1 files changed, 1092 insertions, 0 deletions
diff --git a/src/filetreemodel.cpp b/src/filetreemodel.cpp
new file mode 100644
index 00000000..2130bf89
--- /dev/null
+++ b/src/filetreemodel.cpp
@@ -0,0 +1,1092 @@
+#include "filetreemodel.h"
+#include "organizercore.h"
+#include <log.h>
+
+using namespace MOBase;
+using namespace MOShared;
+
+// in mainwindow.cpp
+QString UnmanagedModName();
+
+
+#define trace(f)
+
+
+// tracks a contiguous range in the model to avoid calling begin*Rows(), etc.
+// for every single item that's added/removed
+//
+class FileTreeModel::Range
+{
+public:
+  // note that file ranges can start from an index higher than 0 if there are
+  // directories
+  //
+  Range(FileTreeModel* model, FileTreeItem& parentItem, int start=0)
+    : m_model(model), m_parentItem(parentItem), m_first(-1), m_current(start)
+  {
+  }
+
+  // includes the current index in the range
+  //
+  void includeCurrent()
+  {
+    // just remember the start of the range, m_current will be used in add()
+    // or remove() to figure out the actual range
+    if (m_first == -1) {
+      m_first = m_current;
+    }
+  }
+
+  // moves to the next row
+  //
+  void next()
+  {
+    ++m_current;
+  }
+
+  // returns the current row
+  //
+  int current() const
+  {
+    return m_current;
+  }
+
+  // adds the given items to this range
+  //
+  void add(FileTreeItem::Children toAdd)
+  {
+    if (m_first == -1) {
+      // nothing to add
+      Q_ASSERT(toAdd.empty());
+      return;
+    }
+
+    const auto last = m_current - 1;
+    const auto parentIndex = m_model->indexFromItem(m_parentItem);
+
+    // make sure the number of items is the same as the size of this range
+    Q_ASSERT(static_cast<int>(toAdd.size()) == (last - m_first + 1));
+
+    trace(log::debug("Range::add() {} to {}", m_first, last));
+
+    m_model->beginInsertRows(parentIndex, m_first, last);
+
+    m_parentItem.insert(
+      std::make_move_iterator(toAdd.begin()),
+      std::make_move_iterator(toAdd.end()),
+      static_cast<std::size_t>(m_first));
+
+    m_model->endInsertRows();
+
+    // reset
+    m_first = -1;
+  }
+
+  // removes the item in this range, returns an iterator to first item passed
+  // this range once removed, which can be end()
+  //
+  FileTreeItem::Children::const_iterator remove()
+  {
+    if (m_first >= 0) {
+      const auto last = m_current - 1;
+      const auto parentIndex = m_model->indexFromItem(m_parentItem);
+
+      trace(log::debug("Range::remove() {} to {}", m_first, last));
+
+      m_model->beginRemoveRows(parentIndex, m_first, last);
+
+      m_parentItem.remove(
+        static_cast<std::size_t>(m_first),
+        static_cast<std::size_t>(last - m_first + 1));
+
+      m_model->endRemoveRows();
+
+      m_model->removePendingIcons(parentIndex, m_first, last);
+
+      // adjust current row to account for those that were just removed
+      m_current -= (m_current - m_first);
+
+      // reset
+      m_first = -1;
+    }
+
+    if (m_current >= m_parentItem.children().size()) {
+      return m_parentItem.children().end();
+    }
+
+    return m_parentItem.children().begin() + m_current + 1;
+  }
+
+private:
+  FileTreeModel* m_model;
+  FileTreeItem& m_parentItem;
+  int m_first;
+  int m_current;
+};
+
+
+FileTreeItem* getItem(const QModelIndex& index)
+{
+  return static_cast<FileTreeItem*>(index.internalPointer());
+}
+
+void* makeInternalPointer(FileTreeItem* item)
+{
