#! /usr/bin/env perl
eval 'exec perl -S $0 ${1+"$@"}'
  if $running_under_some_shell;

# pod-updatepo -- update the PO translation of POD data.
#
# Copyright 2002-2023 by SPI, inc.
#
# This program is free software; you can redistribute it and/or modify it
# under the terms of GPL v2.0 or later (see COPYING).

=encoding UTF-8

=head1 NAME

po4a-updatepo - update the translation (in PO format) of documentation

=head1 SYNOPSIS

B<po4a-updatepo> B<-f> I<fmt> (B<-m> I<master.doc>)+ (B<-p> I<XX.po>)+

(I<XX.po> are the outputs, all others are inputs)

=head1 DESCRIPTION

The po4a (PO for anything) project goal is to ease translations (and more
interestingly, the maintenance of translations) using gettext tools on
areas where they were not expected like documentation.

The B<po4a-updatepo> script is in charge of updating PO files to make
them reflect the changes made to the original documentation file. For that,
it converts the documentation file to a POT file, and call L<msgmerge(1)>
on this new POT and on the provided PO files.

It is possible to give more than one PO file (if you want to update several
languages at once), and several documentation files (if you want to store
the translations of several documents in the same PO file).

If the master document has non-ASCII characters, this script will convert the PO files
to UTF-8 (if they weren't already), for a transparent handling of non-standard characters.

=head1 OPTIONS

=over 4

=item B<-f>, B<--format>

Format of the documentation you want to handle. Use the B<--help-format>
option to see the list of available formats.

=item B<-m>, B<--master>

File(s) containing the master document to translate.

=item B<-M>, B<--master-charset>

Charset of the files containing the document to translate. Note that all
files must have the same charset.

=item B<-p>, B<--po>

PO file(s) to update. If these files do not exist, they are created by
B<po4a-updatepo>.

=item B<-o>, B<--option>

Extra option(s) to pass to the format plugin. See the documentation of each
plugin for more information about the valid options and their meanings. For 
example, you could pass '-o tablecells' to the AsciiDoc parser, while the 
text parser would accept '-o tabs=split'.

=item B<--no-previous>

This option removes B<--previous> from the options passed to B<msgmerge>.
This helps supporting old versions of B<gettext> (before v0.16).

=item B<--previous>

This option adds B<--previous> to the options passed to B<msgmerge>.
It requires B<gettext> 0.16 or later, and is activated by default.

=item B<--msgmerge-opt> I<options>

Extra options for B<msgmerge>(1).

=item B<-h>, B<--help>

Show a short help message.

=item B<--help-format>

List the documentation formats understood by po4a.

=item B<-V>, B<--version>

Display the version of the script and exit.

=item B<-v>, B<--verbose>

Increase the verbosity of the program.

=item B<-d>, B<--debug>

Output some debugging information.

=item B<--porefs> I<type>[,B<wrap>|B<nowrap>]

Specify the reference format. Argument I<type> can be one of B<never>
to not produce any reference, B<file> to only specify the file
without the line number, B<counter> to replace line number by an
increasing counter, and B<full> to include complete references (default: full).

Argument can be followed by a comma and either B<wrap> or B<nowrap> keyword.
References are written by default on a single line.  The B<wrap> option wraps
references on several lines, to mimic B<gettext> tools (B<xgettext> and
B<msgmerge>).  This option will become the default in a future release, because
it is more sensible.  The B<nowrap> option is available so that users who want
to keep the old behavior can do so.

=item B<--wrap-po> B<no>|B<newlines>|I<number> (default: 76)

Specify how the po file should be wrapped. This gives the choice between either
files that are nicely wrapped but could lead to git conflicts, or files that are
easier to handle automatically, but harder to read for humans.

Historically, the gettext suite has reformatted the po files at the 77th column
for cosmetics. This option specifies the behavior of po4a. If set to a numerical
value, po4a will wrap the po file after this column and after newlines in the
content. If set to B<newlines>, po4a will only split the msgid and msgstr after
newlines in the content. If set to B<no>, po4a will not wrap the po file at all.
The wrapping of the reference comments is controlled by the B<--porefs> option.

Note that this option has no impact on how the msgid and msgstr are wrapped, i.e.
on how newlines are added to the content of these strings.

=item B<--msgid-bugs-address> I<email@address>

Set the report address for msgid bugs. By default, the created POT files
have no Report-Msgid-Bugs-To fields.

=item B<--copyright-holder> I<string>

Set the copyright holder in the POT header. The default value is
"Free Software Foundation, Inc."

=item B<--package-name> I<string>

Set the package name for the POT header. The default is "PACKAGE".

=item B<--package-version> I<string>

Set the package version for the POT header. The default is "VERSION".

=back

=head1 SEE ALSO

L<po4a-gettextize(1)>,
L<po4a-normalize(1)>,
L<po4a-translate(1)>,
L<po4a(7)>

=head1 AUTHORS

 Denis Barbier <barbier@linuxfr.org>
 Nicolas François <nicolas.francois@centraliens.net>
 Martin Quinson (mquinson#debian.org)

=head1 COPYRIGHT AND LICENSE

Copyright 2002-2023 by SPI, inc.

This program is free software; you may redistribute it and/or modify it
under the terms of GPL v2.0 or later (see the COPYING file).

