Jean
993f5b2eea
Rebrand the daemon and workspace: the binary is now `echo`, every crate is `echo-*` (`echo-api` and the module crates), Rust imports use `echo_*`, the gRPC proto is `proto/echo.proto` with package `echo.v1`, and the log filter, gossip peer-name default, and on-disk store default (`echo.db.jsonl`) follow. Docs updated throughout. No behaviour change; crate directories and the config schema are untouched.
70 lines
2.6 KiB
Rust
70 lines
2.6 KiB
Rust
use echo_api::{Sender, ServiceCtx};
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use super::expr;
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// `N~expr` may repeat a roll at most this many times.
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const MAX_REPEATS: u32 = 25;
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// ROLL/EXROLL/CALC/EXCALC <expr>: evaluate a dice/math expression and reply.
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// `round_result` gives a whole number (ROLL); `extended` also shows each die.
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pub fn handle(me: &str, from: &Sender, rest: &[&str], ctx: &mut ServiceCtx, extended: bool, round_result: bool) {
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let input = rest.join(" ");
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let input = input.trim();
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if input.is_empty() {
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ctx.notice(me, from.uid, "Give me something to roll, e.g. \x022d6+3\x02.");
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return;
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}
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// `N~expr` repeats the roll N times.
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let (times, body) = match input.split_once('~') {
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Some((n, body)) => match n.trim().parse::<u32>() {
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Ok(t) if (1..=MAX_REPEATS).contains(&t) => (t, body.trim()),
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_ => {
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ctx.notice(me, from.uid, format!("The repeat count before \x02~\x02 must be a number from 1 to {MAX_REPEATS}."));
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return;
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}
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},
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None => (1, input),
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};
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let mut rng = rand::thread_rng();
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for i in 0..times {
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match expr::evaluate(body, &mut rng) {
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Ok(ev) => {
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let result = format_value(ev.value, round_result);
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let prefix = if times > 1 { format!("[{}/{}] ", i + 1, times) } else { String::new() };
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let detail = if extended && !ev.rolls.is_empty() {
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format!(" — {}", ev.rolls.iter().map(render_roll).collect::<Vec<_>>().join(", "))
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} else {
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String::new()
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};
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ctx.notice(me, from.uid, format!("{prefix}\x02{body}\x02 = \x02{result}\x02{detail}"));
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}
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Err(why) => {
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ctx.notice(me, from.uid, format!("I couldn't roll \x02{body}\x02: {why}."));
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return; // the whole batch shares the expression, so it'll fail the same way
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}
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}
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}
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}
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// "2d6: 4+5=9" for the extended output.
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fn render_roll(r: &expr::Roll) -> String {
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if r.values.len() == 1 {
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format!("{}: {}", r.spec, r.total)
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} else {
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let each = r.values.iter().map(u64::to_string).collect::<Vec<_>>().join("+");
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format!("{}: {}={}", r.spec, each, r.total)
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}
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}
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// ROLL rounds to a whole number; CALC keeps up to four decimals, trimmed.
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fn format_value(v: f64, round_result: bool) -> String {
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if round_result {
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return format!("{}", v.round() as i64);
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}
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if v.fract() == 0.0 && v.abs() < 1e15 {
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return format!("{}", v as i64);
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}
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let s = format!("{v:.4}");
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s.trim_end_matches('0').trim_end_matches('.').to_string()
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}
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