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;
  54                void *name_to_free;
  55                name = name_to_free = resolve_refdup(ref, sha1, 1, NULL);
  56                if (name) {
  57                        for_each_reflog_ent(name, read_one_reflog, reflogs);
  58                        free(name_to_free);
  59                }
  60        }
  61        if (reflogs->nr == 0) {
  62                int len = strlen(ref);
  63                char *refname = xmalloc(len + 12);
  64                sprintf(refname, "refs/%s", ref);
  65                for_each_reflog_ent(refname, read_one_reflog, reflogs);
  66                if (reflogs->nr == 0) {
  67                        sprintf(refname, "refs/heads/%s", ref);
  68                        for_each_reflog_ent(refname, read_one_reflog, reflogs);
  69                }
  70                free(refname);
  71        }
  72        return reflogs;
  73}
  74
  75static int get_reflog_recno_by_time(struct complete_reflogs *array,
  76        unsigned long timestamp)
  77{
  78        int i;
  79        for (i = array->nr - 1; i >= 0; i--)
  80                if (timestamp >= array->items[i].timestamp)
  81                        return i;
  82        return -1;
  83}
  84
  85struct commit_info_lifo {
  86        struct commit_info {
  87                struct commit *commit;
  88                void *util;
  89        } *items;
  90        int nr, alloc;
  91};
  92
  93static struct commit_info *get_commit_info(struct commit *commit,
  94                struct commit_info_lifo *lifo, int pop)
  95{
  96        int i;
  97        for (i = 0; i < lifo->nr; i++)
  98                if (lifo->items[i].commit == commit) {
  99                        struct commit_info *result = &lifo->items[i];
 100                        if (pop) {
 101                                if (i + 1 < lifo->nr)
 102                                        memmove(lifo->items + i,
 103                                                lifo->items + i + 1,
 104                                                (lifo->nr - i) *
 105                                                sizeof(struct commit_info));
 106                                lifo->nr--;
 107                        }
 108                        return result;
 109                }
 110        return NULL;
 111}
 112
 113static void add_commit_info(struct commit *commit, void *util,
 114                struct commit_info_lifo *lifo)
 115{
 116        struct commit_info *info;
 117        if (lifo->nr >= lifo->alloc) {
 118                lifo->alloc = alloc_nr(lifo->nr + 1);
 119                lifo->items = xrealloc(lifo->items,
 120                        lifo->alloc * sizeof(struct commit_info));
 121        }
 122        info = lifo->items + lifo->nr;
 123        info->commit = commit;
 124        info->util = util;
 125        lifo->nr++;
 126}
 127
 128struct commit_reflog {
 129        int flag, recno;
 130        struct complete_reflogs *reflogs;
 131};
 132
 133struct reflog_walk_info {
 134        struct commit_info_lifo reflogs;
 135        struct string_list complete_reflogs;
 136        struct commit_reflog *last_commit_reflog;
 137};
 138
 139void init_reflog_walk(struct reflog_walk_info** info)
 140{
 141        *info = xcalloc(sizeof(struct reflog_walk_info), 1);
 142}
 143
 144int add_reflog_for_walk(struct reflog_walk_info *info,
 145                struct commit *commit, const char *name)
 146{
 147        unsigned long timestamp = 0;
 148        int recno = -1;
 149        struct string_list_item *item;
 150        struct complete_reflogs *reflogs;
 151        char *branch, *at = strchr(name, '@');
 152        struct commit_reflog *commit_reflog;
 153
 154        if (commit->object.flags & UNINTERESTING)
 155                die ("Cannot walk reflogs for %s", name);
 156
 157        branch = xstrdup(name);
 158        if (at && at[1] == '{') {
 159                char *ep;
 160                branch[at - name] = '\0';
 161                recno = strtoul(at + 2, &ep, 10);
 162                if (*ep != '}') {
 163                        recno = -1;
 164                        timestamp = approxidate(at + 2);
 165                }
 166        } else
 167                recno = 0;
 168
 169        item = string_list_lookup(&info->complete_reflogs, branch);
 170        if (item)
 171                reflogs = item->util;
 172        else {
 173                if (*branch == '\0') {
 174                        unsigned char sha1[20];
 175                        free(branch);
 176                        branch = resolve_refdup("HEAD", sha1, 0, NULL);
 177                        if (!branch)
 178                                die ("No current branch");
 179
 180                }
 181                reflogs = read_complete_reflog(branch);
 182                if (!reflogs || reflogs->nr == 0) {
 183                        unsigned char sha1[20];
 184                        char *b;
 185                        if (dwim_log(branch, strlen(branch), sha1, &b) == 1) {
 186                                if (reflogs) {
 187                                        free(reflogs->ref);
 188                                        free(reflogs);
 189                                }
 190                                free(branch);
 191                                branch = b;
