Adding upstream version 43.2.upstream/43.2upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

23 files changed, 3466 insertions, 0 deletions

diff --git a/libnautilus-extension/LICENSE b/libnautilus-extension/LICENSE
new file mode 100644
index 0000000..e9ab0b3
--- /dev/null
+++ b/libnautilus-extension/LICENSE
@@ -0,0 +1,458 @@
+                  GNU LESSER GENERAL PUBLIC LICENSE
+                       Version 2.1, February 1999
+
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diff --git a/libnautilus-extension/meson.build b/libnautilus-extension/meson.build
new file mode 100644
index 0000000..3c2ab4b
--- /dev/null
+++ b/libnautilus-extension/meson.build
@@ -0,0 +1,115 @@
+libnautilus_extension_headers = [
+  'nautilus-column-provider.h',
+  'nautilus-column.h',
+  'nautilus-file-info.h',
+  'nautilus-info-provider.h',
+  'nautilus-menu-provider.h',
+  'nautilus-properties-model-provider.h',
+  'nautilus-properties-model.h',
+  'nautilus-properties-item.h',
+  'nautilus-menu.h'
+]
+
+install_headers(
+  'nautilus-extension.h',
+  subdir: 'nautilus'
+)
+install_headers(
+  libnautilus_extension_headers,
+  subdir: join_paths('nautilus', 'libnautilus-extension')
+)
+
+libnautilus_extension_enums = gnome.mkenums_simple(
+  'nautilus-extension-enum-types',
+  install_header: true,
+  install_dir: join_paths(includedir, 'nautilus', 'libnautilus-extension'),
+  sources: [
+    'nautilus-info-provider.h'
+  ]
+)
+
+libnautilus_extension_sources = [
+  libnautilus_extension_enums,
+  libnautilus_extension_headers,
+  'nautilus-column-provider.c',
+  'nautilus-column.c',
+  'nautilus-extension.h',
+  'nautilus-extension-private.h',
+  'nautilus-file-info.c',
+  'nautilus-info-provider.c',
+  'nautilus-menu-item.c',
+  'nautilus-menu-provider.c',
+  'nautilus-properties-model-provider.c',
+  'nautilus-properties-model.c',
+  'nautilus-properties-item.c',
+  'nautilus-menu.c'
+]
+
+libnautilus_extension_deps = [
+  config_h,
+  glib,
+  gio
+]
+
+libnautilus_extension = shared_library(
+  'nautilus-extension', [
+    libnautilus_extension_sources,
+  ],
+  c_args: [
+    '-DNAUTILUS_COMPILATION'
+  ],
+  dependencies: libnautilus_extension_deps,
+  include_directories: nautilus_include_dirs,
+  soversion: nautilus_extension_version,
+  install: true
+)
+
+if get_option('introspection')
+  nautilus_extension_gir = gnome.generate_gir(
+    libnautilus_extension,
+    export_packages: [
+      'libnautilus-extension'
+    ],
+    extra_args: [
+      '-DNAUTILUS_COMPILATION'
+    ],
+    sources: libnautilus_extension_sources,
+    nsversion: nautilus_extension_version + '.0',
+    namespace: 'Nautilus',
+    includes: [
+      'Gio-2.0',
+      'GLib-2.0'
+    ],
+    header: 'nautilus-extension.h',
+    install: true
+  )
+endif
+
+nautilus_extension = declare_dependency(
+  sources: libnautilus_extension_enums[1],
+  link_with: libnautilus_extension,
+  dependencies: libnautilus_extension_deps,
+  include_directories: nautilus_include_dirs
+)
+
+pkgconfig.generate(
+  description: 'A library to create Nautilus view extensions',
+  filebase: 'libnautilus-extension-' + nautilus_extension_version,
+  libraries: [
+    libnautilus_extension
+  ],
+  name: 'libnautilus-extension',
+  subdirs: [
+    'nautilus'
+  ],
+  requires: [
+    'gio-2.0',
+    'glib-2.0',
+  ],
+  variables: [
+    'exec_prefix=${prefix}',
+    'extensiondir=${libdir}/nautilus/extensions-' + nautilus_extension_version,
+    'extensions_api_version=' + nautilus_extension_version
+  ],
+  version: meson.project_version()
+)
diff --git a/libnautilus-extension/nautilus-column-provider.c b/libnautilus-extension/nautilus-column-provider.c
new file mode 100644
index 0000000..a66ef85
--- /dev/null
+++ b/libnautilus-extension/nautilus-column-provider.c
@@ -0,0 +1,45 @@
+/*
+ *  nautilus-column-provider.c - Interface for Nautilus extensions
+ *                               that provide column specifications.
+ *
+ *  Copyright (C) 2003 Novell, Inc.
+ *
+ *  This library is free software; you can redistribute it and/or
+ *  modify it under the terms of the GNU Library General Public
+ *  License as published by the Free Software Foundation; either
+ *  version 2 of the License, or (at your option) any later version.
+ *
+ *  This library 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
+ *  Library General Public License for more details.
+ *
+ *  You should have received a copy of the GNU Library General Public
+ *  License along with this library; if not, see <http://www.gnu.org/licenses/>.
+ *
+ *  Author:  Dave Camp <dave@ximian.com>
+ *
+ */
+
+#include "nautilus-column-provider.h"
+
+G_DEFINE_INTERFACE (NautilusColumnProvider, nautilus_column_provider, G_TYPE_OBJECT)
+
+static void
+nautilus_column_provider_default_init (NautilusColumnProviderInterface *klass)
+{
+}
+
+GList *
+nautilus_column_provider_get_columns (NautilusColumnProvider *self)
+{
+    NautilusColumnProviderInterface *iface;
+
+    g_return_val_if_fail (NAUTILUS_IS_COLUMN_PROVIDER (self), NULL);
+
+    iface = NAUTILUS_COLUMN_PROVIDER_GET_IFACE (self);
+
+    g_return_val_if_fail (iface->get_columns != NULL, NULL);
+
+    return iface->get_columns (self);
+}
diff --git a/libnautilus-extension/nautilus-column-provider.h b/libnautilus-extension/nautilus-column-provider.h
new file mode 100644
index 0000000..ab54ac5
--- /dev/null
+++ b/libnautilus-extension/nautilus-column-provider.h
@@ -0,0 +1,78 @@
+/*
+ *  nautilus-column-provider.h - Interface for Nautilus extensions that 
+ *                               provide column descriptions.
+ *
+ *  Copyright (C) 2003 Novell, Inc.
+ *
+ *  This library is free software; you can redistribute it and/or
+ *  modify it under the terms of the GNU Library General Public
+ *  License as published by the Free Software Foundation; either
+ *  version 2 of the License, or (at your option) any later version.
+ *
+ *  This library 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
+ *  Library General Public License for more details.
+ *
+ *  You should have received a copy of the GNU Library General Public
+ *  License along with this library; if not, see <http://www.gnu.org/licenses/>.
+ * 
+ *  Author:  Dave Camp <dave@ximian.com>
+ *
+ */
+
+/* This interface is implemented by Nautilus extensions that want to
+ * add columns to the list view and details to the icon view.
+ * Extensions are asked for a list of columns to display.  Each
+ * returned column refers to a string attribute which can be filled in
+ * by NautilusInfoProvider */
+
+#pragma once
+
+#if !defined (NAUTILUS_EXTENSION_H) && !defined (NAUTILUS_COMPILATION)
+#warning "Only <nautilus-extension.h> should be included directly."
+#endif
+
+#include <glib-object.h>
+
+G_BEGIN_DECLS
+
+#define NAUTILUS_TYPE_COLUMN_PROVIDER (nautilus_column_provider_get_type ())
+
+G_DECLARE_INTERFACE (NautilusColumnProvider, nautilus_column_provider,
+                     NAUTILUS, COLUMN_PROVIDER,
+                     GObject)
+
+/**
+ * SECTION:nautilus-column-provider
+ * @title: NautilusColumnProvider
+ * @short_description: Interface to provide additional list view columns
+ *
+ * #NautilusColumnProvider allows extension to provide additional columns
+ * in the file manager list view.
+ */
+
+/**
+ * NautilusColumnProviderInterface:
+ * @g_iface: The parent interface.
+ * @get_columns: Returns a #GList of #NautilusColumn.
+ *               See nautilus_column_provider_get_columns() for details.
+ *
+ * Interface for extensions to provide additional list view columns.
+ */
+struct _NautilusColumnProviderInterface
+{
+    GTypeInterface g_iface;
+
+    GList *(*get_columns) (NautilusColumnProvider *provider);
+};
+
+/**
+ * nautilus_column_provider_get_columns:
+ * @provider: a #NautilusColumnProvider
+ *
+ * Returns: (nullable) (element-type NautilusColumn) (transfer full): the provided #NautilusColumn objects
+ */
+GList *nautilus_column_provider_get_columns (NautilusColumnProvider *provider);
+
+G_END_DECLS
diff --git a/libnautilus-extension/nautilus-column.c b/libnautilus-extension/nautilus-column.c
new file mode 100644
index 0000000..0349863
--- /dev/null
+++ b/libnautilus-extension/nautilus-column.c
@@ -0,0 +1,325 @@
+/*
+ *  nautilus-column.c - Info columns exported by NautilusColumnProvider
+ *                      objects.
+ *
+ *  Copyright (C) 2003 Novell, Inc.
+ *
+ *  This library is free software; you can redistribute it and/or
+ *  modify it under the terms of the GNU Library General Public
+ *  License as published by the Free Software Foundation; either
+ *  version 2 of the License, or (at your option) any later version.
+ *
+ *  This library 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
+ *  Library General Public License for more details.
+ *
+ *  You should have received a copy of the GNU Library General Public
+ *  License along with this library; if not, see <http://www.gnu.org/licenses/>.
+ *
+ *  Author:  Dave Camp <dave@ximian.com>
+ *
+ */
+
+#include "nautilus-column.h"
+
+enum
+{
+    PROP_0,
+    PROP_NAME,
+    PROP_ATTRIBUTE,
+    PROP_ATTRIBUTE_Q,
+    PROP_LABEL,
+    PROP_DESCRIPTION,
+    PROP_XALIGN,
+    PROP_DEFAULT_SORT_ORDER,
+    LAST_PROP
+};
+
+struct _NautilusColumn
+{
+    GObject parent_instance;
+
+    char *name;
+    GQuark attribute;
+    char *label;
+    char *description;
+    float xalign;
+    int default_sort_order; /* Actually, meant to store GtkSortType */
+};
+
+G_DEFINE_TYPE (NautilusColumn, nautilus_column, G_TYPE_OBJECT);
+
+NautilusColumn *
+nautilus_column_new (const char *name,
+                     const char *attribute,
+                     const char *label,
+                     const char *description)
+{
+    NautilusColumn *column;
+
+    g_return_val_if_fail (name != NULL, NULL);
+    g_return_val_if_fail (attribute != NULL, NULL);
+    g_return_val_if_fail (label != NULL, NULL);
+    g_return_val_if_fail (description != NULL, NULL);
+
+    column = g_object_new (NAUTILUS_TYPE_COLUMN,
+                           "name", name,
+                           "attribute", attribute,
+                           "label", label,
+                           "description", description,
+                           NULL);
+
+    return column;
+}
+
+static void
+nautilus_column_get_property (GObject    *object,
+                              guint       param_id,
+                              GValue     *value,
+                              GParamSpec *pspec)
+{
+    NautilusColumn *column;
+
+    column = NAUTILUS_COLUMN (object);
+
+    switch (param_id)
+    {
+        case PROP_NAME:
+        {
+            g_value_set_string (value, column->name);
+        }
+        break;
+
+        case PROP_ATTRIBUTE:
+        {
+            g_value_set_string (value, g_quark_to_string (column->attribute));
+        }
+        break;
+
+        case PROP_ATTRIBUTE_Q:
+        {
+            g_value_set_uint (value, column->attribute);
+        }
+        break;
+
+        case PROP_LABEL:
+        {
+            g_value_set_string (value, column->label);
+        }
+        break;
+
+        case PROP_DESCRIPTION:
+        {
+            g_value_set_string (value, column->description);
+        }
+        break;
+
+        case PROP_XALIGN:
+        {
+            g_value_set_float (value, column->xalign);
+        }
+        break;
+
+        case PROP_DEFAULT_SORT_ORDER:
+        {
+            g_value_set_int (value, column->default_sort_order);
+        }
+        break;
+
+        default:
+        {
+            G_OBJECT_WARN_INVALID_PROPERTY_ID (object, param_id, pspec);
+        }
+        break;
+    }
+}
+
+static void
+nautilus_column_set_property (GObject      *object,
+                              guint         param_id,
+                              const GValue *value,
+                              GParamSpec   *pspec)
+{
+    NautilusColumn *column;
+
+    column = NAUTILUS_COLUMN (object);
+
+    switch (param_id)
+    {
+        case PROP_NAME:
+        {
+            g_free (column->name);
+            column->name = g_strdup (g_value_get_string (value));
+            g_object_notify (object, "name");
+        }
+        break;
+
+        case PROP_ATTRIBUTE:
+        {
+            column->attribute = g_quark_from_string (g_value_get_string (value));
+            g_object_notify (object, "attribute");
+            g_object_notify (object, "attribute_q");
+        }
+        break;
+
+        case PROP_LABEL:
+        {
+            g_free (column->label);
+            column->label = g_strdup (g_value_get_string (value));
+            g_object_notify (object, "label");
+        }
+        break;
+
+        case PROP_DESCRIPTION:
+        {
+            g_free (column->description);
+            column->description = g_strdup (g_value_get_string (value));
+            g_object_notify (object, "description");
+        }
+        break;
+
+        case PROP_XALIGN:
+        {
+            column->xalign = g_value_get_float (value);
+            g_object_notify (object, "xalign");
+        }
+        break;
+
+        case PROP_DEFAULT_SORT_ORDER:
+        {
+            column->default_sort_order = g_value_get_int (value);
+            g_object_notify (object, "default-sort-order");
+        }
+        break;
+
+        default:
+        {
+            G_OBJECT_WARN_INVALID_PROPERTY_ID (object, param_id, pspec);
+        }
+        break;
+    }
+}
+
+static void
+nautilus_column_finalize (GObject *object)
+{
+    NautilusColumn *column;
+
+    column = NAUTILUS_COLUMN (object);
+
+    g_free (column->name);
+    g_free (column->label);
+    g_free (column->description);
+
+    G_OBJECT_CLASS (nautilus_column_parent_class)->finalize (object);
+}
+
+static void
+nautilus_column_init (NautilusColumn *column)
+{
+    column->xalign = 0.0;
+}
+
+static void
+nautilus_column_class_init (NautilusColumnClass *class)
+{
+    G_OBJECT_CLASS (class)->finalize = nautilus_column_finalize;
+    G_OBJECT_CLASS (class)->get_property = nautilus_column_get_property;
+    G_OBJECT_CLASS (class)->set_property = nautilus_column_set_property;
+
+    /**
+     * NautilusColumn:name:
+     *
+     * The identifier for the column.
