[nautilus-actions] Define new duplicate_data NAIIProvider interface

[Pierre Wieser <pwieser src gnome org>]

commit 9fe6ec507ca753ae43f71cf5e7f9acb6cd3aaad8
Author: Pierre Wieser <pwieser trychlos org>
Date:   Fri Jun 18 10:57:48 2010 +0200

    Define new duplicate_data NAIIProvider interface

 ChangeLog                    |    8 ++++++++
 src/api/na-iio-provider.h    |   15 +++++++++++++++
 src/core/na-iio-provider.c   |    1 +
 src/core/na-io-provider.c    |   42 ++++++++++++++++++++++++++++++++++++++++++
 src/core/na-io-provider.h    |    5 +++--
 src/io-desktop/nadp-writer.c |    1 +
 6 files changed, 70 insertions(+), 2 deletions(-)
---
diff --git a/ChangeLog b/ChangeLog
index 0c3b99b..dcc48bd 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,11 @@
+2010-06-18 Pierre Wieser <pwieser trychlos org>
+
+	* src/api/na-iio-provider.h:
+	* src/core/na-iio-provider.c (duplicate_data):
+	* src/core/na-io-provider.c:
+	* src/core/na-io-provider.h (na_io_provider_duplicate_data):
+	Define new NAIIOProvider interface.
+
 2010-06-17 Pierre Wieser <pwieser trychlos org>
 
 	* src/api/na-iio-provider.h:
diff --git a/src/api/na-iio-provider.h b/src/api/na-iio-provider.h
index e3107ad..52d0be6 100644
--- a/src/api/na-iio-provider.h
+++ b/src/api/na-iio-provider.h
@@ -193,6 +193,21 @@ typedef struct {
 	 * successfull, or another code depending of the detected error.
 	 */
 	guint    ( *delete_item )        ( const NAIIOProvider *instance, const NAObjectItem *item, GSList **messages );
+
+	/**
+	 * duplicate_data:
+	 * @instance: the #NAIIOProvider provider.
+	 * @dest: a #NAObjectItem-derived item, menu or action.
+	 * @source: a #NAObjectItem-derived item, menu or action.
+	 * @messages: a pointer to a #GSList list of strings; the provider
+	 *  may append messages to this list, but shouldn't reinitialize it.
+	 *
+	 * Duplicates provider data (if any) from @source to @dest.
+	 *
+	 * Returns: %NA_IIO_PROVIDER_CODE_OK if the duplicate operation was
+	 * successfull, or another code depending of the detected error.
+	 */
+	guint    ( *duplicate_data )     ( const NAIIOProvider *instance, NAObjectItem *dest, const NAObjectItem *source, GSList **messages );
 }
 	NAIIOProviderInterface;
 
diff --git a/src/core/na-iio-provider.c b/src/core/na-iio-provider.c
index 3567f09..8d6be7f 100644
--- a/src/core/na-iio-provider.c
+++ b/src/core/na-iio-provider.c
@@ -125,6 +125,7 @@ interface_base_init( NAIIOProviderInterface *klass )
 		klass->is_able_to_write = do_is_able_to_write;
 		klass->write_item = NULL;
 		klass->delete_item = NULL;
+		klass->duplicate_data = NULL;
 
 		/* register the signal (without any default handler)
 		 * this signal should be sent by the #NAIIOProvider instance when
diff --git a/src/core/na-io-provider.c b/src/core/na-io-provider.c
index d7e68da..5702c96 100644
--- a/src/core/na-io-provider.c
+++ b/src/core/na-io-provider.c
@@ -1235,6 +1235,48 @@ na_io_provider_delete_item( const NAIOProvider *provider, const NAObjectItem *it
 }
 
