qmk_firmware/keyboards/planck/keymaps/impossible/keymap.c

#include QMK_KEYBOARD_H

extern keymap_config_t keymap_config;

// 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 _WORKMAN 0
#define _FN 1
#define _QWERTY 2
#define _QW_FN 3
#define _PLOVER 4
#define _ADJ 5

enum planck_keycodes {
  WORKMAN = SAFE_RANGE,
  QWERTY,
  PLOVER
};

const uint16_t PROGMEM keymaps[][MATRIX_ROWS][MATRIX_COLS] = {

/* Workman Alpha-numeric
 * ,-----------------------------------------------------------------------------------------------.
 * |   Q   |   D   |   R   |   W   |   B   |   F   |   U   |   P   |   J   |   7   |   8   |   9   |
 * |-------+-------+-------+-------+-------+-------+-------+-------+-------+-------+-------+-------|
 * |   A   |   S   |   H   |   T   |   G   |   N   |   E   |   O   |   I   |   4   |   5   |   6   |
 * |-------+-------+-------+-------+-------+-------|-------+-------+-------+-------+-------+-------|
 * |   Z   |   X   |   M   |   C   |   V   |   L   |   Y   |   K   |   Up  |   1   |   2   |   3   |
 * |-------+-------+-------+-------+-------+-------+-------+-------+-------+-------+-------+-------|
 * |Alt/Tab|Gui/Esc|   ,   |CTL/Bsp| Fn/Ent|SFT/SPC|   .   |  Left |  Down | Right |   0   |Adj/Ent|
 * `-----------------------------------------------------------------------------------------------'
 */

[_WORKMAN] = LAYOUT_planck_grid(
  KC_Q,          KC_D,          KC_R,    KC_W,           KC_B,            KC_F,          KC_U,   KC_P,    KC_J,    KC_KP_7, KC_KP_8, KC_KP_9,
  KC_A,          KC_S,          KC_H,    KC_T,           KC_G,            KC_N,          KC_E,   KC_O,    KC_I,    KC_KP_4, KC_KP_5, KC_KP_6,
  KC_Z,          KC_X,          KC_M,    KC_C,           KC_V,            KC_L,          KC_Y,   KC_K,    KC_UP,   KC_KP_1, KC_KP_2, KC_KP_3,
  ALT_T(KC_TAB), GUI_T(KC_ESC), KC_COMM, CTL_T(KC_BSPC), LT(_FN, KC_ENT), SFT_T(KC_SPC), KC_DOT, KC_LEFT, KC_DOWN, KC_RGHT, KC_KP_0, LT(_ADJ, KC_ENT)
),

/* FN-key held (Workman)
 * ,-----------------------------------------------------------------------------------------------.
 * |   !   |   @   |   #   |   $   |   %   |   ^   |   &   |   *   |  F12  |   F7  |   F8  |   F9  |
 * |-------+-------+-------+-------+-------+-------+-------+-------+-------+-------+-------+-------|
 * |  Tab  |   [   |   ]   |   -   |  Del  |   '   |   (   |   )   |  F11  |   F4  |   F5  |   F6  |
 * |-------+-------+-------+-------+-------+-------|-------+-------+-------+-------+-------+-------|
 * |  Menu |       |       |   =   |   \   |   /   |       |       |  PgUp |   F1  |   F2  |   F3  |
 * |-------+-------+-------+-------+-------+-------+-------+-------+-------+-------+-------+-------|
 * |Alt/Tab|  Gui  |   ~   |CTL/Bsp| Fn/Ent|SFT/Spc|   ;   |  Home |  PgDn |  End  |  F10  |Adj/Ent|
 * `-----------------------------------------------------------------------------------------------'
 */

[_FN] = LAYOUT_planck_grid(
  KC_EXLM, KC_AT,   KC_HASH,  KC_DLR,   KC_PERC,   KC_CIRC, KC_AMPR,   KC_ASTR, KC_F12,  KC_F7,  KC_F8,  KC_F9,
  KC_TAB,  KC_LBRC, KC_RBRC,  KC_MINUS, KC_DELETE, KC_QUOT, KC_LPRN,   KC_RPRN, KC_F11,  KC_F4,  KC_F5,  KC_F6,
  KC_MENU, _______, _______,  KC_EQUAL, KC_BSLS,   KC_SLSH, XXXXXXX,   XXXXXXX, KC_PGUP, KC_F1,  KC_F2,  KC_F3,
  _______, KC_LGUI, KC_GRAVE, _______,  _______,   _______, KC_SCLN,   KC_HOME, KC_PGDN, KC_END, KC_F10, _______
),

