qmk-firmware/quantum/process_keycode/process_auto_shift.c

/* Copyright 2017 Jeremy Cowgar
 *
 * 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/>.
 */

#ifdef AUTO_SHIFT_ENABLE

#    include <stdio.h>

#    include "process_auto_shift.h"

#    define TAP(key)        \
        register_code(key); \
        unregister_code(key)

#    define TAP_WITH_MOD(mod, key) \
        register_code(mod);        \
        register_code(key);        \
        unregister_code(key);      \
        unregister_code(mod)

uint16_t autoshift_time    = 0;
uint16_t autoshift_timeout = AUTO_SHIFT_TIMEOUT;
uint16_t autoshift_lastkey = KC_NO;

void autoshift_timer_report(void) {
    char display[8];

    snprintf(display, 8, "\n%d\n", autoshift_timeout);

    send_string((const char *)display);
}

void autoshift_on(uint16_t keycode) {
    autoshift_time    = timer_read();
    autoshift_lastkey = keycode;
}

void autoshift_flush(void) {
    if (autoshift_lastkey != KC_NO) {
        uint16_t elapsed = timer_elapsed(autoshift_time);

        if (elapsed > autoshift_timeout) {
            register_code(KC_LSFT);
        }

        register_code(autoshift_lastkey);
        unregister_code(autoshift_lastkey);

        if (elapsed > autoshift_timeout) {
            unregister_code(KC_LSFT);
        }

        autoshift_time    = 0;
        autoshift_lastkey = KC_NO;
    }
}

bool autoshift_enabled = true;

void autoshift_enable(void) { autoshift_enabled = true; }
void autoshift_disable(void) {
    autoshift_enabled = false;
    autoshift_flush();
}

void autoshift_toggle(void) {
    if (autoshift_enabled) {
        autoshift_enabled = false;
        autoshift_flush();
    } else {
        autoshift_enabled = true;
    }
}

bool autoshift_state(void) { return autoshift_enabled; }

bool process_auto_shift(uint16_t keycode, keyrecord_t *record) {
#    ifndef AUTO_SHIFT_MODIFIERS
    static uint8_t any_mod_pressed;
#    endif

    if (record->event.pressed) {
        switch (keycode) {
            case KC_ASUP:
                autoshift_timeout += 5;
                return false;

            case KC_ASDN:
                autoshift_timeout -= 5;
                return false;

            case KC_ASRP:
                autoshift_timer_report();
                return false;

            case KC_ASTG:
                autoshift_toggle();
                return false;
            case KC_ASON:
                autoshift_enable();
                return false;
            case KC_ASOFF:
                autoshift_disable();
                return false;

#    ifndef NO_AUTO_SHIFT_ALPHA
            case KC_A:
            case KC_B:
            case KC_C:
            case KC_D:
            case KC_E:
            case KC_F:
            case KC_G:
            case KC_H:
            case KC_I:
            case KC_J:
            case KC_K:
            case KC_L:
            case KC_M:
            case KC_N:
            case KC_O:
            case KC_P:
            case KC_Q:
            case KC_R:
            case KC_S:
            case KC_T:
            case KC_U:
            case KC_V:
            case KC_W:
            case KC_X:
            case KC_Y:
            case KC_Z:
#    endif
#    ifndef NO_AUTO_SHIFT_NUMERIC
            case KC_1:
            case KC_2:
            case KC_3:
            case KC_4:
            case KC_5:
            case KC_6:
            case KC_7:
            case KC_8:
            case KC_9:
            case KC_0:
#    endif
#    ifndef NO_AUTO_SHIFT_SPECIAL
            case KC_MINUS:
            case KC_EQL:
            case KC_TAB:
            case KC_LBRC:
            case KC_RBRC:
            case KC_BSLS:
            case KC_SCLN:
            case KC_QUOT:
            case KC_COMM:
            case KC_DOT:
            case KC_SLSH:
            case KC_GRAVE:
            case KC_NONUS_BSLASH:
            case KC_NONUS_HASH:
#    endif

                autoshift_flush();
                if (!autoshift_enabled) return true;

#    ifndef AUTO_SHIFT_MODIFIERS
                any_mod_pressed = get_mods() & (MOD_BIT(KC_LGUI) | MOD_BIT(KC_RGUI) | MOD_BIT(KC_LALT) | MOD_BIT(KC_RALT) | MOD_BIT(KC_LCTL) | MOD_BIT(KC_RCTL) | MOD_BIT(KC_LSFT) | MOD_BIT(KC_RSFT));

                if (any_mod_pressed) {
                    return true;
                }
#    endif

                autoshift_on(keycode);
                return false;

            default:
                autoshift_flush();
                return true;
        }
    } else {
        autoshift_flush();
    }

    return true;
}

#endif