10 files changed, 595 insertions, 471 deletions

diff --git a/launcher/ui/pages/instance/ExternalResourcesPage.cpp b/launcher/ui/pages/instance/ExternalResourcesPage.cpp
new file mode 100644
index 00000000..02eeae3d
--- /dev/null
+++ b/launcher/ui/pages/instance/ExternalResourcesPage.cpp
@@ -0,0 +1,297 @@
+#include "ExternalResourcesPage.h"
+#include "ui_ExternalResourcesPage.h"
+
+#include "DesktopServices.h"
+#include "Version.h"
+#include "minecraft/mod/ModFolderModel.h"
+#include "ui/GuiUtil.h"
+
+#include <QKeyEvent>
+#include <QMenu>
+
+namespace {
+// FIXME: wasteful
+void RemoveThePrefix(QString& string)
+{
+    QRegularExpression regex(QStringLiteral("^(?:the|teh) +"), QRegularExpression::CaseInsensitiveOption);
+    string.remove(regex);
+    string = string.trimmed();
+}
+}  // namespace
+
+class SortProxy : public QSortFilterProxyModel {
+   public:
+    explicit SortProxy(QObject* parent = nullptr) : QSortFilterProxyModel(parent) {}
+
+   protected:
+    bool filterAcceptsRow(int source_row, const QModelIndex& source_parent) const override
+    {
+        ModFolderModel* model = qobject_cast<ModFolderModel*>(sourceModel());
+        if (!model)
+            return false;
+        
+        const auto& mod = model->at(source_row);
+
+        if (mod.name().contains(filterRegExp()))
+            return true;
+        if (mod.description().contains(filterRegExp()))
+            return true;
+        
+        for (auto& author : mod.authors()) {
+            if (author.contains(filterRegExp())) {
+                return true;
+            }
+        }
+
+        return false;
+    }
+
+    bool lessThan(const QModelIndex& source_left, const QModelIndex& source_right) const override
+    {
+        ModFolderModel* model = qobject_cast<ModFolderModel*>(sourceModel());
+        if (!model || !source_left.isValid() || !source_right.isValid() || source_left.column() != source_right.column()) {
+            return QSortFilterProxyModel::lessThan(source_left, source_right);
+        }
+
+        // we are now guaranteed to have two valid indexes in the same column... we love the provided invariants unconditionally and
+        // proceed.
+
+        auto column = (ModFolderModel::Columns) source_left.column();
+        bool invert = false;
+        switch (column) {
+            // GH-2550 - sort by enabled/disabled
+            case ModFolderModel::ActiveColumn: {
+                auto dataL = source_left.data(Qt::CheckStateRole).toBool();
+                auto dataR = source_right.data(Qt::CheckStateRole).toBool();
+                if (dataL != dataR)
+                    return dataL > dataR;
+                
+                // fallthrough
+                invert = sortOrder() == Qt::DescendingOrder;
+            }
+            // GH-2722 - sort mod names in a way that discards "The" prefixes
+            case ModFolderModel::NameColumn: {
+                auto dataL = model->data(model->index(source_left.row(), ModFolderModel::NameColumn)).toString();
+                RemoveThePrefix(dataL);
+                auto dataR = model->data(model->index(source_right.row(), ModFolderModel::NameColumn)).toString();
+                RemoveThePrefix(dataR);
+
+                auto less = dataL.compare(dataR, sortCaseSensitivity());
+                if (less != 0)
+                    return invert ? (less > 0) : (less < 0);
+                
+                // fallthrough
+                invert = sortOrder() == Qt::DescendingOrder;
+            }
+            // GH-2762 - sort versions by parsing them as versions
+            case ModFolderModel::VersionColumn: {
+                auto dataL = Version(model->data(model->index(source_left.row(), ModFolderModel::VersionColumn)).toString());
+                auto dataR = Version(model->data(model->index(source_right.row(), ModFolderModel::VersionColumn)).toString());
+                return invert ? (dataL > dataR) : (dataL < dataR);
+            }
+            default: {
+                return QSortFilterProxyModel::lessThan(source_left, source_right);
+            }
+        }
+    }
+};
+
+ExternalResourcesPage::ExternalResourcesPage(BaseInstance* instance, std::shared_ptr<ModFolderModel> model, QWidget* parent)
