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#![cfg_attr(feature="clippy", feature(plugin))]
#![cfg_attr(feature="clippy", plugin(clippy))]
use std::io::Write;
use std::f32;
use std::time::{Duration, Instant};
#[derive(Debug)]
pub struct Progress<I> {
iter: I,
count: usize,
total: usize,
start_instant: Instant,
last_instant: Instant,
min_interval: Duration,
}
impl<I: Iterator> Iterator for Progress<I> {
type Item = I::Item;
fn next(&mut self) -> Option<Self::Item> {
if self.last_instant.elapsed() > self.min_interval {
print_meter(15, self.count, self.total, self.start_instant.elapsed());
self.last_instant = Instant::now();
}
self.count += 1;
let next = self.iter.next();
match next {
Some(_) => next,
None => {
print_meter(15, self.count - 1, self.total, self.start_instant.elapsed());
println!("");
None
}
}
}
fn size_hint(&self) -> (usize, Option<usize>) {
self.iter.size_hint()
}
}
pub fn progress<I: Iterator>(input: I) -> Progress<I> {
let size = input.size_hint();
Progress {
iter: input,
count: 0,
total: size.0,
start_instant: Instant::now(),
last_instant: Instant::now(),
min_interval: Duration::from_millis(150),
}
}
fn print_meter(length: u8, count: usize, total: usize, passed: Duration) {
let ratio = count as f32 / total as f32;
let filled_length = f32::round(ratio * length as f32) as u8;
std::io::stdout().flush().unwrap();
print!("\r[");
for i in 0u8..length {
if i < filled_length {
print!("#");
} else {
print!("-");
}
}
print!("] {0:5.1}% {1}/{2} ", ratio * 100.0, count, total);
let passed_time = duration_to_f64(passed);
let iters_per_sec = count as f64 / passed_time;
let left_time = (total - count) as f64 / iters_per_sec;
print!("[elapsed: {:.1}s, left: {:.1}s, {:.2} iter/s]",
passed_time,
left_time,
iters_per_sec);
}
fn duration_to_f64(d: Duration) -> f64 {
d.as_secs() as f64 + d.subsec_nanos() as f64 * 1e-9_f64
}