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-#! /usr/bin/env perl
-
-###########################################################
-# Prepare a LaTeX run for two-way communication with Perl #
-# By Scott Pakin <scott+pt@pakin.org> #
-###########################################################
-
-#-------------------------------------------------------------------
-# This is file `perltex.pl',
-# generated with the docstrip utility.
-#
-# The original source files were:
-#
-# perltex.dtx (with options: `perltex')
-#
-# This is a generated file.
-#
-# Copyright (C) 2004 by Scott Pakin <scott+pt@pakin.org>
-#
-# This file may be distributed and/or modified under the conditions
-# of the LaTeX Project Public License, either version 1.2 of this
-# license or (at your option) any later version. The latest
-# version of this license is in:
-#
-# http://www.latex-project.org/lppl.txt
-#
-# and version 1.2 or later is part of all distributions of LaTeX
-# version 1999/12/01 or later.
-#-------------------------------------------------------------------
-
-use Safe;
-use Opcode;
-use Getopt::Long;
-use Pod::Usage;
-use File::Basename;
-use POSIX;
-use warnings;
-use strict;
-my $latexprog;
-my $runsafely = 1;
-my @permittedops;
-my $progname = basename $0;
-my $jobname = "texput";
-my @latexcmdline;
-my $toperl;
-my $fromperl;
-my $toflag;
-my $fromflag;
-my $doneflag;
-my $logfile;
-my $sandbox = new Safe;
-my $latexpid;
-$latexprog = $ENV{"PERLTEX"} || "latex";
-Getopt::Long::Configure("require_order", "pass_through");
-GetOptions("help" => sub {pod2usage(-verbose => 1)},
- "latex=s" => \$latexprog,
- "safe!" => \$runsafely,
- "permit=s" => \@permittedops) || pod2usage(2);
-@latexcmdline = @ARGV;
-my $firstcmd = 0;
-for ($firstcmd=0; $firstcmd<=$#latexcmdline; $firstcmd++) {
- my $option = $latexcmdline[$firstcmd];
- next if substr($option, 0, 1) eq "-";
- if (substr ($option, 0, 1) ne "\\") {
- $jobname = basename $option, ".tex" ;
- $latexcmdline[$firstcmd] = "\\input $option";
- }
- last;
-}
-push @latexcmdline, "" if $#latexcmdline==-1;
-my $separator = "";
-foreach (1 .. 20) {
- $separator .= chr(ord("A") + rand(26));
-}
-$toperl = $jobname . ".topl";
-$fromperl = $jobname . ".frpl";
-$toflag = $jobname . ".tfpl";
-$fromflag = $jobname . ".ffpl";
-$doneflag = $jobname . ".dfpl";
-$logfile = $jobname . ".lgpl";
-$latexcmdline[$firstcmd] =
- sprintf '\makeatletter' . '\def%s{%s}' x 6 . '\makeatother%s',
- '\plmac@tag', $separator,
- '\plmac@tofile', $toperl,
- '\plmac@fromfile', $fromperl,
- '\plmac@toflag', $toflag,
- '\plmac@fromflag', $fromflag,
- '\plmac@doneflag', $doneflag,
- $latexcmdline[$firstcmd];
-foreach my $file ($toperl, $fromperl, $toflag, $fromflag, $doneflag) {
- unlink $file while -e $file;
-}
-open (LOGFILE, ">$logfile") || die "open(\"$logfile\"): $!\n";
-defined ($latexpid = fork) || die "fork: $!\n";
-unshift @latexcmdline, $latexprog;
-if (!$latexpid) {
- exec {$latexcmdline[0]} @latexcmdline;
- die "exec('@latexcmdline'): $!\n";
-}
-@permittedops=(":browse") if $#permittedops==-1;
-@permittedops=(Opcode::full_opset()) if !$runsafely;
-$sandbox->permit_only (@permittedops);
-while (1) {
- my $awaitexists = sub {
- while (!-e $_[0]) {
- sleep 0;
- if (waitpid($latexpid, &WNOHANG)==-1) {
- foreach my $file ($toperl, $fromperl, $toflag,
- $fromflag, $doneflag) {
- unlink $file while -e $file;
- }
- undef $latexpid;
- exit 0;
- }
- }
- };
- $awaitexists->($toflag);
