#!/usr/bin/env bash

# The reason we do `find`/`while read`-loops instead of `find -exec` commands
# is that we want errors from the inner loop to bubble up.

fixup_makefiles() (
	find "$@" -type f -name Makefile | while read -r filename; do
		{
			<"$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
			printf '=> libdir %q\n' "$dir"
			lib="${dir##*/}"
			find "$dir" -type f | while read -r filename; do
				printf ' => sed -ir %q %q\n' "s|$lib/||" "$filename"
				sed -r "s|$lib/||" < "$filename" | build-aux/write-ifchanged "$filename"
			done
		done
	fi

	find "$@" \( -name '*.h' -o -name '*.c' -o -name '*.gperf' \) -type f | while read -r filename; do
		"$0"--includes "$filename"
	done
)

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

main "$@"