Add a workaround for non-GUI programs that do not use run-loops.

input_source_controller.cpp

@@ -118,6 +118,9 @@ extern "C" {
     static char buffer[1024];
 
     const char* Xkb_Switch_getXkbLayout(const char* /* unused */) {
+        // Hack to update current input source for programs that do not use standard runloop (MacVim in console mode for ex)
+        CFRunLoopRunInMode(kCFRunLoopDefaultMode, 0, false);
+
         buffer[0] = '\0';
         try {
             InputSourceController ctrl;

test.c

@@ -1,10 +1,14 @@
 #include <stdio.h>
 #include <stdlib.h>
+#include <unistd.h>
 
 const char* Xkb_Switch_getXkbLayout(const char*);
 
 int
 main() {
-    printf("Result: %s\n", Xkb_Switch_getXkbLayout(""));
+    while (1) {
+        printf("Result: %s\n", Xkb_Switch_getXkbLayout(""));
+        sleep(1);
+    }
     return 0;
 }