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#!/usr/bin/env bash
# Copyright (C) 2015-2016  Luke Shumaker

fixup_makefiles() (
	find "$@" -type f -name Makefile | while read -r filename; do
		>&2 printf ' => fixup %q\n' "$filename"
		{
			<"$filename" sed -r \
			 -e "s|(/\.\.)*/config.mk|/$(realpath -ms --relative-to="$(dirname -- "$filename")" config.mk)|" \
			 -e '/^nested\.subdirs/d' \
			 -e '/^include \$\(topsrcdir\)\/build-aux\/Makefile\.tail\.mk$/d'
			echo
			find "$(dirname "$filename")" -mindepth 2 -maxdepth 2 -name Makefile -print0 |
			    xargs -r0 dirname -z -- |
			    xargs -r0 basename -a -z |
			    xargs -r0 printf 'nested.subdirs += %s\n' | sort
			echo
			echo 'include $(topsrcdir)/build-aux/Makefile.tail.mk'
		} | cat -s | build-aux/write-ifchanged "$filename"
	done
)

fixup_includes() (
	dirs=($(find "$@" -type d -name include))
	if [[ ${#dirs[@]} -gt 0 ]]; then
		find "${dirs[@]}" -type d | while read -r dir; do
			lib="${dir##*/}"
			find "$dir" -type f | while read -r filename; do
				>&2 printf ' => sed -r %q < %q\n' "s|$lib/||" "$filename"
				sed -r "s|$lib/||" < "$filename" | build-aux/write-ifchanged "$filename"
			done
		done
	fi

	# We wrap the $0--includes program with `sh` because xargs only exits
	# early if the status is 255, but we want to exit early for all
	# non-zero statuses.  We use xargs instead of -exec because -exec won't
	# do much of anything useful with the exit status.
	rm -rf -- "$0"--includes.cache
	find "$@" \( -name '*.h' -o -name '*.c' -o -name '*.gperf' -o -name '*.gperf.m4' \) -type f -print0 |
		xargs -r0 sh -c "$0--includes \"\$@\" || exit 255" --
	rm -rf -- "$0"--includes.cache
)

main() {
	set -e
	set -o pipefail
	export LC_COLLATE=C
	fixup_makefiles "$@"
	fixup_includes "$@"
}

main "$@"