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|
use std::io::BufRead;
use std::fmt;
use ical::IcalParser;
use chrono::Duration;
use itertools::Itertools;
use date::Date;
use event::{Event, End};
use periodic::Periodic;
use errors::EventError;
pub struct Calendar {
single: Vec<Event>,
periodic: Vec<Periodic>,
}
impl Calendar {
pub fn parse<B: BufRead>(buf: B) -> Result<Self, EventError> {
let reader = IcalParser::new(buf);
let mut single = Vec::new();
let mut periodic = Vec::new();
for line in reader {
let calendar = line?;
let name = calendar
.properties
.iter()
.filter(|prop| prop.name == "X-WR-CALNAME")
.map(|prop| prop.value.clone())
.flatten()
.next();
for ev in calendar.events {
let mut event = Event::new(&name);
let mut maybe_periodic = None;
for property in ev.properties {
let value = property.value.unwrap_or("".to_string());
let mut time_zone = "".to_string();
let params = property.params.unwrap_or(vec![]);
for (param, value) in ¶ms {
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 = value.parse()?,
"DTSTART" => event.start = Date::parse(&value, &time_zone)?,
"DTEND" => event.end = End::Date(Date::parse(&value, &time_zone)?),
"DURATION" => event.end = End::Duration(duration(&value)?),
"RRULE" => maybe_periodic = Some(rrule(&value, ¶ms)?),
_ => (),
};
}
match maybe_periodic {
Some(mut p) => {
p.event = event;
periodic.push(p);
}
None => single.push(event),
}
}
}
single.sort();
Ok(Calendar { single, periodic })
}
pub fn iter<'a>(&'a self) -> impl Iterator<Item = Event> + 'a {
self.single.iter().map(Event::clone).merge(
self.periodic
.iter()
.map(|p| p.iter())
.kmerge(),
)
}
}
impl fmt::Display for Calendar {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
for event in &self.single {
writeln!(f, "{}", event)?;
}
writeln!(f, "")?;
for periodic in &self.periodic {
writeln!(f, "{}", periodic)?;
}
Ok(())
}
}
fn rrule(value: &str, params: &Vec<(String, Vec<String>)>) -> Result<Periodic, EventError> {
let mut periodic = Periodic::new();
for entry in value.split(";") {
let p: Vec<&str> = entry.splitn(2, "=").collect();
periodic.set_param(p[0], p[1])?;
}
for (param, values) in params {
let mut value = "";
if values.len() > 0 {
value = &values[0];
}
periodic.set_param(param, value)?;
}
Ok(periodic)
}
fn duration(value: &str) -> Result<Duration, EventError> {
let mut duration = Duration::seconds(0);
let mut acc = "".to_string();
for c in value.chars() {
match c {
'0'..='9' => acc.push(c),
'-' => duration = -duration,
'W' | 'H' | 'M' | 'S' | 'D' => {
let count = acc.parse()?;
acc = "".to_string();
let d = match c {
'W' => Duration::weeks(count),
'H' => Duration::hours(count),
'M' => Duration::minutes(count),
'S' => Duration::seconds(count),
'D' => Duration::days(count),
_ => Duration::seconds(0),
};
duration = duration + d;
}
_ => (),
}
}
Ok(duration)
}
|
