commit.h

   1 #ifndef COMMIT_H
   2 #define COMMIT_H
   3
   4 #include "object.h"
   5 #include "tree.h"
   6 #include "strbuf.h"
   7 #include "decorate.h"
   8 #include "gpg-interface.h"
   9 #include "string-list.h"
  10
  11 struct commit_list {
  12         struct commit *item;
  13         struct commit_list *next;
  14 };
  15
  16 struct commit {
  17         struct object object;
  18         void *util;
  19         unsigned int index;
  20         unsigned long date;
  21         struct commit_list *parents;
  22         struct tree *tree;
  23 };
  24
  25 extern int save_commit_buffer;
  26 extern const char *commit_type;
  27
  28 /* While we can decorate any object with a name, it's only used for commits.. */
  29 struct name_decoration {
  30         struct name_decoration *next;
  31         int type;
  32         char name[FLEX_ARRAY];
  33 };
  34
  35 enum decoration_type {
  36         DECORATION_NONE = 0,
  37         DECORATION_REF_LOCAL,
  38         DECORATION_REF_REMOTE,
  39         DECORATION_REF_TAG,
  40         DECORATION_REF_STASH,
  41         DECORATION_REF_HEAD,
  42         DECORATION_GRAFTED,
  43 };
  44
  45 void add_name_decoration(enum decoration_type type, const char *name, struct object *obj);
  46 const struct name_decoration *get_name_decoration(const struct object *obj);
  47
  48 struct commit *lookup_commit(const unsigned char *sha1);
  49 struct commit *lookup_commit_reference(const unsigned char *sha1);
  50 struct commit *lookup_commit_reference_gently(const unsigned char *sha1,
  51                                               int quiet);
  52 struct commit *lookup_commit_reference_by_name(const char *name);
  53
  54 /*
  55  * Look up object named by "sha1", dereference tag as necessary,
  56  * get a commit and return it. If "sha1" does not dereference to
  57  * a commit, use ref_name to report an error and die.
  58  */
  59 struct commit *lookup_commit_or_die(const unsigned char *sha1, const char *ref_name);
  60
  61 int parse_commit_buffer(struct commit *item, const void *buffer, unsigned long size);
  62 int parse_commit(struct commit *item);
  63 void parse_commit_or_die(struct commit *item);
  64
  65 /*
  66  * Associate an object buffer with the commit. The ownership of the
  67  * memory is handed over to the commit, and must be free()-able.
  68  */
  69 void set_commit_buffer(struct commit *, void *buffer, unsigned long size);
  70
  71 /*
  72  * Get any cached object buffer associated with the commit. Returns NULL
  73  * if none. The resulting memory should not be freed.
  74  */
  75 const void *get_cached_commit_buffer(const struct commit *, unsigned long *size);
  76
  77 /*
  78  * Get the commit's object contents, either from cache or by reading the object
  79  * from disk. The resulting memory should not be modified, and must be given
  80  * to unuse_commit_buffer when the caller is done.
  81  */
  82 const void *get_commit_buffer(const struct commit *, unsigned long *size);
  83
  84 /*
  85  * Tell the commit subsytem that we are done with a particular commit buffer.
  86  * The commit and buffer should be the input and return value, respectively,
  87  * from an earlier call to get_commit_buffer.  The buffer may or may not be
  88  * freed by this call; callers should not access the memory afterwards.
  89  */
  90 void unuse_commit_buffer(const struct commit *, const void *buffer);
  91
  92 /*
  93  * Free any cached object buffer associated with the commit.
  94  */
  95 void free_commit_buffer(struct commit *);
  96
  97 /*
  98  * Disassociate any cached object buffer from the commit, but do not free it.
  99  * The buffer (or NULL, if none) is returned.
