#!/bin/bash
# Check that output is a valid ruby script when number of concatenated
# files is fewer than 5, and output should be empty.  We make no
# promises on what happens when 6 or more files are concatenated,
# because we would have already gotten some output at the 5th file.

set -euo pipefail

if [[ $# -ne 5 ]]; then
   echo "$0 <ange.c> <charlotte.c> <dorothy.c> <beatrice.c> <chise.c>"
   exit 1
fi

ANGE=$1
CHARLOTTE=$2
DOROTHY=$3
BEATRICE=$4
CHISE=$5

function test_empty
{
   if ! ( cat $@ | ruby | diff -q /dev/null - ); then
      echo "Unexpected output for order $@"
      exit 1
   fi
}

test_empty $ANGE
test_empty $CHARLOTTE
test_empty $DOROTHY
test_empty $BEATRICE
test_empty $CHISE

test_empty $ANGE $CHARLOTTE
test_empty $CHARLOTTE $DOROTHY
test_empty $DOROTHY $BEATRICE
test_empty $BEATRICE $CHISE
test_empty $CHISE $ANGE

test_empty $DOROTHY $CHARLOTTE $ANGE
test_empty $BEATRICE $DOROTHY $CHARLOTTE
test_empty $CHISE $BEATRICE $DOROTHY
test_empty $ANGE $CHISE $BEATRICE
test_empty $CHARLOTTE $ANGE $CHISE

test_empty $CHARLOTTE $ANGE $DOROTHY $CHISE
test_empty $DOROTHY $CHARLOTTE $BEATRICE $ANGE
test_empty $BEATRICE $DOROTHY $CHISE $CHARLOTTE
test_empty $CHISE $BEATRICE $ANGE $DOROTHY
test_empty $ANGE $CHISE $CHARLOTTE $BEATRICE

exit 0