get-env

# Work out which environment the deploy and container scripts should act on.
#
# Sourced rather than run, because it exists to set variables for its caller:
#
#   ENV          the environment's name, empty for the default one
#   DOTENV_FILE  absolute path of the env file to use, empty if there is none
#   REST_ARGS    whatever arguments were left once --env had been taken out
#
# It only *finds* the file, and never reads it. Callers that need the values inside do that
# themselves: scripts/connect sources it, scripts/container passes the path to
# `docker compose --env-file`, and scripts/deploy copies it to the server.
#
# The environment is given as -e/--env/--env=, where "-" stands for the current branch name, and
# selects dist/<ENV>.env, or dist/.env when no environment is named. A worktree keeps no deploy
# env files of its own, so the main checkout's are used instead.

set -e

cd "$(dirname "$0")/.."

. scripts/lib

REST_ARGS=()

while (($#)); do
  case $1 in
    -e|--env)
      ENV="$2"
      shift 2 # past argument and value
      ;;
    -e*)
      ENV="${1#-e}"
      shift
      ;;
    --env=*)
      ENV="${1#*=}"
      shift
      ;;
    --)
      shift
      REST_ARGS+=("$@")
      break
      ;;
    *)
      REST_ARGS+=("$1")
      shift
      ;;
  esac
done

set -a
if [ "$ENV" = "-" ]; then
  ENV="$(git branch --show-current)"
  if [ -z "$ENV" ]; then
    printf 'Git currently has a detached HEAD, cannot deploy the branch.\n' >&2
    echo >&2
    exit 1
  fi
fi

if [ -f dist/"$ENV".env ]; then
  DOTENV_FILE="$(readlink -f dist/"$ENV".env)"
elif [ -f "$(primary_root)"/dist/"$ENV".env ]; then
  # A worktree has no deploy env files of its own, since they are gitignored. Borrow the main
  # checkout's rather than keeping a second copy of the deploy secrets in step with the first.
  DOTENV_FILE="$(readlink -f "$(primary_root)"/dist/"$ENV".env)"
elif [ ! -z "$ENV" ]; then
  printf 'The environment %q is not supported, the file dist/%q.env does not exist.\n' \
    "$ENV" "$ENV" >&2
  echo >&2
  exit 1
fi
set +a