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a/src/main.rs b/src/main.rs new file mode 100644 index 0000000000000000000000000000000000000000..b84d77e855283b9d3720a373a04514d6094c78fa --- /dev/null +++ b/src/main.rs @@ -0,0 +1,188 @@ +use std::env::args; +use std::str::FromStr; + +use chrono::{DateTime, Local, NaiveTime, TimeDelta, TimeZone, Utc}; +use chrono_tz::Tz; +use icalendar::{Calendar, CalendarComponent, CalendarDateTime, Component, DatePerhapsTime, EventLike}; +use walkdir::WalkDir; + +fn to_utc(dpt: DatePerhapsTime) -> Option> { + match dpt { + DatePerhapsTime::DateTime(cdt) => match cdt { + CalendarDateTime::Utc(dt) => Some(dt), + CalendarDateTime::Floating(naive) => Local + .from_local_datetime(&naive) + .earliest() + .map(|dt| dt.with_timezone(&Utc)), + CalendarDateTime::WithTimezone { date_time, tzid } => { + let tz = tzid.parse::().ok()?; + tz.from_local_datetime(&date_time) + .earliest() + .map(|dt| dt.with_timezone(&Utc)) + } + }, + DatePerhapsTime::Date(date) => { + let naive = date.and_time(NaiveTime::from_hms_opt(0, 0, 0).unwrap()); + Local + .from_local_datetime(&naive) + .earliest() + .map(|dt| dt.with_timezone(&Utc)) + } + } +} + +fn is_imminent(time_delta: TimeDelta) -> bool { + time_delta <= TimeDelta::hours(2) +} +fn is_soon(time_delta: TimeDelta) -> bool { + time_delta <= TimeDelta::hours(6) +} + +fn show_distant_event(time: DateTime, summary: &str) -> String { + format!("{} at {}", summary, time.format("%H:%M")) +} + +fn format_time_delta(td: TimeDelta) -> String { + if td.num_hours() == 0 { + format!("{}m", td.num_minutes()) + } else { + format!("{}h{}m", td.num_hours(), td.num_minutes() % 60) + } +} + +fn show_imminent(time_delta: TimeDelta, summary: &str, location: Option) -> String { + if let Some(loc) = location { + format!("{} in {} in {}", summary, format_time_delta(time_delta), loc) + } else { + format!("{} in {}", summary, format_time_delta(time_delta)) + } +} + +fn parenthesize_location(location: Option) -> String { + location.map(|u| format!("({}) ", u)).unwrap_or("".to_string()) +} + +fn is_ending_imminent(time_delta: TimeDelta) -> bool { + time_delta <= TimeDelta::minutes(30) +} +fn show_imminent_ending(time_delta: TimeDelta, summary: &str, location: Option) -> String { + format!("{} {}ending in {}", summary, parenthesize_location(location), format_time_delta(time_delta)) +} +fn show_distant_ending(end: DateTime, summary: &str, location: Option) -> String { + format!("in {} {}until {}", summary, parenthesize_location(location), end.format("%H:%M")) +} + +fn main() { + let vdir = args().nth(1).expect("usage: calstr [withloc]"); + + let with_loc = args().nth(2) == Some("withloc".to_string()); + + let now = Utc::now(); + let mut upcoming: Vec<(DateTime, DateTime, String, Option)> = Vec::new(); + + for entry in WalkDir::new(&vdir) + .follow_links(true) + .into_iter() + .filter_map(|e| e.ok()) + { + if !entry.file_name().to_string_lossy().ends_with(".ics") { + continue; + } + let content = match std::fs::read_to_string(entry.path()) { + Ok(c) => c, + Err(_) => continue, + }; + let cal = match Calendar::from_str(&content) { + Ok(c) => c, + Err(_) => continue, + }; + for component in cal.components { + if let CalendarComponent::Event(event) = component { + let Some(start) = event.get_start() else { + continue; + }; + let Some(end) = event.get_end() else { + continue; + }; + let Some(dt) = to_utc(start) else { continue }; + let Some(dte) = to_utc(end) else { continue }; + if dte > now { + let summary = event.get_summary().unwrap_or("(no title)").to_string(); + let location = event.get_location().map(|u| u.to_string()); + upcoming.push((dt, dte, summary, if with_loc { location } else { None })); + } + } + } + } + + upcoming.sort_by_key(|(dt, _, _, _)| *dt); + + // write the message + // "nothing left today" if next event is past midnight or there are no events + if upcoming.is_empty() { + println!("nothing left today"); + return; + } + let next = &upcoming[0]; + let next_local = next.0.with_timezone(&Local); + + let now = Utc::now(); + + let mut midnight = Utc::now().with_time(NaiveTime::from_hms_milli_opt(0, 0, 0, 0).unwrap()).unwrap(); + midnight += TimeDelta::days(1); + + let time_until_next = next.0 - now; + + if next.0 > midnight && !is_imminent(time_until_next) { + print!("nothing left today"); + // exception: if event is soon (<6h), include it + if is_soon(time_until_next) { + print!(", {} tomorrow", show_distant_event(next_local, &next.2)) + } + println!(); + return; + } + + // has event started? + if time_until_next < TimeDelta::zero() { + let time_until_end = next.1 - now; + let end_local = next.1.with_timezone(&Local); + // is end imminent + if is_ending_imminent(time_until_end) { + let followup = upcoming.get(1); + if let Some((following_start, _, following, following_loc)) = followup { + print!("{}", show_imminent_ending(time_until_end, &next.2, next.3.clone())); + let turnaround_time = *following_start - next.1; + + if !is_soon(turnaround_time) { + println!(); + return; + } + + if is_imminent(turnaround_time) { + println!(", then {}", show_imminent(turnaround_time, following, following_loc.clone())); + return; + } else { + println!(", then {}", show_distant_event(following_start.with_timezone(&Local), following)); + return; + } + } else { + println!("{}", show_imminent_ending(time_until_end, &next.2, next.3.clone())); + return; + } + } else { + println!("{}", show_distant_ending(end_local, &next.2, next.3.clone())); + return; + } + } + + // next event is today or imminent (or both) + // is it imminent? + if is_imminent(time_until_next) { + println!("{}", show_imminent(time_until_next, &next.2, next.3.clone())); + return; + } + + // today, show distant + println!("{}", show_distant_event(next_local, &next.2)); +}