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 }
 140
 141 int add_reflog_for_walk(struct reflog_walk_info *info,
 142                 struct commit *commit, const char *name)
 143 {
 144         unsigned long timestamp = 0;
 145         int recno = -1;
 146         struct string_list_item *item;
 147         struct complete_reflogs *reflogs;
 148         char *branch, *at = strchr(name, '@');
 149         struct commit_reflog *commit_reflog;
 150         enum selector_type selector = SELECTOR_NONE;
 151
 152         if (commit->object.flags & UNINTERESTING)
 153                 die ("Cannot walk reflogs for %s", name);
 154
 155         branch = xstrdup(name);
 156         if (at && at[1] == '{') {
 157                 char *ep;
 158                 branch[at - name] = '\0';
 159                 recno = strtoul(at + 2, &ep, 10);
 160                 if (*ep != '}') {
 161                         recno = -1;
 162                         timestamp = approxidate(at + 2);
 163                         selector = SELECTOR_DATE;
 164                 }
 165                 else
 166                         selector = SELECTOR_INDEX;
 167         } else
 168                 recno = 0;
 169
 170         item = string_list_lookup(&info->complete_reflogs, branch);
 171         if (item)
 172                 reflogs = item->util;
 173         else {
 174                 if (*branch == '\0') {
 175                         struct object_id oid;
 176                         free(branch);
 177                         branch = resolve_refdup("HEAD", 0, oid.hash, NULL);
 178                         if (!branch)
 179                                 die ("No current branch");
 180
 181                 }
 182                 reflogs = read_complete_reflog(branch);
 183                 if (!reflogs || reflogs->nr == 0) {
 184                         struct object_id oid;
 185                         char *b;
 186                         int ret = dwim_log(branch, strlen(branch),
 187                                            oid.hash, &b);
 188                         if (ret > 1)
 189                                 free(b);
 190                         else if (ret == 1) {
 191                                 if (reflogs) {
 192                                         free(reflogs->ref);
 193                                         free(reflogs);
 194                                 }
 195                                 free(branch);
 196                                 branch = b;
 197                                 reflogs = read_complete_reflog(branch);
 198                         }
 199                 }
 200                 if (!reflogs || reflogs->nr == 0) {
 201                         if (reflogs) {
 202                                 free(reflogs->ref);
 203                                 free(reflogs);
 204                         }
 205                         free(branch);
 206                         return -1;
 207                 }
 208                 string_list_insert(&info->complete_reflogs, branch)->util
 209                         = reflogs;
 210         }
 211         free(branch);
 212
 213         commit_reflog = xcalloc(1, sizeof(struct commit_reflog));
 214         if (recno < 0) {
 215                 commit_reflog->recno = get_reflog_recno_by_time(reflogs, timestamp);
 216                 if (commit_reflog->recno < 0) {
 217                         if (reflogs) {
 218                                 free(reflogs->ref);
 219                                 free(reflogs);
 220                         }
 221                         free(commit_reflog);
 222                         return -1;
 223                 }
 224         } else
 225                 commit_reflog->recno = reflogs->nr - recno - 1;
 226         commit_reflog->selector = selector;
 227         commit_reflog->reflogs = reflogs;
 228
 229         add_commit_info(commit, commit_reflog, &info->reflogs);
 230         return 0;
 231 }
 232
 233 void fake_reflog_parent(struct reflog_walk_info *info, struct commit *commit)
 234 {
 235         struct commit_info *commit_info =
 236                 get_commit_info(commit, &info->reflogs, 0);
 237         struct commit_reflog *commit_reflog;
 238         struct object *logobj;
 239         struct reflog_info *reflog;
 240
 241         info->last_commit_reflog = NULL;
 242         if (!commit_info)
 243                 return;
 244
 245         commit_reflog = commit_info->util;
 246         if (commit_reflog->recno < 0) {
 247                 commit->parents = NULL;
 248                 return;
 249         }
