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tag: v1.3.0-rc4
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#ifndef COMMIT_H
#define COMMIT_H

#include "object.h"
#include "tree.h"

struct commit_list {
struct commit *item;
struct commit_list *next;
};

struct commit {
struct object object;
unsigned long date;
struct commit_list *parents;
struct tree *tree;
char *buffer;
};

extern int save_commit_buffer;
extern const char *commit_type;

struct commit *lookup_commit(const unsigned char *sha1);
struct commit *lookup_commit_reference(const unsigned char *sha1);
struct commit *lookup_commit_reference_gently(const unsigned char *sha1,
int quiet);

int parse_commit_buffer(struct commit *item, void *buffer, unsigned long size);

int parse_commit(struct commit *item);

struct commit_list * commit_list_insert(struct commit *item, struct commit_list **list_p);
struct commit_list * insert_by_date(struct commit *item, struct commit_list **list);

void free_commit_list(struct commit_list *list);

void sort_by_date(struct commit_list **list);

/* Commit formats */
enum cmit_fmt {
CMIT_FMT_RAW,
CMIT_FMT_MEDIUM,
CMIT_FMT_DEFAULT = CMIT_FMT_MEDIUM,
CMIT_FMT_SHORT,
CMIT_FMT_FULL,
CMIT_FMT_FULLER,
CMIT_FMT_ONELINE,
};

extern enum cmit_fmt get_commit_format(const char *arg);
extern unsigned long pretty_print_commit(enum cmit_fmt fmt, const struct commit *, unsigned long len, char *buf, unsigned long space, int abbrev);

/** Removes the first commit from a list sorted by date, and adds all
* of its parents.
**/
struct commit *pop_most_recent_commit(struct commit_list **list,
unsigned int mark);

struct commit *pop_commit(struct commit_list **stack);

void clear_commit_marks(struct commit *commit, unsigned int mark);

int count_parents(struct commit * commit);

/*
* Performs an in-place topological sort of list supplied.
*
* Pre-conditions for sort_in_topological_order:
* all commits in input list and all parents of those
* commits must have object.util == NULL
*
* Pre-conditions for sort_in_topological_order_fn:
* all commits in input list and all parents of those
* commits must have getter(commit) == NULL
*
* Post-conditions:
* invariant of resulting list is:
* a reachable from b => ord(b) < ord(a)
* in addition, when lifo == 0, commits on parallel tracks are
* sorted in the dates order.
*/

typedef void (*topo_sort_set_fn_t)(struct commit*, void *data);
typedef void* (*topo_sort_get_fn_t)(struct commit*);

void topo_sort_default_setter(struct commit *c, void *data);
void *topo_sort_default_getter(struct commit *c);

void sort_in_topological_order(struct commit_list ** list, int lifo);
void sort_in_topological_order_fn(struct commit_list ** list, int lifo,
topo_sort_set_fn_t setter,
topo_sort_get_fn_t getter);

struct commit_graft {
unsigned char sha1[20];
int nr_parent;
unsigned char parent[FLEX_ARRAY][20]; /* more */
};

struct commit_graft *read_graft_line(char *buf, int len);
int register_commit_graft(struct commit_graft *, int);
int read_graft_file(const char *graft_file);

#endif /* COMMIT_H */
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