diff --git a/modules/01-system-settings.sh b/modules/01-system-settings.sh
index 7750e41..d597826 100755
--- a/modules/01-system-settings.sh
+++ b/modules/01-system-settings.sh
@@ -92,10 +92,21 @@ function configureLoginWindow() {
   lop success 'done'
 }
 
-function main() {
-  autoloadZShLib || return
-  checkPrerequisites || return
-  eval "`docopts -f -V - -h - : "$@" <<- USAGE
+function configure_system() {
+  quitSystemPreferences
+  configureComputerHostname
+  configureBasicSystem
+  configurePowerManagement
+  configureLoginWindow
+
+  lop info 'Configuring global umask'
+  launchctl config user umask 027
+}
+
+if [[ "${ZSH_EVAL_CONTEXT}" == toplevel ]]; then
+  test -f "${ASTZWEIG_MACOS_SYSTEM_LIB}" || { echo 'This module requires macos-system library. Please run again with macos-system library provieded as a path in ASTZWEIG_MACOS_SYSTEM_LIB env variable.'; return 10 }
+  source "${ASTZWEIG_MACOS_SYSTEM_LIB}"
+  module_main "$@" <<- USAGE
 	Usage:
 	  $0 show-questions
 	  $0 [-v] [-d FILE] --hostname NAME --timezone ZONE
@@ -111,23 +122,5 @@ function main() {
 	$0 0.1.0
 	Copyright (C) 2022 Rezart Qelibari, Astzweig GmbH & Co. KG
 	License EUPL-1.2. There is NO WARRANTY, to the extent permitted by law.
-	USAGE`"
-  [ $# -eq 0 ] && return
-  configureLogging
-  [ "${show_questions}" = true ] && { showQuestions; return }
-  
-  quitSystemPreferences
-  configureComputerHostname
-  configureBasicSystem
-  configurePowerManagement
-  configureLoginWindow
-  
-  lop info 'Configuring global umask'
-  launchctl config user umask 027
-}
-
-if [[ "${ZSH_EVAL_CONTEXT}" == toplevel ]]; then
-  test -f "${ASTZWEIG_MACOS_SYSTEM_LIB}" || { echo 'This module requires macos-system library. Please run again with macos-system library provieded as a path in ASTZWEIG_MACOS_SYSTEM_LIB env variable.'; return 10 }
-  source "${ASTZWEIG_MACOS_SYSTEM_LIB}"
-  main "$@"
+	USAGE
 fi
diff --git a/modules/lib.sh b/modules/lib.sh
index c521b8f..1afb518 100644
--- a/modules/lib.sh
+++ b/modules/lib.sh
@@ -25,3 +25,13 @@ function checkCommands() {
     fi
   done
 }
+
+function module_main() {
+  autoloadZShLib || return
+  checkPrerequisites || return
+  eval "`docopts -f -V - -h - : "$@"`"
+  [ $# -le 1 ] && return
+  configureLogging
+  [ "${show_questions}" = true ] && { showQuestions; return }
+  configure_system
+}