text: #include QMK_KEYBOARD_H
  #include "version.h"
  
  enum custom_layers {
      BASE,   // default layer
      SYMB,   // symbols
      MDIA,   // media keys
  };
  
  
  enum custom_keycodes {
    PLACEHOLDER = SAFE_RANGE, // can always be here
    VRSN,
    RGB_SLD
  };
  
  const uint16_t PROGMEM keymaps[][MATRIX_ROWS][MATRIX_COLS] = {
  /* Keymap 0: Basic layer
   *
   * ,--------------------------------------------------.           ,--------------------------------------------------.
   * |   =    |   1  |   2  |   3  |   4  |   5  | LEFT |           | RIGHT|   6  |   7  |   8  |   9  |   0  |   -    |
   * |--------+------+------+------+------+-------------|           |------+------+------+------+------+------+--------|
   * | Del    |   Q  |   W  |   E  |   R  |   T  |  L1  |           |  L1  |   Y  |   U  |   I  |   O  |   P  |   \    |
   * |--------+------+------+------+------+------|      |           |      |------+------+------+------+------+--------|
   * | BkSp   |   A  |   S  |   D  |   F  |   G  |------|           |------|   H  |   J  |   K  |   L  |; / L2|' / Cmd |
   * |--------+------+------+------+------+------| Hyper|           | Meh  |------+------+------+------+------+--------|
   * | LShift |Z/Ctrl|   X  |   C  |   V  |   B  |      |           |      |   N  |   M  |   ,  |   .  |//Ctrl| RShift |
   * `--------+------+------+------+------+-------------'           `-------------+------+------+------+------+--------'
   *   |Grv/L1|  '"  |AltShf| Left | Right|                                       |  Up  | Down |   [  |   ]  | ~L1  |
   *   `----------------------------------'                                       `----------------------------------'
   *                                        ,-------------.       ,-------------.
   *                                        | App  | LGui |       | Alt  |Ctrl/Esc|
   *                                 ,------|------|------|       |------+--------+------.
   *                                 |      |      | Home |       | PgUp |        |      |
   *                                 | Space|Backsp|------|       |------|  Tab   |Enter |
   *                                 |      |ace   | End  |       | PgDn |        |      |
   *                                 `--------------------'       `----------------------'
   */
  // If it accepts an argument (i.e, is a function), it doesn't need KC_.
  // Otherwise, it needs KC_*
  [BASE] = LAYOUT_ergodox(  // layer 0 : default
          // left hand
          KC_EQL,         KC_1,         KC_2,   KC_3,   KC_4,   KC_5,   KC_LEFT,
          KC_DEL,         KC_Q,         KC_W,   KC_E,   KC_R,   KC_T,   TG(SYMB),
          KC_BSPC,        KC_A,         KC_S,   KC_D,   KC_F,   KC_G,
          KC_LSFT,        CTL_T(KC_Z),  KC_X,   KC_C,   KC_V,   KC_B,   ALL_T(KC_NO),
          LT(SYMB,KC_GRV),KC_QUOT,      LALT(KC_LSFT),  KC_LEFT,KC_RGHT,
                                                ALT_T(KC_APP),  KC_LGUI,
                                                                KC_HOME,
                                                 KC_SPC,KC_BSPC,KC_END,
          // right hand
               KC_RGHT,     KC_6,   KC_7,  KC_8,   KC_9,   KC_0,             KC_MINS,
               TG(SYMB),    KC_Y,   KC_U,  KC_I,   KC_O,   KC_P,             KC_BSLS,
                            KC_H,   KC_J,  KC_K,   KC_L,   LT(MDIA, KC_SCLN),GUI_T(KC_QUOT),
               MEH_T(KC_NO),KC_N,   KC_M,  KC_COMM,KC_DOT, CTL_T(KC_SLSH),   KC_RSFT,
                                    KC_UP, KC_DOWN,KC_LBRC,KC_RBRC,          TT(SYMB),
               KC_LALT,        CTL_T(KC_ESC),
               KC_PGUP,
               KC_PGDN,KC_TAB, KC_ENT
      ),
  /* Keymap 1: Symbol Layer
   *
   * ,---------------------------------------------------.           ,--------------------------------------------------.
   * |Version  |  F1  |  F2  |  F3  |  F4  |  F5  |      |           |      |  F6  |  F7  |  F8  |  F9  |  F10 |   F11  |
   * |---------+------+------+------+------+------+------|           |------+------+------+------+------+------+--------|
   * |         |   !  |   @  |   {  |   }  |   |  |      |           |      |   Up |   7  |   8  |   9  |   *  |   F12  |
   * |---------+------+------+------+------+------|      |           |      |------+------+------+------+------+--------|
   * |         |   #  |   $  |   (  |   )  |   `  |------|           |------| Down |   4  |   5  |   6  |   +  |        |
   * |---------+------+------+------+------+------|      |           |      |------+------+------+------+------+--------|
   * |         |   %  |   ^  |   [  |   ]  |   ~  |      |           |      |   &  |   1  |   2  |   3  |   \  |        |
   * `---------+------+------+------+------+-------------'           `-------------+------+------+------+------+--------'
   *   |EEP_RST|      |      |      |      |                                       |      |    . |   0  |   =  |      |
   *   `-----------------------------------'                                       `----------------------------------'
   *                                        ,-------------.       ,-------------.
   *                                        |Animat|      |       |Toggle|Solid |
   *                                 ,------|------|------|       |------+------+------.
   *                                 |Bright|Bright|      |       |      |Hue-  |Hue+  |
   *                                 |ness- |ness+ |------|       |------|      |      |
