#!/usr/bin/perl -w
#
#	pdfmom		: Frontend to run groff -mom to produce PDFs
#	Deri James	: Friday 16 Mar 2012
#

# Copyright (C) 2012-2018 Free Software Foundation, Inc.
#      Written by Deri James <deri@chuzzlewit.demon.co.uk>
#
# This file is part of groff.
#
# groff 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 3 of the License, or
# (at your option) any later version.
#
# groff 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 this program.  If not, see <http://www.gnu.org/licenses/>.

use strict;
use File::Temp qw/tempfile/;
my @cmd;
my $dev='pdf';
my $preconv='';
my $readstdin=1;
my $RT_SEP=':';

$ENV{PATH}=$ENV{GROFF_BIN_PATH}.$RT_SEP.$ENV{PATH} if exists($ENV{GROFF_BIN_PATH});
$ENV{TMPDIR}=$ENV{GROFF_TMPDIR} if exists($ENV{GROFF_TMPDIR});

while (my $c=shift)
{
    $c=~s/(?<!\\)"/\\"/g;
    
    if (substr($c,0,2) eq '-T')
    {
	if (length($c) > 2)
	{
	    $dev=substr($c,2);
	}
	else
	{
	    $dev=shift;
	}
	next;
    }
    elsif (substr($c,0,2) eq '-K')
    {
	if (length($c) > 2)
	{
	    $preconv=$c;
	}
	else
	{
	    $preconv=$c;
	    $preconv.=shift;
	}
	next;
    }
    elsif (substr($c,0,2) eq '-k')
    {
	$preconv=$c;
	next;
    }
    elsif ($c eq '-z' or $c eq '-Z')
    {
	$dev=$c;
	next;
    }
    elsif ($c eq '-v')
    {
	print "GNU pdfmom (groff) version 1.22.4\n";
	exit;
    }
    elsif (substr($c,0,1) eq '-')
    {
	if (length($c) > 1)
	{
	    push(@cmd,"\"$c\"");
	    push(@cmd,"'".(shift)."'") if length($c)==2 and index('dDfFIKLmMnoPrwW',substr($c,-1)) >= 0;
	}
	else
	{
	    # Just a '-'
	    
	    push(@cmd,$c);
	    $readstdin=2;
	}
    }
    else
    {
	# Got a filename?
	
	push(@cmd,"\"$c\"");
	$readstdin=0 if $readstdin == 1;
	
    }

}

my $cmdstring=' '.join(' ',@cmd).' ';

if ($readstdin)
{
    my ($fh,$tmpfn)=tempfile('pdfmom-XXXXX', UNLINK=>1);

    while (<STDIN>)
    {
	print $fh ($_);
    }
    
    close($fh);
    
    $cmdstring=~s/ - / $tmpfn / if $readstdin == 2;
    $cmdstring.=" $tmpfn " if $readstdin == 1;
}

if ($dev eq 'pdf')
{
    system("groff -Tpdf -dLABEL.REFS=1 -mom -z $cmdstring 2>&1 | LC_ALL=C grep '^\\. *ds' | groff -Tpdf -dPDF.EXPORT=1 -dLABEL.REFS=1 -mom -z - $cmdstring 2>&1 | LC_ALL=C grep '^\\. *ds' | groff -Tpdf -mom $preconv - $cmdstring");
}
elsif ($dev eq 'ps')
{
    system("groff -Tpdf -dLABEL.REFS=1 -mom -z $cmdstring 2>&1 | LC_ALL=C grep '^\\. *ds' | pdfroff -mpdfmark -mom --no-toc - $preconv $cmdstring");
}
elsif ($dev eq '-z') # pseudo dev - just compile for warnings
{
    system("groff -Tpdf -mom -z $cmdstring");
}
elsif ($dev eq '-Z') # pseudo dev - produce troff output
{
    system("groff -Tpdf -mom -Z $cmdstring");
}
else
{
    print STDERR "Not compatible with device '-T $dev'\n";
    exit 1;
}