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#! /bin/sh
#
# opkhelper
# src/oh-gencontrol
# Generates a control directory with a control file and scripts.
#
# Copyright (C) 2012 Patrick "P. J." McDermott
#
# This program 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.
#
# This program 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 this program.  If not, see <http://www.gnu.org/licenses/>.

. @@LIBDIR@@/opkhelper/controlfields

print_usage()
{
	printf 'Usage: %s -s | pkgname...\n' "$1"
}

missing_field()
{
	printf 'oh-gencontrol: ERROR: Missing field "%s" in control file.\n' \
		"${1}" >&2
	exit 2
}

invalid_pkg_name()
{
	printf 'oh-gencontrol: Error: Invalid package name: "%s"\n' "${1}" >&2
	exit 2
}

copy_required_field()
{
	if [ ${#} -eq 2 ]; then
		{ printf '%s: ' "${1}" && oh_get_field "${1}";} >> "${2}"
		[ ${?} -eq 1 ] && missing_field "${1}"
	else
		{ printf '%s: ' "${2}" && oh_get_field "${1}" "${2}";} >> "${3}"
		[ ${?} -eq 1 ] && missing_field "${2}"
	fi
}

copy_optional_field()
{
	if [ ${#} -eq 2 ]; then
		field=$(printf '%s: ' "${1}" && oh_get_field "${1}")
		[ ${?} -eq 0 ] && printf '%s\n' "${field}" >> "${2}"
	else
		field=$(printf '%s: ' "${2}" && oh_get_field "${1}" "${2}")
		[ ${?} -eq 0 ] && printf '%s\n' "${field}" >> "${3}"
	fi
}

gen_control_src()
{
	srcpkg=$(oh_get_field Source) || missing_field Source
	oh_validate_pkg_name "${srcpkg}" || invalid_pkg_name "${srcpkg}"

	printf 'oh-gencontrol: Generating control directory for package "%s"...\n' \
		"${srcpkg}-src"

	control_dir="${srcpkg}-src.control"
	control="${control_dir}/control"

	mkdir "${control_dir}"

	printf 'Package: %s\n' "${srcpkg}-src" > ${control}
	printf 'Source: %s\n' "${srcpkg}" >> ${control}
	copy_required_field Version ${control}
	printf 'Architecture: all\n' >> ${control}
	# TODO: Calculate "Installed-Size".
	copy_required_field Maintainer ${control}
	copy_optional_field Homepage ${control}
}

gen_control_bin()
{
	binpkg="${1}"
	oh_validate_pkg_name "${binpkg}" || invalid_pkg_name "${binpkg}"

	printf 'oh-gencontrol: Generating control directory for package "%s"...\n' \
		"${binpkg}"

	control_dir="${binpkg}.control"
	control="${control_dir}/control"

	mkdir "${control_dir}"

	# Binary and source package names and version.
	copy_required_field ${binpkg} Package ${control}
	copy_required_field Source ${control}
	copy_required_field Version ${control}

	# TODO: Handle architecture.
	{ printf 'Architecture: ' && oh_get_field ${binpkg} Architecture;} \
		>> ${control}
	[ ${?} -eq 1 ] && missing_field Architecture

	# Optional fields.
	copy_optional_field ${binpkg} Essential ${control}
	copy_optional_field ${binpkg} Depends ${control}
	copy_optional_field ${binpkg} Recommends ${control}
	copy_optional_field ${binpkg} Suggests ${control}
	copy_optional_field ${binpkg} Pre-Depends ${control}
	copy_optional_field ${binpkg} Conflicts ${control}
	copy_optional_field ${binpkg} Provides ${control}
	copy_optional_field ${binpkg} Replaces ${control}

	# TODO: Calculate "Installed-Size".
	copy_required_field Maintainer ${control}
	copy_required_field ${binpkg} Description ${control}
	copy_optional_field Homepage ${control}

	for script in preinst postinst prerm postrm; do
		if [ -f ../${binpkg}.pkg/${script} ]; then
			cp ../${binpkg}.pkg/${script} ${control_dir}
			# TODO: Set mode?
			# TODO: Handle links?
		fi
	done
}

if [ ${#} -eq 0 ]; then
	print_usage ${0} >&2
	exit 1
fi

is_src=false
opts=$(getopt -n "${0}" -o 's' -- "${@}")
if [ ${?} -ne 0 ]; then
	print_usage "${0}" >&2
	exit 1;
fi
eval set -- "${opts}"
while true; do
	case "${1}" in
		-s)
			is_src=true
			shift
			;;
		--)
			shift
			break
			;;
		*)
			print_usage "${0}" >&2
			exit 1
			;;
	esac
done

if ${is_src}; then
	gen_control_src
else
	if [ ${#} -eq 0 ]; then
		print_usage "${0}" >&2
		exit 1
	fi

	while [ ${#} -gt 0 ]; do
		gen_control_bin "${1}"
		shift
	done
fi