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         if (array->nr >= array->alloc) {
  30                 array->alloc = alloc_nr(array->nr + 1);
  31                 array->items = xrealloc(array->items, array->alloc *
  32                         sizeof(struct reflog_info));
  33         }
  34         item = array->items + array->nr;
  35         memcpy(item->osha1, osha1, 20);
  36         memcpy(item->nsha1, nsha1, 20);
  37         item->email = xstrdup(email);
  38         item->timestamp = timestamp;
  39         item->tz = tz;
  40         item->message = xstrdup(message);
  41         array->nr++;
  42         return 0;
  43 }
  44
  45 static struct complete_reflogs *read_complete_reflog(const char *ref)
  46 {
  47         struct complete_reflogs *reflogs =
  48                 xcalloc(sizeof(struct complete_reflogs), 1);
  49         reflogs->ref = xstrdup(ref);
  50         for_each_reflog_ent(ref, read_one_reflog, reflogs);
  51         if (reflogs->nr == 0) {
  52                 unsigned char sha1[20];
  53                 const char *name = resolve_ref(ref, sha1, 1, NULL);
  54                 if (name)
  55                         for_each_reflog_ent(name, read_one_reflog, reflogs);
  56         }
  57         if (reflogs->nr == 0) {
  58                 int len = strlen(ref);
  59                 char *refname = xmalloc(len + 12);
  60                 sprintf(refname, "refs/%s", ref);
  61                 for_each_reflog_ent(refname, read_one_reflog, reflogs);
  62                 if (reflogs->nr == 0) {
  63                         sprintf(refname, "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         if (lifo->nr >= lifo->alloc) {
 114                 lifo->alloc = alloc_nr(lifo->nr + 1);
 115                 lifo->items = xrealloc(lifo->items,
 116                         lifo->alloc * sizeof(struct commit_info));
 117         }
 118         info = lifo->items + lifo->nr;
 119         info->commit = commit;
 120         info->util = util;
 121         lifo->nr++;
 122 }
 123
 124 struct commit_reflog {
 125         int recno;
 126         enum selector_type {
 127                 SELECTOR_NONE,
 128                 SELECTOR_INDEX,
 129                 SELECTOR_DATE
 130         } selector;
 131         struct complete_reflogs *reflogs;
 132 };
 133
 134 struct reflog_walk_info {
 135         struct commit_info_lifo reflogs;
 136         struct string_list complete_reflogs;
 137         struct commit_reflog *last_commit_reflog;
 138 };
 139
 140 void init_reflog_walk(struct reflog_walk_info** info)
 141 {
 142         *info = xcalloc(sizeof(struct reflog_walk_info), 1);
 143 }
 144
 145 int add_reflog_for_walk(struct reflog_walk_info *info,
 146                 struct commit *commit, const char *name)
 147 {
 148         unsigned long timestamp = 0;
 149         int recno = -1;
 150         struct string_list_item *item;
 151         struct complete_reflogs *reflogs;
 152         char *branch, *at = strchr(name, '@');
 153         struct commit_reflog *commit_reflog;
 154         enum selector_type selector = SELECTOR_NONE;
 155
 156         if (commit->object.flags & UNINTERESTING)
 157                 die ("Cannot walk reflogs for %s", name);
 158
 159         branch = xstrdup(name);
 160         if (at && at[1] == '{') {
 161                 char *ep;
 162                 branch[at - name] = '\0';
 163                 recno = strtoul(at + 2, &ep, 10);
 164                 if (*ep != '}') {
 165                         recno = -1;
 166                         timestamp = approxidate(at + 2);
 167                         selector = SELECTOR_DATE;
 168                 }
 169                 else
 170                         selector = SELECTOR_INDEX;
 171         } else
 172                 recno = 0;
 173
 174         item = string_list_lookup(&info->complete_reflogs, branch);
 175         if (item)
 176                 reflogs = item->util;
 177         else {
 178                 if (*branch == '\0') {
 179                         unsigned char sha1[20];
 180                         const char *head = resolve_ref("HEAD", sha1, 0, NULL);
 181                         if (!head)
 182                                 die ("No current branch");
 183                         free(branch);
 184                         branch = xstrdup(head);
 185                 }
 186                 reflogs = read_complete_reflog(branch);
 187                 if (!reflogs || reflogs->nr == 0) {
 188                         unsigned char sha1[20];
 189                         char *b;
 190                         if (dwim_log(branch, strlen(branch), sha1, &b) == 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                         return -1;
 202                 string_list_insert(&info->complete_reflogs, branch)->util
 203                         = reflogs;
