Pass cursor move event to the script

Set initial window scale to 0 because wayland freezes the process when it's not >0.
Provide more information from `llua_mouse_hook` about why the callback is failing.
Prevent call to `llua_init` when provided lua_load script doesn't exist.
- This caused me a headache and now lua_L won't be initialized if the
  script doesn't exist. This prevents a missing file from causing later
  issues which might be harder to catch.
Feature gated X11 in mouse-events.h/.cc files.

Signed-off-by: Tin <tin.svagelj@live.com>

src/display-wayland.cc

@@ -61,6 +61,9 @@
 #ifdef BUILD_WAYLAND
 #include "fonts.h"
 #endif
+#ifdef BUILD_MOUSE_EVENTS
+#include "mouse-events.h"
+#endif
 
 #pragma GCC diagnostic ignored "-Wunused-parameter"
 
@@ -423,6 +426,7 @@ void window_layer_surface_set_size(struct window *window) {
                                  global_window->rectangle.height);
 }
 
+#ifdef BUILD_MOUSE_EVENTS
 static void on_pointer_enter(void *data, wl_pointer *pointer, uint32_t serial,
               wl_surface *surface, wl_fixed_t sx,
               wl_fixed_t sy) {
@@ -441,10 +445,32 @@ static void on_pointer_motion(void *data,
 		       uint32_t time,
 		       wl_fixed_t surface_x,
 		       wl_fixed_t surface_y) {
-  DBGP("POINTER MOTIONED! WOAH!");
+  window *w = reinterpret_cast<struct window *>(data);
+  size_t x = surface_x;
+  size_t y = surface_y;
+  size_t abs_x = w->rectangle.x + x;
+  size_t abs_y = w->rectangle.y + y;
+  mouse_move_event event {
+    mouse_event_type::MOUSE_MOVE,
+    time,
+    x,
+    y,
+    abs_x,
+    abs_y
+  };
+  llua_mouse_hook(event);
 }
 
-static void seat_capability_listener (void *data, wl_seat *seat, std::uint32_t capability_int) {
+static void on_pointer_button(void *data,
+		       struct wl_pointer *wl_pointer,
+		       uint32_t serial,
+		       uint32_t time,
+		       uint32_t button,
+		       uint32_t state) {
+  
+}
+
+static void seat_capability_listener (void *data, wl_seat *seat, uint32_t capability_int) {
   wl_seat_capability capabilities = static_cast<wl_seat_capability>(capability_int);
   if (wl_globals.seat == seat) {
     if ((capabilities & WL_SEAT_CAPABILITY_POINTER) > 0) {
@@ -454,12 +480,14 @@ static void seat_capability_listener (void *data, wl_seat *seat, std::uint32_t c
         .enter = on_pointer_enter,
         .leave = on_pointer_leave,
         .motion = on_pointer_motion,
+        .button = on_pointer_button,
       };
-      DBGP("ADDED A LISTENER");
-      wl_pointer_add_listener(wl_globals.pointer, &listener, NULL);
+      wl_pointer_add_listener(wl_globals.pointer, &listener, data);
     }
   }
 }
+static void seat_name_listener(void *data, struct wl_seat *wl_seat, const char *name) {}
+#endif /* BUILD_MOUSE_EVENTS */
 
 bool display_output_wayland::initialize() {
   epoll_fd = epoll_create1(0);
@@ -490,6 +518,15 @@ bool display_output_wayland::initialize() {
   zwlr_layer_surface_v1_add_listener(global_window->layer_surface,
                                      &layer_surface_listener, nullptr);
 
+  #ifdef BUILD_MOUSE_EVENTS
+  wl_seat_listener listener {
+    .capabilities = seat_capability_listener,
+    .name = seat_name_listener,
+  };
+  wl_seat_add_listener(wl_globals.seat, &listener, global_window);
+  #endif /* BUILD_MOUSE_EVENTS */
+
+  wl_surface_set_buffer_scale(global_window->surface, global_window->scale);
   wl_surface_commit(global_window->surface);
   wl_display_roundtrip(global_display);
   wayland_create_window();
@@ -1123,7 +1160,7 @@ struct window *window_create(struct wl_surface *surface, struct wl_shm *shm,
   window->rectangle.y = 0;
   window->rectangle.width = width;
   window->rectangle.height = height;
-  window->scale = 0;
+  window->scale = 1;
   window->pending_scale = 1;
 
   window->surface = surface;

src/display-x11.cc

@@ -44,7 +44,7 @@
 #endif /* BUILD_IMLIB2 */
 #ifdef BUILD_MOUSE_EVENTS
 #include "mouse-events.h"
-#endif
+#endif /* BUILD_MOUSE_EVENTS */
 #endif /* BUILD_X11 */
 
