#play2.1 custom #MessagesPlugin to add messages from different sources

CustomMessagesPlugin.scala

package play.api.i18n

import play.api._
import play.api.i18n._

import scala.collection.JavaConverters._

import scalax.file._
import scalax.io.JavaConverters._

/**
 * Play Plugin for internationalisation.
 */
class CustomMessagesPlugin(app: Application) extends MessagesPlugin(app) {

  def loadMessages(file: String): Map[String, String] = {
    app.classloader.getResources(file).asScala.toList.reverse.map { messageFile =>
      new Messages.MessagesParser(messageFile.asInput, messageFile.toString).parse.map { message =>
        message.key -> message.pattern
      }.toMap
    }.foldLeft(Map.empty[String, String]) { _ ++ _ }
  }

  def messages = ( Lang.availables(app)
        .map( l => ( l.code, "message.%s".format(l.code)) ) :+ ( ("default", "messages") ) )
        .map { files =>
          // Add custom loading here
          (files._1, loadMessages(files._2) )
        }.toMap

  /**
   * The underlying internationalisation API.
   */
  override lazy val api = MessagesApi(messages)

  /**
   * Loads all configuration and message files defined in the classpath.
   */
  override def onStart() = api

}

play.plugins

50:play.api.i18n.CustomMessagesPlugin