#!/usr/bin/env bash
set -euo pipefail
files="$(git ls-tree -r @ | sed -n 's/^100755 blob \S\+\t//p' | xargs -r grep -Lz '^#!' --)" || [ $? = 123 ]
if [ "$files" ]; then
    echo 'error: non-scripts should not be marked executable (fix with chmod -x):'
    echo
    printf '%s\n' "$files"
    exit 1
fi