Awesome debug

Debug.h

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

#ifdef DEBUG
#define DebugLog( xx, ...) _DebugLog(@"%s(%d): " xx, __PRETTY_FUNCTION__, __LINE__, ##__VA_ARGS__)
#else
#define DebugLog( s, ... ) ((void)0)
#endif


void _DebugLog(NSString *format, ...);
void DEBUGChangeOutputToFile(NSString *filename);

Debug.m

//Debug.m


#import "Debug.h"

void _DebugLog(NSString *format,...) {
    va_list ap;
    va_start (ap, format);
    if (![format hasSuffix: @"\n"]) {
		format = [format stringByAppendingString: @"\n"];
    }
    NSString *body =  [[NSString alloc] initWithFormat: format arguments: ap];
    va_end (ap);
	
	NSDateFormatter *formatter = [[NSDateFormatter alloc] init];
	[formatter setDateFormat:@"yyyy-MM-dd@HH:mm:ss"];
	NSString *dateString = [formatter stringFromDate:[NSDate date]];
	fprintf(stderr,"[%s]%s",[dateString UTF8String] ,[body UTF8String]);
	fflush(stderr);
    [body release];
	[formatter release];
}

void DEBUGChangeOutputToFile(NSString *filename) {
//change stderr output to file
	NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
	NSString *documentsDirectory = [paths objectAtIndex:0];
	NSString *logPath = [documentsDirectory stringByAppendingPathComponent:filename];
	freopen([logPath cStringUsingEncoding:NSASCIIStringEncoding],"a+",stderr);
}