QMK keymap with a functioning alt+tab on a layer

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/**
 * Copyright 2022 Charly Delay <[email protected]> (@0xcharly)
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
#include QMK_KEYBOARD_H

enum charybdis_keymap_layers {
    LAYER_BASE = 0,
    LAYER_LOWER,
    LAYER_RAISE,
    LAYER_POINTER,
    LAYER_MAJ,
    LAYER_GAME,
};


static uint8_t current_layer = LAYER_BASE;

enum custom_keycodes {
  PLACEHOLDER = SAFE_RANGE, // can always be here
  CK_STAB,
  CK_STABB
};

/** \brief Automatically enable sniping-mode on the pointer layer. */
#define CHARYBDIS_AUTO_SNIPING_ON_LAYER LAYER_POINTER

#ifdef CHARYBDIS_AUTO_POINTER_LAYER_TRIGGER_ENABLE
static uint16_t auto_pointer_layer_timer = 0;

#    ifndef CHARYBDIS_AUTO_POINTER_LAYER_TRIGGER_TIMEOUT_MS
#        define CHARYBDIS_AUTO_POINTER_LAYER_TRIGGER_TIMEOUT_MS 1000
#    endif // CHARYBDIS_AUTO_POINTER_LAYER_TRIGGER_TIMEOUT_MS

#    ifndef CHARYBDIS_AUTO_POINTER_LAYER_TRIGGER_THRESHOLD
#        define CHARYBDIS_AUTO_POINTER_LAYER_TRIGGER_THRESHOLD 8
#    endif // CHARYBDIS_AUTO_POINTER_LAYER_TRIGGER_THRESHOLD
#endif     // CHARYBDIS_AUTO_POINTER_LAYER_TRIGGER_ENABLE

#define LOWER MO(LAYER_LOWER)
#define RAISE MO(LAYER_RAISE)
#define PT_Z LT(LAYER_POINTER, KC_Z)
#define PT_SLSH LT(LAYER_POINTER, KC_SLSH)
#define HRM_A_ALTGR MT(MOD_LALT | MOD_RALT, KC_A)
#define HRM_S_ALT   MT(MOD_LALT, KC_S)
#define HRM_D_SHIFT MT(MOD_LSFT, KC_D)
#define HRM_F_CTRL  MT(MOD_LCTL, KC_F)
#define HRM_J_CTRL  MT(MOD_LCTL, KC_J)
#define HRM_K_SHIFT MT(MOD_LSFT, KC_K)
#define HRM_L_ALT   MT(MOD_LALT, KC_L)
#define HRM_SCLN_ALT MT(MOD_LALT | MOD_RALT, KC_SCLN)
// clang-format off
const uint16_t PROGMEM keymaps[][MATRIX_ROWS][MATRIX_COLS] = {
  [LAYER_BASE] = LAYOUT(

  // ╭────────────────────────────────────────────────────────────────────────╮     ╭───────────────────────────────────────────────────────────────────────╮
      KC_TAB,  KC_Q,        KC_W,       KC_E,         KC_R,        KC_T,             KC_Y,    KC_U,       KC_I,        KC_O,       KC_P,          KC_LBRC,
  //├───────────────────────────────────────────────────────────────────────┤     ├────────────────────────────────────────────────────────────────────────┤
      KC_ESC, HRM_A_ALTGR,  HRM_S_ALT,  HRM_D_SHIFT,  HRM_F_CTRL,  KC_G,             KC_H,    HRM_J_CTRL, HRM_K_SHIFT, HRM_L_ALT,  HRM_SCLN_ALT,  KC_QUOT,
 //├───────────────────────────────────────────────────────────────────────┤     ├────────────────────────────────────────────────────────────────────────┤
      KC_LSFT, KC_RBRC,     KC_X,       KC_C,         KC_V,        KC_B,             KC_N,    KC_M,       KC_COMM,     KC_DOT,     KC_SLSH,       KC_LGUI,
//├───────────────────────────────────────────────────────────────────────┤     ├────────────────────────────────────────────────────────────────────────┤
                                        KC_SPC,       RAISE,       MO(3),            KC_ENT,  LOWER
//                                   ╰──────────────────────────────────╯     ╰─────────────────────╯




