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use crossterm::event::{read, Event, KeyCode, KeyEvent};
use crossterm::style::{Color, Print};
use crossterm::terminal::ClearType;
use crossterm::{cursor, execute, terminal};
use futures::Future;
use lazy_static::lazy_static;
use minimad::mad_inline;
use std::io::{stderr, Stderr, Write};
use termimad::{mad_write_inline, MadSkin};
use tokio::sync::{
oneshot,
oneshot::{error::TryRecvError, Sender},
};
use tokio::task::JoinHandle;
use tokio::time;
use crate::error::{Error, Result};
const LOADING_SPINNER_DELAY: u64 = 40;
const LOADING_SPINNER_DOTS: [&str; 56] = [
"⢀⠀", "⡀⠀", "⠄⠀", "⢂⠀", "⡂⠀", "⠅⠀", "⢃⠀", "⡃⠀", "⠍⠀", "⢋⠀", "⡋⠀", "⠍⠁", "⢋⠁", "⡋⠁", "⠍⠉", "⠋⠉",
"⠋⠉", "⠉⠙", "⠉⠙", "⠉⠩", "⠈⢙", "⠈⡙", "⢈⠩", "⡀⢙", "⠄⡙", "⢂⠩", "⡂⢘", "⠅⡘", "⢃⠨", "⡃⢐", "⠍⡐", "⢋⠠",
"⡋⢀", "⠍⡁", "⢋⠁", "⡋⠁", "⠍⠉", "⠋⠉", "⠋⠉", "⠉⠙", "⠉⠙", "⠉⠩", "⠈⢙", "⠈⡙", "⠈⠩", "⠀⢙", "⠀⡙", "⠀⠩",
"⠀⢘", "⠀⡘", "⠀⠨", "⠀⢐", "⠀⡐", "⠀⠠", "⠀⢀", "⠀⡀",
];
/// Blocks and waits for the user to press any key. Returns whether or not that key is the
/// character key `c`.
pub fn wait_for_char(c: char) -> Result<bool> {
let mut pressed = false;
terminal::enable_raw_mode()?;
loop {
match read()? {
Event::Key(KeyEvent {
code: KeyCode::Char(ch),
..
}) if ch == c => {
pressed = true;
break;
}
Event::Key(_) => break,
_ => (),
}
}
terminal::disable_raw_mode()?;
Ok(pressed)
}
/// As it sounds, takes a future and shows a CLI spinner until it's output is ready
pub async fn wrap_spinner<F>(future: F) -> Result<F::Output>
where
F: Future,
{
// Start spinner
let (tx, spinner_handle) = spinner();
let result = future.await;
// Stop spinner
tx.send(()).ok();
spinner_handle.await??;
Ok(result)
}
/// Start a CLI spinner on the current cursor line. To stop it, call `send` on the `Sender`. To
/// wait until it's done cleaning up it's current action (which is very important), await it's
/// `JoinHandle`.
pub fn spinner() -> (Sender<()>, JoinHandle<Result<()>>) {
let (tx, mut rx) = oneshot::channel();
let spinner_handle = tokio::spawn(async move {
let mut dots = LOADING_SPINNER_DOTS.iter().cycle();
terminal::enable_raw_mode()?;
execute!(
stderr(),
cursor::SavePosition,
cursor::Hide,
terminal::Clear(ClearType::CurrentLine),
)?;
let mut interval = time::interval(time::Duration::from_millis(LOADING_SPINNER_DELAY));
while let Err(TryRecvError::Empty) = rx.try_recv() {
execute!(
stderr(),
cursor::MoveToColumn(0),
terminal::Clear(ClearType::CurrentLine),
Print(dots.next().unwrap())
)?;
interval.tick().await;
}
execute!(
stderr(),
terminal::Clear(ClearType::CurrentLine),
cursor::RestorePosition,
cursor::Show,
)?;
terminal::disable_raw_mode()?;
Ok(())
});
(tx, spinner_handle)
}
/// Temporarily modifies a skin with error styles (e.g. red fg) for use with the given closure.
/// Once the closure finishes, the skin is returned to original state.
pub fn with_error_style<R, F>(skin: &mut MadSkin, f: F) -> Result<R>
where
F: FnOnce(&MadSkin, &mut Stderr) -> Result<R, termimad::Error>,
{
let err = &mut std::io::stderr();
let p = skin.paragraph.clone();
skin.paragraph.set_fg(Color::Red);
mad_write_inline!(err, skin, "✖ ")?;
let r: R = f(&skin, err)?;
skin.paragraph = p;
Ok::<R, Error>(r)
}
/// This makes code much more convenient, but would require each style to own
/// its own skin clone. Not sure if it is worth it.
pub fn mk_print_error(skin: &MadSkin) -> impl FnMut(&str) -> Result<()> + 'static {
let mut skin = skin.clone();
move |text: &str| {
with_error_style(&mut skin, |err_skin, stderr| {
err_skin.write_text_on(stderr, text)
})
}
}
#[macro_export]
macro_rules! print_error {
($skin: expr, $md: literal $(, $value: expr )* $(,)? ) => {{
use lazy_static::lazy_static;
use minimad::mad_inline;
use crate::error::Error;
let err = &mut std::io::stderr();
let p = $skin.paragraph.clone();
$skin.paragraph.set_fg(crossterm::style::Color::Red);
termimad::mad_write_inline!(err, $skin, "✖ ").map_err(Error::from)?;
$skin.write_composite(err, mad_inline!($md $(, $value)*)).map_err(Error::from)?;
$skin.paragraph = p;
Ok::<(), Error>(())
}};
}
#[macro_export]
macro_rules! print_notice {
($skin: expr, $md: literal $(, $value: expr )* $(,)? ) => {{
use lazy_static::lazy_static;
use minimad::mad_inline;
use crate::error::Error;
let err = &mut std::io::stderr();
let p = $skin.paragraph.clone();
$skin.paragraph.set_fg(crossterm::style::Color::Yellow);
termimad::mad_write_inline!(err, $skin, "➜ ").map_err(Error::from)?;
$skin.write_composite(err, mad_inline!($md $(, $value)*)).map_err(Error::from)?;
$skin.paragraph = p;
Ok::<(), Error>(())
}};
}
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