Cron lines

use cron.qweruse cron_next, cron_valid from cron      // Quillo 0.6: only these

cron = "0.12"chrono = "0.4"

// A page that shows when each job runs next.////   quillo run cron.qwe      then open http://localhost:8080/next?line=0+9+*+*+1-5use "cron.qwer"route GET /next ? { line: str } = cron_next(line, 5, 0)? | map((ms) => date.format(date.from_ms(ms), "yyyy-MM-dd HH:mm"))route GET /fixed = { runs: cron_next("30 2 * * *", 2, 1767225600000)?, valid: cron_valid("*/15 * * * *"), invalid: cron_valid("61 * * * *") }

//! Cron lines read: the next times one runs, whether it is valid, for showing a schedule or running your own.//! version: 1.0.0//!//! [dependencies]//! cron = "0.12"//! chrono = "0.4"use chrono::{TimeZone, Utc};use std::str::FromStr;/// A 5-field line (`minute hour day month weekday`) given a seconds field, as the crate wants; 6 and 7 fields pass as they are.fn schedule(line: &str) -> Result<cron::Schedule, String> {    let fields = line.split_whitespace().count();    let full = if fields == 5 { format!("0 {}", line.trim()) } else { line.trim().to_string() };    cron::Schedule::from_str(&full).map_err(|e| format!("`{}`: {}", line, e))}/// The next `count` times `line` runs after `after` (milliseconds since 1970; 0 for now), in UTC, as milliseconds.pub fn cron_next(line: &str, count: i64, after: i64) -> Result<Vec<i64>, String> {    let s = schedule(line)?;    let from = if after > 0 { Utc.timestamp_millis_opt(after).single().ok_or("a time out of range")? } else { Utc::now() };    Ok(s.after(&from).take(count.clamp(0, 1000) as usize).map(|t| t.timestamp_millis()).collect())}/// Whether `line` is a cron line this reads (5 fields, or 6 and 7 with seconds and years).pub fn cron_valid(line: &str) -> bool {    schedule(line).is_ok()}