+  return item;
+}
+
+
+FileTreeModel::FileTreeModel(OrganizerCore& core, QObject* parent) :
+  QAbstractItemModel(parent), m_core(core), m_enabled(true),
+  m_root(FileTreeItem::createDirectory(this, nullptr, L"", L"")),
+  m_flags(NoFlags), m_fullyLoaded(false)
+{
+  m_root->setExpanded(true);
+
+  connect(&m_iconPendingTimer, &QTimer::timeout, [&]{ updatePendingIcons(); });
+}
+
+void FileTreeModel::refresh()
+{
+  TimeThis tt("FileTreeModel::refresh()");
+
+  m_fullyLoaded = false;
+  update(*m_root, *m_core.directoryStructure(), L"");
+}
+
+void FileTreeModel::clear()
+{
+  m_fullyLoaded = false;
+
+  beginResetModel();
+  m_root->clear();
+  endResetModel();
+}
+
+void FileTreeModel::recursiveFetchMore(const QModelIndex& m)
+{
+  if (canFetchMore(m)) {
+    fetchMore(m);
+  }
+
+  for (int i=0; i<rowCount(m); ++i) {
+    recursiveFetchMore(index(i, 0, m));
+  }
+}
+
+void FileTreeModel::ensureFullyLoaded()
+{
+  if (!m_fullyLoaded) {
+    TimeThis tt("FileTreeModel:: fully loading for search");
+    recursiveFetchMore(QModelIndex());
+    m_fullyLoaded = true;
+  }
+}
+
+bool FileTreeModel::enabled() const
+{
+  return m_enabled;
+}
+
+void FileTreeModel::setEnabled(bool b)
+{
+  m_enabled = b;
+}
+
+const FileTreeModel::SortInfo& FileTreeModel::sortInfo() const
+{
+  return m_sort;
+}
+
+bool FileTreeModel::showArchives() const
+{
+  return (m_flags.testFlag(Archives) && m_core.getArchiveParsing());
+}
+
+QModelIndex FileTreeModel::index(
+  int row, int col, const QModelIndex& parentIndex) const
+{
+  if (auto* parentItem=itemFromIndex(parentIndex)) {
+    if (row < 0 || row >= parentItem->children().size()) {
+      log::error("row {} out of range for {}", row, parentItem->debugName());
+      return {};
+    }
+
+    return createIndex(row, col, makeInternalPointer(parentItem));
+  }
+
+  log::error("FileTreeModel::index(): parentIndex has no internal pointer");
+  return {};
+}
+
+QModelIndex FileTreeModel::parent(const QModelIndex& index) const
+{
+  if (!index.isValid()) {
+    return {};
+  }
+
+  auto* parentItem = getItem(index);
+  if (!parentItem) {
+    log::error("FileTreeModel::parent(): no internal pointer");
+    return {};
+  }
+
+  return indexFromItem(*parentItem);
+}
+
+int FileTreeModel::rowCount(const QModelIndex& parent) const
+{
+  if (auto* item=itemFromIndex(parent)) {
+    return static_cast<int>(item->children().size());
+  }
+
+  return 0;
+}
+
+int FileTreeModel::columnCount(const QModelIndex&) const
+{
+  return ColumnCount;
+}
+
+bool FileTreeModel::hasChildren(const QModelIndex& parent) const
+{
+  if (auto* item=itemFromIndex(parent)) {
+    return item->hasChildren();
+  }
+
+  return false;
+}
+
+bool FileTreeModel::canFetchMore(const QModelIndex& parent) const
+{
+  if (!m_enabled) {
+    return false;
+  }
+
+  if (auto* item=itemFromIndex(parent)) {
+    return !item->isLoaded();
+  }
+
+  return false;
+}
+
+void FileTreeModel::fetchMore(const QModelIndex& parent)
+{
+  FileTreeItem* item = itemFromIndex(parent);
+  if (!item) {
+    return;
+  }
+
+  const auto path = item->dataRelativeFilePath();
+
+  auto* parentEntry = m_core.directoryStructure()
+    ->findSubDirectoryRecursive(path.toStdWString());
+
+  if (!parentEntry) {
+    log::error("FileTreeModel::fetchMore(): directory '{}' not found", path);
+    return;
+  }
+
+  const auto parentPath = item->dataRelativeParentPath();
+
+  update(*item, *parentEntry, parentPath.toStdWString());
