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diff --git a/quantum/unicode/unicode.c b/quantum/unicode/unicode.c
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+/* Copyright 2022
+ *
+ * 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 "unicode.h"
+
+#include "eeprom.h"
+#include "eeconfig.h"
+#include "action.h"
+#include "action_util.h"
+#include "host.h"
+#include "keycode.h"
+#include "wait.h"
+#include "audio.h"
+#include "send_string.h"
+#include "utf8.h"
+
+#if defined(UNICODE_ENABLE) + defined(UNICODEMAP_ENABLE) + defined(UCIS_ENABLE) > 1
+# error "Cannot enable more than one Unicode method (UNICODE, UNICODEMAP, UCIS) at the same time"
+#endif
+
+// Keycodes used for starting Unicode input on different platforms
+#ifndef UNICODE_KEY_MAC
+# define UNICODE_KEY_MAC KC_LEFT_ALT
+#endif
+#ifndef UNICODE_KEY_LNX
+# define UNICODE_KEY_LNX LCTL(LSFT(KC_U))
+#endif
+#ifndef UNICODE_KEY_WINC
+# define UNICODE_KEY_WINC KC_RIGHT_ALT
+#endif
+
+// Comma-delimited, ordered list of input modes selected for use (e.g. in cycle)
+// Example: #define UNICODE_SELECTED_MODES UC_WINC, UC_LNX
+#ifndef UNICODE_SELECTED_MODES
+# define UNICODE_SELECTED_MODES -1
+#endif
+
+// Whether input mode changes in cycle should be written to EEPROM
+#ifndef UNICODE_CYCLE_PERSIST
+# define UNICODE_CYCLE_PERSIST true
+#endif
+
+// Delay between starting Unicode input and sending a sequence, in ms
+#ifndef UNICODE_TYPE_DELAY
+# define UNICODE_TYPE_DELAY 10
+#endif
+
+unicode_config_t unicode_config;
+uint8_t unicode_saved_mods;
+led_t unicode_saved_led_state;
+
+#if UNICODE_SELECTED_MODES != -1
+static uint8_t selected[] = {UNICODE_SELECTED_MODES};
+static int8_t selected_count = ARRAY_SIZE(selected);
+static int8_t selected_index;
+#endif
+
+/** \brief unicode input mode set at user level
+ *
+ * Run user code on unicode input mode change
+ */
+__attribute__((weak)) void unicode_input_mode_set_user(uint8_t input_mode) {}
+
+/** \brief unicode input mode set at keyboard level
+ *
+ * Run keyboard code on unicode input mode change
+ */
+__attribute__((weak)) void unicode_input_mode_set_kb(uint8_t input_mode) {
+ unicode_input_mode_set_user(input_mode);
+}
+
+#ifdef AUDIO_ENABLE
+# ifdef UNICODE_SONG_MAC
+static float song_mac[][2] = UNICODE_SONG_MAC;
+# endif
+# ifdef UNICODE_SONG_LNX
+static float song_lnx[][2] = UNICODE_SONG_LNX;
+# endif
+# ifdef UNICODE_SONG_WIN
+static float song_win[][2] = UNICODE_SONG_WIN;
+# endif
+# ifdef UNICODE_SONG_BSD
+static float song_bsd[][2] = UNICODE_SONG_BSD;
+# endif
+# ifdef UNICODE_SONG_WINC
+static float song_winc[][2] = UNICODE_SONG_WINC;
+# endif
+# ifdef UNICODE_SONG_EMACS
+static float song_emacs[][2] = UNICODE_SONG_EMACS;
+# endif
+
