GH-885 export dialog for filtering exported files

Includes implementation of a separator based prefix tree and some related bits

application/CMakeLists.txt

@@ -207,6 +207,8 @@ SET(MULTIMC_SOURCES
 	dialogs/CustomMessageBox.h
 	dialogs/EditAccountDialog.cpp
 	dialogs/EditAccountDialog.h
+	dialogs/ExportInstanceDialog.cpp
+	dialogs/ExportInstanceDialog.h
 	dialogs/IconPickerDialog.cpp
 	dialogs/IconPickerDialog.h
 	dialogs/LoginDialog.cpp
@@ -290,6 +292,7 @@ SET(MULTIMC_UIS
 	dialogs/IconPickerDialog.ui
 	dialogs/AccountSelectDialog.ui
 	dialogs/EditAccountDialog.ui
+	dialogs/ExportInstanceDialog.ui
 	dialogs/LoginDialog.ui
 	dialogs/UpdateDialog.ui
 	dialogs/NotificationDialog.ui

application/MainWindow.cpp

@@ -349,6 +349,7 @@ namespace Ui {
 #include "dialogs/UpdateDialog.h"
 #include "dialogs/EditAccountDialog.h"
 #include "dialogs/NotificationDialog.h"
+#include "dialogs/ExportInstanceDialog.h"
 
 #include "pages/global/MultiMCPage.h"
 #include "pages/global/ExternalToolsPage.h"
@@ -1475,29 +1476,8 @@ void MainWindow::on_actionExportInstance_triggered()
 {
 	if (m_selectedInstance)
 	{
-		auto name = RemoveInvalidFilenameChars(m_selectedInstance->name());
+		ExportInstanceDialog dlg(m_selectedInstance, this);
-
+		dlg.exec();
-		const QString output = QFileDialog::getSaveFileName(this, tr("Export %1")
-															.arg(m_selectedInstance->name()),
-															PathCombine(QDir::homePath(), name + ".zip") , "Zip (*.zip)");
-		if (output.isNull())
-		{
-			return;
-		}
-		if (QFile::exists(output))
-		{
-			int ret = QMessageBox::question(this, tr("Overwrite?"), tr("This file already exists. Do you want to overwrite it?"),
-											QMessageBox::No, QMessageBox::Yes);
-			if (ret == QMessageBox::No)
-			{
-				return;
-			}
-		}
-
-		if (!MMCZip::compressDir(output, m_selectedInstance->instanceRoot(), name))
-		{
-			QMessageBox::warning(this, tr("Error"), tr("Unable to export instance"));
-		}
 	}
 }
 

