qmk_firmware/keyboard/quark/common_keymaps/keymap_shane.c

// https://github.com/shanecelis/tmk_keyboard/blob/master/keyboard/planck/keymap_shane.c

#include "keymap_common.h"
#include "action_layer.h"
#include "action.h"
#include "action_util.h"

/*
  Shane's Planck Layout
  http://www.keyboard-layout-editor.com/#/layouts/015d9011102619d7695c86ffe57cf441
*/
const uint8_t PROGMEM keymaps[][MATRIX_ROWS][MATRIX_COLS] = {
  [0] = KEYMAP_AND_SWAP( /* Base */
    TAB,	Q,	W,	E,	R,	T,	Y,	U,	I,	O,	P,	MINS,
    LCTL,	A,	S,	D,	F,	G,	H,	J,	K,	L,	SCLN,	BSPC,
    LSFT,	Z,	X,	C,	V,	B,	N,	M,	COMM,	DOT,	SLSH,	FN5,
    /*ALPHA*/FN3,	/*HYPER*/	/*SUPER*/LGUI, /*META*/LALT, LCTL,	FN2,	FN6,	FN1,	LEFT,	DOWN,	UP,	RGHT),
  [2] = KEYMAP_AND_SWAP( /* More modifiers */
    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,	TRNS,	TRNS,	TRNS,	TRNS,	TRNS, RCTL, RALT, RGUI,	TRNS),
  [4] = KEYMAP_AND_SWAP( /* WASD */
    TRNS,	TRNS,	UP,	TRNS,	TRNS,	TRNS,	TRNS,	TRNS,	TRNS,	TRNS,	TRNS,	TRNS,
    TRNS,	LEFT,	DOWN,	RIGHT,	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),
  [6] = KEYMAP_AND_SWAP( /* Raise/FN1 */
    FN23,	1,	2,	3,	4,	5,	6,	7,	8,	9,	0,	EQL,
    TRNS,	F1,	F2,	F3,	F4,	F5,	F6,	F7,	F8,	F9,	F10,	ENT,
    TRNS,	TRNS,	TRNS,	TRNS,	TRNS,	TRNS,	TRNS,	TRNS,	TRNS,	TRNS,	BSLS,	TRNS,
    PAUS,	TRNS,	TRNS,	TRNS,	TRNS,	BSPC,	TRNS,	MUTE,	PGUP,	PGDN,	MNXT),
  [8] = KEYMAP_AND_SWAP( /* Lower/FN2 */
    ESC,	TRNS,	TRNS,	TRNS,	TRNS,	TRNS,	TRNS,	TRNS,	TRNS,	FN19,	FN20,	TRNS,
    TRNS,	TRNS,	TRNS,	TRNS,	CAPS,	TRNS,	TRNS,	TRNS,	TRNS,	TRNS,	TRNS,	QUOT,
    TRNS,	TRNS,	TRNS,	TRNS,	TRNS,	TRNS,	FN24,	FN25,	LBRC,	RBRC,	TRNS,	TRNS,
    FN4,	TRNS,	TRNS,	TRNS,	TRNS,	ENT,	TRNS,	MPLY,	VOLD,	VOLU,	MPRV),
};

enum function_id {
  SPACE_FN,
};

void action_function(keyrecord_t *record, uint8_t id, uint8_t opt)
{
  switch (id) {
  case SPACE_FN:
    if (record->event.pressed) {
      // Change the keyboard maps.
      // Whatever even layer's are on, turn on the odd one's too.
      for (uint8_t i = 0; i < 9; i += 2) {
        if (layer_state & (1UL << i))
          layer_on(i + 1);
      }
      layer_on(1);
    } else {
      // turn off all the even layers.
      for (uint8_t i = 0; i < 9; i += 2)
        layer_off(i + 1);

      if (record->tap.count != 0) {
        // Space was tapped rather than used like a modifier.
        // So send a space up and down event.
        add_key(KC_SPC);
        send_keyboard_report();
        del_key(KC_SPC);
        send_keyboard_report();
      }
    }
    break;
  }
}



const uint16_t PROGMEM fn_actions[] = {
  [1] = ACTION_LAYER_MOMENTARY(6),  // to fist Fn overlay
  [2] = ACTION_LAYER_MOMENTARY(8),  // to second Fn overlay
  [3] = ACTION_LAYER_TOGGLE(2), // toggle more modifiers
  [4] = ACTION_LAYER_TOGGLE(4), // toggle wasd
  [5] = ACTION_MODS_TAP_KEY(MOD_RSFT, KC_ENT),
  [6] = ACTION_FUNCTION_TAP(SPACE_FN),

  [11] = ACTION_MODS_KEY(MOD_LSFT, KC_1),
  [12] = ACTION_MODS_KEY(MOD_LSFT, KC_2),
  [13] = ACTION_MODS_KEY(MOD_LSFT, KC_3),
  [14] = ACTION_MODS_KEY(MOD_LSFT, KC_4),
  [15] = ACTION_MODS_KEY(MOD_LSFT, KC_5),
  [16] = ACTION_MODS_KEY(MOD_LSFT, KC_6),
  [17] = ACTION_MODS_KEY(MOD_LSFT, KC_7),
  [18] = ACTION_MODS_KEY(MOD_LSFT, KC_8),
  [19] = ACTION_MODS_KEY(MOD_LSFT, KC_9),
  [20] = ACTION_MODS_KEY(MOD_LSFT, KC_0),
  [21] = ACTION_MODS_KEY(MOD_LSFT, KC_MINS),
  [22] = ACTION_MODS_KEY(MOD_LSFT, KC_EQL),
  [23] = ACTION_MODS_KEY(MOD_LSFT, KC_GRV),
  [24] = ACTION_MODS_KEY(MOD_LSFT, KC_LBRC),
  [25] = ACTION_MODS_KEY(MOD_LSFT, KC_RBRC),
  [26] = ACTION_MODS_KEY(MOD_LSFT, KC_BSLS),
};