reflog-walk.c

   1 #define USE_THE_REPOSITORY_VARIABLE
   2
   3 #include "git-compat-util.h"
   4 #include "commit.h"
   5 #include "refs.h"
   6 #include "diff.h"
   7 #include "repository.h"
   8 #include "revision.h"
   9 #include "string-list.h"
  10 #include "reflog-walk.h"
  11
  12 struct complete_reflogs {
  13         char *ref;
  14         char *short_ref;
  15         struct reflog_info {
  16                 struct object_id ooid, noid;
  17                 char *email;
  18                 timestamp_t timestamp;
  19                 int tz;
  20                 char *message;
  21         } *items;
  22         int nr, alloc;
  23 };
  24
  25 static int read_one_reflog(struct object_id *ooid, struct object_id *noid,
  26                 const char *email, timestamp_t timestamp, int tz,
  27                 const char *message, void *cb_data)
  28 {
  29         struct complete_reflogs *array = cb_data;
  30         struct reflog_info *item;
  31
  32         ALLOC_GROW(array->items, array->nr + 1, array->alloc);
  33         item = array->items + array->nr;
  34         oidcpy(&item->ooid, ooid);
  35         oidcpy(&item->noid, noid);
  36         item->email = xstrdup(email);
  37         item->timestamp = timestamp;
  38         item->tz = tz;
  39         item->message = xstrdup(message);
  40         array->nr++;
  41         return 0;
  42 }
  43
  44 static void free_complete_reflog(struct complete_reflogs *array)
  45 {
  46         int i;
  47
  48         if (!array)
  49                 return;
  50
  51         for (i = 0; i < array->nr; i++) {
  52                 free(array->items[i].email);
  53                 free(array->items[i].message);
  54         }
  55         free(array->items);
  56         free(array->ref);
  57         free(array->short_ref);
  58         free(array);
  59 }
  60
  61 static void complete_reflogs_clear(void *util, const char *str UNUSED)
  62 {
  63         struct complete_reflogs *array = util;
  64         free_complete_reflog(array);
  65 }
  66
  67 static struct complete_reflogs *read_complete_reflog(const char *ref)
  68 {
  69         struct complete_reflogs *reflogs =
  70                 xcalloc(1, sizeof(struct complete_reflogs));
  71         reflogs->ref = xstrdup(ref);
  72         refs_for_each_reflog_ent(get_main_ref_store(the_repository), ref,
  73                                  read_one_reflog, reflogs);
  74         if (reflogs->nr == 0) {
  75                 const char *name;
  76                 void *name_to_free;
  77                 name = name_to_free = refs_resolve_refdup(get_main_ref_store(the_repository),
  78                                                           ref,
  79                                                           RESOLVE_REF_READING,
  80                                                           NULL, NULL);
  81                 if (name) {
  82                         refs_for_each_reflog_ent(get_main_ref_store(the_repository),
  83                                                  name, read_one_reflog,
  84                                                  reflogs);
  85                         free(name_to_free);
  86                 }
  87         }
  88         if (reflogs->nr == 0) {
  89                 char *refname = xstrfmt("refs/%s", ref);
  90                 refs_for_each_reflog_ent(get_main_ref_store(the_repository),
  91                                          refname, read_one_reflog, reflogs);
  92                 if (reflogs->nr == 0) {
  93                         free(refname);
  94                         refname = xstrfmt("refs/heads/%s", ref);
  95                         refs_for_each_reflog_ent(get_main_ref_store(the_repository),
  96                                                  refname, read_one_reflog,
  97                                                  reflogs);
  98                 }
  99                 free(refname);
 100         }
 101         return reflogs;
 102 }
 103
 104 static int get_reflog_recno_by_time(struct complete_reflogs *array,
 105         timestamp_t timestamp)
 106 {
 107         int i;
 108         for (i = array->nr - 1; i >= 0; i--)
 109                 if (timestamp >= array->items[i].timestamp)
 110                         return i;
 111         return -1;
 112 }
 113
 114 struct commit_reflog {
 115         int recno;
 116         enum selector_type {
 117                 SELECTOR_NONE,
 118                 SELECTOR_INDEX,
 119                 SELECTOR_DATE
 120         } selector;
 121         struct complete_reflogs *reflogs;
 122 };
 123
 124 struct reflog_walk_info {
 125         struct commit_reflog **logs;
 126         size_t nr, alloc;
 127         struct string_list complete_reflogs;
 128         struct commit_reflog *last_commit_reflog;
 129 };
 130
 131 void init_reflog_walk(struct reflog_walk_info **info)
 132 {
