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Example/Pods/CocoaLumberjack/Classes/Extensions/DDContextFilterLogFormatter.h

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+// Software License Agreement (BSD License)
+//
+// Copyright (c) 2010-2015, Deusty, LLC
+// All rights reserved.
+//
+// Redistribution and use of this software in source and binary forms,
+// with or without modification, are permitted provided that the following conditions are met:
+//
+// * Redistributions of source code must retain the above copyright notice,
+//   this list of conditions and the following disclaimer.
+//
+// * Neither the name of Deusty nor the names of its contributors may be used
+//   to endorse or promote products derived from this software without specific
+//   prior written permission of Deusty, LLC.
+
+#import <Foundation/Foundation.h>
+
+// Disable legacy macros
+#ifndef DD_LEGACY_MACROS
+    #define DD_LEGACY_MACROS 0
+#endif
+
+#import "DDLog.h"
+
+/**
+ * This class provides a log formatter that filters log statements from a logging context not on the whitelist.
+ *
+ * A log formatter can be added to any logger to format and/or filter its output.
+ * You can learn more about log formatters here:
+ * Documentation/CustomFormatters.md
+ *
+ * You can learn more about logging context's here:
+ * Documentation/CustomContext.md
+ *
+ * But here's a quick overview / refresher:
+ *
+ * Every log statement has a logging context.
+ * These come from the underlying logging macros defined in DDLog.h.
+ * The default logging context is zero.
+ * You can define multiple logging context's for use in your application.
+ * For example, logically separate parts of your app each have a different logging context.
+ * Also 3rd party frameworks that make use of Lumberjack generally use their own dedicated logging context.
+ **/
+@interface DDContextWhitelistFilterLogFormatter : NSObject <DDLogFormatter>
+
+/**
+ *  Designated default initializer
+ */
+- (instancetype)init NS_DESIGNATED_INITIALIZER;
+
+/**
+ *  Add a context to the whitelist
+ *
+ *  @param loggingContext the context
+ */
+- (void)addToWhitelist:(NSUInteger)loggingContext;
+
+/**
+ *  Remove context from whitelist
+ *
+ *  @param loggingContext the context
+ */
+- (void)removeFromWhitelist:(NSUInteger)loggingContext;
+
+/**
+ *  Return the whitelist
+ */
+@property (readonly, copy) NSArray *whitelist;
+
+/**
+ *  Check if a context is on the whitelist
+ *
+ *  @param loggingContext the context
+ */
+- (BOOL)isOnWhitelist:(NSUInteger)loggingContext;
+
+@end
+
+////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
+#pragma mark -
+////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
+
+/**
+ * This class provides a log formatter that filters log statements from a logging context on the blacklist.
+ **/
+@interface DDContextBlacklistFilterLogFormatter : NSObject <DDLogFormatter>
+
+- (instancetype)init NS_DESIGNATED_INITIALIZER;
+
+/**
+ *  Add a context to the blacklist
+ *
+ *  @param loggingContext the context
+ */
+- (void)addToBlacklist:(NSUInteger)loggingContext;
+
+/**
+ *  Remove context from blacklist
+ *
+ *  @param loggingContext the context
+ */
+- (void)removeFromBlacklist:(NSUInteger)loggingContext;
+
+/**
+ *  Return the blacklist
+ */
+@property (readonly, copy) NSArray *blacklist;
+
+
+/**
+ *  Check if a context is on the blacklist
+ *
+ *  @param loggingContext the context
+ */
+- (BOOL)isOnBlacklist:(NSUInteger)loggingContext;
+
+@end

Example/Pods/CocoaLumberjack/Classes/Extensions/DDContextFilterLogFormatter.m

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+// Software License Agreement (BSD License)
+//
+// Copyright (c) 2010-2015, Deusty, LLC
+// All rights reserved.
+//
+// Redistribution and use of this software in source and binary forms,
+// with or without modification, are permitted provided that the following conditions are met:
+//
+// * Redistributions of source code must retain the above copyright notice,
+//   this list of conditions and the following disclaimer.
