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https://github.com/denoland/deno.git
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97 lines
2.7 KiB
Rust
97 lines
2.7 KiB
Rust
// Copyright 2018-2022 the Deno authors. All rights reserved. MIT license.
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use deno_core::error::AnyError;
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use deno_core::serde_json;
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use std::io::Write;
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/// A function that converts a float to a string the represents a human
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/// readable version of that number.
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pub fn human_size(size: f64) -> String {
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let negative = if size.is_sign_positive() { "" } else { "-" };
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let size = size.abs();
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let units = ["B", "KB", "MB", "GB", "TB", "PB", "EB", "ZB", "YB"];
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if size < 1_f64 {
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return format!("{}{}{}", negative, size, "B");
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}
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let delimiter = 1024_f64;
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let exponent = std::cmp::min(
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(size.ln() / delimiter.ln()).floor() as i32,
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(units.len() - 1) as i32,
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);
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let pretty_bytes = format!("{:.2}", size / delimiter.powi(exponent))
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.parse::<f64>()
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.unwrap()
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* 1_f64;
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let unit = units[exponent as usize];
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format!("{}{}{}", negative, pretty_bytes, unit)
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}
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/// A function that converts a milisecond elapsed time to a string that
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/// represents a human readable version of that time.
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pub fn human_elapsed(elapsed: u128) -> String {
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if elapsed < 1_000 {
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return format!("{}ms", elapsed);
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}
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if elapsed < 1_000 * 60 {
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return format!("{}s", elapsed / 1000);
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}
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let seconds = elapsed / 1_000;
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let minutes = seconds / 60;
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let seconds_remainder = seconds % 60;
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format!("{}m{}s", minutes, seconds_remainder)
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}
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pub fn write_to_stdout_ignore_sigpipe(
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bytes: &[u8],
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) -> Result<(), std::io::Error> {
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use std::io::ErrorKind;
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match std::io::stdout().write_all(bytes) {
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Ok(()) => Ok(()),
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Err(e) => match e.kind() {
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ErrorKind::BrokenPipe => Ok(()),
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_ => Err(e),
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},
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}
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}
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pub fn write_json_to_stdout<T>(value: &T) -> Result<(), AnyError>
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where
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T: ?Sized + serde::ser::Serialize,
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{
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let mut writer = std::io::BufWriter::new(std::io::stdout());
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serde_json::to_writer_pretty(&mut writer, value)?;
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writeln!(&mut writer)?;
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Ok(())
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}
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#[cfg(test)]
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mod tests {
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use super::*;
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#[test]
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fn test_human_size() {
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assert_eq!(human_size(1_f64), "1B");
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assert_eq!(human_size((12 * 1024) as f64), "12KB");
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assert_eq!(human_size((24_i64 * 1024 * 1024) as f64), "24MB");
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assert_eq!(human_size((24_i64 * 1024 * 1024 * 1024) as f64), "24GB");
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assert_eq!(
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human_size((24_i64 * 1024 * 1024 * 1024 * 1024) as f64),
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"24TB"
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);
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assert_eq!(human_size(0_f64), "0B");
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assert_eq!(human_size(-10_f64), "-10B");
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}
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#[test]
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fn test_human_elapsed() {
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assert_eq!(human_elapsed(1), "1ms");
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assert_eq!(human_elapsed(256), "256ms");
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assert_eq!(human_elapsed(1000), "1s");
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assert_eq!(human_elapsed(1001), "1s");
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assert_eq!(human_elapsed(1020), "1s");
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assert_eq!(human_elapsed(70 * 1000), "1m10s");
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assert_eq!(human_elapsed(86 * 1000 + 100), "1m26s");
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}
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}
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