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                        for_each_reflog_ent(name, read_one_reflog, reflogs);
  56        }
  57        if (reflogs->nr == 0) {
  58                int len = strlen(ref);
  59                char *refname = xmalloc(len + 12);
  60                sprintf(refname, "refs/%s", ref);
  61                for_each_reflog_ent(refname, read_one_reflog, reflogs);
  62                if (reflogs->nr == 0) {
  63                        sprintf(refname, "refs/heads/%s", ref);
  64                        for_each_reflog_ent(refname, read_one_reflog, reflogs);
  65                }
  66                free(refname);
  67        }
  68        return reflogs;
  69}
  70
  71static int get_reflog_recno_by_time(struct complete_reflogs *array,
  72        unsigned long timestamp)
  73{
  74        int i;
  75        for (i = array->nr - 1; i >= 0; i--)
  76                if (timestamp >= array->items[i].timestamp)
  77                        return i;
  78        return -1;
  79}
  80
  81struct commit_info_lifo {
  82        struct commit_info {
  83                struct commit *commit;
  84                void *util;
  85        } *items;
  86        int nr, alloc;
  87};
  88
  89static struct commit_info *get_commit_info(struct commit *commit,
  90                struct commit_info_lifo *lifo, int pop)
  91{
  92        int i;
  93        for (i = 0; i < lifo->nr; i++)
  94                if (lifo->items[i].commit == commit) {
  95                        struct commit_info *result = &lifo->items[i];
  96                        if (pop) {
  97                                if (i + 1 < lifo->nr)
  98                                        memmove(lifo->items + i,
  99                                                lifo->items + i + 1,
 100                                                (lifo->nr - i) *
 101                                                sizeof(struct commit_info));
 102                                lifo->nr--;
 103                        }
 104                        return result;
 105                }
 106        return NULL;
 107}
 108
 109static void add_commit_info(struct commit *commit, void *util,
 110                struct commit_info_lifo *lifo)
 111{
 112        struct commit_info *info;
 113        if (lifo->nr >= lifo->alloc) {
 114                lifo->alloc = alloc_nr(lifo->nr + 1);
 115                lifo->items = xrealloc(lifo->items,
 116                        lifo->alloc * sizeof(struct commit_info));
 117        }
 118        info = lifo->items + lifo->nr;
 119        info->commit = commit;
 120        info->util = util;
 121        lifo->nr++;
 122}
 123
 124struct commit_reflog {
 125        int flag, recno;
 126        struct complete_reflogs *reflogs;
 127};
 128
 129struct reflog_walk_info {
 130        struct commit_info_lifo reflogs;
 131        struct string_list complete_reflogs;
 132        struct commit_reflog *last_commit_reflog;
 133};
 134
 135void init_reflog_walk(struct reflog_walk_info** info)
 136{
 137        *info = xcalloc(sizeof(struct reflog_walk_info), 1);
 138}
 139
 140int add_reflog_for_walk(struct reflog_walk_info *info,
 141                struct commit *commit, const char *name)
 142{
 143        unsigned long timestamp = 0;
 144        int recno = -1;
 145        struct string_list_item *item;
 146        struct complete_reflogs *reflogs;
 147        char *branch, *at = strchr(name, '@');
 148        struct commit_reflog *commit_reflog;
 149
 150        if (commit->object.flags & UNINTERESTING)
 151                die ("Cannot walk reflogs for %s", name);
 152
 153        branch = xstrdup(name);
 154        if (at && at[1] == '{') {
 155                char *ep;
 156                branch[at - name] = '\0';
 157                recno = strtoul(at + 2, &ep, 10);
 158                if (*ep != '}') {
 159                        recno = -1;
 160                        timestamp = approxidate(at + 2);
 161                }
 162        } else
 163                recno = 0;
 164
 165        item = string_list_lookup(&info->complete_reflogs, branch);
 166        if (item)
 167                reflogs = item->util;
 168        else {
 169                if (*branch == '\0') {
 170                        unsigned char sha1[20];
 171                        const char *head = resolve_ref("HEAD", sha1, 0, NULL);
 172                        if (!head)
 173                                die ("No current branch");
 174                        free(branch);
 175                        branch = xstrdup(head);
 176                }
 177                reflogs = read_complete_reflog(branch);
 178                if (!reflogs || reflogs->nr == 0) {
 179                        unsigned char sha1[20];
 180                        char *b;
 181                        if (dwim_log(branch, strlen(branch), sha1, &b) == 1) {
 182                                if (reflogs) {
 183                                        free(reflogs->ref);
 184                                        free(reflogs);
 185                                }
