wip: let's figure out how edn keymaps will work

input/Cargo.toml

@@ -5,3 +5,6 @@ version = "0.2.0"
 
 [dependencies]
 tek_edn = { path = "../edn" }
+
+[dev-dependencies]
+tek_tui = { path = "../tui" }

input/src/edn_cmd.rs

@@ -5,10 +5,22 @@ use std::marker::PhantomData;
 /// Turns an EDN symbol sequence into a command enum variant.
 pub trait EdnCommand<C>: Command<C> {
     fn from_edn <'a> (state: &C, head: &EdnItem<&str>, tail: &'a [EdnItem<String>]) -> Self;
+    fn get_isize (state: &C, item: &EdnItem<&str>) -> Option<isize> {
+        None
+    }
+    fn get_usize (state: &C, item: &EdnItem<&str>) -> Option<usize> {
+        None
+    }
+    fn get_bool  (state: &C, item: &EdnItem<&str>) -> Option<usize> {
+        None
+    }
 }
 
 pub trait EdnInput: Input {
     fn matches (&self, token: &str) -> bool;
+    fn get_event <S: AsRef<str>> (_: &EdnItem<S>) -> Option<Self::Event> {
+        None
+    }
 }
 
 pub struct EdnKeymap(pub Vec<EdnItem<String>>);