#! /usr/bin/perl -w
use warnings;
use diagnostics;
use strict;
use Expect qw(expect);
use Carp;

scalar @ARGV or croak "usage: $0 host1...";

my $session = Expect->spawn( 'clogin', $ARGV[0] );
if ( exists $ENV{'exp_internal'} ) { $session->exp_internal(1) }
$session->log_stdout(1);

sub expect_send {
    my $pattern = shift;
    my $command = shift;
    my $ret     = $session->expect(
        30,
        [ '-re', $pattern => sub { $_[0]->send("$command\n") } ],
        @_,
        [ timeout => sub { croak 'Timeout' } ],
        [ eof     => sub { croak 'EOF (clogin exited unexpectedly)' } ],
    );
    croak 'Nothing matched, not even timeout, died'
      if not defined $ret;
    return $ret;
}

expect_send qr/#/, 'show clock';
expect_send qr/#/, 'show logging';
$session->expect(
    30,
    [
        '-re',
        qr/Log Buffer \(\d+ bytes\)/i => sub {
            $session->match() =~ /\((\d+) bytes\)/i;
            print "\n\n* Found logging buffer size is $1 bytes *\n\n";
            if ( $1 < 8192 ) {
                expect_send qr/#/,            'configure terminal';
                expect_send qr/\(config\)#/i, 'logging buffered 8192';
                expect_send qr/\(config\)#/i, 'end';
                expect_send qr/#/,            'write memory';
            }
          }
    ],
);
expect_send qr/#/, 'exit';
$session->soft_close;