+//
+// * Neither the name of Deusty nor the names of its contributors may be used
+//   to endorse or promote products derived from this software without specific
+//   prior written permission of Deusty, LLC.
+
+#import "DDContextFilterLogFormatter.h"
+#import <libkern/OSAtomic.h>
+
+#if !__has_feature(objc_arc)
+#error This file must be compiled with ARC. Use -fobjc-arc flag (or convert project to ARC).
+#endif
+
+@interface DDLoggingContextSet : NSObject
+
+- (void)addToSet:(NSUInteger)loggingContext;
+- (void)removeFromSet:(NSUInteger)loggingContext;
+
+@property (readonly, copy) NSArray *currentSet;
+
+- (BOOL)isInSet:(NSUInteger)loggingContext;
+
+@end
+
+////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
+#pragma mark -
+////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
+
+@interface DDContextWhitelistFilterLogFormatter () {
+    DDLoggingContextSet *_contextSet;
+}
+
+@end
+
+
+@implementation DDContextWhitelistFilterLogFormatter
+
+- (instancetype)init {
+    if ((self = [super init])) {
+        _contextSet = [[DDLoggingContextSet alloc] init];
+    }
+
+    return self;
+}
+
+- (void)addToWhitelist:(NSUInteger)loggingContext {
+    [_contextSet addToSet:loggingContext];
+}
+
+- (void)removeFromWhitelist:(NSUInteger)loggingContext {
+    [_contextSet removeFromSet:loggingContext];
+}
+
+- (NSArray *)whitelist {
+    return [_contextSet currentSet];
+}
+
+- (BOOL)isOnWhitelist:(NSUInteger)loggingContext {
+    return [_contextSet isInSet:loggingContext];
+}
+
+- (NSString *)formatLogMessage:(DDLogMessage *)logMessage {
+    if ([self isOnWhitelist:logMessage->_context]) {
+        return logMessage->_message;
+    } else {
+        return nil;
+    }
+}
+
+@end
+
+////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
+#pragma mark -
+////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
+
+@interface DDContextBlacklistFilterLogFormatter () {
+    DDLoggingContextSet *_contextSet;
+}
+
+@end
+
+
+@implementation DDContextBlacklistFilterLogFormatter
+
+- (instancetype)init {
+    if ((self = [super init])) {
+        _contextSet = [[DDLoggingContextSet alloc] init];
+    }
+
+    return self;
+}
+
+- (void)addToBlacklist:(NSUInteger)loggingContext {
+    [_contextSet addToSet:loggingContext];
+}
+
+- (void)removeFromBlacklist:(NSUInteger)loggingContext {
+    [_contextSet removeFromSet:loggingContext];
+}
+
+- (NSArray *)blacklist {
+    return [_contextSet currentSet];
+}
+
+- (BOOL)isOnBlacklist:(NSUInteger)loggingContext {
+    return [_contextSet isInSet:loggingContext];
+}
+
+- (NSString *)formatLogMessage:(DDLogMessage *)logMessage {
+    if ([self isOnBlacklist:logMessage->_context]) {
+        return nil;
+    } else {
+        return logMessage->_message;
+    }
+}
+
+@end
+
+////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
+#pragma mark -
+////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
+
+
+@interface DDLoggingContextSet () {
+    OSSpinLock _lock;
+    NSMutableSet *_set;
+}
+
+@end
+
+
+@implementation DDLoggingContextSet
+
+- (instancetype)init {
+    if ((self = [super init])) {
+        _set = [[NSMutableSet alloc] init];
+    }
+
+    return self;
+}
+
+- (void)addToSet:(NSUInteger)loggingContext {
+    OSSpinLockLock(&_lock);
+    {
+        [_set addObject:@(loggingContext)];
+    }
+    OSSpinLockUnlock(&_lock);
+}
+
+- (void)removeFromSet:(NSUInteger)loggingContext {
+    OSSpinLockLock(&_lock);
+    {
+        [_set removeObject:@(loggingContext)];
+    }
+    OSSpinLockUnlock(&_lock);
+}
+
+- (NSArray *)currentSet {
+    NSArray *result = nil;
+
+    OSSpinLockLock(&_lock);
+    {
+        result = [_set allObjects];
+    }
+    OSSpinLockUnlock(&_lock);
+
+    return result;
+}
+
+- (BOOL)isInSet:(NSUInteger)loggingContext {
+    BOOL result = NO;
+
+    OSSpinLockLock(&_lock);
+    {
+        result = [_set containsObject:@(loggingContext)];
+    }
+    OSSpinLockUnlock(&_lock);
+
+    return result;
+}
+
+@end

Example/Pods/CocoaLumberjack/Classes/Extensions/DDDispatchQueueLogFormatter.h

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+// Software License Agreement (BSD License)
+//
+// Copyright (c) 2010-2015, Deusty, LLC
+// All rights reserved.
