conky/src/mouse-events.cc

/*
 * mouse_events.cc: conky support for mouse events
 *
 * Copyright (C) 2020 Tin Svagelj tin.svagelj@live.com
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <https://www.gnu.org/licenses/>.
 *
 */

#include "mouse-events.h"

#include <array>
#include <ctime>
#include <string>
#include <type_traits>

#include "logging.h"

extern "C" {
#include <lua.h>
}

namespace conky {

/* Lua helper functions */
void push_table_value(lua_State *L, std::string key, std::string value) {
  lua_pushstring(L, key.c_str());
  lua_pushstring(L, value.c_str());
  lua_settable(L, -3);
}

template <typename T>
typename std::enable_if<std::is_integral<T>::value>::type push_table_value(
    lua_State *L, std::string key, T value) {
  lua_pushstring(L, key.c_str());
  lua_pushinteger(L, value);
  lua_settable(L, -3);
}

template <typename T>
typename std::enable_if<std::is_floating_point<T>::value>::type
push_table_value(lua_State *L, std::string key, T value) {
  lua_pushstring(L, key.c_str());
  lua_pushnumber(L, value);
  lua_settable(L, -3);
}

void push_table_value(lua_State *L, std::string key, bool value) {
  lua_pushstring(L, key.c_str());
  lua_pushboolean(L, value);
  lua_settable(L, -3);
}

template <std::size_t N>
void push_bitset(lua_State *L, std::bitset<N> it,
                 std::array<std::string, N> labels) {
  lua_newtable(L);
  for (std::size_t i = 0; i < N; i++)
    push_table_value(L, labels[i], it.test(i));
}

const std::array<std::string, 6> mod_names = {{
    "shift",
    "control",
    "alt",
    "super",
    "caps_lock",
    "num_lock",
}};

void push_mods(lua_State *L, modifier_state_t mods) {
  lua_pushstring(L, "mods");
  push_bitset(L, mods, mod_names);
  lua_settable(L, -3);
}

// Returns ms since Epoch.
inline std::size_t current_time_ms() {
  struct timespec spec;
  clock_gettime(CLOCK_REALTIME, &spec);
  return static_cast<std::size_t>(static_cast<std::uint64_t>(spec.tv_sec) *
                                      1'000 +
                                  spec.tv_nsec / 1'000'000);
}

void push_table_value(lua_State *L, std::string key, mouse_event_t type) {
  lua_pushstring(L, key.c_str());
  switch (type) {
    case MOUSE_PRESS:
      lua_pushstring(L, "button_down");
      break;
    case MOUSE_RELEASE:
      lua_pushstring(L, "button_up");
      break;
    case MOUSE_SCROLL:
      lua_pushstring(L, "mouse_scroll");
      break;
    case MOUSE_MOVE:
      lua_pushstring(L, "mouse_move");
      break;
    case AREA_ENTER:
      lua_pushstring(L, "mouse_enter");
      break;
    case AREA_LEAVE:
      lua_pushstring(L, "mouse_leave");
      break;
    default:
      lua_pushnil(L);
      break;
  }
  lua_settable(L, -3);
}

void push_table_value(lua_State *L, std::string key,
                      scroll_direction_t direction) {
  lua_pushstring(L, key.c_str());
  switch (direction) {
    case SCROLL_DOWN:
      lua_pushstring(L, "down");
      break;
    case SCROLL_UP:
      lua_pushstring(L, "up");
      break;
    case SCROLL_LEFT:
      lua_pushstring(L, "left");
      break;
    case SCROLL_RIGHT:
      lua_pushstring(L, "right");
      break;
    default:
      lua_pushnil(L);
      break;
  }
  lua_settable(L, -3);
}

void push_table_value(lua_State *L, std::string key, mouse_button_t button) {
  lua_pushstring(L, key.c_str());
  switch (button) {
    case BUTTON_LEFT:
      lua_pushstring(L, "left");
      break;
    case BUTTON_RIGHT:
      lua_pushstring(L, "right");
      break;
    case BUTTON_MIDDLE:
      lua_pushstring(L, "middle");
      break;
    case BUTTON_BACK:
      lua_pushstring(L, "back");
      break;
    case BUTTON_FORWARD:
      lua_pushstring(L, "forward");
      break;
    default:
      lua_pushnil(L);
      break;
  }
  lua_settable(L, -3);
}

/* Class methods */
mouse_event::mouse_event(mouse_event_t type)
    : type(type), time(current_time_ms()){};

void mouse_event::push_lua_table(lua_State *L) const {
  lua_newtable(L);
  push_table_value(L, "type", this->type);
  push_table_value(L, "time", this->time);
  push_lua_data(L);
}

void mouse_positioned_event::push_lua_data(lua_State *L) const {
  push_table_value(L, "x", this->x);
  push_table_value(L, "y", this->y);
  push_table_value(L, "x_abs", this->x_abs);
  push_table_value(L, "y_abs", this->y_abs);
}

void mouse_move_event::push_lua_data(lua_State *L) const {
  mouse_positioned_event::push_lua_data(L);
  push_mods(L, this->mods);
}

void mouse_scroll_event::push_lua_data(lua_State *L) const {
  mouse_positioned_event::push_lua_data(L);
  push_table_value(L, "direction", this->direction);
  push_mods(L, this->mods);
}

void mouse_button_event::push_lua_data(lua_State *L) const {
  mouse_positioned_event::push_lua_data(L);
  push_table_value(L, "button_code", static_cast<std::uint32_t>(this->button));
  push_table_value(L, "button", this->button);
  push_mods(L, this->mods);
}

}  // namespace conky