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The Swift logging framework.

Atlantis is an extremely powerful logging framework that I've created for everyday use, including enterprise development for aspiring start-ups or for rapid prototyping API's. It is type agnostic, meaning you can pass in anything from strings to customobjects that you yourself made... and it will basically pretty print all the values within that object or literally anything in general. It is made with exceptional readability and ease of use.

Installation

Add this to your podfile...

# for Swift 4.0
pod 'Atlantis', :git => 'https://github.com/aaronjsutton/Atlantis.git', :branch => 'swift-4-patch'
# for Swift 3.0
pod 'Atlantis'
# for Swift 2.3
pod 'Atlantis', :git => 'https://github.com/DrewKiino/Atlantis.git', :branch => 'swift2.3'

Then do a pod install, and voila!

Unique Logs

This includes the stamp trace of the log's date, source, function, line number, as well as the actual type of the value.

Note: The date's format goes by month, date, year, hour, then time of day.

// You do not need to initialize this, the variable is initialized in file.
let log = Atlantis.Logger()

// Let's log some stuff
log.verbose("Hello, World!")
log.info("Hello, World!")
log.warning("Hello, World!")
log.debug("Hello, World!")
log.error("Hello, World!")

Which prints the following...

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Powerful Printing

Atlantis is built to pretty print literally everything.

- proper text alignment

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Atlantis automatically aligns its logs based on it's previous alignments. However you can change this configuration by setting this variable,

Atlantis.Configuration.alignmentThreshold

which defaults to 5.

- optionals

Atlantis will safely unwrap any optionals.

let doIExist: String? = nil

log.warning(doIExist)

// prints 'nil'

- empty strings

Atlantis will visually print empty strings.

let emptyString: String = ""

log.warning(emptyString)

// prints ""

- native types

let string = "Hello, World"
let int = 123
let double = 12.3
let float = 12.3
let bool = true

// you can either log one value
log.debug(string)

// or all of them like so,
log.debug(string, int, double, float, bool)

// prints
"Hello, World" // first one

"Hello, World" // prints each with a new line
123
12.3
12.3
true

- arrays

// array of ints
let numbers = [123, 1234, 12345]

log.debug(numbers)

// prints
[
	123,
	1234,
	12345
]

// lets try arrays of arrays
let numberArray = [[1, 2, 3], [4, 5]]

log.debug(numberArray)

// prints
[
	[
		1,
		2,
		3
	],
	[
		4,
		5
	]
]

- dictionaries

// on to dictionaries...
let dictionary: [String: AnyObject] = [
	"quote": "It is better to have loved, than to have never loved at all?"
]

log.debug(dictionary)

// prints
[
	"quote": "It is better to have loved, than to have never loved at all?"
]

// how about NSDictionary types?
var dictionary = NSDictionary()
dictionary.updateValue("will this work?", key: "question")

log.debug(dictionary)

// prints
[
	"question": "will  this work?"
]

// say we got two response objects from the server,
// now both objects are the same but one of them has missing data...

responses.map { log.debug($0) }

// prints
{
	"response": "Here is some data!",
	"success" 200
},
{
	"response": null,
	"success" 200
}

// Atlantis will print all of the object's keys regardless of missing
// or empty values and will print null if need be.

- objects

// now let's get to the fun part,

// native Foundation (ex: UIView, UIColor, etc.)

log.debug(UIColor())

// prints
<UIPlaceholderColor: 0x7ff1fb517ab0>

// native NSObjects

public class Dog: NSObject {
  var name = "Doug"
}

let dog = Dog()

log.debug(dog)

// prints
{
	"name": "Doug"
}

// But what about objects you created with no native subclasses?

public class CustomObject {
	var id: Int = 123
	var name: String = "Ben"
}

let customObject = CustomObject()

log.debug(customObject)

// prints
{
	"id": 123,
	"name": "Doug"
}

// Haha, no way?

// Alright, well how about custom objects with custom objects in them?

public class ParentObject {
	var id: Int = 456
	var name: String = "Tammy"
	var customObject: CustomObject = CustomObject()
}

let parentObject = ParentObject()

log.debug(parentObject)

// prints
{
	"id": 456,
	"name": "Tammy"
	"customObject": {
		"id": 123,
		"name": "Doug"
	}
}

// That's right.

// Okay, custom objects with an array of custom objects. ;)

public class ParentObject {
	var id: Int = 456
	var name: String = "Tammy"
	var customObjects: [CustomObject] = [CustomObject(), CustomObject()]
}

let parentObject = ParentObject()

log.debug(parentObject)

// prints
{
	"id": 456,
	"name": "Tammy"
	"customObjects": [
		{
			"id": 123,
			"name": "Doug"
		},
		{
			"id": 123,
			"name": "Doug"
		}
	]
}

// Not impressed?

let parentObject1 = ParentObject()
let parentObject2 = ParentObject() // one of its child has a dictionary

let parents: [ParentObject] = [parentObject1, parentObject2]

log.debug(parents)

