command system; first for transport

crates/tek_core/src/command.rs

@@ -0,0 +1,44 @@
+use crate::*;
+
+pub const fn key (code: KeyCode) -> KeyEvent {
+    KeyEvent {
+        code,
+        modifiers: KeyModifiers::NONE,
+        kind:      crossterm::event::KeyEventKind::Press,
+        state:     crossterm::event::KeyEventState::NONE
+    }
+}
+
+pub const fn ctrl (key: KeyEvent) -> KeyEvent {
+    KeyEvent { modifiers: key.modifiers.union(KeyModifiers::CONTROL), ..key }
+}
+
+pub const fn alt (key: KeyEvent) -> KeyEvent {
+    KeyEvent { modifiers: key.modifiers.union(KeyModifiers::ALT), ..key }
+}
+
+pub const fn shift (key: KeyEvent) -> KeyEvent {
+    KeyEvent { modifiers: key.modifiers.union(KeyModifiers::SHIFT), ..key }
+}
+
+pub trait Command<T>: Sized {
+    fn run (&self, state: &mut T) -> Perhaps<Self>;
+}
+
+pub trait HandleKey<C: Command<Self> + 'static>: Sized {
+    const HANDLE_KEY_MAP: &'static [(KeyEvent, C)];
+    fn handle_key (&mut self, key: &KeyEvent) -> Perhaps<C> {
+        let mut run_command: Option<&'static C> = None;
+        for (binding, command) in Self::HANDLE_KEY_MAP.iter() {
+            if key == binding {
+                run_command = Some(command);
+                break
+            }
+        }
+        if let Some(command) = run_command {
+            command.run(self)
+        } else {
+            Ok(None)
+        }
+    }
+}

crates/tek_core/src/lib.rs

@@ -38,6 +38,7 @@ use std::fmt::{Debug, Display};
 submod! {
     audio
     color
+    command
     edn
     engine
     focus