keymap_spicycode.h

static const uint8_t PROGMEM keymaps[][MATRIX_ROWS][MATRIX_COLS] = {
/*
 * Keymap: The Laye r in QWERTY
 *
 *    
 * ,--------------------------------------------------.           ,--------------------------------------------------.
 * |   =    |   1  |   2  |   3  |   4  |   5  | ESC  |           |   -  |   6  |   7  |   8  |   9  |   0  |   -    |
 * |--------+------+------+------+------+-------------|           |------+------+------+------+------+------+--------|
 * | Tab    |   Q  |   W  |   E  |   R  |   T  | FN1  |           | FN2  |   Y  |   U  |   I  |   O  |   P  |   \    |
 * |--------+------+------+------+------+------|      |           |      |------+------+------+------+------+--------|
 * | LCtrl  |   A  |   S  |   D  |   F  |   G  |------|           |------|   H  |   J  |   K  |   L  |   ;  |   '    |
 * |--------+------+------+------+------+------| LGui |           | LGui |------+------+------+------+------+--------|
 * | LShift |   Z  |   X  |   C  |   V  |   B  |      |           |      |   N  |   M  |   ,  |   .  |   /  | RShift |
 * `--------+------+------+------+------+-------------'           `-------------+------+------+------+------+--------'
 *   | FN0  |  `   |  \   | Left | Right|                                       |  Up  |  Dn  |   [  |   ] | RGui |
 *   `----------------------------------'                                       `----------------------------------'
 *                                        ,-------------.       ,-------------.
 *                                        | FN7  | FN8  |       | Ralt | L1   |
 *                                 ,------|------|------|       |------+------+------.
 *                                 |      |      | Home |       | PGUP |      |      |
 *                                 | BkSp |  DEL |------|       |------| Enter| Space|
 *                                 |      |      |  End |       | PGDN |      |      |
 *                                 `--------------------'       `--------------------'
 *  
 *
 */

    KEYMAP(  // layer 0 : default
        // left hand
       EQL, 1,   2,   3,   4,   5,   ESC,
       FN5, Q,   W,   E,   R,   T,   FN1,
       FN6, A,   S,   D,   F,   G,
       LSFT,Z,   X,   C,   V,   B,   LGUI,
       FN0, GRV, BSLS,LEFT,RGHT,
                                      FN7, FN8,
                                           HOME,
                                 BSPC,DEL, END,
        // right hand
             FN4, 6,  7,  8,   9,   0,   MINS,
             FN2, Y,  U,  I,   O,   P,   BSLS,
                  H,  J,  K,   L,   SCLN,QUOT,
             LGUI,N,  M,  COMM,DOT, SLSH,RSFT,
                      UP, DOWN,LBRC,RBRC,RGUI,
        RALT,RCTL,
        PGUP,
        PGDN, ENT, SPC
    ),

    KEYMAP(  // layer 1 : function and numpad keys
        // left hand
        TRNS,F1,  F2,  F3,  F4,  F5,  F6,
        TRNS,TRNS,TRNS,TRNS,TRNS,TRNS,FN4,
        TRNS,TRNS,TRNS,TRNS,TRNS,TRNS,
        TRNS,TRNS,TRNS,TRNS,TRNS,TRNS,TRNS,
        TRNS,TRNS,TRNS,TRNS,TRNS,
                                      TRNS,TRNS,
                                           TRNS,
                                 TRNS,TRNS,TRNS,
        // right hand
             F7,  F8,  F9,  F10, F11, F12, TRNS,
             TRNS,TRNS,P7,  P8,  P9,  PMNS,TRNS,
                  PAST,P4,  P5,  P6,  PPLS,TRNS,
             TRNS,PSLS,P1,  P2,  P3,  PENT,TRNS,
                       P0,  P0, DEL,  PENT,TRNS,
        TRNS,TRNS,
        TRNS,
        FN3, TRNS,TRNS
    ),

    KEYMAP(  // layer 2 : media layer
        // left hand
        TRNS,TRNS,TRNS,TRNS,TRNS,TRNS,MUTE,
        TRNS,TRNS,TRNS,TRNS,TRNS,TRNS,VOLU,
        TRNS,MPRV,MNXT,MSTP,MPLY,TRNS,
        TRNS,TRNS,TRNS,TRNS,TRNS,TRNS,VOLD,
        TRNS,TRNS,TRNS,TRNS,TRNS,
                                      TRNS,TRNS,
                                           TRNS,
                                 TRNS,TRNS,TRNS,
        // right hand
             TRNS,TRNS,TRNS,TRNS,TRNS,TRNS,TRNS,
             TRNS,TRNS,TRNS,TRNS,TRNS,TRNS,TRNS,
                  TRNS,TRNS,TRNS,TRNS,TRNS,TRNS,
             TRNS,TRNS,TRNS,TRNS,TRNS,TRNS,TRNS,
                       TRNS,TRNS,TRNS,TRNS,TRNS,
        TRNS,TRNS,
        TRNS,
        TRNS,TRNS,TRNS
    ),

