Add error_message function

qb

@@ -69,6 +69,17 @@ debug_message() {                                               # {{{
 	return 0
 }
 # }}}
+error_message() {                                               # {{{
+
+	local_error_message="${1}"
+	local_error_code="${2}"
+
+	## Print message if DEBUG is enable (=0)
+	[ "${DEBUG}" -eq "0" ] && printf '%b\n' "ERROR − ${PROGNAME} : ${RED}${local_error_message}${RESET}"
+
+	exit "${local_error_code:=66}"
+}
+# }}}
 is_proc_running() {                                             # {{{
 
 	local_proc_pattern="${1}"
@@ -212,12 +223,9 @@ main() {                                                        # {{{
 	define_vars
 
 	## Try to get a working qutebrowser binary
-	### Or exit with error
+	### Or exit with error message and code 1
 	get_qutebrowser_bin \
-		|| debug_message "main − \
-Can't find a working qutebrowser binary." \
-		|| exit 2
-
+		|| error_message "Can't find a working qutebrowser binary." "1"
 
 		## If nothing related to Qutebrowser is currently running
 		### Try to start qutebrowser