Major plugin refactor and cleanup.

Switched to POCO library for unified platform/library interface.
Deprecated the external module API. It was creating more problems than solving.
Removed most built-in libraries in favor of system libraries for easier maintenance.
Cleaned and secured code with help from static analyzers.

vendor/POCO/Foundation/include/Poco/DirectoryWatcher.h

@@ -0,0 +1,232 @@
+//
+// DirectoryWatcher.h
+//
+// Library: Foundation
+// Package: Filesystem
+// Module:  DirectoryWatcher
+//
+// Definition of the DirectoryWatcher class.
+//
+// Copyright (c) 2012, Applied Informatics Software Engineering GmbH.
+// and Contributors.
+//
+// SPDX-License-Identifier:	BSL-1.0
+//
+
+
+#ifndef Foundation_DirectoryWatcher_INCLUDED
+#define Foundation_DirectoryWatcher_INCLUDED
+
+
+#include "Poco/Foundation.h"
+
+
+#ifndef POCO_NO_INOTIFY
+
+
+#include "Poco/File.h"
+#include "Poco/BasicEvent.h"
+#include "Poco/Runnable.h"
+#include "Poco/Thread.h"
+#include "Poco/AtomicCounter.h"
+
+
+namespace Poco {
+
+
+class DirectoryWatcherStrategy;
+
+
+class Foundation_API DirectoryWatcher: protected Runnable
+	/// This class is used to get notifications about changes
+	/// to the filesystem, more specifically, to a specific
+	/// directory. Changes to a directory are reported via
+	/// events.
+	///
+	/// A thread will be created that watches the specified
+	/// directory for changes. Events are reported in the context
+	/// of this thread. 
+	///
+	/// Note that changes to files in subdirectories of the watched
+	/// directory are not reported. Separate DirectoryWatcher objects
+	/// must be created for these directories if they should be watched.
+	///
+	/// Changes to file attributes are not reported.
+	///
+	/// On Windows, this class is implemented using FindFirstChangeNotification()/FindNextChangeNotification().
+	/// On Linux, this class is implemented using inotify.
+	/// On FreeBSD and Darwin (Mac OS X, iOS), this class uses kevent/kqueue.
+	/// On all other platforms, the watched directory is periodically scanned
+	/// for changes. This can negatively affect performance if done too often.
+	/// Therefore, the interval in which scans are done can be specified in
+	/// the constructor. Note that periodic scanning will also be done on FreeBSD
+	/// and Darwin if events for changes to files (DW_ITEM_MODIFIED) are enabled.
+	///
+	/// DW_ITEM_MOVED_FROM and DW_ITEM_MOVED_TO events will only be reported
+	/// on Linux. On other platforms, a file rename or move operation
+	/// will be reported via a DW_ITEM_REMOVED and a DW_ITEM_ADDED event.
+	/// The order of these two events is not defined.
+	///
+	/// An event mask can be specified to enable only certain events.
+{
+public:
+	enum DirectoryEventType
+	{
+		DW_ITEM_ADDED = 1,
+			/// A new item has been created and added to the directory.
+			
+		DW_ITEM_REMOVED = 2,
+			/// An item has been removed from the directory.
+
+		DW_ITEM_MODIFIED = 4,
+			/// An item has been modified.
+
+		DW_ITEM_MOVED_FROM = 8,
+			/// An item has been renamed or moved. This event delivers the old name.
+
+		DW_ITEM_MOVED_TO = 16
+			/// An item has been renamed or moved. This event delivers the new name.
+	};
+
+	enum DirectoryEventMask
+	{
+		DW_FILTER_ENABLE_ALL = 31,
+			/// Enables all event types.
+
+		DW_FILTER_DISABLE_ALL = 0
+			/// Disables all event types.
+	};
+	
+	enum
+	{
+		DW_DEFAULT_SCAN_INTERVAL = 5 /// Default scan interval for platforms that don't provide a native notification mechanism.
+	};
+	
+	struct DirectoryEvent
+	{
+		DirectoryEvent(const File& f, DirectoryEventType ev):
+			item(f),
+			event(ev)
