1 files changed, 36 insertions, 0 deletions
diff --git a/lib/MaildirIndexer/Index/ByRef.pm6 b/lib/MaildirIndexer/Index/ByRef.pm6
new file mode 100644
index 0000000..497b5a1
--- /dev/null
+++ b/lib/MaildirIndexer/Index/ByRef.pm6
@@ -0,0 +1,36 @@
+use v6.d;
+use MaildirIndexer::Index;
+unit class MaildirIndexer::Index::ByRef does MaildirIndexer::Index;
+use MaildirIndexer::Email;
+
+has Str %!id-for-file;
+has Str %!mailboxes-for-id;
+
+method dump() {
+    say "{.key} → {.value}" for %!id-for-file;
+    say "{.key} ⇒ {.value.perl}" for %!mailboxes-for-id;
+}
+
+method add-mail(MaildirIndexer::Email:D $email, Str:D $mailbox --> Nil) {
+    my $id = $email.message-id or return;
+    %!id-for-file{ $email.path } = $id;
+    %!mailboxes-for-id{ $id }.push($mailbox);
+    return;
+}
+
+method del-path(IO:D $file, Str:D $mailbox --> Nil) {
+    my $id = %!id-for-file{ $file.path }:delete;
+    with %!mailboxes-for-id{ $id } {
+        with .grep($mailbox):k -> $pos {
+            .splice($pos,1);
+        }
+    }
+    return;
+}
+
+method mailbox-for-email(MaildirIndexer::Email:D $email --> Str) {
+    for |$email.refs() -> $ref {
+        with %!mailboxes-for-id{$ref} { return .[*-1] }
+    }
+    return Nil;
+}