feat(cph): add outline export command

crates/cph-typst/src/lib.rs

@@ -39,10 +39,10 @@ mod embedded;
 mod manifest;
 mod world;
 
+use cph_diag::{DiagCode, Diagnostic};
 use std::path::PathBuf;
 
-use cph_diag::{DiagCode, Diagnostic};
-use cph_model::{Artifact, Bundle, Lesson, Step, TargetConfig};
+use cph_model::{Artifact, Bundle, Lesson, OutlineDocument, Step, TargetConfig};
 use typst_kit::fonts::{self, FontStore};
 use typst_layout::PagedDocument;
 use typst_pdf::PdfOptions;
@@ -139,6 +139,34 @@ impl Engine {
         typst_pdf::pdf(&doc, &PdfOptions::default()).map_err(|errors| map_all(&world, &errors))
     }
 
+    /// Build a PDF for an outline document without creating files in the lesson.
+    ///
+    /// The outline entrypoint and its TOML data are served by an in-memory
+    /// [`LessonWorld`]. This keeps outline generation independent of any
+    /// declared lesson export target while reusing the embedded fonts and PDF
+    /// backend.
+    pub fn build_outline_pdf(&self, outline: &OutlineDocument) -> Result<Vec<u8>, Vec<Diagnostic>> {
+        const SOURCE: &str = r#"#import "@local/cph-render:0.1.0": render-outline
+#let outline = toml(sys.inputs.outline)
+#render-outline(outline)
+"#;
+
+        let outline_src = toml::to_string(outline).expect("outline serializes to TOML");
+        let world = LessonWorld::new_outline(
+            PathBuf::from("."),
+            self.render_dir.clone(),
+            SOURCE.to_owned(),
+            outline_src,
+            self.fonts.clone(),
+        );
+        let warned = typst::compile::<PagedDocument>(&world);
+        let doc = match warned.output {
+            Ok(doc) => doc,
+            Err(errors) => return Err(map_all(&world, &errors)),
+        };
+        typst_pdf::pdf(&doc, &PdfOptions::default()).map_err(|errors| map_all(&world, &errors))
+    }
+
     /// Build the [`LessonWorld`] for `(lesson, target)`, or `Err(blocking)` when
     /// the request cannot be honored (see [`target_precheck`]).
     fn world_for(&self, lesson: &Lesson, target: &str) -> Result<LessonWorld, Vec<Diagnostic>> {