php-cs-fixer git pre commit hook

pre-commit

#!/bin/sh
# A git pre-commit hook to run php-cs-fixer on all changed php files.
#
# Inspired from https://gist.github.com/jwage/b1614c96ea22ccaf68b7
#
# Author: Elan Ruusamäe <glen@pld-linux.org>
# Date: 2017-05-03
# URL: https://gist.github.com/glensc/cf03265205b67f3735b6fb19ccd4ab2a

set -e

PROJECT_DIR=$(git rev-parse --show-toplevel)
PHP_CS_FIXER="$PROJECT_DIR/php-cs-fixer.phar"
CONFIG_KEY=hooks.php-cs-fixer
AUTOFIX=$(git config $CONFIG_KEY || echo true)
CS_OPTIONS=

msg() {
	if [ -n "$1" ]; then
		echo >&2 "php-cs-fixer: $*"
	else
		sed >&2 -e 's/^/php-cs-fixer: /'
	fi
}

if [ ! -x "$PHP_CS_FIXER" ]; then
	msg <<-EOF

	Please download php-cs-fixer to project root.
	See https://github.com/FriendsOfPHP/PHP-CS-Fixer#installation

	EOF

	exit 1
fi

# list files modified in a commit
# for diff filter: http://stackoverflow.com/a/3068990
git_precommit_changed_files() {
	git diff --cached --name-only --diff-filter=ACM
}

# list modified files in current workspace
git_changed_files() {
	git ls-files -m
}

# accept php files only
php_name_filter() {
	local file
	while read file; do
		case "$file" in
		*.php)
			echo "$file"
		;;
		esac
	done
}

# if ran directly, assume user wants just to fix modified files
if [ -z "$GIT_DIR" ]; then
	# take arguments if specified
	if [ -n "$1" ]; then
		changed_files="$@"
	else
		changed_files=$(git_changed_files | php_name_filter)
	fi
	AUTOFIX=true
else
	changed_files=$(git_precommit_changed_files | php_name_filter)
fi

changed_files=$(echo "$changed_files" | php_name_filter)

if [ -z "$changed_files" ]; then
	exit 0
fi

if [ "$AUTOFIX" = "true" ]; then
	msg "Autofix enabled, to disable: run: git config $CONFIG_KEY false"
else
	CS_OPTIONS="--diff --dry-run"
	msg "Autofix disabled, to enable, run: git config $CONFIG_KEY true"
fi

"$PHP_CS_FIXER" fix --config=$PROJECT_DIR/.php_cs --verbose $CS_OPTIONS $changed_files