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                 unsigned char osha1[20], nsha1[20];
  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(unsigned char *osha1, unsigned char *nsha1,
  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         hashcpy(item->osha1, osha1);
  32         hashcpy(item->nsha1, nsha1);
  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                 unsigned char sha1[20];
  49                 const char *name;
  50                 void *name_to_free;
  51                 name = name_to_free = resolve_refdup(ref, RESOLVE_REF_READING,
  52                                                      sha1, 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                         unsigned char sha1[20];
 176                         free(branch);
 177                         branch = resolve_refdup("HEAD", 0, sha1, NULL);
 178                         if (!branch)
 179                                 die ("No current branch");
 180
 181                 }
 182                 reflogs = read_complete_reflog(branch);
 183                 if (!reflogs || reflogs->nr == 0) {
 184                         unsigned char sha1[20];
 185                         char *b;
 186                         if (dwim_log(branch, strlen(branch), sha1, &b) == 1) {
 187                                 if (reflogs) {
 188                                         free(reflogs->ref);
 189                                         free(reflogs);
 190                                 }
 191                                 free(branch);
 192                                 branch = b;
 193                                 reflogs = read_complete_reflog(branch);
 194                         }
 195                 }
 196                 if (!reflogs || reflogs->nr == 0)
 197                         return -1;
 198                 string_list_insert(&info->complete_reflogs, branch)->util
 199                         = reflogs;
 200         }
 201
 202         commit_reflog = xcalloc(1, sizeof(struct commit_reflog));
 203         if (recno < 0) {
 204                 commit_reflog->recno = get_reflog_recno_by_time(reflogs, timestamp);
 205                 if (commit_reflog->recno < 0) {
 206                         free(branch);
 207                         free(commit_reflog);
 208                         return -1;
 209                 }
 210         } else
 211                 commit_reflog->recno = reflogs->nr - recno - 1;
 212         commit_reflog->selector = selector;
 213         commit_reflog->reflogs = reflogs;
 214
 215         add_commit_info(commit, commit_reflog, &info->reflogs);
 216         return 0;
 217 }
 218
 219 void fake_reflog_parent(struct reflog_walk_info *info, struct commit *commit)
 220 {
 221         struct commit_info *commit_info =
 222                 get_commit_info(commit, &info->reflogs, 0);
 223         struct commit_reflog *commit_reflog;
 224         struct object *logobj;
 225         struct reflog_info *reflog;
 226
 227         info->last_commit_reflog = NULL;
 228         if (!commit_info)
 229                 return;
 230
 231         commit_reflog = commit_info->util;
 232         if (commit_reflog->recno < 0) {
 233                 commit->parents = NULL;
 234                 return;
 235         }
 236         info->last_commit_reflog = commit_reflog;
 237
 238         do {
 239                 reflog = &commit_reflog->reflogs->items[commit_reflog->recno];
 240                 commit_reflog->recno--;
 241                 logobj = parse_object(reflog->osha1);
 242         } while (commit_reflog->recno && (logobj && logobj->type != OBJ_COMMIT));
 243
 244         if (!logobj && commit_reflog->recno >= 0 && is_null_sha1(reflog->osha1)) {
 245                 /* a root commit, but there are still more entries to show */
 246                 reflog = &commit_reflog->reflogs->items[commit_reflog->recno];
 247                 logobj = parse_object(reflog->nsha1);
 248         }
 249
 250         if (!logobj || logobj->type != OBJ_COMMIT) {
 251                 commit_info->commit = NULL;
 252                 commit->parents = NULL;
 253                 return;
 254         }
 255         commit_info->commit = (struct commit *)logobj;
 256
 257         commit->parents = xcalloc(1, sizeof(struct commit_list));
 258         commit->parents->item = commit_info->commit;
 259 }
 260
 261 void get_reflog_selector(struct strbuf *sb,
 262                          struct reflog_walk_info *reflog_info,
 263                          const struct date_mode *dmode, int force_date,
 264                          int shorten)
 265 {
 266         struct commit_reflog *commit_reflog = reflog_info->last_commit_reflog;
 267         struct reflog_info *info;
 268         const char *printed_ref;
 269
 270         if (!commit_reflog)
 271                 return;
 272
 273         if (shorten) {
 274                 if (!commit_reflog->reflogs->short_ref)
 275                         commit_reflog->reflogs->short_ref
 276                                 = shorten_unambiguous_ref(commit_reflog->reflogs->ref, 0);
 277                 printed_ref = commit_reflog->reflogs->short_ref;
 278         } else {
 279                 printed_ref = commit_reflog->reflogs->ref;
 280         }
 281
 282         strbuf_addf(sb, "%s@{", printed_ref);
 283         if (commit_reflog->selector == SELECTOR_DATE ||
 284             (commit_reflog->selector == SELECTOR_NONE && force_date)) {
 285                 info = &commit_reflog->reflogs->items[commit_reflog->recno+1];
 286                 strbuf_addstr(sb, show_date(info->timestamp, info->tz, dmode));
 287         } else {
 288                 strbuf_addf(sb, "%d", commit_reflog->reflogs->nr
 289                             - 2 - commit_reflog->recno);
 290         }
 291
 292         strbuf_addch(sb, '}');
 293 }
 294
 295 void get_reflog_message(struct strbuf *sb,
 296                         struct reflog_walk_info *reflog_info)
 297 {
 298         struct commit_reflog *commit_reflog = reflog_info->last_commit_reflog;
 299         struct reflog_info *info;
 300         size_t len;
 301
 302         if (!commit_reflog)
 303                 return;
 304
 305         info = &commit_reflog->reflogs->items[commit_reflog->recno+1];
 306         len = strlen(info->message);
 307         if (len > 0)
 308                 len--; /* strip away trailing newline */
 309         strbuf_add(sb, info->message, len);
 310 }
 311
 312 const char *get_reflog_ident(struct reflog_walk_info *reflog_info)
 313 {
 314         struct commit_reflog *commit_reflog = reflog_info->last_commit_reflog;
 315         struct reflog_info *info;
 316
 317         if (!commit_reflog)
 318                 return NULL;
 319
 320         info = &commit_reflog->reflogs->items[commit_reflog->recno+1];
 321         return info->email;
 322 }
 323
 324 void show_reflog_message(struct reflog_walk_info *reflog_info, int oneline,
 325                          const struct date_mode *dmode, int force_date)
 326 {
 327         if (reflog_info && reflog_info->last_commit_reflog) {
 328                 struct commit_reflog *commit_reflog = reflog_info->last_commit_reflog;
 329                 struct reflog_info *info;
 330                 struct strbuf selector = STRBUF_INIT;
 331
 332                 info = &commit_reflog->reflogs->items[commit_reflog->recno+1];
 333                 get_reflog_selector(&selector, reflog_info, dmode, force_date, 0);
 334                 if (oneline) {
 335                         printf("%s: %s", selector.buf, info->message);
 336                 }
 337                 else {
 338                         printf("Reflog: %s (%s)\nReflog message: %s",
 339                                selector.buf, info->email, info->message);
 340                 }
 341
 342                 strbuf_release(&selector);
 343         }
 344 }