#!/usr/bin/env bash

TMP_FILE=/tmp/docker-compose.$$.yaml

finish() {
  rm ${TMP_FILE} ${TMP_FILE}.tmp 2>/dev/null
}

trap finish EXIT

compose-config() {
  mv -f ${TMP_FILE} ${TMP_FILE}.tmp
  docker-compose -f ${1} -f ${TMP_FILE}.tmp config >${TMP_FILE}

  rm -f ${TMP_FILE}.tmp 2>/dev/null
}

args=()
files=()

while [ -n "$1" ]; do 
  case "$1" in
    -f)
      shift; files+=($1)
      ;;
    *)
      args+=($1)
      ;;
  esac
  shift
done

echo 'version: "3"' >${TMP_FILE}

for f in ${files[@]}; do
  compose-config ${f}
done

docker-compose -f ${TMP_FILE} ${args[@]}
exit $?