From 51c6d49b9392179e7ea349f01b2a83706819023e Mon Sep 17 00:00:00 2001
From: Pierre-Yves Chibon <pingou@pingoured.fr>
Date: Feb 12 2016 10:57:46 +0000
Subject: Notify user when they are mentioned in a comment


Using this mechanism, you can get someone's attention by simply
mentioning them in a ticket using @username.

---

diff --git a/pagure/lib/notify.py b/pagure/lib/notify.py
index dd57a1e..39cfb11 100644
--- a/pagure/lib/notify.py
+++ b/pagure/lib/notify.py
@@ -13,6 +13,7 @@ import datetime
 import hashlib
 import json
 import urlparse
+import re
 import smtplib
 import time
 import warnings
@@ -61,6 +62,18 @@ def log(project, topic, msg, redis=None):
             }))
 
 
+def _add_mentioned_users(emails, comment):
+    ''' Check the comment to see if an user is mentioned in it and if
+    so add this user to the list of people to notify.
+    '''
+    MENTION_RE = r'@(\w+)'
+    for username in re.findall(MENTION_RE, comment):
+        user = pagure.lib.search_user(pagure.SESSION, username=username)
+        if user:
+            emails.add(user.default_email)
+    return emails
+
+
 def _clean_emails(emails, user):
     ''' Remove the email of the user doing the action if it is in the list.
 
@@ -229,6 +242,7 @@ def notify_new_comment(comment, user=None):
     if comment.user and comment.user.default_email:
         mail_to.add(comment.user.default_email)
 
+    mail_to = _add_mentioned_users(mail_to, comment.comment)
     mail_to = _clean_emails(mail_to, user)
 
     send_email(
@@ -263,6 +277,7 @@ def notify_new_issue(issue, user=None):
            'issue',
            issue.id))
     mail_to = _get_emails_for_issue(issue)
+    mail_to = _add_mentioned_users(mail_to, issue.content)
     mail_to = _clean_emails(mail_to, user)
 
     send_email(
@@ -470,6 +485,7 @@ def notify_pull_request_comment(comment, user):
            'pull-request',
            comment.pull_request.id))
     mail_to = _get_emails_for_issue(comment.pull_request)
+    mail_to = _add_mentioned_users(mail_to, comment.comment)
     mail_to = _clean_emails(mail_to, user)
 
     send_email(