/* Qwerty
 * ,-----------------------------------------------------------------------------------------------.
 * |Gui/Esc|   1   |   2   |   3   |   4   |   5   |   6   |   7   |   8   |   9   |   0   | Bksp  |
 * |-------+-------+-------+-------+-------+---------------+-------+-------+-------+-------+-------|
 * | Ctrl  |   Q   |   W   |   E   |   R   |   T   |   Y   |   U   |   I   |   O   |   P   |   /   |
 * |-------+-------+-------+-------+-------+---------------+-------+-------+-------+-------+-------|
 * | Shift |   A   |   S   |   D   |   F   |   G   |   H   |   J   |   K   |   L   |   ;   |   "   |
 * |-------+-------+-------+-------+-------+-------|-------+-------+-------+-------+-------+-------|
 * |Alt/Tab|   Z   |   X   |   C   |   V   | Fn/SPC|   B   |   N   |   M   |   ,   |   .   |Adj/Ent|
 * `-----------------------------------------------------------------------------------------------'
 */

[_QWERTY] = LAYOUT_planck_grid(
  GUI_T(KC_ESC), KC_1, KC_2, KC_3, KC_4, KC_5,               KC_6, KC_7, KC_8, KC_9,    KC_0,    KC_BSPC,
  KC_LCTL,       KC_Q, KC_W, KC_E, KC_R, KC_T,               KC_Y, KC_U, KC_I, KC_O,    KC_P,    KC_ENT,
  KC_LSFT,       KC_A, KC_S, KC_D, KC_F, KC_G,               KC_H, KC_J, KC_K, KC_L,    KC_SCLN, KC_QUOT,
  ALT_T(KC_TAB), KC_Z, KC_X, KC_C, KC_V, LT(_QW_FN, KC_SPC), KC_B, KC_N, KC_M, KC_COMM, KC_DOT,  LT(_ADJ, KC_ENT)
),

/* FN-key held (Qwerty)
 * ,-----------------------------------------------------------------------------------------------.
 * |  Gui  |   F1  |   F2  |   F3  |   F4  |   F5  |   F6  |   F7  |   F8  |   F9  |  F10  |  F11  |
 * |-------+-------+-------+-------+-------+-------+-------+-------+-------+-------+-------+-------|
 * |  Ctrl |   ~   |   [   |  PgUp |   ]   |       |       |   -   |   Up  |   =   |       |  F12  |
 * |-------+-------+-------+-------+-------+-------+-------+-------+-------+-------+-------+-------|
 * | Shift |  Tab  |  Home |  PgDn |  End  |  Del  |       |  Left |  Down | Right |       |       |
 * |-------+-------+-------+-------+-------+-------|-------+-------+-------+-------+-------+-------|
 * |Alt/Tab|       |       |       |       | Fn/Spc|       |       |       |       |  Menu |Adj/Ent|
 * `-----------------------------------------------------------------------------------------------'
 */

[_QW_FN] = LAYOUT_planck_grid(
  KC_LGUI, KC_F1,    KC_F2,   KC_F3,   KC_F4,   KC_F5,     KC_F6,   KC_F7,   KC_F8,   KC_F9,    KC_F10,  KC_F11,
  _______, KC_GRAVE, KC_LBRC, KC_PGUP, KC_RBRC, XXXXXXX,   XXXXXXX, KC_MINS, KC_UP,   KC_EQUAL, XXXXXXX, KC_F12,
  _______, KC_TAB,   KC_HOME, KC_PGDN, KC_END,  KC_DELETE, XXXXXXX, KC_LEFT, KC_DOWN, KC_RIGHT, XXXXXXX, XXXXXXX,
  _______, XXXXXXX,  XXXXXXX, XXXXXXX, XXXXXXX, _______,   XXXXXXX, _______, _______, _______,  KC_MENU, _______
),

