup_area); + + let items: Vec = filtered + .iter() + .enumerate() + .map(|(i, &idx)| { + let model = &models[idx]; + let style = if i == *selected { + Style::default() + .bg(Color::Blue) + .fg(Color::White) + .add_modifier(Modifier::BOLD) + } else { + Style::default() + }; + ListItem::new(model.id.clone()).style(style) + }) + .collect(); + + let filter_text = if filter_input.is_empty() { + "Type to filter...".to_string() + } else { + filter_input.clone() + }; + + let list = List::new(items) + .block( + Block::default() + .borders(Borders::ALL) + .title(format!(" Select Model | {} ", filter_text)), + ) + .highlight_symbol("> "); + + frame.render_widget(list, popup_area); + } + } + + fn draw_provider_config(&self, frame: &mut Frame, area: Rect) { + if let AppState::ProviderConfig { form, editing } = &self.state { + let popup_area = Self::centered_rect(70, 60, area); + frame.render_widget(Clear, popup_area); + + let title = if editing.is_some() { + " Edit Provider " + } else { + " Add Provider (First Setup) " + }; + + let fields = vec![ + ("Name", &form.name, 0), + ("Base URL", &form.base_url, 1), + ("API Key", &form.api_key, 2), + ("Default Model (optional)", &form.default_model, 3), + ]; + + let mut lines: Vec = Vec::new(); + for (label, value, idx) in fields { + let is_focused = form.focus == idx; + let label_style = if is_focused { + Style::default().fg(Color::Yellow).add_modifier(Modifier::BOLD) + } else { + Style::default().fg(Color::DarkGray) + }; + let value_style = if is_focused { + Style::default().fg(Color::White).add_modifier(Modifier::BOLD) + } else { + Style::default() + }; + lines.push(Line::from(vec![ + Span::styled(format!("{}: ", label), label_style), + Span::styled(value.clone(), value_style), + ])); + lines.push(Line::raw("")); + } + + lines.push(Line::from(Span::styled( + "Tab: Next field | Enter: Save | Esc: Cancel", + Style::default().fg(Color::DarkGray), + ))); + + let block = Block::default() + .borders(Borders::ALL) + .title(title) + .border_style(Style::default().fg(Color::Yellow)); + let paragraph = Paragraph::new(Text::from(lines)).block(block); + frame.render_widget(paragraph, popup_area); + } + } + + fn centered_rect(percent_x: u16, percent_y: u16, r: Rect) -> Rect { + let popup_layout = Layout::default() + .direction(Direction::Vertical) + .constraints([ + Constraint::Percentage((100 - percent_y) / 2), + Constraint::Percentage(percent_y), + Constraint::Percentage((100 - percent_y) / 2), + ]) + .split(r); + + Layout::default() + .direction(Direction::Horizontal) + .constraints([ + Constraint::Percentage((100 - percent_x) / 2), + Constraint::Percentage(percent_x), + Constraint::Percentage((100 - percent_x) / 2), + ]) + .split(popup_layout[1])[1] + } + + pub fn scroll_messages(&mut self, delta: i32) { + let _total = self.current_session.messages.len() + + if self.is_streaming { 5 } else { 0 }; + if delta < 0 { + self.messages_scroll = self.messages_scroll.saturating_sub((-delta) as usize); + } else { + self.messages_scroll = self.messages_scroll.saturating_add(delta as usize); + } + } +} + +use futures::StreamExt; diff --git a/src/config.rs b/src/config.rs new file mode 100644 index 0000000..acd298e --- /dev/null +++ b/src/config.rs @@ -0,0 +1,65 @@ +use anyhow::{Context, Result}; +use serde::{Deserialize, Serialize}; +use std::path::PathBuf; + +#[derive(Debug, Clone, Serialize, Deserialize, Default)] +pub struct ProviderConfig { + pub name: String, + pub base_url: String, + pub api_key: String, + pub default_model: Option, +} + +#[derive(Debug, Clone, Serialize, Deserialize, Default)] +pub struct