diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index b7be6cf..7e36ce1 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -10,6 +10,15 @@ on:
     - cron: "20 23 * * 4"
 
 jobs:
+  lint:
+    runs-on: ubuntu-18.04
+    steps:
+      - uses: actions/checkout@v1
+      - name: Python Code Quality and Lint
+        uses: ricardochaves/python-lint@v1.1.0
+        with:
+          python-root-list: "timelapse"
+
   build:
     runs-on: macos-latest
     steps:
diff --git a/.gitignore b/.gitignore
index a38b404..3721e9b 100644
--- a/.gitignore
+++ b/.gitignore
@@ -5,3 +5,4 @@ venv
 dist
 .eggs
 build
+Timelapse.egg-info
diff --git a/Makefile b/Makefile
index 2f5cd5f..646dbc6 100644
--- a/Makefile
+++ b/Makefile
@@ -18,12 +18,16 @@ install: ## Install app dependencies
 
 .PHONY: run
 run: clean ## Run application in shell
-	poetry run timelapse
+	poetry run
 
 .PHONY: test
 test: clean ## Run pytest
 	poetry run pytest
 
+.PHONY: lint
+lint: ## Lint project code
+	poetry run pylint timelapse
+
 .PHONY: open
 open: ## Open project folder in Finder
 	open .
diff --git a/poetry.lock b/poetry.lock
index 475b4ef..e3a30c6 100644
--- a/poetry.lock
+++ b/poetry.lock
@@ -6,6 +6,23 @@ optional = false
 python-versions = "*"
 version = "0.17"
 
+[[package]]
+category = "dev"
+description = "An abstract syntax tree for Python with inference support."
+name = "astroid"
+optional = false
+python-versions = ">=3.5.*"
+version = "2.3.3"
+
+[package.dependencies]
+lazy-object-proxy = ">=1.4.0,<1.5.0"
+six = ">=1.12,<2.0"
+wrapt = ">=1.11.0,<1.12.0"
+
+[package.dependencies.typed-ast]
+python = "<3.8"
+version = ">=1.4.0,<1.5"
+
 [[package]]
 category = "dev"
 description = "Atomic file writes."
@@ -28,17 +45,6 @@ dev = ["coverage", "hypothesis", "pympler", "pytest (>=4.3.0)", "six", "zope.int
 docs = ["sphinx", "zope.interface"]
 tests = ["coverage", "hypothesis", "pympler", "pytest (>=4.3.0)", "six", "zope.interface"]
 
-[[package]]
-category = "dev"
-description = "A tool that automatically formats Python code to conform to the PEP 8 style guide"
-name = "autopep8"
-optional = false
-python-versions = "*"
-version = "1.5"
-
-[package.dependencies]
-pycodestyle = ">=2.5.0"
-
 [[package]]
 category = "dev"
 description = "Cross-platform colored terminal text."
@@ -64,6 +70,28 @@ zipp = ">=0.5"
 docs = ["sphinx", "rst.linker"]
 testing = ["packaging", "importlib-resources"]
 
+[[package]]
+category = "dev"
+description = "A Python utility / library to sort Python imports."
+name = "isort"
+optional = false
+python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
+version = "4.3.21"
+
+[package.extras]
+pipfile = ["pipreqs", "requirementslib"]
+pyproject = ["toml"]
+requirements = ["pipreqs", "pip-api"]
+xdg_home = ["appdirs (>=1.4.0)"]
+
+[[package]]
+category = "dev"
+description = "A fast and thorough lazy object proxy."
+name = "lazy-object-proxy"
+optional = false
+python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
+version = "1.4.3"
+
 [[package]]
 category = "dev"
 description = "Mach-O header analysis and editing"
@@ -75,6 +103,14 @@ version = "1.14"
 [package.dependencies]
 altgraph = ">=0.15"
 
+[[package]]
+category = "dev"
+description = "McCabe checker, plugin for flake8"
+name = "mccabe"
+optional = false
+python-versions = "*"
+version = "0.6.1"
+
 [[package]]
 category = "dev"
 description = "Python module dependency analysis tool"
@@ -134,11 +170,17 @@ modulegraph = ">=0.17"
 
 [[package]]
 category = "dev"
-description = "Python style guide checker"
-name = "pycodestyle"
+description = "python code static checker"
+name = "pylint"
 optional = false
-python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
-version = "2.5.0"
+python-versions = ">=3.5.*"
+version = "2.4.4"
+
+[package.dependencies]
+astroid = ">=2.3.0,<2.4"
+colorama = "*"
+isort = ">=4.2.5,<5"
+mccabe = ">=0.6,<0.7"
 
