#!/usr/bin/perl -w
#
#   BuildFoundries   : Given a Foundry file generate groff and download files
#   Deri James       : Monday 07 Feb 2011

# Copyright (C) 2011 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;

my $where=shift||'';
my $devps=shift||'../devps';
chdir $where if $where ne '';
my (%foundry,%flg,@downloadpreamble,%download);
my $GSpath=FindGSpath();
my $warn=0;
my $lct=0;
my $foundry='';	# the default foundry

LoadDownload("download");
LoadFoundry("Foundry");
WriteDownload("download");

exit 0;



sub LoadFoundry
{
    my $fn=shift;
    my $foundrypath='';

    open(F,"<$fn") or die "No $fn file found";

    while (<F>)
    {
	chomp;
	$lct++;
	s/\r$//;	# in case edited in windows

	s/\s*#.*?$//;	# remove comments

	next if $_ eq '';

	if (m/^[A-Za-z]=/)
	{
	    my (@f)=split('=');
	    $flg{$f[0]}=$f[1];
	    next;
	}

	my (@r)=split('\|');

	if (lc($r[0]) eq 'foundry')
	{
	    $foundry=uc($r[1]);
	    $foundrypath=$r[2].' : '.$devps;
	    $foundrypath=~s/\(gs\)/$GSpath /;
	}
	else
	{
	    # 0=groff font name
	    # 1=IsBase Y/N (one of PDFs 14 base fonts)
	    # 2=afmtodit flag
	    # 3=map file
	    # 4=encoding file
	    # 5=font file
	    # 6=afm file

	    if (!defined($r[6]) or $r[6] eq '')
	    {
		# if no afm file, have a guess!
		$r[6]=substr($r[5],0,-3)."afm";
	    }

	    my $gfont=($foundry eq '')?$r[0]:"$foundry-$r[0]";

	    if ($r[2] eq '')
	    {
		# Don't run afmtodit, just copy the grops font file

		my $gotf=1;
		my $gropsfnt=LocateFile($devps,$r[0],0);

		if ($gropsfnt ne '' and -r "$gropsfnt")
		{
		    my $psfont=UseGropsVersion($gropsfnt);
		    if (!PutDownload($psfont,LocatePF($foundrypath,$r[5]),uc($r[1])))
		    {
			if (uc($r[1]) ne 'Y')
			{
			    $gotf=0;
			    my $fns=join(',',split('!',$r[5]));
			    Msg(0,"Unable to locate font(s) $fns on the given path(s)");
			    unlink $gfont;	# Unable to find the postscript file for the font just created by afmtodit
			}
		    }
		    print STDERR "Copied grops font $gfont...\n" if $gotf;

		}
		else
		{
		    Msg(0,"Can't read grops font '$r[0]' for Foundry '$foundry'");
		}
	    }
	    else
	    {
		# We need to run afmtodit to create this groff font
		my $psfont=RunAfmtodit($gfont,LocateAF($foundrypath,$r[6]),$r[2],$r[3],$r[4]);

		if ($psfont)
		{
		    if (!PutDownload($psfont,LocatePF($foundrypath,$r[5]),uc($r[1])))
		    {
			unlink $gfont;	# Unable to find the postscript file for the font just created by afmtodit
		    }
		    else
		    {
			print STDERR "Generated $gfont...\n";
		    }
		}
		else
		{
		    Msg(0,"Failed to create groff font '$gfont' by running afmtodit");
		}
	    }
	}
    }

    close();
}

sub RunAfmtodit
{
    my $gfont=shift;
    my $afmfile=shift;
    my $flags=shift;
    my $map=shift||'';
    my $enc=shift||'';
    my $psfont='';

    $enc="-e 'enc/$enc'" if $enc;
    $map="'map/$map'" if $map;

    my $cmd='afmtodit -c -dDESC';

    foreach my $f (split('',$flags))
    {
	if (!exists($flg{$f}))
	{
	    Msg(0,"Can't use undefined flag '$f' in calling afmtodit for groff font '$gfont'");
	    return('');
	}

	$cmd.=" $flg{$f}";
    }

    system("$cmd $enc '$afmfile' $map $gfont 2>/dev/null");

    if ($?)
    {
	unlink $gfont;
	return('');
    }

    if (open(GF,"<$gfont"))
    {
	my (@gf)=(<GF>);
	my @ps=grep(/^internalname /,@gf);
	if ($#ps == 0)	# Just 1 match
	{
	    (undef,$psfont)=split(' ',$ps[0],2);
	    chomp($psfont);
	}
	else
	{
	    Msg(0,"Unexpected format for grops font '$gfont' for Foundry '$foundry' - ignoring");
	}

	close(GF);
    }

    return($psfont);
}

sub LocateAF
{
    my $path=shift;
    my $file=shift;

    return(LocateFile($path,$file,1));
}

sub LocatePF
{
    my $path=shift;
    my $file=shift;

