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                 unsigned long 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, unsigned long 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 struct complete_reflogs *read_complete_reflog(const char *ref)
  42 {
  43         struct complete_reflogs *reflogs =
  44                 xcalloc(1, sizeof(struct complete_reflogs));
  45         reflogs->ref = xstrdup(ref);
  46         for_each_reflog_ent(ref, read_one_reflog, reflogs);
  47         if (reflogs->nr == 0) {
  48                 struct object_id oid;
  49                 const char *name;
  50                 void *name_to_free;
  51                 name = name_to_free = resolve_refdup(ref, RESOLVE_REF_READING,
  52                                                      oid.hash, NULL);
  53                 if (name) {
  54                         for_each_reflog_ent(name, read_one_reflog, reflogs);
  55                         free(name_to_free);
  56                 }
  57         }
  58         if (reflogs->nr == 0) {
  59                 char *refname = xstrfmt("refs/%s", ref);
  60                 for_each_reflog_ent(refname, read_one_reflog, reflogs);
  61                 if (reflogs->nr == 0) {
  62                         free(refname);
  63                         refname = xstrfmt("refs/heads/%s", ref);
  64                         for_each_reflog_ent(refname, read_one_reflog, reflogs);
  65                 }
  66                 free(refname);
  67         }
  68         return reflogs;
  69 }
  70
  71 static int get_reflog_recno_by_time(struct complete_reflogs *array,
  72         unsigned long timestamp)
  73 {
  74         int i;
  75         for (i = array->nr - 1; i >= 0; i--)
  76                 if (timestamp >= array->items[i].timestamp)
  77                         return i;
  78         return -1;
  79 }
  80
  81 struct commit_info_lifo {
  82         struct commit_info {
  83                 struct commit *commit;
  84                 void *util;
  85         } *items;
  86         int nr, alloc;
  87 };
  88
  89 static struct commit_info *get_commit_info(struct commit *commit,
  90                 struct commit_info_lifo *lifo, int pop)
  91 {
  92         int i;
  93         for (i = 0; i < lifo->nr; i++)
  94                 if (lifo->items[i].commit == commit) {
  95                         struct commit_info *result = &lifo->items[i];
  96                         if (pop) {
  97                                 if (i + 1 < lifo->nr)
  98                                         memmove(lifo->items + i,
  99                                                 lifo->items + i + 1,
 100                                                 (lifo->nr - i) *
 101                                                 sizeof(struct commit_info));
 102                                 lifo->nr--;
 103                         }
 104                         return result;
 105                 }
 106         return NULL;
 107 }
 108
 109 static void add_commit_info(struct commit *commit, void *util,
 110                 struct commit_info_lifo *lifo)
 111 {
 112         struct commit_info *info;
 113         ALLOC_GROW(lifo->items, lifo->nr + 1, lifo->alloc);
 114         info = lifo->items + lifo->nr;
 115         info->commit = commit;
 116         info->util = util;
 117         lifo->nr++;
 118 }
 119
 120 struct commit_reflog {
 121         int recno;
 122         enum selector_type {
 123                 SELECTOR_NONE,
 124                 SELECTOR_INDEX,
 125                 SELECTOR_DATE
 126         } selector;
 127         struct complete_reflogs *reflogs;
 128 };
 129
 130 struct reflog_walk_info {
 131         struct commit_info_lifo reflogs;
 132         struct string_list complete_reflogs;
 133         struct commit_reflog *last_commit_reflog;
 134 };
 135
 136 void init_reflog_walk(struct reflog_walk_info **info)
 137 {
 138         *info = xcalloc(1, sizeof(struct reflog_walk_info));
 139         (*info)->complete_reflogs.strdup_strings = 1;
 140 }
 141
 142 int add_reflog_for_walk(struct reflog_walk_info *info,
 143                 struct commit *commit, const char *name)
 144 {
 145         unsigned long 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                         struct object_id oid;
 177                         free(branch);
 178                         branch = resolve_refdup("HEAD", 0, oid.hash, NULL);
 179                         if (!branch)
 180                                 die ("No current branch");
 181
 182                 }
 183                 reflogs = read_complete_reflog(branch);
 184                 if (!reflogs || reflogs->nr == 0) {
 185                         struct object_id oid;
 186                         char *b;
 187                         int ret = dwim_log(branch, strlen(branch),
 188                                            oid.hash, &b);
 189                         if (ret > 1)
 190                                 free(b);
 191                         else if (ret == 1) {
 192                                 if (reflogs) {
 193                                         free(reflogs->ref);
 194                                         free(reflogs);
 195                                 }
 196                                 free(branch);
 197                                 branch = b;
 198                                 reflogs = read_complete_reflog(branch);
 199                         }
 200                 }
 201                 if (!reflogs || reflogs->nr == 0) {
 202                         if (reflogs) {
 203                                 free(reflogs->ref);
 204                                 free(reflogs);
 205                         }
 206                         free(branch);
 207                         return -1;
 208                 }
 209                 string_list_insert(&info->complete_reflogs, branch)->util
 210                         = reflogs;
 211         }
 212         free(branch);
