rubocop git hook

rubocop-git-hook.rb

#!/usr/bin/env ruby
require "fileutils"
require 'bundler/inline'

gemfile do
  source 'https://rubygems.org'
  gem 'tty-command'
end

def check!(project_root, git_root, force_exit = false, rubocop_format = 'fu')
  Bundler.with_clean_env do
    Dir.chdir(project_root) do
      require 'tty-command'
      cmd    = TTY::Command.new(pty: true, printer: :quiet)
      result = cmd.run!("bundle exec rubocop -f #{rubocop_format} --cache true #{ARGV.join { ' ' }}")
      pid = fork do
        if result.status.zero?
          hook_dir = File.join(git_root, ".git/hooks")
          Dir.mkdir(hook_dir) unless Dir.exist?(hook_dir)
          make_bash_file(project_root, "#{hook_dir}/pre-commit", "\u001b[32mRubocop is passing\u001b[0m", 0)
          make_bash_file(project_root, "#{hook_dir}/pre-push", "\u001b[32mRubocop is passing\u001b[0m", 0)
          cmd = TTY::Command.new(pty: true, printer: :null)
          cmd.run!("dir-fingerprint -q #{project_root}")
        else
          hook_dir = File.join(git_root, ".git/hooks")
          Dir.mkdir(hook_dir) unless Dir.exist?(hook_dir)
          make_bash_file(project_root, "#{hook_dir}/pre-commit", result.out, 0)
          make_bash_file(project_root, "#{hook_dir}/pre-push", result.out, 1)
        end
      end
      Process.detach(pid)
      exit result.status
    end
  end
end

def make_bash_file(project_root, path, msg, exit)
  directories = "."
  Dir.chdir(project_root) do
    directories = Dir.glob("./**/*.rb").map { |f| File.dirname(f).split("/")[1] }.uniq.join(" ")
  end

  ruby_file = <<~RUBY_FILE
    #!/usr/bin/env ruby
    results = ""
    Dir.chdir('#{project_root}') do
      results = `dir-fingerprint -q -files #{directories}`.chomp.split("\\n")[3]
    end
    
    if results.include?("true")
      puts "\u001b[33mRubocop out of date\u001b[0m"
      system("RUBOCOP_FORMAT='p' rubocop!")
      exit $?.exitstatus
    else
      puts <<~RUBOCOP_OUTPUT
        #{msg.gsub("\r", " ")}
      RUBOCOP_OUTPUT
      exit #{exit}
    end

  RUBY_FILE
  File.open(path, 'w') do |file|
    file.write(ruby_file)
  end
  FileUtils.chmod("+x", path)
end

check! ENV["DIR"] || `pwd`.chomp, ENV["GIT_ROOT"] || `git rev-parse --show-toplevel`.chomp, ENV["FORCE_EXIT"], ENV["RUBOCOP_FORMAT"] || 'p'