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Scalate integration with JRuby to access Ruby based filters such as sass

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package org.fusesource.scalate.jruby

import org.fusesource.scalate.util.Log
import org.fusesource.scalate.{TemplateException, RenderContext, TemplateEngine, TemplateEngineAddOn}
import java.io.File
import org.fusesource.scalate.servlet.ServletRenderContext
import org.fusesource.scalate.filter.{NoLayoutFilter, CssFilter, Pipeline, Filter}

/**
 * 
 * 
 *
 * @author Hiram Chirino
 */
object Sass extends TemplateEngineAddOn with Log {

  def apply(te: TemplateEngine) = {
    val jruby = new JRuby(List[File]())
    if (!te.filters.contains("sass")) {
      val sass = new Sass(jruby, te)
      te.filters += "sass" -> Pipeline(List(sass, CssFilter))
      te.pipelines += "sass" -> List(NoLayoutFilter(sass, "text/css"))
      te.templateExtensionsFor("css") += "sass"
    }

    if (!te.filters.contains("scss")) {
      val scss = new Scss(jruby, te)
      te.filters += "scss" -> Pipeline(List(scss, CssFilter))
      te.pipelines += "scss" -> List(NoLayoutFilter(scss, "text/css"))
      te.templateExtensionsFor("css") += "scss"
    }
  }
}

class Sass(val jruby:JRuby, val engine: TemplateEngine) extends Filter {

  def syntax = "sass"

  def filter(context: RenderContext, content: String) = {

    var result: StringBuffer = new StringBuffer
    jruby.put("@result", result)
    jruby.run(
      "require 'haml-3.0.25/lib/sass'",
      "options = {}",
      "options[:load_paths] = ["+context.engine.sourceDirectories.map("'"+_+"'").mkString(",")+"]",
      "options[:cache_location] = '"+engine.workingDirectory+"/sass'",
      "options[:style] = " + (if (engine.isDevelopmentMode) ":expanded" else ":compressed") + "",
      "options[:line_comments] = " + (if (engine.isDevelopmentMode) "true" else "false") + "",
      "options[:syntax] = :"+syntax,
      "content = < result.toString
      case Left((exception, errors)) =>
        val err1 = """(?m)([a-zA-Z_0-9-]+[.]s[ca]ss:\d+:.+)$""".r
        val err2 = """([(]s[ca]ss[)]:\d+:.+)$""".r
        errors match {
          case err1(msg) => throw new TemplateException(msg, exception)
          case err2(msg) => throw new TemplateException(msg, exception)
        }
        throw new TemplateException(errors, exception)
    }
  }

}

class Scss(jruby:JRuby, engine: TemplateEngine) extends Sass(jruby, engine) {
  override def syntax = "scss"
}