Andrew's git - gitweb.git/blob

   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
   9struct 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
  22static 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
  45static 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 = resolve_ref(ref, sha1, 1, NULL);
  54                if (name) {
  55                        name = xstrdup(name);
  56                        for_each_reflog_ent(name, read_one_reflog, reflogs);
  57                        free((char *)name);
  58                }
  59        }
  60        if (reflogs->nr == 0) {
  61                int len = strlen(ref);
  62                char *refname = xmalloc(len + 12);
  63                sprintf(refname, "refs/%s", ref);
  64                for_each_reflog_ent(refname, read_one_reflog, reflogs);
  65                if (reflogs->nr == 0) {
  66                        sprintf(refname, "refs/heads/%s", ref);
  67                        for_each_reflog_ent(refname, read_one_reflog, reflogs);
  68                }
  69                free(refname);
  70        }
  71        return reflogs;
  72}
  73
  74static int get_reflog_recno_by_time(struct complete_reflogs *array,
  75        unsigned long timestamp)
  76{
  77        int i;
  78        for (i = array->nr - 1; i >= 0; i--)
  79                if (timestamp >= array->items[i].timestamp)
  80                        return i;
  81        return -1;
  82}
  83
  84struct commit_info_lifo {
  85        struct commit_info {
  86                struct commit *commit;
  87                void *util;
  88        } *items;
  89        int nr, alloc;
  90};
  91
  92static struct commit_info *get_commit_info(struct commit *commit,
  93                struct commit_info_lifo *lifo, int pop)
  94{
  95        int i;
  96        for (i = 0; i < lifo->nr; i++)
  97                if (lifo->items[i].commit == commit) {
  98                        struct commit_info *result = &lifo->items[i];
  99                        if (pop) {
 100                                if (i + 1 < lifo->nr)
 101                                        memmove(lifo->items + i,
 102                                                lifo->items + i + 1,
 103                                                (lifo->nr - i) *
 104                                                sizeof(struct commit_info));
 105                                lifo->nr--;
 106                        }
 107                        return result;
 108                }
 109        return NULL;
 110}
 111
 112static void add_commit_info(struct commit *commit, void *util,
 113                struct commit_info_lifo *lifo)
 114{
 115        struct commit_info *info;
 116        if (lifo->nr >= lifo->alloc) {
 117                lifo->alloc = alloc_nr(lifo->nr + 1);
 118                lifo->items = xrealloc(lifo->items,
 119                        lifo->alloc * sizeof(struct commit_info));
 120        }
 121        info = lifo->items + lifo->nr;
 122        info->commit = commit;
 123        info->util = util;
 124        lifo->nr++;
 125}
 126
 127struct commit_reflog {
 128        int flag, recno;
 129        struct complete_reflogs *reflogs;
 130};
 131
 132struct reflog_walk_info {
 133        struct commit_info_lifo reflogs;
 134        struct string_list complete_reflogs;
 135        struct commit_reflog *last_commit_reflog;
 136};
 137
 138void init_reflog_walk(struct reflog_walk_info** info)
 139{
 140        *info = xcalloc(sizeof(struct reflog_walk_info), 1);
 141}
 142
 143int add_reflog_for_walk(struct reflog_walk_info *info,
 144                struct commit *commit, const char *name)
 145{
 146        unsigned long timestamp = 0;
 147        int recno = -1;
 148        struct string_list_item *item;
 149        struct complete_reflogs *reflogs;
 150        char *branch, *at = strchr(name, '@');
 151        struct commit_reflog *commit_reflog;
 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                }
 165        } else
 166                recno = 0;
 167
 168        item = string_list_lookup(&info->complete_reflogs, branch);
 169        if (item)
 170                reflogs = item->util;
 171        else {
 172                if (*branch == '\0') {
 173                        unsigned char sha1[20];
 174                        const char *head = resolve_ref("HEAD", sha1, 0, NULL);
 175                        if (!head)
 176                                die ("No current branch");
 177                        free(branch);
 178                        branch = xstrdup(head);
 179                }
 180                reflogs = read_complete_reflog(branch);
 181                if (!reflogs || reflogs->nr == 0) {
 182                        unsigned char sha1[20];
 183                        char *b;
 184                        if (dwim_log(branch, strlen(branch), sha1, &b) == 1) {
 185                                if (reflogs) {
 186                                        free(reflogs->ref);
 187                                        free(reflogs);
 188                                }
