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 flag, recno;
 130         struct complete_reflogs *reflogs;
 131 };
 132
 133 struct reflog_walk_info {
 134         struct commit_info_lifo reflogs;
 135         struct string_list complete_reflogs;
 136         struct commit_reflog *last_commit_reflog;
 137 };
 138
 139 void init_reflog_walk(struct reflog_walk_info** info)
 140 {
 141         *info = xcalloc(sizeof(struct reflog_walk_info), 1);
 142 }
 143
 144 int add_reflog_for_walk(struct reflog_walk_info *info,
 145                 struct commit *commit, const char *name)
 146 {
 147         unsigned long timestamp = 0;
 148         int recno = -1;
 149         struct string_list_item *item;
 150         struct complete_reflogs *reflogs;
 151         char *branch, *at = strchr(name, '@');
 152         struct commit_reflog *commit_reflog;
 153
 154         if (commit->object.flags & UNINTERESTING)
 155                 die ("Cannot walk reflogs for %s", name);
 156
 157         branch = xstrdup(name);
 158         if (at && at[1] == '{') {
 159                 char *ep;
 160                 branch[at - name] = '\0';
 161                 recno = strtoul(at + 2, &ep, 10);
 162                 if (*ep != '}') {
 163                         recno = -1;
 164                         timestamp = approxidate(at + 2);
 165                 }
 166         } else
 167                 recno = 0;
 168
 169         item = string_list_lookup(&info->complete_reflogs, branch);
 170         if (item)
 171                 reflogs = item->util;
 172         else {
 173                 if (*branch == '\0') {
 174                         unsigned char sha1[20];
 175                         free(branch);
 176                         branch = resolve_refdup("HEAD", sha1, 0, NULL);
 177                         if (!branch)
 178                                 die ("No current branch");
 179
 180                 }
 181                 reflogs = read_complete_reflog(branch);
 182                 if (!reflogs || reflogs->nr == 0) {
 183                         unsigned char sha1[20];
 184                         char *b;
 185                         if (dwim_log(branch, strlen(branch), sha1, &b) == 1) {
 186                                 if (reflogs) {
 187                                         free(reflogs->ref);
 188                                         free(reflogs);
 189                                 }
 190                                 free(branch);
 191                                 branch = b;
 192                                 reflogs = read_complete_reflog(branch);
 193                         }
 194                 }
 195                 if (!reflogs || reflogs->nr == 0)
 196                         return -1;
 197                 string_list_insert(&info->complete_reflogs, branch)->util
 198                         = reflogs;
 199         }
 200
 201         commit_reflog = xcalloc(sizeof(struct commit_reflog), 1);
 202         if (recno < 0) {
 203                 commit_reflog->flag = 1;
 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->reflogs = reflogs;
 213
 214         add_commit_info(commit, commit_reflog, &info->reflogs);
 215         return 0;
 216 }
 217
 218 void fake_reflog_parent(struct reflog_walk_info *info, struct commit *commit)
 219 {
 220         struct commit_info *commit_info =
 221                 get_commit_info(commit, &info->reflogs, 0);
 222         struct commit_reflog *commit_reflog;
 223         struct reflog_info *reflog;
 224
 225         info->last_commit_reflog = NULL;
 226         if (!commit_info)
 227                 return;
 228
 229         commit_reflog = commit_info->util;
 230         if (commit_reflog->recno < 0) {
 231                 commit->parents = NULL;
 232                 return;
 233         }
 234
 235         reflog = &commit_reflog->reflogs->items[commit_reflog->recno];
 236         info->last_commit_reflog = commit_reflog;
 237         commit_reflog->recno--;
 238         commit_info->commit = (struct commit *)parse_object(reflog->osha1);
 239         if (!commit_info->commit) {
 240                 commit->parents = NULL;
 241                 return;
 242         }
 243
 244         commit->parents = xcalloc(sizeof(struct commit_list), 1);
 245         commit->parents->item = commit_info->commit;
 246 }
 247
 248 void get_reflog_selector(struct strbuf *sb,
 249                          struct reflog_walk_info *reflog_info,
 250                          enum date_mode dmode,
 251                          int shorten)
 252 {
 253         struct commit_reflog *commit_reflog = reflog_info->last_commit_reflog;
 254         struct reflog_info *info;
 255         const char *printed_ref;
 256
 257         if (!commit_reflog)
 258                 return;
 259
 260         if (shorten) {
 261                 if (!commit_reflog->reflogs->short_ref)
 262                         commit_reflog->reflogs->short_ref
 263                                 = shorten_unambiguous_ref(commit_reflog->reflogs->ref, 0);
 264                 printed_ref = commit_reflog->reflogs->short_ref;
 265         } else {
 266                 printed_ref = commit_reflog->reflogs->ref;
 267         }
 268
 269         strbuf_addf(sb, "%s@{", printed_ref);
 270         if (commit_reflog->flag || dmode) {
 271                 info = &commit_reflog->reflogs->items[commit_reflog->recno+1];
 272                 strbuf_addstr(sb, show_date(info->timestamp, info->tz, dmode));
 273         } else {
 274                 strbuf_addf(sb, "%d", commit_reflog->reflogs->nr
 275                             - 2 - commit_reflog->recno);
 276         }
 277
 278         strbuf_addch(sb, '}');
 279 }
 280
 281 void get_reflog_message(struct strbuf *sb,
 282                         struct reflog_walk_info *reflog_info)
 283 {
 284         struct commit_reflog *commit_reflog = reflog_info->last_commit_reflog;
 285         struct reflog_info *info;
 286         size_t len;
 287
 288         if (!commit_reflog)
 289                 return;
 290
 291         info = &commit_reflog->reflogs->items[commit_reflog->recno+1];
 292         len = strlen(info->message);
 293         if (len > 0)
 294                 len--; /* strip away trailing newline */
 295         strbuf_add(sb, info->message, len);
 296 }
 297
 298 void show_reflog_message(struct reflog_walk_info *reflog_info, int oneline,
 299         enum date_mode dmode)
 300 {
 301         if (reflog_info && reflog_info->last_commit_reflog) {
 302                 struct commit_reflog *commit_reflog = reflog_info->last_commit_reflog;
 303                 struct reflog_info *info;
 304                 struct strbuf selector = STRBUF_INIT;
 305
 306                 info = &commit_reflog->reflogs->items[commit_reflog->recno+1];
 307                 get_reflog_selector(&selector, reflog_info, dmode, 0);
 308                 if (oneline) {
 309                         printf("%s: %s", selector.buf, info->message);
 310                 }
 311                 else {
 312                         printf("Reflog: %s (%s)\nReflog message: %s",
 313                                selector.buf, info->email, info->message);
 314                 }
 315
 316                 strbuf_release(&selector);
 317         }
 318 }