gistfile1.m

//
//  main.m
//  json_formatter
//
//  Created by Jesus Garcia on 3/29/15.
//  Copyright (c) 2015 Jesus Garcia. All rights reserved.
//

#import <Foundation/Foundation.h>



void doWork(int argc, const char * argv[]) {
    
    NSFileManager *fileMgr = [[NSFileManager alloc] init];
    
    
    NSString *srcFilePath  = [[NSString alloc] initWithUTF8String:argv[1]];

    NSString *cwd = [[fileMgr currentDirectoryPath] stringByAppendingString:@"/"];

    srcFilePath = [cwd stringByAppendingString:srcFilePath];
    
    NSString *srcConent = [NSString stringWithContentsOfFile:srcFilePath encoding:NSUTF8StringEncoding error:nil];
    

    NSData *srcJsonData = [srcConent dataUsingEncoding:NSUTF8StringEncoding];
    
    NSDictionary *srcDict = [NSJSONSerialization JSONObjectWithData:srcJsonData
                                      options:NSJSONReadingMutableContainers 
                                        error:nil];


    
    // sort the keys
    NSArray *sortedKeys = [[srcDict allKeys] sortedArrayUsingSelector: @selector(compare:)];
    NSMutableDictionary *sortedValues = [NSMutableDictionary dictionary];

    // Loop through sorted keys adding them to the nsmutable dict.
    for (NSString *key in sortedKeys) {
        [sortedValues setValue:[srcDict objectForKey:key] forKey:key];
    }
    
    
    NSData *outData = [NSJSONSerialization
                        dataWithJSONObject:sortedValues
                        options:NSJSONWritingPrettyPrinted
                        error:nil
                       ];
    
   NSString *outDataAsString = [[NSString alloc] initWithData:outData encoding:NSUTF8StringEncoding];

    
    
    NSString *destFilePath = [[NSString alloc] initWithUTF8String:argv[2]];
    
    destFilePath = [cwd stringByAppendingString:destFilePath];
    
    [outDataAsString writeToFile:destFilePath atomically:true encoding:NSUTF8StringEncoding error:nil];
    

}


int main(int argc, const char * argv[]) {
    @autoreleasepool {
        if (argc < 3) {
            printf("ERROR: Must require source and target files, fool!\n");
            exit(1);
        }
        
        doWork(argc, argv);
        
    }
    return 0;
}