reflog-walk.c

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