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#!/usr/bin/env perl
# $Id: tlpdb2list 5188 2007-10-14 20:32:44Z karl $
# Copyright 2007 Karl Berry.
# This file is licensed under the GNU General Public License version 2
# or any later version.
# 
# Update the map files in updmap.cfg from tlpdb -- a convenience, since
# the only other way to enable new maps is to do an install.  (updmap
# --syncwithtrees disables old maps, but does not enable new.)

BEGIN {
  $^W = 1;
  ($mydir = $0) =~ s,/[^/]*$,,;
  unshift (@INC, "$mydir/..");
}

use strict;

use TeXLive::TLConfig;
use TeXLive::TLPOBJ;
use TeXLive::TLPDB;
use Getopt::Long;
use Pod::Usage;
use File::Path;

our $NEW_UPDMAP_CFG;

our $mydir;
our $opt_debug = 0;
my $help = 0;

GetOptions("debug!", "help|?" => \$help) or pod2usage(1);

pod2usage(-exitstatus => 0, -verbose => 2) if $help;

exit (&main ());

sub main
{
  # get the db.
  chomp (my $Master = `cd $mydir/../.. && pwd`);  # xx TLPDB should default
  my $tlpdb = TeXLive::TLPDB->new ("root" => "$Master");

  # get list of packages.
  my %maps;
  for my $pkg ($tlpdb->list_packages) {
    my $obj = $tlpdb->get_package ($pkg);
    die "$0: no TeX Live package named $pkg in $Master.\n" if ! $obj;
    
    # record any maps.
    my @executes = $obj->executes;
    for (my $e = 0; $e < @executes; $e++) {
      my ($action,$value) = split (" ", $executes[$e]);
      if ($action =~ /add.*Map/) {
        $maps{$action} .= " " if exists $maps{$action};
        $maps{$action} .= $value;
      }
    }
  }
  
  return &update_updmap_cfg ($Master, %maps);
}



# update updmap.cfg per MAPS.
# 
sub update_updmap_cfg
{
  my ($Master, %maps) = @_;
  
  # read old file.
  my $UPDMAP_CFG = "$Master/texmf/web2c/updmap.cfg";
  my @updmap = `cat $UPDMAP_CFG`;

  # find last comment line (which is where the maps start).
  my $last_comment;
  for ($last_comment = $#updmap; $last_comment >= 0; $last_comment--) {
    last if $updmap[$last_comment] =~ /^#/;
  }
  die "no last comment in $UPDMAP_CFG?!" if $last_comment < 0;

  # write new file.
  local *NEW_UPDMAP_CFG;
  my $new_updmap_cfg = "$UPDMAP_CFG.new";  # just the filename
  $NEW_UPDMAP_CFG = ">$new_updmap_cfg";    # for open
  open (NEW_UPDMAP_CFG) || die "open($NEW_UPDMAP_CFG) failed: $!";

  # first copy everything up to and including the last comment.
  for (my $i = 0; $i <= $last_comment; $i++) {
    print NEW_UPDMAP_CFG $updmap[$i];
  }
  
  # add our map lines, preserving alphabetical order.
  for my $action (sort keys %maps) {
    my @maps = split (/ /, $maps{$action});
    (my $key = $action) =~ s/^add//;  # addMap in tlp, Map in updmap.cfg
    @maps = map { "$key $_\n" } sort @maps;
    print NEW_UPDMAP_CFG @maps;
  }
  close (NEW_UPDMAP_CFG) || warn "close($NEW_UPDMAP_CFG) failed: $!";

  # show differences.
  print `diff $UPDMAP_CFG $new_updmap_cfg`;
  my $ret = $? / 8;
  if ($ret == 0) {
    unlink ($new_updmap_cfg) || die "unlink($new_updmap_cfg) failed: $!";
  }

  return $ret;
}

__END__

=head1 NAME

tlpdb2updmap - update updmap.cfg from a TeX Live database

=head1 SYNOPSIS

tlpdb2updmap [OPTION]... 

=head1 OPTIONS

The standard options C<-help> and C<-debug> are accepted.
See the tlpfiles documentation for details.

=head1 DESCRIPTION

B<tlpdb2updmap> creates an updated C<updmap.cfg> file in a TL tree with
the C<Map> and C<MixedMap> entries in the TL database.  

C<updmap.cfg> is assumed to be found in
C<Master/texmf/web2c/updmap.cfg>, where C<Master/> is C<../..> of
C<$0>.

The new file is written to C<updmap.cfg.new> in that same directory, if
there are any changes.  A diff is also shown, and the exit status is one.

Exit status is zero if no differences.

No repository actions are performed in any case.

=head1 AUTHORS AND COPYRIGHT

This script and its documentation were written for the TeX Live
distribution (L<http://tug.org/texlive>) and both are licensed under the
GNU General Public License Version 2 or later.

=cut

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