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#!/usr/bin/perl -w

=head1 NAME

debconf-getlang - extract a language from a templates file

=cut

use strict;
use Debconf::Template::Transient;
use Getopt::Long;

print STDERR "debconf-getlang: This utility is deprecated; you should switch to using the po-debconf package.\n";

=head1 SYNOPSIS

 debconf-getlang lang master [translation]
 debconf-getlang --stats master translation [...]

=head1 DESCRIPTION

Note: This utility is deprecated; you should switch to using the po-debconf package.

This program helps make and manage translations of debconf templates.
There are basically three situations in which this program might be called:

=over 4

=item A translation is just being started.

You want to provide the translator with a file they can work on that has the
English fields from your templates file, plus blank Field-ll fields for the
target language that they can fill in. 

To do this, run the program with first parameter being the code for the
language that is being translated to, and the second parameter being the
filename of the English templates file.

=item A translation is well under way.

You have changed some English text, or added more items to your templates
file, and you want to send the translators a file with the English text plus
their current translations (or you are the translator, and you want to
generate such a file for your own use).

To accomplish this, run the program with the first parameter being the the
code for the language that is being translated to, the second parameter
being the filename of the master English templates file, and the third
parameter being the filename of the current translated file.

When run this way, the program is smart enough to notice fuzzy
translations. For example a fuzzy Description will be output as
Description-<lang>-fuzzy, and a new, blank Description-<lang> will be added.
Translators should remove the -fuzzy fields as they correct the fuzzy
translations.

=item Checking the status of a translation

To check the status of a translation, use the --status flag, and pass 
the english template file as the first parameter, and all the other
translated templates after that. It will output statistics for each of
them. For example:

  debconf-getlang --stats debian/templates debian/templates.*

=back

=head1 NOTE

Note that the text in the generated templates may be word-wrapped by
debconf.

=head1 SEE ALSO

L<debconf-mergetemplate(1)>

=cut

sub usage {
	print STDERR <<EOF;
Usage:
  debconf-getlang lang master [translation]
  debconf-getlang --stats master translation [...]
EOF
	exit 1;
}

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

my $stats=0;
GetOptions(
	'stats|s' => \$stats,
) or usage;

if ($stats) {
	my $master=shift || usage;
	foreach my $fn (@ARGV) {
		my ($lang)=$fn=~m/\.([^.]+)$/;
		getlang($lang, $master, $fn);
	}
}
else {
	my $lang=shift || usage;
	my $fn=shift || usage;
	my $lfn=shift;
	getlang($lang, $fn, $lfn);
}

sub getlang {
	my $lang=lc(shift);
	my $fn=shift;
	my $lfn=shift;

	# First read in the master file.
	my %master;
	my @out;
	foreach my $in (Debconf::Template::Transient->load($fn)) {
		my $out=Debconf::Template::Transient->new($in->template);
		
		foreach my $field ($in->fields) {
			next if $field eq 'template';
			if ($field =~ m/-(..(_..)?)$/) {
				if ($1 eq $lang) {
					$out->$field($in->$field());
				}
				# Skip fields that are for some other language.
			}
			else {
				$out->$field($in->$field());
			}
		}
	
		$master{$out->template}=$out;
		push @out, $out;
	}
	
	# Now read in the localized file, if there is one.
	my %localized;
	if ($lfn) {
		foreach my $in (Debconf::Template::Transient->load($lfn)) {
			$localized{$in->template}=$in;
		}
	}
	
	# Now go merge together the master template and any corresponding
	# localized template. Determine which translations are good, and
	# which are fuzzy. Finally, stub in any fields that should exist
	# for the target language, but do not yet exist. This gets complex
	# because only some fields need to be translated, depending on
	# template type.
	
	my $good=0;
	my $fuzzy=0;
	my $bad=0;

	foreach my $master (@out) {
		my $localized=$localized{$master->template};
	
		# Work out what fields need to be translated.
		my @needfields=qw{description};
		if ($master->type !~ /^((multi)?select|note|error|boolean)$/) {
			push @needfields, 'default' if defined $master->default;
		}
		if ($master->type =~ /(multi)?select/) {
			push @needfields, 'choices';
		}
	
		# Merge in localized, including fuzzy translations.
		#
		# Note that extended_ fields are looked for, and if they exist,
		# compared along with the field they extend. That's what makes
		# the code ugly... it probably points out that Templates need
		# to handle extended values better, allowing either the short
		# part only, or the extended part only, or both, to be retreived
		# easily. TODO
		if ($localized) {
			foreach my $field (@needfields) {
				my $field_lang="$field-$lang";
				my $field_ext="extended_$field";
				my $field_lang_ext="extended_$field_lang";
		
				my $value=$master->$field;
				next unless defined $value;
				next unless defined $localized->$field_lang;
				$value.="\n".$master->$field_ext
					if defined $master->$field_ext;
				my $lvalue='';
				$lvalue=$localized->$field
					if defined $localized->$field;
				$lvalue.="\n".$localized->$field_ext
					if defined $localized->$field_ext;
	
				# Ignore leading/trailing whitespace,
				# and collapse other whitespace.
				$value=~s/^\s+//gm;
				$value=~s/\s+$//gm;
				$value=~tr/ \t\n/ /s;
				$lvalue=~s/^\s+//gm;
				$lvalue=~s/\s+$//gm;
				$lvalue=~tr/ \t\n/ /s;

				my $old="$field_lang-fuzzy";
				my $old_ext="extended_$old";
				if (defined $localized->$old && 
				    $localized->$field_lang eq "") {
					# Old fuzzy field exists, and no
					# translation has been updated, so
					# preserve as-is.
					$fuzzy++;
					$master->$old($localized->$old);
					$master->$old_ext($localized->$old_ext)
						if defined $localized->$old_ext;
					$master->$field_lang("");
				}
				elsif ($value eq $lvalue) {
					$good++;
					$master->$field_lang($localized->$field_lang);
					$master->$field_lang_ext($localized->$field_lang_ext)
						if defined $localized->$field_lang_ext;
				}
				else {
					$fuzzy++;
					$master->$old($localized->$field_lang);
					$master->$old_ext($localized->$field_lang_ext)
						if defined $localized->$field_lang_ext;
					$master->$field_lang("");
				}
			}
		}
		
		# Now make sure that at least stubs exist for every needed
		# translated field.
		foreach my $field (@needfields) {
			my $field_lang="$field-$lang";
			unless (defined $master->$field_lang) {
				$bad++;
				$master->$field_lang("");
			}
		}
	}
	
	if (! $stats) {
		print Debconf::Template::Transient->stringify(@out) unless $stats;
	}
	else {
		print "$lang: ".join(', ', grep { $_ ne "" } 
			$good  ? "$good translated strings"  : "",
			$fuzzy ? "$fuzzy fuzzy translations" : "",
			$bad   ? "$bad untranslated strings" : "",
		)."\n";
	}
}

=head1 AUTHOR

Joey Hess <joeyh@debian.org>

=cut