    return(LocateFile($path,$file,0));
}

sub LocateFile
{
    my $path=shift;
    my $files=shift;
    my $tryafm=shift;
    return(substr($files,1)) if substr($files,0,1) eq '*';

    foreach my $file (split('!',$files))
    {
    if ($file=~m'/')
    {
	# path given with file name so no need to search the paths

	if (-r $file)
	{
	    return($file);
	}

	if ($tryafm and $file=~s'type1/'afm/'i)
	{
	    if (-r "$file")
	    {
		return($file);
	    }
	}

	return('');
    }

	if ($path eq '(tex)')
    {
	my $res=`kpsewhich $file`;
	return '' if $?;
	chomp($res);
	return($res);
    }

	my (@paths)=split(/ (:|;)/,$path);

    foreach my $p (@paths)
    {
	    next if !defined($p) or $p eq ';' or $p eq ':';
	$p=~s/^\s+//;
	$p=~s/\s+$//;

	next if $p=~m/^\%rom\%/;	# exclude %rom% paths (from (gs))

	if (-r "$p/$file")
	{
	    return("$p/$file");
	}

	if ($tryafm and $p=~s'type1/'afm/'i)
	{
	    if (-r "$p/$file")
	    {
		return("$p/$file");
	    }
	}
    }
    }

    return('');
}

sub FindGSpath
{
    my (@res)=`gs -h 2>/dev/null`;
    return '' if $?;
    my $buildpath='';
    my $stg=1;

    foreach my $l (@res)
    {
	chomp($l);

	if ($stg==1 and $l=~m/^Search path:/)
	{
	    $stg=2;
	}
	elsif ($stg == 2)
	{
	    if (substr($l,0,1) ne ' ')
	    {
		$stg=3;
	    }
	    else
	    {
		$l=~s/^\s+//;
		$buildpath.=$l;
	    }
	}
    }

    return($buildpath);
}

sub UseGropsVersion
{
    my $gfont=shift;
    my $psfont='';
    my (@gfa)=split('/',$gfont);
    my $gfontbase=pop(@gfa);

    if (open(GF,"<$gfont"))
    {
	my (@gf)=(<GF>);
	my @ps=grep(/^internalname /,@gf);
	if ($#ps == 0)	# Just 1 match
	{
	    (undef,$psfont)=split(' ',$ps[0],2);
	    chomp($psfont);
	}
	else
	{
	    Msg(0,"Unexpected format for grops font '$gfont' for Foundry '$foundry' - ignoring");
	}

	close(GF);

	if ($psfont)
	{
	    if (open(GF,">$gfontbase"))
	    {
		local $"='';
		print GF "@gf";
		close(GF);
	    }
	    else
	    {
		$psfont='';
		Msg(0,"Failed to create new font '$gfont' for Foundry '$foundry'");
	    }
	}
	else
	{
	    Msg(0,"Failed to locate postscript internalname in grops font '$gfont' for Foundry '$foundry'");
	}

	close(GF);
    }
    else
    {
	Msg(0,"Failed to open grops font '$gfont' for Foundry '$foundry'");
    }

    return($psfont);
}

sub PutDownload
{
    my $psfont=shift;
    my $pffile=shift;
    my $IsBase14=shift;
    my $key="$foundry $psfont";

    delete($download{$key}), return 0 if ($pffile eq '');

    $pffile='*'.$pffile if $IsBase14 eq 'Y'; # This signals to gropdf to only edmbed if -e given
    $download{$key}=$pffile;

    return 1;
}

sub LoadDownload
{
    my $fn=shift;
    my $top=1;

    return if !open(F,"<$fn");

    while (<F>)
    {
	chomp;
	s/\r$//;	# in case edited in windows

	if ($top and substr($_,0,1) eq '#' or $_ eq '')
	{
	    # Preserve comments at top of download file

	    push(@downloadpreamble,$_);
	    next;
	}

	$top=0;
	s/\s*#.*?$//;	# remove comments

	next if $_ eq '';

	my (@r)=split(/\t+/);
	my $key=$r[1];
	$key="$r[0] $r[1]";
	$download{$key}=$r[2];
    }

    close(F);
}

sub WriteDownload
{
    my $fn=shift;
    my $top=1;

    open(F,">$fn") or die "Can't Create new file '$fn'";

    print F join("\n",@downloadpreamble),"\n";

    foreach my $k (sort keys %download)
    {
	my ($f,$ps)=split(/ /,$k);
	print F "$f\t$ps\t$download{$k}\n";
    }

    close(F);
}

sub Msg
{
    my $sev=shift;
    my $msg=shift;

    if ($sev)
    {
	print STDERR "Error: line $lct: $msg\n";
	exit 2;
    }
    else
    {
	print STDERR "Warning: line $lct: $msg\n";
	$warn=1;
    }
}