Add debug function

ecran

@@ -3,9 +3,32 @@
 # Description:      Manage video output (size, orientation, ...)
 #                   And reload wm configuration
 
-# First and main screen (laptop screen,…)
+# Vars {{{
-MAIN_SCREEN="LVDS-1"
+## First and main screen (laptop screen,…)
+readonly MAIN_SCREEN="LVDS-1"
 
+[ -z "${DEBUG}" ] && readonly DEBUG=0
+
+## Colors
+readonly PURPLE='\033[1;35m'
+readonly RED='\033[0;31m'
+readonly RESET='\033[0m'
+readonly COLOR_DEBUG="${PURPLE}"
+# }}}
+
+# Functions {{{
+debug_message() {                                               # {{{
+
+	local_message="${1}"
+
+	## Print message if DEBUG is enable (=0)
+	[ "${DEBUG}" -eq "0" ] && printf '\e[1;35m%-6b\e[m\n' "DEBUG − ${PROGNAME}: ${local_message}"
+
+	return 0
+}
+# }}}
+
+# }}}
 
 case "${1}" in
 	ds | dockstation | work )