well, it compiles. fails on run, though

edn/src/context.rs

@@ -1,10 +1,10 @@
 use crate::*;
-pub trait TryFromAtom<T>: Sized {
-    fn try_from_atom (state: &T, value: Value) -> Option<Self> {
+pub trait TryFromAtom<'a, T>: Sized {
+    fn try_from_atom (state: &'a T, value: Value<'a>) -> Option<Self> {
         if let Value::Exp(0, iter) = value { return Self::try_from_expr(state, iter) }
         None
     }
-    fn try_from_expr (_state: &T, _iter: TokenIter) -> Option<Self> {
+    fn try_from_expr (_state: &'a T, _iter: TokenIter<'a>) -> Option<Self> {
         None
     }
 }

input/src/keymap.rs

@@ -3,33 +3,40 @@ use crate::*;
 pub trait AtomInput: Input {
     fn matches_atom (&self, token: &str) -> bool;
 }
-pub trait KeyMap {
+pub trait KeyMap<'a> {
     /// Try to find a command that matches the current input event.
-    fn command <S, C: AtomCommand<S>, I: AtomInput> (&self, state: &S, input: &I) -> Option<C>;
+    fn command <S, C: AtomCommand<'a, S>, I: AtomInput> (&'a self, state: &'a S, input: &'a I)
+        -> Option<C>;
 }
-impl KeyMap for TokenIter<'_> {
-    fn command <S, C: AtomCommand<S>, I: AtomInput> (&self, state: &S, input: &I) -> Option<C> {
-        for token in *self {
-            if let Value::Exp(0, iter) = token.value() {
-                if let Some((Token { value: Value::Sym(binding), .. }, _)) = iter.next() {
-                    if input.matches_atom(binding) {
-                        if let Some(command) = C::try_from_expr(state, iter.clone()) {
-                            return Some(command)
-                        }
+impl<'a> KeyMap<'a> for TokenIter<'a> {
+    fn command <S, C: AtomCommand<'a, S>, I: AtomInput> (&'a self, state: &'a S, input: &'a I)
+        -> Option<C>
+    {
+        let iter = self.clone();
+        while let Some(next) = iter.next() {
+            match next {
+                (Token { value: Value::Exp(0, iter), .. }, _) => {
+                    let next = iter.next();
+                    match next {
+                        Some((Token { value: Value::Sym(binding), .. }, _)) => {
+                            if input.matches_atom(binding) {
+                                if let Some(command) = C::try_from_expr(state, iter.clone()) {
+                                    return Some(command)
+                                }
+                            }
+                        },
+                        _ => panic!("invalid config (expected symbol)")
                     }
-                } else {
-                    panic!("invalid config: {token:?}")
-                }
-            } else {
-                panic!("invalid config: {token:?}")
+                },
+                _ => panic!("invalid config (expected expression)")
             }
         }
         None
     }
 }
 /// A [Command] that can be constructed from a [Token].
-pub trait AtomCommand<C>: TryFromAtom<C> + Command<C> {}
-impl<C, T: TryFromAtom<C> + Command<C>> AtomCommand<C> for T {}
+pub trait AtomCommand<'a, C>: TryFromAtom<'a, C> + Command<C> {}
+impl<'a, C, T: TryFromAtom<'a, C> + Command<C>> AtomCommand<'a, C> for T {}
 /** Implement `AtomCommand` for given `State` and `Command` */
 #[macro_export] macro_rules! atom_command {
     ($Command:ty : |$state:ident:<$State:ident: $Trait:path>| { $((
@@ -53,7 +60,7 @@ impl<C, T: TryFromAtom<C> + Command<C>> AtomCommand<C> for T {}
         // bound command:
         $command:expr
     ))* }) => {
-        impl<$State: $Trait> TryFromAtom<$State> for $Command {
+        impl<'a, $State: $Trait> TryFromAtom<'a, $State> for $Command {
             fn try_from_expr ($state: &$State, iter: TokenIter) -> Option<Self> {
                 match $iter.next() {
                     $(Some((Token { value: Value::Key($key), .. }, _)) => {
@@ -94,7 +101,7 @@ impl<C, T: TryFromAtom<C> + Command<C>> AtomCommand<C> for T {}
         // bound command:
         $command:expr
     ))* }) => {
-        impl TryFromAtom<$State> for $Command {
+        impl<'a> TryFromAtom<'a, $State> for $Command {
             fn try_from_expr ($state: &$State, iter: TokenIter) -> Option<Self> {
                 match iter.next() {
                     $(Some((Token { value: Value::Key($key), .. }, _)) => {

