Add AltGr/RALT support to Send String

quantum/quantum.c

@@ -850,6 +850,26 @@ const bool ascii_to_shift_lut[0x80] PROGMEM = {
     0, 0, 0, 1, 1, 1, 1, 0
 };
 
+__attribute__ ((weak))
+const bool ascii_to_alt_lut[0x80] PROGMEM = {
+    0, 0, 0, 0, 0, 0, 0, 0,
+    0, 0, 0, 0, 0, 0, 0, 0,
+    0, 0, 0, 0, 0, 0, 0, 0,
+    0, 0, 0, 0, 0, 0, 0, 0,
+    0, 0, 0, 0, 0, 0, 0, 0,
+    0, 0, 0, 0, 0, 0, 0, 0,
+    0, 0, 0, 0, 0, 0, 0, 0,
+    0, 0, 0, 0, 0, 0, 0, 0,
+    0, 0, 0, 0, 0, 0, 0, 0,
+    0, 0, 0, 0, 0, 0, 0, 0,
+    0, 0, 0, 0, 0, 0, 0, 0,
+    0, 0, 0, 0, 0, 0, 0, 0,
+    0, 0, 0, 0, 0, 0, 0, 0,
+    0, 0, 0, 0, 0, 0, 0, 0,
+    0, 0, 0, 0, 0, 0, 0, 0,
+    0, 0, 0, 0, 0, 0, 0, 0
+};
+
 __attribute__ ((weak))
 const uint8_t ascii_to_keycode_lut[0x80] PROGMEM = {
     0, 0, 0, 0, 0, 0, 0, 0,
@@ -932,16 +952,21 @@ void send_string_with_delay_P(const char *str, uint8_t interval) {
 
 void send_char(char ascii_code) {
   uint8_t keycode;
+  bool is_shifted;
+  bool is_alted;
+
   keycode = pgm_read_byte(&ascii_to_keycode_lut[(uint8_t)ascii_code]);
-  if (pgm_read_byte(&ascii_to_shift_lut[(uint8_t)ascii_code])) {
-      register_code(KC_LSFT);
-      register_code(keycode);
-      unregister_code(keycode);
-      unregister_code(KC_LSFT);
-  } else {
-      register_code(keycode);
-      unregister_code(keycode);
-  }
+  if (pgm_read_byte(&ascii_to_shift_lut[(uint8_t)ascii_code])) { is_shifted = true; } else { is_shifted = false; }
+ if (pgm_read_byte(&ascii_to_alt_lut[(uint8_t)ascii_code])) { is_alted = true; } else { is_alted = false; }
+
+  if (is_shifted) { register_code(KC_LSFT); }
+  if (is_alted) { register_code(KC_RALT); }
+
+  register_code(keycode);
+  unregister_code(keycode);
+
+  if (is_alted) { unregister_code(KC_RALT); }
+  if (is_shifted) { unregister_code(KC_LSFT); }
 }
 
 void set_single_persistent_default_layer(uint8_t default_layer) {