get basic tui working with Ratatui

1 files changed, 66 insertions, 0 deletions

diff --git a/src/tui.rs b/src/tui.rs
new file mode 100755
index 0000000..5c94b3b
--- /dev/null
+++ b/src/tui.rs
@@ -0,0 +1,66 @@
+use crate::connection::Connection;
+use crate::ui;
+use crossterm::event::{DisableMouseCapture, EnableMouseCapture};
+use crossterm::{
+    terminal::{self, *},
+};
+use ratatui::prelude::*;
+use std::io::{self, stdout, Stdout};
+use std::panic;
+
+use crate::app::{App, AppResult};
+use crate::event::EventHandler;
+
+pub type CrosstermTerminal = ratatui::Terminal<ratatui::backend::CrosstermBackend<std::io::Stderr>>;
+
+#[derive(Debug)]
+pub struct Tui {
+    terminal: CrosstermTerminal,
+    pub events: EventHandler,
+}
+
+impl Tui {
+    pub fn new(terminal: CrosstermTerminal, events: EventHandler) -> Self {
+        Self { terminal, events }
+    }
+
+    pub fn init(&mut self) -> AppResult<()> {
+        terminal::enable_raw_mode()?;
+        crossterm::execute!(io::stdout(), EnterAlternateScreen, EnableMouseCapture)?;
+
+        let panic_hook = panic::take_hook();
+        panic::set_hook(Box::new(move |panic| {
+            Self::reset().expect("failed to reset the terminal");
+            panic_hook(panic);
+        }));
+        Ok(())
+    }
+
+    /// [`Draw`] the terminal interface by [`rendering`] the widgets.
+    ///
+    /// [`Draw`]: ratatui::Terminal::draw
+    /// [`rendering`]: crate::ui::render
+    pub fn draw(&mut self, app: &mut App) -> AppResult<()> {
+        self.terminal.draw(|frame| ui::render(app, frame))?;
+        Ok(())
+    }
+
+    /// Resets the terminal interface.
+    ///
+    /// This function is also used for the panic hook to revert
+    /// the terminal properties if unexpected errors occur.
+    fn reset() -> AppResult<()> {
+        terminal::disable_raw_mode()?;
+        crossterm::execute!(io::stderr(), LeaveAlternateScreen, DisableMouseCapture)?;
+        Ok(())
+    }
+
+    /// Exits the terminal interface.
+    ///
+    /// It disables the raw mode and reverts back the terminal properties.
+    pub fn exit(&mut self) -> AppResult<()> {
+        Self::reset()?;
+        self.terminal.show_cursor()?;
+        Ok(())
+    }
+}