- my $entirefile;
- {
- local $/ = undef;
- open (TOPERL, "<$toperl") || die "open($toperl): $!\n";
- $entirefile = <TOPERL>;
- close TOPERL;
- }
- my ($optag, $macroname, @otherstuff) =
- map {chomp; $_} split "$separator\n", $entirefile;
- $macroname =~ s/^[^A-Za-z]+//;
- $macroname =~ s/\W/_/g;
- $macroname = "latex_" . $macroname;
- if ($optag eq "USE") {
- foreach (@otherstuff) {
- s/\\/\\\\/g;
- s/\'/\\\'/g;
- $_ = "'$_'";
- }
- }
- my $perlcode;
- if ($optag eq "DEF") {
- $perlcode =
- sprintf "sub %s {%s}\n",
- $macroname, $otherstuff[0];
- }
- else {
- $perlcode = sprintf "%s (%s);\n", $macroname, join(", ", @otherstuff);
- }
- print LOGFILE "#" x 31, " PERL CODE ", "#" x 32, "\n";
- print LOGFILE $perlcode, "\n";
- undef $_;
- my $result;
- {
- my $warningmsg;
- local $SIG{__WARN__} =
- sub {chomp ($warningmsg=$_[0]); return 0};
- $result = $sandbox->reval ($perlcode);
- if (defined $warningmsg) {
- $warningmsg =~ s/at \(eval \d+\) line \d+\W+//;
- print LOGFILE "# ===> $warningmsg\n\n";
- }
- }
- $result="" if !$result;
- if ($@) {
- my $msg = $@;
- $msg =~ s/at \(eval \d+\) line \d+\W+//;
- $msg =~ s/\s+/ /;
- $result = "\\PackageError{perltex}{$msg}";
- my @helpstring;
- if ($msg =~ /\btrapped by\b/) {
- @helpstring =
- ("The preceding error message comes from Perl. Apparently,",
- "the Perl code you tried to execute attempted to perform an",
- "`unsafe' operation. If you trust the Perl code (e.g., if",
- "you wrote it) then you can invoke perltex with the --nosafe",
- "option to allow arbitrary Perl code to execute.",
- "Alternatively, you can selectively enable Perl features",
- "using perltex's --permit option. Don't do this if you don't",
- "trust the Perl code, however; malicious Perl code can do a",
- "world of harm to your computer system.");
- }
- else {
- @helpstring =
- ("The preceding error message comes from Perl. Apparently,",
- "there's a bug in your Perl code. You'll need to sort that",
- "out in your document and re-run perltex.");
- }
- my $helpstring = join ("\\MessageBreak\n", @helpstring);
- $helpstring =~ s/\. /.\\space\\space /g;
- $result .= "{$helpstring}";
- }
- print LOGFILE "%" x 30, " LATEX RESULT ", "%" x 30, "\n";
- print LOGFILE $result, "\n\n";
- $result .= '\endinput';
- open (FROMPERL, ">$fromperl") || die "open($fromperl): $!\n";
- syswrite FROMPERL, $result;
- close FROMPERL;
- unlink $toflag while -e $toflag;
- unlink $toperl while -e $toperl;
- unlink $doneflag while -e $doneflag;
- open (FROMFLAG, ">$fromflag") || die "open($fromflag): $!\n";
- close FROMFLAG;
- $awaitexists->($toperl);
- unlink $fromflag while -e $fromflag;
- open (DONEFLAG, ">$doneflag") || die "open($doneflag): $!\n";
- close DONEFLAG;
-}
-END {
- close LOGFILE;
- if (defined $latexpid) {
- kill (9, $latexpid);
- exit 1;
- }
- exit 0;
-}
-
-__END__
-
-=head1 NAME
-
-perltex - enable LaTeX macros to be defined in terms of Perl code
-
-=head1 SYNOPSIS
-
-perltex
-[B<--help>]
-[B<--latex>=I<program>]
-[B<-->[B<no>]B<safe>]
-[B<--permit>=I<feature>]
-[I<latex options>]
-
-=head1 DESCRIPTION
-
-LaTeX -- through the underlying TeX typesetting system -- produces
-beautifully typeset documents but has a macro language that is
-difficult to program. In particular, support for complex string
-manipulation is largely lacking. Perl is a popular general-purpose
-programming language whose forte is string manipulation. However, it
-has no typesetting capabilities whatsoever.