 250         info->last_commit_reflog = commit_reflog;
 251
 252         do {
 253                 reflog = &commit_reflog->reflogs->items[commit_reflog->recno];
 254                 commit_reflog->recno--;
 255                 logobj = parse_object(reflog->ooid.hash);
 256         } while (commit_reflog->recno && (logobj && logobj->type != OBJ_COMMIT));
 257
 258         if (!logobj && commit_reflog->recno >= 0 && is_null_sha1(reflog->ooid.hash)) {
 259                 /* a root commit, but there are still more entries to show */
 260                 reflog = &commit_reflog->reflogs->items[commit_reflog->recno];
 261                 logobj = parse_object(reflog->noid.hash);
 262         }
 263
 264         if (!logobj || logobj->type != OBJ_COMMIT) {
 265                 commit_info->commit = NULL;
 266                 commit->parents = NULL;
 267                 return;
 268         }
 269         commit_info->commit = (struct commit *)logobj;
 270
 271         commit->parents = xcalloc(1, sizeof(struct commit_list));
 272         commit->parents->item = commit_info->commit;
 273 }
 274
 275 void get_reflog_selector(struct strbuf *sb,
 276                          struct reflog_walk_info *reflog_info,
 277                          const struct date_mode *dmode, int force_date,
 278                          int shorten)
 279 {
 280         struct commit_reflog *commit_reflog = reflog_info->last_commit_reflog;
 281         struct reflog_info *info;
 282         const char *printed_ref;
 283
 284         if (!commit_reflog)
 285                 return;
 286
 287         if (shorten) {
 288                 if (!commit_reflog->reflogs->short_ref)
 289                         commit_reflog->reflogs->short_ref
 290                                 = shorten_unambiguous_ref(commit_reflog->reflogs->ref, 0);
 291                 printed_ref = commit_reflog->reflogs->short_ref;
 292         } else {
 293                 printed_ref = commit_reflog->reflogs->ref;
 294         }
 295
 296         strbuf_addf(sb, "%s@{", printed_ref);
 297         if (commit_reflog->selector == SELECTOR_DATE ||
 298             (commit_reflog->selector == SELECTOR_NONE && force_date)) {
 299                 info = &commit_reflog->reflogs->items[commit_reflog->recno+1];
 300                 strbuf_addstr(sb, show_date(info->timestamp, info->tz, dmode));
 301         } else {
 302                 strbuf_addf(sb, "%d", commit_reflog->reflogs->nr
 303                             - 2 - commit_reflog->recno);
 304         }
 305
 306         strbuf_addch(sb, '}');
 307 }
 308
 309 void get_reflog_message(struct strbuf *sb,
 310                         struct reflog_walk_info *reflog_info)
 311 {
 312         struct commit_reflog *commit_reflog = reflog_info->last_commit_reflog;
 313         struct reflog_info *info;
 314         size_t len;
 315
 316         if (!commit_reflog)
 317                 return;
 318
 319         info = &commit_reflog->reflogs->items[commit_reflog->recno+1];
 320         len = strlen(info->message);
 321         if (len > 0)
 322                 len--; /* strip away trailing newline */
 323         strbuf_add(sb, info->message, len);
 324 }
 325
 326 const char *get_reflog_ident(struct reflog_walk_info *reflog_info)
 327 {
 328         struct commit_reflog *commit_reflog = reflog_info->last_commit_reflog;
 329         struct reflog_info *info;
 330
 331         if (!commit_reflog)
 332                 return NULL;
 333
 334         info = &commit_reflog->reflogs->items[commit_reflog->recno+1];
 335         return info->email;
 336 }
 337
 338 void show_reflog_message(struct reflog_walk_info *reflog_info, int oneline,
 339                          const struct date_mode *dmode, int force_date)
 340 {
 341         if (reflog_info && reflog_info->last_commit_reflog) {
 342                 struct commit_reflog *commit_reflog = reflog_info->last_commit_reflog;
 343                 struct reflog_info *info;
 344                 struct strbuf selector = STRBUF_INIT;
 345
 346                 info = &commit_reflog->reflogs->items[commit_reflog->recno+1];
 347                 get_reflog_selector(&selector, reflog_info, dmode, force_date, 0);
 348                 if (oneline) {
 349                         printf("%s: %s", selector.buf, info->message);
 350                 }
 351                 else {
 352                         printf("Reflog: %s (%s)\nReflog message: %s",
 353                                selector.buf, info->email, info->message);
 354                 }
 355
 356                 strbuf_release(&selector);
 357         }
 358 }