core: start on key2Callback for the new callback that uses KeyEncoder

src/Surface.zig

@@ -1139,40 +1139,79 @@ pub fn charCallback(
     try self.io_thread.wakeup.notify();
 }
 
-/// A key input event.
-pub const KeyEvent = struct {
-    /// The action: press, release, etc.
-    action: input.Action,
-
-    /// "key" is the logical key that was pressed. For example, if
-    /// a Dvorak keyboard layout is being used on a US keyboard,
-    /// the "i" physical key will be reported as "c". The physical
-    /// key is the key that was physically pressed on the keyboard.
-    key: input.Key,
-    physical_key: input.Key,
-
-    /// Mods are the modifiers that are pressed.
-    mods: input.Mods,
-
-    /// The mods that were consumed in order to generate the text
-    /// in utf8. This has the mods set that were consumed, so to
-    /// get the set of mods that are effective you must negate
-    /// mods with this.
-    ///
-    /// This field is meaningless if utf8 is empty.
-    consumed_mods: input.Mods,
-
-    /// Composing is true when this key event is part of a dead key
-    /// composition sequence and we're in the middle of it.
-    composing: bool,
-
-    /// The utf8 sequence that was generated by this key event.
-    /// This will be an empty string if there is no text generated.
-    /// If composing is true and this is non-empty, this is preedit
-    /// text.
-    utf8: []const u8,
+pub fn key2Callback(
+    self: *Surface,
+    event: input.KeyEvent,
+) !bool {
+    // Before encoding, we see if we have any keybindings for this
+    // key. Those always intercept before any encoding tasks.
+    if (event.action == .press or event.action == .repeat) {
+        const binding_mods = event.mods.effectiveMods().binding();
+        const binding_action_: ?input.Binding.Action = action: {
+            var trigger: input.Binding.Trigger = .{
+                .mods = binding_mods,
+                .key = event.key,
             };
 
+            const set = self.config.keybind.set;
+            if (set.get(trigger)) |v| break :action v;
+
+            trigger.key = event.physical_key;
+            trigger.physical = true;
+            if (set.get(trigger)) |v| break :action v;
+
+            break :action null;
+        };
+
+        if (binding_action_) |binding_action| {
+            //log.warn("BINDING ACTION={}", .{binding_action});
+            try self.performBindingAction(binding_action);
+            return true;
+        }
+    }
+
+    // No binding, so we have to perform an encoding task. This
+    // may still result in no encoding. Under different modes and
+    // inputs there are many keybindings that result in no encoding
+    // whatsoever.
+    const enc: input.KeyEncoder = enc: {
+        self.renderer_state.mutex.lock();
+        defer self.renderer_state.mutex.unlock();
+        const t = &self.io.terminal;
+        break :enc .{
+            .event = event,
+            .alt_esc_prefix = t.modes.get(.alt_esc_prefix),
+            .cursor_key_application = t.modes.get(.cursor_keys),
+            .keypad_key_application = t.modes.get(.keypad_keys),
+            .modify_other_keys_state_2 = t.flags.modify_other_keys_2,
+        };
+    };
+
+    var data: termio.Message.WriteReq.Small.Array = undefined;
+    const seq = try enc.legacy(&data);
+    if (seq.len == 0) return false;
+
+    _ = self.io_thread.mailbox.push(.{
+        .write_small = .{
+            .data = data,
+            .len = seq.len,
+        },
+    }, .{ .forever = {} });
+    try self.io_thread.wakeup.notify();
+
+    // If we have a sequence to emit then we always want to clear the
+    // selection and scroll to the bottom.
+    {
+        self.renderer_state.mutex.lock();
+        defer self.renderer_state.mutex.unlock();
+        self.setSelection(null);
+        try self.io.terminal.scrollViewport(.{ .bottom = {} });
+        try self.queueRender();
+    }
+
+    return true;
+}
+
 /// Called for a single key event.
 ///
 /// This will return true if the key was handled/consumed. In that case,

src/input/KeyEncoder.zig

@@ -25,7 +25,7 @@ modify_other_keys_state_2: bool = false,
 /// These together combine the legacy protocol because they're all
 /// meant to be extensions that do not change any existing behavior
 /// and therefore safe to combine.
-fn legacy(
+pub fn legacy(
     self: *const KeyEncoder,
     buf: []u8,
 ) ![]const u8 {