 [[package]]
 category = "main"
@@ -278,6 +320,7 @@ version = "6.1"
 [[package]]
 category = "main"
 description = "Wrappers for the framework Accounts on macOS"
+marker = "platform_release >= \"12.0\" or platform_release >= \"14.0\""
 name = "pyobjc-framework-accounts"
 optional = false
 python-versions = ">=3.6"
@@ -302,6 +345,7 @@ pyobjc-framework-Cocoa = ">=6.1"
 [[package]]
 category = "main"
 description = "Wrappers for the framework AdSupport on macOS"
+marker = "platform_release >= \"18.0\""
 name = "pyobjc-framework-adsupport"
 optional = false
 python-versions = ">=3.6"
@@ -326,6 +370,7 @@ pyobjc-framework-Cocoa = ">=6.1"
 [[package]]
 category = "main"
 description = "Wrappers for the framework AppleScriptObjC on macOS"
+marker = "platform_release >= \"10.0\""
 name = "pyobjc-framework-applescriptobjc"
 optional = false
 python-versions = ">=3.6"
@@ -376,6 +421,7 @@ pyobjc-framework-Cocoa = ">=6.1"
 [[package]]
 category = "main"
 description = "Wrappers for the framework AVFoundation on macOS"
+marker = "platform_release >= \"11.0\" or platform_release >= \"16.0\""
 name = "pyobjc-framework-avfoundation"
 optional = false
 python-versions = ">=3.6"
@@ -390,6 +436,7 @@ pyobjc-framework-Quartz = ">=6.1"
 [[package]]
 category = "main"
 description = "Wrappers for the framework AVKit on macOS"
+marker = "platform_release >= \"13.0\""
 name = "pyobjc-framework-avkit"
 optional = false
 python-versions = ">=3.6"
@@ -403,6 +450,7 @@ pyobjc-framework-Quartz = ">=6.1"
 [[package]]
 category = "main"
 description = "Wrappers for the framework BusinessChat on macOS"
+marker = "platform_release >= \"18.0\""
 name = "pyobjc-framework-businesschat"
 optional = false
 python-versions = ">=3.6"
@@ -415,6 +463,7 @@ pyobjc-framework-Cocoa = ">=6.1"
 [[package]]
 category = "main"
 description = "Wrappers for the framework CalendarStore on macOS"
+marker = "platform_release >= \"9.0\""
 name = "pyobjc-framework-calendarstore"
 optional = false
 python-versions = ">=3.6"
@@ -439,6 +488,7 @@ pyobjc-framework-Cocoa = ">=6.1"
 [[package]]
 category = "main"
 description = "Wrappers for the framework CloudKit on macOS"
+marker = "platform_release >= \"14.0\""
 name = "pyobjc-framework-cloudkit"
 optional = false
 python-versions = ">=3.6"
@@ -465,6 +515,7 @@ pyobjc-core = ">=6.1"
 [[package]]
 category = "main"
 description = "Wrappers for the framework Collaboration on macOS"
+marker = "platform_release >= \"9.0\""
 name = "pyobjc-framework-collaboration"
 optional = false
 python-versions = ">=3.6"
@@ -477,6 +528,7 @@ pyobjc-framework-Cocoa = ">=6.1"
 [[package]]
 category = "main"
 description = "Wrappers for the framework ColorSync on Mac OS X"
+marker = "platform_release >= \"17.0\""
 name = "pyobjc-framework-colorsync"
 optional = false
 python-versions = ">=3.6"
@@ -489,6 +541,7 @@ pyobjc-framework-Cocoa = ">=6.1"
 [[package]]
 category = "main"
 description = "Wrappers for the framework Contacts on macOS"
+marker = "platform_release >= \"15.0\""
 name = "pyobjc-framework-contacts"
 optional = false
 python-versions = ">=3.6"
@@ -501,6 +554,7 @@ pyobjc-framework-Cocoa = ">=6.1"
 [[package]]
 category = "main"
 description = "Wrappers for the framework ContactsUI on macOS"
+marker = "platform_release >= \"15.0\""
 name = "pyobjc-framework-contactsui"
 optional = false
 python-versions = ">=3.6"
@@ -539,6 +593,7 @@ pyobjc-framework-CoreAudio = ">=6.1"
 [[package]]
 category = "main"
 description = "Wrappers for the framework CoreBluetooth on macOS"
+marker = "platform_release >= \"14.0\""
 name = "pyobjc-framework-corebluetooth"
 optional = false
 python-versions = ">=3.6"
@@ -576,6 +631,7 @@ pyobjc-framework-Cocoa = ">=6.1"
 [[package]]
 category = "main"
 description = "Wrappers for the framework CoreLocation on macOS"
+marker = "platform_release >= \"10.0\" or platform_release >= \"13.0\" or platform_release >= \"14.0\""
 name = "pyobjc-framework-corelocation"
 optional = false
 python-versions = ">=3.6"
@@ -588,6 +644,7 @@ pyobjc-framework-Cocoa = ">=6.1"
 [[package]]
 category = "main"
 description = "Wrappers for the framework CoreMedia on macOS"
+marker = "platform_release >= \"11.0\" or platform_release >= \"16.0\" or platform_release >= \"12.0\" or platform_release >= \"19.0\""
 name = "pyobjc-framework-coremedia"
 optional = false
 python-versions = ">=3.6"
@@ -600,6 +657,7 @@ pyobjc-framework-Cocoa = ">=6.1"
 [[package]]
 category = "main"
 description = "Wrappers for the framework CoreMediaIO on macOS"
+marker = "platform_release >= \"11.0\""
 name = "pyobjc-framework-coremediaio"
 optional = false
 python-versions = ">=3.6"
@@ -612,6 +670,7 @@ pyobjc-framework-Cocoa = ">=6.1"
 [[package]]
 category = "main"
 description = "Wrappers for the framework CoreML on macOS"
+marker = "platform_release >= \"17.0\""
 name = "pyobjc-framework-coreml"
 optional = false
 python-versions = ">=3.6"
@@ -649,6 +708,7 @@ pyobjc-framework-FSEvents = ">=6.1"
 [[package]]
 category = "main"
 description = "Wrappers for the framework CoreSpotlight on macOS"
+marker = "platform_release >= \"17.0\""
 name = "pyobjc-framework-corespotlight"
 optional = false
 python-versions = ">=3.6"
@@ -674,6 +734,7 @@ pyobjc-framework-Quartz = ">=6.1"
 [[package]]
 category = "main"
 description = "Wrappers for the framework CoreWLAN on macOS"
+marker = "platform_release >= \"10.0\""
 name = "pyobjc-framework-corewlan"
 optional = false
 python-versions = ">=3.6"
@@ -686,6 +747,7 @@ pyobjc-framework-Cocoa = ">=6.1"
 [[package]]
 category = "main"
 description = "Wrappers for the framework CryptoTokenKit on macOS"
+marker = "platform_release >= \"14.0\""
 name = "pyobjc-framework-cryptotokenkit"
 optional = false
 python-versions = ">=3.6"
@@ -711,6 +773,7 @@ pyobjc-framework-Cocoa = ">=6.1"
 [[package]]
 category = "main"
 description = "Wrappers for the framework DictionaryServices on macOS"
+marker = "platform_release >= \"9.0\""
 name = "pyobjc-framework-dictionaryservices"
 optional = false
 python-versions = ">=3.6"
@@ -772,6 +835,7 @@ pyobjc-framework-Cocoa = ">=6.1"
 [[package]]
 category = "main"
 description = "Wrappers for the framework Accounts on macOS"
+marker = "platform_release >= \"12.0\""
 name = "pyobjc-framework-eventkit"
 optional = false
 python-versions = ">=3.6"
@@ -809,6 +873,7 @@ pyobjc-framework-Cocoa = ">=6.1"
 [[package]]
 category = "main"
 description = "Wrappers for the framework ExternalAccessory on macOS"
+marker = "platform_release >= \"17.0\""
 name = "pyobjc-framework-externalaccessory"
 optional = false
 python-versions = ">=3.6"
@@ -847,6 +912,7 @@ pyobjc-framework-FileProvider = ">=6.1"
 [[package]]
 category = "main"
 description = "Wrappers for the framework FinderSync on macOS"
+marker = "platform_release >= \"14.0\""
 name = "pyobjc-framework-findersync"
 optional = false
 python-versions = ">=3.6"
@@ -871,6 +937,7 @@ pyobjc-framework-Cocoa = ">=6.1"
 [[package]]
 category = "main"
 description = "Wrappers for the framework GameCenter on macOS"
+marker = "platform_release >= \"12.0\""
 name = "pyobjc-framework-gamecenter"
 optional = false
 python-versions = ">=3.6"
@@ -883,6 +950,7 @@ pyobjc-framework-Cocoa = ">=6.1"
 [[package]]
 category = "main"
 description = "Wrappers for the framework GameController on macOS"
+marker = "platform_release >= \"13.0\""
 name = "pyobjc-framework-gamecontroller"
 optional = false
 python-versions = ">=3.6"
@@ -895,6 +963,7 @@ pyobjc-framework-Cocoa = ">=6.1"
 [[package]]
 category = "main"
 description = "Wrappers for the framework GameKit on macOS"
+marker = "platform_release >= \"12.0\""
 name = "pyobjc-framework-gamekit"
 optional = false
 python-versions = ">=3.6"
@@ -908,6 +977,7 @@ pyobjc-framework-Quartz = ">=6.1"
 [[package]]
 category = "main"
 description = "Wrappers for the framework GameplayKit on macOS"
+marker = "platform_release >= \"15.0\""
 name = "pyobjc-framework-gameplaykit"
 optional = false
 python-versions = ">=3.6"
@@ -921,6 +991,7 @@ pyobjc-framework-SpriteKit = ">=6.1"
 [[package]]
 category = "main"
 description = "Wrappers for the framework ImageCaptureCore on macOS"
+marker = "platform_release >= \"10.0\""
 name = "pyobjc-framework-imagecapturecore"
 optional = false
 python-versions = ">=3.6"
@@ -933,6 +1004,7 @@ pyobjc-framework-Cocoa = ">=6.1"
 [[package]]
 category = "main"
 description = "Wrappers for the framework IMServicePlugIn on macOS"
+marker = "platform_release >= \"11.0\""
 name = "pyobjc-framework-imserviceplugin"
 optional = false
 python-versions = ">=3.6"
@@ -945,6 +1017,7 @@ pyobjc-framework-Cocoa = ">=6.1"
 [[package]]
 category = "main"
 description = "Wrappers for the framework InputMethodKit on macOS"
+marker = "platform_release >= \"9.0\""
 name = "pyobjc-framework-inputmethodkit"
 optional = false
 python-versions = ">=3.6"
@@ -969,6 +1042,7 @@ pyobjc-framework-Cocoa = ">=6.1"
 [[package]]
 category = "main"
 description = "Wrappers for the framework InstantMessage on macOS"
+marker = "platform_release >= \"9.0\""
 name = "pyobjc-framework-instantmessage"
 optional = false
 python-versions = ">=3.6"
@@ -982,6 +1056,7 @@ pyobjc-framework-Quartz = ">=6.1"
 [[package]]
 category = "main"
 description = "Wrappers for the framework Intents on macOS"
+marker = "platform_release >= \"16.0\""
 name = "pyobjc-framework-intents"
 optional = false
 python-versions = ">=3.6"
