From 287bf609554c5b0e9d82f28e89f6ca988b8fd452 Mon Sep 17 00:00:00 2001
From: Kevin Kuehler <keur@xcf.berkeley.edu>
Date: Thu, 10 Oct 2019 15:27:13 -0700
Subject: Add thread deletion

Signed-off-by: Kevin Kuehler <keur@xcf.berkeley.edu>
---
 lib/msgstore.go        | 24 ++++++++++++++++++++++++
 worker/imap/open.go    |  3 +++
 worker/types/thread.go | 15 +++++++++++++++
 3 files changed, 42 insertions(+)

diff --git a/lib/msgstore.go b/lib/msgstore.go
index e86dc56..2adefda 100644
--- a/lib/msgstore.go
+++ b/lib/msgstore.go
@@ -158,6 +158,18 @@ func merge(to *models.MessageInfo, from *models.MessageInfo) {
 	}
 }
 
+func (store *MessageStore) removeThread(threads []*types.Thread, needle *types.Thread) []*types.Thread {
+	var r []*types.Thread
+	for i, thread := range threads {
+		if thread.Uid == needle.Uid {
+			r = append(threads[:i], threads[i+1:]...)
+			r = append(r, needle.Children...)
+			break
+		}
+	}
+	return r
+}
+
 func (store *MessageStore) Update(msg types.WorkerMessage) {
 	update := false
 	directoryChange := false
@@ -251,6 +263,18 @@ func (store *MessageStore) Update(msg types.WorkerMessage) {
 			toDelete[uid] = nil
 			delete(store.Messages, uid)
 			delete(store.Deleted, uid)
+			if store.thread {
+				for _, thread := range store.Threads {
+					if needle := thread.Find(uid); needle != nil {
+						if needle.Parent == nil {
+							store.Threads = store.removeThread(store.Threads, needle)
+						} else {
+							needle.Parent.Children = store.removeThread(needle.Parent.Children, needle)
+						}
+						break
+					}
+				}
+			}
 		}
 		uids := make([]uint32, len(store.uids)-len(msg.Uids))
 		j := 0
diff --git a/worker/imap/open.go b/worker/imap/open.go
index bdb794b..78bcbb4 100644
--- a/worker/imap/open.go
+++ b/worker/imap/open.go
@@ -89,6 +89,9 @@ func convertThreads(threads []*sortthread.Thread) ([]*types.Thread, int) {
 			Uid:      t.Id,
 			Children: children,
 		}
+		for _, child := range children {
+			child.Parent = conv[i]
+		}
 		count += childCount + 1
 	}
 	return conv, count
diff --git a/worker/types/thread.go b/worker/types/thread.go
index a51a5c4..4a97ef6 100644
--- a/worker/types/thread.go
+++ b/worker/types/thread.go
@@ -3,6 +3,21 @@ package types
 type Thread struct {
 	Uid      uint32
 	Children []*Thread
+	Parent   *Thread
+}
+
+func (t *Thread) Find(uid uint32) *Thread {
+	if t.Uid == uid {
+		return t
+	}
+
+	for _, child := range t.Children {
+		if needle := child.Find(uid); needle != nil {
+			return needle
+		}
+	}
+
+	return nil
 }
 
 func (t *Thread) FormatThread(cb func(*Thread, []rune) bool) {
-- 
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