subversion

This is a first pass. It drives only the file methods in the diff processor

API, not the open- and close-directory methods, and not reporting changes on

directories.

* subversion/include/svn_client.h

 (svn_client_shelf_export_patch): Deprecate.

* subversion/include/private/svn_client_private.h

 (svn_client__get_diff_writer_unidiff): New.

 (svn_client__shelf_diff): New.

* subversion/libsvn_client/diff.c

 (svn_client__get_diff_writer_unidiff): New.

* subversion/libsvn_client/shelf.c

 (file_changed, file_deleted, file_added): New.

 (diff_baton_t, diff_visitor): Drive a diff-processor from shelved changes.

 (svn_client__shelf_diff): New.

 (svn_client_shelf_export_patch): Delete the body; it is deprecated and did

   nothing before.

* subversion/svn/shelf-cmd.c

 (shelf_diff): First obtain a diff writer. Then call the shelf-diff API,

   driving that writer.

* subversion/tests/cmdline/shelf_tests.py

 (shelf_diff_simple): New test.

 (test_list): Run it.

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