Filter structure used to register custom filters.

To associate extra data with a filter, allocate extra data and put the git_filter struct at the start of your data buffer, then cast the self pointer to your larger structure when your callback is invoked.

version should be set to GIT_FILTER_VERSION

attributes is a whitespace-separated list of attribute names to check for this filter (e.g. "eol crlf text"). If the attribute name is bare, it will be simply loaded and passed to the check callback. If it has a value (i.e. "name=value"), the attribute must match that value for the filter to be applied.

The initialize, shutdown, check, apply, and cleanup callbacks are all documented above with the respective function pointer typedefs.