renameFileByTag.m

#import <Foundation/Foundation.h>

int main (int argc, const char * argv[]) {
    NSAutoreleasePool * pool = [[NSAutoreleasePool alloc] init];
	
	// arguments array
	NSArray *args = [[NSProcessInfo processInfo] arguments];
	// check if all arguments have been supplied
	if ( argc != 3 && argc != 4 )
		printf("Usage:\nSource directory [path]\ntag [string]\nencoding [MacRoman / ISO8859-1 / UTF8 / UTF16]\n");
	else 
	{
		NSFileManager *NSFm;
		NSStringEncoding textEncoding;
		NSFm = [NSFileManager defaultManager];
		NSString *sourceDirectory = [args objectAtIndex:1];

		if ([NSFm fileExistsAtPath:sourceDirectory] == NO) {
			printf("source directory doesn't exist.\n");
			return 1; }
		
		NSString *tag = [args objectAtIndex:2];
		NSString *inTag = [NSString stringWithFormat:@"<%@>", tag];
		NSString *outTag = [NSString stringWithFormat:@"</%@>", tag];
	 
		if  (argc == 4) {
			NSString *enc = [args objectAtIndex:3];
			if ([enc isEqualToString:@"MacRoman"])
				textEncoding =  NSMacOSRomanStringEncoding;
			else if ([enc isEqualToString:@"ISO8859-1"])
				textEncoding = NSISOLatin1StringEncoding;
			else if ([enc isEqualToString:@"UTF8"])
				textEncoding = NSUTF8StringEncoding;
			else if ([enc isEqualToString:@"UTF16"])
				textEncoding = NSUnicodeStringEncoding;
			else
				{
				printf("Invalid text encoding.\n");
				return 2; 
				}
			}
		else
			textEncoding =  NSMacOSRomanStringEncoding;
		
		NSString *fileName, *sourcePath, *value, *destinationPath;
		
		NSScanner *fileScanner;
		NSArray *fileArray;

		int i, n;
	
		fileArray = [NSFm directoryContentsAtPath:sourceDirectory];
		n = [fileArray count];	
		for (i=0; i < n; ++i)
		{
			fileName = [fileArray objectAtIndex:i];
			if ([fileName hasPrefix:@"."] == NO) {
				
				sourcePath = [sourceDirectory stringByAppendingPathComponent:fileName];
				NSString *sourceText = [[NSString alloc]
									initWithContentsOfFile:sourcePath
									encoding:textEncoding
									error:NULL];
			
				if (sourceText != nil)
				{
					fileScanner = [NSScanner scannerWithString:sourceText];
					if ([fileScanner scanUpToString:inTag intoString:NULL] == YES) 
					{
						[fileScanner scanString:inTag intoString:NULL];
						[fileScanner scanUpToString:outTag intoString:&value];
						destinationPath  = [sourceDirectory stringByAppendingPathComponent:value];
						destinationPath  = [destinationPath stringByAppendingString:@".txt"];
						[NSFm movePath:sourcePath toPath:destinationPath handler:nil];
					}
					[sourceText release];
				
				}
			}
		}	
	}
		
    [pool release];
    return 0;
}