+sub match_nntp_url ($$$) {
+ my ($self, $url, $all) = @_; # $all = [ $lms->folders ];
+ $all //= [ $self->folders ];
+ require PublicInbox::URInntps;
+ my $want = PublicInbox::URInntps->new($url)->canonical;
+ my ($s, $h, $p) = ($want->scheme, $want->host, $want->port);
+ my $ng = $want->group; # force scalar (no article ranges)
+ my @uri = map { PublicInbox::URInntps->new($_)->canonical }
+ grep(m!\A\Q$s\E://.*?\Q$h\E\b.*?/\Q$ng\E\b!, @$all);
+ my @match;
+ for my $x (@uri) {
+ next if $x->group ne $ng || $x->host ne $h || $x->port != $p;
+ # maybe user was forgotten on CLI:
+ if (defined($x->userinfo) && !defined($want->userinfo)) {
+ push @match, $x;
+ } elsif (($x->userinfo//"\0") eq ($want->userinfo//"\0")) {
+ push @match, $x;
+ }
+ }
+ return @match if wantarray;
+ scalar(@match) <= 1 ? $match[0] :
+ "E: `$url' is ambiguous:\n\t".join("\n\t", @match)."\n";
+}
+