UITextView logging

logger.h

// Adds log entries to a UITextView
typedef typeof(NSString *) LogEntry;
typedef typeof(NSMutableAttributedString *) LogEntryComposition;
typedef const typeof(LogEntryComposition * restrict) LogEntryCompositionPtr;
typedef typeof(void(^)(LogEntry)) LogEngine;
static void (^(^log_engine)(UITextView *))(LogEntry) = ^ (UITextView * text_view) {
    __block LogEntryComposition entry_composition = [[NSMutableAttributedString alloc] init];
    return ^ (LogEntry entry) {
        dispatch_async(dispatch_get_main_queue(), ^{
            NSAttributedString * attributed_entry = [[NSAttributedString alloc] initWithString:entry attributes:^ NSDictionary * (void) {
                NSMutableParagraphStyle *leftAlignedParagraphStyle = [[NSMutableParagraphStyle alloc] init];
                leftAlignedParagraphStyle.alignment = NSTextAlignmentLeft;
                return @{NSForegroundColorAttributeName: [UIColor colorWithRed:0.0 green:0.87 blue:0.19 alpha:1.0],
                         NSFontAttributeName: [UIFont systemFontOfSize:11.0 weight:UIFontWeightMedium],
                         NSParagraphStyleAttributeName: leftAlignedParagraphStyle};
            }()];
            [entry_composition appendAttributedString:attributed_entry];
            [text_view setAttributedText:entry_composition];
        });
    };
};


// Declare a globally scoped variable for use in multiple contexts
static LogEngine textViewLogger;


// Pass a reference to a text view...
textViewLogger = log_engine(self.logTextView);


// Pass an NSString to append a log entry to the existing log
textViewLogger([NSString stringWithFormat:@"%s",  __PRETTY_FUNCTION__]);