 192                                reflogs = read_complete_reflog(branch);
 193                        }
 194                }
 195                if (!reflogs || reflogs->nr == 0)
 196                        return -1;
 197                string_list_insert(&info->complete_reflogs, branch)->util
 198                        = reflogs;
 199        }
 200
 201        commit_reflog = xcalloc(sizeof(struct commit_reflog), 1);
 202        if (recno < 0) {
 203                commit_reflog->flag = 1;
 204                commit_reflog->recno = get_reflog_recno_by_time(reflogs, timestamp);
 205                if (commit_reflog->recno < 0) {
 206                        free(branch);
 207                        free(commit_reflog);
 208                        return -1;
 209                }
 210        } else
 211                commit_reflog->recno = reflogs->nr - recno - 1;
 212        commit_reflog->reflogs = reflogs;
 213
 214        add_commit_info(commit, commit_reflog, &info->reflogs);
 215        return 0;
 216}
 217
 218void fake_reflog_parent(struct reflog_walk_info *info, struct commit *commit)
 219{
 220        struct commit_info *commit_info =
 221                get_commit_info(commit, &info->reflogs, 0);
 222        struct commit_reflog *commit_reflog;
 223        struct reflog_info *reflog;
 224
 225        info->last_commit_reflog = NULL;
 226        if (!commit_info)
 227                return;
 228
 229        commit_reflog = commit_info->util;
 230        if (commit_reflog->recno < 0) {
 231                commit->parents = NULL;
 232                return;
 233        }
 234
 235        reflog = &commit_reflog->reflogs->items[commit_reflog->recno];
 236        info->last_commit_reflog = commit_reflog;
 237        commit_reflog->recno--;
 238        commit_info->commit = (struct commit *)parse_object(reflog->osha1);
 239        if (!commit_info->commit) {
 240                commit->parents = NULL;
 241                return;
 242        }
 243
 244        commit->parents = xcalloc(sizeof(struct commit_list), 1);
 245        commit->parents->item = commit_info->commit;
 246}
 247
 248void get_reflog_selector(struct strbuf *sb,
 249                         struct reflog_walk_info *reflog_info,
 250                         enum date_mode dmode,
 251                         int shorten)
 252{
 253        struct commit_reflog *commit_reflog = reflog_info->last_commit_reflog;
 254        struct reflog_info *info;
 255        const char *printed_ref;
 256
 257        if (!commit_reflog)
 258                return;
 259
 260        if (shorten) {
 261                if (!commit_reflog->reflogs->short_ref)
 262                        commit_reflog->reflogs->short_ref
 263                                = shorten_unambiguous_ref(commit_reflog->reflogs->ref, 0);
 264                printed_ref = commit_reflog->reflogs->short_ref;
 265        } else {
 266                printed_ref = commit_reflog->reflogs->ref;
 267        }
 268
 269        strbuf_addf(sb, "%s@{", printed_ref);
 270        if (commit_reflog->flag || dmode) {
 271                info = &commit_reflog->reflogs->items[commit_reflog->recno+1];
 272                strbuf_addstr(sb, show_date(info->timestamp, info->tz, dmode));
 273        } else {
 274                strbuf_addf(sb, "%d", commit_reflog->reflogs->nr
 275                            - 2 - commit_reflog->recno);
 276        }
 277
 278        strbuf_addch(sb, '}');
 279}
 280
 281void get_reflog_message(struct strbuf *sb,
 282                        struct reflog_walk_info *reflog_info)
 283{
 284        struct commit_reflog *commit_reflog = reflog_info->last_commit_reflog;
 285        struct reflog_info *info;
 286        size_t len;
 287
 288        if (!commit_reflog)
 289                return;
 290
 291        info = &commit_reflog->reflogs->items[commit_reflog->recno+1];
 292        len = strlen(info->message);
 293        if (len > 0)
 294                len--; /* strip away trailing newline */
 295        strbuf_add(sb, info->message, len);
 296}
 297
 298const char *get_reflog_ident(struct reflog_walk_info *reflog_info)
 299{
 300        struct commit_reflog *commit_reflog = reflog_info->last_commit_reflog;
 301        struct reflog_info *info;
 302
 303        if (!commit_reflog)
 304                return NULL;
 305
 306        info = &commit_reflog->reflogs->items[commit_reflog->recno+1];
 307        return info->email;
 308}
 309
 310void show_reflog_message(struct reflog_walk_info *reflog_info, int oneline,
 311        enum date_mode dmode)
 312{
 313        if (reflog_info && reflog_info->last_commit_reflog) {
 314                struct commit_reflog *commit_reflog = reflog_info->last_commit_reflog;
 315                struct reflog_info *info;
 316                struct strbuf selector = STRBUF_INIT;
 317
 318                info = &commit_reflog->reflogs->items[commit_reflog->recno+1];
 319                get_reflog_selector(&selector, reflog_info, dmode, 0);
 320                if (oneline) {
 321                        printf("%s: %s", selector.buf, info->message);
 322                }
 323                else {
 324                        printf("Reflog: %s (%s)\nReflog message: %s",
 325                               selector.buf, info->email, info->message);
 326                }
 327
 328                strbuf_release(&selector);
 329        }
 330}