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#! /usr/bin/perl -w

# This is the xdvi wrapper script for Debian, based on Thomas Esser's
# teTeX version 0.2.
# Debian version: Copyright Julian Gilbey, 2002.  Lots of modifications
# by Chung-chieh Shan <ken@digitas.harvard.edu>.
# Also by TSUCHIYA Masatoshi <tsuchiya@pine.kuee.kyoto-u.ac.jp>.
# Original version: Copyright Thomas Esser, 1998.
# Permission to distribute this software is given under the terms of
# the GNU general public license version 2 or later.

# Thomas writes:
# This script sets some environment variables to make sure that xdvi's
# resource file in $XDVIINPUTS/xdvi is read by xdvi.bin.
# Special care was taken to make this work for old R3, too. Therefore,
# we need to modify XAPPLRESDIR. If you are running R4 or later, you
# can set XUSERFILESEARCHPATH for user specific application default
# files. You cannot use XAPPLRESDIR for user specific application default
# files.

# Julian writes: 
# This has been rewritten in Perl so that we can mangle the arguments
# to handled gzipped dvi files, which not have errors if there are
# spaces in some arguments. XAPPLRESDIR is no longer modified.

# Stephen Gildea writes:
# Debian distributes X11R6, therefore this script should not clobber
# XAPPLRESDIR, which is for user customizations.

use strict;
use FileHandle;
use File::Basename;
use File::Spec;
use File::Temp qw/ tempfile /;

my @NAMEOPT;
if (@ARGV == 1 and ($ARGV[0] eq '-help' or $ARGV[0] eq '-version')) {
    @NAMEOPT=();
} else {
    @NAMEOPT=qw(-name xdvi);
}

$ENV{'XDVIINPUTS'} .= ":\$TEXMF/{xdvi,web2c}";

my ($xdviappfile, $xdviappdir, $xdviapppath);
$xdviappfile=`kpsewhich -progname=xdvi --format='other text files' XDvi`;
if ("$xdviappfile" ne '') {
    $xdviappdir=dirname($xdviappfile);
    $xdviapppath="$xdviappdir/%N";

    if (exists $ENV{'XFILESEARCHPATH'}) {
	$ENV{'XFILESEARCHPATH'} = "$xdviapppath:$ENV{'XFILESEARCHPATH'}";
    } else {
	$ENV{'XFILESEARCHPATH'} = "$xdviapppath:%D";
    }
}

my $status;
if (@ARGV) {
    my $filename = pop @ARGV;

    if ($filename =~ /\.(gz|Z|bz2)$/) {
	my @command = $1 eq 'bz2' ? qw(bzip2 -d -c) : qw(gzip -d -c);

	require Fcntl;
	my $fh = tempfile( UNLINK => 1 )
	    or die "xdvi: cannot create temporary file: $!\n";
	fcntl $fh, Fcntl::F_SETFD(), 0
	    or die "xdvi: disabling close-on-exec for temporary file: $!\n";

	if (my $child = fork) {
	    1 while wait != $child;
	    if ($? & 255) {
		die "xdvi: $command[0] terminated abnormally: $?\n";
	    } elsif ($?) {
		my $code = $? >> 8;
		die "xdvi: $command[0] terminated with exit code $code\n";
	    }
	} elsif (defined $child) {
	    STDOUT->fdopen( $fh, "w" );
	    exec @command, $filename;
	} else {
	    die "xdvi: fork: $!\n";
	}
	$status = system('xdvi.bin', @NAMEOPT, @ARGV, '/dev/fd/'.fileno($fh));
    } else {
	$status = system('xdvi.bin', @NAMEOPT, @ARGV, $filename);
    }
} else {
    $status = system('xdvi.bin', @NAMEOPT);
}

if ($status & 255) {
    die "xdvi: xdvi.bin terminated abnormally: $?\n";
} else {
    my $code = $? >> 8;
    exit $code;
}