From 717fbbe7720f64b305668a9d28b1007fd8d0595e Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Roman=20Smr=C5=BE?= <roman.smrz@seznam.cz>
Date: Fri, 5 Jun 2026 21:18:15 +0200
Subject: Conversation history with change since earlier state

---
 src/Erebos/Conversation.hs | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/src/Erebos/Conversation.hs b/src/Erebos/Conversation.hs
index 472195c..c9a3b59 100644
--- a/src/Erebos/Conversation.hs
+++ b/src/Erebos/Conversation.hs
@@ -23,6 +23,7 @@ module Erebos.Conversation (
     conversationName,
     conversationPeer,
     conversationHistory,
+    conversationHistoryChange,
 
     sendMessage,
     deleteConversation,
@@ -85,6 +86,11 @@ withConversation :: (forall conv msg. ConversationType conv msg => conv -> a) ->
 withConversation f (DirectMessageConversation conv) = f conv
 withConversation f (ChatroomConversation conv) = f conv
 
+withConversations :: (forall conv msg. ConversationType conv msg => Maybe conv -> conv -> a) -> Conversation -> Conversation -> a
+withConversations f (DirectMessageConversation conv) (DirectMessageConversation conv') = f (Just conv) conv'
+withConversations f (ChatroomConversation conv) (ChatroomConversation conv') = f (Just conv) conv'
+withConversations f _ conv = withConversation (f Nothing) conv
+
 isSameConversation :: Conversation -> Conversation -> Bool
 isSameConversation (DirectMessageConversation t) (DirectMessageConversation t')
     = sameIdentity (msgPeer t) (msgPeer t')
@@ -134,6 +140,9 @@ conversationPeer (ChatroomConversation _) = Nothing
 conversationHistory :: Conversation -> [ Message ]
 conversationHistory = withConversation $ map (uncurry Message) . snd . convMessageListSince Nothing
 
+conversationHistoryChange :: Conversation -> Conversation -> ( Int, [ Message ] )
+conversationHistoryChange = withConversations $ \since -> fmap (map (uncurry Message)) . convMessageListSince since
+
 
 sendMessage :: (MonadHead LocalState m, MonadError e m, FromErebosError e) => Conversation -> Text -> m ()
 sendMessage (DirectMessageConversation thread) text = sendDirectMessage (msgPeer thread) text
-- 
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