application/dialogs/ExportInstanceDialog.cpp

@@ -0,0 +1,434 @@
+/* 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.
+ */
+
+#include "ExportInstanceDialog.h"
+#include "ui_ExportInstanceDialog.h"
+#include <BaseInstance.h>
+#include <MMCZip.h>
+#include <pathutils.h>
+#include <QFileDialog>
+#include <QMessageBox>
+#include <qfilesystemmodel.h>
+
+#include <QSortFilterProxyModel>
+#include <QDebug>
+#include <qstack.h>
+#include <QSaveFile>
+#include "MMCStrings.h"
+#include "SeparatorPrefixTree.h"
+
+class PackIgnoreProxy : public QSortFilterProxyModel
+{
+	Q_OBJECT
+
+public:
+	PackIgnoreProxy(InstancePtr instance, QObject *parent) : QSortFilterProxyModel(parent)
+	{
+		m_instance = instance;
+	}
+	// NOTE: Sadly, we have to do sorting ourselves.
+	bool lessThan(const QModelIndex &left, const QModelIndex &right) const
+	{
+		QFileSystemModel *fsm = qobject_cast<QFileSystemModel *>(sourceModel());
+		if (!fsm)
+		{
+			return QSortFilterProxyModel::lessThan(left, right);
+		}
+		bool asc = sortOrder() == Qt::AscendingOrder ? true : false;
+
+		QFileInfo leftFileInfo = fsm->fileInfo(left);
+		QFileInfo rightFileInfo = fsm->fileInfo(right);
+
+		if (!leftFileInfo.isDir() && rightFileInfo.isDir())
+		{
+			return !asc;
+		}
+		if (leftFileInfo.isDir() && !rightFileInfo.isDir())
+		{
+			return asc;
+		}
+
+		// sort and proxy model breaks the original model...
+		if (sortColumn() == 0)
+		{
+			return Strings::naturalCompare(leftFileInfo.fileName(), rightFileInfo.fileName(),
+										   Qt::CaseInsensitive) < 0;
+		}
+		if (sortColumn() == 1)
+		{
+			auto leftSize = leftFileInfo.size();
+			auto rightSize = rightFileInfo.size();
+			if ((leftSize == rightSize) || (leftFileInfo.isDir() && rightFileInfo.isDir()))
+			{
+				return Strings::naturalCompare(leftFileInfo.fileName(),
+											   rightFileInfo.fileName(),
+											   Qt::CaseInsensitive) < 0
+						   ? asc
+						   : !asc;
+			}
+			return leftSize < rightSize;
+		}
+		return QSortFilterProxyModel::lessThan(left, right);
+	}
+
+	virtual Qt::ItemFlags flags(const QModelIndex &index) const
+	{
+		if (!index.isValid())
+			return Qt::NoItemFlags;
+
+		auto sourceIndex = mapToSource(index);
+		Qt::ItemFlags flags = sourceIndex.flags();
+		if (index.column() == 0)
+		{
+			flags |= Qt::ItemIsUserCheckable;
+			if (sourceIndex.model()->hasChildren(sourceIndex))
+			{
+				flags |= Qt::ItemIsTristate;
+			}
+		}
+
+		return flags;
+	}
+
+	virtual QVariant data(const QModelIndex &index, int role = Qt::DisplayRole) const
+	{
+		QModelIndex sourceIndex = mapToSource(index);
+
+		if (index.column() == 0 && role == Qt::CheckStateRole)
+		{
+			QFileSystemModel *fsm = qobject_cast<QFileSystemModel *>(sourceModel());
+			auto blockedPath = relPath(fsm->filePath(sourceIndex));
+			auto cover = blocked.cover(blockedPath);
+			if (!cover.isNull())
+			{
+				return QVariant(Qt::Unchecked);
+			}
+			else if (blocked.exists(blockedPath))
+			{
+				return QVariant(Qt::PartiallyChecked);
+			}
+			else
+			{
+				return QVariant(Qt::Checked);
+			}
+		}
+
+		return sourceIndex.data(role);
+	}
+
+	virtual bool setData(const QModelIndex &index, const QVariant &value,
+						 int role = Qt::EditRole)
+	{
+		if (index.column() == 0 && role == Qt::CheckStateRole)
+		{
+			Qt::CheckState state = static_cast<Qt::CheckState>(value.toInt());
+			return setFilterState(index, state);
+		}
+
+		QModelIndex sourceIndex = mapToSource(index);
