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         const 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);
  55 }
  56
  57 static struct complete_reflogs *read_complete_reflog(const char *ref)
  58 {
  59         struct complete_reflogs *reflogs =
  60                 xcalloc(1, sizeof(struct complete_reflogs));
  61         reflogs->ref = xstrdup(ref);
  62         for_each_reflog_ent(ref, read_one_reflog, reflogs);
  63         if (reflogs->nr == 0) {
  64                 const char *name;
  65                 void *name_to_free;
  66                 name = name_to_free = resolve_refdup(ref, RESOLVE_REF_READING,
  67                                                      NULL, NULL);
  68                 if (name) {
  69                         for_each_reflog_ent(name, read_one_reflog, reflogs);
  70                         free(name_to_free);
  71                 }
  72         }
  73         if (reflogs->nr == 0) {
  74                 char *refname = xstrfmt("refs/%s", ref);
  75                 for_each_reflog_ent(refname, read_one_reflog, reflogs);
  76                 if (reflogs->nr == 0) {
  77                         free(refname);
  78                         refname = xstrfmt("refs/heads/%s", ref);
  79                         for_each_reflog_ent(refname, read_one_reflog, reflogs);
  80                 }
  81                 free(refname);
  82         }
  83         return reflogs;
  84 }
  85
  86 static int get_reflog_recno_by_time(struct complete_reflogs *array,
  87         timestamp_t timestamp)
  88 {
  89         int i;
  90         for (i = array->nr - 1; i >= 0; i--)
  91                 if (timestamp >= array->items[i].timestamp)
  92                         return i;
  93         return -1;
  94 }
  95
  96 struct commit_reflog {
  97         int recno;
  98         enum selector_type {
  99                 SELECTOR_NONE,
 100                 SELECTOR_INDEX,
 101                 SELECTOR_DATE
 102         } selector;
 103         struct complete_reflogs *reflogs;
 104 };
 105
 106 struct reflog_walk_info {
 107         struct commit_reflog **logs;
 108         size_t nr, alloc;
 109         struct string_list complete_reflogs;
 110         struct commit_reflog *last_commit_reflog;
 111 };
 112
 113 void init_reflog_walk(struct reflog_walk_info **info)
 114 {
 115         *info = xcalloc(1, sizeof(struct reflog_walk_info));
 116         (*info)->complete_reflogs.strdup_strings = 1;
 117 }
 118
 119 int add_reflog_for_walk(struct reflog_walk_info *info,
 120                 struct commit *commit, const char *name)
 121 {
 122         timestamp_t timestamp = 0;
 123         int recno = -1;
 124         struct string_list_item *item;
 125         struct complete_reflogs *reflogs;
 126         char *branch, *at = strchr(name, '@');
 127         struct commit_reflog *commit_reflog;
 128         enum selector_type selector = SELECTOR_NONE;
 129
 130         if (commit->object.flags & UNINTERESTING)
 131                 die ("Cannot walk reflogs for %s", name);
 132
 133         branch = xstrdup(name);
 134         if (at && at[1] == '{') {
 135                 char *ep;
 136                 branch[at - name] = '\0';
 137                 recno = strtoul(at + 2, &ep, 10);
 138                 if (*ep != '}') {
 139                         recno = -1;
 140                         timestamp = approxidate(at + 2);
 141                         selector = SELECTOR_DATE;
 142                 }
 143                 else
 144                         selector = SELECTOR_INDEX;
 145         } else
 146                 recno = 0;
 147
 148         item = string_list_lookup(&info->complete_reflogs, branch);
 149         if (item)
 150                 reflogs = item->util;
 151         else {
 152                 if (*branch == '\0') {
 153                         free(branch);
 154                         branch = resolve_refdup("HEAD", 0, NULL, NULL);
 155                         if (!branch)
 156                                 die ("No current branch");
 157
 158                 }
 159                 reflogs = read_complete_reflog(branch);
 160                 if (!reflogs || reflogs->nr == 0) {
 161                         struct object_id oid;
 162                         char *b;
 163                         int ret = dwim_log(branch, strlen(branch),
 164                                            &oid, &b);
 165                         if (ret > 1)
 166                                 free(b);
 167                         else if (ret == 1) {
 168                                 free_complete_reflog(reflogs);
 169                                 free(branch);
 170                                 branch = b;
 171                                 reflogs = read_complete_reflog(branch);
 172                         }
 173                 }
 174                 if (!reflogs || reflogs->nr == 0) {
 175                         free_complete_reflog(reflogs);
 176                         free(branch);
 177                         return -1;
 178                 }
 179                 string_list_insert(&info->complete_reflogs, branch)->util
 180                         = reflogs;
 181         }
 182         free(branch);
 183
 184         commit_reflog = xcalloc(1, sizeof(struct commit_reflog));
 185         if (recno < 0) {
 186                 commit_reflog->recno = get_reflog_recno_by_time(reflogs, timestamp);
 187                 if (commit_reflog->recno < 0) {
 188                         free(commit_reflog);
 189                         return -1;
 190                 }
 191         } else
 192                 commit_reflog->recno = reflogs->nr - recno - 1;
 193         commit_reflog->selector = selector;
