commit 16ce05f554434d7dfbc7dedb028540bb694df0c3
Author: Jarkko Toivanen <jt@jakest.us>
Date:   Tue Jul 30 20:42:11 2024 +0300

    Initial testing

diff --git a/.gitignore b/.gitignore
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diff --git a/Cargo.toml b/Cargo.toml
new file mode 100644
index 0000000..34f64c6
--- /dev/null
+++ b/Cargo.toml
@@ -0,0 +1,8 @@
+[package]
+name = "liima"
+version = "0.1.0"
+edition = "2021"
+
+[dependencies]
+color-eyre = "0.6.3"
+ratatui = "0.27.0"
diff --git a/src/main.rs b/src/main.rs
new file mode 100644
index 0000000..f0715b8
--- /dev/null
+++ b/src/main.rs
@@ -0,0 +1,125 @@
+use std::panic;
+use std::io;
+use std::io::Result;
+use ratatui::{
+    buffer::Buffer,
+    crossterm::event::{
+    	self,
+    	Event,
+    	KeyCode,
+    	KeyEvent,
+    	KeyEventKind
+    },
+    layout::{Alignment, Rect},
+    style::Stylize,
+    symbols::border,
+    text::{Line, Text},
+    widgets::{
+        block::{Position, Title},
+        Block, Paragraph, Widget,
+    },
+    Frame,
+};
+
+mod tui;
+
+#[cfg(test)]
+mod test;
+
+#[derive(Debug, Default)]
+pub struct App {
+	counter: u8,
+	exit: bool,
+}
+
+fn main() -> Result<()> {
+	// Setup panic handling
+	let default_panic = panic::take_hook();
+	panic::set_hook(Box::new(move |info| {
+		let _= tui::restore();
+		default_panic(info);
+	}));
+
+	let mut terminal = tui::init()?;
+	App::default().run(&mut terminal)?;
+	tui::restore()?;
+	Ok(())
+}
+
+impl App {
+	// Main app loop until quit
+	pub fn run(&mut self, terminal: &mut tui::Tui) -> Result<()> {
+		while !self.exit {
+			terminal.draw(|frame| self.render_frame(frame))?;
+			self.handle_events()?;
+		}
+		Ok(())
+	}
+	
+	fn render_frame(&self, frame: &mut Frame) {
+		frame.render_widget(self, frame.size());
+	}
+	
+	fn handle_events(&mut self) -> io::Result<()> {
+		match event::read()? {
+			Event::Key(key_event) if key_event.kind == KeyEventKind::Press => {
+				self.handle_key_event(key_event)
+			}
+			_ => {}
+		};
+		Ok(())
+	}
+
+	fn handle_key_event(&mut self, key_event: KeyEvent) {
+		match key_event.code {
+			KeyCode::Char('q') => self.exit(),
+			KeyCode::Left => self.decrement_counter(),
+			KeyCode::Right => self.increment_counter(),
+			_ => {}
+		}
+	}
+
+	fn exit(&mut self) {
+		self.exit = true;
+	}
+
+	fn increment_counter(&mut self) {
+		self.counter += 1;
+	}
+
+	fn decrement_counter(&mut self) {
+		self.counter -= 1;
+	}
+}
+
+impl Widget for &App {
+    fn render(self, area: Rect, buf: &mut Buffer) {
+        let title = Title::from(" Counter App Tutorial ".bold());
+        let instructions = Title::from(Line::from(vec![
+            " Decrement ".into(),
+            "<Left>".blue().bold(),
+            " Increment ".into(),
+            "<Right>".blue().bold(),
+            " Quit ".into(),
+            "<Q> ".blue().bold(),
+        ]));
+        let block = Block::bordered()
+            .title(title.alignment(Alignment::Center))
+            .title(
+                instructions
+                    .alignment(Alignment::Center)
+                    .position(Position::Bottom),
+            )
+            .border_set(border::THICK);
+
+        let counter_text = Text::from(vec![Line::from(vec![
+            "Value: ".into(),
+            self.counter.to_string().yellow(),
+        ])]);
+
+        Paragraph::new(counter_text)
+            .centered()
+            .block(block)
+            .render(area, buf);
+    }
+}
diff --git a/src/test.rs b/src/test.rs
new file mode 100644
index 0000000..1b2c873
--- /dev/null
+++ b/src/test.rs
@@ -0,0 +1,45 @@
+use super::*;
+    use ratatui::style::Style;
+
+    #[test]
+    fn render() {
+        let app = App::default();
+        let mut buf = Buffer::empty(Rect::new(0, 0, 50, 4));
+
+        app.render(buf.area, &mut buf);
+
+        let mut expected = Buffer::with_lines(vec![
+            "┏━━━━━━━━━━━━━ Counter App Tutorial ━━━━━━━━━━━━━┓",
+            "┃                    Value: 0                    ┃",
+            "┃                                                ┃",
+            "┗━ Decrement <Left> Increment <Right> Quit <Q> ━━┛",
+        ]);
+        let title_style = Style::new().bold();
+        let counter_style = Style::new().yellow();
+        let key_style = Style::new().blue().bold();
+        expected.set_style(Rect::new(14, 0, 22, 1), title_style);
+        expected.set_style(Rect::new(28, 1, 1, 1), counter_style);
+        expected.set_style(Rect::new(13, 3, 6, 1), key_style);
+        expected.set_style(Rect::new(30, 3, 7, 1), key_style);
+        expected.set_style(Rect::new(43, 3, 4, 1), key_style);
+
+        // note ratatui also has an assert_buffer_eq! macro that can be used to
+        // compare buffers and display the differences in a more readable way
+        assert_eq!(buf, expected);
+    }
+
+    #[test]
+    fn handle_key_event() -> io::Result<()> {
+        let mut app = App::default();
+        app.handle_key_event(KeyCode::Right.into());
+        assert_eq!(app.counter, 1);
+
+        app.handle_key_event(KeyCode::Left.into());
+        assert_eq!(app.counter, 0);
+
+        let mut app = App::default();
+        app.handle_key_event(KeyCode::Char('q').into());
+        assert_eq!(app.exit, true);
+
+        Ok(())
+    }
diff --git a/src/tui.rs b/src/tui.rs
new file mode 100644
index 0000000..d0d520d
--- /dev/null
+++ b/src/tui.rs
@@ -0,0 +1,35 @@
+use std::io::{self, stdout, Stdout};
+use ratatui::{
+	backend::CrosstermBackend,
+		crossterm::{
+			execute,
+			terminal::{
+				disable_raw_mode,
+				enable_raw_mode,
+				EnterAlternateScreen,
+				LeaveAlternateScreen,
+			},
+			event::{
+				EnableMouseCapture,
+				DisableMouseCapture,
+			},
+	},
+	Terminal,
+};
+
+pub type Tui = Terminal<CrosstermBackend<Stdout>>;
+
+pub fn init() -> io::Result<Tui> {
+	execute!(stdout(), EnterAlternateScreen)?;
+	execute!(stdout(), EnableMouseCapture)?;
+	enable_raw_mode()?;
+	Terminal::new(CrosstermBackend::new(stdout()))
+}
+
+pub fn restore() -> io::Result<()> {
+	execute!(stdout(), LeaveAlternateScreen)?;
+	execute!(stdout(), DisableMouseCapture)?;
+	disable_raw_mode()?;
+	Ok(())
+}
+