#!/usr/bin/perl

# The LearningOnline Network with CAPA
# Converts a texxml file into a single tex file
#
# 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/
#
# 7-16-2002 Jeremy Bowers

use strict;
use HTML::TokeParser;
use GDBM_File;
use File::Temp;

# accept texxml document on standard in
my $p = HTML::TokeParser->new( $ARGV[0] );
my $dirprefix = "../../loncom/html/adm/help/tex/";

# Make myself a temp dir for processing POD
my $tmpdir = File::Temp::tempdir('loncapahelpgenXXXXXXX', TMPDIR => 1);

# Print the header
open (LATEX_FILE, $dirprefix . "Latex_Header.tex");
print <LATEX_FILE>;

while (my $token = $p->get_token())
{
    my $type = $token->[0];
    if ($type eq 'S') {
	my $tag = $token->[1];
	my $attr = $token->[2];
	if ($tag eq 'section') {
	    my $title = $attr->{'name'};
	    print "\\section{$title}\n\n";
	}

	if ($tag eq 'subsection') {
	    my $title = $attr->{'name'};
	    print "\\subsection{$title}\n\n";
	}

	if ($tag eq 'subsubsection') {
	    my $title = $attr->{'name'};
	    print "\\subsubsection{$title}\n\n";
	}

	if ($tag eq 'file') {
	    my $file = $attr->{'name'};
	    open (LATEX_FILE, $dirprefix . $file);
	    print <LATEX_FILE>;
	    print "\n\n";
	}

	if ($tag eq 'tex') {
	    print "\n\n";
	    print $attr->{'content'};
	    print "\n\n";
	}

	if ($tag eq 'pod') {
	    my $file = $attr->{'file'};
	    my $section = $attr->{'section'};
	    if (!defined($section)) { $section = ''; }
	    else { 
		$section = "-section $section";
		# Escape the pipes so they are considered ORs in the
		# RE for podselect's "section" option, and not 
		# pipes by the shell:
		$section =~ s/\|/\\\|/g;
	    }
	    $file = '../../loncom/' . $file;
	    my $tempfile = 't' . substr($file, rindex($file, '/') + 1);
	    system ("cp $file $tmpdir");
	    # The "echo" command is necessary; pod2latex can't
	    # handle a perl file that *starts* with pod.
	    system ("echo > $tmpdir/$tempfile; cat $file | podselect $section >> $tmpdir/$tempfile; cd $tmpdir; pod2latex -h1level 2 $tempfile");
	    my $latexFile = substr($tempfile, 0, rindex($tempfile, '.')) . '.tex';
	    open LATEX_FILE, $tmpdir . '/' . $latexFile;
	    # pod2latex inserts \labels and \indexs for every section,
	    # which is horrible because the section names tend to get
	    # reused a lot. This filters those out, so we need to do
	    # create our own indexes.
	    for (<LATEX_FILE>) {
		$_ =~ s/\\([^{]*)section(\*?)\{([^\\]+)\\label\{[^\\]+\}\\index\{([^\\]+)\}\}/\\\1section\2\{\3\}/g;
		print $_;
	    }
	    print "\n\n";
	}
    }
}

# Print out the footer.
open (LATEX_FILE, $dirprefix . "Latex_Footer.tex");
print <LATEX_FILE>;

# Remove the temp directory
system ("rm -rf $tmpdir");
