path: root/pandoc-filter-bib

#!/usr/bin/perl

use warnings;
use strict;

use v5.10.1; # use switch keyword "when" (but avoid too complex "given")
no if $] >= 5.018, warnings => "experimental::smartmatch";

use Pandoc::Filter;
use Pandoc::Elements;

use Path::Tiny;
use List::Util qw(pairmap);

my $bibfilename = $ENV{'PANDOC_CITEPROC_FILE'} || 'bibliography.bib';
my $bibfile = path($bibfilename);

my (@a, $i);

pandoc_filter sub {
    my $self = shift;
    return unless ($self->name eq 'RawInline' and $self->format eq 'mediawiki');

    for ($self->content) {
        when (/^{{cite\s+(\w+)\s*\|([^}]*)}}$/) {
            my $id = 'ref'.++$i;
            my @data = pairmap { $b =~ s/"/\\"/g; "$a=\"$b\"" }
                map { /^\s*(\w+)\s*=\s*"?(.*?)"?\s*$/ }
                    split( /\|/, $2 );
            push @a, join ",\n",
                '@'.$1.'{'.$id,
                @data,
                '}';
            return Cite(
                [{
                    'citationId' => $id,
                    'citationPrefix' => [],
                    'citationSuffix' => [],
                    'citationMode' => {
                        t => 'NormalCitation',
                        c => [],
                    },
                    'citationNoteNum' => 0,
                    'citationHash' => 0,
                 }],
                [ Str $id ],
            );
        }
        when (/^{{citation needed}}$/) {
            say STDERR "WARNING: Mediawiki citation needed.";
            return [
                Str "citation",
                Space,
                Str "needed",
            ];
        }
        default {
            say STDERR "WARNING: Mediawiki unknown data skipped: "
                . '"' . $_[0]->content . '"';
            return Str "";
        }
    }
};

END {
    $bibfile->spew_utf8( join "\n\n", @a )
        if (@a);
}