changing mac input source (language)

t.m

#import <Foundation/Foundation.h>
#import <Carbon/Carbon.h>
/*###############################################################################
#                                                                                #
#     changeInput                                                                #
#                                                                                #
#     author:   Stefan Klieme (based on an idea by Craig Williams)                #
#     created:  2009-11-05                                                        #
#       Changes input language                                                    #
#     Usage:    changeInput                        prints current input language    #
#                changeInput    name                changes input language to name    #
#                changeInput    toggle name1 name2    toggles input language between    #
#                                                name1 and name2                    #
#                                                                                #
#################################################################################
#                                                                                #
#     This program is free software: you can redistribute it and/or modify        #
#     it under the terms of the GNU General Public License as published by        #
#     the Free Software Foundation, either version 3 of the License, or            #
#     (at your option) any later version.                                        #
#                                                                                #
#     This program is distributed in the hope that it will be useful,            #
#     but WITHOUT ANY WARRANTY; without even the implied warranty of            #
#     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the                #
#     GNU General Public License for more details.                                #
#                                                                                #
#     You should have received a copy of the GNU General Public License            #
#     along with this program.  If not, see <http://www.gnu.org/licenses/>.        #
#                                                                                #
################################################################################*/
 
int main (int argc, const char * argv[]) {
    NSAutoreleasePool * pool = [[NSAutoreleasePool alloc] init];
    
    NSArray *args = [[NSProcessInfo processInfo] arguments];
    TISInputSourceRef current = TISCopyCurrentKeyboardLayoutInputSource();
    NSString *currentName = (NSString *)TISGetInputSourceProperty(current, kTISPropertyLocalizedName);
    if (argc == 1) {
        printf("%s\n", [currentName UTF8String]);
    }
    else {
        NSString *chosenInput, *language1, *language2;
        NSArray  *inputArray = (NSArray *)TISCreateInputSourceList ( NULL, false);
        NSMutableDictionary *availableLanguages = [NSMutableDictionary dictionaryWithCapacity:[inputArray count]];
        NSUInteger i;
        TISInputSourceRef chosen, languageRef1, languageRef2;
        for (i = 0; i < [inputArray count]; ++i) {
            [availableLanguages setObject:[inputArray objectAtIndex:i] forKey:TISGetInputSourceProperty((TISInputSourceRef)[inputArray objectAtIndex:i], kTISPropertyLocalizedName)];
        }
        [inputArray release];
        
        if (argc == 4 && [[args objectAtIndex:1] isEqualTo:@"toggle"]) {
            language1 = [args objectAtIndex:2];
            language2 = [args objectAtIndex:3];
            languageRef1 = (TISInputSourceRef)[availableLanguages objectForKey:language1];
            languageRef2 = (TISInputSourceRef)[availableLanguages objectForKey:language2];
            if (languageRef1 != nil && languageRef2 != nil) {
                chosenInput = ([language1 isEqualTo:currentName]) ? language2 : language1; 
                chosen = (TISInputSourceRef)[availableLanguages objectForKey:chosenInput];
            }
            else {
                chosenInput = (languageRef1 == nil) ? language1 : language2;
                chosen = nil;
            }
        }
        else {
            chosenInput = [args objectAtIndex:1];
            chosen = (TISInputSourceRef)[availableLanguages objectForKey:chosenInput];
        }
        if (chosen) {
            OSStatus err = TISSelectInputSource (chosen);
            if (err)
                printf("Could not change input language (error %i)\n", (int)err);
            else
                printf("Changed input language to %s\n", [chosenInput UTF8String]);
        } 
        else {
            printf("%s not available\n", [chosenInput UTF8String]);
        }
    }
    CFRelease(current);
    [pool release];
    return 0;
}