+		return QSortFilterProxyModel::sourceModel()->setData(sourceIndex, value, role);
+	}
+
+	QString relPath(const QString &path) const
+	{
+		QString prefix = QDir().absoluteFilePath(m_instance->instanceRoot());
+		prefix += '/';
+		if (!path.startsWith(prefix))
+		{
+			return QString();
+		}
+		return path.mid(prefix.size());
+	}
+
+	bool setFilterState(QModelIndex index, Qt::CheckState state)
+	{
+		QFileSystemModel *fsm = qobject_cast<QFileSystemModel *>(sourceModel());
+
+		if (!fsm)
+		{
+			return false;
+		}
+
+		QModelIndex sourceIndex = mapToSource(index);
+		auto blockedPath = relPath(fsm->filePath(sourceIndex));
+		bool changed = false;
+		if (state == Qt::Unchecked)
+		{
+			// blocking a path
+			auto &node = blocked.insert(blockedPath);
+			// get rid of all blocked nodes below
+			node.clear();
+			changed = true;
+		}
+		else if (state == Qt::Checked || state == Qt::PartiallyChecked)
+		{
+			if (!blocked.remove(blockedPath))
+			{
+				auto cover = blocked.cover(blockedPath);
+				qDebug() << "Blocked by cover" << cover;
+				// uncover
+				blocked.remove(cover);
+				// block all contents, except for any cover
+				QModelIndex rootIndex =
+					fsm->index(PathCombine(m_instance->instanceRoot(), cover));
+				QModelIndex doing = rootIndex;
+				int row = 0;
+				QStack<QModelIndex> todo;
+				while (1)
+				{
+					auto node = doing.child(row, 0);
+					if (!node.isValid())
+					{
+						if (!todo.size())
+						{
+							break;
+						}
+						else
+						{
+							doing = todo.pop();
+							row = 0;
+							continue;
+						}
+					}
+					auto relpath = relPath(fsm->filePath(node));
+					if (blockedPath.startsWith(relpath)) // cover found?
+					{
+						// continue processing cover later
+						todo.push(node);
+					}
+					else
+					{
+						// or just block this one.
+						blocked.insert(relpath);
+					}
+					row++;
+				}
+			}
+			changed = true;
+		}
+		if (changed)
+		{
+			// update the thing
+			emit dataChanged(index, index, {Qt::CheckStateRole});
+			// update everything above index
+			QModelIndex up = index.parent();
+			while (1)
+			{
+				if (!up.isValid())
+					break;
+				emit dataChanged(up, up, {Qt::CheckStateRole});
+				up = up.parent();
+			}
+			// and everything below the index
+			QModelIndex doing = index;
+			int row = 0;
+			QStack<QModelIndex> todo;
+			while (1)
+			{
+				auto node = doing.child(row, 0);
+				if (!node.isValid())
+				{
+					if (!todo.size())
+					{
+						break;
+					}
+					else
+					{
+						doing = todo.pop();
+						row = 0;
+						continue;
+					}
+				}
+				emit dataChanged(node, node, {Qt::CheckStateRole});
+				todo.push(node);
+				row++;
+			}
+			// siblings and unrelated nodes are ignored
+		}
+		return true;
+	}
+
+	bool shouldExpand(QModelIndex index)
+	{
+		QModelIndex sourceIndex = mapToSource(index);
+		QFileSystemModel *fsm = qobject_cast<QFileSystemModel *>(sourceModel());
+		if (!fsm)
+		{
+			return false;
+		}
+		auto blockedPath = relPath(fsm->filePath(sourceIndex));
+		auto found = blocked.find(blockedPath);
+		if(found)
+		{
+			return !found->leaf();
+		}
+		return false;
+	}
+
+	void setBlockedPaths(QStringList paths)
+	{
+		beginResetModel();
+		blocked.clear();
+		blocked.insert(paths);
+		endResetModel();
+	}
+
+	const SeparatorPrefixTree<'/'> & blockedPaths() const
+	{
+		return blocked;
+	}
+
+protected:
+	bool filterAcceptsColumn(int source_column, const QModelIndex &source_parent) const
