refactor: put duplicate code into lookup_chat_or_create_adhoc_group

src/receive_imf.rs

@@ -840,31 +840,20 @@ async fn add_parts(
         }
 
         if chat_id.is_none() {
-            // try to assign to a chat based on In-Reply-To/References:
-
-            if let Some((new_chat_id, new_chat_id_blocked)) =
-                lookup_chat_by_reply(context, mime_parser, &parent, to_ids, from_id).await?
-            {
-                chat_id = Some(new_chat_id);
-                chat_id_blocked = new_chat_id_blocked;
-            }
-        }
-
-        if chat_id.is_none() && (allow_creation || test_normal_chat.is_some()) {
-            // Try to create an ad hoc group.
-            if let Some(new_chat_id) = create_adhoc_group(
+            if let Some((new_chat_id, new_chat_id_blocked)) = lookup_chat_or_create_adhoc_group(
                 context,
                 mime_parser,
-                create_blocked,
-                from_id,
+                &parent,
                 to_ids,
+                from_id,
+                allow_creation || test_normal_chat.is_some(),
+                create_blocked,
                 is_partial_download.is_some(),
             )
-            .await
-            .context("Could not create ad hoc group")?
+            .await?
             {
                 chat_id = Some(new_chat_id);
-                chat_id_blocked = create_blocked;
+                chat_id_blocked = new_chat_id_blocked;
             }
         }
 
@@ -1087,17 +1076,6 @@ async fn add_parts(
             }
         }
 
-        if chat_id.is_none() {
-            // try to assign to a chat based on In-Reply-To/References:
-
-            if let Some((new_chat_id, new_chat_id_blocked)) =
-                lookup_chat_by_reply(context, mime_parser, &parent, to_ids, from_id).await?
-            {
-                chat_id = Some(new_chat_id);
-                chat_id_blocked = new_chat_id_blocked;
-            }
-        }
-
         if mime_parser.decrypting_failed && !fetching_existing_messages {
             if chat_id.is_none() {
                 chat_id = Some(DC_CHAT_ID_TRASH);
@@ -1129,20 +1107,21 @@ async fn add_parts(
             }
         }
 
-        if chat_id.is_none() && allow_creation {
-            if let Some(new_chat_id) = create_adhoc_group(
+        if chat_id.is_none() {
+            if let Some((new_chat_id, new_chat_id_blocked)) = lookup_chat_or_create_adhoc_group(
                 context,
                 mime_parser,
-                Blocked::Not,
-                from_id,
+                &parent,
                 to_ids,
+                from_id,
+                allow_creation,
+                Blocked::Not,
                 is_partial_download.is_some(),
             )
-            .await
-            .context("Could not create ad hoc group")?
+            .await?
             {
                 chat_id = Some(new_chat_id);
-                chat_id_blocked = Blocked::Not;
+                chat_id_blocked = new_chat_id_blocked;
             }
         }
 
@@ -1811,6 +1790,44 @@ async fn lookup_chat_by_reply(
     Ok(Some((parent_chat.id, parent_chat.blocked)))
 }
 
+#[allow(clippy::too_many_arguments)]
+async fn lookup_chat_or_create_adhoc_group(
+    context: &Context,
+    mime_parser: &MimeMessage,
+    parent: &Option<Message>,
+    to_ids: &[ContactId],
+    from_id: ContactId,
+    allow_creation: bool,
+    create_blocked: Blocked,
+    is_partial_download: bool,
+) -> Result<Option<(ChatId, Blocked)>> {
+    if let Some((new_chat_id, new_chat_id_blocked)) =
+        // Try to assign to a chat based on In-Reply-To/References.
+        lookup_chat_by_reply(context, mime_parser, parent, to_ids, from_id).await?
+    {
+        Ok(Some((new_chat_id, new_chat_id_blocked)))
+    } else if allow_creation {
+        // Try to create an ad hoc group.
+        if let Some(new_chat_id) = create_adhoc_group(
+            context,
+            mime_parser,
+            create_blocked,
+            from_id,
+            to_ids,
+            is_partial_download,
+        )
+        .await
+        .context("Could not create ad hoc group")?
+        {
+            Ok(Some((new_chat_id, create_blocked)))
+        } else {
+            Ok(None)
+        }
+    } else {
+        Ok(None)
+    }
+}
+
 /// If this method returns true, the message shall be assigned to the 1:1 chat with the sender.
 /// If it returns false, it shall be assigned to the parent chat.
 async fn is_probably_private_reply(