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// output.rs
// Copyright (C) 2020 The Nitrocli Developers
// SPDX-License-Identifier: GPL-3.0-or-later
use anyhow::Context as _;
use progressing::Baring as _;
use termion::cursor::DetectCursorPos as _;
use termion::raw::IntoRawMode as _;
use crate::Context;
/// A progress bar that can be printed to an interactive output.
pub struct ProgressBar {
/// Whether to redraw the entire progress bar in the next call to `draw`.
redraw: bool,
/// The current progress of the progress bar (0 <= progress <= 100).
progress: u8,
/// Toggled on every call to `draw` to print a pulsing indicator.
toggle: bool,
/// Whether this progress bar finished.
finished: bool,
}
impl ProgressBar {
/// Creates a new empty progress bar.
pub fn new() -> ProgressBar {
ProgressBar {
redraw: true,
progress: 0,
toggle: false,
finished: false,
}
}
/// Whether this progress bar is finished.
pub fn is_finished(&self) -> bool {
self.finished
}
/// Updates the progress bar with the given progress (0 <= progress <= 100).
pub fn update(&mut self, progress: u8) -> anyhow::Result<()> {
anyhow::ensure!(!self.finished, "Tried to update finished progress bar");
anyhow::ensure!(
progress <= 100,
"Progress bar value out of range: {}",
progress
);
if progress != self.progress {
self.redraw = true;
self.progress = progress;
}
self.toggle = !self.toggle;
Ok(())
}
/// Finish this progress bar.
///
/// A finished progress bar may no longer be updated.
pub fn finish(&mut self) {
self.finished = true;
self.redraw = true;
self.progress = 100;
}
/// Print the progress bar to the stdout set in the given context.
///
/// On every call of this method (as long as the progress bar is not
/// finished), a pulsing indicator is printed to show that the process
/// is still running. If there was progress since the last call to
/// `draw`, or if this is the first call, this function will also
/// print the progress bar itself.
pub fn draw(&self, ctx: &mut Context<'_>) -> anyhow::Result<()> {
if !ctx.is_tty {
return Ok(());
}
let pos = ctx
.stdout
.into_raw_mode()
.context("Failed to activate raw mode")?
.cursor_pos()
.context("Failed to query cursor position")?;
let progress_char = if self.toggle && !self.finished {
"."
} else {
" "
};
if self.redraw {
let mut progress_bar = progressing::mapping::Bar::with_range(0, 100);
progress_bar.set(self.progress);
print!(ctx, "{}", termion::clear::CurrentLine)?;
print!(ctx, "{}", termion::cursor::Goto(1, pos.1))?;
print!(ctx, " {} {}", progress_char, progress_bar)?;
if self.finished {
println!(ctx)?;
}
} else {
print!(ctx, "{}{}", termion::cursor::Goto(2, pos.1), progress_char)?;
}
ctx.stdout.flush()?;
Ok(())
}
}
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