class Bundler::Env

def git_version
  Bundler::Source::Git::GitProxy.new(nil, nil, nil).version
rescue Bundler::Source::Git::GitNotInstalledError
  "not installed"
end

def read_file(filename)
  File.read(filename.to_s).strip
rescue Errno::ENOENT
  "<No #{filename} found>"
rescue => e
  "#{e.class}: #{e.message}"
end

def report(options = {})
  print_gemfile = options.delete(:print_gemfile)
  print_gemspecs = options.delete(:print_gemspecs)
  out = "Environment\n\n"
  out << "    Bundler   #{Bundler::VERSION}\n"
  out << "    Rubygems  #{Gem::VERSION}\n"
  out << "    Ruby      #{ruby_version}"
  out << "    GEM_HOME  #{ENV["GEM_HOME"]}\n" unless ENV["GEM_HOME"].nil? || ENV["GEM_HOME"].empty?
  out << "    GEM_PATH  #{ENV["GEM_PATH"]}\n" unless ENV["GEM_PATH"] == ENV["GEM_HOME"]
  out << "    RVM       #{ENV["rvm_version"]}\n" if ENV["rvm_version"]
  out << "    Git       #{git_version}\n"
  %w(rubygems-bundler open_gem).each do |name|
    specs = Bundler.rubygems.find_name(name)
    out << "    #{name} (#{specs.map(&:version).join(",")})\n" unless specs.empty?
  end
  out << "\nBundler settings\n\n" unless Bundler.settings.all.empty?
  Bundler.settings.all.each do |setting|
    out << "    " << setting << "\n"
    Bundler.settings.pretty_values_for(setting).each do |line|
      out << "      " << line << "\n"
    end
  end
  if print_gemfile
    out << "\n#{Bundler.default_gemfile.relative_path_from(SharedHelpers.pwd)}\n\n"
    out << "    " << read_file(Bundler.default_gemfile).gsub(/\n/, "\n    ") << "\n"
    out << "\n#{Bundler.default_lockfile.relative_path_from(SharedHelpers.pwd)}\n\n"
    out << "    " << read_file(Bundler.default_lockfile).gsub(/\n/, "\n    ") << "\n"
  end
  if print_gemspecs
    dsl = Dsl.new.tap {|d| d.eval_gemfile(Bundler.default_gemfile) }
    dsl.gemspecs.each do |gs|
      out << "\n#{Pathname.new(gs).basename}:"
      out << "\n\n    " << read_file(gs).gsub(/\n/, "\n    ") << "\n"
    end
  end
  out
end

def ruby_version
  str = "#{RUBY_VERSION}"
  if RUBY_VERSION < "1.9"
    str << " (#{RUBY_RELEASE_DATE}"
    str << " patchlevel #{RUBY_PATCHLEVEL}" if defined? RUBY_PATCHLEVEL
    str << ") [#{RUBY_PLATFORM}]\n"
  else
    str << "p#{RUBY_PATCHLEVEL}" if defined? RUBY_PATCHLEVEL
    str << " (#{RUBY_RELEASE_DATE} revision #{RUBY_REVISION}) [#{RUBY_PLATFORM}]\n"
  end
end

def write(io)
  io.write report(:print_gemfile => true, :print_gemspecs => true)
end