Report credo exit status based on severity, not category

credo_level.sh

#!/bin/bash

######################################################
#
# This script will take the normal credo exit code
# (see https://github.com/rrrene/credo#exit-status)
# and add 64 if any high-severity (non-strict) 
# issues are found and 128 if any low-severity
# (strict) issues are found
# 

tmp=$(mktemp)
mix credo --strict --format oneline | tee "$tmp"
status=${PIPESTATUS[0]}

if grep -qE '[↑↗→]' "$tmp"; then
  status=$(($status + 64))
elif grep -qE '[↘↓]' "$tmp"; then
  status=$(($status + 128))
fi
rm "$tmp"
exit $status