@@ -1007,6 +1082,7 @@ pyobjc-framework-Cocoa = ">=6.1"
 [[package]]
 category = "main"
 description = "Wrappers for the framework IOSurface on macOS"
+marker = "platform_release >= \"10.0\""
 name = "pyobjc-framework-iosurface"
 optional = false
 python-versions = ">=3.6"
@@ -1019,6 +1095,7 @@ pyobjc-framework-Cocoa = ">=6.1"
 [[package]]
 category = "main"
 description = "Wrappers for the framework iTunesLibrary on macOS"
+marker = "platform_release >= \"10.0\""
 name = "pyobjc-framework-ituneslibrary"
 optional = false
 python-versions = ">=3.6"
@@ -1055,6 +1132,7 @@ pyobjc-framework-CoreServices = ">=6.1"
 [[package]]
 category = "main"
 description = "Wrappers for libdispatch on macOS"
+marker = "platform_release >= \"12.0\""
 name = "pyobjc-framework-libdispatch"
 optional = false
 python-versions = ">=3.6"
@@ -1080,6 +1158,7 @@ pyobjc-framework-Quartz = ">=6.1"
 [[package]]
 category = "main"
 description = "Wrappers for the framework LocalAuthentication on macOS"
+marker = "platform_release >= \"14.0\""
 name = "pyobjc-framework-localauthentication"
 optional = false
 python-versions = ">=3.6"
@@ -1092,6 +1171,7 @@ pyobjc-framework-Cocoa = ">=6.1"
 [[package]]
 category = "main"
 description = "Wrappers for the framework MapKit on macOS"
+marker = "platform_release >= \"13.0\""
 name = "pyobjc-framework-mapkit"
 optional = false
 python-versions = ">=3.6"
@@ -1106,6 +1186,7 @@ pyobjc-framework-Quartz = ">=6.1"
 [[package]]
 category = "main"
 description = "Wrappers for the framework MediaAccessibility on macOS"
+marker = "platform_release >= \"13.0\""
 name = "pyobjc-framework-mediaaccessibility"
 optional = false
 python-versions = ">=3.6"
@@ -1118,6 +1199,7 @@ pyobjc-framework-Cocoa = ">=6.1"
 [[package]]
 category = "main"
 description = "Wrappers for the framework MediaLibrary on macOS"
+marker = "platform_release >= \"13.0\""
 name = "pyobjc-framework-medialibrary"
 optional = false
 python-versions = ">=3.6"
@@ -1131,6 +1213,7 @@ pyobjc-framework-Quartz = ">=6.1"
 [[package]]
 category = "main"
 description = "Wrappers for the framework MediaPlayer on macOS"
+marker = "platform_release >= \"16.0\""
 name = "pyobjc-framework-mediaplayer"
 optional = false
 python-versions = ">=3.6"
@@ -1143,6 +1226,7 @@ pyobjc-framework-AVFoundation = ">=6.1"
 [[package]]
 category = "main"
 description = "Wrappers for the framework MediaToolbox on macOS"
+marker = "platform_release >= \"13.0\""
 name = "pyobjc-framework-mediatoolbox"
 optional = false
 python-versions = ">=3.6"
@@ -1168,6 +1252,7 @@ pyobjc-framework-Cocoa = ">=6.1"
 [[package]]
 category = "main"
 description = "Wrappers for the framework MetalKit on macOS"
+marker = "platform_release >= \"15.0\""
 name = "pyobjc-framework-metalkit"
 optional = false
 python-versions = ">=3.6"
@@ -1180,6 +1265,7 @@ pyobjc-framework-Cocoa = ">=6.1"
 [[package]]
 category = "main"
 description = "Wrappers for the framework ModelIO on macOS"
+marker = "platform_release >= \"15.0\""
 name = "pyobjc-framework-modelio"
 optional = false
 python-versions = ">=3.6"
@@ -1193,6 +1279,7 @@ pyobjc-framework-Quartz = ">=6.1"
 [[package]]
 category = "main"
 description = "Wrappers for the framework MultipeerConnectivity on macOS"
+marker = "platform_release >= \"14.0\""
 name = "pyobjc-framework-multipeerconnectivity"
 optional = false
 python-versions = ">=3.6"
@@ -1205,6 +1292,7 @@ pyobjc-framework-Cocoa = ">=6.1"
 [[package]]
 category = "main"
 description = "Wrappers for the framework NaturalLanguage on macOS"
+marker = "platform_release >= \"18.0\""
 name = "pyobjc-framework-naturallanguage"
 optional = false
 python-versions = ">=3.6"
@@ -1217,6 +1305,7 @@ pyobjc-framework-Cocoa = ">=6.1"
 [[package]]
 category = "main"
 description = "Wrappers for the framework NetFS on macOS"
+marker = "platform_release >= \"10.0\""
 name = "pyobjc-framework-netfs"
 optional = false
 python-versions = ">=3.6"
@@ -1229,6 +1318,7 @@ pyobjc-framework-Cocoa = ">=6.1"
 [[package]]
 category = "main"
 description = "Wrappers for the framework Network on macOS"
+marker = "platform_release >= \"18.0\""
 name = "pyobjc-framework-network"
 optional = false
 python-versions = ">=3.6"
@@ -1241,6 +1331,7 @@ pyobjc-framework-Cocoa = ">=6.1"
 [[package]]
 category = "main"
 description = "Wrappers for the framework NetworkExtension on macOS"
+marker = "platform_release >= \"15.0\""
 name = "pyobjc-framework-networkextension"
 optional = false
 python-versions = ">=3.6"
@@ -1253,6 +1344,7 @@ pyobjc-framework-Cocoa = ">=6.1"
 [[package]]
 category = "main"
 description = "Wrappers for the framework NotificationCenter on macOS"
+marker = "platform_release >= \"14.0\""
 name = "pyobjc-framework-notificationcenter"
 optional = false
 python-versions = ">=3.6"
@@ -1265,6 +1357,7 @@ pyobjc-framework-Cocoa = ">=6.1"
 [[package]]
 category = "main"
 description = "Wrappers for the framework OpenDirectory on macOS"
+marker = "platform_release >= \"10.0\""
 name = "pyobjc-framework-opendirectory"
 optional = false
 python-versions = ">=3.6"
@@ -1317,6 +1410,7 @@ pyobjc-framework-Cocoa = ">=6.1"
 [[package]]
 category = "main"
 description = "Wrappers for the framework Photos on macOS"
+marker = "platform_release >= \"15.0\""
 name = "pyobjc-framework-photos"
 optional = false
 python-versions = ">=3.6"
@@ -1329,6 +1423,7 @@ pyobjc-framework-Cocoa = ">=6.1"
 [[package]]
 category = "main"
 description = "Wrappers for the framework PhotosUI on macOS"
+marker = "platform_release >= \"15.0\""
 name = "pyobjc-framework-photosui"
 optional = false
 python-versions = ">=3.6"
@@ -1353,6 +1448,7 @@ pyobjc-framework-Cocoa = ">=6.1"
 [[package]]
 category = "main"
 description = "Wrappers for the framework PubSub on macOS"
+marker = "platform_release >= \"9.0\""
 name = "pyobjc-framework-pubsub"
 optional = false
 python-versions = ">=3.6"
@@ -1378,6 +1474,7 @@ pyobjc-framework-Cocoa = ">=6.1"
 [[package]]
 category = "main"
 description = "Wrappers for the framework QTKit on macOS"
+marker = "platform_release >= \"9.0\" and platform_release < \"19.0\""
 name = "pyobjc-framework-qtkit"
 optional = false
 python-versions = ">=3.6"
@@ -1417,6 +1514,7 @@ pyobjc-framework-Quartz = ">=6.1"
 [[package]]
 category = "main"
 description = "Wrappers for the framework SafariServices on macOS"
+marker = "platform_release >= \"15.0\""
 name = "pyobjc-framework-safariservices"
 optional = false
 python-versions = ">=3.6"
@@ -1429,6 +1527,7 @@ pyobjc-framework-Cocoa = ">=6.1"
 [[package]]
 category = "main"
 description = "Wrappers for the framework SceneKit on macOS"
+marker = "platform_release >= \"11.0\""
 name = "pyobjc-framework-scenekit"
 optional = false
 python-versions = ">=3.6"
@@ -1454,6 +1553,7 @@ pyobjc-framework-Cocoa = ">=6.1"
 [[package]]
 category = "main"
 description = "Wrappers for the framework ScriptingBridge on macOS"
+marker = "platform_release >= \"9.0\""
 name = "pyobjc-framework-scriptingbridge"
 optional = false
 python-versions = ">=3.6"
@@ -1529,6 +1629,7 @@ pyobjc-framework-Cocoa = ">=6.1"
 [[package]]
 category = "main"
 description = "Wrappers for the framework ServiceManagement on macOS"
+marker = "platform_release >= \"10.0\""
 name = "pyobjc-framework-servicemanagement"
 optional = false
 python-versions = ">=3.6"
@@ -1541,6 +1642,7 @@ pyobjc-framework-Cocoa = ">=6.1"
 [[package]]
 category = "main"
 description = "Wrappers for the framework Social on macOS"
+marker = "platform_release >= \"12.0\""
 name = "pyobjc-framework-social"
 optional = false
 python-versions = ">=3.6"
@@ -1579,6 +1681,7 @@ pyobjc-framework-Cocoa = ">=6.1"
 [[package]]
 category = "main"
 description = "Wrappers for the framework SpriteKit on macOS"
+marker = "platform_release >= \"13.0\" or platform_release >= \"15.0\""
 name = "pyobjc-framework-spritekit"
 optional = false
 python-versions = ">=3.6"
@@ -1592,6 +1695,7 @@ pyobjc-framework-Quartz = ">=6.1"
 [[package]]
 category = "main"
 description = "Wrappers for the framework StoreKit on macOS"
+marker = "platform_release >= \"11.0\""
 name = "pyobjc-framework-storekit"
 optional = false
 python-versions = ">=3.6"
@@ -1642,6 +1746,7 @@ pyobjc-framework-Cocoa = ">=6.1"
 [[package]]
 category = "main"
 description = "Wrappers for the framework UserNotifications on macOS"
+marker = "platform_release >= \"18.0\""
 name = "pyobjc-framework-usernotifications"
 optional = false
 python-versions = ">=3.6"
@@ -1654,6 +1759,7 @@ pyobjc-framework-Cocoa = ">=6.1"
 [[package]]
 category = "main"
 description = "Wrappers for the framework VideoSubscriberAccount on macOS"
+marker = "platform_release >= \"18.0\""
 name = "pyobjc-framework-videosubscriberaccount"
 optional = false
 python-versions = ">=3.6"
@@ -1666,6 +1772,7 @@ pyobjc-framework-Cocoa = ">=6.1"
 [[package]]
 category = "main"
 description = "Wrappers for the framework VideoToolbox on macOS"
+marker = "platform_release >= \"12.0\""
 name = "pyobjc-framework-videotoolbox"
 optional = false
 python-versions = ">=3.6"
@@ -1680,6 +1787,7 @@ pyobjc-framework-Quartz = ">=6.1"
 [[package]]
 category = "main"
 description = "Wrappers for the framework Vision on macOS"
+marker = "platform_release >= \"17.0\""
 name = "pyobjc-framework-vision"
 optional = false
 python-versions = ">=3.6"
@@ -1742,6 +1850,23 @@ optional = false
 python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*"
 version = "1.14.0"
 
