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_info_lifo {
  98         struct commit_info {
  99                 struct commit *commit;
 100                 void *util;
 101         } *items;
 102         int nr, alloc;
 103 };
 104
 105 static struct commit_info *get_commit_info(struct commit *commit,
 106                 struct commit_info_lifo *lifo, int pop)
 107 {
 108         int i;
 109         for (i = 0; i < lifo->nr; i++)
 110                 if (lifo->items[i].commit == commit) {
 111                         struct commit_info *result = &lifo->items[i];
 112                         if (pop) {
 113                                 if (i + 1 < lifo->nr)
 114                                         memmove(lifo->items + i,
 115                                                 lifo->items + i + 1,
 116                                                 (lifo->nr - i) *
 117                                                 sizeof(struct commit_info));
 118                                 lifo->nr--;
 119                         }
 120                         return result;
 121                 }
 122         return NULL;
 123 }
 124
 125 static void add_commit_info(struct commit *commit, void *util,
 126                 struct commit_info_lifo *lifo)
 127 {
 128         struct commit_info *info;
 129         ALLOC_GROW(lifo->items, lifo->nr + 1, lifo->alloc);
 130         info = lifo->items + lifo->nr;
 131         info->commit = commit;
 132         info->util = util;
 133         lifo->nr++;
 134 }
 135
 136 struct commit_reflog {
 137         int recno;
 138         enum selector_type {
 139                 SELECTOR_NONE,
 140                 SELECTOR_INDEX,
 141                 SELECTOR_DATE
 142         } selector;
 143         struct complete_reflogs *reflogs;
 144 };
 145
 146 struct reflog_walk_info {
 147         struct commit_info_lifo reflogs;
 148         struct string_list complete_reflogs;
 149         struct commit_reflog *last_commit_reflog;
 150 };
 151
 152 void init_reflog_walk(struct reflog_walk_info **info)
 153 {
 154         *info = xcalloc(1, sizeof(struct reflog_walk_info));
 155         (*info)->complete_reflogs.strdup_strings = 1;
 156 }
 157
 158 int add_reflog_for_walk(struct reflog_walk_info *info,
 159                 struct commit *commit, const char *name)
 160 {
 161         timestamp_t timestamp = 0;
 162         int recno = -1;
 163         struct string_list_item *item;
 164         struct complete_reflogs *reflogs;
 165         char *branch, *at = strchr(name, '@');
 166         struct commit_reflog *commit_reflog;
 167         enum selector_type selector = SELECTOR_NONE;
 168
 169         if (commit->object.flags & UNINTERESTING)
 170                 die ("Cannot walk reflogs for %s", name);
 171
 172         branch = xstrdup(name);
 173         if (at && at[1] == '{') {
 174                 char *ep;
 175                 branch[at - name] = '\0';
 176                 recno = strtoul(at + 2, &ep, 10);
 177                 if (*ep != '}') {
 178                         recno = -1;
 179                         timestamp = approxidate(at + 2);
 180                         selector = SELECTOR_DATE;
 181                 }
 182                 else
 183                         selector = SELECTOR_INDEX;
 184         } else
 185                 recno = 0;
 186
 187         item = string_list_lookup(&info->complete_reflogs, branch);
 188         if (item)
 189                 reflogs = item->util;
 190         else {
 191                 if (*branch == '\0') {
 192                         struct object_id oid;
 193                         free(branch);
 194                         branch = resolve_refdup("HEAD", 0, oid.hash, NULL);
 195                         if (!branch)
 196                                 die ("No current branch");
 197
 198                 }
 199                 reflogs = read_complete_reflog(branch);
 200                 if (!reflogs || reflogs->nr == 0) {
 201                         struct object_id oid;
 202                         char *b;
 203                         int ret = dwim_log(branch, strlen(branch),
 204                                            oid.hash, &b);
 205                         if (ret > 1)
 206                                 free(b);
 207                         else if (ret == 1) {
 208                                 free_complete_reflog(reflogs);
 209                                 free(branch);
 210                                 branch = b;
 211                                 reflogs = read_complete_reflog(branch);
 212                         }
 213                 }
 214                 if (!reflogs || reflogs->nr == 0) {
 215                         free_complete_reflog(reflogs);
 216                         free(branch);
 217                         return -1;
 218                 }
 219                 string_list_insert(&info->complete_reflogs, branch)->util
 220                         = reflogs;
 221         }
 222         free(branch);
 223
 224         commit_reflog = xcalloc(1, sizeof(struct commit_reflog));
 225         if (recno < 0) {
 226                 commit_reflog->recno = get_reflog_recno_by_time(reflogs, timestamp);
 227                 if (commit_reflog->recno < 0) {
 228                         free(commit_reflog);
 229                         return -1;
 230                 }
 231         } else
 232                 commit_reflog->recno = reflogs->nr - recno - 1;
 233         commit_reflog->selector = selector;
