# if I write
main > one two

# I should get new prompt
main\one\two > 

##</code><code>##

my $term = new Term::ReadLine 'Command Line Interface';
my $attribs = $term->Attribs;
$attribs->{attempted_completion_function} = \&tabCompletionFunction;

sub tabCompletionFunction {

  my ($text, $line, $start, $end) = @_;

  my @tmp = split(/\s+/, $line);
  unshift(@tmp, @prompt);   # the completion should be relative to current prompt

  $attribs->{completion_word} = &getTabCompletionArray(\@tmp);
  return $term->completion_matches($text, $attribs->{list_completion_function});
}

##</code><code>##

$completionsArray = qw(one two three four);   # found by &getTabCompletionArray

##</code><code>##

current prompt > xdd