Run SwiftLint only on untracked/modified (staged or not)/added swift files from git

swiftlint_modified.sh

if which swiftlint >/dev/null; then
	count=0
	for file_path in $(git ls-files -om --exclude-from=.gitignore | grep ".swift$"); do
		export SCRIPT_INPUT_FILE_$count=$file_path
		count=$((count + 1))
	done
	for file_path in $(git diff --cached --name-only | grep ".swift$"); do
		export SCRIPT_INPUT_FILE_$count=$file_path
		count=$((count + 1))
	done
	
	export SCRIPT_INPUT_FILE_COUNT=$count
	if [ $SCRIPT_INPUT_FILE_COUNT -ne 0 ]; then
		swiftlint lint --use-script-input-files
	fi
else
  echo "warning: SwiftLint not installed, download from https://github.com/realm/SwiftLint"
fi