intial commit

source/mijin/virtual_filesystem/stacked.cpp

@@ -0,0 +1,105 @@
+
+#include "./stacked.hpp"
+
+#include <algorithm>
+
+namespace mijin
+{
+
+//
+// internal defines
+//
+
+//
+// internal constants
+//
+
+//
+// internal types
+//
+
+//
+// internal variables
+//
+
+//
+// internal functions
+//
+
+//
+// public functions
+//
+
+std::vector<fs::path> StackedFileSystemAdapter::getRoots()
+{
+    std::vector<fs::path> roots;
+
+    for (auto& adapter : adapters_)
+    {
+        for (const fs::path& root : adapter->getRoots())
+        {
+            auto it = std::find(roots.begin(), roots.end(), root);
+            if (it == roots.end()) {
+                roots.push_back(root);
+            }
+        }
+    }
+
+    return roots;
+}
+
+fs::path StackedFileSystemAdapter::getHomeFolder()
+{
+    if (adapters_.empty()) {
+        return fs::path();
+    }
+    return adapters_.front()->getHomeFolder();
+}
+
+std::vector<FileInfo> StackedFileSystemAdapter::listFiles(const fs::path& folder)
+{
+    std::vector<FileInfo> files;
+
+    for (auto& adapter : adapters_)
+    {
+        for (const FileInfo& file : adapter->listFiles(folder))
+        {
+            auto it = std::find_if(files.begin(), files.end(), [&](const FileInfo& existing)
+            {
+                return existing.path == file.path;
+            });
+            if (it != files.end()) {
+                files.push_back(file);
+            }
+        }
+    }
+
+    return files;
+}
+
+FileInfo StackedFileSystemAdapter::getFileInfo(const fs::path& file)
+{
+    for (auto& adapter : adapters_)
+    {
+        FileInfo fileInfo = adapter->getFileInfo(file);
+        if (fileInfo.exists) {
+            return fileInfo;
+        }
+    }
+
+    return {};
+}
+
+StreamError StackedFileSystemAdapter::open(const fs::path& path, FileOpenMode mode, std::unique_ptr<Stream>& outStream)
+{
+    for (auto& adapter : adapters_)
+    {
+        FileInfo fileInfo = adapter->getFileInfo(path);
+        if (fileInfo.exists) {
+            return adapter->open(path, mode, outStream);
+        }
+    }
+    return StreamError::IO_ERROR;
+}
+
+} // namespace mijin