+[[package]]
+category = "dev"
+description = "a fork of Python 2 and 3 ast modules with type comment support"
+marker = "implementation_name == \"cpython\" and python_version < \"3.8\""
+name = "typed-ast"
+optional = false
+python-versions = "*"
+version = "1.4.1"
+
+[[package]]
+category = "dev"
+description = "Module for decorators, wrappers and monkey patching."
+name = "wrapt"
+optional = false
+python-versions = "*"
+version = "1.11.2"
+
 [[package]]
 category = "dev"
 description = "Backport of pathlib-compatible object wrapper for zip files"
@@ -1749,14 +1874,14 @@ marker = "python_version < \"3.8\""
 name = "zipp"
 optional = false
 python-versions = ">=3.6"
-version = "2.1.0"
+version = "3.1.0"
 
 [package.extras]
 docs = ["sphinx", "jaraco.packaging (>=3.2)", "rst.linker (>=1.9)"]
-testing = ["jaraco.itertools"]
+testing = ["jaraco.itertools", "func-timeout"]
 
 [metadata]
-content-hash = "920bae03c7b89174acc76ba876f33f64c3b125ec63d4e5a77ae041f94adcd8b7"
+content-hash = "d83787f03cc4eaf16405a1ba81f5bee16475c320bf64cc75a5337992b84f3b4b"
 python-versions = "^3.6"
 