+    : QMainWindow(parent), m_instance(instance), ui(new Ui::ExternalResourcesPage), m_model(model)
+{
+    ui->setupUi(this);
+
+    runningStateChanged(m_instance && m_instance->isRunning());
+
+    ui->actionsToolbar->insertSpacer(ui->actionViewConfigs);
+
+    m_filterModel = new SortProxy(this);
+    m_filterModel->setDynamicSortFilter(true);
+    m_filterModel->setFilterCaseSensitivity(Qt::CaseInsensitive);
+    m_filterModel->setSortCaseSensitivity(Qt::CaseInsensitive);
+    m_filterModel->setSourceModel(m_model.get());
+    m_filterModel->setFilterKeyColumn(-1);
+    ui->treeView->setModel(m_filterModel);
+
+    ui->treeView->installEventFilter(this);
+    ui->treeView->sortByColumn(1, Qt::AscendingOrder);
+    ui->treeView->setContextMenuPolicy(Qt::CustomContextMenu);
+
+    // The default function names by Qt are pretty ugly, so let's just connect the actions manually,
+    // to make it easier to read :)
+    connect(ui->actionAddItem, &QAction::triggered, this, &ExternalResourcesPage::addItem);
+    connect(ui->actionRemoveItem, &QAction::triggered, this, &ExternalResourcesPage::removeItem);
+    connect(ui->actionEnableItem, &QAction::triggered, this, &ExternalResourcesPage::enableItem);
+    connect(ui->actionDisableItem, &QAction::triggered, this, &ExternalResourcesPage::disableItem);
+    connect(ui->actionViewConfigs, &QAction::triggered, this, &ExternalResourcesPage::viewConfigs);
+    connect(ui->actionViewFolder, &QAction::triggered, this, &ExternalResourcesPage::viewFolder);
+
+    connect(ui->treeView, &ModListView::customContextMenuRequested, this, &ExternalResourcesPage::ShowContextMenu);
+    connect(ui->treeView, &ModListView::activated, this, &ExternalResourcesPage::itemActivated);
+
+    auto selection_model = ui->treeView->selectionModel();
+    connect(selection_model, &QItemSelectionModel::currentChanged, this, &ExternalResourcesPage::current);
+    connect(ui->filterEdit, &QLineEdit::textChanged, this, &ExternalResourcesPage::filterTextChanged);
+    connect(m_instance, &BaseInstance::runningStatusChanged, this, &ExternalResourcesPage::runningStateChanged);
+}
+
+ExternalResourcesPage::~ExternalResourcesPage()
+{
+    m_model->stopWatching();
+    delete ui;
+}
+
+void ExternalResourcesPage::itemActivated(const QModelIndex&)
+{
+    if (!m_controlsEnabled)
+        return;
+    
+    auto selection = m_filterModel->mapSelectionToSource(ui->treeView->selectionModel()->selection());
+    m_model->setModStatus(selection.indexes(), ModFolderModel::Toggle);
+}
+
+QMenu* ExternalResourcesPage::createPopupMenu()
+{
+    QMenu* filteredMenu = QMainWindow::createPopupMenu();
+    filteredMenu->removeAction(ui->actionsToolbar->toggleViewAction());
+    return filteredMenu;
+}
+
+void ExternalResourcesPage::ShowContextMenu(const QPoint& pos)
+{
+    auto menu = ui->actionsToolbar->createContextMenu(this, tr("Context menu"));
+    menu->exec(ui->treeView->mapToGlobal(pos));
+    delete menu;
+}
+
+void ExternalResourcesPage::openedImpl()
+{
+    m_model->startWatching();
+}
+
+void ExternalResourcesPage::closedImpl()
+{
+    m_model->stopWatching();
+}
+
+void ExternalResourcesPage::retranslate()
+{
+    ui->retranslateUi(this);
+}
+
+void ExternalResourcesPage::filterTextChanged(const QString& newContents)
+{
+    m_viewFilter = newContents;
+    m_filterModel->setFilterFixedString(m_viewFilter);
+}
+
+void ExternalResourcesPage::runningStateChanged(bool running)
+{
+    if (m_controlsEnabled == !running)
+        return;
+    
+    m_controlsEnabled = !running;
+    ui->actionAddItem->setEnabled(m_controlsEnabled);
+    ui->actionDisableItem->setEnabled(m_controlsEnabled);
+    ui->actionEnableItem->setEnabled(m_controlsEnabled);
+    ui->actionRemoveItem->setEnabled(m_controlsEnabled);
+}
+
+bool ExternalResourcesPage::shouldDisplay() const
+{
+    return true;
+}
+
+bool ExternalResourcesPage::listFilter(QKeyEvent* keyEvent)
+{
+    switch (keyEvent->key()) {
+        case Qt::Key_Delete:
+            removeItem();
+            return true;
+        case Qt::Key_Plus:
+            addItem();
+            return true;
+        default:
+            break;
+    }
+    return QWidget::eventFilter(ui->treeView, keyEvent);
+}
+
+bool ExternalResourcesPage::eventFilter(QObject* obj, QEvent* ev)
