Rake task to precompile static pages in app/views/static/ folder

precompile_static_pages.rake

module StaticHelpers
  def action_for_template(template)
    File.basename(template).sub(/\.html\.haml$/, '')
  end
end

namespace :static do
  desc "Precompile static pages at public/*.html"
  task :precompile do
    include StaticHelpers
    require 'fileutils'

    # Do the dance of my people
    if ENV["RAILS_ENV"].to_s.empty?
      ENV["RAILS_ENV"] = "production"
      system $0, 'static:precompile'
    else
      # Set up environment if Application is not yet initialized
      unless Rails.application.instance_variable_get('@initialized')
        Rake::Task["environment"].invoke
      end

      app = ActionDispatch::Integration::Session.new(Rails.application)
      base_url = "http://www.example.com"

      actions = Dir.glob(Rails.root.join('app/views/static/[^_]*\.html\.haml')).map do |template|
        action_for_template(template)
      end
      actions << ''  # Root route ('/')

      actions.each do |action|
        output_file = action == '' ? 'index' : action
        puts "Rendering /#{action} => public/#{output_file}.html"

        app.get "#{base_url}/#{action}"

        ApplicationController.cache_page app.response.body, "/#{output_file}.html"
      end

      puts "Static pages generated."
    end
  end

  # Note: If you remove a view template from app/views/static,
  # it's precompiled page will not be deleted from public/
  desc "Delete precompiled static pages"
  task :clean do
    include StaticHelpers

    actions = Dir.glob(Rails.root.join('app/views/static/[^_]*\.html\.haml')).map do |t|
      action_for_template(t)
    end
    actions << 'index'

    actions.each do |action|
      %w(.html .html.gz).each do |ext|
        cached_page = Rails.root.join("public/#{action}#{ext}")
        if File.exists?(cached_page) || File.symlink?(cached_page)
          puts "Deleting public/#{action}#{ext}"
          File.delete cached_page
        end
      end
    end

    puts "Static pages deleted."
  end
end