check for empty cloze cards when rendering as well

qt/aqt/addcards.py

@@ -169,9 +169,7 @@ class AddCards(QDialog):
             showWarning(problem, help="AddItems#AddError")
             return None
         if note.model()["type"] == MODEL_CLOZE:
-            if not self.mw.col.models._availClozeOrds(
+            if not note.cloze_numbers_in_fields():
-                note.model(), note.joinedFields(), False
-            ):
                 if not askUser(
                     _(
                         "You have a cloze deletion note type "

rslib/ftl/card-template-rendering.ftl

@@ -37,3 +37,6 @@ card-template-rendering-no-such-field =
 # either due to a badly-designed template, or because required fields
 # are missing.
 card-template-rendering-empty-front = The front of this card is blank.
+
+card-template-rendering-missing-cloze = No cloze { $number } found on card.
+  Please either add a cloze deletion, or use the Empty Cards tool.

rslib/src/notetype/mod.rs

@@ -312,6 +312,10 @@ impl NoteType {
             })
             .next()
     }
+
+    pub(crate) fn is_cloze(&self) -> bool {
+        matches!(self.config.kind(), NoteTypeKind::Cloze)
+    }
 }
 
 impl From<NoteType> for NoteTypeProto {

rslib/src/notetype/render.rs

@@ -109,7 +109,8 @@ impl Collection {
             )
         };
 
-        let (qnodes, anodes) = render_card(qfmt, afmt, &field_map, card.ord, &self.i18n)?;
+        let (qnodes, anodes) =
+            render_card(qfmt, afmt, &field_map, card.ord, nt.is_cloze(), &self.i18n)?;
         Ok(RenderCardOutput { qnodes, anodes })
     }
 

rslib/src/template.rs

@@ -2,8 +2,8 @@
 // License: GNU AGPL, version 3 or later; http://www.gnu.org/licenses/agpl.html
 
 use crate::err::{AnkiError, Result, TemplateError};
-use crate::i18n::{tr_strs, I18n, TR};
+use crate::i18n::{tr_args, tr_strs, I18n, TR};
-use crate::template_filters::apply_filters;
+use crate::{cloze::add_cloze_numbers_in_string, template_filters::apply_filters};
 use lazy_static::lazy_static;
 use nom::branch::alt;
 use nom::bytes::complete::{tag, take_until};
@@ -23,6 +23,8 @@ static TEMPLATE_ERROR_LINK: &str =
     "https://anki.tenderapp.com/kb/problems/card-template-has-a-problem";
 static TEMPLATE_BLANK_LINK: &str =
     "https://anki.tenderapp.com/kb/card-appearance/the-front-of-this-card-is-blank";
+static TEMPLATE_BLANK_CLOZE_LINK: &str =
+    "https://anki.tenderapp.com/kb/problems/no-cloze-found-on-card";
 
 // Lexing
 //----------------------------------------
@@ -521,6 +523,7 @@ pub fn render_card(
     afmt: &str,
     field_map: &HashMap<&str, Cow<str>>,
     card_ord: u16,
+    is_cloze: bool,
     i18n: &I18n,
 ) -> Result<(Vec<RenderedNode>, Vec<RenderedNode>)> {
     // prepare context
@@ -537,7 +540,20 @@ pub fn render_card(
         .map_err(|e| template_error_to_anki_error(e, true, i18n))?;
 
     // check if the front side was empty
-    if !qtmpl.renders_with_fields(context.nonempty_fields) {
+    if is_cloze {
+        if cloze_is_empty(field_map, card_ord) {
+            let info = format!(
+                "<div>{}<br><a href='{}'>{}</a></div>",
+                i18n.trn(
+                    TR::CardTemplateRenderingMissingCloze,
+                    tr_args!["number"=>card_ord+1]
+                ),
+                TEMPLATE_BLANK_CLOZE_LINK,
+                i18n.tr(TR::CardTemplateRenderingMoreInfo)
+            );
+            qnodes.push(RenderedNode::Text { text: info });
+        }
+    } else if !qtmpl.renders_with_fields(context.nonempty_fields) {
         let info = format!(
             "<div>{}<br><a href='{}'>{}</a></div>",
             i18n.tr(TR::CardTemplateRenderingEmptyFront),
@@ -545,7 +561,7 @@ pub fn render_card(
             i18n.tr(TR::CardTemplateRenderingMoreInfo)
         );
         qnodes.push(RenderedNode::Text { text: info });
-    };
+    }
 
     // answer side
     context.question_side = false;
@@ -556,6 +572,14 @@ pub fn render_card(
     Ok((qnodes, anodes))
 }
 
+fn cloze_is_empty(field_map: &HashMap<&str, Cow<str>>, card_ord: u16) -> bool {
+    let mut set = HashSet::with_capacity(4);
+    for field in field_map.values() {
+        add_cloze_numbers_in_string(field.as_ref(), &mut set);
+    }
+    !set.contains(&(card_ord + 1))
+}
+
 // Field requirements
 //----------------------------------------
 
@@ -1063,7 +1087,7 @@ mod test {
         let i18n = I18n::new(&[""], "", log::terminal());
         use crate::template::RenderedNode as FN;
 
-        let qnodes = super::render_card("test{{E}}", "", &map, 1, &i18n)
+        let qnodes = super::render_card("test{{E}}", "", &map, 1, false, &i18n)
             .unwrap()
             .0;
         assert_eq!(