+//
+// Redistribution and use of this software in source and binary forms,
+// with or without modification, are permitted provided that the following conditions are met:
+//
+// * Redistributions of source code must retain the above copyright notice,
+//   this list of conditions and the following disclaimer.
+//
+// * Neither the name of Deusty nor the names of its contributors may be used
+//   to endorse or promote products derived from this software without specific
+//   prior written permission of Deusty, LLC.
+
+#import <Foundation/Foundation.h>
+#import <libkern/OSAtomic.h>
+
+// Disable legacy macros
+#ifndef DD_LEGACY_MACROS
+    #define DD_LEGACY_MACROS 0
+#endif
+
+#import "DDLog.h"
+
+/**
+ *  Log formatter mode
+ */
+typedef NS_ENUM(NSUInteger, DDDispatchQueueLogFormatterMode){
+    /**
+     *  This is the default option, means the formatter can be reused between multiple loggers and therefore is thread-safe.
+     *  There is, of course, a performance cost for the thread-safety
+     */
+    DDDispatchQueueLogFormatterModeShareble = 0,
+    /**
+     *  If the formatter will only be used by a single logger, then the thread-safety can be removed
+     *  @note: there is an assert checking if the formatter is added to multiple loggers and the mode is non-shareble
+     */
+    DDDispatchQueueLogFormatterModeNonShareble,
+};
+
+
+/**
+ * This class provides a log formatter that prints the dispatch_queue label instead of the mach_thread_id.
+ *
+ * A log formatter can be added to any logger to format and/or filter its output.
+ * You can learn more about log formatters here:
+ * Documentation/CustomFormatters.md
+ *
+ * A typical `NSLog` (or `DDTTYLogger`) prints detailed info as `[<process_id>:<thread_id>]`.
+ * For example:
+ *
+ * `2011-10-17 20:21:45.435 AppName[19928:5207] Your log message here`
+ *
+ * Where:
+ * `- 19928 = process id`
+ * `-  5207 = thread id (mach_thread_id printed in hex)`
+ *
+ * When using grand central dispatch (GCD), this information is less useful.
+ * This is because a single serial dispatch queue may be run on any thread from an internally managed thread pool.
+ * For example:
+ *
+ * `2011-10-17 20:32:31.111 AppName[19954:4d07] Message from my_serial_dispatch_queue`
+ * `2011-10-17 20:32:31.112 AppName[19954:5207] Message from my_serial_dispatch_queue`
+ * `2011-10-17 20:32:31.113 AppName[19954:2c55] Message from my_serial_dispatch_queue`
+ *
+ * This formatter allows you to replace the standard `[box:info]` with the dispatch_queue name.
+ * For example:
+ *
+ * `2011-10-17 20:32:31.111 AppName[img-scaling] Message from my_serial_dispatch_queue`
+ * `2011-10-17 20:32:31.112 AppName[img-scaling] Message from my_serial_dispatch_queue`
+ * `2011-10-17 20:32:31.113 AppName[img-scaling] Message from my_serial_dispatch_queue`
+ *
+ * If the dispatch_queue doesn't have a set name, then it falls back to the thread name.
+ * If the current thread doesn't have a set name, then it falls back to the mach_thread_id in hex (like normal).
+ *
+ * Note: If manually creating your own background threads (via `NSThread/alloc/init` or `NSThread/detachNeThread`),
+ * you can use `[[NSThread currentThread] setName:(NSString *)]`.
