support mentions with ~username to match 9fff6ae

app/models/comment.rb

@@ -265,7 +265,7 @@ def deliver_notifications
   end
 
   def deliver_mention_notifications(notified = [])
-    to_notify = plaintext_comment.scan(/\B@([\w\-]+)/).flatten.uniq
+    to_notify = plaintext_comment.scan(/\B[@~]([\w\-]+)/).flatten.uniq
     (to_notify - notified).each do |mention|
       if notified.include? mention
         next

spec/models/comment_spec.rb

@@ -79,20 +79,27 @@
     recipient = create(:user)
     recipient.settings["email_notifications"] = true
     recipient.settings["email_mentions"] = true
-    # Need to save, because deliver_mention_notifications re-fetches from DB.
     recipient.save!
 
     sender = create(:user)
-    # Story under which the comment is posted.
-    story = create(:story)
-    # The comment.
-    c = build(:comment, story: story, user: sender, comment: "@#{recipient.username}")
+    c = build(:comment, user: sender, comment: "@#{recipient.username}")
 
     c.save!
     expect(sent_emails.size).to eq(1)
     expect(sent_emails[0].subject).to match(/Mention from #{sender.username}/)
   end
 
+  it "also sends mentions with ~username" do
+    recipient = create(:user)
+    recipient.settings["email_notifications"] = true
+    recipient.settings["email_mentions"] = true
+    recipient.save!
+
+    c = build(:comment, comment: "~#{recipient.username}")
+    c.save!
+    expect(sent_emails.size).to eq(1)
+  end
+
   it "sends only reply notification on reply with mention" do
     # User being mentioned and replied to.
     recipient = create(:user)