+}
+
+QVariant FileTreeModel::data(const QModelIndex& index, int role) const
+{
+  switch (role)
+  {
+    case Qt::DisplayRole:
+    {
+      if (auto* item=itemFromIndex(index)) {
+        return displayData(item, index.column());
+      }
+
+      break;
+    }
+
+    case Qt::FontRole:
+    {
+      if (auto* item=itemFromIndex(index)) {
+        return item->font();
+      }
+
+      break;
+    }
+
+    case Qt::ToolTipRole:
+    {
+      if (auto* item=itemFromIndex(index)) {
+        return makeTooltip(*item);
+      }
+
+      return {};
+    }
+
+    case Qt::ForegroundRole:
+    {
+      if (index.column() == 1) {
+        if (auto* item=itemFromIndex(index)) {
+          if (item->isConflicted()) {
+            return QBrush(Qt::red);
+          }
+        }
+      }
+
+      break;
+    }
+
+    case Qt::DecorationRole:
+    {
+      if (index.column() == 0) {
+        if (auto* item=itemFromIndex(index)) {
+          return makeIcon(*item, index);
+        }
+      }
+
+      break;
+    }
+  }
+
+  return {};
+}
+
+QVariant FileTreeModel::headerData(int i, Qt::Orientation ori, int role) const
+{
+  static const std::array<QString, ColumnCount> names = {
+    tr("Name"), tr("Mod"), tr("Type"), tr("Size"), tr("Date modified")
+  };
+
+  if (role == Qt::DisplayRole) {
+    if (i >= 0 && i < static_cast<int>(names.size())) {
+      return names[static_cast<std::size_t>(i)];
+    }
+  }
+
+  return {};
+}
+
+Qt::ItemFlags FileTreeModel::flags(const QModelIndex& index) const
+{
+  auto f = QAbstractItemModel::flags(index);
+
+  if (auto* item=itemFromIndex(index)) {
+    if (!item->hasChildren()) {
+      f |= Qt::ItemNeverHasChildren;
+    }
+  }
+
+  return f;
+}
+
+void FileTreeModel::sortItem(FileTreeItem& item, bool force)
+{
+  emit layoutAboutToBeChanged();
+
+  const auto oldList = persistentIndexList();
+  std::vector<std::pair<FileTreeItem*, int>> oldItems;
+
+  const auto itemCount = oldList.size();
+  oldItems.reserve(static_cast<std::size_t>(itemCount));
+
+  for (int i=0; i<itemCount; ++i) {
+    const QModelIndex& index = oldList[i];
+    oldItems.push_back({itemFromIndex(index), index.column()});
+  }
+
+  item.sort(m_sort.column, m_sort.order, force);
+
+  QModelIndexList newList;
+  newList.reserve(itemCount);
+
+  for (int i=0; i<itemCount; ++i) {
+    const auto& pair = oldItems[static_cast<std::size_t>(i)];
+    newList.append(indexFromItem(*pair.first, pair.second));
+  }
+
+  changePersistentIndexList(oldList, newList);
+
+  emit layoutChanged({}, QAbstractItemModel::VerticalSortHint);
+}
+
+void FileTreeModel::sort(int column, Qt::SortOrder order)
+{
+  m_sort.column = column;
+  m_sort.order = order;
+
+  sortItem(*m_root, false);
+}
+
+FileTreeItem* FileTreeModel::itemFromIndex(const QModelIndex& index) const
+{
+  if (!index.isValid()) {
+    return m_root.get();
+  }
+
+  auto* parentItem = getItem(index);
+  if (!parentItem) {
+    log::error("FileTreeModel::itemFromIndex(): no internal pointer");
+    return nullptr;
+  }
+
+  if (index.row() < 0 || index.row() >= parentItem->children().size()) {
+    log::error(
+      "FileeTreeModel::itemFromIndex(): row {} is out of range for {}",
+      index.row(), parentItem->debugName());
+
+    return nullptr;
+  }
+
+  return parentItem->children()[index.row()].get();
+}
+
+QModelIndex FileTreeModel::indexFromItem(FileTreeItem& item, int col) const
+{
+  auto* parent = item.parent();
