Pylint wrapper with scripting-friendly exit codes

lint.sh

#!/usr/bin/env sh

# Wraps Pylint invocation to produce shell-friendly exit codes
# Because Pylint exit codes are weird:
# https://docs.pylint.org/en/1.6.0/run.html#exit-codes

PYTHON_EXECUTABLE=python
if [ ! -z $PYTHON_ENV ]; then
    PYTHON_EXECUTABLE="$PYTHON_ENV/bin/python"
fi

${PYTHON_EXECUTABLE} -m pylint $@

PYLINT_EXIT_CODE=$?

exit $(($PYLINT_EXIT_CODE % 4))