 [metadata.files]
@@ -1764,6 +1889,10 @@ altgraph = [
     {file = "altgraph-0.17-py2.py3-none-any.whl", hash = "sha256:c623e5f3408ca61d4016f23a681b9adb100802ca3e3da5e718915a9e4052cebe"},
     {file = "altgraph-0.17.tar.gz", hash = "sha256:1f05a47122542f97028caf78775a095fbe6a2699b5089de8477eb583167d69aa"},
 ]
+astroid = [
+    {file = "astroid-2.3.3-py3-none-any.whl", hash = "sha256:840947ebfa8b58f318d42301cf8c0a20fd794a33b61cc4638e28e9e61ba32f42"},
+    {file = "astroid-2.3.3.tar.gz", hash = "sha256:71ea07f44df9568a75d0f354c49143a4575d90645e9fead6dfb52c26a85ed13a"},
+]
 atomicwrites = [
     {file = "atomicwrites-1.3.0-py2.py3-none-any.whl", hash = "sha256:03472c30eb2c5d1ba9227e4c2ca66ab8287fbfbbda3888aa93dc2e28fc6811b4"},
     {file = "atomicwrites-1.3.0.tar.gz", hash = "sha256:75a9445bac02d8d058d5e1fe689654ba5a6556a1dfd8ce6ec55a0ed79866cfa6"},
@@ -1772,9 +1901,6 @@ attrs = [
     {file = "attrs-19.3.0-py2.py3-none-any.whl", hash = "sha256:08a96c641c3a74e44eb59afb61a24f2cb9f4d7188748e76ba4bb5edfa3cb7d1c"},
     {file = "attrs-19.3.0.tar.gz", hash = "sha256:f7b7ce16570fe9965acd6d30101a28f62fb4a7f9e926b3bbc9b61f8b04247e72"},
 ]
-autopep8 = [
-    {file = "autopep8-1.5.tar.gz", hash = "sha256:0f592a0447acea0c2b0a9602be1e4e3d86db52badd2e3c84f0193bfd89fd3a43"},
-]
 colorama = [
     {file = "colorama-0.4.3-py2.py3-none-any.whl", hash = "sha256:7d73d2a99753107a36ac6b455ee49046802e59d9d076ef8e47b61499fa29afff"},
     {file = "colorama-0.4.3.tar.gz", hash = "sha256:e96da0d330793e2cb9485e9ddfd918d456036c7149416295932478192f4436a1"},
@@ -1783,10 +1909,41 @@ importlib-metadata = [
     {file = "importlib_metadata-1.5.0-py2.py3-none-any.whl", hash = "sha256:b97607a1a18a5100839aec1dc26a1ea17ee0d93b20b0f008d80a5a050afb200b"},
     {file = "importlib_metadata-1.5.0.tar.gz", hash = "sha256:06f5b3a99029c7134207dd882428a66992a9de2bef7c2b699b5641f9886c3302"},
 ]
+isort = [
+    {file = "isort-4.3.21-py2.py3-none-any.whl", hash = "sha256:6e811fcb295968434526407adb8796944f1988c5b65e8139058f2014cbe100fd"},
+    {file = "isort-4.3.21.tar.gz", hash = "sha256:54da7e92468955c4fceacd0c86bd0ec997b0e1ee80d97f67c35a78b719dccab1"},
+]
+lazy-object-proxy = [
+    {file = "lazy-object-proxy-1.4.3.tar.gz", hash = "sha256:f3900e8a5de27447acbf900b4750b0ddfd7ec1ea7fbaf11dfa911141bc522af0"},
+    {file = "lazy_object_proxy-1.4.3-cp27-cp27m-macosx_10_13_x86_64.whl", hash = "sha256:a2238e9d1bb71a56cd710611a1614d1194dc10a175c1e08d75e1a7bcc250d442"},
+    {file = "lazy_object_proxy-1.4.3-cp27-cp27m-win32.whl", hash = "sha256:efa1909120ce98bbb3777e8b6f92237f5d5c8ea6758efea36a473e1d38f7d3e4"},
+    {file = "lazy_object_proxy-1.4.3-cp27-cp27m-win_amd64.whl", hash = "sha256:4677f594e474c91da97f489fea5b7daa17b5517190899cf213697e48d3902f5a"},
+    {file = "lazy_object_proxy-1.4.3-cp27-cp27mu-manylinux1_x86_64.whl", hash = "sha256:0c4b206227a8097f05c4dbdd323c50edf81f15db3b8dc064d08c62d37e1a504d"},
+    {file = "lazy_object_proxy-1.4.3-cp34-cp34m-manylinux1_x86_64.whl", hash = "sha256:d945239a5639b3ff35b70a88c5f2f491913eb94871780ebfabb2568bd58afc5a"},
+    {file = "lazy_object_proxy-1.4.3-cp34-cp34m-win32.whl", hash = "sha256:9651375199045a358eb6741df3e02a651e0330be090b3bc79f6d0de31a80ec3e"},
+    {file = "lazy_object_proxy-1.4.3-cp34-cp34m-win_amd64.whl", hash = "sha256:eba7011090323c1dadf18b3b689845fd96a61ba0a1dfbd7f24b921398affc357"},
+    {file = "lazy_object_proxy-1.4.3-cp35-cp35m-manylinux1_x86_64.whl", hash = "sha256:48dab84ebd4831077b150572aec802f303117c8cc5c871e182447281ebf3ac50"},
+    {file = "lazy_object_proxy-1.4.3-cp35-cp35m-win32.whl", hash = "sha256:ca0a928a3ddbc5725be2dd1cf895ec0a254798915fb3a36af0964a0a4149e3db"},
+    {file = "lazy_object_proxy-1.4.3-cp35-cp35m-win_amd64.whl", hash = "sha256:194d092e6f246b906e8f70884e620e459fc54db3259e60cf69a4d66c3fda3449"},
+    {file = "lazy_object_proxy-1.4.3-cp36-cp36m-manylinux1_x86_64.whl", hash = "sha256:97bb5884f6f1cdce0099f86b907aa41c970c3c672ac8b9c8352789e103cf3156"},
+    {file = "lazy_object_proxy-1.4.3-cp36-cp36m-win32.whl", hash = "sha256:cb2c7c57005a6804ab66f106ceb8482da55f5314b7fcb06551db1edae4ad1531"},
+    {file = "lazy_object_proxy-1.4.3-cp36-cp36m-win_amd64.whl", hash = "sha256:8d859b89baf8ef7f8bc6b00aa20316483d67f0b1cbf422f5b4dc56701c8f2ffb"},
+    {file = "lazy_object_proxy-1.4.3-cp37-cp37m-macosx_10_13_x86_64.whl", hash = "sha256:1be7e4c9f96948003609aa6c974ae59830a6baecc5376c25c92d7d697e684c08"},
+    {file = "lazy_object_proxy-1.4.3-cp37-cp37m-manylinux1_x86_64.whl", hash = "sha256:d74bb8693bf9cf75ac3b47a54d716bbb1a92648d5f781fc799347cfc95952383"},
+    {file = "lazy_object_proxy-1.4.3-cp37-cp37m-win32.whl", hash = "sha256:9b15f3f4c0f35727d3a0fba4b770b3c4ebbb1fa907dbcc046a1d2799f3edd142"},
+    {file = "lazy_object_proxy-1.4.3-cp37-cp37m-win_amd64.whl", hash = "sha256:9254f4358b9b541e3441b007a0ea0764b9d056afdeafc1a5569eee1cc6c1b9ea"},
+    {file = "lazy_object_proxy-1.4.3-cp38-cp38-manylinux1_x86_64.whl", hash = "sha256:a6ae12d08c0bf9909ce12385803a543bfe99b95fe01e752536a60af2b7797c62"},
+    {file = "lazy_object_proxy-1.4.3-cp38-cp38-win32.whl", hash = "sha256:5541cada25cd173702dbd99f8e22434105456314462326f06dba3e180f203dfd"},
+    {file = "lazy_object_proxy-1.4.3-cp38-cp38-win_amd64.whl", hash = "sha256:59f79fef100b09564bc2df42ea2d8d21a64fdcda64979c0fa3db7bdaabaf6239"},
+]
 macholib = [
     {file = "macholib-1.14-py2.py3-none-any.whl", hash = "sha256:c500f02867515e6c60a27875b408920d18332ddf96b4035ef03beddd782d4281"},
     {file = "macholib-1.14.tar.gz", hash = "sha256:0c436bc847e7b1d9bda0560351bf76d7caf930fb585a828d13608839ef42c432"},
 ]
+mccabe = [
+    {file = "mccabe-0.6.1-py2.py3-none-any.whl", hash = "sha256:ab8a6258860da4b6677da4bd2fe5dc2c659cff31b3ee4f7f5d64e79735b80d42"},
+    {file = "mccabe-0.6.1.tar.gz", hash = "sha256:dd8d182285a0fe56bace7f45b5e7d1a6ebcbf524e8f3bd87eb0f125271b8831f"},
+]
 modulegraph = [
     {file = "modulegraph-0.18-py2.py3-none-any.whl", hash = "sha256:60e58a96728fa741aac2800bf89cf89a59311c5bec336bd7a146a476446eb740"},
     {file = "modulegraph-0.18.tar.gz", hash = "sha256:11c03dac1368bb9e7f780b58d251a0880c30b5a14816b6f88ec5a6fe1e3e5611"},
@@ -1807,9 +1964,9 @@ py2app = [
     {file = "py2app-0.20-py2.py3-none-any.whl", hash = "sha256:916f9483bf733379a3a8f3216b95cef2dec6478e5b52182daab565ac2a6fc0cb"},
     {file = "py2app-0.20.tar.gz", hash = "sha256:46ce0a1551c621a976ba12b4fe4e655ab39339fa1e75784cdafb4295b269bb91"},
 ]
-pycodestyle = [
-    {file = "pycodestyle-2.5.0-py2.py3-none-any.whl", hash = "sha256:95a2219d12372f05704562a14ec30bc76b05a5b297b21a5dfe3f6fac3491ae56"},
-    {file = "pycodestyle-2.5.0.tar.gz", hash = "sha256:e40a936c9a450ad81df37f549d676d127b1b66000a6c500caa2b085bc0ca976c"},
+pylint = [
+    {file = "pylint-2.4.4-py3-none-any.whl", hash = "sha256:886e6afc935ea2590b462664b161ca9a5e40168ea99e5300935f6591ad467df4"},
+    {file = "pylint-2.4.4.tar.gz", hash = "sha256:3db5468ad013380e987410a8d6956226963aed94ecb5f9d3a28acca6d9ac36cd"},
 ]
 pyobjc = [
     {file = "pyobjc-6.1-py3-none-any.whl", hash = "sha256:c78056797592fcd351c60604c5a65ad5d259afd908ee1e160364ac7728959e03"},
@@ -2417,7 +2574,33 @@ six = [
     {file = "six-1.14.0-py2.py3-none-any.whl", hash = "sha256:8f3cd2e254d8f793e7f3d6d9df77b92252b52637291d0f0da013c76ea2724b6c"},
     {file = "six-1.14.0.tar.gz", hash = "sha256:236bdbdce46e6e6a3d61a337c0f8b763ca1e8717c03b369e87a7ec7ce1319c0a"},
 ]
+typed-ast = [
+    {file = "typed_ast-1.4.1-cp35-cp35m-manylinux1_i686.whl", hash = "sha256:73d785a950fc82dd2a25897d525d003f6378d1cb23ab305578394694202a58c3"},
