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.
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 value may be a wildcard (eg, "name=*"), in which case the filter will be invoked for any value for the given attribute name. See the attribute parameter of the check callback for the attribute value that was specified.
Called to determine whether the filter should be invoked for a given file. If this function returns GIT_PASSTHROUGH then the stream or apply functions will not be invoked and the contents will be passed through unmodified.
Provided for backward compatibility; this will apply the filter to the given contents in a git_buf. Callers should provide a stream function instead.
Called to apply the filter, this function will provide a git_writestream that will the original data will be written to; with that data, the git_writestream will then perform the filter translation and stream the filtered data out to the next location.