+{
+    if (ev->type() != QEvent::KeyPress)
+        return QWidget::eventFilter(obj, ev);
+    
+    QKeyEvent* keyEvent = static_cast<QKeyEvent*>(ev);
+    if (obj == ui->treeView)
+        return listFilter(keyEvent);
+
+    return QWidget::eventFilter(obj, ev);
+}
+
+void ExternalResourcesPage::addItem()
+{
+    if (!m_controlsEnabled)
+        return;
+    
+
+    auto list = GuiUtil::BrowseForFiles(
+        helpPage(), tr("Select %1", "Select whatever type of files the page contains. Example: 'Loader Mods'").arg(displayName()),
+        m_fileSelectionFilter.arg(displayName()), APPLICATION->settings()->get("CentralModsDir").toString(), this->parentWidget());
+
+    if (!list.isEmpty()) {
+        for (auto filename : list) {
+            m_model->installMod(filename);
+        }
+    }
+}
+
+void ExternalResourcesPage::removeItem()
+{
+    if (!m_controlsEnabled)
+        return;
+    
+    auto selection = m_filterModel->mapSelectionToSource(ui->treeView->selectionModel()->selection());
+    m_model->deleteMods(selection.indexes());
+}
+
+void ExternalResourcesPage::enableItem()
+{
+    if (!m_controlsEnabled)
+        return;
+    
+    auto selection = m_filterModel->mapSelectionToSource(ui->treeView->selectionModel()->selection());
+    m_model->setModStatus(selection.indexes(), ModFolderModel::Enable);
+}
+
+void ExternalResourcesPage::disableItem()
+{
+    if (!m_controlsEnabled)
+        return;
+    
+    auto selection = m_filterModel->mapSelectionToSource(ui->treeView->selectionModel()->selection());
+    m_model->setModStatus(selection.indexes(), ModFolderModel::Disable);
+}
+
+void ExternalResourcesPage::viewConfigs()
+{
+    DesktopServices::openDirectory(m_instance->instanceConfigFolder(), true);
+}
+
+void ExternalResourcesPage::viewFolder()
+{
+    DesktopServices::openDirectory(m_model->dir().absolutePath(), true);
+}
+
+void ExternalResourcesPage::current(const QModelIndex& current, const QModelIndex& previous)
+{
+    if (!current.isValid()) {
+        ui->frame->clear();
+        return;
+    }
+
+    auto sourceCurrent = m_filterModel->mapToSource(current);
+    int row = sourceCurrent.row();
+    Mod& m = m_model->operator[](row);
+    ui->frame->updateWithMod(m);
+}
diff --git a/launcher/ui/pages/instance/ExternalResourcesPage.h b/launcher/ui/pages/instance/ExternalResourcesPage.h
new file mode 100644
index 00000000..41237139
--- /dev/null
+++ b/launcher/ui/pages/instance/ExternalResourcesPage.h
@@ -0,0 +1,73 @@
+#pragma once
+
+#include <QMainWindow>
+#include <QSortFilterProxyModel>
+
+#include "Application.h"
+#include "minecraft/MinecraftInstance.h"
+#include "ui/pages/BasePage.h"
+
+class ModFolderModel;
+
+namespace Ui {
+class ExternalResourcesPage;
+}
+
+/* This page is used as a base for pages in which the user can manage external resources
+ * related to the game, such as mods, shaders or resource packs. */
+class ExternalResourcesPage : public QMainWindow, public BasePage {
+    Q_OBJECT
+
+   public:
+    // FIXME: Switch to different model (or change the name of this one)
+    explicit ExternalResourcesPage(BaseInstance* instance, std::shared_ptr<ModFolderModel> model, QWidget* parent = nullptr);
+    virtual ~ExternalResourcesPage();
+
+    virtual QString displayName() const override = 0;
+    virtual QIcon icon() const override = 0;
+    virtual QString id() const override = 0;
+    virtual QString helpPage() const override = 0;
+
+    virtual bool shouldDisplay() const override = 0;
+
+    void openedImpl() override;
+    void closedImpl() override;
+
+    void retranslate() override;
+
+   protected:
+    bool eventFilter(QObject* obj, QEvent* ev) override;
+    bool listFilter(QKeyEvent* ev);
+    QMenu* createPopupMenu() override;
+
+   public slots:
+    void current(const QModelIndex& current, const QModelIndex& previous);
+
+   protected slots:
+    void itemActivated(const QModelIndex& index);
+    void filterTextChanged(const QString& newContents);
+    void runningStateChanged(bool running);
+
+    virtual void addItem();
+    virtual void removeItem();
+
+    virtual void enableItem();
+    virtual void disableItem();
+
+    virtual void viewFolder();
+    virtual void viewConfigs();
+
