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#pragma once
#include <time.h>
#include "nvim/extmark_defs.h"
#include "nvim/mark_defs.h"
enum { UNDO_HASH_SIZE = 32, }; ///< Size in bytes of the hash used in the undo file.
typedef struct u_header u_header_T;
/// Structure to store info about the Visual area.
typedef struct {
pos_T vi_start; ///< start pos of last VIsual
pos_T vi_end; ///< end position of last VIsual
int vi_mode; ///< VIsual_mode of last VIsual
colnr_T vi_curswant; ///< MAXCOL from w_curswant
} visualinfo_T;
typedef struct u_entry u_entry_T;
struct u_entry {
u_entry_T *ue_next; ///< pointer to next entry in list
linenr_T ue_top; ///< number of line above undo block
linenr_T ue_bot; ///< number of line below undo block
linenr_T ue_lcount; ///< linecount when u_save called
char **ue_array; ///< array of lines in undo block
linenr_T ue_size; ///< number of lines in ue_array
#ifdef U_DEBUG
int ue_magic; ///< magic number to check allocation
#endif
};
struct u_header {
// The following have a pointer and a number. The number is used when reading
// the undo file in u_read_undo()
union {
u_header_T *ptr; ///< pointer to next undo header in list
int seq;
} uh_next;
union {
u_header_T *ptr; ///< pointer to previous header in list
int seq;
} uh_prev;
union {
u_header_T *ptr; ///< pointer to next header for alt. redo
int seq;
} uh_alt_next;
union {
u_header_T *ptr; ///< pointer to previous header for alt. redo
int seq;
} uh_alt_prev;
int uh_seq; ///< sequence number, higher == newer undo
int uh_walk; ///< used by undo_time()
u_entry_T *uh_entry; ///< pointer to first entry
u_entry_T *uh_getbot_entry; ///< pointer to where ue_bot must be set
pos_T uh_cursor; ///< cursor position before saving
colnr_T uh_cursor_vcol;
int uh_flags; ///< see below
fmark_T uh_namedm[NMARKS]; ///< marks before undo/after redo
extmark_undo_vec_t uh_extmark; ///< info to move extmarks
visualinfo_T uh_visual; ///< Visual areas before undo/after redo
time_t uh_time; ///< timestamp when the change was made
int uh_save_nr; ///< set when the file was saved after the
///< changes in this block
#ifdef U_DEBUG
int uh_magic; ///< magic number to check allocation
#endif
};
/// values for uh_flags
enum {
UH_CHANGED = 0x01, ///< b_changed flag before undo/after redo
UH_EMPTYBUF = 0x02, ///< buffer was empty
UH_RELOAD = 0x04, ///< buffer was reloaded
};
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