crabmail

commit 1b74e83ac90fdb4941ba213401b2d6ada2ee8fc9
parent 1811d91a94c9f0eebd675132636e980b6eb55853
Author: alex wennerberg <alex@alexwennerberg.com>
Date:   Sun,  6 Feb 2022 14:26:35 -0800

add wip threading file

Diffstat:
A
src/threading.rs
 | 
46
++++++++++++++++++++++++++++++++++++++++++++++

1 file changed, 46 insertions(+), 0 deletions(-)
diff --git a/src/threading.rs b/src/threading.rs
@@ -0,0 +1,46 @@
+// Take an iterator of emails and build a thread
+// jmap threading algorithm
+// For new implementations, it is
+// suggested that two messages belong in the same Thread if both of the
+// following conditions apply:
+
+// 1.  An identical message id [RFC5322] appears in both messages in any
+//     of the Message-Id, In-Reply-To, and References header fields.
+// 2.  After stripping automatically added prefixes such as "Fwd:",
+//     "Re:", "[List-Tag]", etc., and ignoring white space, the subjects
+//     are the same.  This avoids the situation where a person replies
+//     to an old message as a convenient way of finding the right
+//     recipient to send to but changes the subject and starts a new
+//     conversation.
+
+// If messages are delivered out of order for some reason, a user may
+// have two Emails in the same Thread but without headers that associate
+// them with each other.  The arrival of a third Email may provide the
+// missing references to join them all together into a single Thread.
+// Since the "threadId" of an Email is immutable, if the server wishes
+// to merge the Threads, it MUST handle this by deleting and reinserting
+// (with a new Email id) the Emails that change "threadId".
+
+// A *Thread* object has the following properties:
+
+// o  id: "Id" (immutable; server-set)
+
+
+//    The id of the Thread.
+
+// o  emailIds: "Id[]" (server-set)
+
+//    The ids of the Emails in the Thread, sorted by the "receivedAt"
+//    date of the Email, oldest first.  If two Emails have an identical
+//    date, the sort is server dependent but MUST be stable (sorting by
+//    id is recommended).
+
+use mail_parser::Message;
+
+fn Index {
+}
+
+impl Index {
+    fn build(emails: impl Iterator<Item = Message>) -> Self {
+    }
+}