+    void ShowContextMenu(const QPoint& pos);
+
+   protected:
+    BaseInstance* m_instance = nullptr;
+
+    Ui::ExternalResourcesPage* ui = nullptr;
+    std::shared_ptr<ModFolderModel> m_model;
+    QSortFilterProxyModel* m_filterModel = nullptr;
+
+    QString m_fileSelectionFilter;
+    QString m_viewFilter;
+
+    bool m_controlsEnabled = true;
+};
diff --git a/launcher/ui/pages/instance/ModFolderPage.ui b/launcher/ui/pages/instance/ExternalResourcesPage.ui
index ab59b0df..17bf455a 100644
--- a/launcher/ui/pages/instance/ModFolderPage.ui
+++ b/launcher/ui/pages/instance/ExternalResourcesPage.ui
@@ -1,7 +1,7 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <ui version="4.0">
- <class>ModFolderPage</class>
- <widget class="QMainWindow" name="ModFolderPage">
+ <class>ExternalResourcesPage</class>
+ <widget class="QMainWindow" name="ExternalResourcesPage">
   <property name="geometry">
    <rect>
     <x>0</x>
@@ -53,7 +53,7 @@
      </widget>
     </item>
     <item row="1" column="1" colspan="3">
-     <widget class="ModListView" name="modTreeView">
+     <widget class="ModListView" name="treeView">
       <property name="sizePolicy">
        <sizepolicy hsizetype="Expanding" vsizetype="Expanding">
         <horstretch>0</horstretch>
@@ -83,15 +83,15 @@
    <attribute name="toolBarBreak">
     <bool>false</bool>
    </attribute>
-   <addaction name="actionAdd"/>
+   <addaction name="actionAddItem"/>
    <addaction name="separator"/>
-   <addaction name="actionRemove"/>
-   <addaction name="actionEnable"/>
-   <addaction name="actionDisable"/>
-   <addaction name="actionView_configs"/>
-   <addaction name="actionView_Folder"/>
+   <addaction name="actionRemoveItem"/>
+   <addaction name="actionEnableItem"/>
+   <addaction name="actionDisableItem"/>
+   <addaction name="actionViewConfigs"/>
+   <addaction name="actionViewFolder"/>
   </widget>
-  <action name="actionAdd">
+  <action name="actionAddItem">
    <property name="text">
     <string>&amp;Add</string>
    </property>
@@ -99,31 +99,31 @@
     <string>Add</string>
    </property>
   </action>
-  <action name="actionRemove">
+  <action name="actionRemoveItem">
    <property name="text">
     <string>&amp;Remove</string>
    </property>
    <property name="toolTip">
-    <string>Remove selected mods</string>
+    <string>Remove selected item</string>
    </property>
   </action>
-  <action name="actionEnable">
+  <action name="actionEnableItem">
    <property name="text">
     <string>&amp;Enable</string>
    </property>
    <property name="toolTip">
-    <string>Enable selected mods</string>
+    <string>Enable selected item</string>
    </property>
   </action>
-  <action name="actionDisable">
+  <action name="actionDisableItem">
    <property name="text">
     <string>&amp;Disable</string>
    </property>
    <property name="toolTip">
-    <string>Disable selected mods</string>
+    <string>Disable selected item</string>
    </property>
   </action>
-  <action name="actionView_configs">
+  <action name="actionViewConfigs">
    <property name="text">
     <string>View &amp;Configs</string>
    </property>
@@ -131,11 +131,22 @@
     <string>Open the 'config' folder in the system file manager.</string>
    </property>
   </action>
-  <action name="actionView_Folder">
+  <action name="actionViewFolder">
    <property name="text">
     <string>View &amp;Folder</string>
    </property>
   </action>
+  <action name="actionDownloadItem">
+   <property name="enabled">
+    <bool>false</bool>
+   </property>
+   <property name="text">
+    <string>&amp;Download</string>
+   </property>
+   <property name="toolTip">
+    <string>Download a new resource</string>
+   </property>
+  </action>
  </widget>
  <customwidgets>
   <customwidget>
@@ -156,7 +167,7 @@
   </customwidget>
  </customwidgets>
  <tabstops>
-  <tabstop>modTreeView</tabstop>
+  <tabstop>treeView</tabstop>
   <tabstop>filterEdit</tabstop>
  </tabstops>
  <resources/>
diff --git a/launcher/ui/pages/instance/InstanceSettingsPage.cpp b/launcher/ui/pages/instance/InstanceSettingsPage.cpp
index b4562843..1d8cd1d7 100644
--- a/launcher/ui/pages/instance/InstanceSettingsPage.cpp
+++ b/launcher/ui/pages/instance/InstanceSettingsPage.cpp
@@ -50,6 +50,7 @@
 #include "Application.h"
 
