Git commit hooks for running SwiftLint

add_git_hooks.sh

#!/usr/bin/env bash

DIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )" >/dev/null 2>&1 && pwd )"
echo "Running from" $DIR

ln -s $DIR/pre-commit $DIR/../.git/hooks/pre-commit

pre-commit

#!/bin/bash

echo "Running autocorrect"
swiftlint autocorrect 2>/dev/null | tee /dev/stderr | sed 's/:.*//g' | xargs git add
echo "Running lint"
swiftlint 2>/dev/null | tee /tmp/lintout | grep error:

if [ $? -eq 0 ]; then
	echo "Lint failed. Please address errors above."
	exit 1
fi

for file in `git diff --cached --name-only`; do
	grep "\"$file\"" /tmp/lintout > /tmp/grepout
	if [ $? -eq 0 ]; then
		echo "************************************"
		echo "*    There are warnings in a file you have updated."
		echo "*    Please consider fixing them before pushing."
		echo "*    File: $file"
		echo "************************************"
		cat /tmp/grepout
	fi
done

exit 0

Use SwiftLint to enforce much of your code styling preferences. Install it on your machine using Homebrew.

brew install swiftlint

To take advantage of the autocorrect feature and prevent committing any code with linter errors, use this pre-commit hook. To setup, go to the root project directory and add the two files to a tools folder. Then from that folder in Terminal, run:

./add_git_hooks.sh

Now whenever you go to commit, autocorrect will be applied and any linter errors will prevent the commit from completing.