reflog-walk.c

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