#!/usr/bin/env ratch

# generate gem package

# TODO: Should this use staging too, like zip/tgz?

begin
  require 'rubygems/specification'
  Gem::manage_gems
rescue LoadError
  raise LoadError, "RubyGems is not installed?"
end

# Create a Gem package.

main 'pack/gem' do
  status "Creating .gem package"

  config = configuration['pack'] || {}
  config = config['gem'] || {}

  package = package().clone
  package.update(config)

  store = config[:store] || 'pkg'

  #dir  = Dir.pwd

  file = nil
  #cd(dir) do
    #status "vi #{metadata.name}.gemspec"
    builder = ::Gem::Builder.new(gemspec(package))
    status "gem build #{package.name}"
    unless dryrun?
      file = builder.build
      file = File.expand_path(file)
    end
  #end

  transfer(file, store)
end

# Transfer package file to storage location.

def transfer(file, store)
  dest = File.join(store, File.basename(file))    # move to store, unless already there
  dest = File.expand_path(dest)
  mv(file, store) unless file == dest
end

# Create Gem::Specification.

def gemspec(package)
  distribute = package.filelist
  #distribute = Dir.multiglob_with_default( '**/*', distribute )

  ::Gem::Specification.new do |spec|
    spec.name              = package.name
    spec.version           = package.version
    spec.summary           = package.brief
    spec.description       = package.description
    spec.author            = package.author
    spec.email             = package.email
    spec.rubyforge_project = package.development if /rubyforge.org/ =~ package.development
    spec.homepage          = package.homepage

    # Platform: ruby, mswin32, i586-linux, powerpc-darwin, current
    spec.platform = 'ruby'  # TODO current support!

    spec.require_paths = [package.gem_path].flatten.reverse

    #if package.platform != 'ruby'
    #  spec.require_paths.concat(spec.require_paths.collect{ |d| File.join(d, platform) })
    #end

    spec.bindir = "bin"
    spec.executables  = package.executables
    spec.requirements = package.requirements
    spec.has_rdoc     = package.document

    if package.dependencies
      package.dependencies.each do |d,v|
        spec.add_dependency(*[d,v].compact)
      end
    end

    spec.extensions = package.compile

    spec.files = distribute

    spec.test_files = distribute.select{ |f| f =~ /^test\// }  # TODO make test_files configurable
  end
end