+     */
+    g_object_class_install_property (G_OBJECT_CLASS (class),
+                                     PROP_NAME,
+                                     g_param_spec_string ("name",
+                                                          "Name",
+                                                          "Name of the column",
+                                                          NULL,
+                                                          G_PARAM_CONSTRUCT_ONLY | G_PARAM_WRITABLE | G_PARAM_READABLE));
+
+    /**
+     * NautilusColumn:attribute:
+     *
+     * The file attribute to be displayed in the column.
+     */
+    g_object_class_install_property (G_OBJECT_CLASS (class),
+                                     PROP_ATTRIBUTE,
+                                     g_param_spec_string ("attribute",
+                                                          "Attribute",
+                                                          "The attribute name to display",
+                                                          NULL,
+                                                          G_PARAM_READWRITE));
+
+    /**
+     * NautilusColumn:attribute_q:
+     *
+     * The name of the attribute to display, in quark form.
+     */
+    g_object_class_install_property (G_OBJECT_CLASS (class),
+                                     PROP_ATTRIBUTE_Q,
+                                     g_param_spec_uint ("attribute_q",
+                                                        "Attribute quark",
+                                                        "The attribute name to display, in quark form",
+                                                        0, G_MAXUINT, 0,
+                                                        G_PARAM_READABLE));
+
+    /**
+     * NautilusColumn:label:
+     *
+     * The label to display in the column.
+     */
+    g_object_class_install_property (G_OBJECT_CLASS (class),
+                                     PROP_LABEL,
+                                     g_param_spec_string ("label",
+                                                          "Label",
+                                                          "Label to display in the column",
+                                                          NULL,
+                                                          G_PARAM_READWRITE));
+
+    /**
+     * NautilusColumn:description:
+     *
+     * The user-visible description of the column.
+     */
+    g_object_class_install_property (G_OBJECT_CLASS (class),
+                                     PROP_DESCRIPTION,
+                                     g_param_spec_string ("description",
+                                                          "Description",
+                                                          "A user-visible description of the column",
+                                                          NULL,
+                                                          G_PARAM_READWRITE));
+
+    /**
+     * NautilusColumn:xalign:
+     *
+     * The x-alignment of the column.
+     */
+    g_object_class_install_property (G_OBJECT_CLASS (class),
+                                     PROP_XALIGN,
+                                     g_param_spec_float ("xalign",
+                                                         "xalign",
+                                                         "The x-alignment of the column",
+                                                         0.0,
+                                                         1.0,
+                                                         0.0,
+                                                         G_PARAM_READWRITE));
+    /**
+     * NautilusColumn:default-sort-order: (type gboolean)
+     *
+     * Actually meant to store the enum values of GtkSortType, but we don't want
+     * extensions to depend on GTK. Also, this is for internal consumption only.
+     *
+     * Stability: Private: Internal to the application.
+     */
+    g_object_class_install_property (G_OBJECT_CLASS (class),
+                                     PROP_DEFAULT_SORT_ORDER,
+                                     g_param_spec_int ("default-sort-order",
+                                                       "Default sort order",
+                                                       "Default sort order",
+                                                       G_MININT, G_MAXINT, 0,
+                                                       G_PARAM_READWRITE));
+}
diff --git a/libnautilus-extension/nautilus-column.h b/libnautilus-extension/nautilus-column.h
new file mode 100644
index 0000000..09dc0c7
--- /dev/null
+++ b/libnautilus-extension/nautilus-column.h
@@ -0,0 +1,67 @@
+/*
+ *  nautilus-column.h - Info columns exported by 
+ *                      NautilusColumnProvider objects.
+ *
+ *  Copyright (C) 2003 Novell, Inc.
+ *
+ *  This library is free software; you can redistribute it and/or
+ *  modify it under the terms of the GNU Library General Public
+ *  License as published by the Free Software Foundation; either
+ *  version 2 of the License, or (at your option) any later version.
+ *
+ *  This library 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
+ *  Library General Public License for more details.
+ *
+ *  You should have received a copy of the GNU Library General Public
+ *  License along with this library; if not, see <http://www.gnu.org/licenses/>.
+ * 
+ *  Author:  Dave Camp <dave@ximian.com>
+ *
+ */
+
+#pragma once
+
+#if !defined (NAUTILUS_EXTENSION_H) && !defined (NAUTILUS_COMPILATION)
+#warning "Only <nautilus-extension.h> should be included directly."
+#endif
+
+#include <glib-object.h>
+
+G_BEGIN_DECLS
+
+#define NAUTILUS_TYPE_COLUMN (nautilus_column_get_type())
+
+G_DECLARE_FINAL_TYPE (NautilusColumn, nautilus_column, NAUTILUS, COLUMN, GObject)
+
+/**
+ * NautilusColumn:
+ *
+ * List view column descriptor object.
+ *
+ * `NautilusColumn` is an object that describes a column in the file manager
+ * list view. Extensions can provide `NautilusColumn` by registering a
+ * [class@ColumnProvider] and returning them from
+ * [method@ColumnProvider.get_columns], which will be called by the main
+ * application when creating a view.
+ */
+
+/**
+ * nautilus_column_new:
+ *
+ * @name: (not nullable): identifier of the column
+ * @attribute: (not nullable): the file attribute to be displayed in the column
+ * @label: (not nullable): the user-visible label for the column
+ * @description: (not nullable): a user-visible description of the column
+ *
+ * Creates a new [class@Column] object.
+ *
+ * Returns: (transfer full): a new #NautilusColumn
+ */
+NautilusColumn *nautilus_column_new  (const char *name,
+                                      const char *attribute,
+                                      const char *label,
+                                      const char *description);
+
+G_END_DECLS
diff --git a/libnautilus-extension/nautilus-extension-private.h b/libnautilus-extension/nautilus-extension-private.h
new file mode 100644
index 0000000..775e892
--- /dev/null
+++ b/libnautilus-extension/nautilus-extension-private.h
@@ -0,0 +1,31 @@
+/*
+ *  nautilus-extension-private.h - Type definitions for Nautilus extensions
+ * 
+ *  Copyright (C) 2009 Red Hat, Inc.
+ *
+ *  This library is free software; you can redistribute it and/or
+ *  modify it under the terms of the GNU Library General Public
+ *  License as published by the Free Software Foundation; either
+ *  version 2 of the License, or (at your option) any later version.
+ *
+ *  This library 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
+ *  Library General Public License for more details.
+ *
+ *  You should have received a copy of the GNU Library General Public
+ *  License along with this library; if not, see <http://www.gnu.org/licenses/>.
+ *
+ *  Author: Alexander Larsson <alexl@redhat.com>
+ * 
+ */
+
+#pragma once
+
+#include <libnautilus-extension/nautilus-file-info.h>
+
+G_BEGIN_DECLS
+
+extern NautilusFileInfo *(*nautilus_file_info_getter) (GFile *location, gboolean create);
+
+G_END_DECLS
\ No newline at end of file
diff --git a/libnautilus-extension/nautilus-extension.h b/libnautilus-extension/nautilus-extension.h
new file mode 100644
index 0000000..e7dc3c8
--- /dev/null
+++ b/libnautilus-extension/nautilus-extension.h
@@ -0,0 +1,62 @@
+/* Copyright (C) 2018 Ernestas Kulik <ernestask@gnome.org>
+ *
+ * This file is part of libnautilus-extension.
+ *
+ * libnautilus-extension is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation, either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * libnautilus-extension 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 Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with libnautilus-extension.  If not, see <https://www.gnu.org/licenses/>.
+ */
+#ifndef NAUTILUS_EXTENSION_H
+#define NAUTILUS_EXTENSION_H
+
+#include <libnautilus-extension/nautilus-column-provider.h>
+#include <libnautilus-extension/nautilus-column.h>
+#include <libnautilus-extension/nautilus-extension-enum-types.h>
+#include <libnautilus-extension/nautilus-file-info.h>
+#include <libnautilus-extension/nautilus-info-provider.h>
+#include <libnautilus-extension/nautilus-menu.h>
+#include <libnautilus-extension/nautilus-menu-provider.h>
+#include <libnautilus-extension/nautilus-properties-model.h>
+#include <libnautilus-extension/nautilus-properties-model-provider.h>
+#include <libnautilus-extension/nautilus-properties-item.h>
+
+/**
+ * SECTION:nautilus-extension
+ * @title: Extension entry points
+ */
+
+/**
+ * nautilus_module_initialize: (skip)
+ * @module: a #GTypeModule used in type registration
+ *
+ * Called when the extension is begin loaded to register the types it exports
+ * and to perform other initializations.
+ */
+void nautilus_module_initialize (GTypeModule  *module);
+/**
+ * nautilus_module_shutdown: (skip)
+ *
+ * Called when the extension is being unloaded.
+ */
+void nautilus_module_shutdown   (void);
+/**
+ * nautilus_module_list_types: (skip)
+ * @types: (out) (transfer none) (array length=num_types): array of GType *
+ * @num_types: the number of types in the array
+ *
+ * Called after the extension has been initialized and has registered all the
+ * types it exports, to load them into Nautilus.
+ */
+void nautilus_module_list_types (const GType **types,
+                                 int          *num_types);
+
+#endif
diff --git a/libnautilus-extension/nautilus-file-info.c b/libnautilus-extension/nautilus-file-info.c
new file mode 100644
index 0000000..020cac3
--- /dev/null
+++ b/libnautilus-extension/nautilus-file-info.c
@@ -0,0 +1,375 @@
+/*
+ *  nautilus-file-info.c - Information about a file
+ *
+ *  Copyright (C) 2003 Novell, Inc.
+ *
+ *  This library is free software; you can redistribute it and/or
+ *  modify it under the terms of the GNU Library General Public
+ *  License as published by the Free Software Foundation; either
+ *  version 2 of the License, or (at your option) any later version.
+ *
+ *  This library 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
+ *  Library General Public License for more details.
