Keyboard layout switcher - Xcode project (objective-c, command line tool)

keyboard_layout_switcher

//
//  main.m
//  keyboard_layout_switcher
//

@import Carbon;

int main(int argc, const char * argv[]) {
    @autoreleasepool {
        if (argc <= 1){
            printf("Missing argument: Pass 'US' or 'German'.\n");
            exit(1);
        }
        NSString *layout = [NSString stringWithUTF8String:argv[1]];
        if ([layout isEqualToString: @"US"] || [layout isEqualToString: @"German"]) {
            NSArray* sources = CFBridgingRelease(TISCreateInputSourceList((__bridge CFDictionaryRef)@{ (__bridge NSString*)kTISPropertyInputSourceID : [NSString stringWithFormat:@"com.apple.keylayout.%@", layout]}, FALSE));
            TISInputSourceRef source = (__bridge TISInputSourceRef)sources[0];
            OSStatus status = TISSelectInputSource(source);
            if (status != noErr){
                printf("Unexpected Error! Could not switch keyboard layout,");
            } else {
                printf("Switched keyboard layout to %s.\n", [layout UTF8String]);
            }
        } else {
            printf("Invalid argument: Pass 'US' or 'German'.\n");
            exit(1);
        }
    }
    return 0;
}