Config { + pub providers: Vec, +} + +impl Config { + pub fn meow_dir() -> PathBuf { + dirs::home_dir() + .expect("Failed to get home directory") + .join(".meow") + } + + pub fn config_path() -> PathBuf { + Self::meow_dir().join("config.toml") + } + + pub fn data_dir() -> PathBuf { + Self::meow_dir().join("data") + } + + pub fn sessions_dir() -> PathBuf { + Self::data_dir().join("sessions") + } + + pub fn load() -> Result { + let path = Self::config_path(); + if !path.exists() { + return Ok(Self::default()); + } + let content = std::fs::read_to_string(&path) + .with_context(|| format!("Failed to read config from {}", path.display()))?; + let config = toml::from_str(&content) + .with_context(|| format!("Failed to parse config from {}", path.display()))?; + Ok(config) + } + + pub fn save(&self) -> Result<()> { + let path = Self::config_path(); + if let Some(parent) = path.parent() { + std::fs::create_dir_all(parent) + .with_context(|| format!("Failed to create directory {}", parent.display()))?; + } + let content = toml::to_string_pretty(self) + .context("Failed to serialize config")?; + std::fs::write(&path, content) + .with_context(|| format!("Failed to write config to {}", path.display()))?; + Ok(()) + } + + pub fn is_empty(&self) -> bool { + self.providers.is_empty() + } +} diff --git a/src/main.rs b/src/main.rs new file mode 100644 index 0000000..f983df4 --- /dev/null +++ b/src/main.rs @@ -0,0 +1,65 @@ +mod app; +mod config; +mod message; +mod providers; +mod storage; +mod tui; + +use anyhow::Result; +use app::App; +use crossterm::event::{self, Event, MouseEventKind}; +use std::time::Duration; +use tui::Tui; + +#[tokio::main] +async fn main() -> Result<()> { + let mut tui = Tui::new()?; + tui.enter()?; + + let mut app = App::new().await?; + + let mut last_tick = std::time::Instant::now(); + let tick_rate = Duration::from_millis(100); + + loop { + tui.draw(|frame| app.draw(frame))?; + + let timeout = tick_rate + .checked_sub(last_tick.elapsed()) + .unwrap_or_else(|| Duration::from_secs(0)); + + if event::poll(timeout)? { + match event::read()? { + Event::Key(key) => { + if key.kind == event::KeyEventKind::Press { + app.on_key_event(key).await?; + } + } + Event::Mouse(mouse) => { + if let MouseEventKind::ScrollUp = mouse.kind { + app.scroll_messages(-3); + } else if let MouseEventKind::ScrollDown = mouse.kind { + app.scroll_messages(3); + } + } + Event::Resize(_, _) => {} + _ => {} + } + } + + if app.poll_stream() { + // Stream updated, redraw will happen on next loop iteration + } + + if app.quit { + break; + } + + if last_tick.elapsed() >= tick_rate { + last_tick = std::time::Instant::now(); + } + } + + tui.exit()?; + Ok(()) +} diff --git a/src/message.rs b/src/message.rs new file mode 100644 index 0000000..e0420d8 --- /dev/null +++ b/src/message.rs @@ -0,0 +1,74 @@ +use chrono::{DateTime, Utc}; +use serde::{Deserialize, Serialize}; +use uuid::Uuid; + +#[derive(Debug, Clone, Copy, PartialEq, Eq, Serialize, Deserialize)] +pub enum Role { + System, + User, + Assistant, +} + +impl std::fmt::Display for Role { + fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result { + match self { + Role::System => write!(f, "System"), + Role::User => write!(f, "User"), + Role::Assistant => write!