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, sha1, 1, NULL);
  52                 if (name) {
  53                         for_each_reflog_ent(name, read_one_reflog, reflogs);
  54                         free(name_to_free);
  55                 }
  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         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", sha1, 0, 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 reflog_info *reflog;
 225
 226         info->last_commit_reflog = NULL;
 227         if (!commit_info)
 228                 return;
 229
 230         commit_reflog = commit_info->util;
 231         if (commit_reflog->recno < 0) {
 232                 commit->parents = NULL;
 233                 return;
 234         }
 235
 236         reflog = &commit_reflog->reflogs->items[commit_reflog->recno];
 237         info->last_commit_reflog = commit_reflog;
 238         commit_reflog->recno--;
 239         commit_info->commit = (struct commit *)parse_object(reflog->osha1);
 240         if (!commit_info->commit) {
 241                 commit->parents = NULL;
 242                 return;
 243         }
 244
 245         commit->parents = xcalloc(1, sizeof(struct commit_list));
 246         commit->parents->item = commit_info->commit;
 247 }
 248
 249 void get_reflog_selector(struct strbuf *sb,
 250                          struct reflog_walk_info *reflog_info,
 251                          enum date_mode dmode, int force_date,
 252                          int shorten)
 253 {
 254         struct commit_reflog *commit_reflog = reflog_info->last_commit_reflog;
 255         struct reflog_info *info;
 256         const char *printed_ref;
 257
 258         if (!commit_reflog)
 259                 return;
 260
 261         if (shorten) {
 262                 if (!commit_reflog->reflogs->short_ref)
 263                         commit_reflog->reflogs->short_ref
 264                                 = shorten_unambiguous_ref(commit_reflog->reflogs->ref, 0);
 265                 printed_ref = commit_reflog->reflogs->short_ref;
 266         } else {
 267                 printed_ref = commit_reflog->reflogs->ref;
 268         }
 269
 270         strbuf_addf(sb, "%s@{", printed_ref);
 271         if (commit_reflog->selector == SELECTOR_DATE ||
 272             (commit_reflog->selector == SELECTOR_NONE && force_date)) {
 273                 info = &commit_reflog->reflogs->items[commit_reflog->recno+1];
 274                 strbuf_addstr(sb, show_date(info->timestamp, info->tz, dmode));
 275         } else {
 276                 strbuf_addf(sb, "%d", commit_reflog->reflogs->nr
 277                             - 2 - commit_reflog->recno);
 278         }
 279
 280         strbuf_addch(sb, '}');
 281 }
 282
 283 void get_reflog_message(struct strbuf *sb,
 284                         struct reflog_walk_info *reflog_info)
 285 {
 286         struct commit_reflog *commit_reflog = reflog_info->last_commit_reflog;
 287         struct reflog_info *info;
 288         size_t len;
 289
 290         if (!commit_reflog)
 291                 return;
 292
 293         info = &commit_reflog->reflogs->items[commit_reflog->recno+1];
 294         len = strlen(info->message);
 295         if (len > 0)
 296                 len--; /* strip away trailing newline */
 297         strbuf_add(sb, info->message, len);
 298 }
 299
 300 const char *get_reflog_ident(struct reflog_walk_info *reflog_info)
 301 {
 302         struct commit_reflog *commit_reflog = reflog_info->last_commit_reflog;
 303         struct reflog_info *info;
 304
 305         if (!commit_reflog)
 306                 return NULL;
 307
 308         info = &commit_reflog->reflogs->items[commit_reflog->recno+1];
 309         return info->email;
 310 }
 311
 312 void show_reflog_message(struct reflog_walk_info *reflog_info, int oneline,
 313                          enum date_mode dmode, int force_date)
 314 {
 315         if (reflog_info && reflog_info->last_commit_reflog) {
 316                 struct commit_reflog *commit_reflog = reflog_info->last_commit_reflog;
 317                 struct reflog_info *info;
 318                 struct strbuf selector = STRBUF_INIT;
 319
 320                 info = &commit_reflog->reflogs->items[commit_reflog->recno+1];
 321                 get_reflog_selector(&selector, reflog_info, dmode, force_date, 0);
 322                 if (oneline) {
 323                         printf("%s: %s", selector.buf, info->message);
 324                 }
 325                 else {
 326                         printf("Reflog: %s (%s)\nReflog message: %s",
 327                                selector.buf, info->email, info->message);
 328                 }
 329
 330                 strbuf_release(&selector);
 331         }
 332 }