 213
 214         commit_reflog = xcalloc(1, sizeof(struct commit_reflog));
 215         if (recno < 0) {
 216                 commit_reflog->recno = get_reflog_recno_by_time(reflogs, timestamp);
 217                 if (commit_reflog->recno < 0) {
 218                         free(commit_reflog);
 219                         return -1;
 220                 }
 221         } else
 222                 commit_reflog->recno = reflogs->nr - recno - 1;
 223         commit_reflog->selector = selector;
 224         commit_reflog->reflogs = reflogs;
 225
 226         add_commit_info(commit, commit_reflog, &info->reflogs);
 227         return 0;
 228 }
 229
 230 void fake_reflog_parent(struct reflog_walk_info *info, struct commit *commit)
 231 {
 232         struct commit_info *commit_info =
 233                 get_commit_info(commit, &info->reflogs, 0);
 234         struct commit_reflog *commit_reflog;
 235         struct object *logobj;
 236         struct reflog_info *reflog;
 237
 238         info->last_commit_reflog = NULL;
 239         if (!commit_info)
 240                 return;
 241
 242         commit_reflog = commit_info->util;
 243         if (commit_reflog->recno < 0) {
 244                 commit->parents = NULL;
 245                 return;
 246         }
 247         info->last_commit_reflog = commit_reflog;
 248
 249         do {
 250                 reflog = &commit_reflog->reflogs->items[commit_reflog->recno];
 251                 commit_reflog->recno--;
 252                 logobj = parse_object(reflog->ooid.hash);
 253         } while (commit_reflog->recno && (logobj && logobj->type != OBJ_COMMIT));
 254
 255         if (!logobj && commit_reflog->recno >= 0 && is_null_sha1(reflog->ooid.hash)) {
 256                 /* a root commit, but there are still more entries to show */
 257                 reflog = &commit_reflog->reflogs->items[commit_reflog->recno];
 258                 logobj = parse_object(reflog->noid.hash);
 259                 if (!logobj)
 260                         logobj = parse_object(reflog->ooid.hash);
 261         }
 262
 263         if (!logobj || logobj->type != OBJ_COMMIT) {
 264                 commit_info->commit = NULL;
 265                 commit->parents = NULL;
 266                 return;
 267         }
 268         commit_info->commit = (struct commit *)logobj;
 269
 270         commit->parents = xcalloc(1, sizeof(struct commit_list));
 271         commit->parents->item = commit_info->commit;
 272 }
 273
 274 void get_reflog_selector(struct strbuf *sb,
 275                          struct reflog_walk_info *reflog_info,
 276                          const struct date_mode *dmode, int force_date,
 277                          int shorten)
 278 {
 279         struct commit_reflog *commit_reflog = reflog_info->last_commit_reflog;
 280         struct reflog_info *info;
 281         const char *printed_ref;
 282
 283         if (!commit_reflog)
 284                 return;
 285
 286         if (shorten) {
 287                 if (!commit_reflog->reflogs->short_ref)
 288                         commit_reflog->reflogs->short_ref
 289                                 = shorten_unambiguous_ref(commit_reflog->reflogs->ref, 0);
 290                 printed_ref = commit_reflog->reflogs->short_ref;
 291         } else {
 292                 printed_ref = commit_reflog->reflogs->ref;
 293         }
 294
 295         strbuf_addf(sb, "%s@{", printed_ref);
 296         if (commit_reflog->selector == SELECTOR_DATE ||
 297             (commit_reflog->selector == SELECTOR_NONE && force_date)) {
 298                 info = &commit_reflog->reflogs->items[commit_reflog->recno+1];
 299                 strbuf_addstr(sb, show_date(info->timestamp, info->tz, dmode));
 300         } else {
 301                 strbuf_addf(sb, "%d", commit_reflog->reflogs->nr
 302                             - 2 - commit_reflog->recno);
 303         }
 304
 305         strbuf_addch(sb, '}');
 306 }
 307
 308 void get_reflog_message(struct strbuf *sb,
 309                         struct reflog_walk_info *reflog_info)
 310 {
 311         struct commit_reflog *commit_reflog = reflog_info->last_commit_reflog;
 312         struct reflog_info *info;
 313         size_t len;
 314
 315         if (!commit_reflog)
 316                 return;
 317
 318         info = &commit_reflog->reflogs->items[commit_reflog->recno+1];
 319         len = strlen(info->message);
 320         if (len > 0)
 321                 len--; /* strip away trailing newline */
 322         strbuf_add(sb, info->message, len);
 323 }
 324
 325 const char *get_reflog_ident(struct reflog_walk_info *reflog_info)
 326 {
 327         struct commit_reflog *commit_reflog = reflog_info->last_commit_reflog;
 328         struct reflog_info *info;
 329
 330         if (!commit_reflog)
 331                 return NULL;
 332
 333         info = &commit_reflog->reflogs->items[commit_reflog->recno+1];
 334         return info->email;
 335 }
 336
 337 void show_reflog_message(struct reflog_walk_info *reflog_info, int oneline,
 338                          const struct date_mode *dmode, int force_date)
 339 {
 340         if (reflog_info && reflog_info->last_commit_reflog) {
 341                 struct commit_reflog *commit_reflog = reflog_info->last_commit_reflog;
 342                 struct reflog_info *info;
 343                 struct strbuf selector = STRBUF_INIT;
 344
 345                 info = &commit_reflog->reflogs->items[commit_reflog->recno+1];
 346                 get_reflog_selector(&selector, reflog_info, dmode, force_date, 0);
 347                 if (oneline) {
 348                         printf("%s: %s", selector.buf, info->message);
 349                 }
 350                 else {
 351                         printf("Reflog: %s (%s)\nReflog message: %s",
 352                                selector.buf, info->email, info->message);
 353                 }
 354
 355                 strbuf_release(&selector);
 356         }
 357 }