Use iterators and itertools to produce events

4 files changed, 21 insertions, 36 deletions

diff --git a/src/calendar.rs b/src/calendar.rs
index 6df2f74..fcec54e 100644
--- a/src/calendar.rs
+++ b/src/calendar.rs
@@ -2,9 +2,9 @@ use std::io::BufRead;
 use std::fmt;
 use ical::IcalParser;
 use chrono::Duration;
+use itertools::Itertools;
 
 use date::Date;
-use event;
 use event::{Event, End};
 use periodic::Periodic;
 use errors::EventError;
@@ -62,17 +62,13 @@ impl Calendar {
         Ok(Calendar { single, periodic })
     }
 
-    pub fn get(&self, first: &Date, last: &Date) -> Vec<Event> {
-        let mut events = event::get(&self.single, first, last).to_vec();
-        for p in &self.periodic {
-            let mut p_events = p.iter()
-                .skip_while(|e| e.end_date() < *first)
-                .take_while(|e| e.start <= *last)
-                .collect();
-            events.append(&mut p_events);
-        }
-        events.sort();
-        events
+    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(),
+        )
     }
 }
 
diff --git a/src/event.rs b/src/event.rs
index b5e9d27..e186cfd 100644
--- a/src/event.rs
+++ b/src/event.rs
@@ -94,17 +94,3 @@ impl FromStr for Status {
         }
     }
 }
-
-
-pub fn get<'a>(events: &'a Vec<Event>, first: &Date, last: &Date) -> &'a [Event] {
-    match events.iter().position(|ref e| e.start >= *first) {
-        None => &[],
-        Some(i) => {
-            let j = events
-                .iter()
-                .position(|ref e| e.end_date() > *last)
-                .unwrap_or(events.len());
-            &events[i..j]
-        }
-    }
-}
diff --git a/src/lib.rs b/src/lib.rs
index e754a11..b82b190 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -1,6 +1,7 @@
 extern crate ical;
 extern crate chrono;
 extern crate chrono_tz;
+extern crate itertools;
 
 mod date;
 mod event;
diff --git a/src/main.rs b/src/main.rs
index ce2284d..d531687 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -1,32 +1,34 @@
 extern crate almanac;
+extern crate itertools;
 
 use std::env;
 use std::io::BufReader;
 use std::fs::File;
+use itertools::Itertools;
 
 use almanac::Calendar;
 use almanac::Date;
 use almanac::Duration;
-use almanac::Event;
 
 fn main() {
     let first = Date::now();
     let last = first + Duration::days(7);
 
-    let mut events: Vec<_> = env::args()
-        .skip(1)
-        .map(|arg| ics_calendar(&arg, &first, &last))
-        .flatten()
-        .collect();
-    events.sort();
+    let calendars: Vec<_> = env::args().skip(1).map(|arg| ics_calendar(&arg)).collect();
+    let events = calendars
+        .iter()
+        .map(|c| c.iter())
+        .kmerge()
+        .skip_while(|e| e.end_date() < first)
+        .take_while(|e| e.start <= last);
+
     for event in events {
         println!("{}", event);
     }
 }
 
-fn ics_calendar(file_path: &str, first: &Date, last: &Date) -> Vec<Event> {
+fn ics_calendar(file_path: &str) -> Calendar {
     let file = File::open(file_path).unwrap();
     let buf = BufReader::new(file);
-    let calendar = Calendar::parse(buf).unwrap();
-    calendar.get(first, last)
+    Calendar::parse(buf).unwrap()
 }