GH-2639 Add simple fabric loader installation support

api/logic/minecraft/ComponentUpdateTask.cpp

@@ -586,6 +586,15 @@ void ComponentUpdateTask::resolveDependencies(bool checkOnly)
                     {
                         component->m_version = "3.1.2";
                     }
+                    else if (add.uid == "net.fabricmc.intermediary")
+                    {
+                        auto minecraft = std::find_if(components.begin(), components.end(), [](ComponentPtr & cmp){
+                            return cmp->getID() == "net.minecraft";
+                        });
+                        if(minecraft != components.end()) {
+                            component->m_version = (*minecraft)->getVersion();
+                        }
+                    }
                 }
 // HACK HACK HACK HACK FIXME: this is a placeholder for deciding what version to use. For now, it is hardcoded.
 // ############################################################################################################

application/pages/instance/VersionPage.cpp

@@ -180,6 +180,7 @@ void VersionPage::packageCurrent(const QModelIndex &current, const QModelIndex &
 
 void VersionPage::updateVersionControls()
 {
+    ui->fabricBtn->setEnabled(true);
     ui->forgeBtn->setEnabled(true);
     ui->liteloaderBtn->setEnabled(true);
     updateButtons();
@@ -187,6 +188,7 @@ void VersionPage::updateVersionControls()
 
 void VersionPage::disableVersionControls()
 {
+    ui->fabricBtn->setEnabled(false);
     ui->forgeBtn->setEnabled(false);
     ui->liteloaderBtn->setEnabled(false);
     ui->reloadBtn->setEnabled(false);
@@ -389,6 +391,33 @@ void VersionPage::on_forgeBtn_clicked()
     }
 }
 
+void VersionPage::on_fabricBtn_clicked()
+{
+    auto vlist = ENV.metadataIndex()->get("net.fabricmc.fabric-loader");
+    if(!vlist)
+    {
+        return;
+    }
+    VersionSelectDialog vselect(vlist.get(), tr("Select Fabric Loader version"), this);
+    vselect.setEmptyString(tr("No Fabric Loader versions are currently available."));
+    vselect.setEmptyErrorString(tr("Couldn't load or download the Fabric Loader version lists!"));
+
+    auto currentVersion = m_profile->getComponentVersion("net.fabricmc.fabric-loader");
+    if(!currentVersion.isEmpty())
+    {
+        vselect.setCurrentVersion(currentVersion);
+    }
+
+    if (vselect.exec() && vselect.selectedVersion())
+    {
+        auto vsn = vselect.selectedVersion();
+        m_profile->setComponentVersion("net.fabricmc.fabric-loader", vsn->descriptor());
+        m_profile->resolve(Net::Mode::Online);
+        preselect(m_profile->rowCount(QModelIndex())-1);
+        m_container->refreshContainer();
+    }
+}
+
 void VersionPage::on_addEmptyBtn_clicked()
 {
     NewComponentDialog compdialog(QString(), QString(), this);

application/pages/instance/VersionPage.h

@@ -49,6 +49,7 @@ public:
     virtual bool shouldDisplay() const override;
 
 private slots:
+    void on_fabricBtn_clicked();
     void on_forgeBtn_clicked();
     void on_addEmptyBtn_clicked();
     void on_liteloaderBtn_clicked();

application/pages/instance/VersionPage.ui

@@ -170,6 +170,16 @@
            </property>
           </widget>
          </item>
+         <item>
+          <widget class="QPushButton" name="fabricBtn">
+           <property name="toolTip">
+            <string>Install the Minecraft Forge package.</string>
+           </property>
+           <property name="text">
+            <string>Install Fabric</string>
+           </property>
+          </widget>
+         </item>
          <item>
           <widget class="QPushButton" name="liteloaderBtn">
            <property name="toolTip">
@@ -298,6 +308,7 @@
   </customwidget>
  </customwidgets>
  <tabstops>
+  <tabstop>tabWidget</tabstop>
   <tabstop>packageView</tabstop>
   <tabstop>changeVersionBtn</tabstop>
   <tabstop>moveUpBtn</tabstop>
@@ -307,6 +318,7 @@
   <tabstop>editBtn</tabstop>
   <tabstop>revertBtn</tabstop>
   <tabstop>forgeBtn</tabstop>
+  <tabstop>fabricBtn</tabstop>
   <tabstop>liteloaderBtn</tabstop>
   <tabstop>modBtn</tabstop>
   <tabstop>jarmodBtn</tabstop>
@@ -314,7 +326,6 @@
   <tabstop>addEmptyBtn</tabstop>
   <tabstop>reloadBtn</tabstop>
   <tabstop>downloadBtn</tabstop>
-  <tabstop>tabWidget</tabstop>
  </tabstops>
  <resources/>
  <connections/>