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#!/usr/bin/env perl
# Copyright 2008, 2009 Norbert Preining
# This file is licensed under the GNU General Public License version 2
# or any later version.
#
# compare two tlpdbs
#

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

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

my @ignored_packs = qw/00texlive.installer 00texlive.image/;

our ($mydir, $vc_id);
my $opt_version = 0;
my $opt_help = 0;

TeXLive::TLUtils::process_logging_options();
GetOptions(
  "version"	=> \$opt_version,
  "help|?"      => \$opt_help) or pod2usage(1);

pod2usage("-exitstatus" => 0, "-verbose" => 2) if $opt_help;
if ($opt_version) { print "$vc_id\n"; exit 0; } 

exit (&main());


sub main
{
  chomp(my $Master = `cd $mydir/../.. && pwd`);
  #
  # if tl-compare-tlpdbs was called with two arguments like
  #   tl-compare-tlpdbs aaa bbb
  # then aaa and bbb are assumed to be two .tlpdb files.
  # if it was called with one argument only then this one is the tlpdb
  # to be compared with the "self-defined" (i.e., the one in 
  # $Master/tlpkg/texlive.tlpdb) one, where the "self-defined" is the
  # first one, and the to be compared the second one

  my $tlpdbAsrc;
  my $tlpdbBsrc;

  if ($#ARGV < 0) {
    tlwarn("$0 expects either one or two arguments, exiting.\n");
    exit 1;
  }

  if ($#ARGV == 0) {
    # one argument
    $tlpdbBsrc = $ARGV[0];
    $tlpdbAsrc = "$Master/tlpkg/texlive.tlpdb";
  } elsif ($#ARGV == 1) {
    $tlpdbAsrc = $ARGV[0];
    $tlpdbBsrc = $ARGV[1];
  } else {
    tlwarn("$0 expects either one or two arguments, exiting.\n");
    exit 1;
  }

  if (! -r $tlpdbAsrc) {
    tlwarn("$0: not readable $tlpdbAsrc, exiting.\n");
    exit 1;
  }
  if (! -r $tlpdbBsrc) {
    tlwarn("$0: not readable $tlpdbBsrc, exiting.\n");
    exit 1;
  }

  my $tlpdbA = TeXLive::TLPDB->new();
  my $tlpdbB = TeXLive::TLPDB->new();
  $tlpdbA->from_file($tlpdbAsrc);
  $tlpdbB->from_file($tlpdbBsrc);

  my @inAnotinB;
  my @inBnotinA;
  my @revision_differ;

  my %do_compare;
  my %filedifferrors;

  for my $p ($tlpdbA->list_packages()) {
    next if TeXLive::TLUtils::member($p, @ignored_packs);
    my $tlpB = $tlpdbB->get_package($p);
    if (!defined($tlpB)) {
      push @inAnotinB, $p;
    } else {
      $do_compare{$p} = 1;
    }
  }
  for my $p ($tlpdbB->list_packages()) {
    next if TeXLive::TLUtils::member($p, @ignored_packs);
    my $tlpA = $tlpdbA->get_package($p);
    if (!defined($tlpA)) {
      push @inBnotinA, $p;
    } else {
      $do_compare{$p} = 1;
    }
  }
  for my $p (sort keys %do_compare) {
    my $tlpA = $tlpdbA->get_package($p);
    my $tlpB = $tlpdbB->get_package($p);
    my $rA = $tlpA->revision;
    my $rB = $tlpB->revision;
    if ($rA != $rB) {
      push @revision_differ, "$p rev differ: revision left $rA, revision right $rB\n";
    } else {
      if ($tlpA->relocated) {
        $tlpA->cancel_reloc_prefix;
      }
      if ($tlpB->relocated) {
        $tlpB->cancel_reloc_prefix;
      }
      my @fA = $tlpA->all_files;
      my @fB = $tlpB->all_files;
      my @ret = compare_lists(\@fA, \@fB);
      push @{$filedifferrors{$p}}, @ret if @ret;
    }
  }

  my $ret = 0;

  if (@revision_differ) {
    $ret = 1;
    print "packages with revision discrepancy:\n";
    for my $p (@revision_differ) {
      print "$p";
    }
  }
  if (@inAnotinB) {
    $ret = 1;
    print "packages which occur in the left tlpdb but not in the right:\n";
    for my $p (@inAnotinB) {
      print "$p\n";
    }
  }
  if (@inBnotinA) {
    $ret = 1;
    print "packages which occur in the right tlpdb but not in the left:\n";
    for my $p (@inBnotinA) {
      print "$p\n";
    }
  }
  for my $pkg (keys %filedifferrors) {
    $ret = 1;
    print "file differences in $pkg:\n";
    for my $l (@{$filedifferrors{$pkg}}) {
      print "  $l\n";
    }
  }
  return($ret);
}


sub compare_lists {
  my ($la, $lb) = @_;
  my @la = @$la;
  my @lb = @$lb;
  my %onlyfirst;
  my %onlysecond;
  my @ret;
  for my $f (@la) { $onlyfirst{$f} = 1; }
  for my $f (@lb) { delete($onlyfirst{$f}); $onlysecond{$f} = 1; }
  for my $f (@la) { delete($onlysecond{$f}); }
  for my $f (sort keys %onlyfirst) { push @ret, "-$f"; }
  for my $f (sort keys %onlysecond) { push @ret, "+$f"; }
  return(@ret);
}

__END__

=head1 NAME

tl-compare-tlpdbs - compare two tlpdbs

=head1 SYNOPSIS

tl-compare-tlpdbs [I<option>]... <TLPDB1> [<TLPDB2>]

=head1 OPTIONS

=over 4

=item B<-help>

Print this documentation and exit.

=back

The standard options B<-q>, B<-v>, and B<-logfile>=I<file> are also
accepted; see the C<process_logging_options> function in
L<TeXLive::TLUtils> for details.

=head1 DESCRIPTION

This program compares two tlpdbs. If two arguments are given both
have to refer to a .tlpdb file and the two tlpdbs will be compared.
If only one argument is given then the tlpdb from the tree of this
program itself is compared with the tlpdb given on the command line.

The comparision reports revision differences, and if the revision are
the same, differences in the file lists.

=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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