class Jeweler::GemSpecHelper

def gem_path
  File.join(@base_dir, 'pkg', parse.file_name)
end

def has_version?
  !@spec.version.nil?
end

def initialize(spec, base_dir = nil)
  self.spec = spec
  self.base_dir = base_dir || ''
  yield spec if block_given?
end

def normalize_files(array_attribute)
  array = @spec.send(array_attribute)
  # only keep files, no directories, and sort
  array = array.select do |path|
    File.file? File.join(@base_dir, path)
  end.sort
  @spec.send("#{array_attribute}=", array)
end

def parse
  data = self.to_ruby
  parsed_gemspec = nil
  Thread.new { parsed_gemspec = eval("$SAFE = 3\n#{data}", binding, path) }.join
  parsed_gemspec
end

def path
  denormalized_path = File.join(@base_dir, "#{@spec.name}.gemspec")
  absolute_path = File.expand_path(denormalized_path)
  absolute_path.gsub(Dir.getwd + File::SEPARATOR, '') 
end

def prettyify_array(gemspec_ruby, array_name)
  gemspec_ruby.gsub(/s\.#{array_name.to_s} = \[.+?\]/) do |match|
    leadin, files = match[0..-2].split("[")
    
    leadin + "[\n    #{files.gsub(%|", "|, %|",\n    "|)}\n  ]"
  end
end

def to_ruby
  normalize_files(:files)
  normalize_files(:extra_rdoc_files)
  gemspec_ruby = @spec.to_ruby
  gemspec_ruby = prettyify_array(gemspec_ruby, :files)
  gemspec_ruby = prettyify_array(gemspec_ruby, :extra_rdoc_files)
  gemspec_ruby = <<-END
nerated by jeweler
 NOT EDIT THIS FILE DIRECTLY
stead, edit Jeweler::Tasks in #{Rake.application.rakefile}, and run 'rake gemspec'
mspec_ruby}
    END
end

def update_version(version)
  @spec.version = version.to_s
end

def valid?
  begin
    parse
    true
  rescue
    false
  end
end

def write
  File.open(path, 'w') do |f|
    f.write self.to_ruby
  end 
end