+    {file = "typed_ast-1.4.1-cp35-cp35m-manylinux1_x86_64.whl", hash = "sha256:aaee9905aee35ba5905cfb3c62f3e83b3bec7b39413f0a7f19be4e547ea01ebb"},
+    {file = "typed_ast-1.4.1-cp35-cp35m-win32.whl", hash = "sha256:0c2c07682d61a629b68433afb159376e24e5b2fd4641d35424e462169c0a7919"},
+    {file = "typed_ast-1.4.1-cp35-cp35m-win_amd64.whl", hash = "sha256:4083861b0aa07990b619bd7ddc365eb7fa4b817e99cf5f8d9cf21a42780f6e01"},
+    {file = "typed_ast-1.4.1-cp36-cp36m-macosx_10_9_x86_64.whl", hash = "sha256:269151951236b0f9a6f04015a9004084a5ab0d5f19b57de779f908621e7d8b75"},
+    {file = "typed_ast-1.4.1-cp36-cp36m-manylinux1_i686.whl", hash = "sha256:24995c843eb0ad11a4527b026b4dde3da70e1f2d8806c99b7b4a7cf491612652"},
+    {file = "typed_ast-1.4.1-cp36-cp36m-manylinux1_x86_64.whl", hash = "sha256:fe460b922ec15dd205595c9b5b99e2f056fd98ae8f9f56b888e7a17dc2b757e7"},
+    {file = "typed_ast-1.4.1-cp36-cp36m-win32.whl", hash = "sha256:4e3e5da80ccbebfff202a67bf900d081906c358ccc3d5e3c8aea42fdfdfd51c1"},
+    {file = "typed_ast-1.4.1-cp36-cp36m-win_amd64.whl", hash = "sha256:249862707802d40f7f29f6e1aad8d84b5aa9e44552d2cc17384b209f091276aa"},
+    {file = "typed_ast-1.4.1-cp37-cp37m-macosx_10_9_x86_64.whl", hash = "sha256:8ce678dbaf790dbdb3eba24056d5364fb45944f33553dd5869b7580cdbb83614"},
+    {file = "typed_ast-1.4.1-cp37-cp37m-manylinux1_i686.whl", hash = "sha256:c9e348e02e4d2b4a8b2eedb48210430658df6951fa484e59de33ff773fbd4b41"},
+    {file = "typed_ast-1.4.1-cp37-cp37m-manylinux1_x86_64.whl", hash = "sha256:bcd3b13b56ea479b3650b82cabd6b5343a625b0ced5429e4ccad28a8973f301b"},
+    {file = "typed_ast-1.4.1-cp37-cp37m-win32.whl", hash = "sha256:d5d33e9e7af3b34a40dc05f498939f0ebf187f07c385fd58d591c533ad8562fe"},
+    {file = "typed_ast-1.4.1-cp37-cp37m-win_amd64.whl", hash = "sha256:0666aa36131496aed8f7be0410ff974562ab7eeac11ef351def9ea6fa28f6355"},
+    {file = "typed_ast-1.4.1-cp38-cp38-macosx_10_15_x86_64.whl", hash = "sha256:d205b1b46085271b4e15f670058ce182bd1199e56b317bf2ec004b6a44f911f6"},
+    {file = "typed_ast-1.4.1-cp38-cp38-manylinux1_i686.whl", hash = "sha256:6daac9731f172c2a22ade6ed0c00197ee7cc1221aa84cfdf9c31defeb059a907"},
+    {file = "typed_ast-1.4.1-cp38-cp38-manylinux1_x86_64.whl", hash = "sha256:498b0f36cc7054c1fead3d7fc59d2150f4d5c6c56ba7fb150c013fbc683a8d2d"},
+    {file = "typed_ast-1.4.1-cp38-cp38-win32.whl", hash = "sha256:715ff2f2df46121071622063fc7543d9b1fd19ebfc4f5c8895af64a77a8c852c"},
+    {file = "typed_ast-1.4.1-cp38-cp38-win_amd64.whl", hash = "sha256:fc0fea399acb12edbf8a628ba8d2312f583bdbdb3335635db062fa98cf71fca4"},
+    {file = "typed_ast-1.4.1-cp39-cp39-macosx_10_15_x86_64.whl", hash = "sha256:d43943ef777f9a1c42bf4e552ba23ac77a6351de620aa9acf64ad54933ad4d34"},
+    {file = "typed_ast-1.4.1.tar.gz", hash = "sha256:8c8aaad94455178e3187ab22c8b01a3837f8ee50e09cf31f1ba129eb293ec30b"},
+]
+wrapt = [
+    {file = "wrapt-1.11.2.tar.gz", hash = "sha256:565a021fd19419476b9362b05eeaa094178de64f8361e44468f9e9d7843901e1"},
+]
 zipp = [
-    {file = "zipp-2.1.0-py3-none-any.whl", hash = "sha256:ccc94ed0909b58ffe34430ea5451f07bc0c76467d7081619a454bf5c98b89e28"},
-    {file = "zipp-2.1.0.tar.gz", hash = "sha256:feae2f18633c32fc71f2de629bfb3bd3c9325cd4419642b1f1da42ee488d9b98"},
+    {file = "zipp-3.1.0-py3-none-any.whl", hash = "sha256:aa36550ff0c0b7ef7fa639055d797116ee891440eac1a56f378e2d3179e0320b"},
+    {file = "zipp-3.1.0.tar.gz", hash = "sha256:c599e4d75c98f6798c509911d08a22e6c021d074469042177c8c86fb92eefd96"},
 ]
diff --git a/pyproject.toml b/pyproject.toml
index 736e5d5..aa51d9c 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -11,106 +11,11 @@ keywords = ["screen-recorder", "timelapse", "macos"]
 [tool.poetry.dependencies]
 python = "^3.6"
 pyobjc = "6.1"
-pyobjc-core = "6.1"
-pyobjc-framework-Accounts = "6.1"
-pyobjc-framework-AddressBook = "6.1"
-pyobjc-framework-AdSupport = "6.1"
-pyobjc-framework-AppleScriptKit = "6.1"
-pyobjc-framework-AppleScriptObjC = "6.1"
-pyobjc-framework-ApplicationServices = "6.1"
-pyobjc-framework-Automator = "6.1"
-pyobjc-framework-AVFoundation = "6.1"
-pyobjc-framework-AVKit = "6.1"
-pyobjc-framework-BusinessChat = "6.1"
-pyobjc-framework-CalendarStore = "6.1"
-pyobjc-framework-CFNetwork = "6.1"
-pyobjc-framework-CloudKit = "6.1"
-pyobjc-framework-Cocoa = "6.1"
-pyobjc-framework-Collaboration = "6.1"
-pyobjc-framework-ColorSync = "6.1"
-pyobjc-framework-Contacts = "6.1"
-pyobjc-framework-ContactsUI = "6.1"
-pyobjc-framework-CoreAudio = "6.1"
-pyobjc-framework-CoreAudioKit = "6.1"
-pyobjc-framework-CoreBluetooth = "6.1"
-pyobjc-framework-CoreData = "6.1"
-pyobjc-framework-CoreLocation = "6.1"
-pyobjc-framework-CoreMedia = "6.1"
-pyobjc-framework-CoreMediaIO = "6.1"
-pyobjc-framework-CoreML = "6.1"
-pyobjc-framework-CoreServices = "6.1"
-pyobjc-framework-CoreSpotlight = "6.1"
-pyobjc-framework-CoreText = "6.1"
-pyobjc-framework-CoreWLAN = "6.1"
-pyobjc-framework-CryptoTokenKit = "6.1"
-pyobjc-framework-DictionaryServices = "6.1"
-pyobjc-framework-DiscRecording = "6.1"
-pyobjc-framework-DiscRecordingUI = "6.1"
-pyobjc-framework-DiskArbitration = "6.1"
-pyobjc-framework-DVDPlayback = "6.1"
-pyobjc-framework-EventKit = "6.1"
-pyobjc-framework-ExceptionHandling = "6.1"
-pyobjc-framework-ExternalAccessory = "6.1"
-pyobjc-framework-FinderSync = "6.1"
-pyobjc-framework-FSEvents = "6.1"
-pyobjc-framework-GameCenter = "6.1"
-pyobjc-framework-GameController = "6.1"
-pyobjc-framework-GameKit = "6.1"
-pyobjc-framework-GameplayKit = "6.1"
-pyobjc-framework-ImageCaptureCore = "6.1"
-pyobjc-framework-IMServicePlugIn = "6.1"
-pyobjc-framework-InputMethodKit = "6.1"
-pyobjc-framework-InstallerPlugins = "6.1"
-pyobjc-framework-InstantMessage = "6.1"
-pyobjc-framework-Intents = "6.1"
-pyobjc-framework-IOSurface = "6.1"
-pyobjc-framework-iTunesLibrary = "6.1"
-pyobjc-framework-LatentSemanticMapping = "6.1"
-pyobjc-framework-LaunchServices = "6.1"
-pyobjc-framework-libdispatch = "6.1"
-pyobjc-framework-LocalAuthentication = "6.1"
-pyobjc-framework-MapKit = "6.1"
-pyobjc-framework-MediaAccessibility = "6.1"
-pyobjc-framework-MediaLibrary = "6.1"
-pyobjc-framework-MediaPlayer = "6.1"
-pyobjc-framework-MediaToolbox = "6.1"
-pyobjc-framework-MetalKit = "6.1"
-pyobjc-framework-ModelIO = "6.1"
-pyobjc-framework-MultipeerConnectivity = "6.1"
-pyobjc-framework-NaturalLanguage = "6.1"
-pyobjc-framework-NetFS = "6.1"
-pyobjc-framework-Network = "6.1"
-pyobjc-framework-NetworkExtension = "6.1"
-pyobjc-framework-NotificationCenter = "6.1"
-pyobjc-framework-OpenDirectory = "6.1"
-pyobjc-framework-OSAKit = "6.1"
-pyobjc-framework-Photos = "6.1"
-pyobjc-framework-PhotosUI = "6.1"
-pyobjc-framework-PreferencePanes = "6.1"
-pyobjc-framework-PubSub = "6.1"
-pyobjc-framework-QTKit = "6.1"
-pyobjc-framework-Quartz = "6.1"
-pyobjc-framework-SafariServices = "6.1"
-pyobjc-framework-SceneKit = "6.1"
-pyobjc-framework-ScreenSaver = "6.1"
-pyobjc-framework-ScriptingBridge = "6.1"
-pyobjc-framework-SearchKit = "6.1"
-pyobjc-framework-Security = "6.1"
-pyobjc-framework-SecurityFoundation = "6.1"
-pyobjc-framework-SecurityInterface = "6.1"
-pyobjc-framework-ServiceManagement = "6.1"
-pyobjc-framework-Social = "6.1"
-pyobjc-framework-SpriteKit = "6.1"
-pyobjc-framework-StoreKit = "6.1"
-pyobjc-framework-SyncServices = "6.1"
-pyobjc-framework-SystemConfiguration = "6.1"
-pyobjc-framework-UserNotifications = "6.1"
-pyobjc-framework-VideoSubscriberAccount = "6.1"
-pyobjc-framework-VideoToolbox = "6.1"
-pyobjc-framework-Vision = "6.1"
-pyobjc-framework-WebKit = "6.1"
 