=cut

use 5.16.0;
use strict;
use warnings;
use utf8;

use Getopt::Long qw(GetOptions);
use Locale::Po4a::Po;

use Locale::Po4a::Chooser;
use Locale::Po4a::TransTractor;
use Locale::Po4a::Common;

use Pod::Usage qw(pod2usage);

use File::Temp;
use File::Copy qw(copy);
use Config;

Locale::Po4a::Common::textdomain('po4a');

sub show_version {
    Locale::Po4a::Common::show_version("po4a-updatepo");
    exit 0;
}

# init commandline parser
Getopt::Long::config( 'bundling', 'no_getopt_compat', 'no_auto_abbrev' );

# Parse our options
my ( @masterfiles,      @pofiles );
my ( $help,             $help_fmt, $verbose, $debug, $format, @options );
my ( $copyright_holder, $msgid_bugs_address, $package_name, $package_version, $no_deprecation );
my $mastchar;
my $previous;
my $noprevious;
my $msgmerge_opt = "";
my $porefs       = "full";
my $wrappo;
GetOptions(
    'help|h'      => \$help,
    'help-format' => \$help_fmt,

    'master|m=s' => \@masterfiles,
    'po|p=s'     => \@pofiles,
    'format|f=s' => \$format,

    'master-charset|M=s' => \$mastchar,

    # undocumented option to silence the warning about po4a-updatepo being deprecated
    'no-deprecation' => \$no_deprecation,

    'option|o=s' => \@options,

    'no-previous'          => \$noprevious,
    'wrap-po=s'            => \$wrappo,
    'previous'             => \$previous,
    'msgmerge-opt=s'       => \$msgmerge_opt,
    'copyright-holder=s'   => \$copyright_holder,
    'msgid-bugs-address=s' => \$msgid_bugs_address,
    'package-name=s'       => \$package_name,
    'package-version=s'    => \$package_version,
    'porefs=s'             => \$porefs,

    'verbose|v' => \$verbose,
    'debug|d'   => \$debug,
    'version|V' => \&show_version
) or pod2usage();

$help     && pod2usage( -verbose => 1, -exitval => 0 );
$help_fmt && Locale::Po4a::Chooser::list(0);
pod2usage() if scalar @masterfiles < 1 || scalar @pofiles < 1;

$msgmerge_opt .= " --previous" unless $noprevious;
$msgmerge_opt .= " --add-location=file" if ( $porefs =~ m/^file/ );
$msgmerge_opt =~ s/^\s+//;

my %options = (
    "verbose"            => $verbose,
    "debug"              => $debug,
    "copyright-holder"   => $copyright_holder,
    "msgid-bugs-address" => $msgid_bugs_address,
    "package-name"       => $package_name,
    "package-version"    => $package_version,
    "porefs"             => $porefs,
    "wrap-po"            => $wrappo
);

foreach (@options) {
    if (m/^([^=]*)=(.*)$/) {
        $options{$1} = "$2";
    } else {
        $options{$_} = 1;
    }
}

unless ($no_deprecation) {
    print wrap_msg(
        gettext(
                "po4a-updatepo is deprecated. The unified po4a(1) program is more convenient and less error prone. "
              . "Once configured, `po4a --no-translations` can be used as a drop-in replacement to `po4a-updatepo`."
        )
    );
}

# parser
my $doc = Locale::Po4a::Chooser::new( $format, %options );

map { -e $_ || die wrap_msg( gettext("File %s does not exist."), $_ ) } @masterfiles;
map { die wrap_msg( gettext("po4a-updatepo can't take the input PO from stdin.") ) if $_ eq '-' && !-e '-' } @pofiles;

my ($pot_filename);
( undef, $pot_filename ) = File::Temp::tempfile(
    "po4a-updatepoXXXX",
    DIR    => File::Spec->tmpdir(),
    SUFFIX => ".pot",
    OPEN   => 0,
    UNLINK => 0
) or die wrap_msg( gettext("Cannot create a temporary POT file: %s"), $! );

print STDERR wrap_msg( gettext("Parse input files... ") ) if $verbose;

$doc->process(
    'file_in_name'    => \@masterfiles,
    'file_in_charset' => $mastchar,
    'po_out_name'     => $pot_filename
);

print STDERR wrap_msg( gettext("done.") ) if $verbose;

while ( my $po_filename = shift @pofiles ) {
    my $usable_pofile = 0;
    if ( -e $po_filename ) {

        # Check that the po file is not empty, as msgmerge has issues in this case (see Debian's #1022216 and GitHub's #442)
        my $pofile = Locale::Po4a::Po->new();
        $pofile->read($po_filename);
        $usable_pofile = 1 if ( $pofile->count_entries() > 0 );
    }
    if ($usable_pofile) {
        print STDERR wrap_msg( gettext("Updating %s:"), $po_filename )
          if $verbose;
        my @cmd = ( "msgmerge" . $Config{_exe} );
        push( @cmd, split( /\s+/, $msgmerge_opt ) ) if length($msgmerge_opt);
        push @cmd, ( "-U", $po_filename, $pot_filename );
        print STDERR "Running " . join( ' ', @cmd ) . "\n" if $debug;
        system(@cmd) == 0
          or die wrap_msg( gettext("Could not run msgmerge: %s\nThe command was: %s"), $!, join( ' ', @cmd ) );
        @cmd = ( "msgfmt" . $Config{_exe}, "--statistics", "-v", "-o", File::Spec->devnull(), $po_filename );
        print STDERR "Running " . join( ' ', @cmd ) . "\n" if $debug;
        system(@cmd)
          if $verbose;
    } else {
        print STDERR wrap_msg( gettext("Creating %s:"), $po_filename )
          if $verbose;
        copy( $pot_filename, $po_filename )
          or die wrap_msg( gettext("Could not copy the PO file (%s -> %s): %s"), $pot_filename, $po_filename, $! );
    }
}

unlink($pot_filename);