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Annotation of loncom/lonmaxima, revision 1.1

1.1     ! www         1: #!/usr/bin/perl
        !             2: #
        !             3: # The LearningOnline Network with CAPA
        !             4: # Connect to MAXIMA CAS
        !             5: #
        !             6: # $Id: $
        !             7: #
        !             8: # Copyright Michigan State University Board of Trustees
        !             9: #
        !            10: # This file is part of the LearningOnline Network with CAPA (LON-CAPA).
        !            11: #
        !            12: # LON-CAPA is free software; you can redistribute it and/or modify
        !            13: # it under the terms of the GNU General Public License as published by
        !            14: # the Free Software Foundation; either version 2 of the License, or
        !            15: # (at your option) any later version.
        !            16: #
        !            17: # LON-CAPA is distributed in the hope that it will be useful,
        !            18: # but WITHOUT ANY WARRANTY; without even the implied warranty of
        !            19: # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
        !            20: # GNU General Public License for more details.
        !            21: #
        !            22: # You should have received a copy of the GNU General Public License
        !            23: # along with LON-CAPA; if not, write to the Free Software
        !            24: # Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
        !            25: #
        !            26: # /home/httpd/html/adm/gpl.txt
        !            27: #
        !            28: 
        !            29: # 
        !            30: # http://www.lon-capa.org/
        !            31: #
        !            32:  
        !            33: use IPC::Open3;
        !            34: use IO::Select;
        !            35: # Scary: cannot use strict!!!
        !            36: ##### use strict;
        !            37: 
        !            38: sub maximareply {
        !            39:     my $cmd=shift;
        !            40:     my $reply='';
        !            41:     my $error='';
        !            42:     my $exitstatus='';
        !            43: 
        !            44:     unless ($cmd=~/\;\n$/) { $cmd.=";\n"; }
        !            45:     my $pid = open3($cmd_in, $cmd_out, $cmd_err, 'maxima');
        !            46:     
        !            47:     $SIG{CHLD} = sub {
        !            48: 	$exitstatus="$? on $pid\n" if waitpid($pid, 0) > 0;
        !            49:     };
        !            50: 
        !            51:     print $cmd_in $cmd;
        !            52:     close $cmd_in;
        !            53: 
        !            54:     my $selector = IO::Select->new( );
        !            55:     $selector->add($cmd_err, $cmd_out);
        !            56:     
        !            57:     while (my @ready = $selector->can_read) {
        !            58: 	foreach my $fh (@ready) {
        !            59: 	    if (fileno($fh) == fileno($cmd_err)) {
        !            60: 		$error.=<$cmd_err>;
        !            61: 	    } else {
        !            62: 		my $line = scalar <$cmd_out>;
        !            63:                 if ($line=~/^(\(\%o|\s)/) {
        !            64:                    $line=~s/^\(.*\)/     /; 
        !            65:                    $reply.=$line; 
        !            66: 	       }
        !            67: 	    }
        !            68: 	    $selector->remove($fh) if eof($fh);
        !            69: 	}
        !            70:     }
        !            71:     close $cmd_out;
        !            72:     close $cmd_err;
        !            73:     return ($reply,$error,$exitstatus);
        !            74: }
        !            75: 
        !            76: print join("\n----\n",&maximareply('1234'));
        !            77: print join("\n----\n",&maximareply('x0: 5;x1: 7;integrate (x^2, x, x0, x1);'));