Simply source a gpg-encrypted shell script

gpg-source.sh

#!/bin/bash

# Since the exported env vars would only exist in this script,
# you will have to source this file and then call the function.

function gpg-source {
  # if $1 is set, source the corresponding file
  if [ -n "$1" ]
  then
    if [ -f "$1" ]
    then
      source  <(gpg --decrypt $1 2> /dev/null)
    else
      echo "File does not exist."
    fi
  else
    echo "No file given to source."
  fi
}