 133         CALLOC_ARRAY(*info, 1);
 134         (*info)->complete_reflogs.strdup_strings = 1;
 135 }
 136
 137 void reflog_walk_info_release(struct reflog_walk_info *info)
 138 {
 139         size_t i;
 140
 141         if (!info)
 142                 return;
 143
 144         for (i = 0; i < info->nr; i++)
 145                 free(info->logs[i]);
 146         string_list_clear_func(&info->complete_reflogs,
 147                                complete_reflogs_clear);
 148         free(info->logs);
 149         free(info);
 150 }
 151
 152 int add_reflog_for_walk(struct reflog_walk_info *info,
 153                 struct commit *commit, const char *name)
 154 {
 155         timestamp_t timestamp = 0;
 156         int recno = -1;
 157         struct string_list_item *item;
 158         struct complete_reflogs *reflogs;
 159         char *branch, *at = strchr(name, '@');
 160         struct commit_reflog *commit_reflog;
 161         enum selector_type selector = SELECTOR_NONE;
 162
 163         if (commit->object.flags & UNINTERESTING)
 164                 die("cannot walk reflogs for %s", name);
 165
 166         branch = xstrdup(name);
 167         if (at && at[1] == '{') {
 168                 char *ep;
 169                 branch[at - name] = '\0';
 170                 recno = strtoul(at + 2, &ep, 10);
 171                 if (*ep != '}') {
 172                         recno = -1;
 173                         timestamp = approxidate(at + 2);
 174                         selector = SELECTOR_DATE;
 175                 }
 176                 else
 177                         selector = SELECTOR_INDEX;
 178         } else
 179                 recno = 0;
 180
 181         item = string_list_lookup(&info->complete_reflogs, branch);
 182         if (item)
 183                 reflogs = item->util;
 184         else {
 185                 if (*branch == '\0') {
 186                         free(branch);
 187                         branch = refs_resolve_refdup(get_main_ref_store(the_repository),
 188                                                      "HEAD", 0, NULL, NULL);
 189                         if (!branch)
 190                                 die("no current branch");
 191
 192                 }
 193                 reflogs = read_complete_reflog(branch);
 194                 if (!reflogs || reflogs->nr == 0) {
 195                         char *b;
 196                         int ret = repo_dwim_log(the_repository, branch, strlen(branch),
 197                                                 NULL, &b);
 198                         if (ret > 1)
 199                                 free(b);
 200                         else if (ret == 1) {
 201                                 free_complete_reflog(reflogs);
 202                                 free(branch);
 203                                 branch = b;
 204                                 reflogs = read_complete_reflog(branch);
 205                         }
 206                 }
 207                 if (!reflogs || reflogs->nr == 0) {
 208                         free_complete_reflog(reflogs);
 209                         free(branch);
 210                         return -1;
 211                 }
 212                 string_list_insert(&info->complete_reflogs, branch)->util
 213                         = reflogs;
 214         }
 215         free(branch);
 216
 217         CALLOC_ARRAY(commit_reflog, 1);
 218         if (recno < 0) {
 219                 commit_reflog->recno = get_reflog_recno_by_time(reflogs, timestamp);
 220                 if (commit_reflog->recno < 0) {
 221                         free(commit_reflog);
 222                         return -1;
 223                 }
 224         } else
 225                 commit_reflog->recno = reflogs->nr - recno - 1;
 226         commit_reflog->selector = selector;
 227         commit_reflog->reflogs = reflogs;
 228
 229         ALLOC_GROW(info->logs, info->nr + 1, info->alloc);
 230         info->logs[info->nr++] = commit_reflog;
 231
 232         return 0;
 233 }
 234
 235 void get_reflog_selector(struct strbuf *sb,
 236                          struct reflog_walk_info *reflog_info,
 237                          struct date_mode dmode, int force_date,
 238                          int shorten)
 239 {
 240         struct commit_reflog *commit_reflog = reflog_info->last_commit_reflog;
 241         struct reflog_info *info;
 242         const char *printed_ref;
 243
 244         if (!commit_reflog)
 245                 return;
 246
 247         if (shorten) {
 248                 if (!commit_reflog->reflogs->short_ref)
 249                         commit_reflog->reflogs->short_ref
 250                                 = refs_shorten_unambiguous_ref(get_main_ref_store(the_repository),
 251                                                                commit_reflog->reflogs->ref,
 252                                                                0);