 [tool.poetry.dev-dependencies]
 pytest = "3.9.3"
 py2app = "^0.20"
-autopep8 = "^1.5"
+pylint = "^2.4.4"
+
+[tool.poetry.scripts]
+run = "timelapse.__main__:main"
\ No newline at end of file
diff --git a/timelapse/__init.py__ b/timelapse/__init.py__
index 82d7ba4..e69de29 100644
--- a/timelapse/__init.py__
+++ b/timelapse/__init.py__
@@ -1 +0,0 @@
-#!/usr/bin/env python -O
diff --git a/timelapse/__main__.py b/timelapse/__main__.py
index dae82dc..97d807d 100644
--- a/timelapse/__main__.py
+++ b/timelapse/__main__.py
@@ -1,18 +1,35 @@
+"""
+The main entrypoint of the application,
+which initializes the recorder and the encoder.
+"""
+
 import os
+import sys
 import time
 import subprocess
 from pathlib import Path
 
+from AppKit import NSObject, NSMenu, NSApplication, NSStatusBar, \
+                   NSMenuItem, NSImage, NSVariableStatusItemLength, objc
 from PyObjCTools import AppHelper
-from AppKit import *
-
-from notify import notify  # Shows notifications/alerts
-from encoder import Encoder, not_found_msg  # Creates timelapse video
-from recorder import Recorder  # Takes screenshots
 from Foundation import NSUserDefaults
 
+from timelapse.encoder import Encoder # Creates timelapse video
+from timelapse.recorder import Recorder # Takes screenshots
+from timelapse.notify import notify # Shows notifications/alerts
+
+NOT_FOUND_MSG = """
+The ffmpeg command was not found;
+ffmpeg is used by this script to make a video file from a set of pngs.
+It is typically not installed by default distros , but it is widely available.
+On macOS, try running `brew install ffmpeg`.
+"""
+
 
 def dark_mode() -> bool:
+    """
+    Check if the user enabled Dark Mode
+    """
     return NSUserDefaults.standardUserDefaults().stringForKey_('AppleInterfaceStyle') == "Dark"
 
 
@@ -20,7 +37,7 @@ def dark_mode() -> bool:
 start_recording: bool = False  # Start recording on launch
 encode: bool = True  # Create video after recording
 screenshot_interval: float = 1.5  # Number of seconds between screenshots
-dir_base = str(Path.home())  # Base directory
+DIR_BASE = str(Path.home())  # Base directory
 dir_app: str = "timelapse"  # Output directory
 dir_pictures: str = "Pictures"  # Place for pictures in filesystem
 dir_movies: str = "Movies"  # Place for movies in filesystem
@@ -56,8 +73,9 @@ def applicationDidFinishLaunching_(self, notification) -> None:
 
         # Set correct output paths
         self.recorder_output_basedir: str = os.path.join(
-            dir_base, dir_pictures, dir_app)
-        self.encoder_output_basedir: str = os.path.join(dir_base, dir_movies)
+            DIR_BASE, dir_pictures, dir_app)
+        self.encoder_output_basedir: str = os.path.join(DIR_BASE, dir_movies)
+        self.image_dir: str = self.create_dir(self.recorder_output_basedir)
 
         # Create a reference to the statusbar (menubar)
         self.statusbar = NSStatusBar.systemStatusBar()
@@ -72,33 +90,33 @@ def applicationDidFinishLaunching_(self, notification) -> None:
         self.statusitem.setMenu_(self.menu)
 
         # Load icons and show them in the statusbar
-        self.loadIcons()
-        self.setStatus()
+        self.load_icons()
+        self.set_status()
 
