#!/bin/sh

set -eu

PLAT=

main()
{
	PLAT="$(sed '1{s/^config-\([^ ][^ ]*\) (.*$/\1/;};1!q;' changelog)"

	make_common_pkg
	make_base_pkg
	make_build_time_pkgs
	make_run_time_pkgs
}

info()
{
	local fmt="${1}"
	shift 1

	printf "ppt-mkpkgs: ${fmt}\n" "${@}"
}

make_common_pkg()
{
	# Make "-common" package to provide source package documentation files.
	mkdir -p "config-${PLAT}-common.pkg"
	cat >"config-${PLAT}-common.pkg/control" <<-EOF
		Architecture: all
		Platform: all
		Description: "${PLAT}" platform configuration - common files
		EOF
	>"config-${PLAT}-common.pkg/docs"
	info 'Metadata for package "%s" generated.' "config-${PLAT}-common"
}

make_base_pkg()
{
	# Make a "config-base" package to depend on packages to be automatically
	# installed.
	mkdir -p "config-base.pkg"
	cat >"config-base.pkg/control" <<-EOF
		Architecture: all
		Platform: ${PLAT}
		Essential: yes
		Depends: config-${PLAT}-common (= \${Binary-Version}),
		 \${Config-Base-Depends}
		Description: "${PLAT}" platform configuration - base package
		EOF
	info 'Metadata for package "%s" generated.' "config-base"
}

make_build_time_pkgs()
{
	local pkg=

	# Make each config-*-* package.
	for pkg in src/build/*; do
		[ -d "${pkg}" ] || continue
		pkg="${pkg#src/build/}"
		mkdir -p "config-${pkg}-${PLAT}.pkg"
		cat >"config-${pkg}-${PLAT}.pkg/control" <<-EOF
			Architecture: all
			Platform: all
			Depends: config-${PLAT}-common (= \${Binary-Version})
			Description: "${PLAT}" platform configuration for ${pkg}
			EOF
		info 'Metadata for package "%s" generated.' \
			"config-${pkg}-${PLAT}"
	done
}

make_run_time_pkgs()
{
	local pkg=

	# Make each config-* package.
	for pkg in src/run/*; do
		[ -d "${pkg}" ] || continue
		pkg="${pkg#src/run/}"
		mkdir -p "config-${pkg}.pkg"
		cat >"config-${pkg}.pkg/control" <<-EOF
			Architecture: all
			Platform: ${PLAT}
			Depends: config-${PLAT}-common (= \${Binary-Version})
			Description: "${PLAT}" platform configuration for ${pkg}
			EOF
		info 'Metadata for package "%s" generated.' \
			"config-${pkg}"
	done
}

main "${@}"