+ *
+ *  You should have received a copy of the GNU Library General Public
+ *  License along with this library; if not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+#include "nautilus-file-info.h"
+
+#include "nautilus-extension-private.h"
+
+G_DEFINE_INTERFACE (NautilusFileInfo, nautilus_file_info, G_TYPE_OBJECT)
+
+NautilusFileInfo * (*nautilus_file_info_getter)(GFile   *location,
+                                                gboolean create);
+
+GList *
+nautilus_file_info_list_copy (GList *files)
+{
+    GList *ret;
+    GList *l;
+
+    ret = g_list_copy (files);
+    for (l = ret; l != NULL; l = l->next)
+    {
+        g_object_ref (G_OBJECT (l->data));
+    }
+
+    return ret;
+}
+
+void
+nautilus_file_info_list_free (GList *files)
+{
+    GList *l;
+
+    for (l = files; l != NULL; l = l->next)
+    {
+        g_object_unref (G_OBJECT (l->data));
+    }
+
+    g_list_free (files);
+}
+
+static void
+nautilus_file_info_default_init (NautilusFileInfoInterface *klass)
+{
+}
+
+gboolean
+nautilus_file_info_is_gone (NautilusFileInfo *self)
+{
+    NautilusFileInfoInterface *iface;
+
+    g_return_val_if_fail (NAUTILUS_IS_FILE_INFO (self), FALSE);
+
+    iface = NAUTILUS_FILE_INFO_GET_IFACE (self);
+
+    g_return_val_if_fail (iface->is_gone != NULL, FALSE);
+
+    return iface->is_gone (self);
+}
+
+GFileType
+nautilus_file_info_get_file_type (NautilusFileInfo *self)
+{
+    NautilusFileInfoInterface *iface;
+
+    g_return_val_if_fail (NAUTILUS_IS_FILE_INFO (self), G_FILE_TYPE_UNKNOWN);
+
+    iface = NAUTILUS_FILE_INFO_GET_IFACE (self);
+
+    g_return_val_if_fail (iface->get_file_type != NULL, G_FILE_TYPE_UNKNOWN);
+
+    return iface->get_file_type (self);
+}
+
+char *
+nautilus_file_info_get_name (NautilusFileInfo *self)
+{
+    NautilusFileInfoInterface *iface;
+
+    g_return_val_if_fail (NAUTILUS_IS_FILE_INFO (self), NULL);
+
+    iface = NAUTILUS_FILE_INFO_GET_IFACE (self);
+
+    g_return_val_if_fail (iface->get_name != NULL, NULL);
+
+    return iface->get_name (self);
+}
+
+GFile *
+nautilus_file_info_get_location (NautilusFileInfo *self)
+{
+    NautilusFileInfoInterface *iface;
+
+    g_return_val_if_fail (NAUTILUS_IS_FILE_INFO (self), NULL);
+
+    iface = NAUTILUS_FILE_INFO_GET_IFACE (self);
+
+    g_return_val_if_fail (iface->get_location != NULL, NULL);
+
+    return iface->get_location (self);
+}
+char *
+nautilus_file_info_get_uri (NautilusFileInfo *self)
+{
+    NautilusFileInfoInterface *iface;
+
+    g_return_val_if_fail (NAUTILUS_IS_FILE_INFO (self), NULL);
+
+    iface = NAUTILUS_FILE_INFO_GET_IFACE (self);
+
+    g_return_val_if_fail (iface->get_uri != NULL, NULL);
+
+    return iface->get_uri (self);
+}
+
+char *
+nautilus_file_info_get_activation_uri (NautilusFileInfo *self)
+{
+    NautilusFileInfoInterface *iface;
+
+    g_return_val_if_fail (NAUTILUS_IS_FILE_INFO (self), NULL);
+
+    iface = NAUTILUS_FILE_INFO_GET_IFACE (self);
+
+    g_return_val_if_fail (iface->get_activation_uri != NULL, NULL);
+
+    return iface->get_activation_uri (self);
+}
+
+GFile *
+nautilus_file_info_get_parent_location (NautilusFileInfo *self)
+{
+    NautilusFileInfoInterface *iface;
+
+    g_return_val_if_fail (NAUTILUS_IS_FILE_INFO (self), NULL);
+
+    iface = NAUTILUS_FILE_INFO_GET_IFACE (self);
+
+    g_return_val_if_fail (iface->get_parent_location != NULL, NULL);
+
+    return iface->get_parent_location (self);
+}
+
+char *
+nautilus_file_info_get_parent_uri (NautilusFileInfo *self)
+{
+    NautilusFileInfoInterface *iface;
+
+    g_return_val_if_fail (NAUTILUS_IS_FILE_INFO (self), NULL);
+
+    iface = NAUTILUS_FILE_INFO_GET_IFACE (self);
+
+    g_return_val_if_fail (iface->get_parent_uri != NULL, NULL);
+
+    return iface->get_parent_uri (self);
+}
+
+NautilusFileInfo *
+nautilus_file_info_get_parent_info (NautilusFileInfo *self)
+{
+    NautilusFileInfoInterface *iface;
+
+    g_return_val_if_fail (NAUTILUS_IS_FILE_INFO (self), NULL);
+
+    iface = NAUTILUS_FILE_INFO_GET_IFACE (self);
+
+    g_return_val_if_fail (iface->get_parent_info != NULL, NULL);
+
+    return iface->get_parent_info (self);
+}
+
+GMount *
+nautilus_file_info_get_mount (NautilusFileInfo *self)
+{
+    NautilusFileInfoInterface *iface;
+
+    g_return_val_if_fail (NAUTILUS_IS_FILE_INFO (self), NULL);
+
+    iface = NAUTILUS_FILE_INFO_GET_IFACE (self);
+
+    g_return_val_if_fail (iface->get_mount != NULL, NULL);
+
+    return iface->get_mount (self);
+}
+
+char *
+nautilus_file_info_get_uri_scheme (NautilusFileInfo *self)
+{
+    NautilusFileInfoInterface *iface;
+
+    g_return_val_if_fail (NAUTILUS_IS_FILE_INFO (self), NULL);
+
+    iface = NAUTILUS_FILE_INFO_GET_IFACE (self);
+
+    g_return_val_if_fail (iface->get_uri_scheme != NULL, NULL);
+
+    return iface->get_uri_scheme (self);
+}
+
+char *
+nautilus_file_info_get_mime_type (NautilusFileInfo *self)
+{
+    NautilusFileInfoInterface *iface;
+
+    g_return_val_if_fail (NAUTILUS_IS_FILE_INFO (self), NULL);
+
+    iface = NAUTILUS_FILE_INFO_GET_IFACE (self);
+
+    g_return_val_if_fail (iface->get_mime_type != NULL, NULL);
+
+    return iface->get_mime_type (self);
+}
+
+gboolean
+nautilus_file_info_is_mime_type (NautilusFileInfo *self,
+                                 const char       *mime_type)
+{
+    NautilusFileInfoInterface *iface;
+
+    g_return_val_if_fail (NAUTILUS_IS_FILE_INFO (self), FALSE);
+    g_return_val_if_fail (mime_type != NULL, FALSE);
+
+    iface = NAUTILUS_FILE_INFO_GET_IFACE (self);
+
+    g_return_val_if_fail (iface->is_mime_type != NULL, FALSE);
+
+    return iface->is_mime_type (self, mime_type);
+}
+
+gboolean
+nautilus_file_info_is_directory (NautilusFileInfo *self)
+{
+    NautilusFileInfoInterface *iface;
+
+    g_return_val_if_fail (NAUTILUS_IS_FILE_INFO (self), FALSE);
+
+    iface = NAUTILUS_FILE_INFO_GET_IFACE (self);
+
+    g_return_val_if_fail (iface->is_directory != NULL, FALSE);
+
+    return iface->is_directory (self);
+}
+
+gboolean
+nautilus_file_info_can_write (NautilusFileInfo *self)
+{
+    NautilusFileInfoInterface *iface;
+
+    g_return_val_if_fail (NAUTILUS_IS_FILE_INFO (self), FALSE);
+
+    iface = NAUTILUS_FILE_INFO_GET_IFACE (self);
+
+    g_return_val_if_fail (iface->can_write != NULL, FALSE);
+
+    return iface->can_write (self);
+}
+
+void
+nautilus_file_info_add_emblem (NautilusFileInfo *self,
+                               const char       *emblem_name)
+{
+    NautilusFileInfoInterface *iface;
+
+    g_return_if_fail (NAUTILUS_IS_FILE_INFO (self));
+
+    iface = NAUTILUS_FILE_INFO_GET_IFACE (self);
+
+    g_return_if_fail (iface->add_emblem != NULL);
+
+    iface->add_emblem (self, emblem_name);
+}
+
+char *
+nautilus_file_info_get_string_attribute (NautilusFileInfo *self,
+                                         const char       *attribute_name)
+{
+    NautilusFileInfoInterface *iface;
+
+    g_return_val_if_fail (NAUTILUS_IS_FILE_INFO (self), NULL);
+    g_return_val_if_fail (attribute_name != NULL, NULL);
+
+    iface = NAUTILUS_FILE_INFO_GET_IFACE (self);
+
+    g_return_val_if_fail (iface->get_string_attribute != NULL, NULL);
+
+    return iface->get_string_attribute (self, attribute_name);
+}
+
+void
+nautilus_file_info_add_string_attribute (NautilusFileInfo *self,
+                                         const char       *attribute_name,
+                                         const char       *value)
+{
+    NautilusFileInfoInterface *iface;
+
+    g_return_if_fail (NAUTILUS_IS_FILE_INFO (self));
+    g_return_if_fail (attribute_name != NULL);
+    g_return_if_fail (value != NULL);
+
+    iface = NAUTILUS_FILE_INFO_GET_IFACE (self);
+
+    g_return_if_fail (iface->add_string_attribute != NULL);
+
+    iface->add_string_attribute (self, attribute_name, value);
+}
+
+void
+nautilus_file_info_invalidate_extension_info (NautilusFileInfo *self)
+{
+    NautilusFileInfoInterface *iface;
+
+    g_return_if_fail (NAUTILUS_IS_FILE_INFO (self));
+
+    iface = NAUTILUS_FILE_INFO_GET_IFACE (self);
+
+    g_return_if_fail (iface->invalidate_extension_info != NULL);
+
+    iface->invalidate_extension_info (self);
+}
+
+NautilusFileInfo *
+nautilus_file_info_lookup (GFile *location)
+{
+    g_return_val_if_fail (G_IS_FILE (location), NULL);
+
+    return nautilus_file_info_getter (location, FALSE);
+}
+
+NautilusFileInfo *
+nautilus_file_info_create (GFile *location)
+{
+    g_return_val_if_fail (G_IS_FILE (location), NULL);
+
+    return nautilus_file_info_getter (location, TRUE);
+}
+
+NautilusFileInfo *
+nautilus_file_info_lookup_for_uri (const char *uri)
+{
+    g_autoptr (GFile) location = NULL;
+
+    g_return_val_if_fail (uri != NULL, NULL);
+
+    location = g_file_new_for_uri (uri);
+
+    return nautilus_file_info_lookup (location);
+}
+
+NautilusFileInfo *
+nautilus_file_info_create_for_uri (const char *uri)
+{
+    g_autoptr (GFile) location = NULL;
+
+    g_return_val_if_fail (uri != NULL, NULL);
+
+    location = g_file_new_for_uri (uri);
+
+    return nautilus_file_info_create (location);
+}
diff --git a/libnautilus-extension/nautilus-file-info.h b/libnautilus-extension/nautilus-file-info.h
new file mode 100644
index 0000000..1fe71b5
--- /dev/null
+++ b/libnautilus-extension/nautilus-file-info.h
@@ -0,0 +1,328 @@
+/*
+ *  nautilus-file-info.h - Information about a file 
+ *
+ *  Copyright (C) 2003 Novell, Inc.
+ *
+ *  This library is free software; you can redistribute it and/or
+ *  modify it under the terms of the GNU Library General Public
+ *  License as published by the Free Software Foundation; either
+ *  version 2 of the License, or (at your option) any later version.
+ *
+ *  This library 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
+ *  Library General Public License for more details.
+ *
+ *  You should have received a copy of the GNU Library General Public
+ *  License along with this library; if not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+/* NautilusFileInfo is an interface to the NautilusFile object.  It 
+ * provides access to the asynchronous data in the NautilusFile.
+ * Extensions are passed objects of this type for operations. */
+
+#pragma once
+
+#if !defined (NAUTILUS_EXTENSION_H) && !defined (NAUTILUS_COMPILATION)
+#warning "Only <nautilus-extension.h> should be included directly."
+#endif
+
+#include <glib-object.h>
+#include <gio/gio.h>
+
+G_BEGIN_DECLS
+
+#define NAUTILUS_TYPE_FILE_INFO (nautilus_file_info_get_type ())
+
+G_DECLARE_INTERFACE (NautilusFileInfo, nautilus_file_info, NAUTILUS, FILE_INFO, GObject)
+
+/**
+ * SECTION:nautilus-file-info
+ * @title: NautilusFileInfo
+ * @short_description: File interface for nautilus extensions
+ *
+ * #NautilusFileInfo provides methods to get and modify information
+ * about file objects in the file manager.
+ */
+
+/**
+ * NautilusFileInfoInterface:
+ * @g_iface: The parent interface.
+ * @is_gone: Returns whether the file info is gone.
+ *           See nautilus_file_info_is_gone() for details.
+ * @get_name: Returns the file name as a string.
+ *            See nautilus_file_info_get_name() for details.
+ * @get_uri: Returns the file URI as a string.
+ *           See nautilus_file_info_get_uri() for details.
+ * @get_parent_uri: Returns the file parent URI as a string.
+ *                  See nautilus_file_info_get_parent_uri() for details.
+ * @get_uri_scheme: Returns the file URI scheme as a string.
+ *                  See nautilus_file_info_get_uri_scheme() for details.
+ * @get_mime_type: Returns the file mime type as a string.
+ *                 See nautilus_file_info_get_mime_type() for details.
+ * @is_mime_type: Returns whether the file is the given mime type.
+ *                See nautilus_file_info_is_mime_type() for details.
+ * @is_directory: Returns whether the file is a directory.
+ *                See nautilus_file_info_is_directory() for details.
+ * @add_emblem: Adds an emblem to this file.
+ *              See nautilus_file_info_add_emblem() for details.
+ * @get_string_attribute: Returns the specified file attribute as a string.
+ *                        See nautilus_file_info_get_string_attribute() for details.
+ * @add_string_attribute: Sets the specified string file attribute value.
+ *                        See nautilus_file_info_add_string_attribute() for details.
+ * @invalidate_extension_info: Invalidates information of the file provided by extensions.
+ *                             See nautilus_file_info_invalidate_extension_info() for details.
