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