threading: implement on-the-fly message threading

implement message threading on the message store level using the
jwz algorithm. Build threads on-the-fly when new message headers arrive.

Use the references header to create the threads and the in-reply-to
header as a fall-back option in case no references header is present.

Does not run when the worker provides its own threading (e.g. imap
server threads).

Include only those message headers that have been fetched and are
stored in the message store.

References: https://www.jwz.org/doc/threading.html
Signed-off-by: Koni Marti <koni.marti@gmail.com>
Tested-by: Inwit <inwit@sindominio.net>
Tested-by: akspecs <akspecs@gmail.com>
Acked-by: Robin Jarry <robin@jarry.cc>

1 files changed, 17 insertions, 0 deletions

diff --git a/go.sum b/go.sum
index c1f3d6e..b828719 100644
--- a/go.sum
+++ b/go.sum
@@ -43,6 +43,7 @@ github.com/ProtonMail/go-crypto v0.0.0-20211221144345-a4f6767435ab/go.mod h1:z4/
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@@ -84,8 +85,11 @@ github.com/envoyproxy/go-control-plane v0.9.4/go.mod h1:6rpuAdCZL397s3pYoYcLgu1m
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@@ -93,6 +97,8 @@ github.com/go-gl/glfw/v3.3/glfw v0.0.0-20191125211704-12ad95a8df72/go.mod h1:tQ2
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@@ -150,6 +156,8 @@ github.com/hashicorp/golang-lru v0.5.1/go.mod h1:/m3WP610KZHVQ1SGc6re/UDhFvYD7pJ
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@@ -258,6 +271,7 @@ golang.org/x/net v0.0.0-20200520182314-0ba52f642ac2/go.mod h1:qpuaurCH72eLCgpAm/
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@@ -301,6 +315,7 @@ golang.org/x/sys v0.0.0-20200515095857-1151b9dac4a9/go.mod h1:h1NjWce9XRLGQEsW7w
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@@ -308,6 +323,7 @@ golang.org/x/sys v0.0.0-20211030160813-b3129d9d1021 h1:giLT+HuUP/gXYrG2Plg9WTjj4
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