 #include <iostream>

src/llua.cc

@@ -54,6 +54,9 @@ void llua_rm_notifies(void);
 static int llua_block_notify = 0;
 #endif /* HAVE_SYS_INOTIFY_H */
 
+// POSIX compliant
+#include <sys/stat.h>
+
 static void llua_load(const char *script);
 
 lua_State *lua_L = nullptr;
@@ -207,9 +210,21 @@ void llua_init() {
 #endif /* BUILD_X11 */
 }
 
+inline bool file_exists (const char *path) {
+  struct stat buffer;   
+  return (stat (path, &buffer) == 0); 
+}
+
 void llua_load(const char *script) {
   int error;
 
+  if (!file_exists(script)) {
+    NORM_ERR("llua_load: specified script file '%s' doesn't exist", script);
+    // return without initializing lua_L because other parts of the code rely
+    // on it being null if the script is not loaded
+    return;
+  }
+
   llua_init();
 
   std::string path = to_real_path(script);
@@ -501,13 +516,20 @@ bool llua_mouse_hook(const EventT &ev) {
     return false;
   }
   const std::string func = lua_mouse_hook.get(*state);
-  lua_getglobal(lua_L, lua_mouse_hook.get(*state).c_str());
+  int ty = lua_getglobal(lua_L, lua_mouse_hook.get(*state).c_str());
+  if (ty == LUA_TNIL) {
+    NORM_ERR("llua_mouse_hook: hook %s is not defined", func.c_str());
+    return false;
+  } else if (ty != LUA_TFUNCTION) {
+    NORM_ERR("llua_mouse_hook: hook %s is not a function", func.c_str());
+    return false;
+  }
 
   ev.push_lua_table(lua_L);
 
   bool result = false;
   if (lua_pcall(lua_L, 1, 1, 0) != 0) {
-    NORM_ERR("llua_mouse_hook: function %s execution failed: %s", func.c_str(),
+    NORM_ERR("llua_mouse_hook: hook %s execution failed: %s", func.c_str(),
              lua_tostring(lua_L, -1));
     lua_pop(lua_L, 1);
   } else {

src/mouse-events.cc

@@ -22,7 +22,10 @@
 
 #include <array>
 #include <string>
+
+#ifdef BUILD_X11
 #include "X11/Xlib.h"
+#endif /* BUILD_X11 */
 
 std::string event_type_to_str(int type) {
   switch (type) {
@@ -122,6 +125,7 @@ void mouse_positioned_event::push_lua_data(lua_State *L) const {
   push_table_value(L, "time", this->time);
 }
 
+#ifdef BUILD_X11
 mouse_move_event::mouse_move_event(XMotionEvent *ev) {
   this->type = MOUSE_MOVE;
   this->x = ev->x;
@@ -130,12 +134,14 @@ mouse_move_event::mouse_move_event(XMotionEvent *ev) {
   this->y_abs = ev->y_root;
   this->time = ev->time;
 }
+#endif /* BUILD_X11 */
 
 void mouse_move_event::push_lua_data(lua_State *L) const {
   mouse_positioned_event::push_lua_data(L);
   push_mods(L, this->mods);
 }
 
+#ifdef BUILD_X11
 mouse_scroll_event::mouse_scroll_event(XButtonEvent *ev) {
   this->type = MOUSE_SCROLL;
   this->x = ev->x;
@@ -146,6 +152,7 @@ mouse_scroll_event::mouse_scroll_event(XButtonEvent *ev) {
   this->mods = ev->state;
   this->up = ev->button == 4;
 }
+#endif /* BUILD_X11 */
 
 void mouse_scroll_event::push_lua_data(lua_State *L) const {
   mouse_positioned_event::push_lua_data(L);
@@ -153,6 +160,7 @@ void mouse_scroll_event::push_lua_data(lua_State *L) const {
   push_mods(L, this->mods);
 }
 
