From 6a0ba55dc339b67afa363771525110c575fe6f62 Mon Sep 17 00:00:00 2001
From: Anton Khirnov <anton@khirnov.net>
Date: Sat, 20 Nov 2021 16:13:43 +0100
Subject: commands/thread: refactor adding mail-followup-to header

Move it to a separate function, simplify flow control.
---
 alot/commands/thread.py | 31 +++++++++++++++++++------------
 1 file changed, 19 insertions(+), 12 deletions(-)

diff --git a/alot/commands/thread.py b/alot/commands/thread.py
index cba0af65..400d4774 100644
--- a/alot/commands/thread.py
+++ b/alot/commands/thread.py
@@ -185,6 +185,18 @@ class ReplyCommand(Command):
         references.append('<%s>' % message.id)
         return ' '.join(references)
 
+    def _mail_followup_to(self, recipients):
+        if not settings.get('followup_to'):
+            return None
+
+        lists = settings.get('mailinglists')
+
+        # check if any recipient address matches a known mailing list
+        if any(addr in lists for n, addr in getaddresses(recipients)):
+            followupto = ', '.join(recipients)
+            logging.debug('mail followup to: %s', followupto)
+            return followupto
+
     async def apply(self, ui):
         message = ui.current_buffer.get_selected_message()
 
@@ -280,22 +292,17 @@ class ReplyCommand(Command):
         # Finally setup the 'To' header
         headers[HDR.TO] = to
 
-        # if any of the recipients is a mailinglist that we are subscribed to,
-        # set Mail-Followup-To header so that duplicates are avoided
-        if settings.get('followup_to'):
-            # to and cc are already cleared of our own address
-            allrecipients = [to] + cc
-            lists = settings.get('mailinglists')
-            # check if any recipient address matches a known mailing list
-            if any(addr in lists for n, addr in getaddresses(allrecipients)):
-                followupto = ', '.join(allrecipients)
-                logging.debug('mail followup to: %s', followupto)
-                headers[HDR.MAIL_FOLLOWUP_TO] = followupto
-
         # set In-Reply-To + References headers
         headers[HDR.IN_REPLY_TO] = '<%s>' % message.id
         headers[HDR.REFERENCES]  = self._reply_references(message)
 
+        # if any of the recipients is a mailinglist that we are subscribed to,
+        # set Mail-Followup-To header so that duplicates are avoided
+        # to and cc are already cleared of our own address
+        mft = self._mail_followup_to([to] + cc)
+        if mft:
+            headers[HDR.MAIL_FOLLOWUP_TO] = mft
+
         # construct the envelope
         envelope = Envelope(headers = headers, bodytext = mailcontent,
                             account = account, replied = message)
-- 
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