 204         }
 205
 206         commit_reflog = xcalloc(sizeof(struct commit_reflog), 1);
 207         if (recno < 0) {
 208                 commit_reflog->recno = get_reflog_recno_by_time(reflogs, timestamp);
 209                 if (commit_reflog->recno < 0) {
 210                         free(branch);
 211                         free(commit_reflog);
 212                         return -1;
 213                 }
 214         } else
 215                 commit_reflog->recno = reflogs->nr - recno - 1;
 216         commit_reflog->selector = selector;
 217         commit_reflog->reflogs = reflogs;
 218
 219         add_commit_info(commit, commit_reflog, &info->reflogs);
 220         return 0;
 221 }
 222
 223 void fake_reflog_parent(struct reflog_walk_info *info, struct commit *commit)
 224 {
 225         struct commit_info *commit_info =
 226                 get_commit_info(commit, &info->reflogs, 0);
 227         struct commit_reflog *commit_reflog;
 228         struct reflog_info *reflog;
 229
 230         info->last_commit_reflog = NULL;
 231         if (!commit_info)
 232                 return;
 233
 234         commit_reflog = commit_info->util;
 235         if (commit_reflog->recno < 0) {
 236                 commit->parents = NULL;
 237                 return;
 238         }
 239
 240         reflog = &commit_reflog->reflogs->items[commit_reflog->recno];
 241         info->last_commit_reflog = commit_reflog;
 242         commit_reflog->recno--;
 243         commit_info->commit = (struct commit *)parse_object(reflog->osha1);
 244         if (!commit_info->commit) {
 245                 commit->parents = NULL;
 246                 return;
 247         }
 248
 249         commit->parents = xcalloc(sizeof(struct commit_list), 1);
 250         commit->parents->item = commit_info->commit;
 251 }
 252
 253 void get_reflog_selector(struct strbuf *sb,
 254                          struct reflog_walk_info *reflog_info,
 255                          enum date_mode dmode,
 256                          int shorten)
 257 {
 258         struct commit_reflog *commit_reflog = reflog_info->last_commit_reflog;
 259         struct reflog_info *info;
 260         const char *printed_ref;
 261
 262         if (!commit_reflog)
 263                 return;
 264
 265         if (shorten) {
 266                 if (!commit_reflog->reflogs->short_ref)
 267                         commit_reflog->reflogs->short_ref
 268                                 = shorten_unambiguous_ref(commit_reflog->reflogs->ref, 0);
 269                 printed_ref = commit_reflog->reflogs->short_ref;
 270         } else {
 271                 printed_ref = commit_reflog->reflogs->ref;
 272         }
 273
 274         strbuf_addf(sb, "%s@{", printed_ref);
 275         if (commit_reflog->selector == SELECTOR_DATE ||
 276             (commit_reflog->selector == SELECTOR_NONE && dmode)) {
 277                 info = &commit_reflog->reflogs->items[commit_reflog->recno+1];
 278                 strbuf_addstr(sb, show_date(info->timestamp, info->tz, dmode));
 279         } else {
 280                 strbuf_addf(sb, "%d", commit_reflog->reflogs->nr
 281                             - 2 - commit_reflog->recno);
 282         }
 283
 284         strbuf_addch(sb, '}');
 285 }
 286
 287 void get_reflog_message(struct strbuf *sb,
 288                         struct reflog_walk_info *reflog_info)
 289 {
 290         struct commit_reflog *commit_reflog = reflog_info->last_commit_reflog;
 291         struct reflog_info *info;
 292         size_t len;
 293
 294         if (!commit_reflog)
 295                 return;
 296
 297         info = &commit_reflog->reflogs->items[commit_reflog->recno+1];
 298         len = strlen(info->message);
 299         if (len > 0)
 300                 len--; /* strip away trailing newline */
 301         strbuf_add(sb, info->message, len);
 302 }
 303
 304 void show_reflog_message(struct reflog_walk_info *reflog_info, int oneline,
 305         enum date_mode dmode)
 306 {
 307         if (reflog_info && reflog_info->last_commit_reflog) {
 308                 struct commit_reflog *commit_reflog = reflog_info->last_commit_reflog;
 309                 struct reflog_info *info;
 310                 struct strbuf selector = STRBUF_INIT;
 311
 312                 info = &commit_reflog->reflogs->items[commit_reflog->recno+1];
 313                 get_reflog_selector(&selector, reflog_info, dmode, 0);
 314                 if (oneline) {
 315                         printf("%s: %s", selector.buf, info->message);
 316                 }
 317                 else {
 318                         printf("Reflog: %s (%s)\nReflog message: %s",
 319                                selector.buf, info->email, info->message);
 320                 }
 321
 322                 strbuf_release(&selector);
 323         }
 324 }