Vendor dependencies

Let's see how I like this workflow.

vendor/tui/examples/paragraph.rs

@@ -0,0 +1,171 @@
+use crossterm::{
+    event::{self, DisableMouseCapture, EnableMouseCapture, Event, KeyCode},
+    execute,
+    terminal::{disable_raw_mode, enable_raw_mode, EnterAlternateScreen, LeaveAlternateScreen},
+};
+use std::{
+    error::Error,
+    io,
+    time::{Duration, Instant},
+};
+use tui::{
+    backend::{Backend, CrosstermBackend},
+    layout::{Alignment, Constraint, Direction, Layout},
+    style::{Color, Modifier, Style},
+    text::{Span, Spans},
+    widgets::{Block, Borders, Paragraph, Wrap},
+    Frame, Terminal,
+};
+
+struct App {
+    scroll: u16,
+}
+
+impl App {
+    fn new() -> App {
+        App { scroll: 0 }
+    }
+
+    fn on_tick(&mut self) {
+        self.scroll += 1;
+        self.scroll %= 10;
+    }
+}
+
+fn main() -> Result<(), Box<dyn Error>> {
+    // setup terminal
+    enable_raw_mode()?;
+    let mut stdout = io::stdout();
+    execute!(stdout, EnterAlternateScreen, EnableMouseCapture)?;
+    let backend = CrosstermBackend::new(stdout);
+    let mut terminal = Terminal::new(backend)?;
+
+    // create app and run it
+    let tick_rate = Duration::from_millis(250);
+    let app = App::new();
+    let res = run_app(&mut terminal, app, tick_rate);
+
+    // restore terminal
+    disable_raw_mode()?;
+    execute!(
+        terminal.backend_mut(),
+        LeaveAlternateScreen,
+        DisableMouseCapture
+    )?;
+    terminal.show_cursor()?;
+
+    if let Err(err) = res {
+        println!("{:?}", err)
+    }
+
+    Ok(())
+}
+
+fn run_app<B: Backend>(
+    terminal: &mut Terminal<B>,
+    mut app: App,
+    tick_rate: Duration,
+) -> io::Result<()> {
+    let mut last_tick = Instant::now();
+    loop {
+        terminal.draw(|f| ui(f, &app))?;
+
+        let timeout = tick_rate
+            .checked_sub(last_tick.elapsed())
+            .unwrap_or_else(|| Duration::from_secs(0));
+        if crossterm::event::poll(timeout)? {
+            if let Event::Key(key) = event::read()? {
+                if let KeyCode::Char('q') = key.code {
+                    return Ok(());
+                }
+            }
+        }
+        if last_tick.elapsed() >= tick_rate {
+            app.on_tick();
+            last_tick = Instant::now();
+        }
+    }
+}
+
+fn ui<B: Backend>(f: &mut Frame<B>, app: &App) {
+    let size = f.size();
+
+    // Words made "loooong" to demonstrate line breaking.
+    let s = "Veeeeeeeeeeeeeeeery    loooooooooooooooooong   striiiiiiiiiiiiiiiiiiiiiiiiiing.   ";
+    let mut long_line = s.repeat(usize::from(size.width) / s.len() + 4);
+    long_line.push('\n');
+
+    let block = Block::default().style(Style::default().bg(Color::White).fg(Color::Black));
+    f.render_widget(block, size);
+
+    let chunks = Layout::default()
+        .direction(Direction::Vertical)
+        .margin(5)
+        .constraints(
+            [
+                Constraint::Percentage(25),
+                Constraint::Percentage(25),
+                Constraint::Percentage(25),
+                Constraint::Percentage(25),
+            ]
+            .as_ref(),
+        )
+        .split(size);
+
+    let text = vec![
+        Spans::from("This is a line "),
+        Spans::from(Span::styled(
+            "This is a line   ",
+            Style::default().fg(Color::Red),
+        )),
+        Spans::from(Span::styled(
+            "This is a line",
+            Style::default().bg(Color::Blue),
+        )),
+        Spans::from(Span::styled(
+            "This is a longer line",
+            Style::default().add_modifier(Modifier::CROSSED_OUT),
+        )),
+        Spans::from(Span::styled(&long_line, Style::default().bg(Color::Green))),
+        Spans::from(Span::styled(
+            "This is a line",
+            Style::default()
+                .fg(Color::Green)
+                .add_modifier(Modifier::ITALIC),
+        )),
+    ];
+
+    let create_block = |title| {
+        Block::default()
+            .borders(Borders::ALL)
+            .style(Style::default().bg(Color::White).fg(Color::Black))
+            .title(Span::styled(
+                title,
+                Style::default().add_modifier(Modifier::BOLD),
+            ))
+    };
+    let paragraph = Paragraph::new(text.clone())
+        .style(Style::default().bg(Color::White).fg(Color::Black))
+        .block(create_block("Left, no wrap"))
+        .alignment(Alignment::Left);
+    f.render_widget(paragraph, chunks[0]);
+    let paragraph = Paragraph::new(text.clone())
+        .style(Style::default().bg(Color::White).fg(Color::Black))
+        .block(create_block("Left, wrap"))
+        .alignment(Alignment::Left)
+        .wrap(Wrap { trim: true });
+    f.render_widget(paragraph, chunks[1]);
+    let paragraph = Paragraph::new(text.clone())
+        .style(Style::default().bg(Color::White).fg(Color::Black))
+        .block(create_block("Center, wrap"))
+        .alignment(Alignment::Center)
+        .wrap(Wrap { trim: true })
+        .scroll((app.scroll, 0));
+    f.render_widget(paragraph, chunks[2]);
+    let paragraph = Paragraph::new(text)
+        .style(Style::default().bg(Color::White).fg(Color::Black))
+        .block(create_block("Right, wrap"))
+        .alignment(Alignment::Right)
+        .wrap(Wrap { trim: true });
+    f.render_widget(paragraph, chunks[3]);
+}