shellcheck/nextnumber

#!/usr/bin/env bash
# TODO: Find a less trashy way to get the next available error code
if ! shopt -s globstar
then
  echo "Error: This script depends on Bash 4." >&2
  exit 1
fi

for i in 1 2 3
do
  last=$(grep -hv "^prop" ./**/*.hs | grep -Ewo "${i}[0-9]{3}" | sort -n | tail -n 1)
  echo "Next ${i}xxx: $((last+1))"
done