+	{
+		Q_UNUSED(source_parent)
+
+		// adjust the columns you want to filter out here
+		// return false for those that will be hidden
+		if (source_column == 2 || source_column == 3)
+			return false;
+
+		return true;
+	}
+
+private:
+	InstancePtr m_instance;
+	SeparatorPrefixTree<'/'> blocked;
+};
+
+ExportInstanceDialog::ExportInstanceDialog(InstancePtr instance, QWidget *parent)
+	: QDialog(parent), ui(new Ui::ExportInstanceDialog), m_instance(instance)
+{
+	ui->setupUi(this);
+	auto model = new QFileSystemModel(this);
+	proxyModel = new PackIgnoreProxy(m_instance, this);
+	loadPackIgnore();
+	proxyModel->setSourceModel(model);
+	auto root = instance->instanceRoot();
+	ui->treeView->setModel(proxyModel);
+	ui->treeView->setRootIndex(proxyModel->mapFromSource(model->index(root)));
+
+	connect(proxyModel, SIGNAL(rowsInserted(QModelIndex,int,int)), SLOT(rowsInserted(QModelIndex,int,int)));
+
+	model->setRootPath(root);
+	auto headerView = ui->treeView->header();
+	headerView->setSectionResizeMode(QHeaderView::ResizeToContents);
+	headerView->setSectionResizeMode(0, QHeaderView::Stretch);
+}
+
+ExportInstanceDialog::~ExportInstanceDialog()
+{
+	delete ui;
+}
+
+bool ExportInstanceDialog::doExport()
+{
+	auto name = RemoveInvalidFilenameChars(m_instance->name());
+
+	const QString output = QFileDialog::getSaveFileName(
+		this, tr("Export %1").arg(m_instance->name()),
+		PathCombine(QDir::homePath(), name + ".zip"), "Zip (*.zip)");
+	if (output.isNull())
+	{
+		return false;
+	}
+	if (QFile::exists(output))
+	{
+		int ret =
+			QMessageBox::question(this, tr("Overwrite?"),
+								  tr("This file already exists. Do you want to overwrite it?"),
+								  QMessageBox::No, QMessageBox::Yes);
+		if (ret == QMessageBox::No)
+		{
+			return false;
+		}
+	}
+
+	if (!MMCZip::compressDir(output, m_instance->instanceRoot(), name, &proxyModel->blockedPaths()))
+	{
+		QMessageBox::warning(this, tr("Error"), tr("Unable to export instance"));
+		return false;
+	}
+	return true;
+}
+
+void ExportInstanceDialog::done(int result)
+{
+	savePackIgnore();
+	if (result == QDialog::Accepted)
+	{
+		if (doExport())
+		{
+			QDialog::done(QDialog::Accepted);
+			return;
+		}
+		else
+		{
+			return;
+		}
+	}
+	QDialog::done(result);
+}
+
+void ExportInstanceDialog::rowsInserted(QModelIndex parent, int top, int bottom)
+{
+	//WARNING: possible off-by-one?
+	for(int i = top; i < bottom; i++)
+	{
+		auto node = parent.child(i, 0);
+		if(proxyModel->shouldExpand(node))
+		{
+			auto expNode = node.parent();
+			if(!expNode.isValid())
+			{
+				continue;
+			}
+			ui->treeView->expand(node);
+		}
+	}
+}
+
+QString ExportInstanceDialog::ignoreFileName()
+{
+	return PathCombine(m_instance->instanceRoot(), ".packignore");
+}
+
+void ExportInstanceDialog::loadPackIgnore()
+{
+	auto filename = ignoreFileName();
+	QFile ignoreFile(filename);
+	if(!ignoreFile.open(QIODevice::ReadOnly))
+	{
+		return;
+	}
+	auto data = ignoreFile.readAll();
+	auto string = QString::fromUtf8(data);
+	proxyModel->setBlockedPaths(string.split('\n', QString::SkipEmptyParts));
+}
+
+void ExportInstanceDialog::savePackIgnore()
+{
+	auto filename = ignoreFileName();
+	QSaveFile ignoreFile(filename);
+	if(!ignoreFile.open(QIODevice::WriteOnly))
+	{
+		ignoreFile.cancelWriting();
+	}
+	auto data = proxyModel->blockedPaths().toStringList().join('\n').toUtf8();
+	ignoreFile.write(data);
+	ignoreFile.commit();
+}
+
+#include "ExportInstanceDialog.moc"

