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// Copyright 2018-2022 the Deno authors. All rights reserved. MIT license.
/// A function that converts a float to a string the represents a human
/// readable version of that number.
pub fn human_size(size: f64) -> String {
let negative = if size.is_sign_positive() { "" } else { "-" };
let size = size.abs();
let units = ["B", "KB", "MB", "GB", "TB", "PB", "EB", "ZB", "YB"];
if size < 1_f64 {
return format!("{}{}{}", negative, size, "B");
}
let delimiter = 1024_f64;
let exponent = std::cmp::min(
(size.ln() / delimiter.ln()).floor() as i32,
(units.len() - 1) as i32,
);
let pretty_bytes = format!("{:.2}", size / delimiter.powi(exponent))
.parse::<f64>()
.unwrap()
* 1_f64;
let unit = units[exponent as usize];
format!("{}{}{}", negative, pretty_bytes, unit)
}
/// A function that converts a milisecond elapsed time to a string that
/// represents a human readable version of that time.
pub fn human_elapsed(elapsed: u128) -> String {
if elapsed < 1_000 {
return format!("{}ms", elapsed);
}
if elapsed < 1_000 * 60 {
return format!("{}s", elapsed / 1000);
}
let seconds = elapsed / 1_000;
let minutes = seconds / 60;
let seconds_remainder = seconds % 60;
format!("{}m{}s", minutes, seconds_remainder)
}
#[cfg(test)]
mod tests {
use super::*;
#[test]
fn test_human_size() {
assert_eq!(human_size(1_f64), "1B");
assert_eq!(human_size((12 * 1024) as f64), "12KB");
assert_eq!(human_size((24_i64 * 1024 * 1024) as f64), "24MB");
assert_eq!(human_size((24_i64 * 1024 * 1024 * 1024) as f64), "24GB");
assert_eq!(
human_size((24_i64 * 1024 * 1024 * 1024 * 1024) as f64),
"24TB"
);
}
#[test]
fn test_human_elapsed() {
assert_eq!(human_elapsed(1), "1ms");
assert_eq!(human_elapsed(256), "256ms");
assert_eq!(human_elapsed(1000), "1s");
assert_eq!(human_elapsed(1001), "1s");
assert_eq!(human_elapsed(1020), "1s");
assert_eq!(human_elapsed(70 * 1000), "1m10s");
assert_eq!(human_elapsed(86 * 1000 + 100), "1m26s");
}
}
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