qmk_firmware/keyboards/jm60/keymaps/poker3/keymap.c

#include QMK_KEYBOARD_H

// Used for SHIFT_ESC
#define MODS_CTRL_MASK  (MOD_BIT(KC_LSHIFT)|MOD_BIT(KC_RSHIFT))

// Each layer gets a name for readability, which is then used in the keymap matrix below.
// The underscores don't mean anything - you can have a layer called STUFF or any other name.
// Layer names don't all need to be of the same length, obviously, and you can also skip them
// entirely and just use numbers.
#define _BL 0
#define _FL 1

#define _______ KC_TRNS

const uint16_t PROGMEM keymaps[][MATRIX_ROWS][MATRIX_COLS] = {
  /* Keymap _BL: (Base Layer) Default Layer
   */
[_BL] = KEYMAP_ANSI(
  F(0),    KC_1,   KC_2,   KC_3,   KC_4,   KC_5,   KC_6,   KC_7,   KC_8,   KC_9,   KC_0,   KC_MINS, KC_EQL, KC_BSPC, \
  KC_TAB,  KC_Q,   KC_W,   KC_E,   KC_R,   KC_T,   KC_Y,   KC_U,   KC_I,   KC_O,   KC_P,   KC_LBRC, KC_RBRC,KC_BSLS, \
  MO(_FL), KC_A,   KC_S,   KC_D,   KC_F,   KC_G,   KC_H,   KC_J,   KC_K,   KC_L,   KC_SCLN,KC_QUOT,         KC_ENT,  \
  KC_LSFT,         KC_Z,   KC_X,   KC_C,   KC_V,   KC_B,   KC_N,   KC_M,   KC_COMM,KC_DOT, KC_SLSH,         KC_RSFT, \
  KC_LCTL, KC_LGUI,KC_LALT,                KC_SPC,                                 KC_RALT,KC_RGUI, MO(_FL),KC_RCTL),

  /* Keymap _FL: Function Layer
   */
[_FL] = KEYMAP_ANSI(
  KC_GRV, KC_F1,KC_F2,KC_F3,KC_F4,KC_F5,KC_F6,KC_F7,KC_F8,KC_F9,KC_F10,KC_F11,KC_F12,KC_DEL,  \
  _______,KC_MPRV,KC_MPLY,KC_MNXT,_______,_______,_______,KC_PGUP,KC_UP,KC_PGDN,KC_PSCR, KC_SLCK, KC_PAUS,_______, \
  KC_CAPS,_______,KC_VOLD,KC_VOLU,KC_MUTE,_______,KC_HOME,KC_LEFT,KC_DOWN,KC_RGHT,KC_INS,KC_DEL,_______, \
  _______,KC_APP,_______,_______,_______,_______,KC_END,_______,_______,_______,_______,_______, \
  _______,_______,_______,                _______,                        _______,_______,_______,_______),
};

enum function_id {
    SHIFT_ESC,
};

const uint16_t PROGMEM fn_actions[] = {
  [0]  = ACTION_FUNCTION(SHIFT_ESC),
};

void action_function(keyrecord_t *record, uint8_t id, uint8_t opt) {
  static uint8_t shift_esc_shift_mask;
  switch (id) {
    case SHIFT_ESC:
      shift_esc_shift_mask = get_mods()&MODS_CTRL_MASK;
      if (record->event.pressed) {
        if (shift_esc_shift_mask) {
          add_key(KC_GRV);
          send_keyboard_report();
        } else {
          add_key(KC_ESC);
          send_keyboard_report();
        }
      } else {
        if (shift_esc_shift_mask) {
          del_key(KC_GRV);
          send_keyboard_report();
        } else {
          del_key(KC_ESC);
          send_keyboard_report();
        }
      }
      break;
  }
}