The svn_stream_set_line_filter_callback() and
svn_stream_set_line_transformer_callback() and associated API changes made for
v1.7 should be removed. The main problem is they are architecturally wrong.
Filtering is one of the basic uses for streams. For any filtering task with
streams - including compression, modification, etc. - the good solution is to
define a wrapper stream that does the job, not add special callbacks to the
generic stream template.
The readline() function is not a generic stream method, just a helper function,
and we should not have defined callbacks in the stream that are used only by a
helper function. The line_*_callback() functions were a sort of poor-man's
substitute for a virtual readline() method.
A couple of possible solutions are:
* have the user implement the required filtering as a wrapper stream;
* make readline() a virtual method of svn_stream_t and then have the user
provide replacement implementations of readline() for doing the required filtering.
Task
Major