#!/bin/bash

# argument: directory path

# prints file count and sum of file sizes

find "$1" -type f -print0 \

	| relpipe-in-filesystem \

		--file path \

		--file size \

		--relation 'f.*' \

		--output-attribute 'count' integer \

		--output-attribute 'sum'   integer \

		--before-records '

			(define $sum   0)

			(define $count 0)

			(define return-sum #f)' \

		--for-each '

			(set! $sum   (+ $sum   $size) )

			(set! $count (+ $count 1    ) )' \

		--where '#f' \

		--after-records '(set! return-sum #t)' \

		--has-more-records '

			(if return-sum

				(begin (set! return-sum #f) #t)

				#f

			)' \

	| relpipe-out-tabular