+ * @get_activation_uri: Returns the file activation URI as a string.
+ *                      See nautilus_file_info_get_activation_uri() for details.
+ * @get_file_type: Returns the file type.
+ *                 See nautilus_file_info_get_file_type() for details.
+ * @get_location: Returns the file location as a #GFile.
+ *                See nautilus_file_info_get_location() for details.
+ * @get_parent_location: Returns the file parent location as a #GFile.
+ *                       See nautilus_file_info_get_parent_location() for details.
+ * @get_parent_info: Returns the file parent #NautilusFileInfo.
+ *                   See nautilus_file_info_get_parent_info() for details.
+ * @get_mount: Returns the file mount as a #GMount.
+ *             See nautilus_file_info_get_mount() for details.
+ * @can_write: Returns whether the file is writable.
+ *             See nautilus_file_info_can_write() for details.
+ *
+ * Interface for extensions to provide additional menu items.
+ */
+struct _NautilusFileInfoInterface
+{
+    GTypeInterface g_iface;
+
+    gboolean          (*is_gone)                   (NautilusFileInfo *file_info);
+
+    char             *(*get_name)                  (NautilusFileInfo *file_info);
+    char             *(*get_uri)                   (NautilusFileInfo *file_info);
+    char             *(*get_parent_uri)            (NautilusFileInfo *file_info);
+    char             *(*get_uri_scheme)            (NautilusFileInfo *file_info);
+
+    char             *(*get_mime_type)             (NautilusFileInfo *file_info);
+    gboolean          (*is_mime_type)              (NautilusFileInfo *file_info,
+                                                    const char       *mime_type);
+    gboolean          (*is_directory)              (NautilusFileInfo *file_info);
+
+    void              (*add_emblem)                (NautilusFileInfo *file_info,
+                                                    const char       *emblem_name);
+    char             *(*get_string_attribute)      (NautilusFileInfo *file_info,
+                                                    const char       *attribute_name);
+    void              (*add_string_attribute)      (NautilusFileInfo *file_info,
+                                                    const char       *attribute_name,
+                                                    const char       *value);
+    void              (*invalidate_extension_info) (NautilusFileInfo *file_info);
+
+    char             *(*get_activation_uri)        (NautilusFileInfo *file_info);
+
+    GFileType         (*get_file_type)             (NautilusFileInfo *file_info);
+    GFile            *(*get_location)              (NautilusFileInfo *file_info);
+    GFile            *(*get_parent_location)       (NautilusFileInfo *file_info);
+    NautilusFileInfo *(*get_parent_info)           (NautilusFileInfo *file_info);
+    GMount           *(*get_mount)                 (NautilusFileInfo *file_info);
+    gboolean          (*can_write)                 (NautilusFileInfo *file_info);
+};
+
+/**
+ * nautilus_file_info_list_copy:
+ * @files: (element-type NautilusFileInfo): the files to copy
+ *
+ * Returns: (element-type NautilusFileInfo) (transfer full): a copy of @files.
+ *  Use #nautilus_file_info_list_free to free the list and unref its contents.
+ */
+GList            *nautilus_file_info_list_copy            (GList            *files);
+/**
+ * nautilus_file_info_list_free:
+ * @files: (element-type NautilusFileInfo): a list created with #nautilus_file_info_list_copy
+ *
+ */
+void              nautilus_file_info_list_free            (GList            *files);
+
+/**
+ * nautilus_file_info_is_gone:
+ * @file_info: a #NautilusFileInfo
+ *
+ * Returns: whether the file has been deleted
+ */
+gboolean          nautilus_file_info_is_gone              (NautilusFileInfo *file_info);
+
+/* Name and Location */
+/**
+ * nautilus_file_info_get_file_type:
+ * @file_info: a #NautilusFileInfo
+ *
+ * Returns: a #GFileType for the location of @file_info
+ */
+GFileType         nautilus_file_info_get_file_type        (NautilusFileInfo *file_info);
+/**
+ * nautilus_file_info_get_location:
+ * @file_info: a #NautilusFileInfo
+ *
+ * Returns: (transfer full): a #GFile for the location of @file_info
+ */
+GFile            *nautilus_file_info_get_location         (NautilusFileInfo *file_info);
+/**
+ * nautilus_file_info_get_name:
+ * @file_info: a #NautilusFileInfo
+ *
+ * Returns: the file name of @file_info
+ */
+char             *nautilus_file_info_get_name             (NautilusFileInfo *file_info);
+/**
+ * nautilus_file_info_get_uri:
+ * @file_info: a #NautilusFileInfo
+ *
+ * Returns: the file URI of @file_info
+ */
+char             *nautilus_file_info_get_uri              (NautilusFileInfo *file_info);
+/**
+ * nautilus_file_info_get_activation_uri:
+ * @file_info: a #NautilusFileInfo
+ *
+ * Returns: the activation URI of @file_info, which may differ from the actual
+ *   URI if e.g. the file is a .desktop file or a Nautilus XML link file
+ */
+char             *nautilus_file_info_get_activation_uri   (NautilusFileInfo *file_info);
+/**
+ * nautilus_file_info_get_parent_location:
+ * @file_info: a #NautilusFileInfo
+ *
+ * Returns: (allow-none) (transfer full): a #GFile for the parent location of @file_info,
+ *   or %NULL if @file_info has no parent
+ */
+GFile            *nautilus_file_info_get_parent_location  (NautilusFileInfo *file_info);
+/**
+ * nautilus_file_info_get_parent_uri:
+ * @file_info: a #NautilusFileInfo
+ *
+ * Returns: the URI for the parent location of @file_info, or the empty string
+ *   if it has none
+ */
+char             *nautilus_file_info_get_parent_uri       (NautilusFileInfo *file_info);
+/**
+ * nautilus_file_info_get_mount:
+ * @file_info: a #NautilusFileInfo
+ *
+ * Returns: (nullable) (transfer full): a #GMount for the mount of @file_info,
+ *                                      or %NULL if @file_info has no mount
+ */
+GMount           *nautilus_file_info_get_mount            (NautilusFileInfo *file_info);
+/**
+ * nautilus_file_info_get_uri_scheme:
+ * @file_info: a #NautilusFileInfo
+ *
+ * Returns: the URI scheme of @file_info
+ */
+char             *nautilus_file_info_get_uri_scheme       (NautilusFileInfo *file_info);
+/**
+ * nautilus_file_info_get_parent_info:
+ * @file_info: a #NautilusFileInfo
+ *
+ * It's not safe to call this recursively multiple times, as it works
+ * only for files already cached by Nautilus.
+ *
+ * Returns: (nullable) (transfer full): a #NautilusFileInfo for the parent of @file_info,
+ *                                      or %NULL if @file_info has no parent.
+ */
+NautilusFileInfo *nautilus_file_info_get_parent_info      (NautilusFileInfo *file_info);
+
+/**
+ * nautilus_file_info_get_mime_type:
+ * @file_info: a #NautilusFileInfo
+ *
+ * Returns: (transfer full): the MIME type of @file_info
+ */
+char *            nautilus_file_info_get_mime_type        (NautilusFileInfo *file_info);
+/**
+ * nautilus_file_info_is_mime_type:
+ * @file_info: a #NautilusFileInfo
+ * @mime_type: a MIME type
+ *
+ * Returns: %TRUE when the MIME type of @file_info matches @mime_type, and
+ *   %FALSE otherwise
+ */
+gboolean          nautilus_file_info_is_mime_type         (NautilusFileInfo *file_info,
+                                                           const char       *mime_type);
+/**
+ * nautilus_file_info_is_directory:
+ * @file_info: a #NautilusFileInfo
+ *
+ * Returns: %TRUE when @file_info is a directory, and %FALSE otherwise
+ */
+gboolean          nautilus_file_info_is_directory         (NautilusFileInfo *file_info);
+/**
+ * nautilus_file_info_can_write:
+ * @file_info: a #NautilusFileInfo
+ *
+ * Returns: %TRUE when @file_info is writeable, and %FALSE otherwise
+ */
+gboolean          nautilus_file_info_can_write            (NautilusFileInfo *file_info);
+
+
+/* Modifying the NautilusFileInfo */
+/**
+ * nautilus_file_info_add_emblem:
+ * @file_info: a #NautilusFileInfo
+ * @emblem_name: the name of an emblem
+ */
+void              nautilus_file_info_add_emblem           (NautilusFileInfo *file_info,
+                                                           const char       *emblem_name);
+/**
+ * nautilus_file_info_get_string_attribute:
+ * @file_info: a #NautilusFileInfo
+ * @attribute_name: the name of an attribute
+ *
+ * Returns: (nullable): the value for the given @attribute_name, or %NULL if
+ *   there is none
+ */
+char             *nautilus_file_info_get_string_attribute (NautilusFileInfo *file_info,
+                                                           const char       *attribute_name);
+/**
+ * nautilus_file_info_add_string_attribute:
+ * @file_info: a #NautilusFileInfo
+ * @attribute_name: the name of an attribute
+ * @value: the name of an attribute
+ */
+void              nautilus_file_info_add_string_attribute (NautilusFileInfo *file_info,
+                                                           const char       *attribute_name,
+                                                           const char       *value);
+
+/* Invalidating file info */
+/**
+ * nautilus_file_info_invalidate_extension_info:
+ * @file_info: a #NautilusFileInfo
+ */
+void              nautilus_file_info_invalidate_extension_info (NautilusFileInfo *file_info);
+
+/**
+ * nautilus_file_info_lookup:
+ * @location: the location for which to look up a corresponding #NautilusFileInfo object
+ *
+ * Returns: (nullable) (transfer full): a #NautilusFileInfo
+ */
+NautilusFileInfo *nautilus_file_info_lookup                (GFile *location);
+/**
+ * nautilus_file_info_create:
+ * @location: the location to create the file info for
+ *
+ * Returns: (transfer full): a #NautilusFileInfo
+ */
+NautilusFileInfo *nautilus_file_info_create                (GFile *location);
+/**
+ * nautilus_file_info_lookup_for_uri:
+ * @uri: the URI to lookup the file info for
+ *
+ * Returns: (nullable) (transfer full): a #NautilusFileInfo
+ */
+NautilusFileInfo *nautilus_file_info_lookup_for_uri        (const char *uri);
+/**
+ * nautilus_file_info_create_for_uri:
+ * @uri: the URI to lookup the file info for
+ *
+ * Returns: (transfer full): a #NautilusFileInfo
+ */
+NautilusFileInfo *nautilus_file_info_create_for_uri        (const char *uri);
+
+G_END_DECLS
diff --git a/libnautilus-extension/nautilus-info-provider.c b/libnautilus-extension/nautilus-info-provider.c
new file mode 100644
index 0000000..5fce655
--- /dev/null
+++ b/libnautilus-extension/nautilus-info-provider.c
@@ -0,0 +1,98 @@
+/*
+ *  nautilus-info-provider.c - Interface for Nautilus extensions that
+ *                             provide info about files.
+ *
+ *  Copyright (C) 2003 Novell, Inc.
+ *
+ *  This library is free software; you can redistribute it and/or
+ *  modify it under the terms of the GNU Library General Public
+ *  License as published by the Free Software Foundation; either
+ *  version 2 of the License, or (at your option) any later version.
+ *
+ *  This library 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
+ *  Library General Public License for more details.
+ *
+ *  You should have received a copy of the GNU Library General Public
+ *  License along with this library; if not, see <http://www.gnu.org/licenses/>.
+ *
+ *  Author:  Dave Camp <dave@ximian.com>
+ *
+ */
+
+#include "nautilus-info-provider.h"
+
+#include "nautilus-extension-enum-types.h"
+
+G_DEFINE_INTERFACE (NautilusInfoProvider, nautilus_info_provider, G_TYPE_OBJECT)
+
+static void
+nautilus_info_provider_default_init (NautilusInfoProviderInterface *klass)
+{
+}
+
+NautilusOperationResult
+nautilus_info_provider_update_file_info (NautilusInfoProvider     *self,
+                                         NautilusFileInfo         *file,
+                                         GClosure                 *update_complete,
+                                         NautilusOperationHandle **handle)
+{
+    NautilusInfoProviderInterface *iface;
+
+    g_return_val_if_fail (NAUTILUS_IS_INFO_PROVIDER (self),
+                          NAUTILUS_OPERATION_FAILED);
+    g_return_val_if_fail (update_complete != NULL,
+                          NAUTILUS_OPERATION_FAILED);
+    g_return_val_if_fail (handle != NULL, NAUTILUS_OPERATION_FAILED);
+
+    iface = NAUTILUS_INFO_PROVIDER_GET_IFACE (self);
+
+    g_return_val_if_fail (iface->update_file_info != NULL,
+                          NAUTILUS_OPERATION_FAILED);
+
+    return iface->update_file_info (self, file, update_complete, handle);
+}
+
+void
+nautilus_info_provider_cancel_update (NautilusInfoProvider    *self,
+                                      NautilusOperationHandle *handle)
+{
+    NautilusInfoProviderInterface *iface;
+
+    g_return_if_fail (NAUTILUS_IS_INFO_PROVIDER (self));
+    g_return_if_fail (handle != NULL);
+
+    iface = NAUTILUS_INFO_PROVIDER_GET_IFACE (self);
+
+    g_return_if_fail (iface->cancel_update != NULL);
+
+    iface->cancel_update (self, handle);
+}
+
+void
+nautilus_info_provider_update_complete_invoke (GClosure                *update_complete,
+                                               NautilusInfoProvider    *provider,
+                                               NautilusOperationHandle *handle,
+                                               NautilusOperationResult  result)
+{
+    GValue args[3] = { { 0, } };
+    GValue return_val = { 0, };
+
+    g_return_if_fail (update_complete != NULL);
+    g_return_if_fail (NAUTILUS_IS_INFO_PROVIDER (provider));
+
+    g_value_init (&args[0], NAUTILUS_TYPE_INFO_PROVIDER);
+    g_value_init (&args[1], G_TYPE_POINTER);
+    g_value_init (&args[2], NAUTILUS_TYPE_OPERATION_RESULT);
+
+    g_value_set_object (&args[0], provider);
+    g_value_set_pointer (&args[1], handle);
+    g_value_set_enum (&args[2], result);
+
+    g_closure_invoke (update_complete, &return_val, 3, args, NULL);
+
+    g_value_unset (&args[0]);
+    g_value_unset (&args[1]);
+    g_value_unset (&args[2]);
+}
diff --git a/libnautilus-extension/nautilus-info-provider.h b/libnautilus-extension/nautilus-info-provider.h
new file mode 100644
index 0000000..128a46b
--- /dev/null
+++ b/libnautilus-extension/nautilus-info-provider.h
@@ -0,0 +1,156 @@
+/*
+ *  nautilus-info-provider.h - Interface for Nautilus extensions that 
+ *                             provide info about files.