 100  */
 101 const void *detach_commit_buffer(struct commit *, unsigned long *sizep);
 102
 103 /* Find beginning and length of commit subject. */
 104 int find_commit_subject(const char *commit_buffer, const char **subject);
 105
 106 struct commit_list *commit_list_insert(struct commit *item,
 107                                         struct commit_list **list);
 108 struct commit_list **commit_list_append(struct commit *commit,
 109                                         struct commit_list **next);
 110 unsigned commit_list_count(const struct commit_list *l);
 111 struct commit_list *commit_list_insert_by_date(struct commit *item,
 112                                     struct commit_list **list);
 113 void commit_list_sort_by_date(struct commit_list **list);
 114
 115 /* Shallow copy of the input list */
 116 struct commit_list *copy_commit_list(struct commit_list *list);
 117
 118 void free_commit_list(struct commit_list *list);
 119
 120 /* Commit formats */
 121 enum cmit_fmt {
 122         CMIT_FMT_RAW,
 123         CMIT_FMT_MEDIUM,
 124         CMIT_FMT_DEFAULT = CMIT_FMT_MEDIUM,
 125         CMIT_FMT_SHORT,
 126         CMIT_FMT_FULL,
 127         CMIT_FMT_FULLER,
 128         CMIT_FMT_ONELINE,
 129         CMIT_FMT_EMAIL,
 130         CMIT_FMT_USERFORMAT,
 131
 132         CMIT_FMT_UNSPECIFIED
 133 };
 134
 135 struct pretty_print_context {
 136         /*
 137          * Callers should tweak these to change the behavior of pp_* functions.
 138          */
 139         enum cmit_fmt fmt;
 140         int abbrev;
 141         const char *subject;
 142         const char *after_subject;
 143         int preserve_subject;
 144         enum date_mode date_mode;
 145         unsigned date_mode_explicit:1;
 146         int need_8bit_cte;
 147         char *notes_message;
 148         struct reflog_walk_info *reflog_info;
 149         const char *output_encoding;
 150         struct string_list *mailmap;
 151         int color;
 152         struct ident_split *from_ident;
 153
 154         /*
 155          * Fields below here are manipulated internally by pp_* functions and
 156          * should not be counted on by callers.
 157          */
 158         struct string_list in_body_headers;
 159 };
 160
 161 struct userformat_want {
 162         unsigned notes:1;
 163 };
 164
 165 extern int has_non_ascii(const char *text);
 166 struct rev_info; /* in revision.h, it circularly uses enum cmit_fmt */
 167 extern const char *logmsg_reencode(const struct commit *commit,
 168                                    char **commit_encoding,
 169                                    const char *output_encoding);
 170 extern void get_commit_format(const char *arg, struct rev_info *);
 171 extern const char *format_subject(struct strbuf *sb, const char *msg,
 172                                   const char *line_separator);
 173 extern void userformat_find_requirements(const char *fmt, struct userformat_want *w);
 174 extern int commit_format_is_empty(enum cmit_fmt);
 175 extern void format_commit_message(const struct commit *commit,
 176                                   const char *format, struct strbuf *sb,
 177                                   const struct pretty_print_context *context);
 178 extern void pretty_print_commit(struct pretty_print_context *pp,
 179                                 const struct commit *commit,
 180                                 struct strbuf *sb);
 181 extern void pp_commit_easy(enum cmit_fmt fmt, const struct commit *commit,
 182                            struct strbuf *sb);
 183 void pp_user_info(struct pretty_print_context *pp,
 184                   const char *what, struct strbuf *sb,
 185                   const char *line, const char *encoding);
 186 void pp_title_line(struct pretty_print_context *pp,
 187                    const char **msg_p,
 188                    struct strbuf *sb,
 189                    const char *encoding,
 190                    int need_8bit_cte);
 191 void pp_remainder(struct pretty_print_context *pp,
 192                   const char **msg_p,
 193                   struct strbuf *sb,
 194                   int indent);
 195
 196
 197 /** Removes the first commit from a list sorted by date, and adds all
 198  * of its parents.
