#!/bin/sh -eu
# When invoked with a relative filename for the file “default.do” as
# an argument, redo-whichdo must not output that filename as possible
# dofile.

default_dofile="default.do"

whichdo_dofiles=$(
 redo-whichdo "${default_dofile}" \
   |tr '\0' '\n'
)

for whichdo_dofile in ${whichdo_dofiles}; do
 case "${whichdo_dofile}" in
  "${PWD}/${default_dofile}")
   >&2 printf 'redo-whichdo outputs that this file is its own dofile: %s\n' \
    "${whichdo_dofile}"
   exit 1
  ;;
 esac
done