+ *
+ *  Copyright (C) 2003 Novell, Inc.
+ *
+ *  This library is free software; you can redistribute it and/or
+ *  modify it under the terms of the GNU Library General Public
+ *  License as published by the Free Software Foundation; either
+ *  version 2 of the License, or (at your option) any later version.
+ *
+ *  This library 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
+ *  Library General Public License for more details.
+ *
+ *  You should have received a copy of the GNU Library General Public
+ *  License along with this library; if not, see <http://www.gnu.org/licenses/>.
+ * 
+ *  Author:  Dave Camp <dave@ximian.com>
+ *
+ */
+
+/* This interface is implemented by Nautilus extensions that want to 
+ * provide information about files.  Extensions are called when Nautilus 
+ * needs information about a file.  They are passed a NautilusFileInfo 
+ * object which should be filled with relevant information */
+
+#pragma once
+
+#if !defined (NAUTILUS_EXTENSION_H) && !defined (NAUTILUS_COMPILATION)
+#warning "Only <nautilus-extension.h> should be included directly."
+#endif
+
+#include <glib-object.h>
+#include "nautilus-file-info.h"
+
+G_BEGIN_DECLS
+
+#define NAUTILUS_TYPE_INFO_PROVIDER (nautilus_info_provider_get_type ())
+
+G_DECLARE_INTERFACE (NautilusInfoProvider, nautilus_info_provider,
+                     NAUTILUS, INFO_PROVIDER,
+                     GObject)
+
+/**
+ * SECTION:nautilus-info-provider
+ * @title: NautilusInfoProvider
+ * @short_description: Interface to provide additional information about files
+ *
+ * #NautilusInfoProvider allows extension to provide additional information about
+ * files. When nautilus_info_provider_update_file_info() is called by the application,
+ * extensions will know that it's time to add extra information to the provided
+ * #NautilusFileInfo.
+ */
+
+/**
+ * NautilusOperationHandle:
+ *
+ * Handle for asynchronous interfaces. These are opaque handles that must
+ * be unique within an extension object. These are returned by operations
+ * that return #NAUTILUS_OPERATION_IN_PROGRESS.
+ */
+typedef struct _NautilusOperationHandle NautilusOperationHandle;
+
+/**
+ * NautilusOperationResult:
+ * @NAUTILUS_OPERATION_COMPLETE: the operation succeeded, and the extension
+ *  is done with the request.
+ * @NAUTILUS_OPERATION_FAILED: the operation failed.
+ * @NAUTILUS_OPERATION_IN_PROGRESS: the extension has begin an async operation.
+ *  When this value is returned, the extension must set the handle parameter
+ *  and call the callback closure when the operation is complete.
+ *
+ * Return values for asynchronous operations performed by the extension.
+ * See nautilus_info_provider_update_file_info().
+ */
+typedef enum
+{
+    /* Returned if the call succeeded, and the extension is done 
+     * with the request */
+    NAUTILUS_OPERATION_COMPLETE,
+
+    /* Returned if the call failed */
+    NAUTILUS_OPERATION_FAILED,
+
+    /* Returned if the extension has begun an async operation. 
+     * If this is returned, the extension must set the handle 
+     * parameter and call the callback closure when the 
+     * operation is complete. */
+    NAUTILUS_OPERATION_IN_PROGRESS
+} NautilusOperationResult;
+
+/**
+ * NautilusInfoProviderInterface:
+ * @g_iface: The parent interface.
+ * @update_file_info: Returns a #NautilusOperationResult.
+ *                    See nautilus_info_provider_update_file_info() for details.
+ * @cancel_update: Cancels a previous call to nautilus_info_provider_update_file_info().
+ *                 See nautilus_info_provider_cancel_update() for details.
+ *
+ * Interface for extensions to provide additional information about files.
+ */
+struct _NautilusInfoProviderInterface
+{
+    GTypeInterface g_iface;
+
+    NautilusOperationResult (*update_file_info) (NautilusInfoProvider     *provider,
+                                                 NautilusFileInfo         *file,
+                                                 GClosure                 *update_complete,
+                                                 NautilusOperationHandle **handle);
+    void                    (*cancel_update)    (NautilusInfoProvider     *provider,
+                                                 NautilusOperationHandle  *handle);
+};
+
+/* Interface Functions */
+/**
+ * nautilus_info_provider_update_file_info:
+ * @provider: a #NautilusInfoProvider
+ * @file: a #NautilusFileInfo
+ * @update_complete: the closure to invoke at some later time when returning
+ *                   @NAUTILUS_OPERATION_IN_PROGRESS.
+ * @handle: (transfer none) (nullable) (out): an opaque #NautilusOperationHandle
+ *           that must be set when returning @NAUTILUS_OPERATION_IN_PROGRESS.
+ *
+ * Returns: A #NautilusOperationResult.
+ */
+NautilusOperationResult nautilus_info_provider_update_file_info       (NautilusInfoProvider     *provider,
+                                                                       NautilusFileInfo         *file,
+                                                                       GClosure                 *update_complete,
+                                                                       NautilusOperationHandle **handle);
+/**
+ * nautilus_info_provider_cancel_update:
+ * @provider: a #NautilusInfoProvider
+ * @handle: the opaque #NautilusOperationHandle returned from a previous call to
+ *          nautilus_info_provider_update_file_info().
+ */
+void                    nautilus_info_provider_cancel_update          (NautilusInfoProvider     *provider,
+                                                                       NautilusOperationHandle  *handle);
+
+
+
+/* Helper functions for implementations */
+/**
+ * nautilus_info_provider_update_complete_invoke:
+ * @update_complete: a #GClosure
+ * @provider: a #NautilusInfoProvider
+ * @handle: an opaque #NautilusOperationHandle
+ * @result: a #NautilusOperationResult
+ */
+void                    nautilus_info_provider_update_complete_invoke (GClosure                 *update_complete,
+                                                                       NautilusInfoProvider     *provider,
+                                                                       NautilusOperationHandle  *handle,
+                                                                       NautilusOperationResult   result);
+
+G_END_DECLS
diff --git a/libnautilus-extension/nautilus-menu-item.c b/libnautilus-extension/nautilus-menu-item.c
new file mode 100644
index 0000000..50cf7fd
--- /dev/null
+++ b/libnautilus-extension/nautilus-menu-item.c
@@ -0,0 +1,348 @@
+/*
+ *  nautilus-menu-item.c - Menu items exported by NautilusMenuProvider
+ *                         objects.
+ *
+ *  Copyright (C) 2003 Novell, Inc.
+ *
+ *  This library is free software; you can redistribute it and/or
+ *  modify it under the terms of the GNU Library General Public
+ *  License as published by the Free Software Foundation; either
+ *  version 2 of the License, or (at your option) any later version.
+ *
+ *  This library 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
+ *  Library General Public License for more details.
+ *
+ *  You should have received a copy of the GNU Library General Public
+ *  License along with this library; if not, see <http://www.gnu.org/licenses/>.
+ *
+ *  Author:  Dave Camp <dave@ximian.com>
+ *
+ */
+
+#include <config.h>
+#include <glib/gi18n-lib.h>
+#include "nautilus-menu.h"
+
+typedef struct
+{
+    char *name;
+    char *label;
+    char *tip;
+    char *icon;
+    NautilusMenu *menu;
+    gboolean sensitive;
+    gboolean priority;
+} NautilusMenuItemPrivate;
+
+G_DEFINE_TYPE_WITH_PRIVATE (NautilusMenuItem, nautilus_menu_item, G_TYPE_OBJECT)
+
+enum
+{
+    ACTIVATE,
+    LAST_SIGNAL
+};
+
+enum
+{
+    PROP_0,
+    PROP_NAME,
+    PROP_LABEL,
+    PROP_TIP,
+    PROP_ICON,
+    PROP_SENSITIVE,
+    PROP_PRIORITY,
+    PROP_MENU,
+    LAST_PROP
+};
+
+static guint signals[LAST_SIGNAL];
+
+NautilusMenuItem *
+nautilus_menu_item_new (const char *name,
+                        const char *label,
+                        const char *tip,
+                        const char *icon)
+{
+    NautilusMenuItem *item;
+
+    g_return_val_if_fail (name != NULL, NULL);
+    g_return_val_if_fail (label != NULL, NULL);
+
+    item = g_object_new (NAUTILUS_TYPE_MENU_ITEM,
+                         "name", name,
+                         "label", label,
+                         "tip", tip,
+                         "icon", icon,
+                         NULL);
+
+    return item;
+}
+
+void
+nautilus_menu_item_activate (NautilusMenuItem *self)
+{
+    g_return_if_fail (NAUTILUS_IS_MENU_ITEM (self));
+
+    g_signal_emit (self, signals[ACTIVATE], 0);
+}
+
+void
+nautilus_menu_item_set_submenu (NautilusMenuItem *self,
+                                NautilusMenu     *menu)
+{
+    g_return_if_fail (NAUTILUS_IS_MENU_ITEM (self));
+
+    g_object_set (self, "menu", menu, NULL);
+}
+
+static void
+nautilus_menu_item_get_property (GObject    *object,
+                                 guint       param_id,
+                                 GValue     *value,
+                                 GParamSpec *pspec)
+{
+    NautilusMenuItem *item;
+    NautilusMenuItemPrivate *priv;
+
+    item = NAUTILUS_MENU_ITEM (object);
+    priv = nautilus_menu_item_get_instance_private (item);
+
+    switch (param_id)
+    {
+        case PROP_NAME:
+        {
+            g_value_set_string (value, priv->name);
+        }
+        break;
+
+        case PROP_LABEL:
+        {
+            g_value_set_string (value, priv->label);
+        }
+        break;
+
+        case PROP_TIP:
+        {
+            g_value_set_string (value, priv->tip);
+        }
+        break;
+
+        case PROP_ICON:
+        {
+            g_value_set_string (value, priv->icon);
+        }
+        break;
+
+        case PROP_SENSITIVE:
+        {
+            g_value_set_boolean (value, priv->sensitive);
+        }
+        break;
+
+        case PROP_PRIORITY:
+        {
+            g_value_set_boolean (value, priv->priority);
+        }
+        break;
+
+        case PROP_MENU:
+        {
+            g_value_set_object (value, priv->menu);
+        }
+        break;
+
+        default:
+        {
+            G_OBJECT_WARN_INVALID_PROPERTY_ID (object, param_id, pspec);
+        }
+        break;
+    }
+}
+
+static void
+nautilus_menu_item_set_property (GObject      *object,
+                                 guint         param_id,
+                                 const GValue *value,
+                                 GParamSpec   *pspec)
+{
+    NautilusMenuItem *item;
+    NautilusMenuItemPrivate *priv;
+
+    item = NAUTILUS_MENU_ITEM (object);
+    priv = nautilus_menu_item_get_instance_private (item);
+
+    switch (param_id)
+    {
+        case PROP_NAME:
+        {
+            g_free (priv->name);
+            priv->name = g_strdup (g_value_get_string (value));
+            g_object_notify (object, "name");
+        }
+        break;
+
+        case PROP_LABEL:
+        {
+            g_free (priv->label);
+            priv->label = g_strdup (g_value_get_string (value));
+            g_object_notify (object, "label");
+        }
+        break;
+
+        case PROP_TIP:
+        {
+            g_free (priv->tip);
+            priv->tip = g_strdup (g_value_get_string (value));
+            g_object_notify (object, "tip");
+        }
+        break;
+
+        case PROP_ICON:
+        {
+            g_free (priv->icon);
+            priv->icon = g_strdup (g_value_get_string (value));
+            g_object_notify (object, "icon");
+        }
+        break;
+
+        case PROP_SENSITIVE:
+        {
+            priv->sensitive = g_value_get_boolean (value);
+            g_object_notify (object, "sensitive");
+        }
+        break;
+
+        case PROP_PRIORITY:
+        {
+            priv->priority = g_value_get_boolean (value);
+            g_object_notify (object, "priority");
+        }
+        break;
+
+        case PROP_MENU:
+        {
+            if (priv->menu)
+            {
+                g_object_unref (priv->menu);
+            }
+            priv->menu = g_object_ref (g_value_get_object (value));
+            g_object_notify (object, "menu");
+        }
+        break;
+
+        default:
+        {
+            G_OBJECT_WARN_INVALID_PROPERTY_ID (object, param_id, pspec);
+        }
+        break;
+    }
+}
+
+static void
+nautilus_menu_item_finalize (GObject *object)
+{
+    NautilusMenuItem *item;
+    NautilusMenuItemPrivate *priv;
+
+    item = NAUTILUS_MENU_ITEM (object);
+    priv = nautilus_menu_item_get_instance_private (item);
+
+    g_free (priv->name);
+    g_free (priv->label);
+    g_free (priv->tip);
+    g_free (priv->icon);
+    if (priv->menu)
+    {
+        g_object_unref (priv->menu);
+    }
+
+    G_OBJECT_CLASS (nautilus_menu_item_parent_class)->finalize (object);
+}
+
+static void
+nautilus_menu_item_init (NautilusMenuItem *self)
+{
+    NautilusMenuItemPrivate *priv;
+
+    priv = nautilus_menu_item_get_instance_private (self);
+
+    priv->sensitive = TRUE;
+    priv->menu = NULL;
+}
+
+static void
+nautilus_menu_item_class_init (NautilusMenuItemClass *class)
+{
+    G_OBJECT_CLASS (class)->finalize = nautilus_menu_item_finalize;
+    G_OBJECT_CLASS (class)->get_property = nautilus_menu_item_get_property;
+    G_OBJECT_CLASS (class)->set_property = nautilus_menu_item_set_property;
+
+    /**
+     * NautilusMenuItem::activate:
+     * @item: the object which received the signal
+     *
+     * Signals that the user has activated this menu item.