  // ╭──────────────────────────────────────────────────────╮ ╭──────────────────────────────────────────────────────╮
//      KC_LGUI,    KC_Q,    KC_W,    KC_E,    KC_R,    KC_T,       KC_Y,    KC_U,    KC_I,    KC_O,    KC_P, KC_RGUI,
  // ├──────────────────────────────────────────────────────┤ ├──────────────────────────────────────────────────────┤
//      KC_LCTL,    KC_A,    KC_S,    KC_D,    KC_F,    KC_G,       KC_H,    KC_J,    KC_K,    KC_L, KC_SCLN, KC_RCTL,
  // ├──────────────────────────────────────────────────────┤ ├──────────────────────────────────────────────────────┤
  //    KC_LSFT,    KC_Z,    KC_X,    KC_C,    KC_V,    KC_B,       KC_N,    KC_M, KC_COMM,  KC_DOT, KC_SLSH, KC_RSFT,
  // ╰──────────────────────────────────────────────────────┤ ├──────────────────────────────────────────────────────╯
//                                  KC_BSPC,  KC_SPC,   LOWER,      RAISE,  KC_ENT
  //                            ╰───────────────────────────╯ ╰──────────────────╯
  ),

  [LAYER_LOWER] = LAYOUT(


      KC_NO,    KC_MPLY,     KC_HOME,      KC_UP,      KC_END,      KC_PGUP,          KC_LBRC,  RALT(KC_4),         RALT(KC_5),        KC_9,    KC_RBRC,  QK_BOOT,
      CK_STABB, CK_STAB,     KC_LEFT,      KC_DOWN,    KC_RGHT,     KC_PGDN,          KC_GRV,   MT(MOD_LCTL,KC_4),  MT(MOD_LSFT,KC_5), KC_BSPC, KC_PMNS,  KC_NO,
      KC_NO,    KC_TAB,      KC_VOLD,      C(KC_RBRC), KC_LGUI,     KC_F13,           KC_MINS,  RALT(KC_X),         RALT(KC_C),        KC_DEL,  KC_INS,   KC_PSCR,
                                           KC_TRNS,    KC_TRNS,     KC_TRNS,          KC_TRNS,  KC_TRNS

        // ╭──────────────────────────────────────────────────────╮ ╭──────────────────────────────────────────────────────╮
//       XXXXXXX, RGB_TOG, KC_MNXT, KC_MPLY, KC_MPRV, XXXXXXX,    KC_LBRC,    KC_7,    KC_8,    KC_9, KC_RBRC, XXXXXXX,
  // ├──────────────────────────────────────────────────────┤ ├──────────────────────────────────────────────────────┤
//       XXXXXXX, KC_LGUI, KC_LALT, KC_LCTL, KC_LSFT, XXXXXXX,    KC_PPLS,    KC_4,    KC_5,    KC_6, KC_PMNS, XXXXXXX,
  // ├──────────────────────────────────────────────────────┤ ├──────────────────────────────────────────────────────┤
//       XXXXXXX, XXXXXXX, XXXXXXX, XXXXXXX, EE_CLR,  QK_BOOT,    KC_PAST,    KC_1,    KC_2,    KC_3, KC_PSLS, XXXXXXX,
  // ╰──────────────────────────────────────────────────────┤ ├──────────────────────────────────────────────────────╯
//                                  XXXXXXX, XXXXXXX, _______,    XXXXXXX, _______
  //                            ╰───────────────────────────╯ ╰──────────────────╯
  ),

  [LAYER_RAISE] = LAYOUT(


      QK_BOOT,  KC_NO,      DPI_RMOD,  KC_NO,       DPI_MOD,      KC_NO,               KC_NO,      KC_P7,      KC_P8,      KC_P9,      KC_NO,       KC_COMM,
      KC_NO,    SNIPING,    DRGSCRL,   KC_MS_BTN2,  KC_MS_BTN1,   KC_APP,              KC_BSLS,    KC_P4,      KC_P5,      KC_P6,      RALT(KC_2),  RALT(KC_3),
      KC_NO,    SNP_TOG,    DRG_TOG,   KC_MS_BTN3,  KC_WWW_BACK,  KC_WWW_FORWARD,      KC_P0,      KC_P1,      KC_P2,      KC_P3,      C(KC_B),     KC_NO,
                                       KC_TRNS,     KC_TRNS,      KC_NO,               KC_TRNS,    KC_TRNS



