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;
  54                 void *name_to_free;
  55                 name = name_to_free = resolve_refdup(ref, sha1, 1, NULL);
  56                 if (name) {
  57                         for_each_reflog_ent(name, read_one_reflog, reflogs);
  58                         free(name_to_free);
  59                 }
  60         }
  61         if (reflogs->nr == 0) {
  62                 int len = strlen(ref);
  63                 char *refname = xmalloc(len + 12);
  64                 sprintf(refname, "refs/%s", ref);
  65                 for_each_reflog_ent(refname, read_one_reflog, reflogs);
  66                 if (reflogs->nr == 0) {
  67                         sprintf(refname, "refs/heads/%s", ref);
  68                         for_each_reflog_ent(refname, read_one_reflog, reflogs);
  69                 }
  70                 free(refname);
  71         }
  72         return reflogs;
  73 }
  74
  75 static int get_reflog_recno_by_time(struct complete_reflogs *array,
  76         unsigned long timestamp)
  77 {
  78         int i;
  79         for (i = array->nr - 1; i >= 0; i--)
  80                 if (timestamp >= array->items[i].timestamp)
  81                         return i;
  82         return -1;
  83 }
  84
  85 struct commit_info_lifo {
  86         struct commit_info {
  87                 struct commit *commit;
  88                 void *util;
  89         } *items;
  90         int nr, alloc;
  91 };
  92
  93 static struct commit_info *get_commit_info(struct commit *commit,
  94                 struct commit_info_lifo *lifo, int pop)
  95 {
  96         int i;
  97         for (i = 0; i < lifo->nr; i++)
  98                 if (lifo->items[i].commit == commit) {
  99                         struct commit_info *result = &lifo->items[i];
 100                         if (pop) {
 101                                 if (i + 1 < lifo->nr)
 102                                         memmove(lifo->items + i,
 103                                                 lifo->items + i + 1,
 104                                                 (lifo->nr - i) *
 105                                                 sizeof(struct commit_info));
 106                                 lifo->nr--;
 107                         }
 108                         return result;
 109                 }
 110         return NULL;
 111 }
 112
 113 static void add_commit_info(struct commit *commit, void *util,
 114                 struct commit_info_lifo *lifo)
 115 {
 116         struct commit_info *info;
 117         if (lifo->nr >= lifo->alloc) {
 118                 lifo->alloc = alloc_nr(lifo->nr + 1);
 119                 lifo->items = xrealloc(lifo->items,
 120                         lifo->alloc * sizeof(struct commit_info));
 121         }
 122         info = lifo->items + lifo->nr;
 123         info->commit = commit;
 124         info->util = util;
 125         lifo->nr++;
 126 }
 127
 128 struct commit_reflog {
 129         int recno;
 130         enum selector_type {
 131                 SELECTOR_NONE,
 132                 SELECTOR_INDEX,
 133                 SELECTOR_DATE
 134         } selector;
 135         struct complete_reflogs *reflogs;
 136 };
 137
 138 struct reflog_walk_info {
 139         struct commit_info_lifo reflogs;
 140         struct string_list complete_reflogs;
 141         struct commit_reflog *last_commit_reflog;
 142 };
 143
 144 void init_reflog_walk(struct reflog_walk_info** info)
 145 {
 146         *info = xcalloc(sizeof(struct reflog_walk_info), 1);
 147 }
 148
 149 int add_reflog_for_walk(struct reflog_walk_info *info,
 150                 struct commit *commit, const char *name)
 151 {
 152         unsigned long timestamp = 0;
 153         int recno = -1;
 154         struct string_list_item *item;
 155         struct complete_reflogs *reflogs;
 156         char *branch, *at = strchr(name, '@');
 157         struct commit_reflog *commit_reflog;
 158         enum selector_type selector = SELECTOR_NONE;
 159
 160         if (commit->object.flags & UNINTERESTING)
 161                 die ("Cannot walk reflogs for %s", name);
 162
 163         branch = xstrdup(name);
 164         if (at && at[1] == '{') {
 165                 char *ep;
 166                 branch[at - name] = '\0';
 167                 recno = strtoul(at + 2, &ep, 10);
 168                 if (*ep != '}') {
 169                         recno = -1;
 170                         timestamp = approxidate(at + 2);
 171                         selector = SELECTOR_DATE;
 172                 }
 173                 else
 174                         selector = SELECTOR_INDEX;
 175         } else
 176                 recno = 0;
 177
 178         item = string_list_lookup(&info->complete_reflogs, branch);
 179         if (item)
 180                 reflogs = item->util;
 181         else {
 182                 if (*branch == '\0') {
 183                         unsigned char sha1[20];
 184                         free(branch);
 185                         branch = resolve_refdup("HEAD", sha1, 0, NULL);
 186                         if (!branch)
 187                                 die ("No current branch");
 188
 189                 }
 190                 reflogs = read_complete_reflog(branch);
 191                 if (!reflogs || reflogs->nr == 0) {
 192                         unsigned char sha1[20];
 193                         char *b;
 194                         if (dwim_log(branch, strlen(branch), sha1, &b) == 1) {
 195                                 if (reflogs) {
 196                                         free(reflogs->ref);
 197                                         free(reflogs);
 198                                 }
