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diff --git a/src/setup/gnunet-setup-options.h b/src/setup/gnunet-setup-options.h
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+++ b/src/setup/gnunet-setup-options.h
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+/*
+     This file is part of GNUnet.
+     (C) 2010 Christian Grothoff (and other contributing authors)
+
+     GNUnet 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, or (at your
+     option) any later version.
+
+     GNUnet 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 GNUnet; see the file COPYING.  If not, write to the
+     Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+     Boston, MA 02111-1307, USA.
+*/
+
+/**
+ * @file src/gnunet-setup-options.h
+ * @brief configuration details
+ * @author Christian Grothoff
+ */
+#ifndef GNUNET_SETUP_OPTIONS_H
+#define GNUNET_SETUP_OPTIONS_H
+
+#include "gnunet-setup.h"
+
+
+/**
+ * Function to setup the value on load.
+ *
+ * @param cls closure
+ * @param section section with the value
+ * @param option option name
+ * @param value value as a string
+ * @param widget widget to initialize
+ * @param cfg configuration handle
+ * @return GNUNET_OK on success, GNUNET_SYSERR if there was a problem
+ */
+typedef int (*GNUNET_SETUP_LoadFunction)(const void *cls,
+                                         const char *section,
+                                         const char *option,
+                                         const char *value,
+                                         GObject *widget,
+                                         const struct GNUNET_CONFIGURATION_Handle *cfg);
+
+
+/**
+ * Modify the configuration to contain the right value for
+ * the option based on the state of the widget.
+ * 
+ * @param cls closure
+ * @param section section with the value
+ * @param option option name
+ * @param widget widget to initialize
+ * @param cfg configuration handle to update
+ * @return GNUNET_OK on success, GNUNET_SYSERR if there was a problem
+ */
+typedef int (*GNUNET_SETUP_SaveFunction)(const void *cls,
+                                         const char *section,
+                                         const char *option,
+                                         GObject *widget,
+                                         struct GNUNET_CONFIGURATION_Handle *cfg);
+
+
+/**
+ * Structs of this type specify under which conditions the values of
+ * a particular option impact the visibility (or sensitivity) of some
+ * other widget.
+ */
+struct GNUNET_SETUP_VisibilitySpecification
+{
+  /**
+   * Which widget should be changed?
+   */
+  const char *widget_name;
+
+  /**
+   * If the option value matchis this regex, the widget should be
+   * shown.  If NULL, the "hide_value" controls visibility.
+   */
+  const char *show_value;
+
+  /**
+   * If the option value matchis this regex, the widget should be
+   * hidden.  If NULL, the "show_value" controls visibility.
+   */  
+  const char *hide_value;
+
+};
+
+
+/**
+ * Structs of this type define how widgets relate to GNUnet options
+ * and control visibility and special actions.
+ */
+struct GNUNET_SETUP_OptionSpecification
+{
+  /**
+   * Name of the GTK widget in Glade.
+   */
+  const char *widget_name;
+
+  /**
+   * Name of the signal the widget emits if its state changes.
+   */
+  const char *change_signal;
+
+  /**
+   * Section in the configuration
+   */
+  const char *section;
+
+  /**
+   * Name of the configuration option.
+   */
+  const char *option;
+
+  /**
+   * Help text to display for this option.
+   */
+  const char *help_text;
+
+  /**
+   * Help URL to link to for this option.
+   */
+  const char *help_url;
+
+  /**
+   * Function to call to initialize the widget from the configuration.
+   */
+  GNUNET_SETUP_LoadFunction load_function;
+
+  /**
+   * Function to call set the configuration from the widget.
+   */
+  GNUNET_SETUP_SaveFunction save_function;
+
+  /**
+   * Closure for 'validation_function'.
+   */
+  const void *load_save_cls;
+
+  /**
+   * Visibility changes to apply if this option changes (NULL, or
+   * NULL-terminated).
+   */
+  const struct GNUNET_SETUP_VisibilitySpecification *visibility;
+
+};
+
+
+/**
+ * Option specification data.
+ */
+extern const struct GNUNET_SETUP_OptionSpecification option_specifications[];
+
+#endif