keymap.c

#include QMK_KEYBOARD_H

enum mitosis_layers
{
  _QWERTY,
  _SHIFTED,
  _FUNCTION,
  _FUNCSHIFT,
};

enum mitosis_keycodes
{
  FNKEY = SAFE_RANGE,
  SHIFT,
  DYNAMIC_MACRO_RANGE,
};


// Macro definitions for readability
enum mitosis_macros
{
  VOLU,
  VOLD,
  ESCM
};


#include "dynamic_macro.h"

#define LONGPRESS_DELAY 150
#define LAYER_TOGGLE_DELAY 900

// Fillers to make layering more clear
#define _______ KC_TRNS
#define __MOD__ KC_TRNS
#define XXXXXXX KC_NO

const uint16_t PROGMEM keymaps[][MATRIX_ROWS][MATRIX_COLS] = {
  [_QWERTY] = LAYOUT( /* QWERTY adapted to this crazy thing */
    KC_Q, KC_W, KC_E, KC_R, KC_T,          KC_Y, KC_U, KC_I,    KC_O,   KC_P,
    KC_A, KC_S, KC_D, KC_F, KC_G,          KC_H, KC_J, KC_K,    KC_L,   KC_SCLN,
    KC_Z, KC_X, KC_C, KC_V, KC_B,          KC_N, KC_M, KC_COMM, KC_DOT, KC_SLSH,
    /* TODO */
    KC_LCTL, M(ESCM),  KC_TAB, KC_QUOT,    KC_LEFT, KC_DOWN, KC_UP,   KC_RIGHT,
    KC_LALT, KC_LGUI,  KC_SPC,  SHIFT,     FNKEY,   KC_BSPC, KC_ENT,  _______
  ),


  [_SHIFTED] = LAYOUT( /* Shifted Layer, layered so that tri_layer can be used, or selectively
                                         able to modify individual key's shifted behaviour */
    _______, _______, _______, _______, _______,       _______, _______, _______, _______, _______,
    _______, _______, _______, _______, _______,       _______, _______, _______, _______, _______,
    _______, _______, _______, _______, _______,       _______, _______, _______, _______, _______,
             __MOD__, KC_DEL,  _______, _______,       _______, _______, _______, _______,
             __MOD__, __MOD__, _______, __MOD__,       __MOD__, _______, _______, XXXXXXX
  ),


  [_FUNCTION] = LAYOUT( /* Function Layer mimicks planck's raise layer somewhat */
    KC_1,       KC_2,          KC_3,    KC_4,      KC_5,          KC_6,    KC_7,    KC_8,    KC_9,    KC_0,
    LCTL(KC_A), LCTL(KC_S),    _______, LCTL(KC_F),_______,       _______, KC_MINS, KC_EQL,  KC_LBRC, KC_RBRC,
    LCTL(KC_Z), LCTL(KC_X), LCTL(KC_C), LCTL(KC_V),_______,       _______, KC_BSLS, _______, _______, KC_QUOT,
                __MOD__,        KC_DEL, _______,   KC_GRV,        KC_HOME, KC_PGDN, KC_PGUP, KC_END,
                __MOD__,       __MOD__, _______,   __MOD__,       __MOD__, _______, KC_PSCR, XXXXXXX
  ),

  [_FUNCSHIFT] = LAYOUT( /* Function Shifted Layer mimicks planck's lower layer somewhat */
    _______, _______, _______, _______, _______,       _______, _______, _______, _______, _______,
    KC_F1,   KC_F2,   KC_F3,   KC_F4,   KC_F5,         KC_F6,   _______, _______, KC_LCBR, KC_RCBR,
    KC_F7,   KC_F8,   KC_F9,   KC_F10,  KC_F11,        KC_F12,  _______, _______, _______, _______,
             __MOD__, KC_DEL,  _______, KC_TILD,       _______, _______, _______, _______,
             __MOD__, __MOD__, _______, __MOD__,       __MOD__, _______, _______, _______
  ),
};

const uint16_t PROGMEM fn_actions[] = {};

static uint16_t key_timer;

const macro_t *action_get_macro(keyrecord_t *record, uint8_t id, uint8_t opt)
{
  // MACRODOWN only works in this function
  switch(id) {

