Add Serbian keymaps and sendstring LUT (#8560)

* Add Serbian keymaps and sendstring LUT

* Apply suggestions from code review

Co-Authored-By: Konstantin Đorđević <vomindoraan@gmail.com>

* Fix formatting

Co-authored-by: Konstantin Đorđević <vomindoraan@gmail.com>

1 files changed, 136 insertions, 0 deletions

diff --git a/quantum/keymap_extras/keymap_serbian.h b/quantum/keymap_extras/keymap_serbian.h
new file mode 100644
index 0000000000..3cde5820af
--- /dev/null
+++ b/quantum/keymap_extras/keymap_serbian.h
@@ -0,0 +1,136 @@
+/* Copyright 2020
+ *
+ * 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/>.
+ */
+
+#pragma once
+
+#include "keymap.h"
+
+// clang-format off
+
+/*
+ * ┌───┬───┬───┬───┬───┬───┬───┬───┬───┬───┬───┬───┬───┬───────┐
+ * │ ` │ 1 │ 2 │ 3 │ 4 │ 5 │ 6 │ 7 │ 8 │ 9 │ 0 │ ' │ + │       │
+ * ├───┴─┬─┴─┬─┴─┬─┴─┬─┴─┬─┴─┬─┴─┬─┴─┬─┴─┬─┴─┬─┴─┬─┴─┬─┴─┬─────┤
+ * │     │ Љ │ Њ │ Е │ Р │ Т │ З │ У │ И │ О │ П │ Ш │ Ђ │     │
+ * ├─────┴┬──┴┬──┴┬──┴┬──┴┬──┴┬──┴┬──┴┬──┴┬──┴┬──┴┬──┴┬──┴┐    │
+ * │      │ А │ С │ Д │ Ф │ Г │ Х │ Ј │ К │ Л │ Ч │ Ћ │ Ж │    │
+ * ├────┬─┴─┬─┴─┬─┴─┬─┴─┬─┴─┬─┴─┬─┴─┬─┴─┬─┴─┬─┴─┬─┴─┬─┴───┴────┤
+ * │    │ < │ Ѕ │ Џ │ Ц │ В │ Б │ Н │ М │ , │ . │ - │          │
+ * ├────┼───┴┬──┴─┬─┴───┴───┴───┴───┴───┴──┬┴───┼───┴┬────┬────┤
+ * │    │    │    │                        │    │    │    │    │
+ * └────┴────┴────┴────────────────────────┴────┴────┴────┴────┘
+ */
+// Row 1
+#define RS_GRV  KC_GRV  // `
+#define RS_1    KC_1    // 1
+#define RS_2    KC_2    // 2
+#define RS_3    KC_3    // 3
+#define RS_4    KC_4    // 4
+#define RS_5    KC_5    // 5
+#define RS_6    KC_6    // 6
+#define RS_7    KC_7    // 7
+#define RS_8    KC_8    // 8
+#define RS_9    KC_9    // 9
+#define RS_0    KC_0    // 0
+#define RS_QUOT KC_MINS // ' (dead)
+#define RS_PLUS KC_EQL  // +
+// Row 2
+#define RS_LJE  KC_Q    // Љ
+#define RS_NJE  KC_W    // Њ
+#define RS_IE   KC_E    // Е
+#define RS_ER   KC_R    // Р
+#define RS_TE   KC_T    // Т
+#define RS_ZE   KC_Y    // З
+#define RS_U    KC_U    // У
+#define RS_I    KC_I    // И
+#define RS_O    KC_O    // О
+#define RS_PE   KC_P    // П
+#define RS_SHA  KC_LBRC // Ш
+#define RS_DJE  KC_RBRC // Ђ
+// Row 3
+#define RS_A    KC_A    // А
+#define RS_ES   KC_S    // С
+#define RS_DE   KC_D    // Д
+#define RS_EF   KC_F    // Ф
+#define RS_GHE  KC_G    // Г
+#define RS_HA   KC_H    // Х
+#define RS_JE   KC_J    // Ј
+#define RS_KA   KC_K    // К
+#define RS_EL   KC_L    // Л
+#define RS_CHE  KC_SCLN // Ч
