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                struct object_id ooid, noid;
  14                char *email;
  15                timestamp_t timestamp;
  16                int tz;
  17                char *message;
  18        } *items;
  19        int nr, alloc;
  20};
  21
  22static int read_one_reflog(struct object_id *ooid, struct object_id *noid,
  23                const char *email, timestamp_t 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        ALLOC_GROW(array->items, array->nr + 1, array->alloc);
  30        item = array->items + array->nr;
  31        oidcpy(&item->ooid, ooid);
  32        oidcpy(&item->noid, noid);
  33        item->email = xstrdup(email);
  34        item->timestamp = timestamp;
  35        item->tz = tz;
  36        item->message = xstrdup(message);
  37        array->nr++;
  38        return 0;
  39}
  40
  41static void free_complete_reflog(struct complete_reflogs *array)
  42{
  43        int i;
  44
  45        if (!array)
  46                return;
  47
  48        for (i = 0; i < array->nr; i++) {
  49                free(array->items[i].email);
  50                free(array->items[i].message);
  51        }
  52        free(array->items);
  53        free(array->ref);
  54        free(array);
  55}
  56
  57static struct complete_reflogs *read_complete_reflog(const char *ref)
  58{
  59        struct complete_reflogs *reflogs =
  60                xcalloc(1, sizeof(struct complete_reflogs));
  61        reflogs->ref = xstrdup(ref);
  62        for_each_reflog_ent(ref, read_one_reflog, reflogs);
  63        if (reflogs->nr == 0) {
  64                struct object_id oid;
  65                const char *name;
  66                void *name_to_free;
  67                name = name_to_free = resolve_refdup(ref, RESOLVE_REF_READING,
  68                                                     oid.hash, NULL);
  69                if (name) {
  70                        for_each_reflog_ent(name, read_one_reflog, reflogs);
  71                        free(name_to_free);
  72                }
  73        }
  74        if (reflogs->nr == 0) {
  75                char *refname = xstrfmt("refs/%s", ref);
  76                for_each_reflog_ent(refname, read_one_reflog, reflogs);
  77                if (reflogs->nr == 0) {
  78                        free(refname);
  79                        refname = xstrfmt("refs/heads/%s", ref);
  80                        for_each_reflog_ent(refname, read_one_reflog, reflogs);
  81                }
  82                free(refname);
  83        }
  84        return reflogs;
  85}
  86
  87static int get_reflog_recno_by_time(struct complete_reflogs *array,
  88        timestamp_t timestamp)
  89{
  90        int i;
  91        for (i = array->nr - 1; i >= 0; i--)
  92                if (timestamp >= array->items[i].timestamp)
  93                        return i;
  94        return -1;
  95}
  96
  97struct commit_info_lifo {
  98        struct commit_info {
  99                struct commit *commit;
 100                void *util;
 101        } *items;
 102        int nr, alloc;
 103};
 104
 105static struct commit_info *get_commit_info(struct commit *commit,
 106                struct commit_info_lifo *lifo, int pop)
 107{
 108        int i;
 109        for (i = 0; i < lifo->nr; i++)
 110                if (lifo->items[i].commit == commit) {
 111                        struct commit_info *result = &lifo->items[i];
 112                        if (pop) {
 113                                if (i + 1 < lifo->nr)
 114                                        memmove(lifo->items + i,
 115                                                lifo->items + i + 1,
 116                                                (lifo->nr - i) *
 117                                                sizeof(struct commit_info));
 118                                lifo->nr--;
 119                        }
 120                        return result;
 121                }
 122        return NULL;
 123}
 124
 125static void add_commit_info(struct commit *commit, void *util,
 126                struct commit_info_lifo *lifo)
 127{
 128        struct commit_info *info;
 129        ALLOC_GROW(lifo->items, lifo->nr + 1, lifo->alloc);
 130        info = lifo->items + lifo->nr;
 131        info->commit = commit;