-    def loadIcons(self) -> None:
+    def load_icons(self) -> None:
         self.icon_recording = NSImage.alloc().initWithContentsOfFile_(
             os.path.join(dir_resources, image_recording))
         self.icon_idle = NSImage.alloc().initWithContentsOfFile_(
             os.path.join(dir_resources, image_idle))
 
-    def setStatus(self) -> None:
+    def set_status(self) -> None:
         """ Sets the image and menu text according to recording status """
         if self.recording:
             self.statusitem.setImage_(self.icon_recording)
-            self.recordButton.setTitle_(text_recorder_running)
+            self.record_button.setTitle_(text_recorder_running)
             self.statusitem.setToolTip_(tooltip_running)
         else:
             self.statusitem.setImage_(self.icon_idle)
-            self.recordButton.setTitle_(text_recorder_idle)
+            self.record_button.setTitle_(text_recorder_idle)
             self.statusitem.setToolTip_(tooltip_idle)
 
     def createMenu(self) -> NSMenu:
         """ Status bar menu """
         menu = NSMenu.alloc().init()
         # Bind record event
-        self.recordButton = NSMenuItem.alloc().initWithTitle_action_keyEquivalent_(
+        self.record_button = NSMenuItem.alloc().initWithTitle_action_keyEquivalent_(
             text_recorder_idle, 'startStopRecording:', '')
-        menu.addItem_(self.recordButton)
+        menu.addItem_(self.record_button)
         # Quit event
         menuitem = NSMenuItem.alloc().initWithTitle_action_keyEquivalent_(
             'Quit', 'terminate:', '')
@@ -114,12 +132,11 @@ def startStopRecording_(self, notification) -> None:
                     self.image_dir, self.encoder_output_basedir)
                 self.encoder.start()
         else:
-            self.image_dir: str = self.create_dir(self.recorder_output_basedir)
             self.recorder = Recorder(self.image_dir, screenshot_interval)
             self.recorder.start()
             notify("Timelapse started", "The recording has started")
         self.recording: bool = not self.recording
-        self.setStatus()
+        self.set_status()
 
     @objc.python_method
     def create_dir(self, base_dir: str) -> str:
@@ -131,9 +148,9 @@ def create_dir(self, base_dir: str) -> str:
         try:
             print(f"Output directory: {output_dir}")
             os.makedirs(output_dir)
-        except OSError as e:
-            notify("Timelapse error", f"Error while creating directory: {e}")
-            exit()
+        except OSError as os_error:
+            notify("Timelapse error", f"Error while creating directory: {os_error}")
+            sys.exit()
         return output_dir
 
     @objc.python_method
@@ -153,11 +170,15 @@ def check_dependencies(self) -> None:
             # This is a quick and dirty check; it leaves some spurious output
             # for the user to puzzle over.
         except OSError:
-            print(not_found_msg)
+            print(NOT_FOUND_MSG)
+            notify("Timelapse", "ERROR: ffmpeg not found")
+            sys.exit()
 
-
-if __name__ == "__main__":
+def main():
     app = NSApplication.sharedApplication()
     delegate = Timelapse.alloc().init()
     app.setDelegate_(delegate)
     AppHelper.runEventLoop()
+
+if __name__ == "__main__":
+    main()
diff --git a/timelapse/encoder.py b/timelapse/encoder.py
index 020f3dc..2b3a304 100644
--- a/timelapse/encoder.py
+++ b/timelapse/encoder.py
@@ -1,19 +1,12 @@
+"""
+Deals with encoding the screenshots to video using ffmpeg.
+"""
+
 from threading import Thread  # Encoder is a thread
 import subprocess
 from datetime import datetime
-import os
-import glob
-import fnmatch
-import shutil
-from notify import notify  # Shows notifications/alerts
 from typing import List
-
-not_found_msg = """
-The ffmpeg command was not found;
-ffmpeg is used by this script to make a video file from a set of pngs.
-It is typically not installed by default distros , but it is widely available.
-On macOS, try running `brew install ffmpeg`.
-"""
+from timelapse.notify import notify  # Shows notifications/alerts
 
 
 class Encoder(Thread):
@@ -48,16 +41,11 @@ def run(self) -> None:
                               "-vf", "format=yuv420p",
                               "-vcodec", "h264",
                               self.output]
+        notify("Timelapse", f"Creating timelapse. This might take a while")
+        print(' '.join(command))
         try:
-            notify("Timelapse", f"Creating timelapse. This might take a while")
-            print(' '.join(command))
-            try:
-                completed = subprocess.run(
-                    command, capture_output=True, check=True)
-            except subprocess.CalledProcessError as e:
-                notify("Timelapse: ffmpeg not found.", e.stderr.decode('utf-8'))
-            else:
-                notify("Timelapse", f"Movie saved to `{self.output}`")
-        except Exception as e:
-            print("Main exception", e)
-            notify("Timelapse Error", e)
+            subprocess.run(command, capture_output=True, check=True)
+        except subprocess.CalledProcessError as ffmpeg_error:
+            notify("Timelapse: ffmpeg not found.", ffmpeg_error.stderr.decode('utf-8'))
+        else:
+            notify("Timelapse", f"Movie saved to `{self.output}`")
diff --git a/timelapse/notify.py b/timelapse/notify.py
index ebf1446..565444b 100644
--- a/timelapse/notify.py
+++ b/timelapse/notify.py
@@ -1,6 +1,13 @@
-from subprocess import run
+"""
+Functionality to show notifications on macOS
+"""
+
+import subprocess
 
 
 def notify(title: str, text: str) -> int:
+    """
+    Show a macOS notification using osascript
+    """
     script = 'display notification "{}" with title "{}"'.format(text, title)
-    return run(['osascript', '-e', script]).returncode
+    return subprocess.run(['osascript', '-e', script], check=True).returncode
diff --git a/timelapse/recorder.py b/timelapse/recorder.py
index ce221ef..02e5239 100644
--- a/timelapse/recorder.py
+++ b/timelapse/recorder.py
@@ -1,26 +1,32 @@
+"""
+Recorder is responsible for taking regular (1 second) screenshots of the
+screen where the mouse is located.
+"""
+
 import os
 import subprocess  # Taking screenshot
-import datetime  # Filename
 from multiprocessing import Process, Event
-from PyObjCTools import AppHelper
 from AppKit import NSEvent, NSScreen, NSMouseInRect
 
-
 def get_screen_with_mouse_index() ->int:
-    mouseLocation = NSEvent.mouseLocation()
+    """
+    Get the ID for the screen where the mouse is currently on.
+    """
+    mouse_location = NSEvent.mouseLocation()
     screens = NSScreen.screens()
     for i, screen in enumerate(screens):
-        if NSMouseInRect(mouseLocation, screen.frame(), False):
+        if NSMouseInRect(mouse_location, screen.frame(), False):
             return i
     return 0
 
 
 class Recorder(Process):
     """
-    Takes a screenshot every 'interval' seconds and saves it into output_dir or a subdirectory thereof.
+    Takes a screenshot every 'interval' seconds and saves it into output_dir or
+    a subdirectory thereof.
     """
 
-    def __init__(self, output_dir: str, interval: int=4) -> None:
+    def __init__(self, output_dir: str, interval: int = 4) -> None:
         # Initialize the thread
         Process.__init__(self)
 
@@ -54,6 +60,7 @@ def run(self) -> None:
         self._stopped.set()
 
     def get_recording_time(self) ->str:
+        """ Get the total recording time as a human-readable string """
         return str(self.screenshot_counter * self.interval) + " seconds"
 
     def get_filename(self) ->str:
@@ -67,6 +74,6 @@ def screenshot(self) -> None:
         filename: str = self.get_filename()
         subprocess.run(
             ['screencapture', '-S', '-o', '-x', '-D',
-                str(get_screen_with_mouse_index() + 1), '-t', self.format, filename],
+             str(get_screen_with_mouse_index() + 1), '-t', self.format, filename],
             check=True)
         self.screenshot_counter += 1