+#define RS_TSHE KC_QUOT // Ћ
+#define RS_ZHE  KC_NUHS // Ж
+// Row 4
+#define RS_LABK KC_NUBS // <
+#define RS_DZE  KC_Z    // Ѕ
+#define RS_DZHE KC_X    // Џ
+#define RS_TSE  KC_C    // Ц
+#define RS_VE   KC_V    // В
+#define RS_BE   KC_B    // Б
+#define RS_EN   KC_N    // Н
+#define RS_EM   KC_M    // М
+#define RS_COMM KC_COMM // ,
+#define RS_DOT  KC_DOT  // .
+#define RS_MINS KC_SLSH // -
+
+/* Shifted symbols
+ * ┌───┬───┬───┬───┬───┬───┬───┬───┬───┬───┬───┬───┬───┬───────┐
+ * │ ~ │ ! │ " │ # │ $ │ % │ & │ / │ ( │ ) │ = │ ? │ * │       │
+ * ├───┴─┬─┴─┬─┴─┬─┴─┬─┴─┬─┴─┬─┴─┬─┴─┬─┴─┬─┴─┬─┴─┬─┴─┬─┴─┬─────┤
+ * │     │   │   │   │   │   │   │   │   │   │   │   │   │     │
+ * ├─────┴┬──┴┬──┴┬──┴┬──┴┬──┴┬──┴┬──┴┬──┴┬──┴┬──┴┬──┴┬──┴┐    │
+ * │      │   │   │   │   │   │   │   │   │   │   │   │   │    │
+ * ├────┬─┴─┬─┴─┬─┴─┬─┴─┬─┴─┬─┴─┬─┴─┬─┴─┬─┴─┬─┴─┬─┴─┬─┴───┴────┤
+ * │    │ > │   │   │   │   │   │   │   │ ; │ : │ _ │          │
+ * ├────┼───┴┬──┴─┬─┴───┴───┴───┴───┴───┴──┬┴───┼───┴┬────┬────┤
+ * │    │    │    │                        │    │    │    │    │
+ * └────┴────┴────┴────────────────────────┴────┴────┴────┴────┘
+ */
+// Row 1
+#define RS_TILD S(RS_GRV)  // ~
+#define RS_EXLM S(RS_1)    // !
+#define RS_DQUO S(RS_2)    // "
+#define RS_HASH S(RS_3)    // #
+#define RS_DLR  S(RS_4)    // $
+#define RS_PERC S(RS_5)    // %
+#define RS_AMPR S(RS_6)    // &
+#define RS_SLSH S(RS_7)    // /
+#define RS_LPRN S(RS_8)    // (
+#define RS_RPRN S(RS_9)    // )
+#define RS_EQL  S(RS_0)    // =
+#define RS_DEG  S(RS_QUOT) // ?
+#define RS_UNDS S(RS_PLUS) // *
+// Row 4
+#define RS_RABK S(RS_LABK) // >
+#define RS_SCLN S(RS_COMM) // ;
+#define RS_COLN S(RS_DOT)  // :
+#define RS_UNDS S(RS_MINS) // _
+
+/* AltGr symbols
+ * ┌───┬───┬───┬───┬───┬───┬───┬───┬───┬───┬───┬───┬───┬───────┐
+ * │   │   │   │   │   │   │   │   │   │   │   │   │   │       │
+ * ├───┴─┬─┴─┬─┴─┬─┴─┬─┴─┬─┴─┬─┴─┬─┴─┬─┴─┬─┴─┬─┴─┬─┴─┬─┴─┬─────┤
+ * │     │   │   │ € │   │   │   │   │   │   │   │   │   │     │
+ * ├─────┴┬──┴┬──┴┬──┴┬──┴┬──┴┬──┴┬──┴┬──┴┬──┴┬──┴┬──┴┬──┴┐    │
+ * │      │   │   │   │   │   │   │   │   │   │   │   │   │    │
+ * ├────┬─┴─┬─┴─┬─┴─┬─┴─┬─┴─┬─┴─┬─┴─┬─┴─┬─┴─┬─┴─┬─┴─┬─┴───┴────┤
+ * │    │   │   │   │   │   │   │   │   │   │   │   │          │
+ * ├────┼───┴┬──┴─┬─┴───┴───┴───┴───┴───┴──┬┴───┼───┴┬────┬────┤
+ * │    │    │    │                        │    │    │    │    │
+ * └────┴────┴────┴────────────────────────┴────┴────┴────┴────┘
+ */
+// Row 2
+#define RS_EURO ALGR(RS_IE)   // €