# -*- ruby -*-

#
# I miss rake db:migrate, so here's a lightweight way to get code to
# run exactly once on each deployment.
#
# Here's the framework, which ideally shouldn't need to be touched
# often (though I'm sure there are bugs and possibly some missing
# features); the migrations themselves go in migrations.rake.
#

desc "Perform unperformed CouchDB migrations"
task :migrate => :environment do
  schema = begin
             CouchRestRails::Document.get("migration-list")
           rescue RestClient::ResourceNotFound
             CouchRestRails::Document.new(:_id => "migration-list")
           end

  # there HAS to be a better way to get all the tasks in a namespace, but
  # I can't find one.
  migrations = Rake::Task.tasks.select{ |t| t.name =~ /^migrations:/ }

  begin
    migrations.sort{|a, b| a.name <=> b.name}.each do |migration|
      unless schema[migration.to_s]
        puts
        puts "== running #{migration.to_s}"

        migration.invoke

        schema[migration.to_s] = true
      end
    end
  ensure
    schema.save
  end
end