output/src/op_cond.rs

@@ -10,7 +10,7 @@ try_from_expr!(<'a, E>: When<RenderBox<'a, E>>: |state, iter| {
         let iter = iter.clone();
         let condition = iter.next();
         if let Some((ref condition, _)) = condition {
-            let condition = state.get_bool(&condition.value).expect("no condition");
+            let condition = state.get(&condition.value).expect("no condition");
             if let Some((ref content, _)) = iter.next() {
                 let content = state.get_content(&content.value).expect("no atom");
                 return Some(Self(condition, content))
@@ -23,7 +23,7 @@ try_from_expr!(<'a, E>: Either<RenderBox<'a, E>, RenderBox<'a, E>>: |state, iter
         let iter = iter.clone();
         let condition = iter.next();
         if let Some((ref condition, _)) = condition {
-            let condition = state.get_bool(&condition.value).expect("no condition");
+            let condition = state.get(&condition.value).expect("no condition");
             if let Some((ref content1, _)) = iter.next() {
                 let content1 = state.get_content(&content1.value).expect("no content1");
                 if let Some((ref content2, _)) = iter.next() {

output/src/op_transform.rs

@@ -12,9 +12,9 @@ macro_rules! transform_xy {
             pub fn y (item: T)  -> Self { Self::Y(item) }
             pub fn xy (item: T) -> Self { Self::XY(item) }
         }
-        impl<'a, E: Output + 'a, T: ViewContext<'a, E>> TryFromAtom<T>
+        impl<'a, E: Output + 'a, T: ViewContext<'a, E>> TryFromAtom<'a, T>
         for $Enum<RenderBox<'a, E>> {
-            fn try_from_expr (state: &T, iter: TokenIter) -> Option<Self> {
+            fn try_from_expr (state: &'a T, iter: TokenIter<'a>) -> Option<Self> {
                 Some(if let Some((Token { value: Value::Key($x), .. }, _)) = iter.next() {
                     Self::x(state.get_content(&iter.next().expect("no content").0.value).expect("no content"))
                 } else if let Some((Token { value: Value::Key($y), .. }, _)) = iter.next() {
@@ -51,20 +51,20 @@ macro_rules! transform_xy_unit {
             pub fn y (y: U, item: T) -> Self { Self::Y(y, item) }
             pub fn xy (x: U, y: U, item: T) -> Self { Self::XY(x, y, item) }
         }
-        impl<'a, E: Output + 'a, T: ViewContext<'a, E>> TryFromAtom<T>
+        impl<'a, E: Output + 'a, T: ViewContext<'a, E>> TryFromAtom<'a, T>
         for $Enum<E::Unit, RenderBox<'a, E>> {
-            fn try_from_expr (state: &T, iter: TokenIter) -> Option<Self> {
+            fn try_from_expr (state: &'a T, iter: TokenIter<'a>) -> Option<Self> {
                 Some(if let Some((Token { value: Value::Key($x), .. }, _)) = iter.next() {
-                    let x = state.get_unit(&iter.next().expect("no x").0.value).expect("no x");
+                    let x = state.get(&iter.next().expect("no x").0.value).expect("no x");
                     let c = state.get_content(&iter.next().expect("no content").0.value).expect("no content");
                     Self::x(x, c)
                 } else if let Some((Token { value: Value::Key($y), .. }, _)) = iter.next() {
-                    let y = state.get_unit(&iter.next().expect("no y").0.value).expect("no y");
+                    let y = state.get(&iter.next().expect("no y").0.value).expect("no y");
                     let c = state.get_content(&iter.next().expect("no content").0.value).expect("no content");
                     Self::y(y, c)
                 } else if let Some((Token { value: Value::Key($xy), .. }, _)) = iter.next() {
-                    let x = state.get_unit(&iter.next().expect("no x").0.value).expect("no x");
-                    let y = state.get_unit(&iter.next().expect("no y").0.value).expect("no y");
+                    let x = state.get(&iter.next().expect("no x").0.value).expect("no x");
+                    let y = state.get(&iter.next().expect("no y").0.value).expect("no y");
                     let c = state.get_content(&iter.next().expect("no content").0.value).expect("no content");
                     Self::xy(x, y, c)
                 } else {