+     */
+    signals[ACTIVATE] =
+        g_signal_new ("activate",
+                      G_TYPE_FROM_CLASS (class),
+                      G_SIGNAL_RUN_LAST,
+                      G_STRUCT_OFFSET (NautilusMenuItemClass,
+                                       activate),
+                      NULL, NULL,
+                      g_cclosure_marshal_VOID__VOID,
+                      G_TYPE_NONE, 0);
+
+    g_object_class_install_property (G_OBJECT_CLASS (class),
+                                     PROP_NAME,
+                                     g_param_spec_string ("name",
+                                                          "Name",
+                                                          "Name of the item",
+                                                          NULL,
+                                                          G_PARAM_CONSTRUCT_ONLY | G_PARAM_WRITABLE | G_PARAM_READABLE));
+    g_object_class_install_property (G_OBJECT_CLASS (class),
+                                     PROP_LABEL,
+                                     g_param_spec_string ("label",
+                                                          "Label",
+                                                          "Label to display to the user",
+                                                          NULL,
+                                                          G_PARAM_READWRITE));
+    g_object_class_install_property (G_OBJECT_CLASS (class),
+                                     PROP_TIP,
+                                     g_param_spec_string ("tip",
+                                                          "Tip",
+                                                          "Tooltip for the menu item",
+                                                          NULL,
+                                                          G_PARAM_READWRITE));
+    g_object_class_install_property (G_OBJECT_CLASS (class),
+                                     PROP_ICON,
+                                     g_param_spec_string ("icon",
+                                                          "Icon",
+                                                          "Name of the icon to display in the menu item",
+                                                          NULL,
+                                                          G_PARAM_READWRITE));
+
+    g_object_class_install_property (G_OBJECT_CLASS (class),
+                                     PROP_SENSITIVE,
+                                     g_param_spec_boolean ("sensitive",
+                                                           "Sensitive",
+                                                           "Whether the menu item is sensitive",
+                                                           TRUE,
+                                                           G_PARAM_READWRITE));
+    g_object_class_install_property (G_OBJECT_CLASS (class),
+                                     PROP_PRIORITY,
+                                     g_param_spec_boolean ("priority",
+                                                           "Priority",
+                                                           "Show priority text in toolbars",
+                                                           TRUE,
+                                                           G_PARAM_READWRITE));
+    g_object_class_install_property (G_OBJECT_CLASS (class),
+                                     PROP_MENU,
+                                     g_param_spec_object ("menu",
+                                                          "Menu",
+                                                          "The menu belonging to this item. May be null.",
+                                                          NAUTILUS_TYPE_MENU,
+                                                          G_PARAM_READWRITE));
+}
diff --git a/libnautilus-extension/nautilus-menu-provider.c b/libnautilus-extension/nautilus-menu-provider.c
new file mode 100644
index 0000000..a5c4682
--- /dev/null
+++ b/libnautilus-extension/nautilus-menu-provider.c
@@ -0,0 +1,94 @@
+/*
+ *  nautilus-property-page-provider.c - Interface for Nautilus extensions
+ *                                      that provide context menu items
+ *                                      for files.
+ *
+ *  Copyright (C) 2003 Novell, Inc.
+ *
+ *  This library is free software; you can redistribute it and/or
+ *  modify it under the terms of the GNU Library General Public
+ *  License as published by the Free Software Foundation; either
+ *  version 2 of the License, or (at your option) any later version.
+ *
+ *  This library 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
+ *  Library General Public License for more details.
+ *
+ *  You should have received a copy of the GNU Library General Public
+ *  License along with this library; if not, see <http://www.gnu.org/licenses/>.
+ *
+ *  Author:  Dave Camp <dave@ximian.com>
+ *
+ */
+
+#include <config.h>
+#include "nautilus-menu-provider.h"
+
+G_DEFINE_INTERFACE (NautilusMenuProvider, nautilus_menu_provider, G_TYPE_OBJECT)
+
+enum
+{
+    ITEMS_UPDATED,
+    LAST_SIGNAL
+};
+
+static guint signals[LAST_SIGNAL];
+
+static void
+nautilus_menu_provider_default_init (NautilusMenuProviderInterface *klass)
+{
+    /* This signal should be emited each time the extension modify the list of menu items */
+    signals[ITEMS_UPDATED] = g_signal_new ("items-updated",
+                                           NAUTILUS_TYPE_MENU_PROVIDER,
+                                           G_SIGNAL_RUN_LAST,
+                                           0,
+                                           NULL, NULL,
+                                           g_cclosure_marshal_VOID__VOID,
+                                           G_TYPE_NONE, 0);
+}
+
+GList *
+nautilus_menu_provider_get_file_items (NautilusMenuProvider *provider,
+                                       GList                *files)
+{
+    NautilusMenuProviderInterface *iface;
+
+    iface = NAUTILUS_MENU_PROVIDER_GET_IFACE (provider);
+
+    g_return_val_if_fail (NAUTILUS_IS_MENU_PROVIDER (provider), NULL);
+
+    if (iface->get_file_items != NULL)
+    {
+        return iface->get_file_items (provider, files);
+    }
+
+    return NULL;
+}
+
+GList *
+nautilus_menu_provider_get_background_items (NautilusMenuProvider *provider,
+                                             NautilusFileInfo     *current_folder)
+{
+    NautilusMenuProviderInterface *iface;
+
+    iface = NAUTILUS_MENU_PROVIDER_GET_IFACE (provider);
+
+    g_return_val_if_fail (NAUTILUS_IS_MENU_PROVIDER (provider), NULL);
+    g_return_val_if_fail (NAUTILUS_IS_FILE_INFO (current_folder), NULL);
+
+    if (iface->get_background_items != NULL)
+    {
+        return iface->get_background_items (provider, current_folder);
+    }
+
+    return NULL;
+}
+
+void
+nautilus_menu_provider_emit_items_updated_signal (NautilusMenuProvider *provider)
+{
+    g_return_if_fail (NAUTILUS_IS_MENU_PROVIDER (provider));
+
+    g_signal_emit (provider, signals[ITEMS_UPDATED], 0);
+}
diff --git a/libnautilus-extension/nautilus-menu-provider.h b/libnautilus-extension/nautilus-menu-provider.h
new file mode 100644
index 0000000..7939f14
--- /dev/null
+++ b/libnautilus-extension/nautilus-menu-provider.h
@@ -0,0 +1,102 @@
+/*
+ *  nautilus-menu-provider.h - Interface for Nautilus extensions that 
+ *                             provide context menu items.
+ *
+ *  Copyright (C) 2003 Novell, Inc.
+ *
+ *  This library is free software; you can redistribute it and/or
+ *  modify it under the terms of the GNU Library General Public
+ *  License as published by the Free Software Foundation; either
+ *  version 2 of the License, or (at your option) any later version.
+ *
+ *  This library 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
+ *  Library General Public License for more details.
+ *
+ *  You should have received a copy of the GNU Library General Public
+ *  License along with this library; if not, see <http://www.gnu.org/licenses/>.
+ * 
+ *  Author:  Dave Camp <dave@ximian.com>
+ *
+ */
+
+/* This interface is implemented by Nautilus extensions that want to
+ * add context menu entries to files.  Extensions are called when
+ * Nautilus constructs the context menu for a file.  They are passed a
+ * list of NautilusFileInfo objects which holds the current selection */
+
+#pragma once
+
+#if !defined (NAUTILUS_EXTENSION_H) && !defined (NAUTILUS_COMPILATION)
+#warning "Only <nautilus-extension.h> should be included directly."
+#endif
+
+#include <glib-object.h>
+#include "nautilus-file-info.h"
+
+G_BEGIN_DECLS
+
+#define NAUTILUS_TYPE_MENU_PROVIDER (nautilus_menu_provider_get_type ())
+
+G_DECLARE_INTERFACE (NautilusMenuProvider, nautilus_menu_provider,
+                     NAUTILUS, MENU_PROVIDER,
+                     GObject)
+
+/**
+ * SECTION:nautilus-menu-provider
+ * @title: NautilusMenuProvider
+ * @short_description: Interface to provide additional menu items
+ *
+ * #NautilusMenuProvider allows extension to provide additional menu items
+ * in the file manager menus.
+ */
+
+/**
+ * NautilusMenuProviderInterface:
+ * @g_iface: The parent interface.
+ * @get_file_items: Returns a #GList of #NautilusMenuItem.
+ *                  See nautilus_menu_provider_get_file_items() for details.
+ * @get_background_items: Returns a #GList of #NautilusMenuItem.
+ *                        See nautilus_menu_provider_get_background_items() for details.
+ *
+ * Interface for extensions to provide additional menu items.
+ */
+struct _NautilusMenuProviderInterface
+{
+    GTypeInterface g_iface;
+
+    GList *(*get_file_items)       (NautilusMenuProvider *provider,
+                                    GList                *files);
+    GList *(*get_background_items) (NautilusMenuProvider *provider,
+                                    NautilusFileInfo     *current_folder);
+};
+
+/**
+ * nautilus_menu_provider_get_file_items:
+ * @provider: a #NautilusMenuProvider
+ * @files: (element-type NautilusFileInfo): a list of #NautilusFileInfo
+ *
+ * Returns: (nullable) (element-type NautilusMenuItem) (transfer full): the provided list of #NautilusMenuItem.
+ */
+GList  *nautilus_menu_provider_get_file_items           (NautilusMenuProvider *provider,
+                                                         GList                *files);
+/**
+ * nautilus_menu_provider_get_background_items:
+ * @provider: a #NautilusMenuProvider
+ * @current_folder: the folder for which background items are requested
+ *
+ * Returns: (nullable) (element-type NautilusMenuItem) (transfer full): the provided list of #NautilusMenuItem.
+ */
+GList *nautilus_menu_provider_get_background_items      (NautilusMenuProvider *provider,
+                                                         NautilusFileInfo     *current_folder);
+
+/**
+ * nautilus_menu_provider_emit_items_updated_signal:
+ * @provider: a #NautilusMenuProvider
+ *
+ * Emits #NautilusMenuProvider::items-updated.
+ */
+void   nautilus_menu_provider_emit_items_updated_signal (NautilusMenuProvider *provider);
+
+G_END_DECLS
diff --git a/libnautilus-extension/nautilus-menu.c b/libnautilus-extension/nautilus-menu.c
new file mode 100644
index 0000000..34eab8f
--- /dev/null
+++ b/libnautilus-extension/nautilus-menu.c
@@ -0,0 +1,98 @@
+/*
+ *  nautilus-menu.h - Menus exported by NautilusMenuProvider objects.
+ *
+ *  Copyright (C) 2005 Raffaele Sandrini
+ *
+ *  This library is free software; you can redistribute it and/or
+ *  modify it under the terms of the GNU Library General Public
+ *  License as published by the Free Software Foundation; either
+ *  version 2 of the License, or (at your option) any later version.
+ *
+ *  This library 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
+ *  Library General Public License for more details.
+ *
+ *  You should have received a copy of the GNU Library General Public
+ *  License along with this library; if not, see <http://www.gnu.org/licenses/>.
