lib: prepare for state machine

3 files changed, 60 insertions, 1 deletions

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 316b655..b50768a 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -14,7 +14,15 @@ FetchContent_Declare("asio"
   GIT_TAG "asio-1-38-0"
 )
 
-FetchContent_MakeAvailable("asio")
+FetchContent_Declare("sml"
+  GIT_REPOSITORY "https://github.com/boost-ext/sml"
+  GIT_TAG "v1.2.0"
+)
+
+FetchContent_MakeAvailable(
+  "asio"
+  "sml"
+)
 
 ### asio
 
@@ -40,6 +48,7 @@ target_sources("ttwhy-core" PUBLIC
   FILE_SET CXX_MODULES
   FILES
 
+  "ttwhy/event.cppm"
   "ttwhy/io.cppm"
   "ttwhy/lib.cppm"
   "ttwhy/scoped_attributes.cppm"
@@ -55,6 +64,7 @@ target_compile_features("ttwhy-core" PUBLIC
 
 target_link_libraries("ttwhy-core" PUBLIC
   "ext::asio"
+  "sml::sml"
 )
 
 target_compile_options("ttwhy-core" PUBLIC
diff --git a/ttwhy/event.cppm b/ttwhy/event.cppm
new file mode 100644
index 0000000..3a81bff
--- /dev/null
+++ b/ttwhy/event.cppm
@@ -0,0 +1,48 @@
+module;
+
+#include <variant>
+
+export module ttwhy:event;
+
+namespace ttwhy
+{
+  export enum class control_key
+  {
+    del,
+    enter,
+    escape,
+    tab,
+    backspace,
+  };
+
+  export enum class navigation_key
+  {
+    up,
+    down,
+    left,
+    right,
+    home,
+    end,
+    delete_key,
+    insert_key,
+    page_up,
+    page_down,
+  };
+
+  export struct character_event
+  {
+    char value;
+  };
+
+  export struct control_event
+  {
+    control_key key;
+  };
+
+  export struct navigation_event
+  {
+    navigation_key key;
+  };
+
+  export using input_event = std::variant<character_event, control_event, navigation_event>;
+}  // namespace ttwhy
diff --git a/ttwhy/lib.cppm b/ttwhy/lib.cppm
index 14e0d5c..b7766bd 100644
--- a/ttwhy/lib.cppm
+++ b/ttwhy/lib.cppm
@@ -1,4 +1,5 @@
 export module ttwhy;
 
+export import :event;
 export import :io;
 export import :scoped_attributes;