From 6263be67208f68a8c8ce1a8a18fc9921df53048e Mon Sep 17 00:00:00 2001
From: Ruben Pollan
Date: Tue, 28 Aug 2018 16:48:59 +0200
Subject: Get a range of dates

---
 src/calendar.rs | 131 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 131 insertions(+)
 create mode 100644 src/calendar.rs

(limited to 'src/calendar.rs')

diff --git a/src/calendar.rs b/src/calendar.rs
new file mode 100644
index 0000000..c49e747
--- /dev/null
+++ b/src/calendar.rs
@@ -0,0 +1,131 @@
+use std::io::BufRead;
+use std::fmt;
+use ical::IcalParser;
+use chrono::Duration;
+
+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 {
+            for ev in line?.events {
+                let mut event = Event::new();
+                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 &params {
+                        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, &params)?),
+                        _ => (),
+                    };
+                }
+                match maybe_periodic {
+                    Some(mut p) => {
+                        p.event = event;
+                        periodic.push(p);
+                    }
+                    None => single.push(event),
+                }
+            }
+        }
+
+        single.sort_by_key(|k| k.start);
+        Ok(Calendar { single, periodic })
+    }
+
+    pub fn get(&self, first: &Date, last: &Date) -> Vec<Event> {
+        // TODO: not all single, just the one by date
+        let mut events = self.single.clone();
+        for p in &self.periodic {
+            events.append(&mut p.get(first, last));
+        }
+        events.sort_by_key(|k| k.start);
+        events
+    }
+}
+
+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::weeks(1))
+}
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