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
   8 struct complete_reflogs {
   9         char *ref;
  10         struct reflog_info {
  11                 unsigned char osha1[20], nsha1[20];
  12                 char *email;
  13                 unsigned long timestamp;
  14                 int tz;
  15                 char *message;
  16         } *items;
  17         int nr, alloc;
  18 };
  19
  20 static int read_one_reflog(unsigned char *osha1, unsigned char *nsha1,
  21                 const char *email, unsigned long timestamp, int tz,
  22                 const char *message, void *cb_data)
  23 {
  24         struct complete_reflogs *array = cb_data;
  25         struct reflog_info *item;
  26
  27         if (array->nr >= array->alloc) {
  28                 array->alloc = alloc_nr(array->nr + 1);
  29                 array->items = xrealloc(array->items, array->alloc *
  30                         sizeof(struct reflog_info));
  31         }
  32         item = array->items + array->nr;
  33         memcpy(item->osha1, osha1, 20);
  34         memcpy(item->nsha1, nsha1, 20);
  35         item->email = xstrdup(email);
  36         item->timestamp = timestamp;
  37         item->tz = tz;
  38         item->message = xstrdup(message);
  39         array->nr++;
  40         return 0;
  41 }
  42
  43 static struct complete_reflogs *read_complete_reflog(const char *ref)
  44 {
  45         struct complete_reflogs *reflogs =
  46                 xcalloc(sizeof(struct complete_reflogs), 1);
  47         reflogs->ref = xstrdup(ref);
  48         for_each_reflog_ent(ref, read_one_reflog, reflogs);
  49         if (reflogs->nr == 0) {
  50                 unsigned char sha1[20];
  51                 const char *name = resolve_ref(ref, sha1, 1, NULL);
  52                 if (name)
  53                         for_each_reflog_ent(name, read_one_reflog, reflogs);
  54         }
  55         if (reflogs->nr == 0) {
  56                 int len = strlen(ref);
  57                 char *refname = xmalloc(len + 12);
  58                 sprintf(refname, "refs/%s", ref);
  59                 for_each_reflog_ent(refname, read_one_reflog, reflogs);
  60                 if (reflogs->nr == 0) {
  61                         sprintf(refname, "refs/heads/%s", ref);
  62                         for_each_reflog_ent(refname, read_one_reflog, reflogs);
  63                 }
  64                 free(refname);
  65         }
  66         return reflogs;
  67 }
  68
  69 static int get_reflog_recno_by_time(struct complete_reflogs *array,
  70         unsigned long timestamp)
  71 {
  72         int i;
  73         for (i = array->nr - 1; i >= 0; i++)
  74                 if (timestamp >= array->items[i].timestamp)
  75                         return i;
  76         return -1;
  77 }
  78
  79 struct commit_info_lifo {
  80         struct commit_info {
  81                 struct commit *commit;
  82                 void *util;
  83         } *items;
  84         int nr, alloc;
  85 };
  86
  87 static struct commit_info *get_commit_info(struct commit *commit,
  88                 struct commit_info_lifo *lifo, int pop)
  89 {
  90         int i;
  91         for (i = 0; i < lifo->nr; i++)
  92                 if (lifo->items[i].commit == commit) {
  93                         struct commit_info *result = &lifo->items[i];
  94                         if (pop) {
  95                                 if (i + 1 < lifo->nr)
  96                                         memmove(lifo->items + i,
  97                                                 lifo->items + i + 1,
  98                                                 (lifo->nr - i) *
  99                                                 sizeof(struct commit_info));
 100                                 lifo->nr--;
 101                         }
 102                         return result;
 103                 }
 104         return NULL;
 105 }
 106
 107 static void add_commit_info(struct commit *commit, void *util,
 108                 struct commit_info_lifo *lifo)
 109 {
 110         struct commit_info *info;
 111         if (lifo->nr >= lifo->alloc) {
 112                 lifo->alloc = alloc_nr(lifo->nr + 1);
 113                 lifo->items = xrealloc(lifo->items,
 114                         lifo->alloc * sizeof(struct commit_info));
 115         }
 116         info = lifo->items + lifo->nr;
 117         info->commit = commit;
 118         info->util = util;
 119         lifo->nr++;
 120 }
 121
