swift-format git pre-commit hook

pre-commit

#!/bin/bash
if which swift-format >/dev/null; then

    git diff --diff-filter=d --staged --name-only | grep -e '\(.*\).swift$' | while read line; do
        swift-format -m format -i "${line}";
        git add "$line";
    done
    exit 0
else
    echo "warning: swift-format not installed"
fi