+static void unicode_play_song(uint8_t mode) {
+ switch (mode) {
+# ifdef UNICODE_SONG_MAC
+ case UC_MAC:
+ PLAY_SONG(song_mac);
+ break;
+# endif
+# ifdef UNICODE_SONG_LNX
+ case UC_LNX:
+ PLAY_SONG(song_lnx);
+ break;
+# endif
+# ifdef UNICODE_SONG_WIN
+ case UC_WIN:
+ PLAY_SONG(song_win);
+ break;
+# endif
+# ifdef UNICODE_SONG_BSD
+ case UC_BSD:
+ PLAY_SONG(song_bsd);
+ break;
+# endif
+# ifdef UNICODE_SONG_WINC
+ case UC_WINC:
+ PLAY_SONG(song_winc);
+ break;
+# endif
+# ifdef UNICODE_SONG_EMACS
+ case UC_EMACS:
+ PLAY_SONG(song_emacs);
+ break;
+# endif
+ }
+}
+#endif
+
+void unicode_input_mode_init(void) {
+ unicode_config.raw = eeprom_read_byte(EECONFIG_UNICODEMODE);
+#if UNICODE_SELECTED_MODES != -1
+# if UNICODE_CYCLE_PERSIST
+ // Find input_mode in selected modes
+ int8_t i;
+ for (i = 0; i < selected_count; i++) {
+ if (selected[i] == unicode_config.input_mode) {
+ selected_index = i;
+ break;
+ }
+ }
+ if (i == selected_count) {
+ // Not found: input_mode isn't selected, change to one that is
+ unicode_config.input_mode = selected[selected_index = 0];
+ }
+# else
+ // Always change to the first selected input mode
+ unicode_config.input_mode = selected[selected_index = 0];
+# endif
+#endif
+ unicode_input_mode_set_kb(unicode_config.input_mode);
+ dprintf("Unicode input mode init to: %u\n", unicode_config.input_mode);
+}
+
+uint8_t get_unicode_input_mode(void) {
+ return unicode_config.input_mode;
+}
+
+void set_unicode_input_mode(uint8_t mode) {
+ unicode_config.input_mode = mode;
+ persist_unicode_input_mode();
+#ifdef AUDIO_ENABLE
+ unicode_play_song(mode);
+#endif
+ unicode_input_mode_set_kb(mode);
+ dprintf("Unicode input mode set to: %u\n", unicode_config.input_mode);
+}
+
+void cycle_unicode_input_mode(int8_t offset) {
+#if UNICODE_SELECTED_MODES != -1
+ selected_index = (selected_index + offset) % selected_count;
+ if (selected_index < 0) {
+ selected_index += selected_count;
+ }
+ unicode_config.input_mode = selected[selected_index];
+# if UNICODE_CYCLE_PERSIST
+ persist_unicode_input_mode();
+# endif
+# ifdef AUDIO_ENABLE
+ unicode_play_song(unicode_config.input_mode);
+# endif
+ unicode_input_mode_set_kb(unicode_config.input_mode);
+ dprintf("Unicode input mode cycle to: %u\n", unicode_config.input_mode);
+#endif
+}
+
+void persist_unicode_input_mode(void) {
+ eeprom_update_byte(EECONFIG_UNICODEMODE, unicode_config.input_mode);
+}
+
+__attribute__((weak)) void unicode_input_start(void) {
+ unicode_saved_led_state = host_keyboard_led_state();
+
+ // Note the order matters here!
+ // Need to do this before we mess around with the mods, or else
+ // UNICODE_KEY_LNX (which is usually Ctrl-Shift-U) might not work
+ // correctly in the shifted case.