+#ifdef BUILD_X11
 mouse_button_event::mouse_button_event(XButtonEvent *ev) {
   this->type = ev->type == ButtonPress ? MOUSE_DOWN : MOUSE_UP;
   this->x = ev->x;
@@ -163,6 +171,7 @@ mouse_button_event::mouse_button_event(XButtonEvent *ev) {
   this->mods = ev->state;
   this->button = ev->button;
 }
+#endif /* BUILD_X11 */
 
 void mouse_button_event::push_lua_data(lua_State *L) const {
   mouse_positioned_event::push_lua_data(L);
@@ -170,6 +179,7 @@ void mouse_button_event::push_lua_data(lua_State *L) const {
   push_mods(L, this->mods);
 }
 
+#ifdef BUILD_X11
 mouse_crossing_event::mouse_crossing_event(XCrossingEvent *ev) {
   this->type = ev->type == EnterNotify ? AREA_ENTER : AREA_LEAVE;
   this->x = ev->x;
@@ -178,3 +188,4 @@ mouse_crossing_event::mouse_crossing_event(XCrossingEvent *ev) {
   this->y_abs = ev->y_root;
   this->time = ev->time;
 }
+#endif /* BUILD_X11 */

src/mouse-events.h

@@ -25,10 +25,12 @@
 #include <cstdint>
 
 extern "C" {
+#ifdef BUILD_X11
 #pragma GCC diagnostic push
 #pragma GCC diagnostic ignored "-Wvariadic-macros"
 #include <X11/Xlib.h>
 #pragma GCC diagnostic pop
+#endif /* BUILD_X11 */
 #include <lua.h>
 }
 
@@ -46,14 +48,18 @@ struct mouse_event {
   mouse_event_type type;
   uint64_t time = 0L;  // event time
 
+  mouse_event(mouse_event_type type, uint64_t time): type(type), time(time) {};
+
   void push_lua_table(lua_State *L) const;
 
   virtual void push_lua_data(lua_State *L) const = 0;
 };
 
 struct mouse_positioned_event : public mouse_event {
-  int x = 0, y = 0;          // positions relative to window
-  int x_abs = 0, y_abs = 0;  // positions relative to root
+  size_t x = 0, y = 0;          // positions relative to window
+  size_t x_abs = 0, y_abs = 0;  // positions relative to root
+
+  mouse_positioned_event(mouse_event_type type, uint64_t time, size_t x, size_t y, size_t x_abs, size_t y_abs): mouse_event{type, time}, x(x), y(y), x_abs(x_abs), y_abs() {};
   
   void push_lua_data(lua_State *L) const;
 };
@@ -61,7 +67,10 @@ struct mouse_positioned_event : public mouse_event {
 struct mouse_move_event : public mouse_positioned_event {
   std::bitset<13> mods;  // held buttons and modifiers (ctrl, shift, ...)
 
+  explicit mouse_move_event(mouse_event_type type, uint64_t time, size_t x, size_t y, size_t x_abs, size_t y_abs, std::bitset<13> mods = 0): mouse_positioned_event{type, time, x, y, x_abs, y_abs}, mods(mods) {};
+  #ifdef BUILD_X11
   explicit mouse_move_event(XMotionEvent *ev);
+  #endif /* BUILD_X11 */
 
   void push_lua_data(lua_State *L) const;
 };
@@ -70,7 +79,9 @@ struct mouse_scroll_event : public mouse_positioned_event {
   std::bitset<13> mods;  // held buttons and modifiers (ctrl, shift, ...)
   bool up = false;
 
+  #ifdef BUILD_X11
   explicit mouse_scroll_event(XButtonEvent *ev);
+  #endif /* BUILD_X11 */
 
   void push_lua_data(lua_State *L) const;
 };
@@ -79,7 +90,9 @@ struct mouse_button_event : public mouse_positioned_event {
   std::bitset<13> mods;  // held buttons and modifiers (ctrl, shift, ...)
   uint button = 0;
 
+  #ifdef BUILD_X11
   explicit mouse_button_event(XButtonEvent *ev);
+  #endif /* BUILD_X11 */
 
   void push_lua_data(lua_State *L) const;
 };
@@ -88,7 +101,9 @@ typedef struct mouse_button_event mouse_press_event;
 typedef struct mouse_button_event mouse_release_event;
 
 struct mouse_crossing_event : public mouse_positioned_event {
+  #ifdef BUILD_X11
   explicit mouse_crossing_event(XCrossingEvent *ev);
+  #endif /* BUILD_X11 */
 };
 
 typedef struct mouse_crossing_event mouse_enter_event;