Vendor dependencies

Let's see how I like this workflow.

vendor/tui/examples/tabs.rs

@@ -0,0 +1,124 @@
+use crossterm::{
+    event::{self, DisableMouseCapture, EnableMouseCapture, Event, KeyCode},
+    execute,
+    terminal::{disable_raw_mode, enable_raw_mode, EnterAlternateScreen, LeaveAlternateScreen},
+};
+use std::{error::Error, io};
+use tui::{
+    backend::{Backend, CrosstermBackend},
+    layout::{Constraint, Direction, Layout},
+    style::{Color, Modifier, Style},
+    text::{Span, Spans},
+    widgets::{Block, Borders, Tabs},
+    Frame, Terminal,
+};
+
+struct App<'a> {
+    pub titles: Vec<&'a str>,
+    pub index: usize,
+}
+
+impl<'a> App<'a> {
+    fn new() -> App<'a> {
+        App {
+            titles: vec!["Tab0", "Tab1", "Tab2", "Tab3"],
+            index: 0,
+        }
+    }
+
+    pub fn next(&mut self) {
+        self.index = (self.index + 1) % self.titles.len();
+    }
+
+    pub fn previous(&mut self) {
+        if self.index > 0 {
+            self.index -= 1;
+        } else {
+            self.index = self.titles.len() - 1;
+        }
+    }
+}
+
+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 app = App::new();
+    let res = run_app(&mut terminal, app);
+
+    // 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) -> io::Result<()> {
+    loop {
+        terminal.draw(|f| ui(f, &app))?;
+
+        if let Event::Key(key) = event::read()? {
+            match key.code {
+                KeyCode::Char('q') => return Ok(()),
+                KeyCode::Right => app.next(),
+                KeyCode::Left => app.previous(),
+                _ => {}
+            }
+        }
+    }
+}
+
+fn ui<B: Backend>(f: &mut Frame<B>, app: &App) {
+    let size = f.size();
+    let chunks = Layout::default()
+        .direction(Direction::Vertical)
+        .margin(5)
+        .constraints([Constraint::Length(3), Constraint::Min(0)].as_ref())
+        .split(size);
+
+    let block = Block::default().style(Style::default().bg(Color::White).fg(Color::Black));
+    f.render_widget(block, size);
+    let titles = app
+        .titles
+        .iter()
+        .map(|t| {
+            let (first, rest) = t.split_at(1);
+            Spans::from(vec![
+                Span::styled(first, Style::default().fg(Color::Yellow)),
+                Span::styled(rest, Style::default().fg(Color::Green)),
+            ])
+        })
+        .collect();
+    let tabs = Tabs::new(titles)
+        .block(Block::default().borders(Borders::ALL).title("Tabs"))
+        .select(app.index)
+        .style(Style::default().fg(Color::Cyan))
+        .highlight_style(
+            Style::default()
+                .add_modifier(Modifier::BOLD)
+                .bg(Color::Black),
+        );
+    f.render_widget(tabs, chunks[0]);
+    let inner = match app.index {
+        0 => Block::default().title("Inner 0").borders(Borders::ALL),
+        1 => Block::default().title("Inner 1").borders(Borders::ALL),
+        2 => Block::default().title("Inner 2").borders(Borders::ALL),
+        3 => Block::default().title("Inner 3").borders(Borders::ALL),
+        _ => unreachable!(),
+    };
+    f.render_widget(inner, chunks[1]);
+}