output/src/view.rs

@@ -1,28 +1,25 @@
 use crate::*;
-use std::{sync::Arc, fmt::Debug};
-use Value::*;
-/// Define an EDN-backed view.
-///
-/// This consists of:
-/// * render callback (implementation of [Content])
-/// * value providers (implementations of [Context])
 #[macro_export] macro_rules! view {
-    ($Output:ty: |$self:ident: $App:ty| $content:expr $(;{
-        $( $type:ty { $($sym:literal => $value:expr),* } );*
-    })?) => {
-        impl Content<$Output> for $App {
-            fn content(&$self) -> impl Render<$Output> { $content }
+    ($Output:ty: |$self:ident: $State:ty| $expr:expr; {
+        $($sym:literal => $body:expr),* $(,)?
+    }) => {
+        impl Content<$Output> for $State {
+            fn content (&$self) -> impl Render<$Output> { $expr }
         }
-        $($(
-            impl Context<$type> for $App {
-                fn get (&$self, atom: &Value) -> Option<$type> {
-                    Some(match atom.to_ref() { $(Atom::Sym($sym) => $value,)* _ => return None })
+        impl<'a> ViewContext<'a, $Output> for $State {
+            fn get_content_custom (&'a $self, value: &Value<'a>) -> Option<RenderBox<'a, $Output>> {
+                if let Value::Sym(s) = value {
+                    match *s { $($sym => Some($body),)* _ => None }
+                } else {
+                    panic!("expected symbol")
                 }
             }
-        )*)?
+        }
     }
 }
 
