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# Functions for handling feed index files
#
# Copyright (C) 2013, 2014  Patrick "P. J." McDermott
#
# This file is part of the ProteanOS Development Kit.
#
# The ProteanOS Development Kit is free software: you can redistribute
# it and/or modify it under the terms of the GNU General Public License
# as published by the Free Software Foundation, either version 3 of the
# License, or (at your option) any later version.
#
# The ProteanOS Development Kit is distributed in the hope that it
# will be useful, but WITHOUT ANY WARRANTY; without even the implied
# warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
# See the GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with the ProteanOS Development Kit.  If not, see
# <http://www.gnu.org/licenses/>.

feed_dep_fields=
feed_pkg_cb=
feed_deps_cb=
feed_fname_cb=
feed_md5sum_cb=
feed_sha256sum_cb=
feed_pkgs=
feed_pkg_include=
feed_pkg=
feed_deps=

feed_download()
{
	local base_url="${1}"
	local list_file="${2}"
	local use_gzip="${3}"
	local url=
	local gunzip=

	if ${use_gzip}; then
		url="${base_url}/Packages.gz"
	else
		url="${base_url}/Packages"
	fi

	case "${list_file}" in
		*.gz) gunzip="${GUNZIP}";;
		*)    gunzip='cat';;
	esac
	${WGET} -q -O - "${url}" | ${gunzip} >"${list_file}"

	return 0
}

feed_find_pkgs()
{
	local feed_idx="${1}"
	local dep_fields="${2}"
	local pkg_cb="${3}"
	local deps_cb="${4}"
	local fname_cb="${5}"
	local md5sum_cb="${6}"
	local sha256sum_cb="${7}"

	feed_dep_fields=" $(printf '%s ' ${dep_fields} | tr 'A-Z' 'a-z')"
	feed_pkg_cb="${pkg_cb}"
	feed_deps_cb="${deps_cb}"
	feed_fname_cb="${fname_cb}"
	feed_md5sum_cb="${md5sum_cb}"
	feed_sha256sum_cb="${sha256sum_cb}"

	feed_pkgs=''
	feed_pkg_include='false'
	feed_pkg=''
	feed_deps=''

	{ ${GUNZIP} -c -- "${feed_idx}" || cat "${feed_idx}"; } 2>/dev/null | \
		parse_control '-' feed_field_cb feed_para_cb 'Package'

	printf '%s\n' "${feed_pkgs# }"

	return 0
}

feed_field_cb()
{
	local name="${1}"
	local value="${2}"

	name="$(printf '%s\n' "${name}" | tr 'A-Z' 'a-z')"

	if [ "x${name}" = 'xpackage' ]; then
		feed_pkg="${value}"
	elif [ "x${name}" = 'xfilename' ]; then
		${feed_fname_cb} "${feed_pkg}" "${value}"
	elif [ "x${name}" = 'xmd5sum' ]; then
		${feed_md5sum_cb} "${feed_pkg}" "${value}"
	elif [ "x${name}" = 'xsha256sum' ]; then
		${feed_sha256sum_cb} "${feed_pkg}" "${value}"
	elif [ "x${feed_dep_fields#* ${name} }" != "x${feed_dep_fields}" ]; then
		feed_deps="${feed_deps}${value}, "
	fi

	if ${feed_pkg_cb} ${name} ${value}; then
		feed_pkg_include='true'
	fi

	return 0
}

feed_para_cb()
{
	local new_deps=
	local dep=

	if ${feed_pkg_include}; then
		feed_pkgs="${feed_pkgs} ${feed_pkg}"
	fi

	new_deps=''
	IFS=','
	for dep in ${feed_deps%, }; do
		unset IFS
		# Trim off versions and disjunctions.
		dep="${dep%%(*}"
		dep="${dep%%|*}"
		# Trim whitespace.
		dep="$(printf '%s\n' "${dep}" | sed 's/^ *//; s/ *$//')"
		# In practice, this would suffice for control files generated by
		# opkbuild:
		#     dep="${dep#[ ${HT}${LF}]}"
		#     dep="${dep%[ ${HT}${LF}]}"
		new_deps="${new_deps} ${dep}"
	done
	unset IFS

	${feed_deps_cb} "${feed_pkg}" "${new_deps# }"

	feed_pkg_include='false'
	feed_pkg=''
	feed_deps=''

	return 0
}