bash script, prompt user to select ID or name completion - bash

Question

I am working on a script that reads the directories in a path and prompts the user for witch directory to choose. The script so far looks like this:
select choises in ${list_files[#]}; do
if CONTAINS_ELEMENT $choises "${list_files[#]}"; then
break
else
echo "invalid choise (PS use the ID numbers)! Try again:"
fi
done
the "CONTAINS_ELEMENT" thingy is a function that checks if the variable $choises is a member of the list_files array. This script works fine, and the output is something like this:
1) first_folder
2) second_folder
3) yet_another_folder
And the user can choose witch folder by typing in the corresponding ID value (ie "2" for "second_folder").
What I am struggling with is this: Is there a way to check if the supplied answer is a correct number -or- a correct file name? And if you can write in the file name manually, is there a way to implement name completion in this script?
The actual reply to select is held in the variable $REPLY, I need to somehow check both $choises and $REPLY. The completion mechanism is much more tricky I suspect..
Does anyone have a good suggestion here? It would be very cool if you could help me get in these features!!

Answer 1

select choises in ${list_files[#]}; do
if CONTAINS_ELEMENT $choises "${list_files[#]}" || CONTAINS_ELEMENT $REPLY "${list_files[#]}"; then
break
else
echo "invalid choise (PS use the ID numbers)! Try again:"
fi
done
This makes both the ID number and the full directory name work, the code is a bit ugly though, and there is no name completion.