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 "path-list.h"
   7 #include "reflog-walk.h"
   8
   9 struct complete_reflogs {
  10         char *ref;
  11         struct reflog_info {
  12                 unsigned char osha1[20], nsha1[20];
  13                 char *email;
  14                 unsigned long timestamp;
  15                 int tz;
  16                 char *message;
  17         } *items;
  18         int nr, alloc;
  19 };
  20
  21 static int read_one_reflog(unsigned char *osha1, unsigned char *nsha1,
  22                 const char *email, unsigned long timestamp, int tz,
  23                 const char *message, void *cb_data)
  24 {
  25         struct complete_reflogs *array = cb_data;
  26         struct reflog_info *item;
  27
  28         if (array->nr >= array->alloc) {
  29                 array->alloc = alloc_nr(array->nr + 1);
  30                 array->items = xrealloc(array->items, array->alloc *
  31                         sizeof(struct reflog_info));
  32         }
  33         item = array->items + array->nr;
  34         memcpy(item->osha1, osha1, 20);
  35         memcpy(item->nsha1, nsha1, 20);
  36         item->email = xstrdup(email);
  37         item->timestamp = timestamp;
  38         item->tz = tz;
  39         item->message = xstrdup(message);
  40         array->nr++;
  41         return 0;
  42 }
  43
  44 static struct complete_reflogs *read_complete_reflog(const char *ref)
  45 {
  46         struct complete_reflogs *reflogs =
  47                 xcalloc(sizeof(struct complete_reflogs), 1);
  48         reflogs->ref = xstrdup(ref);
  49         for_each_reflog_ent(ref, read_one_reflog, reflogs);
  50         if (reflogs->nr == 0) {
  51                 unsigned char sha1[20];
  52                 const char *name = resolve_ref(ref, sha1, 1, NULL);
  53                 if (name)
  54                         for_each_reflog_ent(name, read_one_reflog, reflogs);
  55         }
  56         if (reflogs->nr == 0) {
  57                 int len = strlen(ref);
  58                 char *refname = xmalloc(len + 12);
  59                 sprintf(refname, "refs/%s", ref);
  60                 for_each_reflog_ent(refname, read_one_reflog, reflogs);
  61                 if (reflogs->nr == 0) {
  62                         sprintf(refname, "refs/heads/%s", ref);
  63                         for_each_reflog_ent(refname, read_one_reflog, reflogs);
  64                 }
  65                 free(refname);
  66         }
  67         return reflogs;
  68 }
  69
  70 static int get_reflog_recno_by_time(struct complete_reflogs *array,
  71         unsigned long timestamp)
  72 {
  73         int i;
  74         for (i = array->nr - 1; i >= 0; i--)
  75                 if (timestamp >= array->items[i].timestamp)
  76                         return i;
  77         return -1;
  78 }
  79
  80 struct commit_info_lifo {
  81         struct commit_info {
  82                 struct commit *commit;
  83                 void *util;
  84         } *items;
  85         int nr, alloc;
  86 };
  87
  88 static struct commit_info *get_commit_info(struct commit *commit,
  89                 struct commit_info_lifo *lifo, int pop)
  90 {
  91         int i;
  92         for (i = 0; i < lifo->nr; i++)
  93                 if (lifo->items[i].commit == commit) {
  94                         struct commit_info *result = &lifo->items[i];
  95                         if (pop) {
  96                                 if (i + 1 < lifo->nr)
  97                                         memmove(lifo->items + i,
  98                                                 lifo->items + i + 1,
  99                                                 (lifo->nr - i) *
 100                                                 sizeof(struct commit_info));
 101                                 lifo->nr--;
 102                         }
 103                         return result;
 104                 }
 105         return NULL;
 106 }
 107
 108 static void add_commit_info(struct commit *commit, void *util,
 109                 struct commit_info_lifo *lifo)
 110 {
 111         struct commit_info *info;
 112         if (lifo->nr >= lifo->alloc) {
 113                 lifo->alloc = alloc_nr(lifo->nr + 1);
 114                 lifo->items = xrealloc(lifo->items,
 115                         lifo->alloc * sizeof(struct commit_info));
 116         }
 117         info = lifo->items + lifo->nr;
 118         info->commit = commit;
 119         info->util = util;
 120         lifo->nr++;
 121 }
 122
 123 struct commit_reflog {
 124         int flag, recno;
 125         struct complete_reflogs *reflogs;
 126 };
 127
 128 struct reflog_walk_info {
 129         struct commit_info_lifo reflogs;
 130         struct path_list complete_reflogs;
 131         struct commit_reflog *last_commit_reflog;
 132 };
 133
 134 void init_reflog_walk(struct reflog_walk_info** info)
 135 {
 136         *info = xcalloc(sizeof(struct reflog_walk_info), 1);
 137 }
 138
 139 void add_reflog_for_walk(struct reflog_walk_info *info,
 140                 struct commit *commit, const char *name)
