#!/usr/bin/perl

# tidy BibLaTeX file

# Depends: bibclean libpath-tiny-perl

use v5.36;
use strict;

use IPC::Run3 qw/run3/;

=head1 NAME

biblatex-tidy - tidy BibLaTeX data

=head1 VERSION

Version 0.0.1

=head1 SYNOPSIS

    biblatex-tidy INFILE

    biblatex-tidy INFILE OUTFILE

    biblatex-tidy < INFILE > OUTFILE

=head1 DESCRIPTION

B<biblatex-tidy> reformats BibLaTeX data.

If a only a single filename is given,
the file contents are replaced.

If two filenames are given,
the first is read and cleaned output is saved the the second.

If no filenames are given,
then data is expected on STDIN
and cleaned data is emitted on STDOUT.

Internally,
the tool B<bibclean> is called internally to do the actual tidying.
If data contains a line beginning with C<@Comment{jabref-meta:>,
typically added by JabRef at the end of BibLaTeX data,
then the remaining data is I<not> cleaned,
because B<bibclean> fails to parse such comments.
=cut

# slurp INFILE if passed as first argument, or else STDIN
my ( $infile, $outfile, $bogus ) = @ARGV;
die 'Too many arguments: expected INFILE and OUTFILE' if $bogus;
@ARGV = ($infile) if $infile;
my $content = do { local $/ = undef; <> };

# put aside eventual trailing JabRef comments to not confuse bibclean
my ( $data, $comments ) = split /(?=\n\@Comment\{jabref-meta:)/, $content, 2;

# call bibclean on comment-stripped data
my @command = qw(bibclean -max-width 0);
my $newdata;
run3( \@command, \$data, \$newdata,
	{ binmode_stdin => ':utf8', binmode_stdout => ':utf8' } )
	or die "Failed to execute @command: $?";

# save/replace/spew cleaned data, reviving eventual trailing comments
if ($infile) {
	open( FH, '>', $outfile || $infile ) or die $!;
	print FH $newdata, $comments;
}
else {
	print $newdata, $comments;
}

=encoding UTF-8

=head1 AUTHOR

Jonas Smedegaard C<< <dr@jones.dk> >>

=head1 COPYRIGHT AND LICENSE

  Copyright © 2024 Jonas Smedegaard

This program is free software:
you can redistribute it and/or modify it
under the terms of the GNU Affero General Public License
as published by the Free Software Foundation,
either version 3, or (at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY;
without even the implied warranty
of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
See the GNU Affero General Public License for more details.

You should have received a copy
of the GNU Affero General Public License along with this program.
If not, see <https://www.gnu.org/licenses/>.

=cut

1;