config/show_config: allow direct execution

FUNCNAME[0] is a bash builtin that corresponds to the name of the currently executing
function. Functions called in bare scripts are in the main() function. Bare scripts
being sourced are in the source() function.

Signed-off-by: Ian Leonard <antonlacon@gmail.com>

config/show_config

@@ -1,3 +1,5 @@
+#!/bin/bash
+
 show_config() {
   # load graphic configuration
   get_graphicdrivers
@@ -115,3 +117,9 @@ show_config() {
 
   echo -e "$config_message"
 }
+
+
+if [ "${FUNCNAME[0]}" = "main" ]; then
+  . config/options ""
+  show_config
+fi