+  if (!parent) {
+    return {};
+  }
+
+  const int index = parent->childIndex(item);
+  if (index == -1) {
+    log::error(
+      "FileTreeMode::indexFromItem(): item {} not found in parent",
+      item.debugName());
+
+    return {};
+  }
+
+  return createIndex(index, col, makeInternalPointer(parent));
+}
+
+void FileTreeModel::update(
+  FileTreeItem& parentItem, const MOShared::DirectoryEntry& parentEntry,
+  const std::wstring& parentPath)
+{
+  trace(log::debug("updating {}", parentItem.debugName()));
+
+  auto path = parentPath;
+  if (!parentEntry.isTopLevel()) {
+    if (!path.empty()) {
+      path += L"\\";
+    }
+
+    path += parentEntry.getName();
+  }
+
+  parentItem.setLoaded(true);
+
+  bool added = false;
+
+  if (updateDirectories(parentItem, path, parentEntry)) {
+    added = true;
+  }
+
+  if (updateFiles(parentItem, path, parentEntry)) {
+    added = true;
+  }
+
+  if (added) {
+    parentItem.sort(m_sort.column, m_sort.order, true);
+  }
+}
+
+bool FileTreeModel::updateDirectories(
+  FileTreeItem& parentItem, const std::wstring& parentPath,
+  const MOShared::DirectoryEntry& parentEntry)
+{
+  // removeDisappearingDirectories() will add directories that are in the
+  // tree and still on the filesystem to this set; addNewDirectories() will
+  // use this to figure out if a directory is new or not
+  std::unordered_set<std::wstring_view> seen;
+
+  removeDisappearingDirectories(parentItem, parentEntry, parentPath, seen);
+  return addNewDirectories(parentItem, parentEntry, parentPath, seen);
+}
+
+void FileTreeModel::removeDisappearingDirectories(
+  FileTreeItem& parentItem, const MOShared::DirectoryEntry& parentEntry,
+  const std::wstring& parentPath, std::unordered_set<std::wstring_view>& seen)
+{
+  auto& children = parentItem.children();
+  auto itor = children.begin();
+
+  // keeps track of the contiguous directories that need to be removed to
+  // avoid calling beginRemoveRows(), etc. for each item
+  Range range(this, parentItem);
+
+  // for each item in this tree item
+  while (itor != children.end()) {
+    const auto& item = *itor;
+
+    if (!item->isDirectory()) {
+      // directories are always first, no point continuing once a file has
+      // been seen
+      break;
+    }
+
+    auto d = parentEntry.findSubDirectory(item->filenameWsLowerCase(), true);
+
+    if (d) {
+      trace(log::debug("dir {} still there", item->filename()));
+
+      // directory is still there
+      seen.emplace(d->getName());
+
+      bool currentRemoved = false;
+
+      if (item->areChildrenVisible()) {
+        // the item is currently expanded, update it
+        update(*item, *d, parentPath);
+      }
+
+      if (shouldShowFolder(*d, item.get())) {
+        // folder should be left in the list
+        if (!item->areChildrenVisible() && item->isLoaded()) {
+          if (!d->isEmpty()) {
+            // the item is loaded (previously expanded but now collapsed) and
+            // has children, mark  it as unloaded so it updates when next
+            // expanded
+            item->setLoaded(false);
+          }
+        }
+      } else {
+        // item wouldn't have any children, prune it
+        trace(log::debug("dir {} is empty and pruned", item->filename()));
+
+        range.includeCurrent();
+        currentRemoved = true;
+        ++itor;
+      }
+
+      if (!currentRemoved) {
+        // if there were directories before this row that need to be removed,
