Vendor dependencies

Let's see how I like this workflow.

vendor/tui/examples/sparkline.rs

@@ -0,0 +1,176 @@
+use crossterm::{
+    event::{self, DisableMouseCapture, EnableMouseCapture, Event, KeyCode},
+    execute,
+    terminal::{disable_raw_mode, enable_raw_mode, EnterAlternateScreen, LeaveAlternateScreen},
+};
+use rand::{
+    distributions::{Distribution, Uniform},
+    rngs::ThreadRng,
+};
+use std::{
+    error::Error,
+    io,
+    time::{Duration, Instant},
+};
+use tui::{
+    backend::{Backend, CrosstermBackend},
+    layout::{Constraint, Direction, Layout},
+    style::{Color, Style},
+    widgets::{Block, Borders, Sparkline},
+    Frame, Terminal,
+};
+
+#[derive(Clone)]
+pub struct RandomSignal {
+    distribution: Uniform<u64>,
+    rng: ThreadRng,
+}
+
+impl RandomSignal {
+    pub fn new(lower: u64, upper: u64) -> RandomSignal {
+        RandomSignal {
+            distribution: Uniform::new(lower, upper),
+            rng: rand::thread_rng(),
+        }
+    }
+}
+
+impl Iterator for RandomSignal {
+    type Item = u64;
+    fn next(&mut self) -> Option<u64> {
+        Some(self.distribution.sample(&mut self.rng))
+    }
+}
+
+struct App {
+    signal: RandomSignal,
+    data1: Vec<u64>,
+    data2: Vec<u64>,
+    data3: Vec<u64>,
+}
+
+impl App {
+    fn new() -> App {
+        let mut signal = RandomSignal::new(0, 100);
+        let data1 = signal.by_ref().take(200).collect::<Vec<u64>>();
+        let data2 = signal.by_ref().take(200).collect::<Vec<u64>>();
+        let data3 = signal.by_ref().take(200).collect::<Vec<u64>>();
+        App {
+            signal,
+            data1,
+            data2,
+            data3,
+        }
+    }
+
+    fn on_tick(&mut self) {
+        let value = self.signal.next().unwrap();
+        self.data1.pop();
+        self.data1.insert(0, value);
+        let value = self.signal.next().unwrap();
+        self.data2.pop();
+        self.data2.insert(0, value);
+        let value = self.signal.next().unwrap();
+        self.data3.pop();
+        self.data3.insert(0, value);
+    }
+}
+
+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 chunks = Layout::default()
+        .direction(Direction::Vertical)
+        .margin(2)
+        .constraints(
+            [
+                Constraint::Length(3),
+                Constraint::Length(3),
+                Constraint::Length(7),
+                Constraint::Min(0),
+            ]
+            .as_ref(),
+        )
+        .split(f.size());
+    let sparkline = Sparkline::default()
+        .block(
+            Block::default()
+                .title("Data1")
+                .borders(Borders::LEFT | Borders::RIGHT),
+        )
+        .data(&app.data1)
+        .style(Style::default().fg(Color::Yellow));
+    f.render_widget(sparkline, chunks[0]);
+    let sparkline = Sparkline::default()
+        .block(
+            Block::default()
+                .title("Data2")
+                .borders(Borders::LEFT | Borders::RIGHT),
+        )
+        .data(&app.data2)
+        .style(Style::default().bg(Color::Green));
+    f.render_widget(sparkline, chunks[1]);
+    // Multiline
+    let sparkline = Sparkline::default()
+        .block(
+            Block::default()
+                .title("Data3")
+                .borders(Borders::LEFT | Borders::RIGHT),
+        )
+        .data(&app.data3)
+        .style(Style::default().fg(Color::Red));
+    f.render_widget(sparkline, chunks[2]);
+}