plugin_migrations.rake

namespace :db do
  namespace :migrate do

    task :check_for_pending_plugin_migrations do
      new_migrations = {}
      Dir["vendor/plugins/**/migrations/*.rb"].each do |migration_file|
        path_parts = migration_file.split("/")
        plugin_name = path_parts[path_parts.index("migrations")-1]
        migration_name = path_parts.last
        unless File.exist?(File.join("db", "migrate", migration_name))
          new_migrations[plugin_name] ||= []
          new_migrations[plugin_name] << migration_name
        end
      end
      unless new_migrations.empty?
        puts "The following migrations are included in plugins, but not present in your db/migrate directory:\n\n"
        new_migrations.each do |plugin_name, migrations|
          puts "from '#{plugin_name}':"
          migrations.each { |m| puts "\t#{m}"}
        end
        puts "\nRun db:migrate:plugins to incorporate these migrations into your application."
      end
    end

    desc 'Migrate all plugins'
    task :plugins do
      plugins_to_migrate = ENV['PLUGINS'] || "*"
      new_migrations = {}
      Dir["vendor/plugins/**/#{plugins_to_migrate}/migrations/*.rb"].each do |migration_file|
        FileUtils.cp(migration_file, "db/migrate")
        path_parts = migration_file.split("/")
        plugin_name = path_parts[path_parts.index("migrations")-1]
        migration_name = path_parts.last
        new_migrations[plugin_name] ||= []
        new_migrations[plugin_name] << migration_name
      end
      unless new_migrations.empty?
        puts "The following migrations have been copied into your db/migrate directory:\n\n"
        new_migrations.each do |plugin_name, migrations|
          puts "from '#{plugin_name}':"
          migrations.each { |m| puts "\t#{m}"}
        end
        puts "\nPlease inspect these files to be sure you're happy with what they'll do."
        puts "The migrations will be incorporated the next time you run 'rake db:migrate'."
      end
    end

  end
end