application/dialogs/ExportInstanceDialog.h

@@ -0,0 +1,54 @@
+/* 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 <QDialog>
+#include <QModelIndex>
+#include <memory>
+
+class BaseInstance;
+class PackIgnoreProxy;
+typedef std::shared_ptr<BaseInstance> InstancePtr;
+
+namespace Ui
+{
+class ExportInstanceDialog;
+}
+
+class ExportInstanceDialog : public QDialog
+{
+	Q_OBJECT
+
+public:
+	explicit ExportInstanceDialog(InstancePtr instance, QWidget *parent = 0);
+	~ExportInstanceDialog();
+
+	virtual void done(int result);
+
+private:
+	bool doExport();
+	void loadPackIgnore();
+	void savePackIgnore();
+	QString ignoreFileName();
+
+private:
+	Ui::ExportInstanceDialog *ui;
+	InstancePtr m_instance;
+	PackIgnoreProxy * proxyModel;
+
+private slots:
+	void rowsInserted(QModelIndex parent, int top, int bottom);
+};

application/dialogs/ExportInstanceDialog.ui

@@ -0,0 +1,83 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<ui version="4.0">
+ <class>ExportInstanceDialog</class>
+ <widget class="QDialog" name="ExportInstanceDialog">
+  <property name="geometry">
+   <rect>
+    <x>0</x>
+    <y>0</y>
+    <width>720</width>
+    <height>625</height>
+   </rect>
+  </property>
+  <property name="windowTitle">
+   <string>Export Instance</string>
+  </property>
+  <layout class="QVBoxLayout" name="verticalLayout">
+   <item>
+    <widget class="QTreeView" name="treeView">
+     <property name="alternatingRowColors">
+      <bool>true</bool>
+     </property>
+     <property name="selectionMode">
+      <enum>QAbstractItemView::ExtendedSelection</enum>
+     </property>
+     <property name="sortingEnabled">
+      <bool>true</bool>
+     </property>
+     <attribute name="headerStretchLastSection">
+      <bool>false</bool>
+     </attribute>
+    </widget>
+   </item>
+   <item>
+    <widget class="QDialogButtonBox" name="buttonBox">
+     <property name="orientation">
+      <enum>Qt::Horizontal</enum>
+     </property>
+     <property name="standardButtons">
+      <set>QDialogButtonBox::Cancel|QDialogButtonBox::Ok</set>
+     </property>
+    </widget>
+   </item>
+  </layout>
+ </widget>
+ <tabstops>
+  <tabstop>treeView</tabstop>
+ </tabstops>
+ <resources/>
+ <connections>
+  <connection>
+   <sender>buttonBox</sender>
+   <signal>accepted()</signal>
+   <receiver>ExportInstanceDialog</receiver>
+   <slot>accept()</slot>
+   <hints>
+    <hint type="sourcelabel">
+     <x>248</x>
+     <y>254</y>
+    </hint>
+    <hint type="destinationlabel">
+     <x>157</x>
+     <y>274</y>
+    </hint>
+   </hints>
+  </connection>
+  <connection>
+   <sender>buttonBox</sender>
+   <signal>rejected()</signal>
+   <receiver>ExportInstanceDialog</receiver>
+   <slot>reject()</slot>
+   <hints>
+    <hint type="sourcelabel">
+     <x>316</x>
+     <y>260</y>
+    </hint>
+    <hint type="destinationlabel">
+     <x>286</x>
+     <y>274</y>
+    </hint>
+   </hints>
+  </connection>
+ </connections>
+</ui>

logic/CMakeLists.txt

@@ -17,6 +17,11 @@ SET(LOGIC_SOURCES
 	MMCError.h
 	MMCZip.h
 	MMCZip.cpp
+	MMCStrings.h
+	MMCStrings.cpp
+
+	# Prefix tree where node names are strings between separators
+	SeparatorPrefixTree.h
 
 	# WARNING: globals live here
 	Env.h

logic/MMCStrings.cpp

@@ -0,0 +1,76 @@
+#include "MMCStrings.h"
+
+/// TAKEN FROM Qt, because it doesn't expose it intelligently
+static inline QChar getNextChar(const QString &s, int location)
+{
+	return (location < s.length()) ? s.at(location) : QChar();
+}
+
+/// TAKEN FROM Qt, because it doesn't expose it intelligently
+int Strings::naturalCompare(const QString &s1, const QString &s2, Qt::CaseSensitivity cs)
+{
+	for (int l1 = 0, l2 = 0; l1 <= s1.count() && l2 <= s2.count(); ++l1, ++l2)
+	{
+		// skip spaces, tabs and 0's
+		QChar c1 = getNextChar(s1, l1);
+		while (c1.isSpace())
+			c1 = getNextChar(s1, ++l1);
+		QChar c2 = getNextChar(s2, l2);
+		while (c2.isSpace())
+			c2 = getNextChar(s2, ++l2);
+
+		if (c1.isDigit() && c2.isDigit())
+		{
+			while (c1.digitValue() == 0)
+				c1 = getNextChar(s1, ++l1);
+			while (c2.digitValue() == 0)
+				c2 = getNextChar(s2, ++l2);
+
+			int lookAheadLocation1 = l1;
+			int lookAheadLocation2 = l2;
+			int currentReturnValue = 0;
+			// find the last digit, setting currentReturnValue as we go if it isn't equal
+			for (QChar lookAhead1 = c1, lookAhead2 = c2;
+				 (lookAheadLocation1 <= s1.length() && lookAheadLocation2 <= s2.length());
+				 lookAhead1 = getNextChar(s1, ++lookAheadLocation1),
+					   lookAhead2 = getNextChar(s2, ++lookAheadLocation2))
+			{
+				bool is1ADigit = !lookAhead1.isNull() && lookAhead1.isDigit();
+				bool is2ADigit = !lookAhead2.isNull() && lookAhead2.isDigit();
+				if (!is1ADigit && !is2ADigit)
+					break;
+				if (!is1ADigit)
+					return -1;
+				if (!is2ADigit)
+					return 1;
+				if (currentReturnValue == 0)
+				{
+					if (lookAhead1 < lookAhead2)
+					{
+						currentReturnValue = -1;
+					}
+					else if (lookAhead1 > lookAhead2)
+					{
+						currentReturnValue = 1;
+					}
+				}
+			}
+			if (currentReturnValue != 0)
+				return currentReturnValue;
+		}
+		if (cs == Qt::CaseInsensitive)
+		{
+			if (!c1.isLower())
+				c1 = c1.toLower();
+			if (!c2.isLower())
+				c2 = c2.toLower();
+		}
+		int r = QString::localeAwareCompare(c1, c2);
+		if (r < 0)
+			return -1;
+		if (r > 0)
+			return 1;
+	}
+	// The two strings are the same (02 == 2) so fall back to the normal sort
+	return QString::compare(s1, s2, cs);
+}