    KEYMAP(  // layer 3: numpad
        // left hand
        TRNS,TRNS,TRNS,TRNS,TRNS,TRNS,TRNS,
        TRNS,TRNS,TRNS,TRNS,TRNS,TRNS,TRNS,
        TRNS,TRNS,TRNS,TRNS,TRNS,TRNS,
        TRNS,TRNS,TRNS,TRNS,TRNS,TRNS,TRNS,
        TRNS,TRNS,TRNS,TRNS,TRNS,
                                      TRNS,TRNS,
                                           TRNS,
                                 TRNS,TRNS,TRNS,
        // right hand
             SLCK,NLCK,PSLS,PAST,PAST,PMNS,BSPC,
             TRNS,NO,  P7,  P8,  P9,  PMNS,BSPC,
                  NO,  P4,  P5,  P6,  PPLS,PENT,
             TRNS,NO,  P1,  P2,  P3,  PPLS,PENT,
                       P0,  PDOT,SLSH,PENT,PENT,
        TRNS,TRNS,
        TRNS,
        TRNS,TRNS,TRNS
    ),

};


/* id for user defined functions & macros */
enum function_id {
    TEENSY_KEY,
    COPY_KEY,
    PASTE_KEY
};

/*
 * Fn action definition
 */
static const uint16_t PROGMEM fn_actions[] = {
    [0] = ACTION_LAYER_MOMENTARY(1),                      // FN0  - Activate Layer 1
    [1] = ACTION_MODS_KEY(MOD_LGUI | MOD_LSFT, KC_LBRC),  // FN1 = CMD + Shift + [
    [2] = ACTION_MODS_KEY(MOD_LGUI | MOD_LSFT, KC_RBRC),  // FN2 - CMD + Shift + ]
    [3] = ACTION_FUNCTION(TEENSY_KEY),                    // FN3 - Teensy Key
    [4] = ACTION_LAYER_MOMENTARY(2),                      // FN4 - Media Layer
    [5] = ACTION_MODS_TAP_KEY(MOD_LGUI, KC_TAB),          // FN5 - Tab on tap, LGui on hold
    [6] = ACTION_MODS_TAP_KEY(MOD_LCTL, KC_ESC),          // FN6 - ESC on tap, Control on hold
    [7] = ACTION_FUNCTION_TAP(COPY_KEY),                  // FN7 - LGui+C on tap, LGui on hold
    [8] = ACTION_FUNCTION_TAP(PASTE_KEY),                 // FN8 - LGui+V on tap, LGui on hold
};

void action_function(keyrecord_t *record, uint8_t id, uint8_t opt)
{
    if (id == TEENSY_KEY) {
        clear_keyboard();
        _delay_ms(50);
        bootloader_jump(); // should not return
    }

    /*
     * This allows my LGui and LAlt keys to double as copy and paste
     * macros when tapped.
     *
     * Largely copied (like the rest of this keymap) from cub's map.
     */
    if (id == COPY_KEY || id == PASTE_KEY) {
        if (record->tap.count == 0 || record->tap.interrupted) {
            uint8_t weak_mods;

            if (id == COPY_KEY) {
                weak_mods = MOD_LGUI;
            } else {
                weak_mods = MOD_LALT;
            }

            if (record->event.pressed) {
                add_weak_mods(weak_mods);
            } else {
                del_weak_mods(weak_mods);

                /* It appears to be necessary to send a report here to
                 * avoid having LGui get "stuck" on. */
                send_keyboard_report();
            }
        } else {
            uint8_t keycode;

            if (id == COPY_KEY) {
              keycode = KC_C;
            } else {
              keycode = KC_V;
            }

            if (record->event.pressed) {
                add_weak_mods(MOD_LGUI);
                add_key(keycode);
                send_keyboard_report();
            } else {
                del_weak_mods(MOD_LGUI);
                del_key(keycode);
                send_keyboard_report();
            }
        }
    }
}

#define FN_ACTIONS_SIZE     (sizeof(fn_actions) / sizeof(fn_actions[0]))

/*
 * translates Fn keycode to action
 * for some layers, use different translation table
 */
action_t keymap_fn_to_action(uint8_t keycode)
{
    action_t action;
    action.code = ACTION_NO;

    // by default, use fn_actions from default layer 0
    // this is needed to get mapping for same key, that was used switch to some layer,
    // to have possibility to switch layers back
    if (action.code == ACTION_NO && FN_INDEX(keycode) < FN_ACTIONS_SIZE) {
        action.code = pgm_read_word(&fn_actions[FN_INDEX(keycode)]);
    }

    return action;
}