+		{
+		}
+
+		const File& item;          /// The directory or file that has been changed.
+		DirectoryEventType event;  /// The kind of event.
+	};
+	
+	BasicEvent<const DirectoryEvent> itemAdded;
+		/// Fired when a file or directory has been created or added to the directory.
+		
+	BasicEvent<const DirectoryEvent> itemRemoved;
+		/// Fired when a file or directory has been removed from the directory.
+		
+	BasicEvent<const DirectoryEvent> itemModified;
+		/// Fired when a file or directory has been modified.
+
+	BasicEvent<const DirectoryEvent> itemMovedFrom;
+		/// Fired when a file or directory has been renamed. This event delivers the old name.
+
+	BasicEvent<const DirectoryEvent> itemMovedTo;
+		/// Fired when a file or directory has been moved. This event delivers the new name.
+		
+	BasicEvent<const Exception> scanError;
+		/// Fired when an error occurs while scanning for changes.
+	
+	DirectoryWatcher(const std::string& path, int eventMask = DW_FILTER_ENABLE_ALL, int scanInterval = DW_DEFAULT_SCAN_INTERVAL);
+		/// Creates a DirectoryWatcher for the directory given in path.
+		/// To enable only specific events, an eventMask can be specified by
+		/// OR-ing the desired event IDs (e.g., DW_ITEM_ADDED | DW_ITEM_MODIFIED).
+		/// On platforms where no native filesystem notifications are available,
+		/// scanInterval specifies the interval in seconds between scans
+		/// of the directory.
+		
+	DirectoryWatcher(const File& directory, int eventMask = DW_FILTER_ENABLE_ALL, int scanInterval = DW_DEFAULT_SCAN_INTERVAL);
+		/// Creates a DirectoryWatcher for the specified directory
+		/// To enable only specific events, an eventMask can be specified by
+		/// OR-ing the desired event IDs (e.g., DW_ITEM_ADDED | DW_ITEM_MODIFIED).
+		/// On platforms where no native filesystem notifications are available,
+		/// scanInterval specifies the interval in seconds between scans
+		/// of the directory.
+
+	~DirectoryWatcher();
+		/// Destroys the DirectoryWatcher.
+		
+	void suspendEvents();
+		/// Suspends sending of events. Can be called multiple times, but every
+		/// call to suspendEvent() must be matched by a call to resumeEvents().
+		
+	void resumeEvents();
+		/// Resumes events, after they have been suspended with a call to suspendEvents().
+		
+	bool eventsSuspended() const;
+		/// Returns true iff events are suspended.
+		
+	int eventMask() const;
+		/// Returns the value of the eventMask passed to the constructor.
+		
+	int scanInterval() const;
+		/// Returns the scan interval in seconds.
+		
+	const File& directory() const;
+		/// Returns the directory being watched.
+		
+	bool supportsMoveEvents() const;
+		/// Returns true iff the platform supports DW_ITEM_MOVED_FROM/itemMovedFrom and
+		/// DW_ITEM_MOVED_TO/itemMovedTo events.
+	
+protected:
+	void init();
+	void stop();
+	void run();
+
+private:
+	DirectoryWatcher();
+	DirectoryWatcher(const DirectoryWatcher&);
+	DirectoryWatcher& operator = (const DirectoryWatcher&);
+
+	Thread _thread;
+	File _directory;
+	int _eventMask;
+	AtomicCounter _eventsSuspended;
+	int _scanInterval;
+	DirectoryWatcherStrategy* _pStrategy;
+};
+
+
+//
+// inlines
+//
+
+
+inline bool DirectoryWatcher::eventsSuspended() const
+{
+	return _eventsSuspended.value() > 0;
+}
+
+
+inline int DirectoryWatcher::eventMask() const
+{
+	return _eventMask;
+}
+
+
+inline int DirectoryWatcher::scanInterval() const
+{
+	return _scanInterval;
+}
+
+
+inline const File& DirectoryWatcher::directory() const
+{
+	return _directory;
+}
+
+
+} // namespace Poco
+
+
+#endif // POCO_NO_INOTIFY
+
+
+#endif // Foundation_DirectoryWatcher_INCLUDED
+