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def call_with_password(user, url, &block)
  abort "misformed URL #{url}" unless url =~ %r{^(\w+)://([^/]+)(.*?/?)[^/]*$}
  proto, host, path = $1, $2, $3

  action = :retry

  res = %x{security find-internet-password -g -a "#{user}" -s "#{host}" -p "#{path}" -r #{proto} 2>&1 >/dev/null}
  action = block.call($1) if res =~ /^password: "(.*)"$/
    
  while action == :retry
    cd_path = ENV['TM_SUPPORT_PATH'] + '/bin/CocoaDialog.app/Contents/MacOS/CocoaDialog'
    res = %x{"#{cd_path}" secure-standard-inputbox \
      --title "Enter Password" \
      --informative-text "Enter password for “#{user}” at host “#{host}”"
    }
    break if res[0] == ?2

    action = block.call(res[2..-2])
    if action == :save_password then
      %x{security add-internet-password -a "#{user}" -s "#{host}" -r "#{proto}" -p "#{path}" -w "#{res[2..-2]}"}
    end
  end
end

call_with_password('duff', 'http://example.com/blog/xmlrpc.php') do |pw|
  p pw
  pw == "foo" ? :retry : :save_password
end