#!/bin/sh -eu
# When invoked with a relative path name with the prefix “default” as
# an argument, redo-whichdo must not output any dofile filename twice.

default_files="default default.a default.a.b default.do default.a.do default.a.b.do"

for default_file in ${default_files}; do
 whichdo_dofiles_duplicates=$(
  redo-whichdo "${default_file}" \
   |tr '\0' '\n' \
   |sort \
   |uniq -d
 )
 case "${whichdo_dofiles_duplicates}" in
  '')
   ;;
  *)
   >&2 printf 'redo-whichdo duplicate output: %s \n' ${whichdo_dofiles_duplicates}
   exit 1
  ;;
 esac
done