 199  **/
 200 struct commit *pop_most_recent_commit(struct commit_list **list,
 201                                       unsigned int mark);
 202
 203 struct commit *pop_commit(struct commit_list **stack);
 204
 205 void clear_commit_marks(struct commit *commit, unsigned int mark);
 206 void clear_commit_marks_many(int nr, struct commit **commit, unsigned int mark);
 207 void clear_commit_marks_for_object_array(struct object_array *a, unsigned mark);
 208
 209
 210 enum rev_sort_order {
 211         REV_SORT_IN_GRAPH_ORDER = 0,
 212         REV_SORT_BY_COMMIT_DATE,
 213         REV_SORT_BY_AUTHOR_DATE
 214 };
 215
 216 /*
 217  * Performs an in-place topological sort of list supplied.
 218  *
 219  *   invariant of resulting list is:
 220  *      a reachable from b => ord(b) < ord(a)
 221  *   sort_order further specifies:
 222  *   REV_SORT_IN_GRAPH_ORDER: try to show a commit on a single-parent
 223  *                            chain together.
 224  *   REV_SORT_BY_COMMIT_DATE: show eligible commits in committer-date order.
 225  */
 226 void sort_in_topological_order(struct commit_list **, enum rev_sort_order);
 227
 228 struct commit_graft {
 229         unsigned char sha1[20];
 230         int nr_parent; /* < 0 if shallow commit */
 231         unsigned char parent[FLEX_ARRAY][20]; /* more */
 232 };
 233 typedef int (*each_commit_graft_fn)(const struct commit_graft *, void *);
 234
 235 struct commit_graft *read_graft_line(char *buf, int len);
 236 int register_commit_graft(struct commit_graft *, int);
 237 struct commit_graft *lookup_commit_graft(const unsigned char *sha1);
 238
 239 extern struct commit_list *get_merge_bases(struct commit *rev1, struct commit *rev2);
 240 extern struct commit_list *get_merge_bases_many(struct commit *one, int n, struct commit **twos);
 241 extern struct commit_list *get_octopus_merge_bases(struct commit_list *in);
 242
 243 /* To be used only when object flags after this call no longer matter */
 244 extern struct commit_list *get_merge_bases_many_dirty(struct commit *one, int n, struct commit **twos);
 245
 246 /* largest positive number a signed 32-bit integer can contain */
 247 #define INFINITE_DEPTH 0x7fffffff
 248
 249 struct sha1_array;
 250 struct ref;
 251 extern int register_shallow(const unsigned char *sha1);
 252 extern int unregister_shallow(const unsigned char *sha1);
 253 extern int for_each_commit_graft(each_commit_graft_fn, void *);
 254 extern int is_repository_shallow(void);
 255 extern struct commit_list *get_shallow_commits(struct object_array *heads,
 256                 int depth, int shallow_flag, int not_shallow_flag);
 257 extern void check_shallow_file_for_update(void);
 258 extern void set_alternate_shallow_file(const char *path, int override);
 259 extern int write_shallow_commits(struct strbuf *out, int use_pack_protocol,
 260                                  const struct sha1_array *extra);
 261 extern void setup_alternate_shallow(struct lock_file *shallow_lock,
 262                                     const char **alternate_shallow_file,
 263                                     const struct sha1_array *extra);
 264 extern const char *setup_temporary_shallow(const struct sha1_array *extra);
 265 extern void advertise_shallow_grafts(int);
 266
 267 struct shallow_info {
 268         struct sha1_array *shallow;
 269         int *ours, nr_ours;
 270         int *theirs, nr_theirs;
 271         struct sha1_array *ref;
 272
 273         /* for receive-pack */
 274         uint32_t **used_shallow;
 275         int *need_reachability_test;
 276         int *reachable;
 277         int *shallow_ref;
 278         struct commit **commits;
 279         int nr_commits;
 280 };
 281
 282 extern void prepare_shallow_info(struct shallow_info *, struct sha1_array *);
 283 extern void clear_shallow_info(struct shallow_info *);
 284 extern void remove_nonexistent_theirs_shallow(struct shallow_info *);
 285 extern void assign_shallow_commits_to_refs(struct shallow_info *info,
 286                                            uint32_t **used,
 287                                            int *ref_status);
 288 extern int delayed_reachability_test(struct shallow_info *si, int c);
 289 extern void prune_shallow(int show_only);
 290 extern struct trace_key trace_shallow;
 291
 292 int is_descendant_of(struct commit *, struct commit_list *);
