enable and patch up mod eval

src/eval.rs

@@ -1,4 +1,5 @@
-use crate::*;
+use crate::{*, term::*, draw::*, ratatui::prelude::*};
+use dizzle::*;
 
 /// Interpret layout operation.
 ///
@@ -165,7 +166,7 @@ use crate::*;
 /// impl     Understand<Tui, ()> for State {}
 /// # fn main () -> tengri::Usually<()> {
 /// let state = State;
-/// let mut out = TuiOut::default();
+/// let mut out = Tui::default();
 /// tengri::eval_view_tui(&state, &mut out, "")?;
 /// tengri::eval_view_tui(&state, &mut out, "text Hello world!")?;
 /// tengri::eval_view_tui(&state, &mut out, "fg (g 0) (text Hello world!)")?;
@@ -174,9 +175,9 @@ use crate::*;
 /// # Ok(()) }
 /// ```
 pub fn eval_view_tui <'a, S> (
-    state: &S, output: &mut Buffer, expr: impl Expression + 'a
+    state: &S, output: &mut Tui, expr: impl Expression + 'a
 ) -> Usually<bool> where
-    S: Understand<TuiOut, ()>
+    S: Understand<Tui, ()>
         + for<'b>Namespace<'b, bool>
         + for<'b>Namespace<'b, u16>
         + for<'b>Namespace<'b, Color>
@@ -199,18 +200,21 @@ pub fn eval_view_tui <'a, S> (
         Some("fg") => {
             let arg0  = arg0?.expect("fg: expected arg 0 (color)");
             let color = Namespace::namespace(state, arg0)?.unwrap_or_else(||panic!("fg: {arg0:?}: not a color"));
-            let thunk = Thunk::new(move|output: &mut Buffer|state.understand(output, &arg1).unwrap());
+            output.place(&fg(color, thunk(move|output: &mut Tui|{
-            output.place(&TuiOut::fg(color, thunk))
+                state.understand(output, &arg1)?;
+                // FIXME?: don't max out the used area?
+                Ok(output.area().into())
+            })))
         },
 
         Some("bg") => {
-            //panic!("expr: {expr:?}\nhead: {head:?}\nfrags: {frags:?}\nargs: {args:?}\narg0: {arg0:?}\ntail0: {tail0:?}\narg1: {arg1:?}\ntail1: {tail1:?}\narg2: {arg2:?}");
-            //panic!("head: {head:?}\narg0: {arg0:?}\narg1: {arg1:?}\narg2: {arg2:?}");;
-            //panic!("head: {head:?}\narg0: {arg0:?}\narg1: {arg1:?}\narg2: {arg2:?}");
             let arg0  = arg0?.expect("bg: expected arg 0 (color)");
             let color = Namespace::namespace(state, arg0)?.unwrap_or_else(||panic!("bg: {arg0:?}: not a color"));
-            let thunk = Thunk::new(move|output: &mut Buffer|state.understand(output, &arg1).unwrap());
+            output.place(&bg(color, thunk(move|output: &mut Tui|{
-            output.place(&TuiOut::bg(color, thunk))
+                state.understand(output, &arg1)?;
+                // FIXME?: don't max out the used area?
+                Ok(output.area().into())
+            })))
         },
 
         _ => return Ok(false)

src/lib.rs

@@ -25,6 +25,7 @@ pub(crate) use ::{
 
 #[cfg(feature = "lang")] pub extern crate dizzle as lang;
 #[cfg(feature = "lang")] pub use ::dizzle::{self, Usually, Perhaps, impl_default};
+#[cfg(feature = "lang")] pub mod eval;
 
 #[cfg(feature = "time")] pub mod time;