Buildr Extension for precompiling JSP files.

precompiler.rb

module Precompiler
  include Extension
  
  first_time do
    # Define task not specific to any projet.
    desc 'Precompile jsps'
    Project.local_task('precompile' => 'compile') { |name| "Precompiling #{name}" }   
  end

  before_define do |project|
    # Define the precompile task for this particular project.
    project.task('precompile'=>project.task('compile'))
    project.group ||= project.parent && project.parent.group || project.name
    project.version ||= project.parent && project.parent.version
  end

  # To use this method in your project:
  #   precompile :keep=>true
  def precompile(*args)
    options = args.pop
    keep = options[:keep]

    Rake::Task.define_task 'precompile' do |task|
      webxml = File.join(project.path_to(:src, :main, :webapp), "WEB-INF", "web.xml")
      ant('precompile') do |ant|
        ant.taskdef :resource=>'org/apache/catalina/ant/catalina.tasks' do |ant|
          ant.classpath do |ant|
            Dir.glob(File.join(TOMCAT_HOME, "lib", "*.jar")) do |f|
              ant.fileset :file=>f
            end 
            JASPER.each do |f|
              ant.fileset :file=>artifact(f)
            end 
            project.compile.dependencies.each do |f| 
              ant.fileset :file=>artifact(f)
            end
            ant.pathelement :location => project.path_to(:target, :classes)
            ant.fileset :file=>artifact(:taglibs)
          end
        end
        # Jasper is not creating the generated_web.xml, so start with the original web.xml
        mkdir_p  File.join(project.path_to(:target, :generated), "WEB-INF")
        cp webxml, File.join(project.path_to(:target, :generated), "WEB-INF", "generated_web.xml"), :verbose=>true
        ant.jasper2 :validateXml=>false, :uriroot=>project.path_to(:src, :main, :webapp), :compilerTargetVM=>"1.5", :compilerSourceVM=>"1.5", :webXmlFragment=>File.join(project.path_to(:target, :generated), "WEB-INF", "generated_web.xml"), :outputDir=>File.join(project.path_to(:target, :generated))
        if keep
          # if we're not just precompiling for a sanity check, compile the servlets into the WEB-INF/classes dir
          ant.javac :includeantruntime=>false, :fork=>true, :destdir=>project.path_to(:target, :classes), :optimize=>"on", :failonerror=>false, :srcdir=>File.join(project.path_to(:target, :generated)), :memoryInitialSize=>"512m",
          :memoryMaximumSize=>"1024m", :excludes=>"**/*.smap", :source=>"1.5", :target=>"1.5", :includes=>"**/*.java" do
            ant.compilerarg :line=>"-Xlint:none"
            ant.classpath do |ant|
              Dir.glob(File.join(TOMCAT_HOME, "lib", "*.jar")) do |f|
                ant.fileset :file=>f
              end
              ant.pathelement :location => project.path_to(:target, :classes)
              project.compile.dependencies.each do |f| 
                ant.fileset :file=>artifact(f)
              end
              ant.fileset :file=>artifact(:taglibs)
            end # end classpath
            ant.include :name=>"**"
            ant.exclude :name=>"tags/**"
          end # end javac
        
          # Copy the generated_web.xml content into the web.xml in the generated directory
          open(File.join(project.path_to(:target, :generated), "WEB-INF", "web.xml"), 'w') do |file|
            original = File.read(webxml)
            generated = File.read(File.join(project.path_to(:target, :generated), "WEB-INF", "generated_web.xml"))
            file.write(original.gsub("</web-app>", generated))
            file.write("</web-app>")
          end # end new web.xml
          project.packages.first.enhance do |task|
            project.packages.first.include(File.join(project.path_to(:target, :generated), "WEB-INF", "web.xml"), :as=>'WEB-INF/web.xml')
          end # end tell war about new web.xml
          # sh %{svn revert #{webxml}}
        end  # end if keep
      end # end ant precompile task 
    end # end rake define_task
  end # end def precompile()
end

class Buildr::Project
  include Precompiler
end