 253                 printed_ref = commit_reflog->reflogs->short_ref;
 254         } else {
 255                 printed_ref = commit_reflog->reflogs->ref;
 256         }
 257
 258         strbuf_addf(sb, "%s@{", printed_ref);
 259         if (commit_reflog->selector == SELECTOR_DATE ||
 260             (commit_reflog->selector == SELECTOR_NONE && force_date)) {
 261                 info = &commit_reflog->reflogs->items[commit_reflog->recno+1];
 262                 strbuf_addstr(sb, show_date(info->timestamp, info->tz, dmode));
 263         } else {
 264                 strbuf_addf(sb, "%d", commit_reflog->reflogs->nr
 265                             - 2 - commit_reflog->recno);
 266         }
 267
 268         strbuf_addch(sb, '}');
 269 }
 270
 271 void get_reflog_message(struct strbuf *sb,
 272                         struct reflog_walk_info *reflog_info)
 273 {
 274         struct commit_reflog *commit_reflog = reflog_info->last_commit_reflog;
 275         struct reflog_info *info;
 276         size_t len;
 277
 278         if (!commit_reflog)
 279                 return;
 280
 281         info = &commit_reflog->reflogs->items[commit_reflog->recno+1];
 282         len = strlen(info->message);
 283         if (len > 0)
 284                 len--; /* strip away trailing newline */
 285         strbuf_add(sb, info->message, len);
 286 }
 287
 288 const char *get_reflog_ident(struct reflog_walk_info *reflog_info)
 289 {
 290         struct commit_reflog *commit_reflog = reflog_info->last_commit_reflog;
 291         struct reflog_info *info;
 292
 293         if (!commit_reflog)
 294                 return NULL;
 295
 296         info = &commit_reflog->reflogs->items[commit_reflog->recno+1];
 297         return info->email;
 298 }
 299
 300 timestamp_t get_reflog_timestamp(struct reflog_walk_info *reflog_info)
 301 {
 302         struct commit_reflog *commit_reflog = reflog_info->last_commit_reflog;
 303         struct reflog_info *info;
 304
 305         if (!commit_reflog)
 306                 return 0;
 307
 308         info = &commit_reflog->reflogs->items[commit_reflog->recno+1];
 309         return info->timestamp;
 310 }
 311
 312 void show_reflog_message(struct reflog_walk_info *reflog_info, int oneline,
 313                          struct date_mode dmode, int force_date)
 314 {
 315         if (reflog_info && reflog_info->last_commit_reflog) {
 316                 struct commit_reflog *commit_reflog = reflog_info->last_commit_reflog;
 317                 struct reflog_info *info;
 318                 struct strbuf selector = STRBUF_INIT;
 319
 320                 info = &commit_reflog->reflogs->items[commit_reflog->recno+1];
 321                 get_reflog_selector(&selector, reflog_info, dmode, force_date, 0);
 322                 if (oneline) {
 323                         printf("%s: %s", selector.buf, info->message);
 324                 }
 325                 else {
 326                         printf("Reflog: %s (%s)\nReflog message: %s",
 327                                selector.buf, info->email, info->message);
 328                 }
 329
 330                 strbuf_release(&selector);
 331         }
 332 }
 333
 334 int reflog_walk_empty(struct reflog_walk_info *info)
 335 {
 336         return !info || !info->nr;
 337 }
 338
 339 static struct commit *next_reflog_commit(struct commit_reflog *log)
 340 {
 341         for (; log->recno >= 0; log->recno--) {
 342                 struct reflog_info *entry = &log->reflogs->items[log->recno];
 343                 struct object *obj = parse_object(the_repository,
 344                                                   &entry->noid);
 345
 346                 if (obj && obj->type == OBJ_COMMIT)
 347                         return (struct commit *)obj;
 348         }
 349         return NULL;
 350 }
 351
 352 static timestamp_t log_timestamp(struct commit_reflog *log)
 353 {
 354         return log->reflogs->items[log->recno].timestamp;
 355 }
 356
 357 struct commit *next_reflog_entry(struct reflog_walk_info *walk)
 358 {
 359         struct commit_reflog *best = NULL;
 360         struct commit *best_commit = NULL;
 361         size_t i;
 362
 363         for (i = 0; i < walk->nr; i++) {
 364                 struct commit_reflog *log = walk->logs[i];
 365                 struct commit *commit = next_reflog_commit(log);
 366
 367                 if (!commit)
 368                         continue;
 369
 370                 if (!best || log_timestamp(log) > log_timestamp(best)) {
 371                         best = log;
 372                         best_commit = commit;
 373                 }
 374         }
 375
 376         if (best) {
 377                 best->recno--;
 378                 walk->last_commit_reflog = best;
 379                 return best_commit;
 380         }
 381
 382         return NULL;
 383 }