+        // do it now
+        itor = range.remove();
+      }
+    } else {
+      // directory is gone from the parent entry
+      trace(log::debug("dir {} is gone", item->filename()));
+
+      range.includeCurrent();
+      ++itor;
+    }
+
+    range.next();
+  }
+
+  // remove the last directory range, if any
+  range.remove();
+}
+
+bool FileTreeModel::addNewDirectories(
+  FileTreeItem& parentItem, const MOShared::DirectoryEntry& parentEntry,
+  const std::wstring& parentPath,
+  const std::unordered_set<std::wstring_view>& seen)
+{
+  // keeps track of the contiguous directories that need to be added to
+  // avoid calling beginAddRows(), etc. for each item
+  Range range(this, parentItem);
+  std::vector<FileTreeItem::Ptr> toAdd;
+  bool added = false;
+
+  // for each directory on the filesystem
+  for (auto&& d : parentEntry.getSubDirectories()) {
+    if (seen.contains(d->getName())) {
+      // already seen in the parent item
+
+      // if there were directories before this row that need to be added,
+      // do it now
+      //
+      // todo: if the directory was actually removed in
+      // removeDisappearingDirectories(), the range doesn't need to be added
+      // now and could be extended further
+      range.add(std::move(toAdd));
+      toAdd.clear();
+    } else {
+      if (!shouldShowFolder(*d, nullptr)) {
+        // this is a new directory, but it doesn't contain anything interesting
+        trace(log::debug("new dir {}, empty and pruned", QString::fromStdWString(d->getName())));
+
+        // act as if this directory doesn't exist at all
+        continue;
+      }
+
+      // this is a new directory
+      trace(log::debug("new dir {}", QString::fromStdWString(d->getName())));
+
+      toAdd.push_back(createDirectoryItem(parentItem, parentPath, *d));
+      added = true;
+
+      range.includeCurrent();
+    }
+
+    range.next();
+  }
+
+  // add the last directory range, if any
+  range.add(std::move(toAdd));
+
+  return added;
+}
+
+bool FileTreeModel::updateFiles(
+  FileTreeItem& parentItem, const std::wstring& parentPath,
+  const MOShared::DirectoryEntry& parentEntry)
+{
+  // removeDisappearingFiles() will add files that are in the tree and still on
+  // the filesystem to this set; addNewFiless() will use this to figure out if
+  // a file is new or not
+  std::unordered_set<FileEntry::Index> seen;
+
+  int firstFileRow = 0;
+
+  removeDisappearingFiles(parentItem, parentEntry, firstFileRow, seen);
+  return addNewFiles(parentItem, parentEntry, parentPath, firstFileRow, seen);
+}
+
+void FileTreeModel::removeDisappearingFiles(
+  FileTreeItem& parentItem, const MOShared::DirectoryEntry& parentEntry,
+  int& firstFileRow, std::unordered_set<FileEntry::Index>& seen)
+{
+  auto& children = parentItem.children();
+  auto itor = children.begin();
+
+  firstFileRow = -1;
+
+  // keeps track of the contiguous directories that need to be removed to
+  // avoid calling beginRemoveRows(), etc. for each item
+  Range range(this, parentItem);
+
+  // for each item in this tree item
+  while (itor != children.end()) {
+    const auto& item = *itor;
+
+    if (!item->isDirectory()) {
+      if (firstFileRow == -1) {
+        firstFileRow = range.current();
+      }
+
+      auto f = parentEntry.findFile(item->key());
+
+      if (f && shouldShowFile(*f)) {
+        trace(log::debug("file {} still there", item->filename()));
+
