[wip] New filesystem abstraction library.

src/Corrade/CMakeLists.txt

@@ -52,6 +52,10 @@ if(WITH_UTILITY) # Cyclic dependency of Containers and Utility
     add_subdirectory(Containers)
 endif()
 
+if(WITH_FILESYSTEM)
+    add_subdirectory(Filesystem)
+endif()
+
 if(WITH_INTERCONNECT)
     add_subdirectory(Interconnect)
 endif()

src/Corrade/Filesystem/AbstractFilesystem.h

@@ -0,0 +1,138 @@
+#ifndef Corrade_Filesystem_AbstractFilesystem_h
+#define Corrade_Filesystem_AbstractFilesystem_h
+/*
+    This file is part of Corrade.
+
+    Copyright © 2007, 2008, 2009, 2010, 2011, 2012, 2013, 2014, 2015, 2016,
+                2017 Vladimír Vondruš <[email protected]>
+
+    Permission is hereby granted, free of charge, to any person obtaining a
+    copy of this software and associated documentation files (the "Software"),
+    to deal in the Software without restriction, including without limitation
+    the rights to use, copy, modify, merge, publish, distribute, sublicense,
+    and/or sell copies of the Software, and to permit persons to whom the
+    Software is furnished to do so, subject to the following conditions:
+
+    The above copyright notice and this permission notice shall be included
+    in all copies or substantial portions of the Software.
+
+    THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+    IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+    FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+    THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+    LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+    FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+    DEALINGS IN THE SOFTWARE.
+*/
+
+/** @file
+ * @brief Class @ref Corrade::Filesystem::AbstractFilesystem
+ */
+
+#include <future>
+
+#include "Corrade/PluginManager/AbstractPlugin.h"
+
+namespace Corrade { namespace Filesystem {
+
+/**
+@todo What we want:
+- make this usable from multi-file importers, which would do the stuff synchronously ?! This won't be useful in Emscripten...
+- have the sync versions at all? if yes, fire assert on them when the plugin is async?
+*/
+class AbstractFilesystem: public PluginManager::AbstractPlugin {
+    CORRADE_PLUGIN_INTERFACE("cz.mosra.corrade.Filesystem.AbstractFilesystem/1.0")
+
+    public:
+        enum class Feature: std::uint32_t {
+            OpenPath = 1 << 0,
+            OpenData = 1 << 1,
+            Write = 1 << 2,
+            Hierarchic = 1 << 3, // ?
+            ListDirectories = 1 << 4,
+            CreateFiles = 1 << 5,
+            Asynchronous = 1 << 6
+        };
+
+        typedef Containers::EnumSet<Feature> Features;
+
+        std::string configurationDir() const; // w/o opening?
+        std::string home() const; // w/o opening?
+
+        Features features() const { return doFeatures(); }
+
+        bool isOpened() const;
+
+        bool openPath(const std::string& path);
+
+        bool openData(Containers::ArrayView<const char> data, const std::string& path = {});
+
+        void close();
+
+        /** @{ @name Filesystem manipulation */
+
+        std::vector<std::string> list(const std::string& path = {}) const;
+
+        std::future<std::vector<std::string>> listAsync(const std::string& path = {}) const;
+
+        bool fileExists(const std::string& file) const;
+
+        std::future<bool> fileExistsAsync(const std::string& file) const;
+
+        bool createPath(const std::string& path);
+
+        std::future<bool> createPathAsync(const std::string& path);
+
+        bool remove(const std::string& path);
+
+        std::future<bool> removeAsync(const std::string& path);
+
+        bool move(const std::string& oldPath, const std::string& newPath);
+
+        std::future<bool> moveAsync(const std::string& oldPath, const std::string& newPath);
+
+        /*@}*/
+
+        /** @{ @name File manipulation */
+
+        Containers::Array<char> read(const std::string& file);
+
+        std::string readString(const std::string& file);
+
+        bool write(const std::string& file, Containers::ArrayView<const char> data);
+
+        bool writeString(const std::string& file, const std::string& data);
+
+        /*@}*/
+
+    private:
+        virtual Features doFeatures() const = 0;
+
+        virtual bool doIsOpened() = 0;
+
+        virtual void doOpenPath(const std::string& path);
+
+        virtual void doOpenData(Containers::ArrayView<const char> data, const std::string& path = {});
+
+        virtual void doClose() = 0;
+
+        virtual std::vector<std::string> doList(const std::string& path) const;
+
+        virtual bool doFileExists(const std::string& file) const;
+
+        virtual bool doCreatePath(const std::string& path);
+
+        virtual bool doRemove(const std::string& path);
+
+        virtual bool doMove(const std::string& oldPath, const std::string& newPath);
+
+        virtual Containers::Array<char> read(const std::string& file);
+
+        virtual bool write(const std::string& file, Containers::ArrayView<char> data);
+};
+
+CORRADE_ENUMSET_OPERATORS(AbstractFilesystem::Feature)
+
+}}
+
+#endif