+ **/
+@interface DDDispatchQueueLogFormatter : NSObject <DDLogFormatter>
+
+/**
+ * Standard init method.
+ * Configure using properties as desired.
+ **/
+- (instancetype)init NS_DESIGNATED_INITIALIZER;
+
+/**
+ *  Initializer with ability to set the queue mode
+ *
+ *  @param mode choose between DDDispatchQueueLogFormatterModeShareble and DDDispatchQueueLogFormatterModeNonShareble, depending if the formatter is shared between several loggers or not
+ */
+- (instancetype)initWithMode:(DDDispatchQueueLogFormatterMode)mode;
+
+/**
+ * The minQueueLength restricts the minimum size of the [detail box].
+ * If the minQueueLength is set to 0, there is no restriction.
+ *
+ * For example, say a dispatch_queue has a label of "diskIO":
+ *
+ * If the minQueueLength is 0: [diskIO]
+ * If the minQueueLength is 4: [diskIO]
+ * If the minQueueLength is 5: [diskIO]
+ * If the minQueueLength is 6: [diskIO]
+ * If the minQueueLength is 7: [diskIO ]
+ * If the minQueueLength is 8: [diskIO  ]
+ *
+ * The default minQueueLength is 0 (no minimum, so [detail box] won't be padded).
+ *
+ * If you want every [detail box] to have the exact same width,
+ * set both minQueueLength and maxQueueLength to the same value.
+ **/
+@property (assign, atomic) NSUInteger minQueueLength;
+
+/**
+ * The maxQueueLength restricts the number of characters that will be inside the [detail box].
+ * If the maxQueueLength is 0, there is no restriction.
+ *
+ * For example, say a dispatch_queue has a label of "diskIO":
+ *
+ * If the maxQueueLength is 0: [diskIO]
+ * If the maxQueueLength is 4: [disk]
+ * If the maxQueueLength is 5: [diskI]
+ * If the maxQueueLength is 6: [diskIO]
+ * If the maxQueueLength is 7: [diskIO]
+ * If the maxQueueLength is 8: [diskIO]
+ *
+ * The default maxQueueLength is 0 (no maximum, so [detail box] won't be truncated).
+ *
+ * If you want every [detail box] to have the exact same width,
+ * set both minQueueLength and maxQueueLength to the same value.
+ **/
+@property (assign, atomic) NSUInteger maxQueueLength;
+
+/**
+ * Sometimes queue labels have long names like "com.apple.main-queue",
+ * but you'd prefer something shorter like simply "main".
+ *
+ * This method allows you to set such preferred replacements.
+ * The above example is set by default.
+ *
+ * To remove/undo a previous replacement, invoke this method with nil for the 'shortLabel' parameter.
+ **/
+- (NSString *)replacementStringForQueueLabel:(NSString *)longLabel;
+
+/**
+ *  See the `replacementStringForQueueLabel:` description
+ */
+- (void)setReplacementString:(NSString *)shortLabel forQueueLabel:(NSString *)longLabel;
+
+@end
+
+/**
+ *  Category on `DDDispatchQueueLogFormatter` to make method declarations easier to extend/modify
+ **/
+@interface DDDispatchQueueLogFormatter (OverridableMethods)
+
+/**
+ *  Date formatter default configuration
+ */
+- (void)configureDateFormatter:(NSDateFormatter *)dateFormatter;
+
+/**
+ *  Formatter method to transfrom from date to string
+ */
+- (NSString *)stringFromDate:(NSDate *)date;
+
+/**
+ *  Method to compute the queue thread label
+ */
+- (NSString *)queueThreadLabelForLogMessage:(DDLogMessage *)logMessage;
+
+/**
+ *  The actual method that formats a message (transforms a `DDLogMessage` model into a printable string)
+ */
+- (NSString *)formatLogMessage:(DDLogMessage *)logMessage;
+
+@end

Example/Pods/CocoaLumberjack/Classes/Extensions/DDDispatchQueueLogFormatter.m

@@ -0,0 +1,277 @@
+// Software License Agreement (BSD License)
+//
+// Copyright (c) 2010-2015, Deusty, LLC
+// All rights reserved.
