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