 122 struct commit_reflog {
 123         int flag, recno;
 124         struct complete_reflogs *reflogs;
 125 };
 126
 127 struct reflog_walk_info {
 128         struct commit_info_lifo reflogs;
 129         struct path_list complete_reflogs;
 130         struct commit_reflog *last_commit_reflog;
 131 };
 132
 133 void init_reflog_walk(struct reflog_walk_info** info)
 134 {
 135         *info = xcalloc(sizeof(struct reflog_walk_info), 1);
 136 }
 137
 138 void add_reflog_for_walk(struct reflog_walk_info *info,
 139                 struct commit *commit, const char *name)
 140 {
 141         unsigned long timestamp = 0;
 142         int recno = -1;
 143         struct path_list_item *item;
 144         struct complete_reflogs *reflogs;
 145         char *branch, *at = strchr(name, '@');
 146         struct commit_reflog *commit_reflog;
 147
 148         branch = xstrdup(name);
 149         if (at && at[1] == '{') {
 150                 char *ep;
 151                 branch[at - name] = '\0';
 152                 recno = strtoul(at + 2, &ep, 10);
 153                 if (*ep != '}') {
 154                         recno = -1;
 155                         timestamp = approxidate(at + 2);
 156                 }
 157         } else
 158                 recno = 0;
 159
 160         item = path_list_lookup(branch, &info->complete_reflogs);
 161         if (item)
 162                 reflogs = item->util;
 163         else {
 164                 reflogs = read_complete_reflog(branch);
 165                 if (!reflogs || reflogs->nr == 0)
 166                         die("No reflogs found for '%s'", branch);
 167                 path_list_insert(branch, &info->complete_reflogs)->util
 168                         = reflogs;
 169         }
 170
 171         commit_reflog = xcalloc(sizeof(struct commit_reflog), 1);
 172         if (recno < 0) {
 173                 commit_reflog->flag = 1;
 174                 commit_reflog->recno = get_reflog_recno_by_time(reflogs, timestamp);
 175                 if (commit_reflog->recno < 0) {
 176                         free(branch);
 177                         free(commit_reflog);
 178                         return;
 179                 }
 180         } else
 181                 commit_reflog->recno = reflogs->nr - recno - 1;
 182         commit_reflog->reflogs = reflogs;
 183
 184         add_commit_info(commit, commit_reflog, &info->reflogs);
 185 }
 186
 187 void fake_reflog_parent(struct reflog_walk_info *info, struct commit *commit)
 188 {
 189         struct commit_info *commit_info =
 190                 get_commit_info(commit, &info->reflogs, 0);
 191         struct commit_reflog *commit_reflog;
 192         struct reflog_info *reflog;
 193
 194         info->last_commit_reflog = NULL;
 195         if (!commit_info)
 196                 return;
 197
 198         commit_reflog = commit_info->util;
 199         if (commit_reflog->recno < 0) {
 200                 commit->parents = NULL;
 201                 return;
 202         }
 203
 204         reflog = &commit_reflog->reflogs->items[commit_reflog->recno];
 205         info->last_commit_reflog = commit_reflog;
 206         commit_reflog->recno--;
 207         commit_info->commit = (struct commit *)parse_object(reflog->osha1);
 208         if (!commit_info->commit) {
 209                 commit->parents = NULL;
 210                 return;
 211         }
 212
 213         commit->parents = xcalloc(sizeof(struct commit_list), 1);
 214         commit->parents->item = commit_info->commit;
 215         commit->object.flags &= ~(ADDED | SEEN | SHOWN);
 216 }
 217
 218 void show_reflog_message(struct reflog_walk_info* info)
 219 {
 220         if (info && info->last_commit_reflog) {
 221                 struct commit_reflog *commit_reflog = info->last_commit_reflog;
 222                 struct reflog_info *info;
 223
 224                 printf("Reflog: %s@{", commit_reflog->reflogs->ref);
 225                 info = &commit_reflog->reflogs->items[commit_reflog->recno + 1];
 226                 if (commit_reflog->flag)
 227                         printf("%s", show_rfc2822_date(info->timestamp,
 228                                                 info->tz));
 229                 else
 230                         printf("%d", commit_reflog->reflogs->nr
 231                                         - 2 - commit_reflog->recno);
 232                 printf("} (%s)\nReflog message: %s",
 233                         info->email, info->message);
 234         }
 235 }