+//
+// Redistribution and use of this software in source and binary forms,
+// with or without modification, are permitted provided that the following conditions are met:
+//
+// * Redistributions of source code must retain the above copyright notice,
+//   this list of conditions and the following disclaimer.
+//
+// * Neither the name of Deusty nor the names of its contributors may be used
+//   to endorse or promote products derived from this software without specific
+//   prior written permission of Deusty, LLC.
+
+#import "DDDispatchQueueLogFormatter.h"
+#import <libkern/OSAtomic.h>
+#import <objc/runtime.h>
+
+
+#if !__has_feature(objc_arc)
+#error This file must be compiled with ARC. Use -fobjc-arc flag (or convert project to ARC).
+#endif
+
+@interface DDDispatchQueueLogFormatter () {
+    DDDispatchQueueLogFormatterMode _mode;
+    NSString *_dateFormatterKey;
+    
+    int32_t _atomicLoggerCount;
+    NSDateFormatter *_threadUnsafeDateFormatter; // Use [self stringFromDate]
+    
+    OSSpinLock _lock;
+    
+    NSUInteger _minQueueLength;           // _prefix == Only access via atomic property
+    NSUInteger _maxQueueLength;           // _prefix == Only access via atomic property
+    NSMutableDictionary *_replacements;   // _prefix == Only access from within spinlock
+}
+
+@end
+
+
+@implementation DDDispatchQueueLogFormatter
+
+- (instancetype)init {
+    if ((self = [super init])) {
+        _mode = DDDispatchQueueLogFormatterModeShareble;
+
+        // We need to carefully pick the name for storing in thread dictionary to not
+        // use a formatter configured by subclass and avoid surprises.
+        Class cls = [self class];
+        Class superClass = class_getSuperclass(cls);
+        SEL configMethodName = @selector(configureDateFormatter:);
+        Method configMethod = class_getInstanceMethod(cls, configMethodName);
+        while (class_getInstanceMethod(superClass, configMethodName) == configMethod) {
+            cls = superClass;
+            superClass = class_getSuperclass(cls);
+        }
+        // now `cls` is the class that provides implementation for `configureDateFormatter:`
+        _dateFormatterKey = [NSString stringWithFormat:@"%s_NSDateFormatter", class_getName(cls)];
+
+        _atomicLoggerCount = 0;
+        _threadUnsafeDateFormatter = nil;
+
+        _minQueueLength = 0;
+        _maxQueueLength = 0;
+        _replacements = [[NSMutableDictionary alloc] init];
+
+        // Set default replacements:
+
+        _replacements[@"com.apple.main-thread"] = @"main";
+    }
+
+    return self;
+}
+
+- (instancetype)initWithMode:(DDDispatchQueueLogFormatterMode)mode {
+    if ((self = [self init])) {
+        _mode = mode;
+    }
+    return self;
+}
+
+////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
+#pragma mark Configuration
+////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
+
+@synthesize minQueueLength = _minQueueLength;
+@synthesize maxQueueLength = _maxQueueLength;
+
+- (NSString *)replacementStringForQueueLabel:(NSString *)longLabel {
+    NSString *result = nil;
+
+    OSSpinLockLock(&_lock);
+    {
+        result = _replacements[longLabel];
+    }
+    OSSpinLockUnlock(&_lock);
+
+    return result;
+}
+
+- (void)setReplacementString:(NSString *)shortLabel forQueueLabel:(NSString *)longLabel {
+    OSSpinLockLock(&_lock);
+    {
+        if (shortLabel) {
+            _replacements[longLabel] = shortLabel;
+        } else {
+            [_replacements removeObjectForKey:longLabel];
+        }
+    }
+    OSSpinLockUnlock(&_lock);
+}
+
+////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
+#pragma mark DDLogFormatter
+////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
+
+- (NSDateFormatter *)createDateFormatter {
+    NSDateFormatter *formatter = [[NSDateFormatter alloc] init];
+    [self configureDateFormatter:formatter];
+    return formatter;
+}
+
+- (void)configureDateFormatter:(NSDateFormatter *)dateFormatter {
+    [dateFormatter setFormatterBehavior:NSDateFormatterBehavior10_4];
+    [dateFormatter setDateFormat:@"yyyy-MM-dd HH:mm:ss:SSS"];
+    [dateFormatter setLocale:[NSLocale localeWithLocaleIdentifier:@"en_US_POSIX"]];
+
+    NSString *calendarIdentifier = nil;
+#if defined(__IPHONE_8_0) || defined(__MAC_10_10)
+    calendarIdentifier = NSCalendarIdentifierGregorian;
+#else
+    calendarIdentifier = NSGregorianCalendar;
+#endif
+
+    [dateFormatter setCalendar:[[NSCalendar alloc] initWithCalendarIdentifier:calendarIdentifier]];
+}
+
+- (NSString *)stringFromDate:(NSDate *)date {
+
+    NSDateFormatter *dateFormatter = nil;
+    if (_mode == DDDispatchQueueLogFormatterModeNonShareble) {
+        // Single-threaded mode.