 #include "java/JavaInstallList.h"
+#include "java/JavaUtils.h"
 #include "FileSystem.h"
 
 
@@ -232,6 +233,22 @@ void InstanceSettingsPage::applySettings()
         m_settings->reset("UseNativeGLFW");
     }
 
+    // Performance
+    bool performance = ui->perfomanceGroupBox->isChecked();
+    m_settings->set("OverridePerformance", performance);
+    if(performance)
+    {
+        m_settings->set("EnableFeralGamemode", ui->enableFeralGamemodeCheck->isChecked());
+        m_settings->set("EnableMangoHud", ui->enableMangoHud->isChecked());
+        m_settings->set("UseDiscreteGpu", ui->useDiscreteGpuCheck->isChecked());
+    }
+    else
+    {
+        m_settings->reset("EnableFeralGamemode");
+        m_settings->reset("EnableMangoHud");
+        m_settings->reset("UseDiscreteGpu");
+    }
+
     // Game time
     bool gameTime = ui->gameTimeGroupBox->isChecked();
     m_settings->set("OverrideGameTime", gameTime);
@@ -325,6 +342,16 @@ void InstanceSettingsPage::loadSettings()
     ui->useNativeGLFWCheck->setChecked(m_settings->get("UseNativeGLFW").toBool());
     ui->useNativeOpenALCheck->setChecked(m_settings->get("UseNativeOpenAL").toBool());
 
+    // Performance
+    ui->perfomanceGroupBox->setChecked(m_settings->get("OverridePerformance").toBool());
+    ui->enableFeralGamemodeCheck->setChecked(m_settings->get("EnableFeralGamemode").toBool());
+    ui->enableMangoHud->setChecked(m_settings->get("EnableMangoHud").toBool());
+    ui->useDiscreteGpuCheck->setChecked(m_settings->get("UseDiscreteGpu").toBool());
+
+    #if !defined(Q_OS_LINUX)
+    ui->perfomanceGroupBox->setVisible(false);
+    #endif
+
     // Miscellanous
     ui->gameTimeGroupBox->setChecked(m_settings->get("OverrideGameTime").toBool());
     ui->showGameTime->setChecked(m_settings->get("ShowGameTime").toBool());
@@ -336,6 +363,11 @@ void InstanceSettingsPage::loadSettings()
 
 void InstanceSettingsPage::on_javaDetectBtn_clicked()
 {
+    if (JavaUtils::getJavaCheckPath().isEmpty()) {
+        JavaCommon::javaCheckNotFound(this);
+        return;
+    }
+
     JavaInstallPtr java;
 
