From 86aafa74a67dd06390b2bb0f7cb6ae9503152414 Mon Sep 17 00:00:00 2001
From: Damien Elmes <gpg@ankiweb.net>
Date: Thu, 7 Dec 2023 14:54:25 +1000
Subject: [PATCH] Treat cards with no reps like new cards

https://github.com/open-spaced-repetition/fsrs4anki/issues/540#issuecomment-1837780217
---
 rslib/src/scheduler/fsrs/memory_state.rs | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/rslib/src/scheduler/fsrs/memory_state.rs b/rslib/src/scheduler/fsrs/memory_state.rs
index abdb78e8c..dfc3a65cf 100644
--- a/rslib/src/scheduler/fsrs/memory_state.rs
+++ b/rslib/src/scheduler/fsrs/memory_state.rs
@@ -166,7 +166,7 @@ impl Card {
     ) -> Result<()> {
         let memory_state = if let Some(i) = item {
             Some(fsrs.memory_state(i.item, i.starting_state)?)
-        } else if self.ctype == CardType::New || self.interval == 0 {
+        } else if self.ctype == CardType::New || self.interval == 0 || self.reps == 0 {
             None
         } else {
             // no valid revlog entries; infer state from current card state
@@ -345,7 +345,10 @@ mod tests {
                 difficulty: 4.46429
             })
         );
-        let mut card = Card::default();
+        let mut card = Card {
+            reps: 1,
+            ..Default::default()
+        };
         card.set_memory_state(&fsrs, Some(item), 0.9)?;
         assert_eq!(
             card.memory_state,
@@ -390,6 +393,7 @@ mod tests {
             ctype: CardType::Review,
             interval: 100,
             ease_factor: 1300,
+            reps: 1,
             ..Default::default()
         };
         card.set_memory_state(&FSRS::new(Some(&[])).unwrap(), None, 0.9)?;