namespace :nanoc do
  require "bundler/setup"
  cwd = File.realpath File.join(__dir__, "..")

  desc "Clean the build/ directory"
  task :clean do
    Dir.chdir(cwd) do
      sh "rm -rf node_modules/.cache/"
      sh "rm -rf build"
    end
  end

  desc "Produce the build/ directory"
  task :build do
    Dir.chdir(cwd) do
      # FIXME: discover why rm -rf build/css/ is needed.
      ENV["NODE_ENV"] = "production"
      sh "rm -rf build/css/"
      Bundler.with_unbundled_env { sh "bundle exec nanoc co" }
    end
  end

  desc "Produce the build/ directory on-demand"
  task watch: ['nanoc:build'] do
    Dir.chdir(cwd) do
      require "listen"
      path = File.join(Dir.getwd, "src")
      Listen.to(path) do
        Bundler.with_unbundled_env { sh "rake nanoc:build" }
      end.start
      sleep
    end
  rescue Interrupt
    warn "SIGINT: exit"
    exit
  end
end