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use std::{fmt, fmt::Debug, hash::Hasher};
pub use human_format::{Formatter, Scales};
use crate::{progress::Step, unit::DisplayValue};
/// A helper for formatting numbers in a format easily read by humans in renderers, as in `2.54 million objects`
#[derive(Debug)]
pub struct Human {
/// The name of the represented unit, like 'items' or 'objects'.
pub name: &'static str,
/// The formatter to format the actual numbers.
pub formatter: Formatter,
}
impl Human {
/// A convenience method to create a new new instance and its `formatter` and `name` fields.
pub fn new(formatter: Formatter, name: &'static str) -> Self {
Human { name, formatter }
}
fn format_bytes(&self, w: &mut dyn fmt::Write, value: Step) -> fmt::Result {
let string = self.formatter.format(value as f64);
for token in string.split(' ') {
w.write_str(token)?;
}
Ok(())
}
}
impl DisplayValue for Human {
fn display_current_value(&self, w: &mut dyn fmt::Write, value: Step, _upper: Option<Step>) -> fmt::Result {
self.format_bytes(w, value)
}
fn display_upper_bound(&self, w: &mut dyn fmt::Write, upper_bound: Step, _value: Step) -> fmt::Result {
self.format_bytes(w, upper_bound)
}
fn dyn_hash(&self, state: &mut dyn Hasher) {
state.write(self.name.as_bytes());
state.write_u8(0);
}
fn display_unit(&self, w: &mut dyn fmt::Write, _value: Step) -> fmt::Result {
w.write_str(self.name)
}
}
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