+        // file is still there
+        seen.emplace(f->getIndex());
+
+        if (f->getOrigin() != item->originID()) {
+          // origin has changed
+          updateFileItem(*item, *f);
+        }
+
+        // if there were files before this row that need to be removed,
+        // do it now
+        itor = range.remove();
+      } else {
+        // file is gone from the parent entry
+        trace(log::debug("file {} is gone", item->filename()));
+
+        range.includeCurrent();
+        ++itor;
+      }
+    } else {
+      ++itor;
+    }
+
+    range.next();
+  }
+
+  // remove the last file range, if any
+  range.remove();
+
+  if (firstFileRow == -1) {
+    firstFileRow = static_cast<int>(children.size());
+  }
+}
+
+bool FileTreeModel::addNewFiles(
+  FileTreeItem& parentItem, const MOShared::DirectoryEntry& parentEntry,
+  const std::wstring& parentPath, const int firstFileRow,
+  const std::unordered_set<FileEntry::Index>& seen)
+{
+  // keeps track of the contiguous files that need to be added to
+  // avoid calling beginAddRows(), etc. for each item
+  std::vector<FileTreeItem::Ptr> toAdd;
+  Range range(this, parentItem, firstFileRow);
+  bool added = false;
+
+  // for each directory on the filesystem
+  parentEntry.forEachFileIndex([&](auto&& fileIndex) {
+    if (seen.contains(fileIndex)) {
+      // already seen in the parent item
+
+      // if there were directories before this row that need to be added,
+      // do it now
+      range.add(std::move(toAdd));
+      toAdd.clear();
+    } else {
+      const auto file = parentEntry.getFileByIndex(fileIndex);
+
+      if (!file) {
+        log::error(
+          "FileTreeModel::addNewFiles(): file index {} in path {} not found",
+          fileIndex, parentPath);
+
+        return true;
+      }
+
+      if (shouldShowFile(*file)) {
+        // this is a new file
+        trace(log::debug("new file {}", QString::fromStdWString(file->getName())));
+
+        toAdd.push_back(createFileItem(parentItem, parentPath, *file));
+        added = true;
+
+        range.includeCurrent();
+      } else {
+        // this is a new file, but it shouldn't be shown
+        trace(log::debug("new file {}, not shown", QString::fromStdWString(file->getName())));
+        return true;
+      }
+    }
+
+    range.next();
+
+    return true;
+  });
+
+  // add the last file range, if any
+  range.add(std::move(toAdd));
+
+  return added;
+}
+
+FileTreeItem::Ptr FileTreeModel::createDirectoryItem(
+  FileTreeItem& parentItem, const std::wstring& parentPath,
+  const DirectoryEntry& d)
+{
+  auto item = FileTreeItem::createDirectory(
+    this, &parentItem, parentPath, d.getName());
+
+  if (d.isEmpty()) {
+    // if this directory is empty, mark the item as loaded so the expand
+    // arrow doesn't show
+    item->setLoaded(true);
+  }
+
+  return item;
+}
+
+FileTreeItem::Ptr FileTreeModel::createFileItem(
+  FileTreeItem& parentItem, const std::wstring& parentPath,
+  const FileEntry& file)
+{
+  auto item = FileTreeItem::createFile(
+    this, &parentItem, parentPath, file.getName());
+
+  updateFileItem(*item, file);
+
+  item->setLoaded(true);
+
+  return item;
+}
+
+void FileTreeModel::updateFileItem(
+  FileTreeItem& item, const MOShared::FileEntry& file)
+{
+  bool isArchive = false;
+  int originID = file.getOrigin(isArchive);
+
+  FileTreeItem::Flags flags = FileTreeItem::NoFlags;
+
+  if (isArchive) {
