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#!/usr/bin/perl -w

=head1 NAME

debconf-mergetemplate - merge together multiple debconf template files

=cut

use strict;
use Debconf::Template::Transient;
use Debconf::Config;
use Debconf::Gettext;

print STDERR gettext("debconf-mergetemplate: This utility is deprecated. You should switch to using po-debconf's po2debconf program.")."\n";

=head1 SYNOPSIS

debconf-mergetemplate [options] [templates.ll ...] templates

=head1 DESCRIPTION

Note: This utility is deprecated. You should switch to using po-debconf's
po2debconf program.

This program is useful if you have multiple debconf templates files which
you want to merge together into one big file. All the specified files will
be read in, merged, and output to standard output.

This can be especially useful if you are dealing with translated template
files. In this case, you might have your main template file, plus several
other files provided by the translators. These files will have translated
fields in them, and maybe the translators left in the english versions of
the fields they translated, for their reference.

So, you want to merge together all the translated templates files
with your main templates file. Any fields that are unique to the translated
files need to be added in to the correct templates, but any fields they have
in common should be superseded by the fields in the main file (which might be
more up-to-date).

This program handles that case properly, just list each of the translated
templates files, and then your main templates file last.

=head1 OPTIONS

=over 4

=item --outdated

Merge in even outdated translations. The default is to drop them with a
warning message.

=item --drop-old-templates

If a translation has an entire template that is not in the master file (and
thus is probably an old template), drop that entire template.

=back

=head1 SEE ALSO

L<debconf-getlang(1)>

=cut

my $usage=gettext("Usage: debconf-mergetemplate [options] [templates.ll ...] templates");

my $outdated=0;
my $dropold=0;
Debconf::Config->getopt($usage.
gettext(qq{
        --outdated		Merge in even outdated translations.
	--drop-old-templates	Drop entire outdated templates.}),
       "outdated"		=> \$outdated,
       "drop-old-templates"	=> \$dropold,
);

if (! @ARGV) {
	die $usage."\n";
}

# Ignore the user's locale settings.
Debconf::Template::Transient->i18n(0);

sub is_fuzzy {
	my $a=defuzz(shift);
	my $b=shift;
}

sub defuzz {
	my $value=shift;
        # Ignore leading/trailing whitespace,
	# and collapse other whitespace.
	$value=~s/^\s+//gm;
	$value=~s/\s+$//gm;
	$value=~tr/ \t\n/ /s;
	return $value;
}

my %templates = map { $_->template => $_ } Debconf::Template::Transient->load(pop @ARGV);

foreach my $template (map { Debconf::Template::Transient->load($_) } @ARGV) {
	if (exists $templates{$template->template}) {
		my $master=$templates{$template->template};
		foreach my $field (grep { /.+-.+/ } $template->fields) {
			next if $field =~ /^extended_/;
			if ($field =~ /(.+?)-(.+)/) {
				my $basefield = $1;
				my $lang = $2;

# Get the english versions, including
				# extended field if any.
				my $t_val = $template->$basefield;
				my $m_val = $master->$basefield;

if (! defined $t_val) {
					if ($outdated) {
						warn "debconf-mergetemplate: ".$template->template." ".
						     sprintf(gettext("%s is missing"), $basefield)."\n";
					}
					else {
						warn "debconf-mergetemplate: ".$template->template." ".
						     sprintf(gettext("%s is missing; dropping %s"), $basefield,  $field)."\n";
						     next;
					}
				}

my $extbasefield = "extended_$basefield";
				$t_val .= "\n".$template->$extbasefield
					if defined $template->$extbasefield;
				$m_val .= "\n".$master->$extbasefield
					if defined $master->$extbasefield;

my ($df_t, $df_m) = (defuzz($t_val), defuzz($m_val));
				if ($df_t ne $df_m) {
					my $diff_p = 0;

$diff_p++
						while substr($t_val, 0, $diff_p) eq substr($m_val, 0, $diff_p);
					my $diff_t = "'".
						($diff_p ? '...' : '').defuzz(substr($t_val, $diff_p-1, 8))."' != '".
						($diff_p ? '...' : '').defuzz(substr($m_val, $diff_p-1, 8))."'";

if ($outdated) {
						warn "debconf-mergetemplate: ".$template->template." ".
						     sprintf(gettext("%s is fuzzy at byte %s: %s"),
							     $field, $diff_p, $diff_t)."\n";
					}
					else {
						warn "debconf-mergetemplate: ".$template->template." ".
						     sprintf(gettext("%s is fuzzy at byte %s: %s; dropping it"),
							     $field, $diff_p, $diff_t)."\n";
						next;
					}
				}
			}
			
			$master->$field($template->$field);
			# If the other template has no extended part of the field,
			# coply in nothing.
			$field="extended_$field";
			$master->$field($template->$field);
		}
	}
	else {
		if (! $dropold) {
			warn "debconf-mergetemplate: ".
			     sprintf(gettext("%s is outdated"), $template->template)."\n";
			$templates{$template->template}=$template;
		}
		else {
			warn "debconf-mergetemplate: ".
			     sprintf(gettext("%s is outdated; dropping whole template!"), $template->template)."\n";
		}
	}
}

print Debconf::Template::Transient->stringify(values %templates);

=head1 AUTHOR

Joey Hess <joeyh@debian.org>

=cut

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