+ if (unicode_config.input_mode == UC_LNX && unicode_saved_led_state.caps_lock) {
+ tap_code(KC_CAPS_LOCK);
+ }
+
+ unicode_saved_mods = get_mods(); // Save current mods
+ clear_mods(); // Unregister mods to start from a clean state
+ clear_weak_mods();
+
+ switch (unicode_config.input_mode) {
+ case UC_MAC:
+ register_code(UNICODE_KEY_MAC);
+ break;
+ case UC_LNX:
+ tap_code16(UNICODE_KEY_LNX);
+ break;
+ case UC_WIN:
+ // For increased reliability, use numpad keys for inputting digits
+ if (!unicode_saved_led_state.num_lock) {
+ tap_code(KC_NUM_LOCK);
+ }
+ register_code(KC_LEFT_ALT);
+ wait_ms(UNICODE_TYPE_DELAY);
+ tap_code(KC_KP_PLUS);
+ break;
+ case UC_WINC:
+ tap_code(UNICODE_KEY_WINC);
+ tap_code(KC_U);
+ break;
+ case UC_EMACS:
+ // The usual way to type unicode in emacs is C-x-8 <RET> then the unicode number in hex
+ tap_code16(LCTL(KC_X));
+ tap_code16(KC_8);
+ tap_code16(KC_ENTER);
+ break;
+ }
+
+ wait_ms(UNICODE_TYPE_DELAY);
+}
+
+__attribute__((weak)) void unicode_input_finish(void) {
+ switch (unicode_config.input_mode) {
+ case UC_MAC:
+ unregister_code(UNICODE_KEY_MAC);
+ break;
+ case UC_LNX:
+ tap_code(KC_SPACE);
+ if (unicode_saved_led_state.caps_lock) {
+ tap_code(KC_CAPS_LOCK);
+ }
+ break;
+ case UC_WIN:
+ unregister_code(KC_LEFT_ALT);
+ if (!unicode_saved_led_state.num_lock) {
+ tap_code(KC_NUM_LOCK);
+ }
+ break;
+ case UC_WINC:
+ tap_code(KC_ENTER);
+ break;
+ case UC_EMACS:
+ tap_code16(KC_ENTER);
+ break;
+ }
+
+ set_mods(unicode_saved_mods); // Reregister previously set mods
+}
+
+__attribute__((weak)) void unicode_input_cancel(void) {
+ switch (unicode_config.input_mode) {
+ case UC_MAC:
+ unregister_code(UNICODE_KEY_MAC);
+ break;
+ case UC_LNX:
+ tap_code(KC_ESCAPE);
+ if (unicode_saved_led_state.caps_lock) {
+ tap_code(KC_CAPS_LOCK);
+ }
+ break;
+ case UC_WINC:
+ tap_code(KC_ESCAPE);
+ break;
+ case UC_WIN:
+ unregister_code(KC_LEFT_ALT);
+ if (!unicode_saved_led_state.num_lock) {
+ tap_code(KC_NUM_LOCK);
+ }
+ break;
+ case UC_EMACS:
+ tap_code16(LCTL(KC_G)); // C-g cancels
+ break;
+ }
+
+ set_mods(unicode_saved_mods); // Reregister previously set mods
+}
+
+// clang-format off
+
+static void send_nibble_wrapper(uint8_t digit) {
+ if (unicode_config.input_mode == UC_WIN) {
+ uint8_t kc = digit < 10
+ ? KC_KP_1 + (10 + digit - 1) % 10
+ : KC_A + (digit - 10);
+ tap_code(kc);
+ return;
+ }
+ send_nibble(digit);
+}
+
+// clang-format on
+
+void register_hex(uint16_t hex) {
+ for (int i = 3; i >= 0; i--) {
+ uint8_t digit = ((hex >> (i * 4)) & 0xF);
+ send_nibble_wrapper(digit);
+ }
+}
+
+void register_hex32(uint32_t hex) {
+ bool onzerostart = true;
+ for (int i = 7; i >= 0; i--) {
+ if (i <= 3) {
+ onzerostart = false;
+ }
+ uint8_t digit = ((hex >> (i * 4)) & 0xF);
+ if (digit == 0) {
+ if (!onzerostart) {
+ send_nibble_wrapper(digit);
+ }
+ } else {
+ send_nibble_wrapper(digit);
+ onzerostart = false;
+ }
+ }
+}
+
+void register_unicode(uint32_t code_point) {
+ if (code_point > 0x10FFFF || (code_point > 0xFFFF && unicode_config.input_mode == UC_WIN)) {
+ // Code point out of range, do nothing
+ return;
+ }
+
+ unicode_input_start();
+ if (code_point > 0xFFFF && unicode_config.input_mode == UC_MAC) {
+ // Convert code point to UTF-16 surrogate pair on macOS
+ code_point -= 0x10000;
+ uint32_t lo = code_point & 0x3FF, hi = (code_point & 0xFFC00) >> 10;
+ register_hex32(hi + 0xD800);
+ register_hex32(lo + 0xDC00);
+ } else {
+ register_hex32(code_point);
+ }
+ unicode_input_finish();
+}
+
+void send_unicode_string(const char *str) {
+ if (!str) {
+ return;
+ }
+
+ while (*str) {
+ int32_t code_point = 0;
+ str = decode_utf8(str, &code_point);
+
+ if (code_point >= 0) {
+ register_unicode(code_point);
+ }
+ }
+}