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#!/usr/bin/env bash

# Copyright 2020 Gentoo Authors

# Distributed under the terms of the GNU General Public License v3 (or any later version)

set -euo pipefail

while getopts :d OPT; do

	case $OPT in

		d)

			set -x

			;;

		*)

			echo "usage: ${0##*/} [-d]"

			exit 2

	esac

done

readonly GENTOO_PROFILE_ENV_PATH="/etc/profile.env"

readonly GENTOO_SYSTEMD_ENV_CONF="/usr/lib/environment.d/gentoo-env.conf"

# Strip "export " to transform gentoo's profile.env syntax, which is

# shell, to systemd's environment.d syntax (which is shell-like

# without explicit "export" keyword).

readonly STRIP_EXPORT_REGEX="s;^export ;;"

# Strip comments.

readonly STRIP_COMMENTS_REGEX="/^[ \t]*#/d"

# Strip emtpy lines.

readonly STRIP_EMPTY_LINES_REGEX="/^[ \t]*$/d"

sed -e "${STRIP_EXPORT_REGEX}" \

	-e "${STRIP_COMMENTS_REGEX}" \

	-e "${STRIP_EMPTY_LINES_REGEX}" \

	"${GENTOO_PROFILE_ENV_PATH}" \

	> "${GENTOO_SYSTEMD_ENV_CONF}"