+ *
+ *  Author:  Raffaele Sandrini <rasa@gmx.ch>
+ *
+ */
+
+#include <config.h>
+#include "nautilus-menu.h"
+
+#include <glib.h>
+#include <glib/gi18n-lib.h>
+
+struct _NautilusMenu
+{
+    GObject parent_instance;
+
+    GList *item_list;
+};
+
+G_DEFINE_TYPE (NautilusMenu, nautilus_menu, G_TYPE_OBJECT);
+
+void
+nautilus_menu_append_item (NautilusMenu     *self,
+                           NautilusMenuItem *menu_item)
+{
+    g_return_if_fail (NAUTILUS_IS_MENU (self));
+    g_return_if_fail (NAUTILUS_IS_MENU_ITEM (menu_item));
+
+    self->item_list = g_list_append (self->item_list, g_object_ref (menu_item));
+}
+
+GList *
+nautilus_menu_get_items (NautilusMenu *self)
+{
+    GList *item_list;
+
+    g_return_val_if_fail (NAUTILUS_IS_MENU (self), NULL);
+
+    item_list = g_list_copy (self->item_list);
+    g_list_foreach (item_list, (GFunc) g_object_ref, NULL);
+
+    return item_list;
+}
+
+void
+nautilus_menu_item_list_free (GList *item_list)
+{
+    g_return_if_fail (item_list != NULL);
+
+    g_list_foreach (item_list, (GFunc) g_object_unref, NULL);
+    g_list_free (item_list);
+}
+
+static void
+nautilus_menu_finalize (GObject *object)
+{
+    NautilusMenu *menu = NAUTILUS_MENU (object);
+
+    g_clear_pointer (&menu->item_list, g_list_free);
+
+    G_OBJECT_CLASS (nautilus_menu_parent_class)->finalize (object);
+}
+
+static void
+nautilus_menu_init (NautilusMenu *self)
+{
+    self->item_list = NULL;
+}
+
+static void
+nautilus_menu_class_init (NautilusMenuClass *klass)
+{
+    GObjectClass *object_class = G_OBJECT_CLASS (klass);
+
+    object_class->finalize = nautilus_menu_finalize;
+}
+
+NautilusMenu *
+nautilus_menu_new (void)
+{
+    return g_object_new (NAUTILUS_TYPE_MENU, NULL);
+}
diff --git a/libnautilus-extension/nautilus-menu.h b/libnautilus-extension/nautilus-menu.h
new file mode 100644
index 0000000..c483716
--- /dev/null
+++ b/libnautilus-extension/nautilus-menu.h
@@ -0,0 +1,143 @@
+/*
+ *  nautilus-menu.h - Menus exported by NautilusMenuProvider objects.
+ *
+ *  Copyright (C) 2005 Raffaele Sandrini
+ *  Copyright (C) 2003 Novell, Inc.
+ *
+ *  This library is free software; you can redistribute it and/or
+ *  modify it under the terms of the GNU Library General Public
+ *  License as published by the Free Software Foundation; either
+ *  version 2 of the License, or (at your option) any later version.
+ *
+ *  This library 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
+ *  Library General Public License for more details.
+ *
+ *  You should have received a copy of the GNU Library General Public
+ *  License along with this library; if not, see <http://www.gnu.org/licenses/>.
+ * 
+ *  Author:  Dave Camp <dave@ximian.com>
+ *           Raffaele Sandrini <rasa@gmx.ch>
+ *
+ */
+
+#pragma once
+
+#if !defined (NAUTILUS_EXTENSION_H) && !defined (NAUTILUS_COMPILATION)
+#warning "Only <nautilus-extension.h> should be included directly."
+#endif
+
+#include <glib-object.h>
+
+G_BEGIN_DECLS
+
+#define NAUTILUS_TYPE_MENU (nautilus_menu_get_type ())
+#define NAUTILUS_TYPE_MENU_ITEM (nautilus_menu_item_get_type ())
+
+G_DECLARE_FINAL_TYPE     (NautilusMenu, nautilus_menu,
+                          NAUTILUS, MENU,
+                          GObject)
+G_DECLARE_DERIVABLE_TYPE (NautilusMenuItem, nautilus_menu_item,
+                          NAUTILUS, MENU_ITEM,
+                          GObject)
+
+/**
+ * SECTION:nautilus-menu
+ * @title: NautilusMenu
+ * @short_description: Menu descriptor object
+ *
+ * #NautilusMenu is an object that describes a submenu in a file manager
+ * menu. Extensions can provide #NautilusMenu objects by attaching them to
+ * #NautilusMenuItem objects, using nautilus_menu_item_set_submenu().
+ *
+ * ## Menu Items
+ *
+ * #NautilusMenuItem is an object that describes an item in a file manager
+ * menu. Extensions can provide #NautilusMenuItem objects by registering a
+ * #NautilusMenuProvider and returning them from
+ * nautilus_menu_provider_get_file_items(), or
+ * nautilus_menu_provider_get_background_items(), which will be called by the
+ * main application when creating menus.
+ */
+
+struct _NautilusMenuItemClass
+{
+    GObjectClass parent;
+
+    void (*activate) (NautilusMenuItem *item);
+};
+
+/**
+ * nautilus_menu_new:
+ *
+ * Returns: a new #NautilusMenu.
+ */
+NautilusMenu     *nautilus_menu_new              (void);
+
+/**
+ * nautilus_menu_append_item:
+ * @menu: a #NautilusMenu
+ * @item: (transfer full): a #NautilusMenuItem to append
+ */
+void              nautilus_menu_append_item      (NautilusMenu     *menu,
+                                                  NautilusMenuItem *item);
+/**
+ * nautilus_menu_get_items:
+ * @menu: a #NautilusMenu
+ *
+ * Returns: (nullable) (element-type NautilusMenuItem) (transfer full): the provided #NautilusMenuItem list
+ */
+GList            *nautilus_menu_get_items        (NautilusMenu     *menu);
+/**
+ * nautilus_menu_item_list_free:
+ * @item_list: (element-type NautilusMenuItem): a list of #NautilusMenuItem
+ *
+ */
+void              nautilus_menu_item_list_free   (GList            *item_list);
+
+/**
+ * nautilus_menu_item_new:
+ * @name: the identifier for the menu item
+ * @label: the user-visible label of the menu item
+ * @tip: (nullable): the tooltip of the menu item
+ * @icon: (nullable): the name of the icon to display in the menu item
+ *
+ * Creates a new menu item that can be added to the toolbar or to a contextual menu.
+ *
+ * Returns: (transfer full): a new #NautilusMenuItem
+ */
+NautilusMenuItem *nautilus_menu_item_new         (const char       *name,
+                                                  const char       *label,
+                                                  const char       *tip,
+                                                  const char       *icon);
+
+/**
+ * nautilus_menu_item_activate:
+ * @item: pointer to a #NautilusMenuItem
+ *
+ * Emits #NautilusMenuItem::activate.
+ */
+void              nautilus_menu_item_activate    (NautilusMenuItem *item);
+/**
+ * nautilus_menu_item_set_submenu:
+ * @item: pointer to a #NautilusMenuItem
+ * @menu: (transfer full): pointer to a #NautilusMenu to attach to the button
+ *
+ * Attaches a menu to the given #NautilusMenuItem.
+ */
+void              nautilus_menu_item_set_submenu (NautilusMenuItem *item,
+                                                  NautilusMenu     *menu);
+
+/* NautilusMenuItem has the following properties:
+ *   name (string)        - the identifier for the menu item
+ *   label (string)       - the user-visible label of the menu item
+ *   tip (string)         - the tooltip of the menu item 
+ *   icon (string)        - the name of the icon to display in the menu item
+ *   sensitive (boolean)  - whether the menu item is sensitive or not
+ *   priority (boolean)   - used for toolbar items, whether to show priority
+ *                          text.
+ *   menu (NautilusMenu)  - The menu belonging to this item. May be null.
+ */
+
+G_END_DECLS
diff --git a/libnautilus-extension/nautilus-properties-item.c b/libnautilus-extension/nautilus-properties-item.c
new file mode 100644
index 0000000..8731274
--- /dev/null
+++ b/libnautilus-extension/nautilus-properties-item.c
@@ -0,0 +1,149 @@
+/*
+ * Copyright (C) 2022 António Fernandes <antoniof@gnome.org>
+ *
+ * SPDX-License-Identifier: GPL-2.0-or-later
+ */
+
+#include <config.h>
+#include "nautilus-properties-item.h"
+
+enum
+{
+    PROP_0,
+    PROP_NAME,
+    PROP_VALUE,
+    LAST_PROP
+};
+
+struct _NautilusPropertiesItem
+{
+    GObject parent_instance;
+
+    char *name;
+    char *value;
+};
+
+G_DEFINE_TYPE (NautilusPropertiesItem, nautilus_properties_item, G_TYPE_OBJECT)
+
+NautilusPropertiesItem *
+nautilus_properties_item_new (const char *name,
+                              const char *value)
+{
+    g_return_val_if_fail (name != NULL, NULL);
+    g_return_val_if_fail (name != NULL, NULL);
+
+    return g_object_new (NAUTILUS_TYPE_PROPERTIES_ITEM,
+                         "name", name,
+                         "value", value,
+                         NULL);
+}
+
+static void
+nautilus_properties_item_get_property (GObject    *object,
+                                       guint       param_id,
+                                       GValue     *value,
+                                       GParamSpec *pspec)
+{
+    NautilusPropertiesItem *self = NAUTILUS_PROPERTIES_ITEM (object);
+
+    switch (param_id)
+    {
+        case PROP_NAME:
+        {
+            g_value_set_string (value, self->name);
+        }
+        break;
+
+        case PROP_VALUE:
+        {
+            g_value_set_string (value, self->value);
+        }
+        break;
+
+        default:
+        {
+            G_OBJECT_WARN_INVALID_PROPERTY_ID (object, param_id, pspec);
+        }
+        break;
+    }
+}
+
+static void
+nautilus_properties_item_set_property (GObject      *object,
+                                       guint         param_id,
+                                       const GValue *value,
+                                       GParamSpec   *pspec)
+{
+    NautilusPropertiesItem *self = NAUTILUS_PROPERTIES_ITEM (object);
+
+    switch (param_id)
+    {
+        case PROP_NAME:
+        {
+            g_free (self->name);
+            self->name = g_value_dup_string (value);
+        }
+        break;
+
+        case PROP_VALUE:
+        {
+            g_free (self->value);
+            self->value = g_value_dup_string (value);
+        }
+        break;
+
+        default:
+        {
+            G_OBJECT_WARN_INVALID_PROPERTY_ID (object, param_id, pspec);
+        }
+        break;
+    }
+}
+
+static void
+nautilus_properties_item_finalize (GObject *object)
+{
+    NautilusPropertiesItem *self = NAUTILUS_PROPERTIES_ITEM (object);
+
+    g_free (self->name);
+    g_free (self->value);
+
+    G_OBJECT_CLASS (nautilus_properties_item_parent_class)->finalize (object);
+}
+
+static void
+nautilus_properties_item_init (NautilusPropertiesItem *self)
+{
+}
+
+static void
+nautilus_properties_item_class_init (NautilusPropertiesItemClass *class)
+{
+    GParamSpec *pspec;
+
+    G_OBJECT_CLASS (class)->finalize = nautilus_properties_item_finalize;
+    G_OBJECT_CLASS (class)->get_property = nautilus_properties_item_get_property;
+    G_OBJECT_CLASS (class)->set_property = nautilus_properties_item_set_property;
+
+    pspec = g_param_spec_string ("name", "", "",
+                                 NULL,
+                                 G_PARAM_CONSTRUCT_ONLY | G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS);
+    g_object_class_install_property (G_OBJECT_CLASS (class), PROP_NAME, pspec);
+
+    pspec = g_param_spec_string ("value", "", "",
+                                 NULL,
+                                 G_PARAM_CONSTRUCT_ONLY | G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS);
+    g_object_class_install_property (G_OBJECT_CLASS (class), PROP_VALUE, pspec);
+}
+
+const char *
+nautilus_properties_item_get_name (NautilusPropertiesItem *self)
+{
+    return self->name;
+}
+
+const char *
+nautilus_properties_item_get_value (NautilusPropertiesItem *self)
+{
+    return self->value;
+}
diff --git a/libnautilus-extension/nautilus-properties-item.h b/libnautilus-extension/nautilus-properties-item.h
new file mode 100644
index 0000000..c55fb91
--- /dev/null
+++ b/libnautilus-extension/nautilus-properties-item.h
@@ -0,0 +1,61 @@
+/*
+ * Copyright (C) 2022 António Fernandes <antoniof@gnome.org>
+ *
+ * SPDX-License-Identifier: GPL-2.0-or-later
+ */
+
+#pragma once
+
+#if !defined (NAUTILUS_EXTENSION_H) && !defined (NAUTILUS_COMPILATION)
+#warning "Only <nautilus-extension.h> should be included directly."
