7 files changed, 68 insertions, 6 deletions
diff --git a/src/input/include/input_device.hpp b/src/input/include/input_device.hpp
index 59456351..d944c3bf 100644
--- a/src/input/include/input_device.hpp
+++ b/src/input/include/input_device.hpp
@@ -29,7 +29,9 @@ class IInputDevice {
   virtual auto read(lv_indev_data_t* data) -> void = 0;
 
   virtual auto name() -> std::string = 0;
-  virtual auto hooks() -> std::vector<TriggerHooks> { return {}; }
+  virtual auto triggers() -> std::vector<std::reference_wrapper<TriggerHooks>> {
+    return {};
+  }
 };
 
 }  // namespace input
diff --git a/src/input/include/input_hook.hpp b/src/input/include/input_hook.hpp
index 81eb80d9..a257c04a 100644
--- a/src/input/include/input_hook.hpp
+++ b/src/input/include/input_hook.hpp
@@ -32,6 +32,10 @@ class Hook {
   auto name() const -> const std::string& { return name_; }
   auto callback() -> std::optional<HookCallback>;
 
+  // Not copyable or movable.
+  Hook(const Hook&) = delete;
+  Hook& operator=(const Hook&) = delete;
+
  private:
   std::string name_;
   std::optional<HookCallback> default_;
@@ -51,7 +55,11 @@ class TriggerHooks {
   auto override(Trigger::State, std::optional<HookCallback>) -> void;
 
   auto name() const -> const std::string&;
-  auto pushHooks(lua_State*) -> void;
+  auto hooks() -> std::vector<std::reference_wrapper<Hook>>;
+
+  // Not copyable or movable.
+  TriggerHooks(const TriggerHooks&) = delete;
+  TriggerHooks& operator=(const TriggerHooks&) = delete;
 
  private:
   std::string name_;
diff --git a/src/input/include/input_nav_buttons.hpp b/src/input/include/input_nav_buttons.hpp
index 4e4952c9..9feeb375 100644
--- a/src/input/include/input_nav_buttons.hpp
+++ b/src/input/include/input_nav_buttons.hpp
@@ -26,7 +26,7 @@ class NavButtons : public IInputDevice {
   auto read(lv_indev_data_t* data) -> void override;
 
   auto name() -> std::string override;
-  auto hooks() -> std::vector<TriggerHooks> override;
+  auto triggers() -> std::vector<std::reference_wrapper<TriggerHooks>> override;
 
  private:
   drivers::IGpios& gpios_;
diff --git a/src/input/include/input_touch_dpad.hpp b/src/input/include/input_touch_dpad.hpp
index 691e3243..0c45b2d9 100644
--- a/src/input/include/input_touch_dpad.hpp
+++ b/src/input/include/input_touch_dpad.hpp
@@ -25,7 +25,7 @@ class TouchDPad : public IInputDevice {
   auto read(lv_indev_data_t* data) -> void override;
 
   auto name() -> std::string override;
-  auto hooks() -> std::vector<TriggerHooks> override;
+  auto triggers() -> std::vector<std::reference_wrapper<TriggerHooks>> override;
 
  private:
   drivers::TouchWheel& wheel_;
diff --git a/src/input/include/input_touch_wheel.hpp b/src/input/include/input_touch_wheel.hpp
index 1f116da9..764cc68d 100644
--- a/src/input/include/input_touch_wheel.hpp
+++ b/src/input/include/input_touch_wheel.hpp
@@ -28,7 +28,7 @@ class TouchWheel : public IInputDevice {
   auto read(lv_indev_data_t* data) -> void override;
 
   auto name() -> std::string override;
-  auto hooks() -> std::vector<TriggerHooks> override;
+  auto triggers() -> std::vector<std::reference_wrapper<TriggerHooks>> override;
 
   auto sensitivity() -> lua::Property&;
 
diff --git a/src/input/include/input_volume_buttons.hpp b/src/input/include/input_volume_buttons.hpp
index a684aa48..e3246df4 100644
--- a/src/input/include/input_volume_buttons.hpp
+++ b/src/input/include/input_volume_buttons.hpp
@@ -25,7 +25,7 @@ class VolumeButtons : public IInputDevice {
   auto read(lv_indev_data_t* data) -> void override;
 
   auto name() -> std::string override;
-  auto hooks() -> std::vector<TriggerHooks> override;
+  auto triggers() -> std::vector<std::reference_wrapper<TriggerHooks>> override;
 
  private:
   drivers::IGpios& gpios_;
diff --git a/src/input/include/lvgl_input_driver.hpp b/src/input/include/lvgl_input_driver.hpp
index 9f43d27f..9adaf143 100644
--- a/src/input/include/lvgl_input_driver.hpp
+++ b/src/input/include/lvgl_input_driver.hpp
@@ -18,6 +18,8 @@
 #include "hal/lv_hal_indev.h"
 
 #include "input_device.hpp"
+#include "input_hook.hpp"
+#include "lua_thread.hpp"
 #include "nvs.hpp"
 #include "property.hpp"
 #include "touchwheel.hpp"
@@ -54,6 +56,56 @@ class LvglInputDriver {
   std::vector<std::shared_ptr<IInputDevice>> inputs_;
   std::vector<std::shared_ptr<IFeedbackDevice>> feedbacks_;
 
+  /*
+   * Key for identifying which device, trigger, and specific hook are being
+   * overriden by Lua.
+   */
+  struct OverrideSelector {
+    std::string device_name;
+    std::string trigger_name;
+    std::string hook_name;
+
+    friend bool operator<(const OverrideSelector& l,
+                          const OverrideSelector& r) {
+      return std::tie(l.device_name, l.trigger_name, l.hook_name) <
+             std::tie(r.device_name, r.trigger_name, r.hook_name);
+    }
+  };
+
+  /* Userdata object for tracking the Lua mirror of a TriggerHooks object. */
+  class LuaTrigger {
+   public:
+    LuaTrigger(LvglInputDriver&, IInputDevice&, TriggerHooks&);
+
+    static auto get(lua_State*, int idx) -> LuaTrigger&;
+    static auto luaGc(lua_State*) -> int;
+    static auto luaToString(lua_State*) -> int;
+    static auto luaNewIndex(lua_State*) -> int;
+
+    static constexpr struct luaL_Reg kFuncs[] = {{"__gc", luaGc},
+                                                 {"__tostring", luaToString},
+                                                 {"__newindex", luaNewIndex},
+                                                 {NULL, NULL}};
+
+   private:
+    LvglInputDriver* driver_;
+
+    std::string device_;
+    std::string trigger_;
+    std::map<std::string, std::string> hooks_;
+  };
+
+  /* A hook override implemented as a lua callback */
+  struct LuaOverride {
+    lua_State* L;
+    int ref;
+  };
+
+  std::map<OverrideSelector, LuaOverride> overrides_;
+
+  auto setOverride(lua_State* L, const OverrideSelector&) -> void;
+  auto applyOverride(const OverrideSelector&, LuaOverride&) -> void;
+
   bool is_locked_;
 };