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#ifndef LIST_OBJECTS_FILTER_H
#define LIST_OBJECTS_FILTER_H
struct list_objects_filter_options;
struct object;
struct oidset;
struct repository;
/*
* During list-object traversal we allow certain objects to be
* filtered (omitted) from the result. The active filter uses
* these result values to guide list-objects.
*
* _ZERO : Do nothing with the object at this time. It may
* be revisited if it appears in another place in
* the tree or in another commit during the overall
* traversal.
*
* _MARK_SEEN : Mark this object as "SEEN" in the object flags.
* This will prevent it from being revisited during
* the remainder of the traversal. This DOES NOT
* imply that it will be included in the results.
*
* _DO_SHOW : Show this object in the results (call show() on it).
* In general, objects should only be shown once, but
* this result DOES NOT imply that we mark it SEEN.
*
* _SKIP_TREE : Used in LOFS_BEGIN_TREE situation - indicates that
* the tree's children should not be iterated over. This
* is used as an optimization when all children will
* definitely be ignored.
*
* Most of the time, you want the combination (_MARK_SEEN | _DO_SHOW)
* but they can be used independently, such as when sparse-checkout
* pattern matching is being applied.
*
* A _MARK_SEEN without _DO_SHOW can be called a hard-omit -- the
* object is not shown and will never be reconsidered (unless a
* previous iteration has already shown it).
*
* A _DO_SHOW without _MARK_SEEN can be used, for example, to
* include a directory, but then revisit it to selectively include
* or omit objects within it.
*
* A _ZERO can be called a provisional-omit -- the object is NOT shown,
* but *may* be revisited (if the object appears again in the traversal).
* Therefore, it will be omitted from the results *unless* a later
* iteration causes it to be shown.
*/
enum list_objects_filter_result {
LOFR_ZERO = 0,
LOFR_MARK_SEEN = 1<<0,
LOFR_DO_SHOW = 1<<1,
LOFR_SKIP_TREE = 1<<2,
};
enum list_objects_filter_situation {
LOFS_BEGIN_TREE,
LOFS_END_TREE,
LOFS_BLOB
};
typedef enum list_objects_filter_result (*filter_object_fn)(
struct repository *r,
enum list_objects_filter_situation filter_situation,
struct object *obj,
const char *pathname,
const char *filename,
void *filter_data);
typedef void (*filter_free_fn)(void *filter_data);
/*
* Constructor for the set of defined list-objects filters.
* Returns a generic "void *filter_data".
*
* The returned "filter_fn" will be used by traverse_commit_list()
* to filter the results.
*
* The returned "filter_free_fn" is a destructor for the
* filter_data.
*/
void *list_objects_filter__init(
struct oidset *omitted,
struct list_objects_filter_options *filter_options,
filter_object_fn *filter_fn,
filter_free_fn *filter_free_fn);
#endif /* LIST_OBJECTS_FILTER_H */
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