fix: check for Quilt as Fabric-compatible loader

launcher/InstanceImportTask.cpp

@@ -241,6 +241,7 @@ void InstanceImportTask::processFlame()
 
     QString forgeVersion;
     QString fabricVersion;
+    // TODO: is Quilt relevant here?
     for(auto &loader: pack.minecraft.modLoaders)
     {
         auto id = loader.id;

launcher/minecraft/PackProfile.cpp

@@ -970,3 +970,20 @@ void PackProfile::disableInteraction(bool disable)
         }
     }
 }
+
+ModAPI::ModLoaderType PackProfile::getModLoader()
+{
+    if (!getComponentVersion("net.minecraftforge").isEmpty())
+    {
+        return ModAPI::Forge;
+    }
+    else if (!getComponentVersion("net.fabricmc.fabric-loader").isEmpty())
+    {
+        return ModAPI::Fabric;
+    }
+    else if (!getComponentVersion("org.quiltmc.quilt-loader").isEmpty())
+    {
+        return ModAPI::Quilt;
+    }
+    return ModAPI::Any;
+}

launcher/minecraft/PackProfile.h

@@ -28,6 +28,7 @@
 #include "BaseVersion.h"
 #include "MojangDownloadInfo.h"
 #include "net/Mode.h"
+#include "modplatform/ModAPI.h"
 
 class MinecraftInstance;
 struct PackProfileData;
@@ -117,6 +118,8 @@ public:
     // todo(merged): is this the best approach
     void appendComponent(ComponentPtr component);
 
+    ModAPI::ModLoaderType getModLoader();
+
 private:
     void scheduleSave();
     bool saveIsScheduled() const;

launcher/minecraft/mod/LocalModParseTask.cpp

@@ -391,7 +391,7 @@ void LocalModParseTask::processAsZip()
         zip.close();
         return;
     }
-    else if (zip.setCurrentFile("fabric.mod.json"))
+    else if (zip.setCurrentFile("fabric.mod.json"))  // TODO: Support quilt.mod.json
     {
         if (!file.open(QIODevice::ReadOnly))
         {

launcher/modplatform/ModAPI.h

@@ -15,7 +15,7 @@ class ModAPI {
     virtual ~ModAPI() = default;
 
     // https://docs.curseforge.com/?http#tocS_ModLoaderType
-    enum ModLoaderType { Any = 0, Forge = 1, Cauldron = 2, LiteLoader = 3, Fabric = 4 };
+    enum ModLoaderType { Any = 0, Forge = 1, Cauldron = 2, LiteLoader = 3, Fabric = 4, Quilt = 5 };
 
     struct SearchArgs {
         int offset;

launcher/modplatform/flame/FlameModIndex.cpp

@@ -69,6 +69,7 @@ void FlameMod::loadIndexedPackVersions(ModPlatform::IndexedPack& pack,
         for (auto m : modules) {
             auto fname = Json::requireString(m.toObject(), "foldername");
             // FIXME: This does not work properly when a mod supports more than one mod loader, since
+            // FIXME: This also doesn't deal with Quilt mods at the moment
             // they bundle the meta files for all of them in the same arquive, even when that version
             // doesn't support the given mod loader.
             if (hasFabric) {

launcher/modplatform/modrinth/ModrinthAPI.h

@@ -55,11 +55,13 @@ class ModrinthAPI : public NetworkModAPI {
     {
         switch (modLoader) {
             case Any:
-                return "fabric, forge";
+                return "fabric, forge, quilt";
             case Forge:
                 return "forge";
             case Fabric:
                 return "fabric";
+            case Quilt:
+                return "quilt";
             default:
                 return "";
         }
@@ -67,7 +69,7 @@ class ModrinthAPI : public NetworkModAPI {
 
     inline auto validateModLoader(ModLoaderType modLoader) const -> bool
     {
-        return modLoader == Any || modLoader == Forge || modLoader == Fabric;
+        return modLoader == Any || modLoader == Forge || modLoader == Fabric || modLoader == Quilt;
     }
 
 };

launcher/ui/pages/instance/ModFolderPage.cpp

@@ -56,6 +56,8 @@
 #include "minecraft/VersionFilterData.h"
 #include "minecraft/PackProfile.h"
 