     VersionSelectDialog vselect(APPLICATION->javalist().get(), tr("Select a Java version"), this, true);
diff --git a/launcher/ui/pages/instance/InstanceSettingsPage.ui b/launcher/ui/pages/instance/InstanceSettingsPage.ui
index cb66b3ce..8b3c3370 100644
--- a/launcher/ui/pages/instance/InstanceSettingsPage.ui
+++ b/launcher/ui/pages/instance/InstanceSettingsPage.ui
@@ -455,6 +455,74 @@
        </item>
       </layout>
      </widget>
+     <widget class="QWidget" name="performancePage">
+      <attribute name="title">
+       <string>Performance</string>
+      </attribute>
+      <layout class="QVBoxLayout" name="verticalLayout_14">
+       <item>
+        <widget class="QGroupBox" name="perfomanceGroupBox">
+         <property name="enabled">
+          <bool>true</bool>
+         </property>
+         <property name="title">
+          <string>Performance</string>
+         </property>
+         <property name="checkable">
+          <bool>true</bool>
+         </property>
+         <property name="checked">
+          <bool>false</bool>
+         </property>
+         <layout class="QVBoxLayout" name="verticalLayout_13">
+          <item>
+           <widget class="QCheckBox" name="enableFeralGamemodeCheck">
+            <property name="toolTip">
+             <string>&lt;html&gt;&lt;head/&gt;&lt;body&gt;&lt;p&gt;Enable Feral Interactive's GameMode, to potentially improve gaming performance.&lt;/p&gt;&lt;/body&gt;&lt;/html&gt;</string>
+            </property>
+            <property name="text">
+             <string>Enable Feral GameMode</string>
+            </property>
+           </widget>
+          </item>
+          <item>
+           <widget class="QCheckBox" name="enableMangoHud">
+            <property name="toolTip">
+             <string>&lt;html&gt;&lt;head/&gt;&lt;body&gt;&lt;p&gt;Enable MangoHud's advanced performance overlay.&lt;/p&gt;&lt;/body&gt;&lt;/html&gt;</string>
+            </property>
+            <property name="text">
+             <string>Enable MangoHud</string>
+            </property>
+           </widget>
+          </item>
+          <item>
+           <widget class="QCheckBox" name="useDiscreteGpuCheck">
+            <property name="toolTip">
+             <string>&lt;html&gt;&lt;head/&gt;&lt;body&gt;&lt;p&gt;Use the discrete GPU instead of the primary GPU.&lt;/p&gt;&lt;/body&gt;&lt;/html&gt;</string>
+            </property>
+            <property name="text">
+             <string>Use discrete GPU</string>
+            </property>
+           </widget>
+          </item>
+         </layout>
+        </widget>
+       </item>
+       <item>
+        <spacer name="verticalSpacer_2">
+         <property name="orientation">
+          <enum>Qt::Vertical</enum>
+         </property>
+         <property name="sizeHint" stdset="0">
+          <size>
+           <width>20</width>
+           <height>40</height>
+          </size>
+         </property>
+        </spacer>
+       </item>
+      </layout>
+     </widget>
      <widget class="QWidget" name="miscellaneousPage">
       <attribute name="title">
        <string>Miscellaneous</string>
diff --git a/launcher/ui/pages/instance/ModFolderPage.cpp b/launcher/ui/pages/instance/ModFolderPage.cpp
index d929a0ea..4432ccc8 100644
--- a/launcher/ui/pages/instance/ModFolderPage.cpp
+++ b/launcher/ui/pages/instance/ModFolderPage.cpp
@@ -35,370 +35,99 @@
  */
 
 #include "ModFolderPage.h"
-#include "ui_ModFolderPage.h"
+#include "ui_ExternalResourcesPage.h"
 
-#include <QMessageBox>
+#include <QAbstractItemModel>
 #include <QEvent>
 #include <QKeyEvent>
-#include <QAbstractItemModel>
 #include <QMenu>
+#include <QMessageBox>
 #include <QSortFilterProxyModel>
 
 #include "Application.h"
 
+#include "ui/GuiUtil.h"
 #include "ui/dialogs/CustomMessageBox.h"
 #include "ui/dialogs/ModDownloadDialog.h"
-#include "ui/GuiUtil.h"
 
 #include "DesktopServices.h"
 
-#include "minecraft/mod/ModFolderModel.h"
-#include "minecraft/mod/Mod.h"
-#include "minecraft/VersionFilterData.h"
 #include "minecraft/PackProfile.h"
+#include "minecraft/VersionFilterData.h"
+#include "minecraft/mod/Mod.h"
+#include "minecraft/mod/ModFolderModel.h"
 
 #include "modplatform/ModAPI.h"
 