+
+        dateFormatter = _threadUnsafeDateFormatter;
+        if (dateFormatter == nil) {
+            dateFormatter = [self createDateFormatter];
+            _threadUnsafeDateFormatter = dateFormatter;
+        }
+    } else {
+        // Multi-threaded mode.
+        // NSDateFormatter is NOT thread-safe.
+
+        NSString *key = _dateFormatterKey;
+
+        NSMutableDictionary *threadDictionary = [[NSThread currentThread] threadDictionary];
+        dateFormatter = threadDictionary[key];
+
+        if (dateFormatter == nil) {
+            dateFormatter = [self createDateFormatter];
+            threadDictionary[key] = dateFormatter;
+        }
+    }
+
+    return [dateFormatter stringFromDate:date];
+}
+
+- (NSString *)queueThreadLabelForLogMessage:(DDLogMessage *)logMessage {
+    // As per the DDLogFormatter contract, this method is always invoked on the same thread/dispatch_queue
+
+    NSUInteger minQueueLength = self.minQueueLength;
+    NSUInteger maxQueueLength = self.maxQueueLength;
+
+    // Get the name of the queue, thread, or machID (whichever we are to use).
+
+    NSString *queueThreadLabel = nil;
+
+    BOOL useQueueLabel = YES;
+    BOOL useThreadName = NO;
+
+    if (logMessage->_queueLabel) {
+        // If you manually create a thread, it's dispatch_queue will have one of the thread names below.
+        // Since all such threads have the same name, we'd prefer to use the threadName or the machThreadID.
+
+        NSArray *names = @[
+            @"com.apple.root.low-priority",
+            @"com.apple.root.default-priority",
+            @"com.apple.root.high-priority",
+            @"com.apple.root.low-overcommit-priority",
+            @"com.apple.root.default-overcommit-priority",
+            @"com.apple.root.high-overcommit-priority"
+        ];
+
+        for (NSString * name in names) {
+            if ([logMessage->_queueLabel isEqualToString:name]) {
+                useQueueLabel = NO;
+                useThreadName = [logMessage->_threadName length] > 0;
+                break;
+            }
+        }
+    } else {
+        useQueueLabel = NO;
+        useThreadName = [logMessage->_threadName length] > 0;
+    }
+
+    if (useQueueLabel || useThreadName) {
+        NSString *fullLabel;
+        NSString *abrvLabel;
+
+        if (useQueueLabel) {
+            fullLabel = logMessage->_queueLabel;
+        } else {
+            fullLabel = logMessage->_threadName;
+        }
+
+        OSSpinLockLock(&_lock);
+        {
+            abrvLabel = _replacements[fullLabel];
+        }
+        OSSpinLockUnlock(&_lock);
+
+        if (abrvLabel) {
+            queueThreadLabel = abrvLabel;
+        } else {
+            queueThreadLabel = fullLabel;
+        }
+    } else {
+        queueThreadLabel = logMessage->_threadID;
+    }
+
+    // Now use the thread label in the output
+
+    NSUInteger labelLength = [queueThreadLabel length];
+
+    // labelLength > maxQueueLength : truncate
+    // labelLength < minQueueLength : padding
+    //                              : exact
+
+    if ((maxQueueLength > 0) && (labelLength > maxQueueLength)) {
+        // Truncate
+
+        return [queueThreadLabel substringToIndex:maxQueueLength];
+    } else if (labelLength < minQueueLength) {
+        // Padding
+
+        NSUInteger numSpaces = minQueueLength - labelLength;
