JarCastingTwirl 
Twirl is the Play template engine.
Twirl is automatically available in Play projects and can also be used stand-alone without any dependency on Play.
See the Play documentation for the template engine for more information about the template syntax.
sbt-twirl
Twirl can also be used outside of Play. An sbt plugin is provided for easy integration with Scala or Java projects.
sbt-twirl requires sbt 1.3.0 or higher.
To add the sbt plugin to your project add the sbt plugin dependency in project/plugins.sbt:
addSbtPlugin("com.typesafe.sbt" % "sbt-twirl" % "LATEST_VERSION")
Replacing the LATEST_VERSION with the latest version published, which should be 
someProject.enablePlugins(SbtTwirl)
If you only have a single project and are using a build.sbt file, create a root project and enable the twirl plugin like this:
lazy val root = (project in file(".")).enablePlugins(SbtTwirl)
Template files
Twirl template files are expected to be placed under src/main/twirl or src/test/twirl, similar to scala or java sources. The source locations for template files can be configured.
Template files must be named {name}.scala.{ext} where ext can be html, js, xml, or txt.
The Twirl template compiler is automatically added as a source generator for both the main/compile and test configurations. When you run compile or test:compile the Twirl compiler will generate Scala source files from the templates and then these Scala sources will be compiled along with the rest of your project.
Additional imports
To add additional imports for the Scala code in template files, use the templateImports key. For example:
TwirlKeys.templateImports += "org.example._"
Source directories
To configure the source directories where template files will be found, use the sourceDirectories in compileTemplates key. For example, to have template sources alongside Scala or Java source files:
sourceDirectories in (Compile, TwirlKeys.compileTemplates) := (unmanagedSourceDirectories in Compile).value
Credits
The name twirl was thought up by the Spray team and refers to the magic @ character in the template language, which is sometimes called "twirl".
The first stand-alone version of Twirl was created by the Spray team.
An optimized version of the Twirl parser was contributed by the Scala IDE team.
