Implement initial Unity-style asset library cache

editor/src/Managers/ProjectManager.cpp

@@ -121,6 +121,27 @@ fs::path MakeCaseOnlyRenameTempPath(const fs::path& sourcePath) {
     }
 }
 
+fs::path GetMetaSidecarPath(const fs::path& assetPath) {
+    return fs::path(assetPath.wstring() + L".meta");
+}
+
+bool RenamePathCaseAware(const fs::path& sourcePath, const fs::path& destPath);
+
+void MoveMetaSidecarIfPresent(const fs::path& sourcePath, const fs::path& destPath) {
+    const fs::path sourceMetaPath = GetMetaSidecarPath(sourcePath);
+    if (!fs::exists(sourceMetaPath)) {
+        return;
+    }
+
+    const fs::path destMetaPath = GetMetaSidecarPath(destPath);
+    RenamePathCaseAware(sourceMetaPath, destMetaPath);
+}
+
+void RemoveMetaSidecarIfPresent(const fs::path& assetPath) {
+    std::error_code ec;
+    fs::remove_all(GetMetaSidecarPath(assetPath), ec);
+}
+
 bool RenamePathCaseAware(const fs::path& sourcePath, const fs::path& destPath) {
     if (MakePathKey(sourcePath) != MakePathKey(destPath)) {
         if (fs::exists(destPath)) {
@@ -383,6 +404,7 @@ bool ProjectManager::DeleteItem(const std::string& fullPath) {
         }
 
         fs::remove_all(itemPath);
+        RemoveMetaSidecarIfPresent(itemPath);
         if (m_selectedItemPath == fullPath) {
             ClearSelection();
         }
@@ -422,6 +444,7 @@ bool ProjectManager::MoveItem(const std::string& sourceFullPath, const std::stri
         }
 
         fs::rename(sourcePath, destPath);
+        MoveMetaSidecarIfPresent(sourcePath, destPath);
         RefreshCurrentFolder();
         return true;
     } catch (...) {
@@ -458,6 +481,7 @@ bool ProjectManager::RenameItem(const std::string& sourceFullPath, const std::st
         if (!RenamePathCaseAware(sourcePath, destPath)) {
             return false;
         }
+        MoveMetaSidecarIfPresent(sourcePath, destPath);
 
         if (!m_selectedItemPath.empty() &&
             MakePathKey(Utf8PathToWstring(m_selectedItemPath)) == MakePathKey(sourcePath))
@@ -501,6 +525,13 @@ AssetItemPtr ProjectManager::ScanDirectory(const std::wstring& path) {
     try {
         for (const auto& entry : fs::directory_iterator(path)) {
             std::wstring nameW = entry.path().filename().wstring();
+            if (!entry.is_directory()) {
+                std::wstring lowerName = nameW;
+                std::transform(lowerName.begin(), lowerName.end(), lowerName.begin(), ::towlower);
+                if (lowerName.size() >= 5 && lowerName.substr(lowerName.size() - 5) == L".meta") {
+                    continue;
+                }
+            }
             bool isFolder = entry.is_directory();
             items.push_back(CreateAssetItem(entry.path().wstring(), nameW, isFolder));
         }