Move yearly recurrence out of Event and into scheduler

src/commands/schedule_csv.rs

@@ -25,7 +25,12 @@ struct CsvRecord {
     dinner: String,
 }
 
-pub async fn with(api_client: &ApiClient, calendar: &str, csv_file: &Path) -> Result<()> {
+pub async fn with(
+    api_client: &ApiClient,
+    calendar: &str,
+    csv_file: &Path,
+    yearly_recurring_events: bool,
+) -> Result<()> {
     let mut csv = csv::Reader::from_path(csv_file)?;
     let records = csv.deserialize::<CsvRecord>().flatten().collect::<Vec<_>>();
 
@@ -51,7 +56,7 @@ pub async fn with(api_client: &ApiClient, calendar: &str, csv_file: &Path) -> Re
         })
         .flatten();
 
-    publish_events(&api_client, calendar, events).await?;
+    publish_events(&api_client, calendar, events, yearly_recurring_events).await?;
     Ok(())
 }
 
@@ -111,6 +116,7 @@ async fn publish_events<'a, EventsIter>(
     api_client: &ApiClient,
     calendar: &str,
     events: EventsIter,
+    yearly_recurring_events: bool,
 ) -> Result<()>
 where
     EventsIter: Iterator<Item = Event>,
@@ -134,9 +140,28 @@ where
             &ev.ends_at.date(),
             &ev.recipe.name
         );
-        let cal = icalendar::Calendar::new()
-            .push::<icalendar::Event>(ev.into())
-            .done();
+
+        let end_time = ev.ends_at;
+        let mut event: icalendar::Event = ev.into();
+
+        if yearly_recurring_events {
+            use chrono::Datelike;
+            use icalendar::Component;
+
+            const DAY_NAMES: [&str; 7] = ["MO", "TU", "WE", "TH", "FR", "SA", "SU"];
+            event.add_property(
+                "RRULE",
+                &format!(
+                    "FREQ=YEARLY;BYDAY={weekday};BYWEEKNO={weekno}",
+                    weekday = DAY_NAMES
+                        .get(end_time.weekday().num_days_from_monday() as usize)
+                        .unwrap(),
+                    weekno = end_time.iso_week().week(),
+                ),
+            );
+        }
+
+        let cal = icalendar::Calendar::new().push(event).done();
 
         let cal_as_string = (&cal.to_string())
             .replacen(