+// An ephemeral wrapper around view state and view description,
+// that is meant to be constructed and returned from [Content::content].
 pub struct View<'a, T>(pub &'a T, pub TokenIter<'a>);
 impl<'a, O: Output + 'a, T: ViewContext<'a, O>> Content<O> for View<'a, T> {
     fn content (&self) -> impl Render<O> {
@@ -35,97 +32,36 @@ impl<'a, O: Output + 'a, T: ViewContext<'a, O>> Content<O> for View<'a, T> {
         return None
     }
 }
-
-/// Renders from EDN source and context.
-///
-/// Generic over:
-///
-/// * `O` - Output target.
-/// * `S` - State provider.
-/// * `A` - Atom storage type.
-#[derive(Default, Clone)] pub enum AtomView<'a, O, S, A> {
-    _Unused(std::marker::PhantomData<&'a O>),
-    #[default] Inert,
-    Src(S, &'a str),
-    Ref(S, &'a A),
-    Own(S, A),
-    Err(Arc<str>)
-}
-impl<'a, O, S, A> Debug for AtomView<'a, O, S, A>
-where S: Debug, A: Debug {
-    fn fmt (&self, f: &mut std::fmt::Formatter<'_>) -> Result<(), std::fmt::Error> {
-        match self {
-            Self::Inert =>
-                write!(f, "AtomView::Inert"),
-            Self::Src(state, view) =>
-                write!(f, "AtomView::Src(state={state:?} view={view:?}"),
-            Self::Ref(state, view) =>
-                write!(f, "AtomView::Ref(state={state:?} view={view:?}"),
-            Self::Own(state, view) =>
-                write!(f, "AtomView::Arc(state={state:?} view={view:?}"),
-            Self::Err(error) =>
-                write!(f, "AtomView::Err({error})"),
-            _ => unreachable!()
-        }
-    }
-}
-impl<'a, O, S, A> Content<O> for AtomView<'a, O, S, A>
-where O: Output, S: ViewContext<'a, O>, A: Send + Sync {
-    fn content (&self) -> impl Render<O> {
-        match self {
-            Self::Inert => { panic!("inert rendered") },
-            Self::Err(e) => { panic!("render error: {e}") },
-            Self::Src(state, source) => {},
-            Self::Ref(state, atom) => {},
-            Self::Own(state, atom) => {},
-            _ => unreachable!()
-        }
-    }
-}
-impl<'a, E: Output, T> ViewContext<'a, E> for T where T: Sized + Send + Sync
+// Provides components to the view.
+pub trait ViewContext<'a, E: Output + 'a>: Send + Sync
     + Context<bool>
     + Context<usize>
     + Context<E::Unit>
-    + Context<Box<dyn Render<E> + 'a>> {}
-/// Provides values to the template
-pub trait ViewContext<'a, E: Output>: Sized + Send + Sync
-    + Context<bool>
-    + Context<usize>
-    + Context<E::Unit>
-    + Context<Box<dyn Render<E> + 'a>>
 {
-    fn get_bool (&self, atom: &Value) -> Option<bool> {
-        Some(match atom {
-            Num(n) => match *n { 0 => false, _ => true },
-            Sym(x) => match *x {
-                ":false" | ":f" => false, ":true" | ":t" => true,
-                _ => return Context::get(self, atom)
-            },
-            _ => return Context::get(self, atom)
-        })
+    fn get_content (&'a self, value: &Value<'a>) -> Option<RenderBox<'a, E>> {
+        if let Some(builtin) = self.get_content_builtin(value) {
+            Some(builtin)
+        } else {
+            self.get_content_custom(value)
+        }
     }
-    fn get_usize (&self, atom: &Value) -> Option<usize> {
-        Some(match atom {Num(n) => *n, _ => return Context::get(self, atom)})
-    }
-    fn get_unit (&self, atom: &Value) -> Option<E::Unit> {
-        Some(match atom {Num(n) => E::Unit::from(*n as u16), _ => return Context::get(self, atom)})
-    }
-    fn get_content (&self, atom: &Value) -> Option<Box<dyn Render<E> + 'a>> where E: 'a {
-        try_delegate!(self, *atom, When::<RenderBox<'a, E>>);
-        try_delegate!(self, *atom, Either::<RenderBox<'a, E>, RenderBox<'a, E>>);
-        try_delegate!(self, *atom, Align::<RenderBox<'a, E>>);
-        try_delegate!(self, *atom, Bsp::<RenderBox<'a, E>, RenderBox<'a, E>>);
-        try_delegate!(self, *atom, Fill::<RenderBox<'a, E>>);
-        try_delegate!(self, *atom, Fixed::<_, RenderBox<'a, E>>);
-        try_delegate!(self, *atom, Min::<_, RenderBox<'a, E>>);
-        try_delegate!(self, *atom, Max::<_, RenderBox<'a, E>>);
-        try_delegate!(self, *atom, Shrink::<_, RenderBox<'a, E>>);
-        try_delegate!(self, *atom, Expand::<_, RenderBox<'a, E>>);
-        try_delegate!(self, *atom, Push::<_, RenderBox<'a, E>>);
-        try_delegate!(self, *atom, Pull::<_, RenderBox<'a, E>>);
-        try_delegate!(self, *atom, Margin::<_, RenderBox<'a, E>>);
-        try_delegate!(self, *atom, Padding::<_, RenderBox<'a, E>>);
-        Some(Context::get_or_fail(self, atom))
+    fn get_content_custom (&'a self, value: &Value<'a>) -> Option<RenderBox<'a, E>>;
+    fn get_content_builtin (&'a self, value: &Value<'a>) -> Option<RenderBox<'a, E>> {
+        try_delegate!(self, *value, When::<RenderBox<'a, E>>);
+        try_delegate!(self, *value, Either::<RenderBox<'a, E>, RenderBox<'a, E>>);
+        try_delegate!(self, *value, Align::<RenderBox<'a, E>>);
+        try_delegate!(self, *value, Bsp::<RenderBox<'a, E>, RenderBox<'a, E>>);
+        try_delegate!(self, *value, Fill::<RenderBox<'a, E>>);
+        try_delegate!(self, *value, Fixed::<_, RenderBox<'a, E>>);
+        try_delegate!(self, *value, Min::<_, RenderBox<'a, E>>);
+        try_delegate!(self, *value, Max::<_, RenderBox<'a, E>>);
+        try_delegate!(self, *value, Shrink::<_, RenderBox<'a, E>>);
+        try_delegate!(self, *value, Expand::<_, RenderBox<'a, E>>);
+        try_delegate!(self, *value, Push::<_, RenderBox<'a, E>>);
+        try_delegate!(self, *value, Pull::<_, RenderBox<'a, E>>);
+        try_delegate!(self, *value, Margin::<_, RenderBox<'a, E>>);
+        try_delegate!(self, *value, Padding::<_, RenderBox<'a, E>>);
+        None
     }
 }
 #[macro_export] macro_rules! try_delegate {
@@ -135,17 +71,10 @@ pub trait ViewContext<'a, E: Output>: Sized + Send + Sync
         }
     }
 }
-// A function that returns a `RenderBox.
-pub type AtomCallback<'a, O, State> =
-    dyn Fn(&'a State)-> RenderBox<'a, O> + Send + Sync + 'a;
-// A box containing a function that returns a `RenderBox.
-pub type AtomRenderCallback<'a, O, State> =
-    Box<AtomCallback<'a, O, State>>;
-
 #[macro_export] macro_rules! try_from_expr {
     (<$l:lifetime, $E:ident>: $Struct:ty: |$state:ident, $atoms:ident|$body:expr) => {
-        impl<$l, $E: Output + $l, T: ViewContext<$l, $E>> TryFromAtom<T> for $Struct {
-            fn try_from_atom ($state: &T, atom: Value) -> Option<Self> {
+        impl<$l, $E: Output + $l, T: ViewContext<$l, $E>> TryFromAtom<$l, T> for $Struct {
+            fn try_from_atom ($state: &$l T, atom: Value<$l>) -> Option<Self> {
                 if let Value::Exp(0, $atoms) = atom {
                     $body;
                 }
@@ -154,28 +83,3 @@ pub type AtomRenderCallback<'a, O, State> =
         }
     }
 }
-/// Implement `Context` for a context and content type.
-///
-/// This enables support for layout expressions.
-#[macro_export] macro_rules! provide_content {
-    (|$self:ident:$State:ty|{ $($pat:pat => $expr:expr),* $(,)? }) => {
-        impl<E: Output> Context<Box<dyn Render<E> + '_>> for $State {
-            fn get (&$self, atom: &Value) -> Option<Box<dyn Render<E> + '_>> {
-                Some(match atom {
-                    $(Value::Sym($pat) => $expr,)*
-                    _ => return None
-                })
-            }
-        }
-    };
-    ($Output:ty: |$self:ident:$State:ty|{ $($pat:pat => $expr:expr),* $(,)? }) => {
-        impl Context<Box<dyn Render<$Output> + '_>> for $State {
-            fn get (&$self, atom: &Value) -> Option<Box<dyn Render<$Output> + '_>> {
-                Some(match atom {
-                    $(Value::Sym($pat) => $expr,)*
-                    _ => return None
-                })
-            }
-        }
-    }
-}