 #include "Version.h"
+#include "tasks/ConcurrentTask.h"
 #include "ui/dialogs/ProgressDialog.h"
-#include "tasks/SequentialTask.h"
-
-namespace {
-    // FIXME: wasteful
-    void RemoveThePrefix(QString & string) {
-        QRegularExpression regex(QStringLiteral("^(([Tt][Hh][eE])|([Tt][eE][Hh])) +"));
-        string.remove(regex);
-        string = string.trimmed();
-    }
-}
-
-class ModSortProxy : public QSortFilterProxyModel
-{
-public:
-    explicit ModSortProxy(QObject *parent = 0) : QSortFilterProxyModel(parent)
-    {
-    }
-
-protected:
-    bool filterAcceptsRow(int source_row, const QModelIndex & source_parent) const override {
-        ModFolderModel *model = qobject_cast<ModFolderModel *>(sourceModel());
-        if(!model) {
-            return false;
-        }
-        const auto &mod = model->at(source_row);
-        if(mod.name().contains(filterRegExp())) {
-            return true;
-        }
-        if(mod.description().contains(filterRegExp())) {
-            return true;
-        }
-        for(auto & author: mod.authors()) {
-            if (author.contains(filterRegExp())) {
-                return true;
-            }
-        }
-        return false;
-    }
-
-    bool lessThan(const QModelIndex & source_left, const QModelIndex & source_right) const override
-    {
-        ModFolderModel *model = qobject_cast<ModFolderModel *>(sourceModel());
-        if(
-            !model ||
-            !source_left.isValid() ||
-            !source_right.isValid() ||
-            source_left.column() != source_right.column()
-        ) {
-            return QSortFilterProxyModel::lessThan(source_left, source_right);
-        }
-
-        // we are now guaranteed to have two valid indexes in the same column... we love the provided invariants unconditionally and proceed.
 
-        auto column = (ModFolderModel::Columns) source_left.column();
-        bool invert = false;
-        switch(column) {
-            // GH-2550 - sort by enabled/disabled
-            case ModFolderModel::ActiveColumn: {
-                auto dataL = source_left.data(Qt::CheckStateRole).toBool();
-                auto dataR = source_right.data(Qt::CheckStateRole).toBool();
-                if(dataL != dataR) {
-                    return dataL > dataR;
-                }
-                // fallthrough
-                invert = sortOrder() == Qt::DescendingOrder;
-            }
-            // GH-2722 - sort mod names in a way that discards "The" prefixes
-            case ModFolderModel::NameColumn: {
-                auto dataL = model->data(model->index(source_left.row(), ModFolderModel::NameColumn)).toString();
-                RemoveThePrefix(dataL);
-                auto dataR = model->data(model->index(source_right.row(), ModFolderModel::NameColumn)).toString();
-                RemoveThePrefix(dataR);
-
-                auto less = dataL.compare(dataR, sortCaseSensitivity());
-                if(less != 0) {
-                    return invert ? (less > 0) : (less < 0);
-                }
-                // fallthrough
-                invert = sortOrder() == Qt::DescendingOrder;
-            }
-            // GH-2762 - sort versions by parsing them as versions
-            case ModFolderModel::VersionColumn: {
-                auto dataL = Version(model->data(model->index(source_left.row(), ModFolderModel::VersionColumn)).toString());
-                auto dataR = Version(model->data(model->index(source_right.row(), ModFolderModel::VersionColumn)).toString());
-                return invert ? (dataL > dataR) : (dataL < dataR);
-            }
-            default: {
-                return QSortFilterProxyModel::lessThan(source_left, source_right);
-            }
-        }
-    }
-};
-
-ModFolderPage::ModFolderPage(
-    BaseInstance *inst,
-    std::shared_ptr<ModFolderModel> mods,
-    QString id,
-    QString iconName,
-    QString displayName,
-    QString helpPage,
-    QWidget *parent
-) :
-    QMainWindow(parent),
-    ui(new Ui::ModFolderPage)
+ModFolderPage::ModFolderPage(BaseInstance* inst, std::shared_ptr<ModFolderModel> mods, QWidget* parent)
+    : ExternalResourcesPage(inst, mods, parent)
 {
-    ui->setupUi(this);
-
     // This is structured like that so that these changes
-    // do not affect the Resouce pack and Shader pack tabs
-    if(id == "mods") {
-        auto act = new QAction(tr("Download mods"), this);
-        act->setToolTip(tr("Download mods from online mod platforms"));
-        ui->actionsToolbar->insertActionBefore(ui->actionAdd, act);
-        connect(act, &QAction::triggered, this, &ModFolderPage::on_actionInstall_mods_triggered);
-
-        ui->actionAdd->setText(tr("Add .jar"));
-        ui->actionAdd->setToolTip(tr("Add mods via local file"));
-    }
-
-    ui->actionsToolbar->insertSpacer(ui->actionView_configs);
-
-    m_inst = inst;
-    on_RunningState_changed(m_inst && m_inst->isRunning());
-    m_mods = mods;
-    m_id = id;
-    m_displayName = displayName;
-    m_iconName = iconName;
-    m_helpName = helpPage;
-    m_fileSelectionFilter = "%1 (*.zip *.jar)";
-    m_filterModel = new ModSortProxy(this);
-    m_filterModel->setDynamicSortFilter(true);
-    m_filterModel->setFilterCaseSensitivity(Qt::CaseInsensitive);
-    m_filterModel->setSortCaseSensitivity(Qt::CaseInsensitive);
-    m_filterModel->setSourceModel(m_mods.get());
-    m_filterModel->setFilterKeyColumn(-1);
-    ui->modTreeView->setModel(m_filterModel);
-    ui->modTreeView->installEventFilter(this);
-    ui->modTreeView->sortByColumn(1, Qt::AscendingOrder);
-    ui->modTreeView->setContextMenuPolicy(Qt::CustomContextMenu);
-    connect(ui->modTreeView, &ModListView::customContextMenuRequested, this, &ModFolderPage::ShowContextMenu);
-    connect(ui->modTreeView, &ModListView::activated, this, &ModFolderPage::modItemActivated);
+    // do not affect the Resource pack and Shader pack tabs
+    {
+        ui->actionDownloadItem->setText(tr("Download mods"));
+        ui->actionDownloadItem->setToolTip(tr("Download mods from online mod platforms"));
+        ui->actionDownloadItem->setEnabled(true);
+        ui->actionAddItem->setText(tr("Add file"));
+        ui->actionAddItem->setToolTip(tr("Add a locally downloaded file"));
 
