From b80fb44d83f9460f9d1ab4c831e7c6a9baf44c16 Mon Sep 17 00:00:00 2001
From: Ruben Pollan
Date: Sat, 25 Aug 2018 19:09:30 +0200
Subject: Basic periodic events support

---
 src/errors.rs   |  1 +
 src/events.rs   | 40 +++++++++++++++++++++++++++++++++---
 src/main.rs     |  1 +
 src/periodic.rs | 64 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 4 files changed, 103 insertions(+), 3 deletions(-)
 create mode 100644 src/periodic.rs

diff --git a/src/errors.rs b/src/errors.rs
index d526bae..be78bcf 100644
--- a/src/errors.rs
+++ b/src/errors.rs
@@ -6,6 +6,7 @@ pub enum EventError {
     IcalError(parser::errors::Error),
     IntError(ParseIntError),
     StatusError,
+    FreqError,
 }
 
 impl From<parser::errors::Error> for EventError {
diff --git a/src/events.rs b/src/events.rs
index a78a286..9cda846 100644
--- a/src/events.rs
+++ b/src/events.rs
@@ -3,25 +3,31 @@ use std::fmt;
 use ical::IcalParser;
 
 use event::{Event, Date};
+use periodic::Periodic;
 use errors::EventError;
 
 pub struct Events {
     single: Vec<Event>,
+    periodic: Vec<Periodic>,
 }
 
 impl Events {
     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();
 
-                    for (param, value) in property.params.unwrap_or(vec![]) {
+                    let params = property.params.unwrap_or(vec![]);
+                    for (param, value) in &params {
                         if param == "TZID" && value.len() > 0 {
                             time_zone = value[0].clone();
                         }
@@ -34,15 +40,22 @@ impl Events {
                         "STATUS" => event.status = value.parse()?,
                         "DTSTART" => event.start = Date::parse(&value, &time_zone)?,
                         "DTEND" => event.end = Date::parse(&value, &time_zone)?,
+                        "RRULE" => maybe_periodic = Some(rrule(&value, &params)?),
                         _ => (),
                     };
                 }
-                single.push(event);
+                match maybe_periodic {
+                    Some(mut p) => {
+                        p.event = event;
+                        periodic.push(p);
+                    }
+                    None => single.push(event),
+                }
             }
         }
 
         single.sort_by(|a, b| a.start.cmp(&b.start));
-        Ok(Events { single })
+        Ok(Events { single, periodic })
     }
 }
 
@@ -51,6 +64,27 @@ impl fmt::Display for Events {
         for event in &self.single {
             writeln!(f, "{}", event)?;
         }
+        writeln!(f, "")?;
+        for periodic in &self.periodic {
+            writeln!(f, "{}", periodic)?;
+        }
         Ok(())
     }
 }
+
+fn rrule(value: &String, params: &Vec<(String, Vec<String>)>) -> Result<Periodic, EventError> {
+    let mut periodic = Periodic::new();
+
+    let p: Vec<&str> = value.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)
+}
diff --git a/src/main.rs b/src/main.rs
index c923232..6b011bd 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -3,6 +3,7 @@ extern crate chrono;
 extern crate chrono_tz;
 
 mod event;
+mod periodic;
 mod events;
 mod errors;
 
diff --git a/src/periodic.rs b/src/periodic.rs
new file mode 100644
index 0000000..0fa06ef
--- /dev/null
+++ b/src/periodic.rs
@@ -0,0 +1,64 @@
+use std::fmt;
+use std::str::FromStr;
+
+use event::Event;
+use errors::EventError;
+
+#[derive(Debug)]
+pub struct Periodic {
+    pub event: Event,
+    pub freq: Freq,
+    // TODO: until, count, interval, ...
+}
+
+#[derive(Debug)]
+pub enum Freq {
+    Secondly,
+    Minutely,
+    Hourly,
+    Daily,
+    Weekly,
+    Monthly,
+    Yearly,
+}
+
+impl Periodic {
+    pub fn new() -> Self {
+        Self {
+            event: Event::new(),
+            freq: Freq::Secondly,
+        }
+    }
+
+    pub fn set_param(&mut self, param: &str, value: &str) -> Result<(), EventError> {
+        match param {
+            "FREQ" => self.freq = value.parse()?,
+            _ => (),
+        }
+        Ok(())
+    }
+}
+
+impl fmt::Display for Periodic {
+    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+        write!(f, "{:?}: {}", self.freq, self.event)?;
+        Ok(())
+    }
+}
+
+impl FromStr for Freq {
+    type Err = EventError;
+
+    fn from_str(s: &str) -> Result<Self, Self::Err> {
+        match s {
+            "SECONDLY" => Ok(Freq::Secondly),
+            "MINUTELY" => Ok(Freq::Minutely),
+            "HOURLY" => Ok(Freq::Hourly),
+            "DAILY" => Ok(Freq::Daily),
+            "WEEKLY" => Ok(Freq::Weekly),
+            "MONTHLY" => Ok(Freq::Monthly),
+            "YEARLY" => Ok(Freq::Yearly),
+            _ => Err(EventError::FreqError),
+        }
+    }
+}
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