+
+        char spaces[numSpaces + 1];
+        memset(spaces, ' ', numSpaces);
+        spaces[numSpaces] = '\0';
+
+        return [NSString stringWithFormat:@"%@%s", queueThreadLabel, spaces];
+    } else {
+        // Exact
+
+        return queueThreadLabel;
+    }
+}
+
+- (NSString *)formatLogMessage:(DDLogMessage *)logMessage {
+    NSString *timestamp = [self stringFromDate:(logMessage->_timestamp)];
+    NSString *queueThreadLabel = [self queueThreadLabelForLogMessage:logMessage];
+
+    return [NSString stringWithFormat:@"%@ [%@] %@", timestamp, queueThreadLabel, logMessage->_message];
+}
+
+- (void)didAddToLogger:(id <DDLogger>  __attribute__((unused)))logger {
+    int32_t count = 0;
+    count = OSAtomicIncrement32(&_atomicLoggerCount);
+    NSAssert(count <= 1 || _mode == DDDispatchQueueLogFormatterModeShareble, @"Can't reuse formatter with multiple loggers in non-shareable mode.");
+}
+
+- (void)willRemoveFromLogger:(id <DDLogger> __attribute__((unused)))logger {
+    OSAtomicDecrement32(&_atomicLoggerCount);
+}
+
+@end

Example/Pods/CocoaLumberjack/Classes/Extensions/DDMultiFormatter.h

@@ -0,0 +1,56 @@
+// Software License Agreement (BSD License)
+//
+// Copyright (c) 2010-2015, Deusty, LLC
+// All rights reserved.
+//
+// Redistribution and use of this software in source and binary forms,
+// with or without modification, are permitted provided that the following conditions are met:
+//
+// * Redistributions of source code must retain the above copyright notice,
+//   this list of conditions and the following disclaimer.
+//
+// * Neither the name of Deusty nor the names of its contributors may be used
+//   to endorse or promote products derived from this software without specific
+//   prior written permission of Deusty, LLC.
+
+#import <Foundation/Foundation.h>
+
+// Disable legacy macros
+#ifndef DD_LEGACY_MACROS
+    #define DD_LEGACY_MACROS 0
+#endif
+
+#import "DDLog.h"
+
+/**
+ * This formatter can be used to chain different formatters together.
+ * The log message will processed in the order of the formatters added.
+ **/
+@interface DDMultiFormatter : NSObject <DDLogFormatter>
+
+/**
+ *  Array of chained formatters
+ */
+@property (readonly) NSArray *formatters;
+
+/**
+ *  Add a new formatter
+ */
+- (void)addFormatter:(id<DDLogFormatter>)formatter;
+
+/**
+ *  Remove a formatter
+ */
+- (void)removeFormatter:(id<DDLogFormatter>)formatter;
+
+/**
+ *  Remove all existing formatters
+ */
+- (void)removeAllFormatters;
+
+/**
+ *  Check if a certain formatter is used
+ */
+- (BOOL)isFormattingWithFormatter:(id<DDLogFormatter>)formatter;
+
+@end

Example/Pods/CocoaLumberjack/Classes/Extensions/DDMultiFormatter.m

@@ -0,0 +1,144 @@
+// Software License Agreement (BSD License)
+//
+// Copyright (c) 2010-2015, Deusty, LLC
+// All rights reserved.
+//
+// Redistribution and use of this software in source and binary forms,
+// with or without modification, are permitted provided that the following conditions are met:
+//
+// * Redistributions of source code must retain the above copyright notice,
+//   this list of conditions and the following disclaimer.
+//
+// * Neither the name of Deusty nor the names of its contributors may be used
+//   to endorse or promote products derived from this software without specific
+//   prior written permission of Deusty, LLC.
