Categories/NSFileManager+UniqueNames.m

   1 //
   2 //  NSFileManager+UniqueNames.m
   3 //  Enjoyable
   4 //
   5 //  Created by Joe Wreschnig on 3/7/13.
   6 //
   7 //
   8
   9 #import "NSFileManager+UniqueNames.h"
  10
  11 @implementation NSFileManager (UniqueNames)
  12
  13 - (NSURL *)generateUniqueURLWithBase:(NSURL *)canonical {
  14     // Punt for cases that are just too hard.
  15     if (!canonical.isFileURL)
  16         return canonical;
  17
  18     NSString *trying = canonical.path;
  19     NSString *dirname = [trying stringByDeletingLastPathComponent];
  20     NSString *basename = [trying.lastPathComponent stringByDeletingPathExtension];
  21     NSString *extension = trying.pathExtension;
  22     int index = 1;
  23     while ([self fileExistsAtPath:trying] && index < 10000) {
  24         NSString *indexName = [NSString stringWithFormat:@"%@ (%d)", basename, index++];
  25         indexName = [indexName stringByAppendingPathExtension:extension];
  26         trying = [dirname stringByAppendingPathComponent:indexName];
  27     }
  28     return [NSURL fileURLWithPath:trying];
  29 }
  30
  31 @end