#ifndef CST_UNDO_H
#define CST_UNDO_H

#include <stddef.h>

#ifdef __cplusplus
extern "C" {
#endif

/* Save rel (workspace-relative) once per (session, tag) before it changes.
 * A missing file is recorded as absent so undo deletes it again. */
int cst_undo_snapshot(const char *ws, const char *sid, const char *tag,
                      const char *rel);
/* Roll back the newest tag and drop it. report lists what happened. */
int cst_undo_restore_last(const char *ws, const char *sid, char *report,
                          size_t report_sz);
/* Number of turns that can be undone. */
int cst_undo_count(const char *ws, const char *sid);

#ifdef __cplusplus
}
#endif

#endif