From 20b06eda3998eac7632fb5b2ef549e613125fad0 Mon Sep 17 00:00:00 2001
From: Tom Quist <tom@ashbyhq.com>
Date: Fri, 3 May 2024 22:00:31 +0200
Subject: [PATCH] fix: render weekdays as valid rrule strings

Previously, weekdays would've been rendered by their built-in name.
---
 rrule/src/core/rrule.rs       |  2 +-
 rrule/src/tests/regression.rs | 12 +++++++++++-
 2 files changed, 12 insertions(+), 2 deletions(-)

diff --git a/rrule/src/core/rrule.rs b/rrule/src/core/rrule.rs
index b3fadde..3ea9838 100644
--- a/rrule/src/core/rrule.rs
+++ b/rrule/src/core/rrule.rs
@@ -656,7 +656,7 @@ impl<S> Display for RRule<S> {
 
         // Monday is the default, no need to expose it.
         if self.week_start != Weekday::Mon {
-            res.push(format!("WKST={}", &self.week_start));
+            res.push(format!("WKST={}", weekday_to_str(self.week_start)));
         }
 
         if !self.by_set_pos.is_empty() {
diff --git a/rrule/src/tests/regression.rs b/rrule/src/tests/regression.rs
index debfbc2..1342045 100644
--- a/rrule/src/tests/regression.rs
+++ b/rrule/src/tests/regression.rs
@@ -1,7 +1,7 @@
 use chrono::Month;
 
 use crate::tests::common;
-use crate::{Frequency, RRule, RRuleSet};
+use crate::{Frequency, RRule, RRuleSet, Unvalidated};
 
 #[test]
 fn issue_34() {
@@ -60,3 +60,13 @@ fn issue_97() {
         "FREQ=YEARLY;BYMONTH=12;BYMONTHDAY=24,25,26"
     );
 }
+
+#[test]
+fn issue_111() {
+    let rrule = "RRULE:FREQ=WEEKLY;INTERVAL=1;BYDAY=TU;WKST=SU"
+        .parse::<RRule<Unvalidated>>();
+
+        // Convert to string...
+    let rrule_str = format!("{}", rrule.unwrap());
+    assert!(rrule_str.contains("WKST=SU"));
+}
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