GRMustache: use dynamic partials to render a collection of objects

_documentation.md

Documentation of rendering objects: https://github.com/groue/GRMustache/blob/master/Guides/rendering_objects.md

Document.mustache

{{movies}}  {{! one movie is not enough }}

Movie.mustache

{{title}} by {{director}}

Person.mustache

{{firstName}} {{lastName}}

render.m

#import "GRMustache.h"
#import "Movie.h"
#import "Person.h"

// Declare categories on our classes so that they conform to the
// GRMustacheRendering protocol:

@interface Movie(GRMustache)<GRMustacheRendering>
@end

@interface Person(GRMustache)<GRMustacheRendering>
@end


// Now implement the protocol:

@implementation Movie(GRMustache)

- (NSString *)renderForMustacheTag:(GRMustacheTag *)tag context:(GRMustacheContext *)context HTMLSafe:(BOOL *)HTMLSafe error:(NSError **)error
{
    // Extract the "Movie.mustache" partial from the original templateRepository:
    GRMustacheTemplate *partial = [tag.templateRepository templateNamed:@"Movie" error:NULL];

    // Add self to the top of the context stack, so that the partial
    // can access our keys:
    context = [context contextByAddingObject:self];

    // Return the rendering of the partial
    return [partial renderContentWithContext:context HTMLSafe:HTMLSafe error:error];
}

@end

@implementation Person(GRMustache)

- (NSString *)renderForMustacheTag:(GRMustacheTag *)tag context:(GRMustacheContext *)context HTMLSafe:(BOOL *)HTMLSafe error:(NSError **)error
{
    // Extract the "Person.mustache" partial from the original templateRepository:
    GRMustacheTemplate *partial = [tag.templateRepository templateNamed:@"Person" error:NULL];

    // Add self to the top of the context stack, so that the partial
    // can access our keys:
    context = [context contextByAddingObject:self];

    // Return the rendering of the partial
    return [partial renderContentWithContext:context HTMLSafe:HTMLSafe error:error];
}

@end


// Render

main() {
    @autoreleasepool {
        id data = @{
            @"movies": @[
                [Movie movieWithTitle:@"Citizen Kane"
                             director:[Person personWithFirstName:@"Orson" lastName:@"Welles"]],
                [Movie movieWithTitle:@"Some Like It Hot"
                             director:[Person personWithFirstName:@"Billy" lastName:@"Wilder"]],
            ]
        };

        NSString *rendering = [GRMustacheTemplate renderObject:data
                                                  fromResource:@"Document"
                                                        bundle:nil
                                                         error:NULL];
    }
}

rendering.txt

Citizen Kane by Orson Welles
Some Like It Hot by Billy Wilder