Soy/closure-templates compilation via Ruby / JRuby

hello_name.soy

{namespace examples.simple}

/**
 * Greets a person using "Hello" by default.
 * @param name The name of the person.
 * @param? greetingWord Optional greeting word to use instead of "Hello".
 */
{template .hello}
  {if not $greetingWord}
    Hello {$name}!
  {else}
    {$greetingWord} {$name}!
  {/if}
{/template}

hello_names.soy

{namespace examples.simple}

/**
 * Greets a person using "Hello" by default.
 * @param name The name of the person.
 * @param? greetingWord Optional greeting word to use instead of "Hello".
 */
{template .helloName}
  {if not $greetingWord}
    Hello {$name}!
  {else}
    {$greetingWord} {$name}!
  {/if}
{/template}

/**
 * Greets a person and optionally a list of other people.
 * @param name The name of the person.
 * @param additionalNames The additional names to greet. May be an empty list.
 */
{template .hello}
  // Greet the person.
  {call .helloName data="all" /}<br>
  // Greet the additional people.
  {foreach $additionalName in $additionalNames}
    {call .helloName}
      {param name: $additionalName /}
    {/call}
    {if not isLast($additionalName)}
      <br>  // break after every line except the last
    {/if}
  {ifempty}
    No additional people to greet.
  {/foreach}
{/template}

jsoy.rb

require 'rubygems'

require 'tilt'
require 'tilt/template'

require 'java'
require 'soy-20100708.jar'

java_import "com.google.template.soy.SoyFileSet"
java_import "com.google.template.soy.data.SoyMapData"
java_import "com.google.template.soy.tofu.SoyTofu"

# http://code.google.com/closure/templates/docs/helloworld_java.html

module Tilt
  class SoyTemplate < Template
    self.default_mime_type = 'application/javascript'

    def self.engine_initialized?; true; end
    def initialize_engine; end
    def prepare; end

    def evaluate(scope, locals, &block)
      sfs = SoyFileSet::Builder.new.add(java.io.File.new(file)).build
      tofu = sfs.compileToJavaObj

      @output = tofu.render("examples.simple.hello", locals, nil)
    end
  end
end

Tilt.register Tilt::SoyTemplate, 'soy'


puts Tilt.new('simple.soy').render
puts Tilt.new('hello_name.soy').render(nil, {'name' => 'Ilya', 'greetingWord' => 'Hola'})
puts Tilt.new('hello_names.soy').render(nil, {'additionalNames' => ['John', 'Bob'], 'name' => 'Ilya', 'greetingWord' => 'Hey'})

# igrigorik { ~/Desktop/soy } > ruby jsoy_template.rb
# Hello world!
# Hola Ilya!
# Hey Ilya!<br>Hello John!<br>Hello Bob!

simple.soy

{namespace examples.simple}

/**
 * Says hello to the world.
 */
{template .hello}
  Hello world!
{/template}

soy_compiler.rb

require 'tilt'
require 'tilt/template'

module Tilt
  class SoyTemplate < Template
    self.default_mime_type = 'application/javascript'

    def self.engine_initialized?; true; end
    def initialize_engine; end
    def prepare; end

    def evaluate(scope, locals, &block)
      out = file.gsub(/soy$/, 'js')
      `java -jar SoyToJsSrcCompiler.jar --outputPathFormat #{out} #{file}`
      @output = IO.read(out)
    end
  end
end

Tilt.register Tilt::SoyTemplate, 'soy'

puts Tilt.new('simple.soy').render

# igrigorik { ~/Desktop/soy } > ruby soy_template.rb
#
# // This file was automatically generated from simple.soy.
# // Please don't edit this file by hand.
#
# if (typeof examples == 'undefined') { var examples = {}; }
# if (typeof examples.simple == 'undefined') { examples.simple = {}; }
#
#
# examples.simple.hello = function(opt_data, opt_sb) {
#   var output = opt_sb || new soy.StringBuilder();
#   output.append('Hello world!');
#   if (!opt_sb) return output.toString();
# };