logic/MMCStrings.h

@@ -0,0 +1,8 @@
+#pragma once
+
+#include <QString>
+
+namespace Strings
+{
+	int naturalCompare(const QString &s1, const QString &s2, Qt::CaseSensitivity cs);
+}

logic/MMCZip.cpp

@@ -89,7 +89,7 @@ bool compressFile(QuaZip *zip, QString fileName, QString fileDest)
 	return true;
 }
 
-bool MMCZip::compressSubDir(QuaZip* zip, QString dir, QString origDir, QSet<QString>& added,  QString prefix)
+bool MMCZip::compressSubDir(QuaZip* zip, QString dir, QString origDir, QSet<QString>& added,  QString prefix, const SeparatorPrefixTree <'/'> * blacklist)
 {
 	if (!zip) return false;
 	if (zip->getMode()!=QuaZip::mdCreate && zip->getMode()!=QuaZip::mdAppend && zip->getMode()!=QuaZip::mdAdd)
@@ -105,6 +105,9 @@ bool MMCZip::compressSubDir(QuaZip* zip, QString dir, QString origDir, QSet<QStr
 
 	QDir origDirectory(origDir);
 	if (dir != origDir)
+	{
+		QString internalDirName = origDirectory.relativeFilePath(dir);
+		if(!blacklist || !blacklist->covers(internalDirName))
 		{
 			QuaZipFile dirZipFile(zip);
 			auto dirPrefix = PathCombine(prefix, origDirectory.relativeFilePath(dir)) + "/";
@@ -114,6 +117,7 @@ bool MMCZip::compressSubDir(QuaZip* zip, QString dir, QString origDir, QSet<QStr
 			}
 			dirZipFile.close();
 		}
+	}
 
 	QFileInfoList files = directory.entryInfoList(QDir::AllDirs | QDir::NoDotAndDotDot | QDir::Hidden);
 	for (auto file: files)
@@ -122,7 +126,7 @@ bool MMCZip::compressSubDir(QuaZip* zip, QString dir, QString origDir, QSet<QStr
 		{
 			continue;
 		}
-		if(!compressSubDir(zip,file.absoluteFilePath(),origDir, added, prefix))
+		if(!compressSubDir(zip,file.absoluteFilePath(),origDir, added, prefix, blacklist))
 		{
 			return false;
 		}
@@ -142,6 +146,10 @@ bool MMCZip::compressSubDir(QuaZip* zip, QString dir, QString origDir, QSet<QStr
 		}
 
 		QString filename = origDirectory.relativeFilePath(file.absoluteFilePath());
+		if(blacklist && blacklist->covers(filename))
+		{
+			continue;
+		}
 		if(prefix.size())
 		{
 			filename = PathCombine(prefix, filename);
@@ -305,7 +313,7 @@ bool MMCZip::metaInfFilter(QString key)
 	return true;
 }
 
-bool MMCZip::compressDir(QString zipFile, QString dir, QString prefix)
+bool MMCZip::compressDir(QString zipFile, QString dir, QString prefix, const SeparatorPrefixTree <'/'> * blacklist)
 {
 	QuaZip zip(zipFile);
 	QDir().mkpath(QFileInfo(zipFile).absolutePath());
@@ -316,7 +324,7 @@ bool MMCZip::compressDir(QString zipFile, QString dir, QString prefix)
 	}
 
