#!/bin/sh
set -eu

usage() {
	cat <<-'EOF'
		Usage:
		  mandir (install|uninstall) DESTDIR MANPAGES...
	EOF
}


ACTION="${1:-}"
DESTDIR="${2:-}"
eval "$(assert-arg -- "$ACTION"  'ACTION')"
eval "$(assert-arg -- "$DESTDIR" 'DESTDIR')"
shift
shift


ldirnames() {
	find "$@" | xargs -I% basename % |
		sed 's|^\(.*\)\.\([a-z][a-z]\)\.\(.*\)$|\2/man\3|'
}

dirnames() {
	ldirnames "$@" |                sort | uniq
	ldirnames "$@" | cut -d/ -f2- | sort | uniq
}

if [ "$ACTION" = 'install' ]; then
	dirnames "$@" | xargs -I% mkdir -p "$DESTDIR"/%
fi

for f in "$@"; do
	lang="$(   printf '%s\n' "$f" | cut -d. -f2)"
	section="$(printf '%s\n' "$f" | cut -d. -f3-)"
	name="$(basename "${f%."$lang"."$section"}")"
	nameext="$name.$section"
	case "$ACTION" in
		(install)
			cp "$f" "$DESTDIR/$lang/man${section}/$nameext"
			ln -fs "../en/man${section}/$nameext" \
				"$DESTDIR/man${section}/$nameext"
			;;
		(uninstall)
			rm -f \
				"$DESTDIR/$lang/man${section}/$nameext" \
				"$DESTDIR/man${section}/$nameext"
			;;
		(*)
			usage >&2
			exit 2
			;;
	esac
done