  //switch multiplexing for media, short tap for volume up, long press for play/pause
  case VOLU:
    if (record->event.pressed) {
      key_timer = timer_read();           // if the key is being pressed, we start the timer.
    } else {         // this means the key was just released, so we can figure out how long it was pressed for (tap or "held down").
      if (timer_elapsed(key_timer) > LONGPRESS_DELAY) {           // LONGPRESS_DELAY being 150ms, the threshhold we pick for counting something as a tap.
        return MACRO(T(MPLY), END);
      } else {
        return MACRO(T(VOLU), END);
      }
    }
    break;

  //switch multiplexing for media, short tap for volume down, long press for next track
  case VOLD:
    if (record->event.pressed) {
      key_timer = timer_read();
    } else {
      if (timer_elapsed(key_timer) > LONGPRESS_DELAY) {
        return MACRO(T(MNXT), END);
      } else {
        return MACRO(T(VOLD), END);
      }
    }
    break;

  //switch multiplexing for escape, short tap for escape, long press for context menu
  case ESCM:
    if (record->event.pressed) {
      key_timer = timer_read();
    } else {
      if (timer_elapsed(key_timer) > LONGPRESS_DELAY) {
        return MACRO(T(APP), END);
      } else {
        return MACRO(T(ESC), END);
      }
    }
    break;
  }
  return MACRO_NONE;
};

static bool singular_key = false;

bool process_record_user(uint16_t keycode, keyrecord_t *record) {
  // get the current layer
  uint8_t layer = biton32(layer_state);

  //custom layer handling for tri_layer,
  switch (keycode) {
  case FNKEY:
    if (record->event.pressed) {
      key_timer = timer_read();
      singular_key = true;
      layer_on(_FUNCTION);
    } else {
      if (timer_elapsed(key_timer) < LAYER_TOGGLE_DELAY || !singular_key) {
        layer_off(_FUNCTION);
      }
    }
    update_tri_layer(_FUNCTION, _SHIFTED, _FUNCSHIFT);
    return false;
    break;
  //SHIFT is handled as LSHIFT in the general case
  case SHIFT:
    if (record->event.pressed) {
      key_timer = timer_read();
      singular_key = true;
      layer_on(_SHIFTED);
      register_code(KC_LSFT);
    } else {
      if (timer_elapsed(key_timer) < LAYER_TOGGLE_DELAY || !singular_key) {
        layer_off(_SHIFTED);
        unregister_code(KC_LSFT);
      }
    }
    update_tri_layer(_FUNCTION, _SHIFTED, _FUNCSHIFT);
    return false;
    break;
  //If any other key was pressed during the layer mod hold period,
  //then the layer mod was used momentarily, and should block latching
  default:
    singular_key = false;
    break;
  }

  //FUNCSHIFT has been shifted by the SHIFT handling, some keys need to be excluded
  if (layer == _FUNCSHIFT) {
    //F1-F12 should be sent as unshifted keycodes,
    //and ] needs to be unshifted or it is sent as }
    if ( (keycode >= KC_F1 && keycode <= KC_F12)
         || keycode == KC_RBRC ) {
      if (record->event.pressed) {
        unregister_mods(MOD_LSFT);
      } else {
        register_mods(MOD_LSFT);
      }
    }
  }

  return true;
};

void matrix_scan_user(void) {
  uint8_t layer = biton32(layer_state);

  switch (layer) {
  case _QWERTY:
    set_led_off;
    break;
  case _FUNCTION:
    set_led_blue;
    break;
  case _SHIFTED:
    set_led_red;
    break;
  case _FUNCSHIFT:
    set_led_green;
    break;
  default:
    break;
  }
};