#!/bin/bash -e

. /usr/bin/libremessages

cachedir="$(pbs-plumb-config get core.cachedir)"
sourcedir="$(pbs-plumb-config get core.sourcedir)"
tmpdir="`mktemp -d --tmpdir pbs-absrepo-convert.XXXXXXXXXX`"
export TMPDIR=$tmpdir

cleanup() {
	rm -rf "$tmpdir"
}

trap cleanup EXIT

main() {
	[[ $# != 1 ]] && { usage; return 1; }
	local source=$1

	# init #################################################################
	cd "${cachedir}/${source}.git"
	git branch > "${tmpdir}/branches"
	git clone "${cachedir}/${source}.git" "${tmpdir}/repo"

	cd "${tmpdir}/repo"
	git checkout -b orig
	git branch -D master
	find */repos/* -type d -printf '%f\n' | sed -e 's/.*/-//' -e '/^any$/d' | sort -u > "${tmpdir}/architectures"

	# convert packages #####################################################
	msg "$(gettext "Converting packages...")"
	package_count="$(wc -l "${tmpdir}/branches")"
	package_count="${package_count%% *}"
	cat "${tmpdir}/branches" | sed -n 's@^\s*packages/@@p' | cat -n | while read n package; do
		msg2 "$(gettext "(%d/%d) %s")" "$n" "$package_count" "$package"
		git checkout "packages/${package}"
		git filter-branch -f --prune-empty --subdirectory-filter trunk "packages/${package}"
		git log --pretty=format:'%T %H' > "${tmpdir}/packages-${package}.commits"
	done

	# convert architectures ################################################
	for arch in master $(cat "${tmpdir}/architectures"); do
		msg "$(gettext "Creating architecture %s...")" "$arch"
		git checkout orig
		git checkout -b "$arch"
		git filter-branch --tree-filter "pbs-absrepo-convert--treefilter $arch" "$arch"
	done

	# save results #########################################################
	msg "$(gettext "Copying into source directory...")"
	[[ -d "$sourcedir" ]] || mkdir -p "$sourcedir"
	git clone --mirror "${tmpdir}/repo" "${sourcedir}/${source}.new.git"
	[[ -d "${sourcedir}/${source}.git" ]] && mv "${sourcedir}/${source}"{,.old}.git
	mv "${sourcedir}/${source}"{.new,}.git
	[[ -d "${sourcedir}/${source}.old.git" ]] && rm -rf "${sourcedir}/${source}".old.git
}

main "$@"