'composer install' git post-checkout hook

post-checkout

# .git/hooks/post-checkout

changed_files="$(git diff-tree -r --name-only --no-commit-id $1 $2)"

composer_install_on_changed_lockfile() {
    echo "$changed_files" | grep --quiet "composer.lock" && 
    echo "Changes to 'composer.lock' detected; running 'composer install'." && 
    composer install
}

composer_install_on_changed_lockfile

exit 0;