//      KC_NO,      KC_MPLY,     KC_HOME,      KC_UP,      KC_END,     KC_PGUP,       KC_LBRC,    RALT(KC_4),         RALT(KC_5),         KC_9,      KC_RBRC,     QK_BOOT,
//      KC_NO,      KC_LGUI,     KC_LEFT,      KC_DOWN,    KC_RGHT,    KC_PGDN,       KC_GRV,     MT(MOD_LCTL,KC_4),  MT(MOD_LSFT,KC_5),  KC_BSPC,   KC_PMNS,     KC_NO,
//      KC_NO,      KC_TAB,      KC_VOLD,      C(KC_RBRC), KC_LGUI,    KC_F13,        KC_MINS,    RALT(KC_X),         RALT(KC_C),         KC_DEL,    KC_INS,      KC_PSCR,
//                                             KC_SPC,     KC_LALT,    KC_RALT,       KC_NO,      LOWER

  // ╭──────────────────────────────────────────────────────╮ ╭──────────────────────────────────────────────────────╮
//       XXXXXXX, XXXXXXX, XXXXXXX, XXXXXXX, XXXXXXX, XXXXXXX,    XXXXXXX, KC_VOLU, KC_MUTE, KC_VOLD, XXXXXXX, XXXXXXX,
  // ├──────────────────────────────────────────────────────┤ ├──────────────────────────────────────────────────────┤
 //      XXXXXXX, KC_LEFT,   KC_UP, KC_DOWN, KC_RGHT, XXXXXXX,    XXXXXXX, KC_RSFT, KC_RCTL, KC_RALT, KC_RGUI, XXXXXXX,
  // ├──────────────────────────────────────────────────────┤ ├──────────────────────────────────────────────────────┤
  //     XXXXXXX, KC_HOME, KC_PGUP, KC_PGDN,  KC_END, XXXXXXX,    QK_BOOT, EE_CLR,  XXXXXXX, XXXXXXX, XXXXXXX, XXXXXXX,
  // ╰──────────────────────────────────────────────────────┤ ├──────────────────────────────────────────────────────╯
//                                  _______, _______, XXXXXXX,    _______, XXXXXXX
  //                            ╰───────────────────────────╯ ╰──────────────────╯
  ),

  [LAYER_POINTER] = LAYOUT(

      QK_BOOT,    KC_F1,   KC_F2,      KC_F3,      KC_F4,      KC_F5,          KC_F6,      KC_F7,      KC_F8,    KC_F9,   KC_F10,      KC_F11,
      KC_GRV,     KC_1,    KC_2,       KC_3,       KC_4,       KC_5,           KC_6,       KC_7,       KC_8,     KC_9,    KC_0,        KC_MINS,
      KC_NO,      KC_NO,   KC_MS_BTN3, KC_MS_BTN2, KC_MS_BTN1, KC_Z,           KC_NO,      KC_NO,      KC_NO,    KC_NO,   KC_EQL,      KC_F12,
                                       KC_MS_BTN3, KC_MS_BTN2, KC_MS_BTN1,     KC_MS_BTN2, KC_MS_BTN1

