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|
use anyhow::Result;
use crossterm::{cursor, queue, style, terminal};
use is_terminal::IsTerminal;
use std::{
io::{stdout, Write},
time::Duration,
};
use tokio::{
sync::{mpsc, oneshot},
time::interval,
};
pub struct Spinner {
index: usize,
message: String,
stopped: bool,
}
impl Spinner {
const DATA: [&'static str; 10] = ["⠋", "⠙", "⠹", "⠸", "⠼", "⠴", "⠦", "⠧", "⠇", "⠏"];
pub fn new(message: &str) -> Self {
Spinner {
index: 0,
message: message.to_string(),
stopped: false,
}
}
pub fn set_message(&mut self, message: &str) {
self.message = format!(" {message}");
}
pub fn step(&mut self) -> Result<()> {
if self.stopped {
return Ok(());
}
let mut writer = stdout();
let frame = Self::DATA[self.index % Self::DATA.len()];
let dots = ".".repeat((self.index / 5) % 4);
let line = format!("{frame}{}{:<3}", self.message, dots);
queue!(
writer,
cursor::MoveToColumn(0),
terminal::Clear(terminal::ClearType::FromCursorDown),
style::Print(line),
)?;
if self.index == 0 {
queue!(writer, cursor::Hide)?;
}
writer.flush()?;
self.index += 1;
Ok(())
}
pub fn stop(&mut self) -> Result<()> {
if self.stopped {
return Ok(());
}
let mut writer = stdout();
self.stopped = true;
queue!(
writer,
cursor::MoveToColumn(0),
terminal::Clear(terminal::ClearType::FromCursorDown),
cursor::Show
)?;
writer.flush()?;
Ok(())
}
}
pub async fn run_spinner(message: &str) -> (oneshot::Sender<()>, mpsc::UnboundedSender<String>) {
let message = format!(" {message}");
let (stop_tx, stop_rx) = oneshot::channel();
let (message_tx, message_rx) = mpsc::unbounded_channel();
tokio::spawn(run_spinner_inner(message, stop_rx, message_rx));
(stop_tx, message_tx)
}
async fn run_spinner_inner(
message: String,
stop_rx: oneshot::Receiver<()>,
mut message_rx: mpsc::UnboundedReceiver<String>,
) -> Result<()> {
let is_stdout_terminal = stdout().is_terminal();
let mut spinner = Spinner::new(&message);
let mut interval = interval(Duration::from_millis(50));
tokio::select! {
_ = async {
loop {
tokio::select! {
_ = interval.tick() => {
if is_stdout_terminal {
let _ = spinner.step();
}
}
message = message_rx.recv() => {
if let Some(message) = message {
spinner.set_message(&message);
}
}
}
}
} => {}
_ = stop_rx => {
if is_stdout_terminal {
spinner.stop()?;
}
}
}
Ok(())
}
|