   *                                 |      |      |      |       |      |      |      |
   *                                 `--------------------'       `--------------------'
   */
  // SYMBOLS
  [SYMB] = LAYOUT_ergodox(
         // left hand
         VRSN,   KC_F1,  KC_F2,  KC_F3,  KC_F4,  KC_F5,  KC_TRNS,
         KC_TRNS,KC_EXLM,KC_AT,  KC_LCBR,KC_RCBR,KC_PIPE,KC_TRNS,
         KC_TRNS,KC_HASH,KC_DLR, KC_LPRN,KC_RPRN,KC_GRV,
         KC_TRNS,KC_PERC,KC_CIRC,KC_LBRC,KC_RBRC,KC_TILD,KC_TRNS,
         EEP_RST,KC_TRNS,KC_TRNS,KC_TRNS,KC_TRNS,
                                         RGB_MOD,KC_TRNS,
                                                 KC_TRNS,
                                 RGB_VAD,RGB_VAI,KC_TRNS,
         // right hand
         KC_TRNS, KC_F6,   KC_F7,  KC_F8,   KC_F9,   KC_F10,  KC_F11,
         KC_TRNS, KC_UP,   KC_7,   KC_8,    KC_9,    KC_ASTR, KC_F12,
                  KC_DOWN, KC_4,   KC_5,    KC_6,    KC_PLUS, KC_TRNS,
         KC_TRNS, KC_AMPR, KC_1,   KC_2,    KC_3,    KC_BSLS, KC_TRNS,
                           KC_TRNS,KC_DOT,  KC_0,    KC_EQL,  KC_TRNS,
         RGB_TOG, RGB_SLD,
         KC_TRNS,
         KC_TRNS, RGB_HUD, RGB_HUI
  ),
  /* Keymap 2: Media and mouse keys
   *
   * ,--------------------------------------------------.           ,--------------------------------------------------.
   * |        |      |      |      |      |      |      |           |      |      |      |      |      |      |        |
   * |--------+------+------+------+------+-------------|           |------+------+------+------+------+------+--------|
   * |        |      |      | MsUp |      |      |      |           |      |      |      |      |      |      |        |
   * |--------+------+------+------+------+------|      |           |      |------+------+------+------+------+--------|
   * |        |      |MsLeft|MsDown|MsRght|      |------|           |------|      |      |      |      |      |  Play  |
   * |--------+------+------+------+------+------|      |           |      |------+------+------+------+------+--------|
   * |        |      |      |      |      |      |      |           |      |      |      | Prev | Next |      |        |
   * `--------+------+------+------+------+-------------'           `-------------+------+------+------+------+--------'
   *   |      |      |      | Lclk | Rclk |                                       |VolUp |VolDn | Mute |      |      |
   *   `----------------------------------'                                       `----------------------------------'
   *                                        ,-------------.       ,-------------.
   *                                        |      |      |       |      |      |
   *                                 ,------|------|------|       |------+------+------.
   *                                 |      |      |      |       |      |      |Brwser|
   *                                 |      |      |------|       |------|      |Back  |
   *                                 |      |      |      |       |      |      |      |
   *                                 `--------------------'       `--------------------'
   */
  // MEDIA AND MOUSE
  [MDIA] = LAYOUT_ergodox(
         KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS,
         KC_TRNS, KC_TRNS, KC_TRNS, KC_MS_U, KC_TRNS, KC_TRNS, KC_TRNS,
         KC_TRNS, KC_TRNS, KC_MS_L, KC_MS_D, KC_MS_R, KC_TRNS,
         KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS,
         KC_TRNS, KC_TRNS, KC_TRNS, KC_BTN1, KC_BTN2,
                                             KC_TRNS, KC_TRNS,
                                                      KC_TRNS,
                                    KC_TRNS, KC_TRNS, KC_TRNS,
      // right hand
         KC_TRNS,  KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS,
         KC_TRNS,  KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS,
                   KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS, KC_MPLY,
         KC_TRNS,  KC_TRNS, KC_TRNS, KC_MPRV, KC_MNXT, KC_TRNS, KC_TRNS,
                            KC_VOLU, KC_VOLD, KC_MUTE, KC_TRNS, KC_TRNS,
         KC_TRNS, KC_TRNS,
         KC_TRNS,
         KC_TRNS, KC_TRNS, KC_WBAK
  ),
  };
  
  bool process_record_user(uint16_t keycode, keyrecord_t *record) {
    switch (keycode) {
      // dynamically generate these.
      case VRSN:
        if (record->event.pressed) {
          SEND_STRING (QMK_KEYBOARD "/" QMK_KEYMAP " @ " QMK_VERSION);
        }
        return false;
        break;
      case RGB_SLD:
        if (record->event.pressed) {
          #ifdef RGBLIGHT_ENABLE
            rgblight_mode(1);
          #endif
        }
        return false;
        break;
    }
    return true;
  }
  
  // Runs just one time when the keyboard initializes.
  void matrix_init_user(void) {
  
  };
  
  
  // Runs constantly in the background, in a loop.
  void matrix_scan_user(void) {
  
      uint8_t layer = biton32(layer_state);
  
      ergodox_board_led_off();
      ergodox_right_led_1_off();
      ergodox_right_led_2_off();
      ergodox_right_led_3_off();
      switch (layer) {
        // TODO: Make this relevant to the ErgoDox EZ.
          case 1:
              ergodox_right_led_1_on();
              break;
          case 2:
              ergodox_right_led_2_on();
              break;
          default:
              // none
              break;
      }
  
  };
  