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         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 string_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 int 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 string_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 = string_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                         unsigned char sha1[20];
 179                         char *b;
 180                         if (dwim_log(branch, strlen(branch), sha1, &b) == 1) {
 181                                 if (reflogs) {
 182                                         free(reflogs->ref);
 183                                         free(reflogs);
 184                                 }
 185                                 free(branch);
 186                                 branch = b;
 187                                 reflogs = read_complete_reflog(branch);
 188                         }
 189                 }
 190                 if (!reflogs || reflogs->nr == 0)
 191                         return -1;
 192                 string_list_insert(branch, &info->complete_reflogs)->util
 193                         = reflogs;
 194         }
 195
 196         commit_reflog = xcalloc(sizeof(struct commit_reflog), 1);
 197         if (recno < 0) {
 198                 commit_reflog->flag = 1;
 199                 commit_reflog->recno = get_reflog_recno_by_time(reflogs, timestamp);
 200                 if (commit_reflog->recno < 0) {
 201                         free(branch);
 202                         free(commit_reflog);
 203                         return -1;
 204                 }
 205         } else
 206                 commit_reflog->recno = reflogs->nr - recno - 1;
 207         commit_reflog->reflogs = reflogs;
 208
 209         add_commit_info(commit, commit_reflog, &info->reflogs);
 210         return 0;
 211 }
 212
 213 void fake_reflog_parent(struct reflog_walk_info *info, struct commit *commit)
 214 {
 215         struct commit_info *commit_info =
 216                 get_commit_info(commit, &info->reflogs, 0);
 217         struct commit_reflog *commit_reflog;
 218         struct reflog_info *reflog;
 219
 220         info->last_commit_reflog = NULL;
 221         if (!commit_info)
 222                 return;
 223
 224         commit_reflog = commit_info->util;
 225         if (commit_reflog->recno < 0) {
 226                 commit->parents = NULL;
 227                 return;
 228         }
 229
 230         reflog = &commit_reflog->reflogs->items[commit_reflog->recno];
 231         info->last_commit_reflog = commit_reflog;
 232         commit_reflog->recno--;
 233         commit_info->commit = (struct commit *)parse_object(reflog->osha1);
 234         if (!commit_info->commit) {
 235                 commit->parents = NULL;
 236                 return;
 237         }
 238
 239         commit->parents = xcalloc(sizeof(struct commit_list), 1);
 240         commit->parents->item = commit_info->commit;
 241         commit->object.flags &= ~(ADDED | SEEN | SHOWN);
 242 }
 243
 244 void show_reflog_message(struct reflog_walk_info *info, int oneline,
 245         enum date_mode dmode)
 246 {
 247         if (info && info->last_commit_reflog) {
 248                 struct commit_reflog *commit_reflog = info->last_commit_reflog;
 249                 struct reflog_info *info;
 250
 251                 info = &commit_reflog->reflogs->items[commit_reflog->recno+1];
 252                 if (oneline) {
 253                         printf("%s@{", commit_reflog->reflogs->ref);
 254                         if (commit_reflog->flag || dmode)
 255                                 printf("%s", show_date(info->timestamp,
 256                                                        info->tz,
 257                                                        dmode));
 258                         else
 259                                 printf("%d", commit_reflog->reflogs->nr
 260                                        - 2 - commit_reflog->recno);
 261                         printf("}: %s", info->message);
 262                 }
 263                 else {
 264                         printf("Reflog: %s@{", commit_reflog->reflogs->ref);
 265                         if (commit_reflog->flag || dmode)
 266                                 printf("%s", show_date(info->timestamp,
 267                                                         info->tz,
 268                                                         dmode));
 269                         else
 270                                 printf("%d", commit_reflog->reflogs->nr
 271                                        - 2 - commit_reflog->recno);
 272                         printf("} (%s)\nReflog message: %s",
 273                                info->email, info->message);
 274                 }
 275         }
 276 }