UI is async and event driven now, backend code needs to be linked up to the message queues correctly next.

src/ui/mod.rs

@@ -1,3 +1,17 @@
+use std::io::IsTerminal;
+
+use crossterm::terminal::{
+    EnterAlternateScreen, LeaveAlternateScreen, disable_raw_mode, enable_raw_mode,
+};
+
+use crossterm::event::{
+    self, DisableMouseCapture, EnableMouseCapture, Event, Event as CEvent, EventStream, KeyCode,
+    MouseButton,
+};
+
+use ratatui::CompletedFrame;
+use ratatui::prelude::Backend;
+use ratatui::{Frame, Terminal, backend::CrosstermBackend};
 use ratatui::{
     layout::{Constraint, Direction, Layout},
     style::{Color, Style},
@@ -5,53 +19,91 @@ use ratatui::{
     widgets::{Block, Borders, Paragraph},
 };
 
-pub fn chat_ui(f: &mut ratatui::Frame, app: &crate::AppState) {
-    let chunks = Layout::default()
-        .direction(Direction::Vertical)
-        .margin(1)
-        .constraints([Constraint::Min(1), Constraint::Length(3)].as_ref())
-        .split(f.area());
+use crate::AppState;
 
-    let chat_messages: Vec<Line> = app
-        .messages
-        .iter()
-        .map(|m| {
-            Line::from(Span::raw(format!(
-                "{}: {}",
-                m.role.to_string(),
-                m.to_string()
-            )))
-        })
-        .collect();
-
-    let messages_block = Paragraph::new(ratatui::text::Text::from(chat_messages))
-        .block(Block::default().borders(Borders::ALL).title("Chat"))
-        .wrap(ratatui::widgets::Wrap { trim: true })
-        .scroll((
-            app.messages
-                .len()
-                .saturating_sub((chunks[0].height - 2) as usize) as u16,
-            0,
-        ));
-
-    f.render_widget(messages_block, chunks[0]);
-
-    let input_text = if app.waiting {
-        format!("> {} (waiting...)", &app.prompt)
-    } else {
-        format!("> {}", app.prompt)
-    };
-
-    let input = Paragraph::new(input_text)
-        .style(Style::default().fg(Color::Yellow))
-        .block(Block::default().borders(Borders::ALL).title("Input"));
-    f.render_widget(input, chunks[1]);
-
-    use ratatui::layout::Position;
-    f.set_cursor_position(Position::new(
-        // the +3 comes from the 3 'characters' of space between the terminal edge and the text location
-        // this places the text cursor after the last entered character
-        chunks[1].x + app.prompt.len() as u16 + 3,
-        chunks[1].y + 1,
-    ));
+pub struct OxiTerminal {
+    handle: Terminal<CrosstermBackend<std::io::Stdout>>,
+}
+
+impl OxiTerminal {
+    pub fn setup() -> Self {
+        enable_raw_mode(); // crossterm
+        let mut stdout_handle = std::io::stdout();
+        crossterm::execute!(stdout_handle, EnterAlternateScreen, EnableMouseCapture);
+        let backend = CrosstermBackend::new(stdout_handle);
+        let mut handle = Terminal::new(backend).expect("unable to open a terminal");
+        handle.clear();
+
+        OxiTerminal { handle }
+    }
+
+    pub fn do_draw(&mut self, app: &AppState) -> CompletedFrame {
+        self.handle
+            .draw(|f| OxiTerminal::chat_ui(f, app))
+            .expect("failed to draw to framebuffer")
+    }
+
+    pub fn term_cleanup(&mut self) -> anyhow::Result<()> {
+        disable_raw_mode()?;
+        crossterm::execute!(
+            self.handle.backend_mut(),
+            LeaveAlternateScreen,
+            DisableMouseCapture
+        )?;
+        self.handle.show_cursor()?;
+
+        Ok(())
+    }
+
+    //FIXME: awaiting refactor
+    pub fn chat_ui(f: &mut ratatui::Frame, app: &crate::AppState) {
+        let chunks = Layout::default()
+            .direction(Direction::Vertical)
+            .margin(1)
+            .constraints([Constraint::Min(1), Constraint::Length(3)].as_ref())
+            .split(f.area());
+
+        let chat_messages: Vec<Line> = app
+            .messages
+            .iter()
+            .map(|m| {
+                Line::from(Span::raw(format!(
+                    "{}: {}",
+                    m.role.to_string(),
+                    m.to_string()
+                )))
+            })
+            .collect();
+
+        let messages_block = Paragraph::new(ratatui::text::Text::from(chat_messages))
+            .block(Block::default().borders(Borders::ALL).title("Chat"))
+            .wrap(ratatui::widgets::Wrap { trim: true })
+            .scroll((
+                app.messages
+                    .len()
+                    .saturating_sub((chunks[0].height - 2) as usize) as u16,
+                0,
+            ));
+
+        f.render_widget(messages_block, chunks[0]);
+
+        let input_text = if app.waiting {
+            format!("> {} (waiting...)", &app.prompt)
+        } else {
+            format!("> {}", app.prompt)
+        };
+
+        let input = Paragraph::new(input_text)
+            .style(Style::default().fg(Color::Yellow))
+            .block(Block::default().borders(Borders::ALL).title("Input"));
+        f.render_widget(input, chunks[1]);
+
+        use ratatui::layout::Position;
+        f.set_cursor_position(Position::new(
+            // the +3 comes from the 3 'characters' of space between the terminal edge and the text location
+            // this places the text cursor after the last entered character
+            chunks[1].x + app.prompt.len() as u16 + 3,
+            chunks[1].y + 1,
+        ));
+    }
 }