Issue 5183 - Provide async interface for FileSystem

include/AdblockPlus/FileSystem.h

Index: include/AdblockPlus/FileSystem.h
===================================================================
--- a/include/AdblockPlus/FileSystem.h
+++ b/include/AdblockPlus/FileSystem.h
@@ -18,58 +18,26 @@
 #ifndef ADBLOCK_PLUS_FILE_SYSTEM_H
 #define ADBLOCK_PLUS_FILE_SYSTEM_H
 
 #include <istream>
 #include <stdint.h>
 #include <string>
 #include <memory>
 
+#include "IFileSystem.h"
+
 namespace AdblockPlus
 {
   /**
    * File system interface.
    */
   class FileSystem
   {
   public:
-    /**
-     * Result of a stat operation, i.e.\ information about a file.
-     */
-    struct StatResult
-    {
-      StatResult()
-      {
-        exists = false;
-        isDirectory = false;
-        isFile = false;
-        lastModified = 0;
-      }
-
-      /**
-       * File exists.
-       */
-      bool exists;
-
-      /**
-       * File is a directory.
-       */
-      bool isDirectory;
-
-      /**
-       * File is a regular file.
-       */
-      bool isFile;
-
-      /**
-       * POSIX time of the last modification.
-       */
-      int64_t lastModified;
-    };
-
     virtual ~FileSystem() {}
 
     /**
      * Reads from a file.
      * @param path File path.
      * @return Input stream with the file's contents.
      */
     virtual std::shared_ptr<std::istream>
@@ -97,25 +65,25 @@
      */
     virtual void Remove(const std::string& path) = 0;
 
     /**
      * Retrieves information about a file.
      * @param path File path.
      * @return File information.
      */
-    virtual StatResult Stat(const std::string& path) const = 0;
+    virtual IFileSystem::StatResult Stat(const std::string& path) const = 0;
 
     /**
      * Returns the absolute path to a file.
      * @param path File path (can be relative or absolute).
      * @return Absolute file path.
      */
     virtual std::string Resolve(const std::string& path) const = 0;
   };
 
   /**
    * Shared smart pointer to a `FileSystem` instance.
    */
-  typedef std::shared_ptr<FileSystem> FileSystemPtr;
+  typedef std::shared_ptr<FileSystem> FileSystemSyncPtr;
 }
 
 #endif