tek/src/lib.rs

@@ -175,7 +175,21 @@ provide_num!(usize: |self: Tek| {
     ":track"      => self.selected.track().unwrap_or(0),
     ":track-next" => (self.selected.track().unwrap_or(0) + 1).min(self.tracks.len()),
     ":track-prev" => self.selected.track().unwrap_or(0).saturating_sub(1) });
-view!(TuiOut: |self: Tek| self.size.of(View(self, self.view)));
+view!(TuiOut: |self: Tek| self.size.of(View(self, self.view)); {
+    ":editor"  => (&self.editor).boxed(),
+    ":pool"    => self.view_pool().boxed(),
+    ":sample"  => self.view_sample(self.is_editing()).boxed(),
+    ":sampler" => self.view_sampler(self.is_editing(), &self.editor).boxed(),
+    ":status"  => self.view_editor().boxed(),
+    ":toolbar" => self.view_clock().boxed(),
+    ":tracks"  => self.view_row(self.w(), 3, self.track_header(), self.track_cells()).boxed(),
+    ":inputs"  => self.view_row(self.w(), 3, self.input_header(), self.input_cells()).boxed(),
+    ":outputs" => self.view_row(self.w(), 3, self.output_header(), self.output_cells()).boxed(),
+    ":scenes"  => Outer(false, Style::default().fg(TuiTheme::g(0))).enclose_bg(self.view_row(
+        self.w(), self.size.h().saturating_sub(12) as u16,
+        self.scene_header(), self.clip_columns()
+    )).boxed()
+});
 provide_bool!(bool: |self: Tek| {});
 provide_num!(isize: |self: Tek| {});
 provide!(Color: |self: Tek| {});
@@ -191,20 +205,6 @@ provide_num!(u16: |self: Tek| {
         let w = self.size.w();
         if w > 60 { 20 } else if w > 40 { 15 } else { 10 } }
 });
-provide_content!(TuiOut: |self: Tek| {
-    ":editor"  => (&self.editor).boxed(),
-    ":pool"    => self.view_pool().boxed(),
-    ":sample"  => self.view_sample(self.is_editing()).boxed(),
-    ":sampler" => self.view_sampler(self.is_editing(), &self.editor).boxed(),
-    ":status"  => self.view_editor().boxed(),
-    ":toolbar" => self.view_clock().boxed(),
-    ":tracks"  => self.view_row(self.w(), 3, self.track_header(), self.track_cells()).boxed(),
-    ":inputs"  => self.view_row(self.w(), 3, self.input_header(), self.input_cells()).boxed(),
-    ":outputs" => self.view_row(self.w(), 3, self.output_header(), self.output_cells()).boxed(),
-    ":scenes"  => Outer(false, Style::default().fg(TuiTheme::g(0))).enclose_bg(self.view_row(
-        self.w(), self.size.h().saturating_sub(12) as u16,
-        self.scene_header(), self.clip_columns()
-    )).boxed() });
 impl Tek {
     fn new_clock (
         jack: &Arc<RwLock<JackConnection>>,