+    flags |= FileTreeItem::FromArchive;
+  }
+
+  if (!file.getAlternatives().empty()) {
+    flags |= FileTreeItem::Conflicted;
+  }
+
+  item.setOrigin(
+    originID, file.getFullPath(), flags, makeModName(file, originID));
+
+  if (file.getFileSize() != FileEntry::NoFileSize) {
+    item.setFileSize(file.getFileSize());
+  }
+
+  if (file.getCompressedFileSize() != FileEntry::NoFileSize) {
+    item.setCompressedFileSize(file.getCompressedFileSize());
+  }
+}
+
+bool FileTreeModel::shouldShowFile(const FileEntry& file) const
+{
+  if (showConflictsOnly() && (file.getAlternatives().size() == 0)) {
+    // only conflicts should be shown, but this file is not conflicted
+    return false;
+  }
+
+  if (!showArchives() && file.isFromArchive()) {
+    // files from archives shouldn't be shown, but this file is from an archive
+    return false;
+  }
+
+  return true;
+}
+
+bool FileTreeModel::shouldShowFolder(
+  const DirectoryEntry& dir, const FileTreeItem* item) const
+{
+  bool shouldPrune = m_flags.testFlag(PruneDirectories);
+
+  if (m_core.settings().archiveParsing()) {
+    if (!m_flags.testFlag(Archives)) {
+      // archive parsing is enabled but the tree shouldn't show archives; this
+      // is a bit of a special case for folders because they have to be hidden
+      // regardless of the PruneDirectories flag if they only exist in archives
+      //
+      // note that this test is inaccurate: if a loose folder exists but is
+      // empty, and the same folder exists in an archive but is _not_ empty,
+      // then it's considered to exist _only_ in an archive and will be pruned
+      //
+      // if directories are ever made first-class so they can retain their
+      // origins, this test can be made more accurate
+      shouldPrune = true;
+    }
+  }
+
+  if (!shouldPrune) {
+    // always show folders regardless of their content
+    return true;
+  }
+
+  if (item) {
+    if (item->isLoaded() && item->children().empty()) {
+      // item is loaded and has no children; prune it
+      return false;
+    }
+  }
+
+  bool foundFile = false;
+
+  // check all files in this directory, return early if a file should be shown
+  dir.forEachFile([&](auto&& f) {
+    if (shouldShowFile(f)) {
+      foundFile = true;
+
+      // stop
+      return false;
+    }
+
+    // continue
+    return true;
+  });
+
+  if (foundFile) {
+    return true;
+  }
+
+  // recurse into subdirectories
+  for (auto subdir : dir.getSubDirectories()) {
+    if (shouldShowFolder(*subdir, nullptr)) {
+      return true;
+    }
+  }
+
+  return false;
+}
+
+QVariant FileTreeModel::displayData(const FileTreeItem* item, int column) const
+{
+  switch (column)
+  {
+    case FileName:
+    {
+      return item->filename();
+    }
+
+    case ModName:
+    {
+      return item->mod();
+    }
+
+    case FileType:
+    {
+      return item->fileType().value_or(QString());
+    }
+
+    case FileSize:
+    {
+      if (item->isDirectory()) {
+        return {};
+      } else {
+        QString fs;
+
+        if (auto n=item->fileSize()) {
+          fs = localizedByteSize(*n);
+        }
+
+        if (auto n=item->compressedFileSize()) {
+          return QString("%1 (%2)").arg(fs).arg(localizedByteSize(*n));
+        } else {
+          return fs;
+        }
+      }
+    }
+
+    case LastModified:
+    {
+      if (auto d=item->lastModified()) {
+        if (d->isValid()) {
+          return d->toString(Qt::SystemLocaleDate);
