class Gem::Commands::BuildCommand

def arguments # :nodoc:
  "GEMSPEC_FILE  gemspec file name to build a gem for"
end

def description # :nodoc:
  <<-EOF
e build command allows you to create a gem from a ruby gemspec.
e best way to build a gem is to use a Rakefile and the Gem::PackageTask
ich ships with RubyGems.
e gemspec can either be created by hand or extracted from an existing gem
th gem spec:
$ gem unpack my_gem-1.0.gem
Unpacked gem: '.../my_gem-1.0'
$ gem spec my_gem-1.0.gem --ruby > my_gem-1.0/my_gem-1.0.gemspec
$ cd my_gem-1.0
[edit gem contents]
$ gem build my_gem-1.0.gemspec
  EOF
end

def execute
  gemspec = get_one_gem_name
  unless File.exist? gemspec
    gemspec += '.gemspec' if File.exist? gemspec + '.gemspec'
  end
  if File.exist? gemspec then
    spec = Gem::Specification.load gemspec
    if spec then
      Gem::Package.build spec, options[:force]
    else
      alert_error "Error loading gemspec. Aborting."
      terminate_interaction 1
    end
  else
    alert_error "Gemspec file not found: #{gemspec}"
    terminate_interaction 1
  end
end

def initialize
  super 'build', 'Build a gem from a gemspec'
  add_option '--force', 'skip validation of the spec' do |value, options|
    options[:force] = true
  end
end

def usage # :nodoc:
  "#{program_name} GEMSPEC_FILE"
end