Allow comments to organizer in icalendar event replies (Bug#72831)

* lisp/gnus/gnus-icalendar.el
(gnus-icalendar-event--build-reply-event-body): Add optional COMMENT
argument to be inserted into the reply.
(gnus-icalendar-event-reply-from-buffer): Add COMMENT argument to be
passed through to gnus-icalendar-event--build-reply-event-body
(gnus-icalendar-reply-accept, gnus-icalendar-reply-tentative,
gnus-icalendar-reply-decline): If interactively called with a prefix
argument ask user for a COMMENT to add to the reply.

* test/lisp/gnus/gnus-icalendar-tests.el
(gnus-icalendar-accept-with-comment,
gnus-icalendar-decline-without-changing-comment): New tests.

1 files changed, 72 insertions, 0 deletions

diff --git a/test/lisp/gnus/gnus-icalendar-tests.el b/test/lisp/gnus/gnus-icalendar-tests.el
index 08c85013d17..72f1e660077 100644
--- a/test/lisp/gnus/gnus-icalendar-tests.el
+++ b/test/lisp/gnus/gnus-icalendar-tests.el
@@ -255,5 +255,77 @@ END:VCALENDAR" (list "participant@anoncompany.com"))))
 <2020-09-21 14:00-14:30 +1w>")))
       (setenv "TZ" tz))))
 
+(ert-deftest gnus-icalendar-accept-with-comment ()
+  ""
+  (let ((event "BEGIN:VEVENT
+DTSTART;TZID=Europe/Berlin:20200915T140000
+DTEND;TZID=Europe/Berlin:20200915T143000
+RRULE:FREQ=WEEKLY;BYDAY=FR,MO,TH,TU,WE
+DTSTAMP:20200915T120627Z
+ORGANIZER;CN=anon@anoncompany.com:mailto:anon@anoncompany.com
+UID:7b6g3m7iftuo90ei4ul00feqn_R20200915T120000@google.com
+ATTENDEE;CUTYPE=INDIVIDUAL;PARTSTAT=NEEDS-ACTION;RSVP=TRUE
+ ;CN=participant@anoncompany.com;X-NUM-GUESTS=0:mailto:participant@anoncompany.com
+CREATED:20200325T095723Z
+DESCRIPTION:Coffee talk
+LAST-MODIFIED:20200915T120623Z
+LOCATION:
+SEQUENCE:0
+STATUS:CONFIRMED
+SUMMARY:Casual coffee talk
+TRANSP:OPAQUE
+END:VEVENT")
+        (icalendar-identities '("participant@anoncompany.com")))
+    (unwind-protect
+        (progn
+          (let* ((reply (with-temp-buffer
+                         (insert event)
+                         (gnus-icalendar-event-reply-from-buffer
+                          (current-buffer)
+                          'accepted
+                          icalendar-identities
+                          "Can not stay long."))))
+            (should (string-match "^ATTENDEE;.*?\\(PARTSTAT=[^;]+\\)" reply))
+            (should (string-equal (match-string 1 reply) "PARTSTAT=ACCEPTED"))
+            (should (string-match "^COMMENT:\\(.*\\)$" reply))
+            (should (string-equal (match-string 1 reply) "Can not stay long.")))))))
+
+(ert-deftest gnus-icalendar-decline-without-changing-comment ()
+  ""
+  (let ((event "BEGIN:VEVENT
+DTSTART;TZID=Europe/Berlin:20200915T140000
+DTEND;TZID=Europe/Berlin:20200915T143000
+RRULE:FREQ=WEEKLY;BYDAY=FR,MO,TH,TU,WE
+DTSTAMP:20200915T120627Z
+ORGANIZER;CN=anon@anoncompany.com:mailto:anon@anoncompany.com
+UID:7b6g3m7iftuo90ei4ul00feqn_R20200915T120000@google.com
+ATTENDEE;CUTYPE=INDIVIDUAL;PARTSTAT=NEEDS-ACTION;RSVP=TRUE
+ ;CN=participant@anoncompany.com;X-NUM-GUESTS=0:mailto:participant@anoncompany.com
+CREATED:20200325T095723Z
+DESCRIPTION:Coffee talk
+LAST-MODIFIED:20200915T120623Z
+COMMENT:Only available at 2pm
+LOCATION:
+SEQUENCE:0
+STATUS:CONFIRMED
+SUMMARY:Casual coffee talk
+TRANSP:OPAQUE
+END:VEVENT")
+        (icalendar-identities '("participant@anoncompany.com")))
+    (unwind-protect
+        (progn
+          (let* ((reply (with-temp-buffer
+                        (insert event)
+                        (gnus-icalendar-event-reply-from-buffer
+                         (current-buffer)
+                          'declined
+                          icalendar-identities
+                          nil))))
+            (should (string-match "^ATTENDEE;.*?\\(PARTSTAT=[^;]+\\)" reply))
+            (should (string-equal (match-string 1 reply) "PARTSTAT=DECLINED"))
+            (should (string-match "^COMMENT:\\(.*\\)$" reply))
+            (should (string-equal (match-string 1 reply) "Only available at 2pm"))
+                        )))))
+
 (provide 'gnus-icalendar-tests)
 ;;; gnus-icalendar-tests.el ends here