Merge pull request #100 from fmeringdal/fix/display-rruleset

Fix display impl for RRuleSet

CHANGELOG.md

@@ -11,6 +11,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - Make `ParseError` and `ValidationError` public
 - `EXRULE`s are now correctly added as exrules on the `RRuleSet` when parsed from a string, instead of being incorrectly added as an rrule.
 - Add a `RRuleSet::set_from_string` method to support loading rules without DTSTART. This is useful particularly when working with the Google Calendar API.
+- Fix to include `RDATE`, `EXRULE` and `EXDATE` values if used in the `Display` implementation of `RRuleSet`.
 
 ## 0.11.0 (2023-07-18)
 

rrule/src/core/rruleset.rs

@@ -284,14 +284,107 @@ impl Display for RRuleSet {
     /// Prints a valid set of iCalendar properties which can be used to create a new [`RRuleSet`] later.
     /// You may use the generated string to create a new iCalendar component, like VEVENT.
     fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
-        let properties = self
+        let start_datetime = format!("DTSTART{}", datetime_to_ical_format(&self.dt_start));
+
+        let mut rrules = self
             .rrule
             .iter()
-            .map(ToString::to_string)
+            .map(|rrule| format!("RRULE:{rrule}"))
+            .collect::<Vec<_>>()
+            .join("\n");
+        if !rrules.is_empty() {
+            rrules = format!("\n{rrules}");
+        }
+
+        let mut rdates = self
+            .rdate
+            .iter()
+            .map(|dt| dt.format("%Y%m%dT%H%M%SZ").to_string())
+            .collect::<Vec<_>>()
+            .join(",");
+        if !rdates.is_empty() {
+            // TODO: check if original VALUE prop was DATE or PERIOD
+            rdates = format!("\nRDATE;VALUE=DATE-TIME:{rdates}");
+        }
+
+        let mut exrules = self
+            .exrule
+            .iter()
+            .map(|exrule| format!("EXRULE:{exrule}"))
             .collect::<Vec<_>>()
             .join("\n");
-        let datetime = datetime_to_ical_format(&self.dt_start);
+        if !exrules.is_empty() {
+            exrules = format!("\n{exrules}");
+        }
+
+        let mut exdates = self
+            .exdate
+            .iter()
+            .map(|dt| dt.format("%Y%m%dT%H%M%SZ").to_string())
+            .collect::<Vec<_>>()
+            .join(",");
+        if !exdates.is_empty() {
+            // TODO: check if original VALUE prop was DATE or PERIOD
+            exdates = format!("\nEXDATE;VALUE=DATE-TIME:{exdates}");
+        }
+
+        write!(f, "{start_datetime}{rrules}{rdates}{exrules}{exdates}")
+    }
+}
 
-        write!(f, "DTSTART{}\n{}", datetime, properties)
+#[cfg(feature = "exrule")]
+#[cfg(test)]
+mod tests {
+    use std::str::FromStr;
+
+    use chrono::{Month, TimeZone};
+
+    use crate::{Frequency, RRule, RRuleSet, Tz};
+
+    #[test]
+    fn rruleset_string_roundtrip() {
+        let rruleset_str = "DTSTART:20120201T093000Z\nRRULE:FREQ=DAILY;COUNT=3;BYHOUR=9;BYMINUTE=30;BYSECOND=0\nRDATE;VALUE=DATE-TIME:19970101T000000Z,19970120T000000Z\nEXRULE:FREQ=YEARLY;COUNT=8;BYMONTH=6,7;BYMONTHDAY=1;BYHOUR=9;BYMINUTE=30;BYSECOND=0\nEXDATE;VALUE=DATE-TIME:19970121T000000Z";
+        let rruleset = RRuleSet::from_str(rruleset_str).unwrap();
+
+        // Check start date
+        let dt_start = Tz::UTC.with_ymd_and_hms(2012, 2, 1, 9, 30, 0).unwrap();
+        assert_eq!(rruleset.dt_start, dt_start);
+
+        // Check rrule
+        assert_eq!(
+            rruleset.rrule,
+            vec![RRule::new(Frequency::Daily)
+                .count(3)
+                .validate(dt_start)
+                .unwrap()]
+        );
+
+        // Check rdate
+        assert_eq!(
+            rruleset.rdate,
+            vec![
+                Tz::UTC.with_ymd_and_hms(1997, 1, 1, 0, 0, 0).unwrap(),
+                Tz::UTC.with_ymd_and_hms(1997, 1, 20, 0, 0, 0).unwrap()
+            ]
+        );
+
+        // Check exrule
+        assert_eq!(
+            rruleset.exrule,
+            vec![RRule::new(Frequency::Yearly)
+                .count(8)
+                .by_month(&[Month::June, Month::July])
+                .validate(dt_start)
+                .unwrap()]
+        );
+
+        // Check exdate
+        assert_eq!(
+            rruleset.exdate,
+            vec![Tz::UTC.with_ymd_and_hms(1997, 1, 21, 0, 0, 0).unwrap()]
+        );
+
+        // Serialize to string again
+        assert_eq!(rruleset.to_string(), rruleset_str);
     }
 }

rrule/src/parser/content_line/date_content_line.rs

@@ -1,5 +1,7 @@
 use std::{collections::HashMap, str::FromStr};
 
+use log::warn;
+
 use crate::{
     core::DateTime,
     parser::{
@@ -39,6 +41,33 @@ impl<'a> TryFrom<ContentLineCaptures<'a>> for Vec<DateTime> {
             .transpose()?
             .unwrap_or_default();
 
+        match parameters
+            .get(&DateParameter::Value)
+            .map(|val| val.to_ascii_lowercase())
+            .as_deref()
+        {
+            Some("date") => {
+                warn!(
+                    "Parameter `DATE` is not supported for property name: `{}`. The dates will be interpreter with the `DATE-TIME` parameter instead.",
+                    value.property_name
+                );
+            }
+            Some("period") => {
+                warn!(
+                    "Parameter `PERIOD` is not supported for property name: `{}`. The dates will be interpreter with the `DATE-TIME` parameter instead.",
+                    value.property_name
+                );
+            }
+            Some("date-time") => {}
+            Some(param) => {
+                warn!(
+                    "Encountered unexpected parameter `{param}` for property name: `{}`",
+                    value.property_name
+                );
+            }
+            None => {}
+        }
+
         let timezone = parameters
             .get(&DateParameter::Timezone)
             .map(|tz| parse_timezone(tz))