 	QSet<QString> added;
-	if (!compressSubDir(&zip, dir, dir, added, prefix))
+	if (!compressSubDir(&zip, dir, dir, added, prefix, blacklist))
 	{
 		QFile::remove(zipFile);
 		return false;

logic/MMCZip.h

@@ -4,6 +4,7 @@
 #include <QFileInfo>
 #include <QSet>
 #include "minecraft/Mod.h"
+#include "SeparatorPrefixTree.h"
 #include <functional>
 
 class QuaZip;
@@ -18,7 +19,8 @@ namespace MMCZip
 	 * \param recursive Whether to pack sub-directories as well or only files.
 	 * \return true if success, false otherwise.
      */
-	bool compressSubDir(QuaZip* zip, QString dir, QString origDir, QSet<QString>& added, QString prefix = QString());
+	bool compressSubDir(QuaZip *zip, QString dir, QString origDir, QSet<QString> &added,
+					QString prefix = QString(), const SeparatorPrefixTree <'/'> * blacklist = nullptr);
 
 	/**
 	 * Compress a whole directory.
@@ -27,7 +29,7 @@ namespace MMCZip
 	 * \param recursive Whether to pack the subdirectories as well, or just regular files.
 	 * \return true if success, false otherwise.
 	 */
-	bool compressDir(QString zipFile, QString dir, QString prefix = QString());
+	bool compressDir(QString zipFile, QString dir, QString prefix = QString(), const SeparatorPrefixTree <'/'> * blacklist = nullptr);
 
 	/// filter function for @mergeZipFiles - passthrough
 	bool noFilter(QString key);