  // ╭──────────────────────────────────────────────────────╮ ╭──────────────────────────────────────────────────────╮
//       XXXXXXX, XXXXXXX, XXXXXXX, XXXXXXX, DPI_MOD, S_D_MOD,    S_D_MOD, DPI_MOD, XXXXXXX, XXXXXXX, XXXXXXX, XXXXXXX,
  // ├──────────────────────────────────────────────────────┤ ├──────────────────────────────────────────────────────┤
 //      XXXXXXX, KC_LGUI, KC_LALT, KC_LCTL, KC_LSFT, XXXXXXX,    XXXXXXX, KC_RSFT, KC_RCTL, KC_RALT, KC_RGUI, XXXXXXX,
  // ├──────────────────────────────────────────────────────┤ ├──────────────────────────────────────────────────────┤
  //     XXXXXXX, _______, DRGSCRL, SNIPING, EE_CLR,  QK_BOOT,    QK_BOOT, EE_CLR,  SNIPING, DRGSCRL, _______, XXXXXXX,
  // ╰──────────────────────────────────────────────────────┤ ├──────────────────────────────────────────────────────╯
   //                               KC_BTN2, KC_BTN1, KC_BTN3,    KC_BTN3, KC_BTN1
  //                            ╰───────────────────────────╯ ╰──────────────────╯
  ),
  [LAYER_MAJ] = LAYOUT(
  // ╭──────────────────────────────────────────────────────╮ ╭──────────────────────────────────────────────────────╮
       KC_LGUI,    LSFT(KC_Q),    LSFT(KC_W),    LSFT(KC_E),    LSFT(KC_R),    LSFT(KC_T),       LSFT(KC_Y),    LSFT(KC_U),    LSFT(KC_I),    LSFT(KC_O),    LSFT(KC_P), LSFT(KC_LBRC),
  // ├──────────────────────────────────────────────────────┤ ├──────────────────────────────────────────────────────┤
       KC_LCTL,    LSFT(KC_A),    LSFT(KC_S),    LSFT(KC_D),    LSFT(KC_F),    LSFT(KC_G),       LSFT(KC_H),    LSFT(KC_J),    LSFT(KC_K),    LSFT(KC_L), LSFT(KC_SCLN), LSFT(KC_QUOT),
  // ├──────────────────────────────────────────────────────┤ ├──────────────────────────────────────────────────────┤
       KC_LSFT,    LSFT(KC_RBRC),    LSFT(KC_X),    LSFT(KC_C),    LSFT(KC_V),    LSFT(KC_B),       LSFT(KC_N),    LSFT(KC_M), LSFT(KC_COMM),  LSFT(KC_DOT), LSFT(KC_SLSH), KC_RSFT,
  // ╰──────────────────────────────────────────────────────┤ ├──────────────────────────────────────────────────────╯
                                  KC_BSPC,  KC_SPC,   LOWER,      RAISE,  KC_ENT
  //                            ╰───────────────────────────╯ ╰──────────────────╯
  ),
  [LAYER_GAME] = LAYOUT(
  // ╭──────────────────────────────────────────────────────╮ ╭──────────────────────────────────────────────────────╮
       KC_TAB,     KC_T,    KC_Q,    KC_W,    KC_E,    KC_R,        KC_Y,    KC_U,    EE_CLR,    KC_O,    KC_P, TO(0),
  // ├──────────────────────────────────────────────────────┤ ├──────────────────────────────────────────────────────┤
       KC_ESC,     KC_LSFT, KC_A,    KC_S,    KC_D,    KC_F,      KC_H,    KC_J,    KC_K,    KC_L, KC_SCLN, KC_RCTL,
  // ├──────────────────────────────────────────────────────┤ ├──────────────────────────────────────────────────────┤
       KC_LSFT,    KC_G,    KC_X,    KC_C,    KC_V, KC_B,    KC_N,    KC_M, KC_COMM,  KC_DOT, DRGSCRL, KC_RSFT,
  // ╰──────────────────────────────────────────────────────┤ ├──────────────────────────────────────────────────────╯
                                  KC_SPC,  KC_LCTL, KC_LALT,    KC_MS_BTN2,  KC_MS_BTN1
  //                            ╰───────────────────────────╯ ╰──────────────────╯
  ),
};

static bool isAltSetBySpecialTab = false;

void unregister_alt_after_special_tab_used(void) {
  uint8_t layer = biton32(layer_state);
  bool exited_layer = layer == LAYER_BASE || layer == LAYER_GAME;
  if (exited_layer && isAltSetBySpecialTab) {
    unregister_mods(MOD_LALT);
    isAltSetBySpecialTab = false;
  }
};

static uint16_t lower_key_timer;
static uint16_t raise_key_timer;
static bool is_other_key_pressed = false;


bool process_record_user(uint16_t keycode, keyrecord_t *record) {
  unregister_alt_after_special_tab_used();
  bool lalt_on = get_mods() & MOD_BIT(KC_LALT);
  bool is_shift_on = get_mods() & MOD_BIT(KC_LSFT);
  if (record->event.pressed && keycode != LOWER ) {
    is_other_key_pressed = true;
  }