+#include "modplatform/ModAPI.h"
+
 #include "Version.h"
 #include "ui/dialogs/ProgressDialog.h"
 #include "tasks/SequentialTask.h"
@@ -388,9 +390,9 @@ void ModFolderPage::on_actionInstall_mods_triggered()
     if(m_inst->typeName() != "Minecraft"){
         return; //this is a null instance or a legacy instance
     }
-    bool hasFabric = !((MinecraftInstance *)m_inst)->getPackProfile()->getComponentVersion("net.fabricmc.fabric-loader").isEmpty();
+    QStringList modLoaders = {"net.minecraftforge", "net.fabricmc.fabric-loader", "org.quiltmc.quilt-loader"};
-    bool hasForge = !((MinecraftInstance *)m_inst)->getPackProfile()->getComponentVersion("net.minecraftforge").isEmpty();
+    auto profile = ((MinecraftInstance *)m_inst)->getPackProfile();
-    if (!hasFabric && !hasForge) {
+    if (profile->getModLoader() == ModAPI::Any) {
         QMessageBox::critical(this,tr("Error"),tr("Please install a mod loader first!"));
         return;
     }

launcher/ui/pages/modplatform/ModModel.cpp

@@ -61,14 +61,18 @@ auto ListModel::data(const QModelIndex& index, int role) const -> QVariant
 
 void ListModel::requestModVersions(ModPlatform::IndexedPack const& current)
 {
+    auto profile = (dynamic_cast<MinecraftInstance*>((dynamic_cast<ModPage*>(parent()))->m_instance))->getPackProfile();
+
     m_parent->apiProvider()->getVersions(this,
-            { current.addonId.toString(), getMineVersions(), hasFabric() ? ModAPI::ModLoaderType::Fabric : ModAPI::ModLoaderType::Forge });
+            { current.addonId.toString(), getMineVersions(), profile->getModLoader() });
 }
 
 void ListModel::performPaginatedSearch()
 {
+    auto profile = (dynamic_cast<MinecraftInstance*>((dynamic_cast<ModPage*>(parent()))->m_instance))->getPackProfile();
+
     m_parent->apiProvider()->searchMods(this,
-            { nextSearchOffset, currentSearchTerm, getSorts()[currentSort], hasFabric() ? ModAPI::Fabric : ModAPI::Forge, getMineVersions().at(0) });
+            { nextSearchOffset, currentSearchTerm, getSorts()[currentSort], profile->getModLoader(), getMineVersions().at(0) });
 }
 
 void ListModel::searchWithTerm(const QString& term, const int sort)
@@ -218,13 +222,6 @@ void ListModel::versionRequestSucceeded(QJsonDocument doc, QString addonId)
 }  // namespace ModPlatform
 
 /******** Helpers ********/
-auto ModPlatform::ListModel::hasFabric() const -> bool
-{
-    return !(dynamic_cast<MinecraftInstance*>((dynamic_cast<ModPage*>(parent()))->m_instance))
-                ->getPackProfile()
-                ->getComponentVersion("net.fabricmc.fabric-loader")
-                .isEmpty();
-}
 
 auto ModPlatform::ListModel::getMineVersions() const -> QList<QString>
 {

launcher/ui/pages/modplatform/ModModel.h

@@ -62,7 +62,6 @@ class ListModel : public QAbstractListModel {
 
     void requestLogo(QString file, QString url);
 
-    inline auto hasFabric() const -> bool;
     inline auto getMineVersions() const -> QList<QString>;
 
    protected:

launcher/ui/pages/modplatform/ModPage.cpp

@@ -136,7 +136,21 @@ void ModPage::updateModVersions()
     auto packProfile = (dynamic_cast<MinecraftInstance*>(m_instance))->getPackProfile();
 
     QString mcVersion = packProfile->getComponentVersion("net.minecraft");
-    QString loaderString = (packProfile->getComponentVersion("net.minecraftforge").isEmpty()) ? "fabric" : "forge";
+
+    QString loaderString;
+    switch (packProfile->getModLoader()) {
+        case ModAPI::Forge:
+            loaderString = "forge";
+            break;
+        case ModAPI::Fabric:
+            loaderString = "fabric";
+            break;
+        case ModAPI::Quilt:
+            loaderString = "quilt";
+            break;
+        default:
+            break;
+    }
 
     for (int i = 0; i < current.versions.size(); i++) {
         auto version = current.versions[i];