+
+#import "DDMultiFormatter.h"
+
+
+#if TARGET_OS_IOS
+// Compiling for iOS
+#if __IPHONE_OS_VERSION_MIN_REQUIRED >= 60000 // iOS 6.0 or later
+#define NEEDS_DISPATCH_RETAIN_RELEASE 0
+#else                                         // iOS 5.X or earlier
+#define NEEDS_DISPATCH_RETAIN_RELEASE 1
+#endif
+#elif TARGET_OS_WATCH || TARGET_OS_TV
+// Compiling for watchOS, tvOS
+#define NEEDS_DISPATCH_RETAIN_RELEASE 0
+#else
+// Compiling for Mac OS X
+#if MAC_OS_X_VERSION_MIN_REQUIRED >= 1080     // Mac OS X 10.8 or later
+#define NEEDS_DISPATCH_RETAIN_RELEASE 0
+#else                                         // Mac OS X 10.7 or earlier
+#define NEEDS_DISPATCH_RETAIN_RELEASE 1
+#endif
+#endif
+
+
+#if !__has_feature(objc_arc)
+#error This file must be compiled with ARC. Use -fobjc-arc flag (or convert project to ARC).
+#endif
+
+
+@interface DDMultiFormatter () {
+    dispatch_queue_t _queue;
+    NSMutableArray *_formatters;
+}
+
+- (DDLogMessage *)logMessageForLine:(NSString *)line originalMessage:(DDLogMessage *)message;
+
+@end
+
+
+@implementation DDMultiFormatter
+
+- (instancetype)init {
+    self = [super init];
+
+    if (self) {
+#if MAC_OS_X_VERSION_MIN_REQUIRED >= 1070
+        _queue = dispatch_queue_create("cocoa.lumberjack.multiformatter", DISPATCH_QUEUE_CONCURRENT);
+#else
+        _queue = dispatch_queue_create("cocoa.lumberjack.multiformatter", NULL);
+#endif
+        _formatters = [NSMutableArray new];
+    }
+
+    return self;
+}
+
+#if NEEDS_DISPATCH_RETAIN_RELEASE
+- (void)dealloc {
+    dispatch_release(_queue);
+}
+
+#endif
+
+#pragma mark Processing
+
+- (NSString *)formatLogMessage:(DDLogMessage *)logMessage {
+    __block NSString *line = logMessage->_message;
+
+    dispatch_sync(_queue, ^{
+        for (id<DDLogFormatter> formatter in _formatters) {
+            DDLogMessage *message = [self logMessageForLine:line originalMessage:logMessage];
+            line = [formatter formatLogMessage:message];
+
+            if (!line) {
+                break;
+            }
+        }
+    });
+
+    return line;
+}
+
+- (DDLogMessage *)logMessageForLine:(NSString *)line originalMessage:(DDLogMessage *)message {
+    DDLogMessage *newMessage = [message copy];
+
+    newMessage->_message = line;
+    return newMessage;
+}
+
+#pragma mark Formatters
+
+- (NSArray *)formatters {
+    __block NSArray *formatters;
+
+    dispatch_sync(_queue, ^{
+        formatters = [_formatters copy];
+    });
+
+    return formatters;
+}
+
+- (void)addFormatter:(id<DDLogFormatter>)formatter {
+    dispatch_barrier_async(_queue, ^{
+        [_formatters addObject:formatter];
+    });
+}
+
+- (void)removeFormatter:(id<DDLogFormatter>)formatter {
+    dispatch_barrier_async(_queue, ^{
+        [_formatters removeObject:formatter];
+    });
+}
+
+- (void)removeAllFormatters {
+    dispatch_barrier_async(_queue, ^{
+        [_formatters removeAllObjects];
+    });
+}
+
+- (BOOL)isFormattingWithFormatter:(id<DDLogFormatter>)formatter {
+    __block BOOL hasFormatter;
+
+    dispatch_sync(_queue, ^{
+        hasFormatter = [_formatters containsObject:formatter];
+    });
+
+    return hasFormatter;
+}
+
+@end