logic/SeparatorPrefixTree.h

@@ -0,0 +1,298 @@
+#pragma once
+#include <QString>
+#include <QMap>
+#include <QStringList>
+
+template <char Tseparator>
+class SeparatorPrefixTree
+{
+public:
+	SeparatorPrefixTree(QStringList paths)
+	{
+		insert(paths);
+	}
+
+	SeparatorPrefixTree(bool contained = false)
+	{
+		m_contained = contained;
+	}
+
+	void insert(QStringList paths)
+	{
+		for(auto &path: paths)
+		{
+			insert(path);
+		}
+	}
+
+	/// insert an exact path into the tree
+	SeparatorPrefixTree & insert(QString path)
+	{
+		auto sepIndex = path.indexOf(Tseparator);
+		if(sepIndex == -1)
+		{
+			children[path] = SeparatorPrefixTree(true);
+			return children[path];
+		}
+		else
+		{
+			auto prefix = path.left(sepIndex);
+			if(!children.contains(prefix))
+			{
+				children[prefix] = SeparatorPrefixTree(false);
+			}
+			return children[prefix].insert(path.mid(sepIndex + 1));
+		}
+	}
+
+	/// is the path fully contained in the tree?
+	bool contains(QString path) const
+	{
+		auto node = find(path);
+		return node != nullptr;
+	}
+
+	/// does the tree cover a path? That means the prefix of the path is contained in the tree
+	bool covers(QString path) const
+	{
+		// if we found some valid node, it's good enough. the tree covers the path
+		if(m_contained)
+		{
+			return true;
+		}
+		auto sepIndex = path.indexOf(Tseparator);
+		if(sepIndex == -1)
+		{
+			auto found = children.find(path);
+			if(found == children.end())
+			{
+				return false;
+			}
+			return (*found).covers(QString());
+		}
+		else
+		{
+			auto prefix = path.left(sepIndex);
+			auto found = children.find(prefix);
+			if(found == children.end())
+			{
+				return false;
+			}
+			return (*found).covers(path.mid(sepIndex + 1));
+		}
+	}
+
+	/// return the contained path that covers the path specified
+	QString cover(QString path) const
+	{
+		// if we found some valid node, it's good enough. the tree covers the path
+		if(m_contained)
+		{
+			return QString("");
+		}
+		auto sepIndex = path.indexOf(Tseparator);
+		if(sepIndex == -1)
+		{
+			auto found = children.find(path);
+			if(found == children.end())
+			{
+				return QString();
+			}
+			auto nested = (*found).cover(QString());
+			if(nested.isNull())
+			{
+				return nested;
+			}
+			if(nested.isEmpty())
+				return path;
+			return path + Tseparator + nested;
+		}
+		else
+		{
+			auto prefix = path.left(sepIndex);
+			auto found = children.find(prefix);
+			if(found == children.end())
+			{
+				return QString();
+			}
+			auto nested = (*found).cover(path.mid(sepIndex + 1));
+			if(nested.isNull())
+			{
+				return nested;
+			}
+			if(nested.isEmpty())
+				return prefix;
+			return prefix + Tseparator + nested;
+		}
+	}
+
+	/// Does the path-specified node exist in the tree? It does not have to be contained.
+	bool exists(QString path) const
+	{
+		auto sepIndex = path.indexOf(Tseparator);
+		if(sepIndex == -1)
+		{
+			auto found = children.find(path);
+			if(found == children.end())
+			{
+				return false;
+			}
+			return true;
+		}
+		else
+		{
+			auto prefix = path.left(sepIndex);
+			auto found = children.find(prefix);
+			if(found == children.end())
+			{
+				return false;
+			}
+			return (*found).exists(path.mid(sepIndex + 1));
+		}
+	}
+
+	/// find a node in the tree by name
+	const SeparatorPrefixTree * find(QString path) const
+	{
+		auto sepIndex = path.indexOf(Tseparator);
+		if(sepIndex == -1)
+		{
+			auto found = children.find(path);
+			if(found == children.end())
+			{
+				return nullptr;
+			}
+			return &(*found);
+		}
+		else
+		{
+			auto prefix = path.left(sepIndex);
+			auto found = children.find(prefix);
+			if(found == children.end())
+			{
+				return nullptr;
+			}
+			return (*found).find(path.mid(sepIndex + 1));
+		}
+	}
+
+	/// is this a leaf node?
+	bool leaf() const
+	{
+		return children.isEmpty();
+	}
+
+	/// is this node actually contained in the tree, or is it purely structural?
+	bool contained() const
+	{
+		return m_contained;
+	}
+
+	/// Remove a path from the tree
+	bool remove(QString path)
+	{
+		return removeInternal(path) != Failed;
+	}
+
+	/// Clear all children of this node tree node
+	void clear()
+	{
+		children.clear();
+	}
+
+	QStringList toStringList() const
+	{
+		QStringList collected;
+		// collecting these is more expensive.
+		auto iter = children.begin();
+		while(iter != children.end())
+		{
+			QStringList list = iter.value().toStringList();
+			for(int i = 0; i < list.size(); i++)
+			{
+				list[i] = iter.key() + Tseparator + list[i];
+			}
+			collected.append(list);
+			if((*iter).m_contained)
+			{
+				collected.append(iter.key());
+			}
+			iter++;
+		}
+		return collected;
+	}
+private:
+	enum Removal
+	{
+		Failed,
+		Succeeded,
+		HasChildren
+	};
+	Removal removeInternal(QString path = QString())
+	{
+		if(path.isEmpty())
+		{
+			if(!m_contained)
+			{
+				// remove all children - we are removing a prefix
+				clear();
+				return Succeeded;
+			}
+			m_contained = false;
+			if(children.size())
+			{
+				return HasChildren;
+			}
+			return Succeeded;
+		}
+		Removal remStatus = Failed;
+		QString childToRemove;
+		auto sepIndex = path.indexOf(Tseparator);
+		if(sepIndex == -1)
+		{
+			childToRemove = path;
+			auto found = children.find(childToRemove);
+			if(found == children.end())
+			{
+				return Failed;
+			}
+			remStatus = (*found).removeInternal();
+		}
+		else
+		{
+			childToRemove = path.left(sepIndex);
+			auto found = children.find(childToRemove);
+			if(found == children.end())
+			{
+				return Failed;
+			}
+			remStatus = (*found).removeInternal(path.mid(sepIndex + 1));
+		}
+		switch (remStatus)
+		{
+			case Failed:
+			case HasChildren:
+			{
+				return remStatus;
+			}
+			case Succeeded:
+			{
+				children.remove(childToRemove);
+				if(m_contained)
+				{
+					return HasChildren;
+				}
+				if(children.size())
+				{
+					return HasChildren;
+				}
+				return Succeeded;
+			}
+		}
+		return Failed;
+	}
+
+private:
+	QMap<QString,SeparatorPrefixTree<Tseparator>> children;
+	bool m_contained = false;
+};