EdnViewData has to go?

output/src/edn_view.rs

@@ -1,6 +1,19 @@
 use crate::*;
 use std::marker::PhantomData;
 use EdnItem::*;
+/// Implements `EdnProvide` for content components and expressions
+#[macro_export] macro_rules! edn_provide_content {
+    (|$self:ident:$Stat:ty|{ $($pat:pat => $expr:expr),* $(,)? }) => {
+        impl<'a> EdnProvide<'a, Box<dyn Render<TuiOut> + 'a>> for $State {
+            fn get <S: AsRef<str>> (&'a $self, edn: &'a EdnItem<S>) -> Option<Box<dyn Render<TuiOut> + 'a>> {
+                Some(match edn.to_ref() {
+                    $(EdnItem::Sym($pat) => $expr),*,
+                    _ => return None
+                })
+            }
+        }
+    }
+}
 /// Renders from EDN source and context.
 #[derive(Default)]
 pub enum EdnView<'a, E: Output, T: EdnViewData<'a, E> + std::fmt::Debug> {