+#endif
+
+#include <glib-object.h>
+
+G_BEGIN_DECLS
+
+#define NAUTILUS_TYPE_PROPERTIES_ITEM (nautilus_properties_item_get_type ())
+
+G_DECLARE_FINAL_TYPE (NautilusPropertiesItem,
+                      nautilus_properties_item,
+                      NAUTILUS, PROPERTIES_ITEM,
+                      GObject)
+
+/**
+ * SECTION:nautilus-properties-item
+ * @name: NautilusPropertiesItem
+ * @value: Properties item descriptor object
+ *
+ * #NautilusPropertiesItem is an object that describes a name & value pair in
+ * file properties. Extensions can provide #NautilusPropertiesItem objects in
+ * models provided by #NautilusPropertiesModel.
+ */
+
+/**
+ * nautilus_properties_item_new:
+ * @name: the user-visible name for the properties item.
+ * @value: the user-visible value for the properties item.
+ *
+ * Returns: (transfer full): a new #NautilusPropertiesItem
+ */
+NautilusPropertiesItem *nautilus_properties_item_new (const char *name,
+                                                      const char *value);
+
+/**
+ * nautilus_properties_item_get_name:
+ * @self: the properties item
+ *
+ * Returns: (transfer none): the name of this #NautilusPropertiesItem
+ */
+const char *nautilus_properties_item_get_name (NautilusPropertiesItem *self);
+
+/**
+ * nautilus_properties_item_get_value:
+ * @self: the properties item
+ *
+ * Returns: (transfer none): the value of this #NautilusPropertiesItem
+ */
+const char * nautilus_properties_item_get_value (NautilusPropertiesItem *self);
+
+
+G_END_DECLS
diff --git a/libnautilus-extension/nautilus-properties-model-provider.c b/libnautilus-extension/nautilus-properties-model-provider.c
new file mode 100644
index 0000000..4ade110
--- /dev/null
+++ b/libnautilus-extension/nautilus-properties-model-provider.c
@@ -0,0 +1,29 @@
+/*
+ * Copyright (C) 2022 The GNOME project contributors
+ *
+ * SPDX-License-Identifier: GPL-2.0-or-later
+ */
+
+#include "nautilus-properties-model-provider.h"
+
+G_DEFINE_INTERFACE (NautilusPropertiesModelProvider, nautilus_properties_model_provider, G_TYPE_OBJECT)
+
+static void
+nautilus_properties_model_provider_default_init (NautilusPropertiesModelProviderInterface *klass)
+{
+}
+
+GList *
+nautilus_properties_model_provider_get_models (NautilusPropertiesModelProvider *self,
+                                               GList                           *files)
+{
+    NautilusPropertiesModelProviderInterface *iface;
+
+    g_return_val_if_fail (NAUTILUS_IS_PROPERTIES_MODEL_PROVIDER (self), NULL);
+
+    iface = NAUTILUS_PROPERTIES_MODEL_PROVIDER_GET_IFACE (self);
+
+    g_return_val_if_fail (iface->get_models != NULL, NULL);
+
+    return iface->get_models (self, files);
+}
diff --git a/libnautilus-extension/nautilus-properties-model-provider.h b/libnautilus-extension/nautilus-properties-model-provider.h
new file mode 100644
index 0000000..b4ecda5
--- /dev/null
+++ b/libnautilus-extension/nautilus-properties-model-provider.h
@@ -0,0 +1,66 @@
+/*
+ * Copyright (C) 2022 The GNOME project contributors
+ *
+ * SPDX-License-Identifier: GPL-2.0-or-later
+ */
+
+#pragma once
+
+#if !defined (NAUTILUS_EXTENSION_H) && !defined (NAUTILUS_COMPILATION)
+#warning "Only <nautilus-extension.h> should be included directly."
+#endif
+
+#include <glib-object.h>
+
+G_BEGIN_DECLS
+
+#define NAUTILUS_TYPE_PROPERTIES_MODEL_PROVIDER (nautilus_properties_model_provider_get_type ())
+
+G_DECLARE_INTERFACE (NautilusPropertiesModelProvider,
+                     nautilus_properties_model_provider,
+                     NAUTILUS, PROPERTIES_MODEL_PROVIDER,
+                     GObject)
+
+/**
+ * SECTION:nautilus-properties-model-provider
+ * @title: NautilusPropertiesModelProvider
+ * @short_description: Interface to provide additional properties
+ *
+ * #NautilusPropertiesModelProvider allows extension to provide additional
+ * information for the file properties.
+ */
+
+/**
+ * NautilusPropertiesModelProviderInterface:
+ * @g_iface: The parent interface.
+ * @get_models: Returns a #GList of #NautilusPropertiesModel.
+ *   See nautilus_properties_model_provider_get_models() for details.
+ *
+ * Interface for extensions to provide additional properties.
+ */
+struct _NautilusPropertiesModelProviderInterface
+{
+    GTypeInterface g_iface;
+
+    GList *(*get_models) (NautilusPropertiesModelProvider *provider,
+                          GList                           *files);
+};
+
+/**
+ * nautilus_properties_model_provider_get_models:
+ * @provider: a #NautilusPropertiesModelProvider
+ * @files: (element-type NautilusFileInfo): a #GList of #NautilusFileInfo
+ *
+ * This function is called by the application when it wants properties models
+ * from the extension.
+ *
+ * This function is called in the main thread before the Properties are shown,
+ * so it should return quickly. The models can be populated and updated
+ * asynchronously.
+ *
+ * Returns: (nullable) (element-type NautilusPropertiesModel) (transfer full): A #GList of allocated #NautilusPropertiesModel models.
+ */
+GList *nautilus_properties_model_provider_get_models (NautilusPropertiesModelProvider *provider,
+                                                      GList                           *files);
+
+G_END_DECLS
diff --git a/libnautilus-extension/nautilus-properties-model.c b/libnautilus-extension/nautilus-properties-model.c
new file mode 100644
index 0000000..b222ae0
--- /dev/null
+++ b/libnautilus-extension/nautilus-properties-model.c
@@ -0,0 +1,167 @@
+/*
+ * Copyright (C) 2022 The GNOME project contributors
+ *
+ * SPDX-License-Identifier: GPL-2.0-or-later
+ */
+
+#include <config.h>
+#include "nautilus-properties-model.h"
+#include "nautilus-properties-item.h"
+
+enum
+{
+    PROP_0,
+    PROP_TITLE,
+    PROP_MODEL,
+    LAST_PROP
+};
+
+struct _NautilusPropertiesModel
+{
+    GObject parent_instance;
+
+    char *title;
+    GListModel *model;
+};
+
+G_DEFINE_TYPE (NautilusPropertiesModel, nautilus_properties_model, G_TYPE_OBJECT)
+
+NautilusPropertiesModel *
+nautilus_properties_model_new (const char *title,
+                               GListModel *model)
+{
+    g_return_val_if_fail (title != NULL, NULL);
+    g_return_val_if_fail (G_IS_LIST_MODEL (model), NULL);
+    g_return_val_if_fail (g_list_model_get_item_type (model) == NAUTILUS_TYPE_PROPERTIES_ITEM, NULL);
+
+    return g_object_new (NAUTILUS_TYPE_PROPERTIES_MODEL,
+                         "title", title,
+                         "model", model,
+                         NULL);
+}
+
+static void
+nautilus_properties_model_get_property (GObject    *object,
+                                        guint       param_id,
+                                        GValue     *value,
+                                        GParamSpec *pspec)
+{
+    NautilusPropertiesModel *self = NAUTILUS_PROPERTIES_MODEL (object);
+
+    switch (param_id)
+    {
+        case PROP_TITLE:
+        {
+            g_value_set_string (value, self->title);
+        }
+        break;
+
+        case PROP_MODEL:
+        {
+            g_value_set_object (value, self->model);
+        }
+        break;
+
+        default:
+        {
+            G_OBJECT_WARN_INVALID_PROPERTY_ID (object, param_id, pspec);
+        }
+        break;
+    }
+}
+
+static void
+nautilus_properties_model_set_property (GObject      *object,
+                                        guint         param_id,
+                                        const GValue *value,
+                                        GParamSpec   *pspec)
+{
+    NautilusPropertiesModel *self = NAUTILUS_PROPERTIES_MODEL (object);
+
+    switch (param_id)
+    {
+        case PROP_TITLE:
+        {
+            g_free (self->title);
+            self->title = g_value_dup_string (value);
+        }
+        break;
+
+        case PROP_MODEL:
+        {
+            g_set_object (&self->model, g_value_get_object (value));
+        }
+        break;
+
+        default:
+        {
+            G_OBJECT_WARN_INVALID_PROPERTY_ID (object, param_id, pspec);
+        }
+        break;
+    }
+}
+
+static void
+nautilus_properties_model_dispose (GObject *object)
+{
+    NautilusPropertiesModel *self = NAUTILUS_PROPERTIES_MODEL (object);
+
+    g_clear_object (&self->model);
+
+    G_OBJECT_CLASS (nautilus_properties_model_parent_class)->dispose (object);
+}
+
+static void
+nautilus_properties_model_finalize (GObject *object)
+{
+    NautilusPropertiesModel *self = NAUTILUS_PROPERTIES_MODEL (object);
+
+    g_free (self->title);
+
+    G_OBJECT_CLASS (nautilus_properties_model_parent_class)->finalize (object);
+}
+
+static void
+nautilus_properties_model_init (NautilusPropertiesModel *self)
+{
+}
+
+static void
+nautilus_properties_model_class_init (NautilusPropertiesModelClass *class)
+{
+    GParamSpec *pspec;
+
+    G_OBJECT_CLASS (class)->finalize = nautilus_properties_model_finalize;
+    G_OBJECT_CLASS (class)->dispose = nautilus_properties_model_dispose;
+    G_OBJECT_CLASS (class)->get_property = nautilus_properties_model_get_property;
+    G_OBJECT_CLASS (class)->set_property = nautilus_properties_model_set_property;
+
+    pspec = g_param_spec_string ("title", "", "",
+                                 NULL,
+                                 G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS);
+    g_object_class_install_property (G_OBJECT_CLASS (class), PROP_TITLE, pspec);
+
+    pspec = g_param_spec_object ("model", "", "",
+                                 G_TYPE_LIST_MODEL,
+                                 G_PARAM_CONSTRUCT_ONLY | G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS);
+    g_object_class_install_property (G_OBJECT_CLASS (class), PROP_MODEL, pspec);
+}
+
+const char *
+nautilus_properties_model_get_title (NautilusPropertiesModel *self)
+{
+    return self->title;
+}
+
+void
+nautilus_properties_model_set_title (NautilusPropertiesModel *self,
+                                     const char              *title)
+{
+    g_object_set (self, "title", title, NULL);
+}
+
+GListModel *
+nautilus_properties_model_get_model (NautilusPropertiesModel *self)
+{
+    return self->model;
+}
diff --git a/libnautilus-extension/nautilus-properties-model.h b/libnautilus-extension/nautilus-properties-model.h
new file mode 100644
index 0000000..3b60ba9
--- /dev/null
+++ b/libnautilus-extension/nautilus-properties-model.h
@@ -0,0 +1,71 @@
+/*
+ * Copyright (C) 2022 The GNOME project contributors
+ *
+ * SPDX-License-Identifier: GPL-2.0-or-later
+ */
+
+#pragma once
+
+#if !defined (NAUTILUS_EXTENSION_H) && !defined (NAUTILUS_COMPILATION)
+#warning "Only <nautilus-extension.h> should be included directly."
+#endif
+
+#include <gio/gio.h>
+
+G_BEGIN_DECLS
+
+#define NAUTILUS_TYPE_PROPERTIES_MODEL (nautilus_properties_model_get_type ())
+
+G_DECLARE_FINAL_TYPE (NautilusPropertiesModel,
+                      nautilus_properties_model,
+                      NAUTILUS, PROPERTIES_MODEL,
+                      GObject)
+
+/**
+ * SECTION:nautilus-properties-model
+ * @title: NautilusPropertiesModel
+ * @short_description: Properties set descriptor model
+ *
+ * #NautilusPropertiesModel is an model that describes a set of file properties.
+ * Extensions can provide #NautilusPropertiesModel objects by registering a
+ * #NautilusPropertiesModelProvider and returning them from
+ * nautilus_properties_model_provider_get_models(), which will be called by
+ * the main application when creating file properties.
+ */
+
+/**
+ * nautilus_properties_model_new:
+ * @title: the user-visible name for the set of properties in this model
+ * @model: a #GListModel containing #NautilusPropertyItem objects.
+ *
+ * Returns: (transfer full): a new #NautilusPropertiesModel
+ */
+NautilusPropertiesModel *nautilus_properties_model_new (const char *title,
+                                                        GListModel *model);
+
+/**
+ * nautilus_properties_model_get_title:
+ * @self: the properties model
+ *
+ * Returns: (transfer none): the title of this #NautilusPropertiesModel
+ */
+const char *nautilus_properties_model_get_title (NautilusPropertiesModel *self);
+
+/**
+ * nautilus_properties_model_set_title:
+ * @self: the properties model
+ * @title: the new title of this #NautilusPropertiesModel
+ */
+void nautilus_properties_model_set_title (NautilusPropertiesModel *self,
+                                          const char              *title);
+
+/**
+ * nautilus_properties_model_get_model:
+ * @self: the properties model
+ *
+ * Returns: (transfer none): a #GListModel containing #NautilusPropertiesItem.
+ */
+GListModel * nautilus_properties_model_get_model (NautilusPropertiesModel *self);
+
+
+G_END_DECLS