 199                                 free(branch);
 200                                 branch = b;
 201                                 reflogs = read_complete_reflog(branch);
 202                         }
 203                 }
 204                 if (!reflogs || reflogs->nr == 0)
 205                         return -1;
 206                 string_list_insert(&info->complete_reflogs, branch)->util
 207                         = reflogs;
 208         }
 209
 210         commit_reflog = xcalloc(sizeof(struct commit_reflog), 1);
 211         if (recno < 0) {
 212                 commit_reflog->recno = get_reflog_recno_by_time(reflogs, timestamp);
 213                 if (commit_reflog->recno < 0) {
 214                         free(branch);
 215                         free(commit_reflog);
 216                         return -1;
 217                 }
 218         } else
 219                 commit_reflog->recno = reflogs->nr - recno - 1;
 220         commit_reflog->selector = selector;
 221         commit_reflog->reflogs = reflogs;
 222
 223         add_commit_info(commit, commit_reflog, &info->reflogs);
 224         return 0;
 225 }
 226
 227 void fake_reflog_parent(struct reflog_walk_info *info, struct commit *commit)
 228 {
 229         struct commit_info *commit_info =
 230                 get_commit_info(commit, &info->reflogs, 0);
 231         struct commit_reflog *commit_reflog;
 232         struct reflog_info *reflog;
 233
 234         info->last_commit_reflog = NULL;
 235         if (!commit_info)
 236                 return;
 237
 238         commit_reflog = commit_info->util;
 239         if (commit_reflog->recno < 0) {
 240                 commit->parents = NULL;
 241                 return;
 242         }
 243
 244         reflog = &commit_reflog->reflogs->items[commit_reflog->recno];
 245         info->last_commit_reflog = commit_reflog;
 246         commit_reflog->recno--;
 247         commit_info->commit = (struct commit *)parse_object(reflog->osha1);
 248         if (!commit_info->commit) {
 249                 commit->parents = NULL;
 250                 return;
 251         }
 252
 253         commit->parents = xcalloc(sizeof(struct commit_list), 1);
 254         commit->parents->item = commit_info->commit;
 255 }
 256
 257 void get_reflog_selector(struct strbuf *sb,
 258                          struct reflog_walk_info *reflog_info,
 259                          enum date_mode dmode, int force_date,
 260                          int shorten)
 261 {
 262         struct commit_reflog *commit_reflog = reflog_info->last_commit_reflog;
 263         struct reflog_info *info;
 264         const char *printed_ref;
 265
 266         if (!commit_reflog)
 267                 return;
 268
 269         if (shorten) {
 270                 if (!commit_reflog->reflogs->short_ref)
 271                         commit_reflog->reflogs->short_ref
 272                                 = shorten_unambiguous_ref(commit_reflog->reflogs->ref, 0);
 273                 printed_ref = commit_reflog->reflogs->short_ref;
 274         } else {
 275                 printed_ref = commit_reflog->reflogs->ref;
 276         }
 277
 278         strbuf_addf(sb, "%s@{", printed_ref);
 279         if (commit_reflog->selector == SELECTOR_DATE ||
 280             (commit_reflog->selector == SELECTOR_NONE && force_date)) {
 281                 info = &commit_reflog->reflogs->items[commit_reflog->recno+1];
 282                 strbuf_addstr(sb, show_date(info->timestamp, info->tz, dmode));
 283         } else {
 284                 strbuf_addf(sb, "%d", commit_reflog->reflogs->nr
 285                             - 2 - commit_reflog->recno);
 286         }
 287
 288         strbuf_addch(sb, '}');
 289 }
 290
 291 void get_reflog_message(struct strbuf *sb,
 292                         struct reflog_walk_info *reflog_info)
 293 {
 294         struct commit_reflog *commit_reflog = reflog_info->last_commit_reflog;
 295         struct reflog_info *info;
 296         size_t len;
 297
 298         if (!commit_reflog)
 299                 return;
 300
 301         info = &commit_reflog->reflogs->items[commit_reflog->recno+1];
 302         len = strlen(info->message);
 303         if (len > 0)
 304                 len--; /* strip away trailing newline */
 305         strbuf_add(sb, info->message, len);
 306 }
 307
 308 const char *get_reflog_ident(struct reflog_walk_info *reflog_info)
 309 {
 310         struct commit_reflog *commit_reflog = reflog_info->last_commit_reflog;
 311         struct reflog_info *info;
 312
 313         if (!commit_reflog)
 314                 return NULL;
 315
 316         info = &commit_reflog->reflogs->items[commit_reflog->recno+1];
 317         return info->email;
 318 }
 319
 320 void show_reflog_message(struct reflog_walk_info *reflog_info, int oneline,
 321                          enum date_mode dmode, int force_date)
 322 {
 323         if (reflog_info && reflog_info->last_commit_reflog) {
 324                 struct commit_reflog *commit_reflog = reflog_info->last_commit_reflog;
 325                 struct reflog_info *info;
 326                 struct strbuf selector = STRBUF_INIT;
 327
 328                 info = &commit_reflog->reflogs->items[commit_reflog->recno+1];
 329                 get_reflog_selector(&selector, reflog_info, dmode, force_date, 0);
 330                 if (oneline) {
 331                         printf("%s: %s", selector.buf, info->message);
 332                 }
 333                 else {
 334                         printf("Reflog: %s (%s)\nReflog message: %s",
 335                                selector.buf, info->email, info->message);
 336                 }
 337
 338                 strbuf_release(&selector);
 339         }
 340 }