new file mode 100644
--- /dev/null
+++ b/gui/src/IRCWidget.cpp
@@ -0,0 +1,243 @@
+/* Quint - A graphical user interface for Octave
+ * Copyright (C) 2011 Jacob Dawid
+ * jacob.dawid@googlemail.com
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "IRCWidget.h"
+#include <QMessageBox>
+#include <QHBoxLayout>
+#include <QVBoxLayout>
+#include <QLabel>
+#include <QSettings>
+#include <QInputDialog>
+
+IRCWidget::IRCWidget(QWidget *parent, QString settingsFile) :
+    QWidget(parent)
+{
+    m_settingsFile = settingsFile;
+    m_alternatingColor = false;
+    QSettings settings(m_settingsFile, QSettings::IniFormat);
+    bool connectOnStartup = settings.value("connectOnStartup").toBool();
+    m_autoIdentification = settings.value("autoIdentification").toBool();
+    m_nickServPassword = settings.value("nickServPassword").toString();
+
+    m_initialNick = settings.value("IRCNick").toString();
+
+    if(m_initialNick.isEmpty())
+        m_initialNick = "OctaveGUI-User";
+
+    QVBoxLayout *layout = new QVBoxLayout();
+
+    m_chatWindow = new QTextEdit(this);
+    m_chatWindow->setReadOnly(true);
+    m_chatWindow->setEnabled(false);
+    QWidget* bottomWidget = new QWidget(this);
+
+    layout->addWidget(m_chatWindow);
+    layout->addWidget(bottomWidget);
+    setLayout(layout);
+
+    QHBoxLayout *bottomLayout = new QHBoxLayout();
+    m_nickButton = new QPushButton(bottomWidget);
+    m_nickButton->setStatusTip(tr((char*)"Click here to change your nick."));
+    m_nickButton->setText(m_initialNick);
+    m_inputLine = new QLineEdit(bottomWidget);
+    m_inputLine->setStatusTip(tr((char*)"Enter your message here."));
+    bottomLayout->addWidget(m_nickButton);
+    bottomLayout->addWidget(new QLabel(":", this));
+    bottomLayout->addWidget(m_inputLine);
+    bottomLayout->setMargin(0);
+    bottomWidget->setLayout(bottomLayout);
+    m_nickButton->setEnabled(false);
+    m_inputLine->setEnabled(false);
+
+    m_chatWindow->setFocusProxy(m_inputLine);
+    m_nickButton->setFocusProxy(m_inputLine);
+
+    QFont font;
+    font.setFamily("Courier");
+    font.setPointSize(11);
+    m_chatWindow->setFont(font);
+    m_ircClient = new IRCClient();
+
+    connect(m_nickButton, SIGNAL(clicked()), this, SLOT(nickPopup()));
+    connect(m_inputLine, SIGNAL(returnPressed()), this, SLOT(sendInputLine()));
+
+    connect(m_ircClient, SIGNAL(nickInUseChanged()), this, SLOT(handleNickInUseChanged()));
+    connect(m_ircClient, SIGNAL(connectionStatus(const char*)), this, SLOT(showStatusMessage(const char*)));
+    connect(m_ircClient, SIGNAL(error(const char*)), this, SLOT(showStatusMessage(const char*)));
+    connect(m_ircClient, SIGNAL(completedLogin(const char*)), this, SLOT(loginSuccessful(const char*)));
+    connect(m_ircClient, SIGNAL(completedLogin(const char*)), this, SLOT(joinOctaveChannel(const char*)));
+    connect(m_ircClient, SIGNAL(topic(const char*,const char*,const char*)), this, SLOT(showTopic(const char*,const char*,const char*)));
+    connect(m_ircClient, SIGNAL(join(const char*,const char*)), this, SLOT(showJoin(const char*, const char*)));
+    connect(m_ircClient, SIGNAL(quit(const char*,const char*)), this, SLOT(showQuit(const char*,const char*)));
+    connect(m_ircClient, SIGNAL(privateMessage(const char*,const char*,const char*)), this, SLOT(showPrivateMessage(const char*,const char*,const char*)));
+    connect(m_ircClient, SIGNAL(notice(const char*,const char*,const char*)), this, SLOT(showNotice(const char*,const char*,const char*)));
+    connect(m_ircClient, SIGNAL(nick(const char*,const char*)), this, SLOT(showNickChange(const char*, const char*)));
+    connect(m_ircClient, SIGNAL(replyCode(IRCEvent*)), this, SLOT(handleReplyCode(IRCEvent*)));
+
+    if(connectOnStartup)
+        connectToServer();
+}
+
+void IRCWidget::connectToServer() {
+    m_ircClient->connectToServer("irc.freenode.net", 6667,
+                                 m_initialNick.toStdString().c_str(),
+                                 m_initialNick.toStdString().c_str(),
+                                 "Unknown", "Unknown", 0, 0);
+}
+
+void IRCWidget::showStatusMessage(const char *message) {
+    m_chatWindow->append(QString("<i>%1</i>").arg(message));
+}
+
+void IRCWidget::joinOctaveChannel(const char*) {
+    m_ircClient->joinChannel("#octave");
+}
+
+void IRCWidget::loginSuccessful(const char *nick) {
+    m_chatWindow->append(QString("<i><font color=\"#00AA00\"><b>Successfully logged in as %1.</b></font></i>").arg(nick));
+    m_nickButton->setEnabled(true);
+    m_inputLine->setEnabled(true);
+    m_chatWindow->setEnabled(true);
+    m_inputLine->setFocus();
+
+    if(m_autoIdentification)
+    m_ircClient->sendCommand(2, COMMAND_PRIVMSG,
+                             "NickServ",
