im-select:change mac input method via command line. copied from https://github.com/CodeFalling/smart-im-osx

im-select.m

//
//  im-select
//
//  Created by Ying Bian on 8/21/12.
//  Copyright (c) 2012 Ying Bian. All rights reserved.
//

#import <Foundation/Foundation.h>
#import <Carbon/Carbon.h>

int main(int argc, const char * argv[]) {
    NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init];

    int returnCode = 0;

    if (argc > 1) {
        NSString *imId = [NSString stringWithUTF8String:argv[1]];
        NSDictionary *filter = [NSDictionary dictionaryWithObject:imId forKey:(NSString *)kTISPropertyInputSourceID];
        CFArrayRef keyboards = TISCreateInputSourceList((CFDictionaryRef)filter, false);
        if (keyboards) {
            TISInputSourceRef selected = (TISInputSourceRef)CFArrayGetValueAtIndex(keyboards, 0);
            returnCode = TISSelectInputSource(selected);
            CFRelease(keyboards);
        } else {
            returnCode = 1;
        }
    } else {
        TISInputSourceRef current = TISCopyCurrentKeyboardInputSource();
        NSString *sourceId = (NSString *)(TISGetInputSourceProperty(current, kTISPropertyInputSourceID));
        fprintf(stdout, "%s\n", [sourceId UTF8String]);
        CFRelease(current);
    }

    [pool release];

    return returnCode;
}

Makefile

CC=/usr/bin/clang
NAME=im-select
INSTALL_PATH=/usr/local/bin/
OPTS=-framework foundation -framework carbon

all:
	$(CC) $(OPTS) -o $(NAME) $(NAME).m

install:$(NAME)
	cp $(NAME) $(INSTALL_PATH)

uninstall:
	rm $(INSTALL_PATH)$(NAME)