GRMustache: variadic filters

_documentation.md

Documentation of filters: https://github.com/groue/GRMustache/blob/master/Guides/filters.md

base.mustache

{{#object1}}
    {{ dateFormat(date, format) }}
{{/object1}}
{{#object2}}
    {{ dateFormat(date) }}
{{/object2}}

render.m

id filters = @{
    @"dateFormat": [GRMustacheFilter variadicFilterWithBlock:^id(NSArray *arguments) {
        // first argument is date
        NSDate *date = [arguments objectAtIndex:0];

        // second (optional) argument is format
        NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
        if (arguments.count > 1)
            dateFormatter.format = [arguments objectAtIndex:1];
        else
            dateFormatter.format = @"yyyy-MM-dd";

        // compute the result
        return [dateFormatter stringFromDate:date];
    }]
};

id data = @{
    @"object1": @{
        @"format": @"yyyy-MM-dd 'at' HH:mm",
        @"date": [NSDate date]
    },
    @"object2": @{
        @"date": [NSDate date]
    }
};

NSString *rendering = [GRMustacheTemplate renderObject:data
                                           withFilters:filters
                                          fromResource:@"base"
                                                bundle:nil
                                                 error:NULL];

rendering.txt

2012-10-20 at 15:05
2012-10-20