 194         commit_reflog->reflogs = reflogs;
 195
 196         ALLOC_GROW(info->logs, info->nr + 1, info->alloc);
 197         info->logs[info->nr++] = commit_reflog;
 198
 199         return 0;
 200 }
 201
 202 void get_reflog_selector(struct strbuf *sb,
 203                          struct reflog_walk_info *reflog_info,
 204                          const struct date_mode *dmode, int force_date,
 205                          int shorten)
 206 {
 207         struct commit_reflog *commit_reflog = reflog_info->last_commit_reflog;
 208         struct reflog_info *info;
 209         const char *printed_ref;
 210
 211         if (!commit_reflog)
 212                 return;
 213
 214         if (shorten) {
 215                 if (!commit_reflog->reflogs->short_ref)
 216                         commit_reflog->reflogs->short_ref
 217                                 = shorten_unambiguous_ref(commit_reflog->reflogs->ref, 0);
 218                 printed_ref = commit_reflog->reflogs->short_ref;
 219         } else {
 220                 printed_ref = commit_reflog->reflogs->ref;
 221         }
 222
 223         strbuf_addf(sb, "%s@{", printed_ref);
 224         if (commit_reflog->selector == SELECTOR_DATE ||
 225             (commit_reflog->selector == SELECTOR_NONE && force_date)) {
 226                 info = &commit_reflog->reflogs->items[commit_reflog->recno+1];
 227                 strbuf_addstr(sb, show_date(info->timestamp, info->tz, dmode));
 228         } else {
 229                 strbuf_addf(sb, "%d", commit_reflog->reflogs->nr
 230                             - 2 - commit_reflog->recno);
 231         }
 232
 233         strbuf_addch(sb, '}');
 234 }
 235
 236 void get_reflog_message(struct strbuf *sb,
 237                         struct reflog_walk_info *reflog_info)
 238 {
 239         struct commit_reflog *commit_reflog = reflog_info->last_commit_reflog;
 240         struct reflog_info *info;
 241         size_t len;
 242
 243         if (!commit_reflog)
 244                 return;
 245
 246         info = &commit_reflog->reflogs->items[commit_reflog->recno+1];
 247         len = strlen(info->message);
 248         if (len > 0)
 249                 len--; /* strip away trailing newline */
 250         strbuf_add(sb, info->message, len);
 251 }
 252
 253 const char *get_reflog_ident(struct reflog_walk_info *reflog_info)
 254 {
 255         struct commit_reflog *commit_reflog = reflog_info->last_commit_reflog;
 256         struct reflog_info *info;
 257
 258         if (!commit_reflog)
 259                 return NULL;
 260
 261         info = &commit_reflog->reflogs->items[commit_reflog->recno+1];
 262         return info->email;
 263 }
 264
 265 timestamp_t get_reflog_timestamp(struct reflog_walk_info *reflog_info)
 266 {
 267         struct commit_reflog *commit_reflog = reflog_info->last_commit_reflog;
 268         struct reflog_info *info;
 269
 270         if (!commit_reflog)
 271                 return 0;
 272
 273         info = &commit_reflog->reflogs->items[commit_reflog->recno+1];
 274         return info->timestamp;
 275 }
 276
 277 void show_reflog_message(struct reflog_walk_info *reflog_info, int oneline,
 278                          const struct date_mode *dmode, int force_date)
 279 {
 280         if (reflog_info && reflog_info->last_commit_reflog) {
 281                 struct commit_reflog *commit_reflog = reflog_info->last_commit_reflog;
 282                 struct reflog_info *info;
 283                 struct strbuf selector = STRBUF_INIT;
 284
 285                 info = &commit_reflog->reflogs->items[commit_reflog->recno+1];
 286                 get_reflog_selector(&selector, reflog_info, dmode, force_date, 0);
 287                 if (oneline) {
 288                         printf("%s: %s", selector.buf, info->message);
 289                 }
 290                 else {
 291                         printf("Reflog: %s (%s)\nReflog message: %s",
 292                                selector.buf, info->email, info->message);
 293                 }
 294
 295                 strbuf_release(&selector);
 296         }
 297 }
 298
 299 int reflog_walk_empty(struct reflog_walk_info *info)
 300 {
 301         return !info || !info->nr;
 302 }
 303
 304 static struct commit *next_reflog_commit(struct commit_reflog *log)
 305 {
 306         for (; log->recno >= 0; log->recno--) {
 307                 struct reflog_info *entry = &log->reflogs->items[log->recno];
 308                 struct object *obj = parse_object(&entry->noid);
 309
 310                 if (obj && obj->type == OBJ_COMMIT)
 311                         return (struct commit *)obj;
 312         }
 313         return NULL;
 314 }
 315
 316 static timestamp_t log_timestamp(struct commit_reflog *log)
 317 {
 318         return log->reflogs->items[log->recno].timestamp;
 319 }
 320
 321 struct commit *next_reflog_entry(struct reflog_walk_info *walk)
 322 {
 323         struct commit_reflog *best = NULL;
 324         struct commit *best_commit = NULL;
 325         size_t i;
 326
 327         for (i = 0; i < walk->nr; i++) {
 328                 struct commit_reflog *log = walk->logs[i];
 329                 struct commit *commit = next_reflog_commit(log);
 330
 331                 if (!commit)
 332                         continue;
 333
 334                 if (!best || log_timestamp(log) > log_timestamp(best)) {
 335                         best = log;
 336                         best_commit = commit;
 337                 }
 338         }
 339
 340         if (best) {
 341                 best->recno--;
 342                 walk->last_commit_reflog = best;
 343                 return best_commit;
 344         }
 345
 346         return NULL;
 347 }