feat: implement reports

src/commands/export.rs

@@ -290,7 +290,11 @@ fn pick_practice_variants(names: &[String]) -> Result<Vec<practice::Variant>> {
         .collect())
 }
 
-/// Resolves the `--variant` flags, defaulting to every document.
+/// Resolves the `--variant` flags, defaulting to the exam set.
+///
+/// The default is [`typst::Variant::EXAM`] rather than every variant: a
+/// diagnostic is built from responses, not from an assessment record, so
+/// `export typst` has nothing to build one out of.
 ///
 /// # Arguments
 ///
@@ -306,7 +310,7 @@ fn pick_practice_variants(names: &[String]) -> Result<Vec<practice::Variant>> {
 /// Returns [`Error::Usage`] naming the valid tokens.
 fn pick_variants(names: &[String]) -> Result<Vec<typst::Variant>> {
     if names.is_empty() {
-        return Ok(typst::Variant::ALL.to_vec());
+        return Ok(typst::Variant::EXAM.to_vec());
     }
     let mut wanted = Vec::new();
     for name in names {
@@ -384,7 +388,15 @@ pub(crate) fn template(cli: &Cli, sub: &TemplateCommand) -> Result<Outcome> {
             force,
             stdout,
         } => {
-            let variants = pick_variants(variant)?;
+            // `export typst` defaults to the exam set, because a report is not
+            // built from an assessment record. Dumping is the opposite case: with
+            // no `--variant` it should hand over every template there is,
+            // including the two reports.
+            let variants = if variant.is_empty() {
+                typst::Variant::ALL.to_vec()
+            } else {
+                pick_variants(variant)?
+            };
 
             if *stdout {
                 for (index, v) in variants.iter().enumerate() {