#! /bin/sh
# $NetBSD: prepare-import.sh,v 1.8 2026/06/19 07:49:00 kre Exp $
#
# Use this script to recreate the 'dist' subdirectory from a newly released
# distfile.  The script takes care of unpacking the distfile, removing any
# files that are not relevant to NetBSD and checking if there are any new
# files in the new release that need to be addressed.
#
# See the README file for general instructions.
#

set -e

ProgName=${0##*/}

err() {
	IFS=' '
	printf '%s: %s\n' "${ProgName}" "${*}" 1>&2
	exit 1
}

log() {
	IFS=' '
	printf '%s: %s\n' "${ProgName}" "${*}"
	unset IFS
}

backup_dist() {
	if [ -d dist.old ]; then
		log 'Removing dist; dist.old exists'
		rm -rf dist
	else
		log 'Backing up dist as dist.old'
		mv dist dist.old
	fi
}

extract_distfile() {
	local distfile="${1}"; shift
	local distname="${1}"; shift

	log "Extracting ${distfile}"
	tar -xzf "${distfile}"
	[ -d "${distname}" ] || err "Distfile did not create '${distname}'"
	log "Renaming '${distname}' to dist"
	mv "${distname}" dist
}

get_distname() {
	local distfile="${1}"; shift
	basename "${distfile%.tar.*}"
}

cleanup_dist() {
	log "Removing unnecessary files from dist"

	find dist -name .deps -exec rm -fr {} +
	find dist -name .dirstamp -exec rm -f {} +

	# If any of these are no longer in the distfile
	# the script will abort (-e ...) - remove the
	# line that is no longer needed.

	rm dist/cmd-parse.c

	rm dist/compat/asprintf.c
	rm dist/compat/bitstring.h
	rm dist/compat/closefrom.c
	rm dist/compat/daemon.c
	rm dist/compat/fgetln.c
	rm dist/compat/forkpty-aix.c
	rm dist/compat/forkpty-hpux.c
	rm dist/compat/forkpty-sunos.c
	rm dist/compat/getopt_long.c
	rm dist/compat/queue.h
	rm dist/compat/setenv.c
	rm dist/compat/strcasestr.c
	rm dist/compat/strlcat.c
	rm dist/compat/strlcpy.c
	rm dist/compat/strsep.c
	rm dist/compat/strtonum.c
	rm dist/compat/tree.h
	rm dist/compat/unvis.c
	rm dist/compat/vis.c
	rm dist/compat/vis.h
}

diff_dirs() {
	local old_dir="${1}"; shift
	local new_dir="${1}"; shift

	local old_list new_list diff

	old_list=$(mktemp -t tmux-import-o.XXXXXX)
	new_list=$(mktemp -t tmux-import-n.XXXXXX)
	diff=$(    mktemp -t tmux-import-d.XXXXXX)

	trap "rm -f '${old_list}' '${new_list}' '${diff}'; exit 1" \
	    HUP INT QUIT TERM

	( cd "${old_dir}" && find . | sort >"${old_list}" )
	( cd "${new_dir}" && find . | sort >"${new_list}" )

	diff -u "${old_list}" "${new_list}" | grep '^+\.' >>"${diff}" || :
	if [ -s "${diff}" ]; then
		log 'New files found'
		diff -u "${old_list}" "${new_list}" | grep '^+\.'
		log 'Check if any files have to be cleaned up and update' \
		    'the prepare-import.sh script accordingly'
	else
		log 'No new files; all good!'
	fi

	# Should something be testing for removed files ?

	rm -f "${old_list}" "${new_list}" "${diff}"
	trap - HUP INT QUIT TERM
}

main() {
	[ ${#} -eq 1 ] || err "Usage: ${ProgName} distfile"

	local distfile="${1}"; shift

	[ -f Makefile ] && [ -f prepare-import.sh ] || \
	    err 'Must be run from the src/external/bsd/tmux subdirectory'

	local distname="$(get_distname ${distfile})"

	backup_dist
	extract_distfile "${distfile}" "${distname}"
	cleanup_dist
	diff_dirs dist.old dist
	cleantags dist
	log "Don't forget to update the -D flags in usr.bin/tmux/Makefile" \
	    'and to update the version in doc/3RDPARTY'
}

main "${@}"