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