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use anyhow::Result;
use crossterm::{cursor, queue, style, terminal};
use std::{
io::{stdout, Stdout, Write},
sync::mpsc,
thread,
time::Duration,
};
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 step(&mut self, writer: &mut Stdout) -> Result<()> {
if self.stopped {
return Ok(());
}
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), style::Print(line),)?;
if self.index == 0 {
queue!(writer, cursor::Hide)?;
}
writer.flush()?;
self.index += 1;
Ok(())
}
pub fn stop(&mut self, writer: &mut Stdout) -> Result<()> {
if self.stopped {
return Ok(());
}
self.stopped = true;
queue!(
writer,
cursor::MoveToColumn(0),
terminal::Clear(terminal::ClearType::FromCursorDown),
cursor::Show
)?;
writer.flush()?;
Ok(())
}
}
pub fn run_spinner(message: &str, rx: mpsc::Receiver<()>) -> Result<()> {
let mut writer = stdout();
let mut spinner = Spinner::new(message);
loop {
spinner.step(&mut writer)?;
if let Ok(()) = rx.try_recv() {
spinner.stop(&mut writer)?;
break;
}
thread::sleep(Duration::from_millis(50))
}
spinner.stop(&mut writer)?;
Ok(())
}
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