18330c2362
- In the bottom line of the TUI, print the number of tokens to 3 sigfigs with an SI suffix, e.g. "1.23K". - Elsewhere where we print a number, I figure it's worthwhile to print the exact number, because e.g. it's a summary of your session. Here we print the numbers comma-separated.
99 lines
3.5 KiB
Rust
99 lines
3.5 KiB
Rust
use std::sync::OnceLock;
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use icu_decimal::DecimalFormatter;
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use icu_decimal::input::Decimal;
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use icu_decimal::options::DecimalFormatterOptions;
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use icu_locale_core::Locale;
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fn make_local_formatter() -> Option<DecimalFormatter> {
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let loc: Locale = sys_locale::get_locale()?.parse().ok()?;
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DecimalFormatter::try_new(loc.into(), DecimalFormatterOptions::default()).ok()
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}
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fn make_en_us_formatter() -> DecimalFormatter {
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#![allow(clippy::expect_used)]
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let loc: Locale = "en-US".parse().expect("en-US wasn't a valid locale");
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DecimalFormatter::try_new(loc.into(), DecimalFormatterOptions::default())
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.expect("en-US wasn't a valid locale")
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}
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fn formatter() -> &'static DecimalFormatter {
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static FORMATTER: OnceLock<DecimalFormatter> = OnceLock::new();
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FORMATTER.get_or_init(|| make_local_formatter().unwrap_or_else(make_en_us_formatter))
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}
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/// Format a u64 with locale-aware digit separators (e.g. "12345" -> "12,345"
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/// for en-US).
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pub fn format_with_separators(n: u64) -> String {
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formatter().format(&Decimal::from(n)).to_string()
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}
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fn format_si_suffix_with_formatter(n: u64, formatter: &DecimalFormatter) -> String {
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if n < 1000 {
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return formatter.format(&Decimal::from(n)).to_string();
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}
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// Format `n / scale` with the requested number of fractional digits.
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let format_scaled = |n: u64, scale: u64, frac_digits: u32| -> String {
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let value = n as f64 / scale as f64;
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let scaled: u64 = (value * 10f64.powi(frac_digits as i32)).round() as u64;
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let mut dec = Decimal::from(scaled);
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dec.multiply_pow10(-(frac_digits as i16));
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formatter.format(&dec).to_string()
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};
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const UNITS: [(u64, &str); 3] = [(1_000, "K"), (1_000_000, "M"), (1_000_000_000, "G")];
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let f = n as f64;
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for &(scale, suffix) in &UNITS {
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if (100.0 * f / scale as f64).round() < 1000.0 {
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return format!("{}{}", format_scaled(n, scale, 2), suffix);
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} else if (10.0 * f / scale as f64).round() < 1000.0 {
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return format!("{}{}", format_scaled(n, scale, 1), suffix);
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} else if (f / scale as f64).round() < 1000.0 {
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return format!("{}{}", format_scaled(n, scale, 0), suffix);
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}
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}
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// Above 1000G, keep whole‑G precision.
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format!(
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"{}G",
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format_with_separators(((n as f64) / 1e9).round() as u64)
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)
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}
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/// Format token counts to 3 significant figures, using base-10 SI suffixes.
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///
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/// Examples (en-US):
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/// - 999 -> "999"
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/// - 1200 -> "1.20K"
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/// - 123456789 -> "123M"
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pub fn format_si_suffix(n: u64) -> String {
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format_si_suffix_with_formatter(n, formatter())
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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 kmg() {
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let formatter = make_en_us_formatter();
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let fmt = |n: u64| format_si_suffix_with_formatter(n, &formatter);
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assert_eq!(fmt(0), "0");
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assert_eq!(fmt(999), "999");
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assert_eq!(fmt(1_000), "1.00K");
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assert_eq!(fmt(1_200), "1.20K");
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assert_eq!(fmt(10_000), "10.0K");
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assert_eq!(fmt(100_000), "100K");
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assert_eq!(fmt(999_500), "1.00M");
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assert_eq!(fmt(1_000_000), "1.00M");
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assert_eq!(fmt(1_234_000), "1.23M");
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assert_eq!(fmt(12_345_678), "12.3M");
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assert_eq!(fmt(999_950_000), "1.00G");
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assert_eq!(fmt(1_000_000_000), "1.00G");
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assert_eq!(fmt(1_234_000_000), "1.23G");
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// Above 1000G we keep whole‑G precision (no higher unit supported here).
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assert_eq!(fmt(1_234_000_000_000), "1,234G");
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}
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}
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