// prints
[
	{
		"id": 456,
		"name": "Tammy"
		"customObjects": [
			{
				"id": 123,
				"name": "Doug"
			},
			{
				"id": 123,
				"name": "Doug"
			}
		]
	},
	{
		"id": 456,
		"name": "Tammy"
		"customObjects": [
			{
				"id": 123,
				"name": "Doug"
			},
			{
				"id": 123,
				"name": "Doug"
				"dictionary": [
					"likes": "baseball",
					"dislikes": "pad thai"
				]
			}
		]
	}
]

// Atlantis' logging is infinitely and ambiguously recursive,
// it supports almost all data types including arrays, dictionaries,
// and any objects within any objects. 👍🏼

- Structs

// Great!! Now on to some more stand-alone but much needed types.

struct Struct {
  var name: String = "Bob the Builder"
  var skills: [String] = ["structures, buildings"]
}

log.debug(Struct())

// prints
{
  "skills" : [
    "structures, buildings"
  ],
  "name" : "Bob the Builder"
}

- Enum

enum ErrorType {
	case Severe
	case Moderate
	case Casual
}

let type: ErrorType = .Severe

log.debug(type)

// prints
Severe

// one more example.

log.debug(ErrorType.Moderate)
log.debug(ErrorType.Casual)

// prints
Moderate
Casual

Error Handling

Atlantis will print all errors like so,

Error: [ViewController.swift/viewDidLoad()/line:98]
{
  "code" : 404,
  "localizedDescription" : "The operation couldn’t be completed. (Hello, World! error 404.)",
  "domain" : "Hello, World!",
  "userInfo" : {
  	"error": "found"
  	"note": "syntax"
  }
}

It will automatically parse the localized description, error code, domain, and user info from the NSError object.

Atlantis.Configuration.highlightsErrors // default false

By default, Atlantis will print all logs equally in white or in color if colored logging is enabled. However, if you enable error highlighting it will always highlight errors regardless of any set parameters.

Atlantis.Configuration.filteredErrorCodes

Atlantis has the ability to filter out errors based on their error code. For example, you have a method that sends requests to the network and you made it so it can only make one request at a time so it will always cancel the last request made. However, some APIs are out of our control and will send out errors without your permission.

Say you want to filter out error code -1099 // offline error,

Atlantis.Configuration.filteredErrorCodes.append(-1099)

// let's call a method that throws errors, however one of the
// errors is something we want to filter out.
method() { error in
	log.error(error) // can either be error 404 or -1099?
}

// will only print the error if the error code is 404

Now, if the method throws a -1099 error, Atlantis will will skip over it!

.Tap

Tap is an Atlantis extension that allows you to print like how you would regularly do, but will return the value of the input.

func add(x: Int, _ y: Int) -> Int { return x + y }

let addXY = log.tap.debug(add(3, 5))

// prints 8 and assigns the value to addXY

Normal extensions such as .Verbose etc. are also under .Tap

Compatible with Promises

using PromiseKit more specifically...

func promise() -> Promise<String> {
  return Promise { fulfill, reject in
    // blah blah
    fulfill("Hello from server!")
  }
}

promise()
.then { log.tap($0) }
.then { reply in
  // blah blah
}
.catch { log.error($0) }

// prints "Hello from server!" while completing the promise.

Note that .Tap can only take in single inputs.

Configuration

Levels

Atlantis.Configuration.logLevel // default .Verbose

The five log levels are: Verbose, Info, Warning, Debug, Error, and None, ordered by priority.

For example, if you set the log level to Debug, Atlantis will only print logs whose levels are Debug and Error.

Setting the log level to .None means Atlantis will skip all log execution. I recommend using this when the app is shift off to production.

Source Information

Atlantis.Configuration.showExtraInfo // default true

You can also hide the source details by setting this parameter to false.

Coloring

Atlantis is able to provide full color customization,

// colors
Atlantis.Configuration.hasColoredLogs // default false
Atlantis.Configuration.hasWhiteBackground // default false
Atlantis.Configuration.coloredLogLevels // default [.Verbose, .Info, .Warning, .Debug, .Error]

// using a Tuple initializer

Atlantis.Configuration.logColors.info = Atlantis.XCodeColor(fg: (Int, Int, Int)>, bg: <(Int, Int, Int)>)

// using UIColor setting only the foreground

Atlantis.Configuration.logColors.info = Atlantis.XCodeColor(fg: UIColor)

// or using UIColor setting both the foreground and background

Atlantis.Configuration.logColors.debug = Atlantis.XCodeColor(fg: UIColor, bg: UIColor)

By default, Atlantis doesn't print its logs in colors. if you want colors, you will need to set the configuration during launch.

However, for you to enable log colors you will have to first download the xcode package manager Alcatraz and enable it inside xcode. Pull up the package manager afterwards and install XCodeColors.

Afterword

To Do

  1. create a logging framework
  2. add color customization
  3. print to a text file when used on a device
  4. pretty print json types from server responses

License

The MIT License (MIT)

Copyright (c) 2015 Andrew Aquino http://drewkiino.github.io/

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.