reflog-walk.c

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