terminal: improve function and control key handling

1 files changed, 36 insertions, 2 deletions

diff --git a/ttwhy/terminal/events.cppm b/ttwhy/terminal/events.cppm
index ce4a7d5..5df397d 100644
--- a/ttwhy/terminal/events.cppm
+++ b/ttwhy/terminal/events.cppm
@@ -34,6 +34,31 @@ export namespace ttwhy::terminal
     page_down,
   };
 
+  //! Represents terminal function keys (F1 through F20).
+  enum struct function_key : std::uint8_t
+  {
+    f1,
+    f2,
+    f3,
+    f4,
+    f5,
+    f6,
+    f7,
+    f8,
+    f9,
+    f10,
+    f11,
+    f12,
+    f13,
+    f14,
+    f15,
+    f16,
+    f17,
+    f18,
+    f19,
+    f20,
+  };
+
   //! Represents individual keyboard modifier keys.
   enum struct modifier : std::uint8_t
   {
@@ -138,14 +163,23 @@ export namespace ttwhy::terminal
     char key{};
   };
 
+  //! Represents a terminal function key event.
+  struct function_key_event
+  {
+    function_key key{};
+    modifier_set modifiers{};
+  };
+
   //! Variant representing any input event produced by a terminal scanner.
-  using input_event = std::variant<character_event, control_event, navigation_event, ctrl_chord_event>;
+  using input_event =
+      std::variant<character_event, control_event, navigation_event, ctrl_chord_event, function_key_event>;
 
   //! Validates that a sink can receive all terminal input event types.
   //!
   //! @tparam Sink The sink callable type to validate.
   template<typename Sink>
   concept event_sink = ttwhy::event_sink<Sink, character_event> && ttwhy::event_sink<Sink, control_event> &&
-                       ttwhy::event_sink<Sink, navigation_event>;
+                       ttwhy::event_sink<Sink, navigation_event> && ttwhy::event_sink<Sink, ctrl_chord_event> &&
+                       ttwhy::event_sink<Sink, function_key_event>;
 
 }  // namespace ttwhy::terminal