Implement RemapButton feature

Many changes were made here, too many to list here.

src/logid/InputDevice.cpp

@@ -0,0 +1,107 @@
+/*
+ * Copyright 2019-2020 PixlOne
+ *
+ * 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 <http://www.gnu.org/licenses/>.
+ *
+ */
+
+#include <system_error>
+#include <utility>
+
+#include "InputDevice.h"
+
+extern "C"
+{
+#include <libevdev/libevdev.h>
+#include <libevdev/libevdev-uinput.h>
+};
+
+using namespace logid;
+
+InputDevice::InvalidEventCode::InvalidEventCode(std::string name)
+{
+    _what = "Invalid event code " + name;
+}
+
+const char* InputDevice::InvalidEventCode::what() const noexcept
+{
+    return _what.c_str();
+}
+
+InputDevice::InputDevice(const char* name)
+{
+    device = libevdev_new();
+    libevdev_set_name(device, name);
+
+    ///TODO: Is it really a good idea to enable all events?
+    libevdev_enable_event_type(device, EV_KEY);
+    for(int i = 0; i < KEY_CNT; i++)
+        libevdev_enable_event_code(device, EV_KEY, i, nullptr);
+    libevdev_enable_event_type(device, EV_REL);
+    for(int i = 0; i < REL_CNT; i++)
+        libevdev_enable_event_code(device, EV_REL, i, nullptr);
+
+    int err = libevdev_uinput_create_from_device(device,
+            LIBEVDEV_UINPUT_OPEN_MANAGED, &ui_device);
+
+    if(err != 0)
+        throw std::system_error(-err, std::generic_category());
+}
+
+InputDevice::~InputDevice()
+{
+    libevdev_uinput_destroy(ui_device);
+    libevdev_free(device);
+}
+
+void InputDevice::moveAxis(uint axis, int movement)
+{
+    _sendEvent(EV_REL, axis, movement);
+}
+
+void InputDevice::pressKey(uint code)
+{
+    _sendEvent(EV_KEY, code, 1);
+}
+
+void InputDevice::releaseKey(uint code)
+{
+    _sendEvent(EV_KEY, code, 0);
+}
+
+uint InputDevice::toKeyCode(std::string name)
+{
+    return _toEventCode(EV_KEY, std::move(name));
+}
+
+uint InputDevice::toAxisCode(std::string name)
+{
+    return _toEventCode(EV_KEY, std::move(name));
+}
+
+uint InputDevice::_toEventCode(uint type, const std::string& name)
+{
+    int code = libevdev_event_code_from_name(type, name.c_str());
+
+    if(code == -1)
+        throw InvalidEventCode(name);
+
+    return code;
+}
+
+void InputDevice::_sendEvent(uint type, uint code, int value)
+{
+    libevdev_uinput_write_event(ui_device, type, code, value);
+    libevdev_uinput_write_event(ui_device, EV_SYN, SYN_REPORT, 0);
+}