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use std::io;
use std::io::BufReader;
use std::fs::File;
use std::path::Path;
use std::str::FromStr;
use std::num::ParseIntError;
use std::fmt;
use std::cmp::Ordering;
use ical::parser;
use ical::IcalParser;
use chrono;
use chrono_tz::{Tz, UTC};
use chrono::prelude::{DateTime, TimeZone};
#[derive(Debug)]
pub enum Date {
Time(DateTime<Tz>),
AllDay(chrono::Date<Tz>),
}
#[derive(Debug)]
pub enum Status {
Confirmed,
Tentative,
Canceled,
}
#[derive(Debug)]
pub struct Event {
pub start: Date,
pub end: Date,
pub summary: String,
pub location: String,
pub description: String,
pub status: Status,
}
pub fn parse<P: AsRef<Path>>(ics: P) -> Result<Vec<Event>, IcsError> {
let buf = BufReader::new(File::open(ics)?);
let reader = IcalParser::new(buf);
let mut events = Vec::new();
for line in reader {
for ev in line?.events {
let mut event = Event::new();
for property in ev.properties {
let value = property.value.unwrap_or("".to_string());
let mut time_zone = "".to_string();
for (param, value) in property.params.unwrap_or(vec![]) {
if param == "TZID" && value.len() > 0 {
time_zone = value[0].clone();
}
}
match property.name.as_ref() {
"SUMMARY" => event.summary = value,
"LOCATION" => event.location = value,
"DESCRIPTION" => event.description = value,
"STATUS" => event.status = Status::from_str(&value)?,
"DTSTART" => event.start = parse_date(value, time_zone)?,
"DTEND" => event.end = parse_date(value, time_zone)?,
_ => (),
};
}
events.push(event);
}
}
events.sort_by(|a, b| a.start.cmp(&b.start));
Ok(events)
}
fn parse_date(date: String, time_zone: String) -> Result<Date, IcsError> {
let tz: Tz = time_zone.parse().unwrap_or(UTC);
let date = match date.find("T") {
Some(_) => {
let time = tz.datetime_from_str(&date, "%Y%m%dT%H%M%S").unwrap_or(
UTC.timestamp(
0,
0,
),
);
Date::Time(time)
}
None => {
Date::AllDay(tz.ymd(
i32::from_str(&date[0..4])?,
u32::from_str(&date[4..6])?,
u32::from_str(&date[6..8])?,
))
}
};
Ok(date)
}
impl Event {
fn new() -> Event {
return Event {
summary: "".to_string(),
location: "".to_string(),
description: "".to_string(),
status: Status::Confirmed,
start: Date::Time(UTC.timestamp(0, 0)),
end: Date::Time(UTC.timestamp(0, 0)),
};
}
}
impl fmt::Display for Event {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
write!(f, "{:?}: {}", self.start, self.summary)?;
if !self.location.is_empty() {
write!(f, " ({})", self.location)?;
}
if !self.description.is_empty() {
write!(f, "\n\t{}", self.description)?;
}
Ok(())
}
}
impl Date {
fn cmp(&self, other: &Date) -> Ordering {
match *self {
Date::Time(t1) => {
match *other {
Date::Time(t2) => t1.cmp(&t2),
Date::AllDay(d) => cmp_date_time(&d, &t1).reverse(),
}
}
Date::AllDay(d1) => {
match *other {
Date::Time(t) => cmp_date_time(&d1, &t),
Date::AllDay(d2) => d1.cmp(&d2),
}
}
}
}
}
impl FromStr for Status {
type Err = IcsError;
fn from_str(s: &str) -> Result<Self, Self::Err> {
match s {
"CONFIRMED" => Ok(Status::Confirmed),
"TENTATIVE" => Ok(Status::Tentative),
"CANCELED" => Ok(Status::Canceled),
_ => Err(IcsError::StatusError),
}
}
}
fn cmp_date_time<T: TimeZone>(date: &chrono::Date<T>, time: &DateTime<T>) -> Ordering {
let d2 = time.date();
if date.eq(&d2) {
return Ordering::Less;
}
date.cmp(&d2)
}
#[derive(Debug)]
pub enum IcsError {
IoError(io::Error),
IcalError(parser::errors::Error),
IntError(ParseIntError),
StatusError,
}
impl From<io::Error> for IcsError {
fn from(err: io::Error) -> IcsError {
IcsError::IoError(err)
}
}
impl From<parser::errors::Error> for IcsError {
fn from(err: parser::errors::Error) -> IcsError {
IcsError::IcalError(err)
}
}
impl From<ParseIntError> for IcsError {
fn from(err: ParseIntError) -> IcsError {
IcsError::IntError(err)
}
}
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