#!/bin/bash 
__cbt()
{
  local cur prev opts
  COMPREPLY=()
  cur="${COMP_WORDS[COMP_CWORD]}"
  prev="${COMP_WORDS[COMP_CWORD-1]}"
  opts="$(cbt taskNames)"
  COMPREPLY=( $(compgen -W "${opts}" -- ${cur}) )
  return 0
}

complete -F __cbt cbt