#!/usr/bin/ruby
#
# Licensed to the Apache Software Foundation (ASF) under one or more
# contributor license agreements.  See the NOTICE file distributed with
# this work for additional information regarding copyright ownership.
# The ASF licenses this file to You 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.
#

# This script is used to roll the version numbers of all modules up.
# The version number is always determined from the master POM's version number.
# However, when changing version number of the master POM, every module must have
# it's <parent>/<version> element updated.  That's what this script is for.

# Rub gems:  Think of it as Maven for Ruby but not brain-damaged. See http://www.rubygems.org/read/book/1

require 'rubygems'

# This script requires the Ruby gem hpricot ("gem install hpricot"). It was built with version 0.6.
# http://code.whytheluckystiff.net/hpricot

require 'hpricot'

# This script doesn't bother with optparse, it's just a single command line option: the new version number.
# Use with care!

$version = ARGV[0]

def read_pom(file)
  open(file) do |f|
    Hpricot.XML(f)
  end
end

def write(file, pom)
  puts "Updating #{file} ..."
  
  File.open(file, "w") do |stream|
    stream << pom
  end  
end

def edit_pom(file)
  pom = read_pom(file)
  yield pom
  write(file, pom)
  find_modules(pom).sort.each do |mod_name|
    child_file = "#{File.dirname(file)}/#{mod_name}/pom.xml"
    edit_pom(child_file) do |pom|
      update_element(pom.at("/project/version"))
      update_element(pom.at("/project/parent/version"))
    end
  end
end

def find_modules(pom)
  modules = []
  # Add submodules
  (pom/"project/modules/module").each { |elem| modules << elem.inner_html }
  # Add submodules which are activated via a profile
  (pom/"project/profiles/profile/modules/module").each { |elem| modules << elem.inner_html }

  modules
end

def update_element(el)
    el.inner_html = $version if el
end

def update_poms()
  edit_pom("pom.xml") do |pom|
    update_element(pom.at("/project/version"))
  end
end

puts "Updating to version #{$version} ..."
update_poms()