 189                                free(branch);
 190                                branch = b;
 191                                reflogs = read_complete_reflog(branch);
 192                        }
 193                }
 194                if (!reflogs || reflogs->nr == 0)
 195                        return -1;
 196                string_list_insert(&info->complete_reflogs, branch)->util
 197                        = reflogs;
 198        }
 199
 200        commit_reflog = xcalloc(sizeof(struct commit_reflog), 1);
 201        if (recno < 0) {
 202                commit_reflog->flag = 1;
 203                commit_reflog->recno = get_reflog_recno_by_time(reflogs, timestamp);
 204                if (commit_reflog->recno < 0) {
 205                        free(branch);
 206                        free(commit_reflog);
 207                        return -1;
 208                }
 209        } else
 210                commit_reflog->recno = reflogs->nr - recno - 1;
 211        commit_reflog->reflogs = reflogs;
 212
 213        add_commit_info(commit, commit_reflog, &info->reflogs);
 214        return 0;
 215}
 216
 217void fake_reflog_parent(struct reflog_walk_info *info, struct commit *commit)
 218{
 219        struct commit_info *commit_info =
 220                get_commit_info(commit, &info->reflogs, 0);
 221        struct commit_reflog *commit_reflog;
 222        struct reflog_info *reflog;
 223
 224        info->last_commit_reflog = NULL;
 225        if (!commit_info)
 226                return;
 227
 228        commit_reflog = commit_info->util;
 229        if (commit_reflog->recno < 0) {
 230                commit->parents = NULL;
 231                return;
 232        }
 233
 234        reflog = &commit_reflog->reflogs->items[commit_reflog->recno];
 235        info->last_commit_reflog = commit_reflog;
 236        commit_reflog->recno--;
 237        commit_info->commit = (struct commit *)parse_object(reflog->osha1);
 238        if (!commit_info->commit) {
 239                commit->parents = NULL;
 240                return;
 241        }
 242
 243        commit->parents = xcalloc(sizeof(struct commit_list), 1);
 244        commit->parents->item = commit_info->commit;
 245}
 246
 247void get_reflog_selector(struct strbuf *sb,
 248                         struct reflog_walk_info *reflog_info,
 249                         enum date_mode dmode,
 250                         int shorten)
 251{
 252        struct commit_reflog *commit_reflog = reflog_info->last_commit_reflog;
 253        struct reflog_info *info;
 254        const char *printed_ref;
 255
 256        if (!commit_reflog)
 257                return;
 258
 259        if (shorten) {
 260                if (!commit_reflog->reflogs->short_ref)
 261                        commit_reflog->reflogs->short_ref
 262                                = shorten_unambiguous_ref(commit_reflog->reflogs->ref, 0);
 263                printed_ref = commit_reflog->reflogs->short_ref;
 264        } else {
 265                printed_ref = commit_reflog->reflogs->ref;
 266        }
 267
 268        strbuf_addf(sb, "%s@{", printed_ref);
 269        if (commit_reflog->flag || dmode) {
 270                info = &commit_reflog->reflogs->items[commit_reflog->recno+1];
 271                strbuf_addstr(sb, show_date(info->timestamp, info->tz, dmode));
 272        } else {
 273                strbuf_addf(sb, "%d", commit_reflog->reflogs->nr
 274                            - 2 - commit_reflog->recno);
 275        }
 276
 277        strbuf_addch(sb, '}');
 278}
 279
 280void get_reflog_message(struct strbuf *sb,
 281                        struct reflog_walk_info *reflog_info)
 282{
 283        struct commit_reflog *commit_reflog = reflog_info->last_commit_reflog;
 284        struct reflog_info *info;
 285        size_t len;
 286
 287        if (!commit_reflog)
 288                return;
 289
 290        info = &commit_reflog->reflogs->items[commit_reflog->recno+1];
 291        len = strlen(info->message);
 292        if (len > 0)
 293                len--; /* strip away trailing newline */
 294        strbuf_add(sb, info->message, len);
 295}
 296
 297void show_reflog_message(struct reflog_walk_info *reflog_info, int oneline,
 298        enum date_mode dmode)
 299{
 300        if (reflog_info && reflog_info->last_commit_reflog) {
 301                struct commit_reflog *commit_reflog = reflog_info->last_commit_reflog;
 302                struct reflog_info *info;
 303                struct strbuf selector = STRBUF_INIT;
 304
 305                info = &commit_reflog->reflogs->items[commit_reflog->recno+1];
 306                get_reflog_selector(&selector, reflog_info, dmode, 0);
 307                if (oneline) {
 308                        printf("%s: %s", selector.buf, info->message);
 309                }
 310                else {
 311                        printf("Reflog: %s (%s)\nReflog message: %s",
 312                               selector.buf, info->email, info->message);
 313                }
 314
 315                strbuf_release(&selector);
 316        }
 317}