 293 int in_merge_bases(struct commit *, struct commit *);
 294 int in_merge_bases_many(struct commit *, int, struct commit **);
 295
 296 extern int interactive_add(int argc, const char **argv, const char *prefix, int patch);
 297 extern int run_add_interactive(const char *revision, const char *patch_mode,
 298                                const struct pathspec *pathspec);
 299
 300 static inline int single_parent(struct commit *commit)
 301 {
 302         return commit->parents && !commit->parents->next;
 303 }
 304
 305 struct commit_list *reduce_heads(struct commit_list *heads);
 306
 307 struct commit_extra_header {
 308         struct commit_extra_header *next;
 309         char *key;
 310         char *value;
 311         size_t len;
 312 };
 313
 314 extern void append_merge_tag_headers(struct commit_list *parents,
 315                                      struct commit_extra_header ***tail);
 316
 317 extern int commit_tree(const char *msg, size_t msg_len,
 318                        const unsigned char *tree,
 319                        struct commit_list *parents, unsigned char *ret,
 320                        const char *author, const char *sign_commit);
 321
 322 extern int commit_tree_extended(const char *msg, size_t msg_len,
 323                                 const unsigned char *tree,
 324                                 struct commit_list *parents, unsigned char *ret,
 325                                 const char *author, const char *sign_commit,
 326                                 struct commit_extra_header *);
 327
 328 extern struct commit_extra_header *read_commit_extra_headers(struct commit *, const char **);
 329
 330 extern void free_commit_extra_headers(struct commit_extra_header *extra);
 331
 332 /*
 333  * Search the commit object contents given by "msg" for the header "key".
 334  * Returns a pointer to the start of the header contents, or NULL. The length
 335  * of the header, up to the first newline, is returned via out_len.
 336  *
 337  * Note that some headers (like mergetag) may be multi-line. It is the caller's
 338  * responsibility to parse further in this case!
 339  */
 340 extern const char *find_commit_header(const char *msg, const char *key,
 341                                       size_t *out_len);
 342
 343 /* Find the end of the log message, the right place for a new trailer. */
 344 extern int ignore_non_trailer(struct strbuf *sb);
 345
 346 typedef void (*each_mergetag_fn)(struct commit *commit, struct commit_extra_header *extra,
 347                                  void *cb_data);
 348
 349 extern void for_each_mergetag(each_mergetag_fn fn, struct commit *commit, void *data);
 350
 351 struct merge_remote_desc {
 352         struct object *obj; /* the named object, could be a tag */
 353         const char *name;
 354 };
 355 #define merge_remote_util(commit) ((struct merge_remote_desc *)((commit)->util))
 356
 357 /*
 358  * Given "name" from the command line to merge, find the commit object
 359  * and return it, while storing merge_remote_desc in its ->util field,
 360  * to allow callers to tell if we are told to merge a tag.
 361  */
 362 struct commit *get_merge_parent(const char *name);
 363
 364 extern int parse_signed_commit(const struct commit *commit,
 365                                struct strbuf *message, struct strbuf *signature);
 366 extern int remove_signature(struct strbuf *buf);
 367
 368 extern void print_commit_list(struct commit_list *list,
 369                               const char *format_cur,
 370                               const char *format_last);
 371
 372 /*
 373  * Check the signature of the given commit. The result of the check is stored
 374  * in sig->check_result, 'G' for a good signature, 'U' for a good signature
 375  * from an untrusted signer, 'B' for a bad signature and 'N' for no signature
 376  * at all.  This may allocate memory for sig->gpg_output, sig->gpg_status,
 377  * sig->signer and sig->key.
 378  */
 379 extern void check_commit_signature(const struct commit *commit, struct signature_check *sigc);
 380
 381 int compare_commits_by_commit_date(const void *a_, const void *b_, void *unused);
 382
 383 LAST_ARG_MUST_BE_NULL
 384 extern int run_commit_hook(int editor_is_used, const char *index_file, const char *name, ...);
 385
 386 #endif /* COMMIT_H */