#include <Keyboard.h>

#define LAYOUT 3
const int l_Pin   = 10;
const int r_Pin   = A1;
const int led_Pin = 13;

#if LAYOUT == 1     /* Gaming */
const int l_Key[] = { 's' };
const int r_Key[] = { 'w' };
#elif LAYOUT == 2   /* Vim */
const int l_Key[] = { KEY_LEFT_CTRL };
const int r_Key[] = { KEY_ESC };
#else               /* Windows Virtual Desktop */
const int l_Key[] = { KEY_LEFT_GUI, KEY_LEFT_CTRL, KEY_LEFT_ARROW };
const int r_Key[] = { KEY_LEFT_GUI, KEY_LEFT_CTRL, KEY_RIGHT_ARROW };
#endif

void setup()
{
    pinMode(l_Pin, INPUT_PULLUP);
    pinMode(r_Pin, INPUT_PULLUP);
    pinMode(led_Pin, OUTPUT);

    Keyboard.begin();
    digitalWrite(led_Pin, HIGH);
}

void loop()
{
    if (!digitalRead(l_Pin))
        for (auto k : l_Key)
            Keyboard.press(k);
    else
        for (auto k : l_Key)
            Keyboard.release(k);
    if (!digitalRead(r_Pin))
        for (auto k : r_Key)
            Keyboard.press(k);
    else
        for (auto k : r_Key)
            Keyboard.release(k);
}