(f, "Assistant"), + } + } +} + +#[derive(Debug, Clone, Serialize, Deserialize)] +pub struct Message { + pub id: Uuid, + pub role: Role, + pub content: String, + pub created_at: DateTime, +} + +impl Message { + pub fn new(role: Role, content: impl Into) -> Self { + Self { + id: Uuid::new_v4(), + role, + content: content.into(), + created_at: Utc::now(), + } + } + + pub fn system(content: impl Into) -> Self { + Self::new(Role::System, content) + } + + pub fn user(content: impl Into) -> Self { + Self::new(Role::User, content) + } + + pub fn assistant(content: impl Into) -> Self { + Self::new(Role::Assistant, content) + } +} + +#[derive(Debug, Clone, Serialize, Deserialize)] +pub struct ChatSession { + pub id: Uuid, + pub title: String, + pub created_at: DateTime, + pub messages: Vec, +} + +impl ChatSession { + pub fn new(title: impl Into) -> Self { + Self { + id: Uuid::new_v4(), + title: title.into(), + created_at: Utc::now(), + messages: Vec::new(), + } + } + + pub fn add_message(&mut self, message: Message) { + self.messages.push(message); + } +} diff --git a/src/providers/mod.rs b/src/providers/mod.rs new file mode 100644 index 0000000..427204a --- /dev/null +++ b/src/providers/mod.rs @@ -0,0 +1,39 @@ +pub mod openai; + +use crate::{config::ProviderConfig, message::Message}; +use async_trait::async_trait; +use futures::stream::BoxStream; +use serde::{Deserialize, Serialize}; +use thiserror::Error; + +#[derive(Debug, Clone, Serialize, Deserialize)] +pub struct Model { + pub id: String, + pub name: String, +} + +#[derive(Error, Debug)] +pub enum ProviderError { + #[error("HTTP error: {0}")] + Http(#[from] reqwest::Error), + #[error("API error: {message}")] + Api { message: String }, + #[error("JSON parse error: {0}")] + Json(#[from] serde_json::Error), + #[error("Stream parse error: {0}")] + StreamParse(String), +} + +#[async_trait] +pub trait Provider: Send + Sync { + fn name(&self) -> &str; + fn config(&self) -> &ProviderConfig; + + async fn list_models(&self) -> Result, ProviderError>; + + async fn chat_stream( + &self, + model: &str, + messages: &[Message], + ) -> Result>, ProviderError>; +} diff --git a/src/providers/openai.rs b/src/providers/openai.rs new file mode 100644 index 0000000..7411d64 --- /dev/null +++ b/src/providers/openai.rs @@ -0,0 +1,186 @@ +use crate::{ + config::ProviderConfig, + message::{Message, Role}, + providers::{Model, Provider, ProviderError}, +}; +use async_trait::async_trait; +use futures::{stream::BoxStream, StreamExt}; +use serde::{Deserialize, Serialize}; + +pub struct OpenAICompatibleProvider { + config: ProviderConfig, + client: reqwest::Client, +} + +impl OpenAICompatibleProvider { + pub fn new(config: ProviderConfig) -> Self { + Self { + config, + client: reqwest::Client::new(), + } + } + + fn api_url(&self, path: &str) -> String { + let base = self.config.base_url.trim_end_matches('/'); + format!("{}{}", base, path) + } +} + +#[async_trait] +impl Provider for OpenAICompatibleProvider { + fn name(&self) -> &str { + &self.config.name + } + + fn config(&self) -> &ProviderConfig { + &self.config + } + + async fn list_models(&self) -> Result, ProviderError> { + let response = self + .client + .get(self.api_url("/v1/models")) + .header("Authorization", format!("Bearer {}", self.config.api_key)) + .send() + .await?; + + if !response.status().is_success() { + let text = response.text().await.unwrap_or_default(); + return Err(ProviderError::Api { message: text }); + } + + let data: ModelsResponse = response.json().await?; + Ok(data + .data + .into_iter() + .map(|m| Model { + id: m.id.clone(), + name: m.id, + }) + .collect()) + } + + async fn chat_stream( + &self, + model: &str, + messages: &[Message], + ) -> Result>, ProviderError> { + let body = ChatCompletionRequest { + model: model.to_string(), + messages: messages.iter().map(|m| ChatMessage::from(m.clone())).collect(), + stream: true, + }; + + let response = self + .client + .post(self.api_url("/v1/chat/completions")) + .header("Authorization", format!