+                             QString("identify %1").arg(m_nickServPassword).toStdString().c_str());
+}
+
+void IRCWidget::showPrivateMessage(const char *nick, const char *destination, const char *message) {
+    Q_UNUSED(destination);
+    QString msg(message);
+    if(msg.contains(m_ircClient->nickInUse())) {
+        msg = QString("<font color=\"#990000\"><b>%1:</b> %2</font>").arg(nick).arg(msg);
+    } else {
+        msg = QString("<font color=\"%3\"><b>%1:</b> %2</font>").arg(nick).arg(msg).arg(getAlternatingColor());
+    }
+    m_chatWindow->append(msg);
+}
+
+void IRCWidget::showNotice(const char *nick, const char *destination, const char *message) {
+    Q_UNUSED(nick);
+    Q_UNUSED(destination);
+    m_chatWindow->append(QString("<font color=\"#007700\">%1</font>").arg(message));
+}
+
+void IRCWidget::showTopic(const char *nick, const char *channel, const char *message) {
+    m_chatWindow->append(QString("Topic for %2 was set by %1: %3").arg(nick).arg(channel).arg(message));
+}
+
+void IRCWidget::showNickChange(const char *oldNick, const char *newNick) {
+    m_chatWindow->append(QString("%1 is now known as %2.").arg(oldNick).arg(newNick));
+    m_nickList.removeAll(QString(oldNick));
+    m_nickList.append(QString(newNick));
+}
+
+void IRCWidget::nickPopup() {
+    bool ok;
+    QString newNick = QInputDialog::getText(this, QString("Nickname"), QString("Type in your nickname:"),
+                           QLineEdit::Normal, m_ircClient->nickInUse(), &ok);
+    if(ok) {
+        m_ircClient->sendNickChange(newNick);
+    }
+}
+
+void IRCWidget::showJoin(const char *nick, const char *channel) {
+    m_chatWindow->append(QString("<i>%1 has joined %2.</i>").arg(nick).arg(channel));
+}
+
+void IRCWidget::showQuit(const char *nick, const char *reason) {
+    m_chatWindow->append(QString("<i>%1 has quit.(%2).</i>").arg(nick).arg(reason));
+}
+
+void IRCWidget::sendMessage(QString message) {
+    // Do not send empty messages.
+    if(message.isEmpty())
+        return;
+
+    // Remove trailing spaces.
+    while(message.at(0).isSpace()) message.remove(0, 1);
+    if(message.startsWith("/")) {
+        QStringList line = message.split(QRegExp("\\s+"), QString::SkipEmptyParts);
+        if(line.at(0) == "/join") {
+            m_ircClient->joinChannel(line.at(1));
+        } else if(line.at(0) == "/nick") {
+            m_ircClient->sendNickChange(line.at(1));
+        } else if(line.at(0) == "/msg") {
+            QString recipient = line.at(1);
+            // Since we splitted the message before, we have to glue it together again.
+            QString pmsg = "";
+            for(int i=2; i < line.length(); i++) {
+                pmsg += line.at(i);
+                pmsg += " ";
+            }
+            m_ircClient->sendCommand(2, COMMAND_PRIVMSG,
+                                     recipient.toStdString().c_str(),
+                                     pmsg.toStdString().c_str());
+        }
+    } else {
+        m_ircClient->sendPublicMessage(message);
+        m_chatWindow->append(QString("<b>%1:</b> %2").arg(m_ircClient->nickInUse()).arg(message));
+    }
+}
+
+void IRCWidget::sendInputLine() {
+    sendMessage(m_inputLine->text());
+    m_inputLine->setText("");
+}
+
+void IRCWidget::handleNickInUseChanged() {
+    m_nickButton->setText(m_ircClient->nickInUse());
+    QSettings settings(m_settingsFile, QSettings::IniFormat);
+    settings.setValue("IRCNick", m_ircClient->nickInUse());
+}
+
+void IRCWidget::handleReplyCode(IRCEvent *event) {
+    QSettings settings(m_settingsFile, QSettings::IniFormat);
+
+    switch(event->getNumeric()) {
+    case RPL_MOTDSTART:
+    case RPL_MOTD:
+    case ERR_NOMOTD:
+    case RPL_ENDOFMOTD:
+        if(settings.value("showMessageOfTheDay").toBool())
+            m_chatWindow->append(QString("<font color=\"#777777\">%1</font>").arg(event->getParam(1)));
+        break;
+    case RPL_NOTOPIC:
+    case RPL_TOPIC:
+        if(settings.value("showTopic").toBool())
+            m_chatWindow->append(QString("<font color=\"#000088\"><b>%1</b></font>").arg(event->getParam(2)));
+        break;
+    case RPL_NAMREPLY:
+        m_chatWindow->append(QString("<font color=\"#000088\">Users online: %1</font>").arg(event->getParam(3)));
+        m_nickList = event->getParam(3).split(QRegExp("\\s+"), QString::SkipEmptyParts);
+        updateNickCompleter();
+        break;
+    case ERR_NICKNAMEINUSE:
+    case ERR_NICKCOLLISION:
+        m_chatWindow->append(QString("<font color=\"#AA0000\">Nickname in use.</font>"));
+        break;
+    };
+}
+
+
+void IRCWidget::updateNickCompleter() {
+    QCompleter *completer = new QCompleter(m_nickList, this);
+    completer->setCompletionMode(QCompleter::InlineCompletion);
+    m_inputLine->setCompleter(completer);
+}