Fixed comma appended to username completion when not at the beginning of the message (#3060)

Co-authored-by: pajlada <rasmus.karlsson@pajlada.com>

src/util/Helpers.cpp

@@ -68,4 +68,17 @@ QColor getRandomColor(const QString &userId)
     return TWITCH_USERNAME_COLORS[colorIndex];
 }
 
+QString formatUserMention(const QString &userName, bool isFirstWord,
+                          bool mentionUsersWithComma)
+{
+    QString result = userName;
+
+    if (isFirstWord && mentionUsersWithComma)
+    {
+        result += ",";
+    }
+
+    return result;
+}
+
 }  // namespace chatterino

src/util/Helpers.hpp

@@ -20,4 +20,14 @@ QString kFormatNumbers(const int &number);
 
 QColor getRandomColor(const QString &userId);
 
+/**
+ * @brief Takes a user's name and some formatting parameter and spits out the standardized way to format it
+ *
+ * @param userName a user's name
+ * @param isFirstWord signifies whether this mention would be the first word in a message
+ * @param mentionUsersWithComma postfix mentions with a comma. generally powered by getSettings()->mentionUsersWithComma
+ **/
+QString formatUserMention(const QString &userName, bool isFirstWord,
+                          bool mentionUsersWithComma);
+
 }  // namespace chatterino