ratpack.rb

# Encoding: utf-8
# Cloud Foundry Java Buildpack
# Copyright 2013 the original author or authors.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#      http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

require 'java_buildpack/component/base_component'
require 'java_buildpack/container'
require 'java_buildpack/util/dash_case'
require 'java_buildpack/util/ratpack_utils'

module JavaBuildpack::Container

  # Encapsulates the detect, compile, and release functionality for Ratpack applications.
  class Ratpack < JavaBuildpack::Component::BaseComponent

    def initialize(context)
      super(context)
    end

    def detect
      JavaBuildpack::Util::RatpackUtils.is?(@application) ? id(version) : nil
    end

    def compile
      @droplet.additional_libraries.link_to lib_dir
    end

    def release
      @droplet.java_opts.add_system_property 'ratpack.port', '$PORT'

      [
          @droplet.java_home.as_env_var,
          @droplet.java_opts.as_env_var,
          "$PWD/#{start_script.relative_path_from(@application.root)}"
      ].flatten.compact.join(' ')
    end

    private

    RATPACK_CORE_FILE_PATTERN = 'lib/ratpack-core-*.jar'.freeze

    def id(version)
      "#{Ratpack.to_s.dash_case}=#{version}"
    end

    def lib_dir
      root + 'lib'
    end

    def root
      roots = (@droplet.root + '*').glob.select { |child| child.directory? }
      roots.size == 1 ? roots.first : @droplet.root
    end

    def start_script
      candidates = (root + 'bin/*').glob
      candidates.size == 1 ? candidates.first : candidates.find { |candidate| Pathname.new("#{candidate}.bat").exist? }
    end

    def version
      (root + RATPACK_CORE_FILE_PATTERN).glob.first.to_s.match(/.*ratpack-core-(.*)\.jar/)[1]
    end

  end

end