Basic plugin infastructure and a sample simple plugin.

src/include/workspace.h

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+/* -*- mode: C; c-file-style: "gnu"; indent-tabs-mode: nil; -*- */
+
+/**
+ * \file workspace.h    Workspaces
+ *
+ * A workspace is a set of windows which all live on the same
+ * screen.  (You may also see the name "desktop" around the place,
+ * which is the EWMH's name for the same thing.)  Only one workspace
+ * of a screen may be active at once; all windows on all other workspaces
+ * are unmapped.
+ */
+
+/*
+ * Copyright (C) 2001 Havoc Pennington
+ * Copyright (C) 2004, 2005 Elijah Newren
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of the
+ * License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
+ * 02111-1307, USA.
+ */
+
+#ifndef META_WORKSPACE_H
+#define META_WORKSPACE_H
+
+#include "types.h"
+#include "boxes.h"
+#include "screen.h"
+
+int  meta_workspace_index (MetaWorkspace *workspace);
+MetaScreen *meta_workspace_get_screen (MetaWorkspace *workspace);
+void meta_workspace_get_work_area_all_xineramas (MetaWorkspace *workspace,
+                                                 MetaRectangle *area);
+#endif