 234         commit_reflog->reflogs = reflogs;
 235
 236         add_commit_info(commit, commit_reflog, &info->reflogs);
 237         return 0;
 238 }
 239
 240 void fake_reflog_parent(struct reflog_walk_info *info, struct commit *commit)
 241 {
 242         struct commit_info *commit_info =
 243                 get_commit_info(commit, &info->reflogs, 0);
 244         struct commit_reflog *commit_reflog;
 245         struct object *logobj;
 246         struct reflog_info *reflog;
 247
 248         info->last_commit_reflog = NULL;
 249         if (!commit_info)
 250                 return;
 251
 252         commit_reflog = commit_info->util;
 253         if (commit_reflog->recno < 0) {
 254                 commit->parents = NULL;
 255                 return;
 256         }
 257         info->last_commit_reflog = commit_reflog;
 258
 259         do {
 260                 reflog = &commit_reflog->reflogs->items[commit_reflog->recno];
 261                 commit_reflog->recno--;
 262                 logobj = parse_object(&reflog->ooid);
 263         } while (commit_reflog->recno && (logobj && logobj->type != OBJ_COMMIT));
 264
 265         if (!logobj && commit_reflog->recno >= 0 && is_null_oid(&reflog->ooid)) {
 266                 /* a root commit, but there are still more entries to show */
 267                 reflog = &commit_reflog->reflogs->items[commit_reflog->recno];
 268                 logobj = parse_object(&reflog->noid);
 269                 if (!logobj)
 270                         logobj = parse_object(&reflog->ooid);
 271         }
 272
 273         if (!logobj || logobj->type != OBJ_COMMIT) {
 274                 commit_info->commit = NULL;
 275                 commit->parents = NULL;
 276                 return;
 277         }
 278         commit_info->commit = (struct commit *)logobj;
 279
 280         commit->parents = xcalloc(1, sizeof(struct commit_list));
 281         commit->parents->item = commit_info->commit;
 282 }
 283
 284 void get_reflog_selector(struct strbuf *sb,
 285                          struct reflog_walk_info *reflog_info,
 286                          const struct date_mode *dmode, int force_date,
 287                          int shorten)
 288 {
 289         struct commit_reflog *commit_reflog = reflog_info->last_commit_reflog;
 290         struct reflog_info *info;
 291         const char *printed_ref;
 292
 293         if (!commit_reflog)
 294                 return;
 295
 296         if (shorten) {
 297                 if (!commit_reflog->reflogs->short_ref)
 298                         commit_reflog->reflogs->short_ref
 299                                 = shorten_unambiguous_ref(commit_reflog->reflogs->ref, 0);
 300                 printed_ref = commit_reflog->reflogs->short_ref;
 301         } else {
 302                 printed_ref = commit_reflog->reflogs->ref;
 303         }
 304
 305         strbuf_addf(sb, "%s@{", printed_ref);
 306         if (commit_reflog->selector == SELECTOR_DATE ||
 307             (commit_reflog->selector == SELECTOR_NONE && force_date)) {
 308                 info = &commit_reflog->reflogs->items[commit_reflog->recno+1];
 309                 strbuf_addstr(sb, show_date(info->timestamp, info->tz, dmode));
 310         } else {
 311                 strbuf_addf(sb, "%d", commit_reflog->reflogs->nr
 312                             - 2 - commit_reflog->recno);
 313         }
 314
 315         strbuf_addch(sb, '}');
 316 }
 317
 318 void get_reflog_message(struct strbuf *sb,
 319                         struct reflog_walk_info *reflog_info)
 320 {
 321         struct commit_reflog *commit_reflog = reflog_info->last_commit_reflog;
 322         struct reflog_info *info;
 323         size_t len;
 324
 325         if (!commit_reflog)
 326                 return;
 327
 328         info = &commit_reflog->reflogs->items[commit_reflog->recno+1];
 329         len = strlen(info->message);
 330         if (len > 0)
 331                 len--; /* strip away trailing newline */
 332         strbuf_add(sb, info->message, len);
 333 }
 334
 335 const char *get_reflog_ident(struct reflog_walk_info *reflog_info)
 336 {
 337         struct commit_reflog *commit_reflog = reflog_info->last_commit_reflog;
 338         struct reflog_info *info;
 339
 340         if (!commit_reflog)
 341                 return NULL;
 342
 343         info = &commit_reflog->reflogs->items[commit_reflog->recno+1];
 344         return info->email;
 345 }
 346
 347 void show_reflog_message(struct reflog_walk_info *reflog_info, int oneline,
 348                          const struct date_mode *dmode, int force_date)
 349 {
 350         if (reflog_info && reflog_info->last_commit_reflog) {
 351                 struct commit_reflog *commit_reflog = reflog_info->last_commit_reflog;
 352                 struct reflog_info *info;
 353                 struct strbuf selector = STRBUF_INIT;
 354
 355                 info = &commit_reflog->reflogs->items[commit_reflog->recno+1];
 356                 get_reflog_selector(&selector, reflog_info, dmode, force_date, 0);
 357                 if (oneline) {
 358                         printf("%s: %s", selector.buf, info->message);
 359                 }
 360                 else {
 361                         printf("Reflog: %s (%s)\nReflog message: %s",
 362                                selector.buf, info->email, info->message);
 363                 }
 364
 365                 strbuf_release(&selector);
 366         }
 367 }