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diff --git a/api/logic/InstanceList.h b/api/logic/InstanceList.h
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+++ b/api/logic/InstanceList.h
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+/* Copyright 2013-2015 MultiMC Contributors
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#pragma once
+
+#include <QObject>
+#include <QAbstractListModel>
+#include <QSet>
+
+#include "BaseInstance.h"
+
+#include "multimc_logic_export.h"
+
+class BaseInstance;
+class QDir;
+
+class MULTIMC_LOGIC_EXPORT InstanceList : public QAbstractListModel
+{
+	Q_OBJECT
+private:
+	void loadGroupList(QMap<QString, QString> &groupList);
+	void suspendGroupSaving();
+	void resumeGroupSaving();
+
+public slots:
+	void saveGroupList();
+
+public:
+	explicit InstanceList(SettingsObjectPtr globalSettings, const QString &instDir, QObject *parent = 0);
+	virtual ~InstanceList();
+
+public:
+	QModelIndex index(int row, int column = 0, const QModelIndex &parent = QModelIndex()) const;
+	int rowCount(const QModelIndex &parent = QModelIndex()) const;
+	QVariant data(const QModelIndex &index, int role) const;
+	Qt::ItemFlags flags(const QModelIndex &index) const;
+
+	enum AdditionalRoles
+	{
+		GroupRole = Qt::UserRole,
+		InstancePointerRole = 0x34B1CB48, ///< Return pointer to real instance
+		InstanceIDRole = 0x34B1CB49 ///< Return id if the instance
+	};
+	/*!
+	 * \brief Error codes returned by functions in the InstanceList class.
+	 * NoError Indicates that no error occurred.
+	 * UnknownError indicates that an unspecified error occurred.
+	 */
+	enum InstListError
+	{
+		NoError = 0,
+		UnknownError
+	};
+
+	enum InstLoadError
+	{
+		NoLoadError = 0,
+		UnknownLoadError,
+		NotAnInstance
+	};
+
+	enum InstCreateError
+	{
+		NoCreateError = 0,
+		NoSuchVersion,
+		UnknownCreateError,
+		InstExists,
+		CantCreateDir
+	};
+
+	QString instDir() const
+	{
+		return m_instDir;
+	}
+
+	/*!
+	 * \brief Get the instance at index
+	 */
+	InstancePtr at(int i) const
+	{
+		return m_instances.at(i);
+	}
+	;
+
+	/*!
+	 * \brief Get the count of loaded instances
+	 */
+	int count() const
+	{
+		return m_instances.count();
+	}
+	;
+
+	/// Clear all instances. Triggers notifications.
+	void clear();
+
+	/// Add an instance. Triggers notifications, returns the new index
+	int add(InstancePtr t);
+
+	/// Get an instance by ID
+	InstancePtr getInstanceById(QString id) const;
+
+	QModelIndex getInstanceIndexById(const QString &id) const;
+
+	// FIXME: instead of iterating through all instances and forming a set, keep the set around
+	QStringList getGroups();
+
+	void deleteGroup(const QString & name);
+
+	/*!
+	 * \brief Creates a stub instance
+	 *
+	 * \param inst Pointer to store the created instance in.
+	 * \param version Game version to use for the instance
+	 * \param instDir The new instance's directory.
+	 * \return An InstCreateError error code.
+	 * - InstExists if the given instance directory is already an instance.
+	 * - CantCreateDir if the given instance directory cannot be created.
+	 */
+	InstCreateError createInstance(InstancePtr &inst, BaseVersionPtr version,
+								   const QString &instDir);
+
+	/*!
+	 * \brief Creates a copy of an existing instance with a new name
+	 *
+	 * \param newInstance Pointer to store the created instance in.
+	 * \param oldInstance The instance to copy
+	 * \param instDir The new instance's directory.
+	 * \return An InstCreateError error code.
+	 * - InstExists if the given instance directory is already an instance.
+	 * - CantCreateDir if the given instance directory cannot be created.
+	 */
+	InstCreateError copyInstance(InstancePtr &newInstance, InstancePtr &oldInstance,
+								 const QString &instDir, bool copySaves);
+
+	/*!
+	 * \brief Loads an instance from the given directory.
+	 * Checks the instance's INI file to figure out what the instance's type is first.
+	 * \param inst Pointer to store the loaded instance in.
+	 * \param instDir The instance's directory.
+	 * \return An InstLoadError error code.
+	 * - NotAnInstance if the given instance directory isn't a valid instance.
+	 */
+	InstLoadError loadInstance(InstancePtr &inst, const QString &instDir);
+
+signals:
+	void dataIsInvalid();
+
+public slots:
+	void on_InstFolderChanged(const Setting &setting, QVariant value);
+
+	/*!
+	 * \brief Loads the instance list. Triggers notifications.
+	 */
+	InstListError loadList();
+
+private slots:
+	void propertiesChanged(BaseInstance *inst);
+	void instanceNuked(BaseInstance *inst);
+	void groupChanged();
+
+private:
+	int getInstIndex(BaseInstance *inst) const;
+
+public:
+	static bool continueProcessInstance(InstancePtr instPtr, const int error, const QDir &dir, QMap<QString, QString> &groupMap);
+
+protected:
+	QString m_instDir;
+	QList<InstancePtr> m_instances;
+	QSet<QString> m_groups;
+	SettingsObjectPtr m_globalSettings;
+	bool suspendedGroupSave = false;
+	bool queuedGroupSave = false;
+};