 /**
+ * na_io_provider_duplicate_data:
+ * @provider: this #NAIOProvider object.
+ * @dest: the target #NAObjectItem item.
+ * @source: the source #NAObjectItem item.
+ * @messages: error messages.
+ *
+ * Duplicates provider data (if any) from @source to @dest.
+ *
+ * Returns: the NAIIOProvider return code.
+ */
+guint
+na_io_provider_duplicate_data( const NAIOProvider *provider, NAObjectItem *dest, const NAObjectItem *source, GSList **messages )
+{
+	static const gchar *thisfn = "na_io_provider_duplicate_data";
+	guint ret;
+	void *provider_data;
+
+	g_debug( "%s: provider=%p (%s), dest=%p (%s), source=%p (%s), messages=%p", thisfn,
+			( void * ) provider, G_OBJECT_TYPE_NAME( provider ),
+			( void * ) dest, G_OBJECT_TYPE_NAME( dest ),
+			( void * ) source, G_OBJECT_TYPE_NAME( source ),
+			( void * ) messages );
+
+	ret = NA_IIO_PROVIDER_CODE_PROGRAM_ERROR;
+
+	g_return_val_if_fail( NA_IS_IO_PROVIDER( provider ), ret );
+	g_return_val_if_fail( NA_IS_OBJECT_ITEM( dest ), ret );
+	g_return_val_if_fail( NA_IS_OBJECT_ITEM( source ), ret );
+	g_return_val_if_fail( NA_IS_IIO_PROVIDER( provider->private->provider ), ret );
+
+	na_object_set_provider_data( dest, NULL );
+	provider_data = na_object_get_provider_data( source );
+
+	if( provider_data &&
+		NA_IIO_PROVIDER_GET_INTERFACE( provider->private->provider )->duplicate_data ){
+			ret = NA_IIO_PROVIDER_GET_INTERFACE( provider->private->provider )->duplicate_data( provider->private->provider, dest, source, messages );
+	}
+
+	return( ret );
+}
+
+/**
  * na_io_provider_get_readonly_tooltip:
  * @reason: the reason for why an item is not writable.
  *
diff --git a/src/core/na-io-provider.h b/src/core/na-io-provider.h
index 8f3f50c..2f8fb39 100644
--- a/src/core/na-io-provider.h
+++ b/src/core/na-io-provider.h
@@ -98,8 +98,9 @@ gboolean       na_io_provider_is_willing_to_write        ( const NAIOProvider *p
 gboolean       na_io_provider_is_able_to_write           ( const NAIOProvider *provider );
 gboolean       na_io_provider_has_write_api              ( const NAIOProvider *provider );
 
-guint          na_io_provider_write_item ( const NAIOProvider *provider, const NAObjectItem *item, GSList **messages );
-guint          na_io_provider_delete_item( const NAIOProvider *provider, const NAObjectItem *item, GSList **messages );
+guint          na_io_provider_write_item    ( const NAIOProvider *provider, const NAObjectItem *item, GSList **messages );
+guint          na_io_provider_delete_item   ( const NAIOProvider *provider, const NAObjectItem *item, GSList **messages );
+guint          na_io_provider_duplicate_data( const NAIOProvider *provider, NAObjectItem *dest, const NAObjectItem *source, GSList **messages );
 
 gchar         *na_io_provider_get_readonly_tooltip( guint reason );
 gchar         *na_io_provider_get_return_code_label( guint code );
diff --git a/src/io-desktop/nadp-writer.c b/src/io-desktop/nadp-writer.c
index a33d46f..4b1b03e 100644
--- a/src/io-desktop/nadp-writer.c
+++ b/src/io-desktop/nadp-writer.c
@@ -133,6 +133,7 @@ nadp_iio_provider_write_item( const NAIIOProvider *provider, const NAObjectItem
 		subdirs = na_core_utils_slist_from_split( NADP_DESKTOP_PROVIDER_SUBDIRS, G_SEARCHPATH_SEPARATOR_S );
 		fulldir = g_build_filename( userdir, ( gchar * ) subdirs->data, NULL );
 		dir_ok = TRUE;
+
 		if( !g_file_test( fulldir, G_FILE_TEST_IS_DIR )){
 			if( g_mkdir_with_parents( fulldir, 0700 )){
 				g_warning( "%s: %s: %s", thisfn, userdir, g_strerror( errno ));