 186                                free(branch);
 187                                branch = b;
 188                                reflogs = read_complete_reflog(branch);
 189                        }
 190                }
 191                if (!reflogs || reflogs->nr == 0)
 192                        return -1;
 193                string_list_insert(&info->complete_reflogs, branch)->util
 194                        = reflogs;
 195        }
 196
 197        commit_reflog = xcalloc(sizeof(struct commit_reflog), 1);
 198        if (recno < 0) {
 199                commit_reflog->flag = 1;
 200                commit_reflog->recno = get_reflog_recno_by_time(reflogs, timestamp);
 201                if (commit_reflog->recno < 0) {
 202                        free(branch);
 203                        free(commit_reflog);
 204                        return -1;
 205                }
 206        } else
 207                commit_reflog->recno = reflogs->nr - recno - 1;
 208        commit_reflog->reflogs = reflogs;
 209
 210        add_commit_info(commit, commit_reflog, &info->reflogs);
 211        return 0;
 212}
 213
 214void fake_reflog_parent(struct reflog_walk_info *info, struct commit *commit)
 215{
 216        struct commit_info *commit_info =
 217                get_commit_info(commit, &info->reflogs, 0);
 218        struct commit_reflog *commit_reflog;
 219        struct reflog_info *reflog;
 220
 221        info->last_commit_reflog = NULL;
 222        if (!commit_info)
 223                return;
 224
 225        commit_reflog = commit_info->util;
 226        if (commit_reflog->recno < 0) {
 227                commit->parents = NULL;
 228                return;
 229        }
 230
 231        reflog = &commit_reflog->reflogs->items[commit_reflog->recno];
 232        info->last_commit_reflog = commit_reflog;
 233        commit_reflog->recno--;
 234        commit_info->commit = (struct commit *)parse_object(reflog->osha1);
 235        if (!commit_info->commit) {
 236                commit->parents = NULL;
 237                return;
 238        }
 239
 240        commit->parents = xcalloc(sizeof(struct commit_list), 1);
 241        commit->parents->item = commit_info->commit;
 242}
 243
 244void get_reflog_selector(struct strbuf *sb,
 245                         struct reflog_walk_info *reflog_info,
 246                         enum date_mode dmode,
 247                         int shorten)
 248{
 249        struct commit_reflog *commit_reflog = reflog_info->last_commit_reflog;
 250        struct reflog_info *info;
 251        const char *printed_ref;
 252
 253        if (!commit_reflog)
 254                return;
 255
 256        if (shorten) {
 257                if (!commit_reflog->reflogs->short_ref)
 258                        commit_reflog->reflogs->short_ref
 259                                = shorten_unambiguous_ref(commit_reflog->reflogs->ref, 0);
 260                printed_ref = commit_reflog->reflogs->short_ref;
 261        } else {
 262                printed_ref = commit_reflog->reflogs->ref;
 263        }
 264
 265        strbuf_addf(sb, "%s@{", printed_ref);
 266        if (commit_reflog->flag || dmode) {
 267                info = &commit_reflog->reflogs->items[commit_reflog->recno+1];
 268                strbuf_addstr(sb, show_date(info->timestamp, info->tz, dmode));
 269        } else {
 270                strbuf_addf(sb, "%d", commit_reflog->reflogs->nr
 271                            - 2 - commit_reflog->recno);
 272        }
 273
 274        strbuf_addch(sb, '}');
 275}
 276
 277void get_reflog_message(struct strbuf *sb,
 278                        struct reflog_walk_info *reflog_info)
 279{
 280        struct commit_reflog *commit_reflog = reflog_info->last_commit_reflog;
 281        struct reflog_info *info;
 282        size_t len;
 283
 284        if (!commit_reflog)
 285                return;
 286
 287        info = &commit_reflog->reflogs->items[commit_reflog->recno+1];
 288        len = strlen(info->message);
 289        if (len > 0)
 290                len--; /* strip away trailing newline */
 291        strbuf_add(sb, info->message, len);
 292}
 293
 294void show_reflog_message(struct reflog_walk_info *reflog_info, int oneline,
 295        enum date_mode dmode)
 296{
 297        if (reflog_info && reflog_info->last_commit_reflog) {
 298                struct commit_reflog *commit_reflog = reflog_info->last_commit_reflog;
 299                struct reflog_info *info;
 300                struct strbuf selector = STRBUF_INIT;
 301
 302                info = &commit_reflog->reflogs->items[commit_reflog->recno+1];
 303                get_reflog_selector(&selector, reflog_info, dmode, 0);
 304                if (oneline) {
 305                        printf("%s: %s", selector.buf, info->message);
 306                }
 307                else {
 308                        printf("Reflog: %s (%s)\nReflog message: %s",
 309                               selector.buf, info->email, info->message);
 310                }
 311
 312                strbuf_release(&selector);
 313        }
 314}