Parse Duration with Fallbacks

Very thin wrapper over the humantime library that provides convenience methods to parse time either as a humantime compatible string or as a number, falling back to a default time unit. Comes in handy for passing a value_parser function when using Clap derive macros.

Supports the following convenience wrappers:

• parse_duration_fallback_us: falls back to Microseconds
• parse_duration_fallback_ns: falls back to Nanoseconds
• parse_duration_fallback_ms: falls back to Milliseconds
• parse_duration_fallback_sec: falls back to Seconds
• parse_duration_fallback_min: falls back to Minutes
• parse_duration_fallback_hour: falls back to Hours
• parse_duration_fallback_day: falls back to Days

Examples

• using a duration string:

  let duration_string = "42h";
  match parse_duration_fallback_sec(duration_string) {
      Ok(duration) => {
          println!("{:?}", duration);
      }
      Err(e) => {
          println!("{:?}", e)
      }
  }

• using a number:

  let seconds = "1_000_000";
  match parse_duration_fallback_sec(seconds) {
      Ok(duration) => {
          println!("{:?}", duration);
      }
      Err(e) => {
          println!("{:?}", e)
      }
  }

• in a Clap macro:

  #[clap(long = "duration-argument", default_value = "100ms", value_parser = parse_duration_fallback_ms)]
  duration_argument: Duration

  and you can now use ./cli --duration-argument 10ms or ./cli --duration-argument 10

License

Licensed under either of

• Apache License, Version 2.0, (LICENSE-APACHE or http://www.apache.org/licenses/LICENSE-2.0)
• MIT license (LICENSE-MIT or http://opensource.org/licenses/MIT)

at your option.

Contribution

Unless you explicitly state otherwise, any contribution intentionally submitted for inclusion in the work by you, as defined in the Apache-2.0 license, shall be dual licensed as above, without any additional terms or conditions.