 141 {
 142         unsigned long timestamp = 0;
 143         int recno = -1;
 144         struct path_list_item *item;
 145         struct complete_reflogs *reflogs;
 146         char *branch, *at = strchr(name, '@');
 147         struct commit_reflog *commit_reflog;
 148
 149         if (commit->object.flags & UNINTERESTING)
 150                 die ("Cannot walk reflogs for %s", name);
 151
 152         branch = xstrdup(name);
 153         if (at && at[1] == '{') {
 154                 char *ep;
 155                 branch[at - name] = '\0';
 156                 recno = strtoul(at + 2, &ep, 10);
 157                 if (*ep != '}') {
 158                         recno = -1;
 159                         timestamp = approxidate(at + 2);
 160                 }
 161         } else
 162                 recno = 0;
 163
 164         item = path_list_lookup(branch, &info->complete_reflogs);
 165         if (item)
 166                 reflogs = item->util;
 167         else {
 168                 if (*branch == '\0') {
 169                         unsigned char sha1[20];
 170                         const char *head = resolve_ref("HEAD", sha1, 0, NULL);
 171                         if (!head)
 172                                 die ("No current branch");
 173                         free(branch);
 174                         branch = xstrdup(head);
 175                 }
 176                 reflogs = read_complete_reflog(branch);
 177                 if (!reflogs || reflogs->nr == 0)
 178                         die("No reflogs found for '%s'", branch);
 179                 path_list_insert(branch, &info->complete_reflogs)->util
 180                         = reflogs;
 181         }
 182
 183         commit_reflog = xcalloc(sizeof(struct commit_reflog), 1);
 184         if (recno < 0) {
 185                 commit_reflog->flag = 1;
 186                 commit_reflog->recno = get_reflog_recno_by_time(reflogs, timestamp);
 187                 if (commit_reflog->recno < 0) {
 188                         free(branch);
 189                         free(commit_reflog);
 190                         return;
 191                 }
 192         } else
 193                 commit_reflog->recno = reflogs->nr - recno - 1;
 194         commit_reflog->reflogs = reflogs;
 195
 196         add_commit_info(commit, commit_reflog, &info->reflogs);
 197 }
 198
 199 void fake_reflog_parent(struct reflog_walk_info *info, struct commit *commit)
 200 {
 201         struct commit_info *commit_info =
 202                 get_commit_info(commit, &info->reflogs, 0);
 203         struct commit_reflog *commit_reflog;
 204         struct reflog_info *reflog;
 205
 206         info->last_commit_reflog = NULL;
 207         if (!commit_info)
 208                 return;
 209
 210         commit_reflog = commit_info->util;
 211         if (commit_reflog->recno < 0) {
 212                 commit->parents = NULL;
 213                 return;
 214         }
 215
 216         reflog = &commit_reflog->reflogs->items[commit_reflog->recno];
 217         info->last_commit_reflog = commit_reflog;
 218         commit_reflog->recno--;
 219         commit_info->commit = (struct commit *)parse_object(reflog->osha1);
 220         if (!commit_info->commit) {
 221                 commit->parents = NULL;
 222                 return;
 223         }
 224
 225         commit->parents = xcalloc(sizeof(struct commit_list), 1);
 226         commit->parents->item = commit_info->commit;
 227         commit->object.flags &= ~(ADDED | SEEN | SHOWN);
 228 }
 229
 230 void show_reflog_message(struct reflog_walk_info* info, int oneline)
 231 {
 232         if (info && info->last_commit_reflog) {
 233                 struct commit_reflog *commit_reflog = info->last_commit_reflog;
 234                 struct reflog_info *info;
 235
 236                 info = &commit_reflog->reflogs->items[commit_reflog->recno+1];
 237                 if (oneline) {
 238                         printf("%s@{", commit_reflog->reflogs->ref);
 239                         if (commit_reflog->flag)
 240                                 printf("%s", show_date(info->timestamp, 0, 1));
 241                         else
 242                                 printf("%d", commit_reflog->reflogs->nr
 243                                        - 2 - commit_reflog->recno);
 244                         printf("}: %s", info->message);
 245                 }
 246                 else {
 247                         printf("Reflog: %s@{", commit_reflog->reflogs->ref);
 248                         if (commit_reflog->flag)
 249                                 printf("%s", show_rfc2822_date(info->timestamp,
 250                                                                info->tz));
 251                         else
 252                                 printf("%d", commit_reflog->reflogs->nr
 253                                        - 2 - commit_reflog->recno);
 254                         printf("} (%s)\nReflog message: %s",
 255                                info->email, info->message);
 256                 }
 257         }
 258 }