#!/bin/sh
set -eu
exec awk '
BEGIN { FS = "\t"; OFS = "\t|" }
{ $1 = $1; print }
NR == 1 {
	printf "%s", "---"
	for (i = 1; i < NF; ++i)
		printf "%s", OFS "---"
	print ""
}
' "$@" |column -ts"$(printf '\t')"