Load and display the root PGN.

[remoteglot-book] / www / opening-stats.pl

diff --git a/www/opening-stats.pl b/www/opening-stats.pl
index b62a30b605a23b787c00f5e4bf919bf852fb0c16..9a2ccbc4ad32380598abc2d9a17d6a46e2a4fa59 100755 (executable)
--- a/www/opening-stats.pl
+++ b/www/opening-stats.pl
@@ -19,11 +19,19 @@ my $fen = $cgi->param('fen') // 'rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w K
 my $pos = Position->from_fen($fen);
 my $hex = unpack('H*', $pos->bitpacked_fen);
 print $chld_in $hex, "\n";
-my $line = <$chld_out>;
+chomp (my $line = <$chld_out>);
 
-my ($white, $draw, $black, $opening_num, $white_avg_elo, $black_avg_elo, $num_elo, $timestamp, @moves) = split / /, $line;
+my ($white, $draw, $black, $opening_num, $white_avg_elo, $black_avg_elo, $num_elo, $timestamp, $pgn_file_number, $pgn_start_position, @moves) = split / /, $line;
 my $opening = $openings{$opening_num} // 'A00: Start position';
 
+my $root_pgn;
+eval {
+       $root_pgn = read_root_pgn($pgn_file_number, $pgn_start_position);
+};
+if ($@) {
+       $root_pgn = "Could not find root PGN. ($@)";
+}
+
 # Explore one move out.
 my @json_moves = ();
 for my $move (@moves) {
@@ -44,7 +52,7 @@ for my $move (@moves) {
 }
 
 print $cgi->header(-type=>'application/json');
-print JSON::XS::encode_json({ moves => \@json_moves, opening => $opening });
+print JSON::XS::encode_json({ moves => \@json_moves, opening => $opening, root_pgn => $root_pgn });
 
 sub num {
        my $x = shift;
@@ -65,3 +73,32 @@ sub read_openings {
        }
        close $fh;
 }
+
+sub read_root_pgn {
+       my @pgnnames;
+       open my $pgnnamesfh, "<", "../pgnnames.txt"
+               or die "../pgnnames.txt: $!";
+       while (<$pgnnamesfh>) {
+               chomp;
+               push @pgnnames, $_;
+               warn "PGN name: $_";
+       }
+       close $pgnnamesfh;
+
+       if ($pgn_file_number > $#pgnnames) {
+               die "Unknown PGN file number $pgn_file_number";
+       }
+
+       my $root_pgn;
+       open my $pgnfh, "<", "../" . $pgnnames[$pgn_file_number]
+               or die $pgnnames[$pgn_file_number] . ": $!";
+       sysseek($pgnfh, $pgn_start_position, 0)
+               or die "Could not seek to $pgn_start_position: $!";
+       sysread($pgnfh, $root_pgn, 32768)
+               or die "Could not read PGN from $pgn_start_position at $pgnnames[$pgn_file_number]: $!";
+       close $pgnfh;
+       $root_pgn =~ s/^.*?(\[Event )/$1/s;
+       $root_pgn =~ s/^(.+?)\[Event .*/$1/s;
+
+       return $root_pgn;
+}