#!/usr/bin/perl
#
# The LearningOnline Network with CAPA
# Connect to MAXIMA CAS
#
# $Id: lonmaxima,v 1.1 2006/03/03 16:07:34 www Exp $
#
# Copyright Michigan State University Board of Trustees
#
# This file is part of the LearningOnline Network with CAPA (LON-CAPA).
#
# LON-CAPA is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# LON-CAPA is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with LON-CAPA; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
#
# /home/httpd/html/adm/gpl.txt
#
#
# http://www.lon-capa.org/
#
use IPC::Open3;
use IO::Select;
# Scary: cannot use strict!!!
##### use strict;
sub maximareply {
my $cmd=shift;
my $reply='';
my $error='';
my $exitstatus='';
unless ($cmd=~/\;\n$/) { $cmd.=";\n"; }
my $pid = open3($cmd_in, $cmd_out, $cmd_err, 'maxima');
$SIG{CHLD} = sub {
$exitstatus="$? on $pid\n" if waitpid($pid, 0) > 0;
};
print $cmd_in $cmd;
close $cmd_in;
my $selector = IO::Select->new( );
$selector->add($cmd_err, $cmd_out);
while (my @ready = $selector->can_read) {
foreach my $fh (@ready) {
if (fileno($fh) == fileno($cmd_err)) {
$error.=<$cmd_err>;
} else {
my $line = scalar <$cmd_out>;
if ($line=~/^(\(\%o|\s)/) {
$line=~s/^\(.*\)/ /;
$reply.=$line;
}
}
$selector->remove($fh) if eof($fh);
}
}
close $cmd_out;
close $cmd_err;
return ($reply,$error,$exitstatus);
}
print join("\n----\n",&maximareply('1234'));
print join("\n----\n",&maximareply('x0: 5;x1: 7;integrate (x^2, x, x0, x1);'));
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