feat(parser): drawer parsing

src/export/html.rs

@@ -28,6 +28,12 @@ pub trait HtmlHandler<W: Write, E: From<Error>> {
     fn section_end(&mut self, w: &mut W) -> Result<(), E> {
         Ok(write!(w, "</section>")?)
     }
+    fn drawer_beg(&mut self, w: &mut W, name: &str) -> Result<(), E> {
+        Ok(())
+    }
+    fn drawer_end(&mut self, w: &mut W) -> Result<(), E> {
+        Ok(())
+    }
     fn paragraph_beg(&mut self, w: &mut W) -> Result<(), E> {
         Ok(write!(w, "<p>")?)
     }

src/export/mod.rs

@@ -10,6 +10,8 @@ macro_rules! handle_event {
             SectionEnd => $handler.section_end($writer)?,
             ParagraphBeg => $handler.paragraph_beg($writer)?,
             ParagraphEnd => $handler.paragraph_end($writer)?,
+            DrawerBeg(n) => $handler.drawer_beg($writer, n)?,
+            DrawerEnd => $handler.drawer_end($writer)?,
             CtrBlockBeg => $handler.ctr_block_beg($writer)?,
             CtrBlockEnd => $handler.ctr_block_end($writer)?,
             QteBlockBeg => $handler.qte_block_beg($writer)?,