From b01d34e1dd930c326ef3a0515ca51f0671b3b200 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Konstantin=20=C4=90or=C4=91evi=C4=87?=
 <konstantin.djordjevic@tradecore.com>
Date: Tue, 23 Oct 2018 17:05:22 +0200
Subject: [PATCH] Add cycle_unicode_input_mode and UNICODE_SELECTED_MODES macro

---
 .../process_keycode/process_unicode_common.c  | 29 +++++++++++++++++++
 .../process_keycode/process_unicode_common.h  |  8 +++++
 2 files changed, 37 insertions(+)

diff --git a/quantum/process_keycode/process_unicode_common.c b/quantum/process_keycode/process_unicode_common.c
index 4285d20a19f..a9fbd11b0f4 100644
--- a/quantum/process_keycode/process_unicode_common.c
+++ b/quantum/process_keycode/process_unicode_common.c
@@ -20,6 +20,11 @@
 #include <ctype.h>
 
 static uint8_t input_mode;
+#if UNICODE_SELECTED_MODES != -1
+static uint8_t selected[] = { UNICODE_SELECTED_MODES };
+static uint8_t selected_count = sizeof selected / sizeof *selected;
+static uint8_t selected_index;
+#endif
 uint8_t mods;
 
 void set_unicode_input_mode(uint8_t os_target) {
@@ -35,10 +40,34 @@ void unicode_input_mode_init(void) {
   static bool first_flag = false;
   if (!first_flag) {
     input_mode = eeprom_read_byte(EECONFIG_UNICODEMODE);
+
+#if UNICODE_SELECTED_MODES != -1
+    // Find input_mode in selected modes
+    uint8_t i;
+    for (i = 0; i < selected_count; i++) {
+      if (selected[i] == input_mode) {
+        selected_index = i;
+        break;
+      }
+    }
+    if (i == selected_count) {
+      // input_mode isn't selected, change to one that is
+      input_mode = selected[selected_index = 0];
+    }
+#endif
+
     first_flag = true;
   }
 }
 
+void cycle_unicode_input_mode(void) {
+#if UNICODE_SELECTED_MODES != -1
+  unicode_input_mode_init(); // Init selected_index
+  selected_index = (selected_index + 1) % selected_count;
+  input_mode = selected[selected_index];
+#endif
+}
+
 __attribute__((weak))
 void unicode_input_start (void) {
   // save current mods
diff --git a/quantum/process_keycode/process_unicode_common.h b/quantum/process_keycode/process_unicode_common.h
index e78e1cec6ce..390d6b5e819 100644
--- a/quantum/process_keycode/process_unicode_common.h
+++ b/quantum/process_keycode/process_unicode_common.h
@@ -19,6 +19,12 @@
 
 #include "quantum.h"
 
+// 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
+
 #ifndef UNICODE_TYPE_DELAY
 #define UNICODE_TYPE_DELAY 10
 #endif
@@ -29,6 +35,8 @@ static uint8_t input_mode;
 void set_unicode_input_mode(uint8_t os_target);
 uint8_t get_unicode_input_mode(void);
 void unicode_input_mode_init(void);
+void cycle_unicode_input_mode(void);
+
 void unicode_input_start(void);
 void unicode_input_finish(void);
 void register_hex(uint16_t hex);