  switch (keycode) {
    case CK_STAB:
      if (record->event.pressed) {
        if (!lalt_on) {
            register_mods(MOD_LALT);
            isAltSetBySpecialTab = true;
        }
        register_code(KC_TAB);
        unregister_code(KC_TAB);
      }
      return false;
      break;
    case CK_STABB:
      if (record->event.pressed) {
        if (!lalt_on) {
            register_mods(MOD_LALT);
            isAltSetBySpecialTab = true;
        }
        if (!is_shift_on) {
          register_mods(MOD_LSFT);
        }
        register_code(KC_TAB);
        unregister_code(KC_TAB);
        if (!is_shift_on) {
          unregister_mods(MOD_LSFT);
        }
      }
      return false;
      break;
    case LOWER:
      if (record->event.pressed) {
        // Key pressed: start timer and reset other key flag
        lower_key_timer = timer_read();
        is_other_key_pressed = false;
        layer_on(LAYER_LOWER);
        update_tri_layer(LAYER_LOWER, LAYER_RAISE, LAYER_MAJ);
      } else {
        if (!is_other_key_pressed && timer_elapsed(lower_key_timer) < 200) {
            // Send mouse click
            tap_code(KC_MS_BTN1);
            layer_off(LAYER_LOWER);
        } else {
            layer_off(LAYER_LOWER);
            update_tri_layer(LAYER_LOWER, LAYER_RAISE, LAYER_MAJ);
        }
      }
      return false;
    case RAISE:
      if (record->event.pressed) {
        raise_key_timer = timer_read();
        is_other_key_pressed = false;
        layer_on(LAYER_RAISE);
        update_tri_layer(LAYER_RAISE, LAYER_LOWER, LAYER_MAJ);
      } else {
        if (!is_other_key_pressed && timer_elapsed(raise_key_timer) < 200) {
            tap_code(KC_MS_BTN1);
            layer_off(LAYER_RAISE);
        } else {
            layer_off(LAYER_RAISE);
            update_tri_layer(LAYER_RAISE, LAYER_LOWER, LAYER_MAJ);
        }
      }
      return false;
    }
  return true;
}

/*layer_state_t layer_state_set_user(layer_state_t state) {

    //static bool has_layer_changed = true;
    uint8_t layer = get_highest_layer(state);

    if ((layer == LAYER_BASE || layer == LAYER_GAME) && isAltSetBySpecialTab) {
        isAltSetBySpecialTab = false;
        unregister_mods(MOD_LALT);
    }

    if (layer != current_layer) {
     //   has_layer_changed = true;
        current_layer = layer;
    }
    return state;

}*/
    //
// clang-format on

#ifdef POINTING_DEVICE_ENABLE
#    ifdef CHARYBDIS_AUTO_POINTER_LAYER_TRIGGER_ENABLE
report_mouse_t pointing_device_task_user(report_mouse_t mouse_report) {
    if (abs(mouse_report.x) > CHARYBDIS_AUTO_POINTER_LAYER_TRIGGER_THRESHOLD || abs(mouse_report.y) > CHARYBDIS_AUTO_POINTER_LAYER_TRIGGER_THRESHOLD) {
        if (auto_pointer_layer_timer == 0) {
            layer_on(LAYER_POINTER);
#        ifdef RGB_MATRIX_ENABLE
            rgb_matrix_mode_noeeprom(RGB_MATRIX_NONE);
            rgb_matrix_sethsv_noeeprom(HSV_GREEN);
#        endif // RGB_MATRIX_ENABLE
        }
        auto_pointer_layer_timer = timer_read();
    }
    return mouse_report;
}

void matrix_scan_user(void) {
    if (auto_pointer_layer_timer != 0 && TIMER_DIFF_16(timer_read(), auto_pointer_layer_timer) >= CHARYBDIS_AUTO_POINTER_LAYER_TRIGGER_TIMEOUT_MS) {
        auto_pointer_layer_timer = 0;
        layer_off(LAYER_POINTER);
#        ifdef RGB_MATRIX_ENABLE
        rgb_matrix_mode_noeeprom(RGB_MATRIX_DEFAULT_MODE);
#        endif // RGB_MATRIX_ENABLE
    }
}
#    endif // CHARYBDIS_AUTO_POINTER_LAYER_TRIGGER_ENABLE

#    ifdef CHARYBDIS_AUTO_SNIPING_ON_LAYER
layer_state_t layer_state_set_user(layer_state_t state) {
    charybdis_set_pointer_sniping_enabled(layer_state_cmp(state, CHARYBDIS_AUTO_SNIPING_ON_LAYER));

    uint8_t layer = get_highest_layer(state);

    if ((layer == LAYER_BASE || layer == LAYER_GAME) && isAltSetBySpecialTab) {
        isAltSetBySpecialTab = false;
        unregister_mods(MOD_LALT);
    }

    if (layer != current_layer) {
     //   has_layer_changed = true;
        current_layer = layer;
    }

    return state;
}
#    endif // CHARYBDIS_AUTO_SNIPING_ON_LAYER
#endif     // POINTING_DEVICE_ENABLE

#ifdef RGB_MATRIX_ENABLE
// Forward-declare this helper function since it is defined in rgb_matrix.c.
void rgb_matrix_update_pwm_buffers(void);
#endif
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