+        }
+      }
+
+      return {};
+    }
+
+    default:
+    {
+      return {};
+    }
+  }
+}
+
+std::wstring FileTreeModel::makeModName(
+  const MOShared::FileEntry& file, int originID) const
+{
+  static const std::wstring Unmanaged = UnmanagedModName().toStdWString();
+
+  const auto origin = m_core.directoryStructure()->getOriginByID(originID);
+
+  if (origin.getID() == 0) {
+    return Unmanaged;
+  }
+
+  std::wstring name = origin.getName();
+
+  const auto& archive = file.getArchive();
+  if (!archive.first.empty()) {
+    name += L" (" + archive.first + L")";
+  }
+
+  return name;
+}
+
+QString FileTreeModel::makeTooltip(const FileTreeItem& item) const
+{
+  auto nowrap = [&](auto&& s) {
+    return "<p style=\"white-space: pre; margin: 0; padding: 0;\">" + s + "</p>";
+  };
+
+  auto line = [&](auto&& caption, auto&& value) {
+    if (value.isEmpty()) {
+      return nowrap("<b>" + caption + ":</b>\n");
+    } else {
+      return nowrap("<b>" + caption + ":</b> " + value.toHtmlEscaped()) + "\n";
+    }
+  };
+
+
+  if (item.isDirectory()) {
+    return
+      line(tr("Directory"), item.filename()) +
+      line(tr("Virtual path"), item.virtualPath());
+  }
+
+
+  static const QString ListStart =
+    "<ul style=\""
+    "margin-left: 20px; "
+    "margin-top: 0; "
+    "margin-bottom: 0; "
+    "padding: 0; "
+    "-qt-list-indent: 0;"
+    "\">";
+
+  static const QString ListEnd = "</ul>";
+
+
+  QString s =
+    line(tr("Virtual path"), item.virtualPath()) +
+    line(tr("Real path"),    item.realPath()) +
+    line(tr("From"),         item.mod());
+
+
+  const auto file = m_core.directoryStructure()->searchFile(
+    item.dataRelativeFilePath().toStdWString(), nullptr);
+
+  if (file) {
+    const auto alternatives = file->getAlternatives();
+    QStringList list;
+
+    for (auto&& alt : file->getAlternatives()) {
+      const auto& origin = m_core.directoryStructure()->getOriginByID(alt.first);
+      list.push_back(QString::fromStdWString(origin.getName()));
+    }
+
+    if (list.size() == 1) {
+      s += line(tr("Also in"), list[0]);
+    } else if (list.size() >= 2) {
+      s += line(tr("Also in"), QString()) + ListStart;
+
+      for (auto&& alt : list) {
+        s += "<li>" + alt +"</li>";
+      }
+
+      s += ListEnd;
+    }
+  }
+
+  return s;
+}
+
+QVariant FileTreeModel::makeIcon(
+  const FileTreeItem& item, const QModelIndex& index) const
+{
+  if (item.isDirectory()) {
+    return m_iconFetcher.genericDirectoryIcon();
+  }
+
+  auto v = m_iconFetcher.icon(item.realPath());
+  if (!v.isNull()) {
+    return v;
+  }
+
+  m_iconPending.push_back(index);
+  m_iconPendingTimer.start(std::chrono::milliseconds(1));
+
+  return m_iconFetcher.genericFileIcon();
+}
+
+void FileTreeModel::updatePendingIcons()
+{
+  std::vector<QModelIndex> v(std::move(m_iconPending));
+  m_iconPending.clear();
+
+  for (auto&& index : v) {
+    emit dataChanged(index, index, {Qt::DecorationRole});
+  }
+
+  if (m_iconPending.empty()) {
+    m_iconPendingTimer.stop();
+  }
+}
+
+void FileTreeModel::removePendingIcons(
+  const QModelIndex& parent, int first, int last)
+{
+  auto itor = m_iconPending.begin();
+
+  while (itor != m_iconPending.end()) {
+    if (itor->parent() == parent) {
+      if (itor->row() >= first && itor->row() <= last) {
+        itor = m_iconPending.erase(itor);
+        continue;
+      }
+    }
+
+    ++itor;
+  }
+}