gistfile1.m

#import "GRMustache.h"

NSString *templateString = @"{{# repeat(Red) }}<img src=\"img/red.png\">{{/ repeat(Red) }}}";
GRMustacheTemplate *template = [GRMustacheTemplate templateFromString:templateString error:NULL];

id obj = @{
           @"Red": @10,
           @"repeat": [GRMustacheFilter filterWithBlock:^id(NSNumber *number) {
               NSInteger count = [number integerValue];
               return [GRMustache renderingObjectWithBlock:^NSString *(GRMustacheTag *tag, GRMustacheContext *context, BOOL *HTMLSafe, NSError *__autoreleasing *error) {
                   NSString *single = [tag renderContentWithContext:context HTMLSafe:HTMLSafe error:error];
                   NSMutableString *buffer = [NSMutableString string];
                   for (NSInteger i=0; i<count; ++i) {
                       [buffer appendString:single];
                   }
                   return buffer;
               }];
           }]
};

// 10 times <img src="img/red.png">
NSString *rendering = [template renderObject:obj error:NULL];