-    auto smodel = ui->modTreeView->selectionModel();
-    connect(smodel, &QItemSelectionModel::currentChanged, this, &ModFolderPage::modCurrent);
-    connect(ui->filterEdit, &QLineEdit::textChanged, this, &ModFolderPage::on_filterTextChanged);
-    connect(m_inst, &BaseInstance::runningStatusChanged, this, &ModFolderPage::on_RunningState_changed);
-}
+        ui->actionsToolbar->insertActionBefore(ui->actionAddItem, ui->actionDownloadItem);
 
-void ModFolderPage::modItemActivated(const QModelIndex&)
-{
-    if(!m_controlsEnabled) {
-        return;
+        connect(ui->actionDownloadItem, &QAction::triggered, this, &ModFolderPage::installMods);
     }
-    auto selection = m_filterModel->mapSelectionToSource(ui->modTreeView->selectionModel()->selection());
-    m_mods->setModStatus(selection.indexes(), ModFolderModel::Toggle);
-}
-
-QMenu * ModFolderPage::createPopupMenu()
-{
-    QMenu* filteredMenu = QMainWindow::createPopupMenu();
-    filteredMenu->removeAction(ui->actionsToolbar->toggleViewAction() );
-    return filteredMenu;
 }
 
-void ModFolderPage::ShowContextMenu(const QPoint& pos)
-{
-    auto menu = ui->actionsToolbar->createContextMenu(this, tr("Context menu"));
-    menu->exec(ui->modTreeView->mapToGlobal(pos));
-    delete menu;
-}
-
-void ModFolderPage::openedImpl()
-{
-    m_mods->startWatching();
-}
-
-void ModFolderPage::closedImpl()
-{
-    m_mods->stopWatching();
-}
-
-void ModFolderPage::on_filterTextChanged(const QString& newContents)
-{
-    m_viewFilter = newContents;
-    m_filterModel->setFilterFixedString(m_viewFilter);
-}
-
-
-CoreModFolderPage::CoreModFolderPage(BaseInstance *inst, std::shared_ptr<ModFolderModel> mods,
-                                     QString id, QString iconName, QString displayName,
-                                     QString helpPage, QWidget *parent)
-    : ModFolderPage(inst, mods, id, iconName, displayName, helpPage, parent)
-{