From 6715c9b0e03a50e08a2ecc2dd9395fda0dded196 Mon Sep 17 00:00:00 2001
From: Yuchen Pei <id@ypei.org>
Date: Sun, 24 Nov 2024 19:54:47 +1100
Subject: Display a warning when composing a reply mentioning users from
 instances that have suspended you

These users would not be able to see your reply through their
instances.
---
 lisp/mastodon-toot.el | 26 ++++++++++++++++++++++++++
 1 file changed, 26 insertions(+)

(limited to 'lisp/mastodon-toot.el')

diff --git a/lisp/mastodon-toot.el b/lisp/mastodon-toot.el
index 4ba5e5d..bc34bcd 100644
--- a/lisp/mastodon-toot.el
+++ b/lisp/mastodon-toot.el
@@ -1784,6 +1784,29 @@ REPLY-REGION is a string to be injected into the buffer."
         (setq mastodon-toot--visibility reply-visibility))
       (mastodon-toot--set-cw reply-cw))))
 
+(defun mastodon-toot--warn-remote-suspension (reply-to-user)
+  (let* ((domains
+         (delete-dups
+          (mapcar
+           (lambda (user) (caddr (string-split user "@")))
+           (string-split reply-to-user " "))))
+         (suspended-by
+          (seq-filter
+           #'mastodon-tl--remote-suspended-p
+           domains)))
+    (cond ((length= domains (length suspended-by))
+           (display-warning
+            'mastodon
+            "All domains of user mentions in this reply draft have suspended you"
+            :warning))
+          (suspended-by
+           (display-warning
+            'mastodon
+            (format
+             "Some domains of user mentions in this reply draft have suspended you: %s"
+             (string-join suspended-by " "))
+            :warning)))))
+
 (defun mastodon-toot--update-status-fields (&rest _args)
   "Update the status fields in the header based on the current state."
   (ignore-errors  ;; called from after-change-functions so let's not leak errors
@@ -2025,6 +2048,8 @@ EDIT means we are editing an existing toot, not composing a new one."
           (mastodon-toot--display-docs-and-status-fields reply-text)
           (mastodon-toot--fill-reply-in-compose))
       (mastodon-toot--display-docs-and-status-fields))
+    (setq reply-to-user (string-join
+                         (delete-dups (string-split reply-to-user " ")) " "))
     ;; `reply-to-user' (alone) is also used by `mastodon-tl--dm-user', so
     ;; perhaps we should not always call --setup-as-reply, or make its
     ;; workings conditional on reply-to-id. currently it only checks for
@@ -2032,6 +2057,7 @@ EDIT means we are editing an existing toot, not composing a new one."
     (mastodon-toot--setup-as-reply reply-to-user reply-to-id reply-json
                                    ;; only initial-text if reply (not edit):
                                    (when reply-json initial-text))
+    (mastodon-toot--warn-remote-suspension reply-to-user)
     (unless mastodon-toot--max-toot-chars
       ;; no need to fetch from `mastodon-profile-account-settings' as
       ;; `mastodon-toot--max-toot-chars' is set when we set it
-- 
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