Overcommit git pre-commit hook to check sources for Xcode template comments

.overcommit.yml

PreCommit:
  NoXcodeTemplateComments:
    description: 'Checking for Xcode template comments'
    enabled: true
    quiet: true
    exclude:
      - 'Pods/**/*.*'
    include:
      - '**/*.h'
      - '**/*.m'
      - '**/*.c'
      - '**/*.cpp'
      - '**/*.swift'    

no_xcode_template_comments.rb

module Overcommit::Hook::PreCommit
  class NoXcodeTemplateComments < Base
    def run
      errors = []
      boilerplate = ['Created by', 'Copyright']
      applicable_files.each do |file|
        File.open(file, 'r').each_with_index do |line, index|
          break if index > 10
          boilerplate.each do |text|
            comment = "// #{text} "
            if line.start_with?(comment)
              relative = Pathname(file).relative_path_from(Pathname(Overcommit::Utils.repo_root))
              errors << "#{relative}:#{index} starts with #{comment}"
            end
          end
        end
      end

      return :fail, errors.join("\n") if errors.any?

      :pass
    end
  end
end