DirectoryWatcher.h

#pragma once
 
#include <Foundation/Basics.h>
 
#if PL_ENABLED(PL_SUPPORTS_DIRECTORY_WATCHER)
 
#  include <Foundation/Basics.h>
#  include <Foundation/Strings/String.h>
#  include <Foundation/Types/Bitflags.h>
#  include <Foundation/Types/Delegate.h>
 
struct plDirectoryWatcherImpl;
 
enum class plDirectoryWatcherAction
{
  None,           
  Added,          
  Removed,        
  Modified,       
  RenamedOldName, 
  RenamedNewName, 
};
 
enum class plDirectoryWatcherType
{
  File,
  Directory
};
 
class PL_FOUNDATION_DLL plDirectoryWatcher
{
public:
  struct Watch
  {
    using StorageType = plUInt8;
    constexpr static plUInt8 Default = 0;
 
    enum Enum
    {
      Writes = PL_BIT(0),         
      Creates = PL_BIT(1),        
      Deletes = PL_BIT(2),        
      Renames = PL_BIT(3),        
      Subdirectories = PL_BIT(4), 
    };
 
    struct Bits
    {
      StorageType Writes : 1;
      StorageType Creates : 1;
      StorageType Deletes : 1;
      StorageType Renames : 1;
      StorageType Subdirectories : 1;
    };
  };
 
  plDirectoryWatcher();
  plDirectoryWatcher(const plDirectoryWatcher&) = delete;
  plDirectoryWatcher(plDirectoryWatcher&&) noexcept = delete;
  ~plDirectoryWatcher();
 
  plDirectoryWatcher& operator=(const plDirectoryWatcher&) = delete;
  plDirectoryWatcher& operator=(plDirectoryWatcher&&) noexcept = delete;
 
  plResult OpenDirectory(plStringView sAbsolutePath, plBitflags<Watch> whatToWatch);
 
  void CloseDirectory();
 
  plStringView GetDirectory() const { return m_sDirectoryPath; }
 
  using EnumerateChangesFunction = plDelegate<void(plStringView sFilename, plDirectoryWatcherAction action, plDirectoryWatcherType type), 48>;
 
  void EnumerateChanges(EnumerateChangesFunction func, plTime waitUpTo = plTime::MakeZero());
 
  static void EnumerateChanges(plArrayPtr<plDirectoryWatcher*> watchers, EnumerateChangesFunction func, plTime waitUpTo = plTime::MakeZero());
 
private:
  plString m_sDirectoryPath;
  plDirectoryWatcherImpl* m_pImpl = nullptr;
};
 
PL_DECLARE_FLAGS_OPERATORS(plDirectoryWatcher::Watch);
 
#endif