("Bearer {}", self.config.api_key)) + .header("Content-Type", "application/json") + .json(&body) + .send() + .await?; + + if !response.status().is_success() { + let text = response.text().await.unwrap_or_default(); + return Err(ProviderError::Api { message: text }); + } + + let stream = response.bytes_stream().map(move |result| { + result.map_err(ProviderError::Http) + }); + + let parsed = stream + .flat_map(|result| { + futures::stream::iter(match result { + Ok(bytes) => parse_sse_chunk(&bytes), + Err(e) => vec![Err(e)], + }) + }) + .boxed(); + + Ok(parsed) + } +} + +fn parse_sse_chunk(bytes: &[u8]) -> Vec> { + let text = String::from_utf8_lossy(bytes); + let mut results = Vec::new(); + + for line in text.lines() { + let line = line.trim(); + if !line.starts_with("data: ") { + continue; + } + let data = &line[6..]; + if data == "[DONE]" { + break; + } + match serde_json::from_str::(data) { + Ok(chunk) => { + if let Some(choice) = chunk.choices.first() { + if let Some(content) = &choice.delta.content { + if !content.is_empty() { + results.push(Ok(content.clone())); + } + } + } + } + Err(e) => { + results.push(Err(ProviderError::StreamParse(e.to_string()))); + } + } + } + + results +} + +#[derive(Debug, Deserialize)] +struct ModelsResponse { + data: Vec, +} + +#[derive(Debug, Deserialize)] +struct ModelData { + id: String, +} + +#[derive(Debug, Serialize)] +struct ChatCompletionRequest { + model: String, + messages: Vec, + stream: bool, +} + +#[derive(Debug, Serialize, Deserialize, Clone)] +struct ChatMessage { + role: String, + content: String, +} + +impl From for ChatMessage { + fn from(msg: Message) -> Self { + Self { + role: match msg.role { + Role::System => "system".to_string(), + Role::User => "user".to_string(), + Role::Assistant => "assistant".to_string(), + }, + content: msg.content, + } + } +} + +#[derive(Debug, Deserialize)] +struct ChatCompletionChunk { + choices: Vec, +} + +#[derive(Debug, Deserialize)] +struct Choice { + delta: Delta, +} + +#[derive(Debug, Deserialize)] +struct Delta { + content: Option, +} diff --git a/src/storage.rs b/src/storage.rs new file mode 100644 index 0000000..41678b6 --- /dev/null +++ b/src/storage.rs @@ -0,0 +1,82 @@ +use crate::{config::Config, message::Message}; +use anyhow::{Context, Result}; +use std::fs::OpenOptions; +use std::io::{BufRead, Write}; +use uuid::Uuid; + +pub struct Storage; + +impl Storage { + pub fn session_path(session_id: Uuid) -> std::path::PathBuf { + Config::sessions_dir().join(format!("{}.jsonl", session_id)) + } + + pub fn load_session(session_id: Uuid) -> Result> { + let path = Self::session_path(session_id); + if !path.exists() { + return Ok(Vec::new()); + } + let file = std::fs::File::open(&path) + .with_context(|| format!("Failed to open session file {}", path.display()))?; + let reader = std::io::BufReader::new(file); + let mut messages = Vec::new(); + for line in reader.lines() { + let line = line?; + if line.trim().is_empty() { + continue; + } + let message: Message = serde_json::from_str(&line) + .with_context(|| format!("Failed to parse message in session {}", session_id))?; + messages.push(message); + } + Ok(messages) + } + + pub fn append_message(session_id: Uuid, message: &Message) -> Result<()> { + let path = Self::session_path(session_id); + if let Some(parent) = path.parent() { + std::fs::create_dir_all(parent) + .with_context(|| format!("Failed to create directory {}", parent.display()))?; + } + let mut file = OpenOptions::new() + .create(true) + .append(true) + .open(&path) + .with_context(|| format!