-
-Clearly, Perl's programmability could complement LaTeX's typesetting
-strengths. B<perltex> is the tool that enables a symbiosis between
-the two systems. All a user needs to do is compile a LaTeX document
-using B<perltex> instead of B<latex>. (B<perltex> is actually a
-wrapper for B<latex>, so no B<latex> functionality is lost.) If the
-document includes a C<\usepackage{perltex}> in its preamble, then
-C<\perlnewcommand> and C<\perlrenewcommand> macros will be made
-available. These behave just like LaTeX's C<\newcommand> and
-C<\renewcommand> except that the macro body contains Perl code instead
-of LaTeX code.
-
-=head1 OPTIONS
-
-B<perltex> accepts the following command-line options:
-
-=over 4
-
-=item B<--help>
-
-Display basic usage information.
-
-=item B<--latex>=I<program>
-
-Specify a program to use instead of B<latex>. For example,
-C<--latex=pdflatex> would typeset the given document using
-B<pdflatex> instead of ordinary B<latex>.
-
-=item B<-->[B<no>]B<safe>
-
-Enable or disable sandboxing. With the default of C<--safe>,
-B<perltex> executes the code from a C<\perlnewcommand> or
-C<\perlrenewcommand> macro within a protected environment that
-prohibits ``unsafe'' operations such as accessing files or executing
-external programs. Specifying C<--nosafe> gives the LaTeX document
-I<carte blanche> to execute any arbitrary Perl code, including that
-which can harm the user's files. See L<Safe> for more information.
-
-=item B<--permit>=I<feature>
-
-Permit particular Perl operations to be performed. The C<--permit>
-option, which can be specified more than once on the command line,
-enables finer-grained control over the B<perltex> sandbox. See
-L<Opcode> for more information.
-
-=back
-
-These options are then followed by whatever options are normally
-passed to B<latex> (or whatever program was specified with
-C<--latex>), including, for instance, the name of the F<.tex> file to
-compile.
-
-=head1 EXAMPLES
-
-In its simplest form, B<perltex> is run just like B<latex>:
-
- perltex myfile.tex
-
-To use B<pdflatex> instead of regular B<latex>, use the C<--latex>
-option:
-
- perltex --latex=pdflatex myfile.tex
-
-If LaTeX gives a ``C<trapped by operation mask>'' error and you trust
-the F<.tex> file you're trying to compile not to execute malicious
-Perl code (e.g., because you wrote it yourself), you can disable
-B<perltex>'s safety mechansisms with C<--nosafe>:
-
- perltex --nosafe myfile.tex
-
-The following command gives documents only B<perltex>'s default
-permissions (C<:browse>) plus the ability to open files and invoke the
-C<time> command:
-
- perltex --permit=:browse --permit=:filesys_open
- --permit=time myfile.tex
-
-=head1 ENVIRONMENT
-
-B<perltex> honors the following environment variables:
-
-=over 4
-
-=item PERLTEX
-
-Specify the filename of the LaTeX compiler. The LaTeX compiler
-defaults to ``C<latex>''. The C<PERLTEX> environment variable
-overrides this default, and the C<--latex> command-line option (see
-L</OPTIONS>) overrides that.
-
-=back
-
-=head1 FILES
-
-While compiling F<jobname.tex>, B<perltex> makes use of the following
-files:
-
-=over 4
-
-=item F<jobname.lgpl>
-
-log file written by Perl; helpful for debugging Perl macros
-
-=item F<jobname.topl>
-
-information sent from LaTeX to Perl
-
-=item F<jobname.frpl>
-
-information sent from Perl to LaTeX
-
-=item F<jobname.tfpl>
-
-``flag'' file whose existence indicates that F<jobname.topl> contains
-valid data
-
-=item F<jobname.ffpl>
-
-``flag'' file whose existence indicates that F<jobname.frpl> contains
-valid data
-
-=item F<jobname.dfpl>
-
-``flag'' file whose existence indicates that F<jobname.ffpl> has been
-deleted
-
-=back
-
-=head1 NOTES
-
-B<perltex>'s sandbox defaults to what L<Opcode> calls ``C<:browse>''.
-
-=head1 SEE ALSO
-
-latex(1), pdflatex(1), perl(1), Safe(3pm), Opcode(3pm)
-
-=head1 AUTHOR
-
-Scott Pakin, I<scott+pt@pakin.org>
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-13 19:52:39 +0000