/* Plover layer (http://opensteno.org)
 * ,-----------------------------------------------------------------------------------------------.
 * |   S   |   T   |   P   |   H   |   *   |   F   |   P   |   L   |   T   |   D   |       |       |
 * |-------+-------+-------+-------+-------+-------|-------+-------+-------+-------+-------+-------|
 * |   S   |   K   |   W   |   R   |   *   |   R   |   B   |   G   |   S   |   Z   |       |       |
 * |-------+-------+-------+-------+-------+-------+-------+-------+-------+-------+-------+-------|
 * |   #   |   #   |   #   |   #   |       |   #   |   #   |   #   |   #   |   #   |       |       |
 * |-------+-------+-------+-------+-------+---------------+-------+-------+-------+-------+-------|
 * |       |       |   A   |   O   |       |   E   |   U   |       |       |       |       |Adj/Ent|
 * `-----------------------------------------------------------------------------------------------'
 */

[_PLOVER] = LAYOUT_planck_grid(
  KC_Q,    KC_W,    KC_E, KC_R, KC_T,    KC_U, KC_I, KC_O,    KC_P,    KC_LBRC, XXXXXXX, XXXXXXX,
  KC_A,    KC_S,    KC_D, KC_F, KC_G,    KC_J, KC_K, KC_L,    KC_SCLN, KC_QUOT, XXXXXXX, XXXXXXX,
  KC_1,    KC_1,    KC_1, KC_1, XXXXXXX, KC_1, KC_1, KC_1,    KC_1,    KC_1,    XXXXXXX, XXXXXXX,
  XXXXXXX, XXXXXXX, KC_C, KC_V, XXXXXXX, KC_N, KC_M, XXXXXXX, XXXXXXX, XXXXXXX, XXXXXXX, LT(_ADJ, KC_ENT)
),

/* Adjust
 * ,-----------------------------------------------------------------------------------------------.
 * |       |       |       |       |       |       |       |       | Insert| PrtSc | Pause | QK_BOOT |
 * |-------+-------+-------+-------+-------+---------------+-------+-------+-------+-------+-------|
 * |       |       |       |       |       |       |       | CapLk |Voice +| Audio |MIDIoff|       |
 * |-------+-------+-------+-------+-------+-------|-------+-------+-------+-------+-------+-------|
 * |       |       |       |       |       |       |       | ScrLk |Voice -| Music |MIDI on|       |
 * |-------+-------+-------+-------+-------+-------+-------+-------+-------+-------+-------+-------|
 * |       |       |       |       |       |       |       | Numlk |Workman| Qwerty| Plover|Adj/Ent|
 * `-----------------------------------------------------------------------------------------------'
 */

[_ADJ] = LAYOUT_planck_grid(
  _______, _______, _______, _______, _______, _______, _______, _______, KC_INS,  KC_PSCR, KC_PAUSE, QK_BOOT,
  _______, _______, _______, _______, _______, _______, _______, KC_CAPS, AU_NEXT, AU_TOGG, MI_OFF,   _______,
  _______, _______, _______, _______, _______, _______, _______, KC_SCRL, AU_PREV, MU_TOGG, MI_ON,    _______,
  _______, _______, _______, _______, _______, _______, _______, KC_NUM,  WORKMAN, QWERTY,  PLOVER,   _______
)

};

#ifdef AUDIO_ENABLE
float tone_workman[][2]    = SONG(QWERTY_SOUND);
float tone_qwerty[][2]     = SONG(COLEMAK_SOUND);
float tone_plover[][2]     = SONG(PLOVER_SOUND);
#endif


void persistent_default_layer_set(uint16_t default_layer) {
  eeconfig_update_default_layer(default_layer);
  default_layer_set(default_layer);
}

bool process_record_user(uint16_t keycode, keyrecord_t *record) {
  switch (keycode) {
    case WORKMAN:
      if (record->event.pressed) {
        #ifdef AUDIO_ENABLE
          PLAY_SONG(tone_workman);
        #endif
        persistent_default_layer_set(1UL<<_WORKMAN);
      }
      return false;
      break;
    case QWERTY:
      if (record->event.pressed) {
        #ifdef AUDIO_ENABLE
          PLAY_SONG(tone_qwerty);
        #endif
        persistent_default_layer_set(1UL<<_QWERTY);
      }
      return false;
      break;
    case PLOVER:
      if (record->event.pressed) {
        #ifdef AUDIO_ENABLE
          PLAY_SONG(tone_plover);
        #endif
        if (!eeconfig_is_enabled()) {
          eeconfig_init();
        }
        keymap_config.raw = eeconfig_read_keymap();
        keymap_config.nkro = 1;
        eeconfig_update_keymap(keymap_config.raw);
        persistent_default_layer_set(1UL<<_PLOVER);
      }
      return false;
      break;
  }
  return true;
}