Simplify definition of key bindings

src/key_bind.rs

@@ -0,0 +1,101 @@
+use cosmic::iced::keyboard::{KeyCode, Modifiers};
+use serde::{Deserialize, Serialize};
+use std::{collections::HashMap, fmt};
+
+use crate::Action;
+
+#[derive(Clone, Copy, Debug, Deserialize, Eq, Hash, Ord, PartialEq, PartialOrd, Serialize)]
+pub enum Modifier {
+    Super,
+    Ctrl,
+    Alt,
+    Shift,
+}
+
+#[derive(Clone, Debug, Deserialize, Eq, Hash, Ord, PartialEq, PartialOrd, Serialize)]
+pub struct KeyBind {
+    pub modifiers: Vec<Modifier>,
+    pub key_code: KeyCode,
+}
+
+impl KeyBind {
+    pub fn matches(&self, modifiers: Modifiers, key_code: KeyCode) -> bool {
+        self.key_code == key_code
+            && modifiers.logo() == self.modifiers.contains(&Modifier::Super)
+            && modifiers.control() == self.modifiers.contains(&Modifier::Ctrl)
+            && modifiers.alt() == self.modifiers.contains(&Modifier::Alt)
+            && modifiers.shift() == self.modifiers.contains(&Modifier::Shift)
+    }
+}
+
+impl fmt::Display for KeyBind {
+    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+        for modifier in self.modifiers.iter() {
+            write!(f, "{:?} + ", modifier)?;
+        }
+        write!(f, "{:?}", self.key_code)
+    }
+}
+
+pub fn key_binds() -> HashMap<KeyBind, Action> {
+    let mut key_binds = HashMap::new();
+
+    macro_rules! bind {
+        ([$($modifier:ident),+ $(,)?], $key_code:ident, $action:ident) => {{
+            key_binds.insert(
+                KeyBind {
+                    modifiers: vec![$(Modifier::$modifier),+],
+                    key_code: KeyCode::$key_code,
+                },
+                Action::$action,
+            );
+        }};
+    }
+
+    // Standard key bindings
+    bind!([Ctrl, Shift], A, SelectAll);
+    bind!([Ctrl, Shift], C, Copy);
+    bind!([Ctrl, Shift], F, Find);
+    bind!([Ctrl, Shift], T, TabNew);
+    bind!([Ctrl, Shift], V, Paste);
+    bind!([Ctrl, Shift], W, TabClose);
+
+    // Ctrl+Alt+D splits horizontally, Ctrl+Alt+R splits vertically, Ctrl+Shift+X maximizes split
+    //TODO: Adjust bindings as desired by UX
+    bind!([Ctrl, Alt], D, PaneSplitHorizontal);
+    bind!([Ctrl, Alt], R, PaneSplitVertical);
+    bind!([Ctrl, Shift], X, PaneToggleMaximized);
+
+    // Ctrl+Tab and Ctrl+Shift+Tab cycle through tabs
+    // Ctrl+Tab is not a special key for terminals and is free to use
+    bind!([Ctrl], Tab, TabNext);
+    bind!([Ctrl, Shift], Tab, TabPrev);
+
+    // Ctrl+Shift+# activates tabs by index
+    bind!([Ctrl, Shift], Key1, TabActivate0);
+    bind!([Ctrl, Shift], Key2, TabActivate1);
+    bind!([Ctrl, Shift], Key3, TabActivate2);
+    bind!([Ctrl, Shift], Key4, TabActivate3);
+    bind!([Ctrl, Shift], Key5, TabActivate4);
+    bind!([Ctrl, Shift], Key6, TabActivate5);
+    bind!([Ctrl, Shift], Key7, TabActivate6);
+    bind!([Ctrl, Shift], Key8, TabActivate7);
+    bind!([Ctrl, Shift], Key9, TabActivate8);
+
+    // Ctrl+0, Ctrl+-, and Ctrl+= are not special keys for terminals and are free to use
+    bind!([Ctrl], Key0, ZoomReset);
+    bind!([Ctrl], Minus, ZoomOut);
+    bind!([Ctrl], Equals, ZoomIn);
+
+    // Ctrl+Arrows and Ctrl+HJKL move between splits
+    bind!([Ctrl, Shift], Left, PaneFocusLeft);
+    bind!([Ctrl, Shift], H, PaneFocusLeft);
+    bind!([Ctrl, Shift], Down, PaneFocusDown);
+    bind!([Ctrl, Shift], J, PaneFocusDown);
+    bind!([Ctrl, Shift], Up, PaneFocusUp);
+    bind!([Ctrl, Shift], K, PaneFocusUp);
+    bind!([Ctrl, Shift], Right, PaneFocusRight);
+    bind!([Ctrl, Shift], L, PaneFocusRight);
+
+    key_binds
+}