qmk_firmware/keyboards/atreus/keymaps/default/keymap.c

#include QMK_KEYBOARD_H

#include "oneshot.h"

#define LA_SYM MO(SYM)
#define LA_NAV MO(NAV)

enum layers {
    DEF,
    SYM,
    NAV,
    NUM,
};

enum keycodes {
    // Custom oneshot mod implementation with no timers.
    OS_SHFT = SAFE_RANGE,
    OS_CTRL,
    OS_ALT,
    OS_CMD,
};

const uint16_t PROGMEM keymaps[][MATRIX_ROWS][MATRIX_COLS] = {
    [DEF] = LAYOUT(
        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,   XXXXXXX,XXXXXXX,KC_N,   KC_M,   KC_COMM,KC_DOT, KC_SLSH,
        XXXXXXX,XXXXXXX,XXXXXXX,LA_NAV, KC_BSPC,XXXXXXX,XXXXXXX,KC_SPC, LA_SYM, XXXXXXX,XXXXXXX,XXXXXXX
    ),

    [SYM] = LAYOUT(
        KC_ESC, KC_LBRC,KC_LCBR,KC_LPRN,KC_TILD,                KC_CIRC,KC_RPRN,KC_RCBR,KC_RBRC,KC_GRV,
        KC_MINS,KC_ASTR,KC_EQL, KC_UNDS,KC_DLR,                 KC_HASH,OS_CMD, OS_ALT, OS_CTRL,OS_SHFT,
        KC_PLUS,KC_PIPE,KC_AT,  KC_SLSH,KC_PERC,XXXXXXX,XXXXXXX,XXXXXXX,KC_BSLS,KC_AMPR,KC_QUES,KC_EXLM,
        XXXXXXX,XXXXXXX,XXXXXXX,_______,_______,XXXXXXX,XXXXXXX,_______,_______,XXXXXXX,XXXXXXX,XXXXXXX
    ),

    [NAV] = LAYOUT(
        KC_TAB, XXXXXXX,XXXXXXX,XXXXXXX,XXXXXXX,                RESET,  KC_CAPS,XXXXXXX,XXXXXXX,RESET,
        OS_SHFT,OS_CTRL,OS_ALT, OS_CMD, XXXXXXX,                KC_LEFT,KC_DOWN,KC_UP,  KC_RGHT,KC_BSPC,
        XXXXXXX,XXXXXXX,XXXXXXX,XXXXXXX,XXXXXXX,_______,_______,XXXXXXX,KC_PGDN,KC_PGUP,XXXXXXX,KC_ENT,
        XXXXXXX,XXXXXXX,XXXXXXX,_______,_______,XXXXXXX,XXXXXXX,_______,_______,XXXXXXX,XXXXXXX,XXXXXXX
    ),

    [NUM] = LAYOUT(
        KC_1,   KC_2,   KC_3,   KC_4,   KC_5,                   KC_6,   KC_7,   KC_8,   KC_9,   KC_0,
        OS_SHFT,OS_CTRL,OS_ALT, OS_CMD, KC_F11,                 KC_F12, OS_CMD, OS_ALT, OS_CTRL,OS_SHFT,
        KC_F1,  KC_F2,  KC_F3,  KC_F4,  KC_F5,  _______,_______,KC_F6,  KC_F7,  KC_F8,  KC_F9,  KC_F10,
        XXXXXXX,XXXXXXX,XXXXXXX,_______,_______,XXXXXXX,XXXXXXX,_______,_______,XXXXXXX,XXXXXXX,XXXXXXX
    )
};

bool is_oneshot_cancel_key(uint16_t keycode) {
    switch (keycode) {
    case LA_SYM:
    case LA_NAV:
        return true;
    default:
        return false;
    }
}

bool is_oneshot_ignored_key(uint16_t keycode) {
    switch (keycode) {
    case LA_SYM:
    case LA_NAV:
    case KC_LSFT:
    case OS_SHFT:
    case OS_CTRL:
    case OS_ALT:
    case OS_CMD:
        return true;
    default:
        return false;
    }
}

oneshot_state os_shft_state = os_up_unqueued;
oneshot_state os_ctrl_state = os_up_unqueued;
oneshot_state os_alt_state = os_up_unqueued;
oneshot_state os_cmd_state = os_up_unqueued;

bool process_record_user(uint16_t keycode, keyrecord_t *record) {
    update_oneshot(
        &os_shft_state, KC_LSFT, OS_SHFT,
        keycode, record
    );
    update_oneshot(
        &os_ctrl_state, KC_LCTL, OS_CTRL,
        keycode, record
    );
    update_oneshot(
        &os_alt_state, KC_LALT, OS_ALT,
        keycode, record
    );
    update_oneshot(
        &os_cmd_state, KC_LCMD, OS_CMD,
        keycode, record
    );

    return true;
}

layer_state_t layer_state_set_user(layer_state_t state) {
    return update_tri_layer_state(state, SYM, NAV, NUM);
}