("Failed to open session file {}", path.display()))?; + let json = serde_json::to_string(message)?; + writeln!(file, "{}", json)?; + file.flush()?; + Ok(()) + } + + pub fn list_sessions() -> Result> { + let dir = Config::sessions_dir(); + if !dir.exists() { + return Ok(Vec::new()); + } + let mut sessions = Vec::new(); + for entry in std::fs::read_dir(&dir) + .with_context(|| format!("Failed to read sessions dir {}", dir.display()))? + { + let entry = entry?; + let path = entry.path(); + if let Some(ext) = path.extension() { + if ext != "jsonl" { + continue; + } + } + if let Some(stem) = path.file_stem() { + if let Ok(id) = Uuid::parse_str(&stem.to_string_lossy()) { + let count = Self::count_messages(id)?; + sessions.push((id, count)); + } + } + } + Ok(sessions) + } + + fn count_messages(session_id: Uuid) -> Result { + let messages = Self::load_session(session_id)?; + Ok(messages.len()) + } +} diff --git a/src/tui/input.rs b/src/tui/input.rs new file mode 100644 index 0000000..614a533 --- /dev/null +++ b/src/tui/input.rs @@ -0,0 +1,218 @@ +use crossterm::event::{KeyCode, KeyEvent, KeyModifiers}; + +#[derive(Debug, Clone)] +pub struct InputState { + lines: Vec, + cursor_row: usize, + cursor_col: usize, +} + +impl Default for InputState { + fn default() -> Self { + Self::new() + } +} + +impl InputState { + pub fn new() -> Self { + Self { + lines: vec![String::new()], + cursor_row: 0, + cursor_col: 0, + } + } + + pub fn text(&self) -> String { + self.lines.join("\n") + } + + pub fn is_empty(&self) -> bool { + self.lines.len() == 1 && self.lines[0].is_empty() + } + + pub fn clear(&mut self) { + self.lines = vec![String::new()]; + self.cursor_row = 0; + self.cursor_col = 0; + } + + pub fn handle_key_event(&mut self, key: KeyEvent) -> InputAction { + match (key.code, key.modifiers) { + (KeyCode::Char(c), KeyModifiers::NONE) + | (KeyCode::Char(c), KeyModifiers::SHIFT) => { + self.insert_char(c); + InputAction::Typed + } + (KeyCode::Enter, KeyModifiers::NONE) => { + InputAction::Submit + } + (KeyCode::Enter, KeyModifiers::SHIFT) => { + self.insert_newline(); + InputAction::Typed + } + (KeyCode::Backspace, _) => { + self.backspace(); + InputAction::Typed + } + (KeyCode::Delete, _) => { + self.delete(); + InputAction::Typed + } + (KeyCode::Left, _) => { + self.move_left(); + InputAction::CursorMoved + } + (KeyCode::Right, _) => { + self.move_right(); + InputAction::CursorMoved + } + (KeyCode::Up, _) => { + self.move_up(); + InputAction::CursorMoved + } + (KeyCode::Down, _) => { + self.move_down(); + InputAction::CursorMoved + } + (KeyCode::Home, _) | (KeyCode::Char('a'), KeyModifiers::CONTROL) => { + self.cursor_col = 0; + InputAction::CursorMoved + } + (KeyCode::End, _) | (KeyCode::Char('e'), KeyModifiers::CONTROL) => { + self.cursor_col = char_count(&self.lines[self.cursor_row]); + InputAction::CursorMoved + } + _ => InputAction::None, + } + } + + fn insert_char(&mut self, c: char) { + let line = &mut self.lines[self.cursor_row]; + let byte_idx = byte_index(line, self.cursor_col); + line.insert(byte_idx, c); + self.cursor_col += 1; + } + + fn insert_newline(&mut self) { + let line = &mut self.lines[self.cursor_row]; + let byte_idx = byte_index(line, self.cursor_col); + let rest: String = line.split_off(byte_idx); + self.cursor_row += 1; + self.cursor_col = 0; + self.lines.insert(self.cursor_row, rest); + } + + fn backspace(&mut self) { + if self.cursor_col > 0 { + let line = &mut self.lines[self.cursor_row]; + let start = byte_index(line, self.cursor_col - 1); + let end = byte_index(line, self.cursor_col); + line.drain(start..end); + self.cursor_col -= 1; + } else if self.cursor_row > 0 { + let removed = self.lines.remove(self.cursor_row); + self.cursor_row -= 1; + self.cursor_col = char_count(&self.lines[self.cursor_row]); + self.lines[self.cursor_row].push_str(&removed); + } + } + + fn delete(&mut self) { + let line = &self.lines[self.cursor_row]; + if self.cursor_col < char_count(line) { + let line = &mut self.lines[self.cursor_row]; + let start = byte_index(line, self.cursor_col); + let end = byte_index(line, self.cursor_col + 1); + line.drain(start..end); + } else if self.cursor_row + 1 < self.lines.len() { + let next = self.lines.remove(self.cursor_row + 1); + self.lines[self.cursor_row].push_str(&next); + } + } + + fn move_left(&mut self) { + if self.cursor_col > 0 { + self.cursor_col -= 1; + } else if self.cursor_row > 0 { + self.cursor_row -= 1; + self.cursor_col = char_count(&self.lines[self.cursor_row]); + } + } + + fn move_right(&mut self) { + if self.cursor_col < char_count(&self.lines[self.cursor_row]) { + self.cursor_col += 1; + } else if self.cursor_row + 1 < self.lines.len() { + self.cursor_row += 1; + self.cursor_col = 0; + } + } + + fn move_up(&mut self) { + if self.cursor_row > 0 { + self.cursor_row -= 1; + self.cursor_col = self.cursor_col.min(char_count(&self.lines[self.cursor_row])); + } + } + + fn move_down(&mut self) { + if self.cursor_row + 1 < self.lines.len() { + self.cursor_row += 1; + self.cursor_col = self.cursor_col.min(char_count(&self.lines[self.cursor_row])); + } + } + + pub fn cursor_position(&self) -> (usize, usize) { + let line = &self.lines[self.cursor_row]; + let byte_idx = byte_index(line, self.cursor_col); + let display_col = display_width(&line[..byte_idx]); + (display_col, self.cursor_row) + } + + pub fn lines(&self) -> &[String] { + &self.lines + } +} + +fn char_count(s: &str) -> usize { + s.chars().count() +} + +fn byte_index(s: &str, char_idx: usize) -> usize { + s.char_indices() + .nth(char_idx) + .map(|(i, _)| i) + .unwrap_or(s.len()) +} + +fn display_width(s: &str) -> usize { + s.chars() + .map(|c| { + let cp = c as u32; + // CJK characters and other full-width characters + if (0x1100..=0x115F).contains(&cp) + || (0x2E80..=0xA4CF).contains(&cp) + || (0xAC00..=0xD7A3).contains(&cp) + || (0xF900..=0xFAFF).contains(&cp) + || (0xFE10..=0xFE19).contains(&cp) + || (0xFE30..=0xFE6F).contains(&cp) + || (0xFF00..=0xFF60).contains(&cp) + || (0xFFE0..=0xFFE6).contains(&cp) + || (0x20000..=0x2FFFD).contains(&cp) + || (0x30000..=0x3FFFD).contains(&cp) + { + 2 + } else { + 1 + } + }) + .sum() +} + +#[derive(Debug, Clone, Copy, PartialEq, Eq)] +pub enum InputAction { + None, + Typed, + CursorMoved, + Submit, +} diff --git a/src/tui/markdown.rs b/src/tui/markdown.rs new file mode 100644 index 0000000..a3d6bf3 --- /dev/null +++ b/src/tui/markdown.rs @@ -0,0 +1,211 @@ +use pulldown_cmark::{CodeBlockKind, Event, Parser, Tag, TagEnd}; +use ratatui::{ + style::{Color, Modifier, Style}, + text::{Line, Span}, +}; +use syntect::{ + easy::HighlightLines, + highlighting::{ThemeSet, Style as SyntectStyle}, + parsing::SyntaxSet, + util::LinesWithEndings, +}; + +pub struct MarkdownRenderer { + syntax_set: SyntaxSet, + theme_set: ThemeSet, +} + +impl MarkdownRenderer { + pub fn new() -> Self { + Self { + syntax_set: SyntaxSet::load_defaults_newlines(), + theme_set: ThemeSet::load_defaults(), + } + } + + pub fn render(&self, markdown: &str) -> Vec> { + let parser = Parser::new(markdown); + let mut lines: Vec = Vec::new(); + let mut current_spans: Vec = Vec::new(); + let mut style_stack: Vec