#!/usr/bin/env -S execlineb -WS4
# SPDX-License-Identifier: EUPL-1.2+
# SPDX-FileCopyrightText: 2025 Demi Marie Obenour <demiobenour@gmail.com>
# $1: awk script name
# $2: transfer directory
# $3: target directory
# $4: update URL
export LC_ALL C
export LANGUAGE C
backtick -N sed_rhs {
  # Use awk to both validate the URL and to escape sed metacharacters.
  awk -f $1 -- $4
}
export tmpdir $3
elglob -w -0 transfer_file_ ${2}/*.transfer
forx -E transfer_file { $transfer_file_ }
backtick target_basename {
  basename -- $transfer_file
}
multisubstitute {
  importas -iuS sed_rhs
  importas -iuS target_basename
  importas -iuS tmpdir
  define source $transfer_file
}
redirfd -w 1 ${tmpdir}/${target_basename} sed -E -- "s#@UPDATE_URL@#${sed_rhs}#g" $source