Code as a script but with re-entrant/debug access to functions

can_debug.bash

#!/usr/bin/env bash

# usages:
#   As a script:
#     $ ./can_debug.bash
#     > you are Rasheed Abdul-Aziz
#   As a library of functions:
#     $ source can_debug.bash
#     $ say_my_name
#     > usage: say_my_name <your-name-here>
#     $ say_my_name "Ted Lasso"
#     > you are Ted Lasso


main() {
  [[ ! -z $DEBUG ]] && set -x
  say_my_name "Rasheed Abdul-Aziz"
}

say_my_name() {
  name="$1"

  if [[ -z $name ]]; then
    echo "usage: say_my_name <your-name-here>"
    return 1
  fi

  echo "you are $name"

}

[[ "${BASH_SOURCE[0]}" == "${0}" ]] && main