Add support for Nicknames on IRC (#4170)

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

src/messages/SharedMessageBuilder.cpp

@@ -246,4 +246,60 @@ void SharedMessageBuilder::triggerHighlights()
     }
 }
 
+QString SharedMessageBuilder::stylizeUsername(const QString &username,
+                                              const Message &message)
+{
+    auto app = getApp();
+
+    const QString &localizedName = message.localizedName;
+    bool hasLocalizedName = !localizedName.isEmpty();
+
+    // The full string that will be rendered in the chat widget
+    QString usernameText;
+
+    switch (getSettings()->usernameDisplayMode.getValue())
+    {
+        case UsernameDisplayMode::Username: {
+            usernameText = username;
+        }
+        break;
+
+        case UsernameDisplayMode::LocalizedName: {
+            if (hasLocalizedName)
+            {
+                usernameText = localizedName;
+            }
+            else
+            {
+                usernameText = username;
+            }
+        }
+        break;
+
+        default:
+        case UsernameDisplayMode::UsernameAndLocalizedName: {
+            if (hasLocalizedName)
+            {
+                usernameText = username + "(" + localizedName + ")";
+            }
+            else
+            {
+                usernameText = username;
+            }
+        }
+        break;
+    }
+
+    auto nicknames = getCSettings().nicknames.readOnly();
+
+    for (const auto &nickname : *nicknames)
+    {
+        if (nickname.match(usernameText))
+        {
+            break;
+        }
+    }
+
+    return usernameText;
+}
 }  // namespace chatterino

src/messages/SharedMessageBuilder.hpp

@@ -38,6 +38,9 @@ public:
     // Parses "badges" tag which contains a comma separated list of key-value elements
     static std::vector<Badge> parseBadgeTag(const QVariantMap &tags);
 
+    static QString stylizeUsername(const QString &username,
+                                   const Message &message);
+
 protected:
     virtual void parse();