qmk_firmware_custom/keyboards/dz60/keymaps/iso_vim_arrow/keymap.c

#include QMK_KEYBOARD_H

#define MODS_CTRL_MASK  (MOD_BIT(KC_LSHIFT)|MOD_BIT(KC_RSHIFT))

const uint16_t PROGMEM keymaps[][MATRIX_ROWS][MATRIX_COLS] = {
/* ISO VIM arrow
* ,-----------------------------------------------------------------------------------------.
* | Esc |  1  |  2  |  3  |  4  |  5  |  6  |  7  |  8  |  9  |  0  |  ß  |  ´  |   BSPC    |
* |-----------------------------------------------------------------------------------------+
* | Tab    |  Q  |  W  |  E  |  R  |  T  |  Z  |  U  |  I  |  O  |  P  |  P  |  Ü  | *  |   |
* |-------------------------------------------------------------------------------------|   +
* | Layer_1    |  A  |  S  |  D  |  F  |  G  |  H  |  J  |  K  |  L  |  Ö  |  Ä |  # |Enter |
* |-----------------------------------------------------------------------------------------+
* | Shift|  < |  Y  |  X  |  C  |  V  |  B  |  N  |  M  |  ,  |  .  |  .  |  -  |  RShift   |
* |-----------------------------------------------------------------------------------------+
* | LCtrl |  LGUI  |  LAlt  |          Space           |  RAlt | Left |  Down | Up  | Right |
* `-----------------------------------------------------------------------------------------'
*/
	LAYOUT(
		KC_ESC, 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_NO, 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(1), 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_NUBS, KC_Z, KC_X, KC_C, KC_V, KC_B, KC_N, KC_M, KC_COMM, KC_DOT, KC_SLSH, KC_RSFT, KC_NO,
    KC_LCTL, KC_LGUI, KC_LALT, KC_SPC, KC_SPC, KC_SPC, KC_RALT, KC_LEFT, KC_DOWN, KC_UP, KC_RIGHT),


	LAYOUT(
		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_NO, KC_DEL,
		KC_NO, KC_NO, KC_NO, KC_NO, RESET, KC_NO, KC_HOME, KC_PGDN, KC_PGUP, KC_END, KC_PSCR, KC_NO, KC_NO, KC_NO,
		KC_NO, KC_NO, KC_NO, KC_NO, KC_NO, KC_NO, KC_LEFT, KC_DOWN, KC_UP, KC_RIGHT, KC_END, KC_DEL, KC_NO,
		KC_LSFT, BL_TOGG, KC_APP, KC_PAUS, KC_INS, KC_NO, KC_MPLY, KC_MSTP, KC_MUTE, KC_VOLD, KC_VOLU, KC_NO, KC_RSFT, KC_NO,
		KC_LCTL, KC_LGUI, KC_LALT, KC_BSPC, KC_BSPC, KC_BSPC, KC_DEL, KC_HOME, KC_PGDN, KC_PGUP, 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;
  }
}