 132        info->util = util;
 133        lifo->nr++;
 134}
 135
 136struct commit_reflog {
 137        int recno;
 138        enum selector_type {
 139                SELECTOR_NONE,
 140                SELECTOR_INDEX,
 141                SELECTOR_DATE
 142        } selector;
 143        struct complete_reflogs *reflogs;
 144};
 145
 146struct reflog_walk_info {
 147        struct commit_info_lifo reflogs;
 148        struct string_list complete_reflogs;
 149        struct commit_reflog *last_commit_reflog;
 150};
 151
 152void init_reflog_walk(struct reflog_walk_info **info)
 153{
 154        *info = xcalloc(1, sizeof(struct reflog_walk_info));
 155        (*info)->complete_reflogs.strdup_strings = 1;
 156}
 157
 158int add_reflog_for_walk(struct reflog_walk_info *info,
 159                struct commit *commit, const char *name)
 160{
 161        timestamp_t timestamp = 0;
 162        int recno = -1;
 163        struct string_list_item *item;
 164        struct complete_reflogs *reflogs;
 165        char *branch, *at = strchr(name, '@');
 166        struct commit_reflog *commit_reflog;
 167        enum selector_type selector = SELECTOR_NONE;
 168
 169        if (commit->object.flags & UNINTERESTING)
 170                die ("Cannot walk reflogs for %s", name);
 171
 172        branch = xstrdup(name);
 173        if (at && at[1] == '{') {
 174                char *ep;
 175                branch[at - name] = '\0';
 176                recno = strtoul(at + 2, &ep, 10);
 177                if (*ep != '}') {
 178                        recno = -1;
 179                        timestamp = approxidate(at + 2);
 180                        selector = SELECTOR_DATE;
 181                }
 182                else
 183                        selector = SELECTOR_INDEX;
 184        } else
 185                recno = 0;
 186
 187        item = string_list_lookup(&info->complete_reflogs, branch);
 188        if (item)
 189                reflogs = item->util;
 190        else {
 191                if (*branch == '\0') {
 192                        struct object_id oid;
 193                        free(branch);
 194                        branch = resolve_refdup("HEAD", 0, oid.hash, NULL);
 195                        if (!branch)
 196                                die ("No current branch");
 197
 198                }
 199                reflogs = read_complete_reflog(branch);
 200                if (!reflogs || reflogs->nr == 0) {
 201                        struct object_id oid;
 202                        char *b;
 203                        int ret = dwim_log(branch, strlen(branch),
 204                                           oid.hash, &b);
 205                        if (ret > 1)
 206                                free(b);
 207                        else if (ret == 1) {
 208                                free_complete_reflog(reflogs);
 209                                free(branch);
 210                                branch = b;
 211                                reflogs = read_complete_reflog(branch);
 212                        }
 213                }
 214                if (!reflogs || reflogs->nr == 0) {
 215                        free_complete_reflog(reflogs);
 216                        free(branch);
 217                        return -1;
 218                }
 219                string_list_insert(&info->complete_reflogs, branch)->util
 220                        = reflogs;
 221        }
 222        free(branch);
 223
 224        commit_reflog = xcalloc(1, sizeof(struct commit_reflog));
 225        if (recno < 0) {
 226                commit_reflog->recno = get_reflog_recno_by_time(reflogs, timestamp);
 227                if (commit_reflog->recno < 0) {
 228                        free(commit_reflog);
 229                        return -1;
 230                }
 231        } else
 232                commit_reflog->recno = reflogs->nr - recno - 1;
 233        commit_reflog->selector = selector;
 234        commit_reflog->reflogs = reflogs;
 235
 236        add_commit_info(commit, commit_reflog, &info->reflogs);
 237        return 0;
 238}
 239
 240void fake_reflog_parent(struct reflog_walk_info *info, struct commit *commit)
 241{
 242        struct commit_info *commit_info =
 243                get_commit_info(commit, &info->reflogs, 0);
 244        struct commit_reflog *commit_reflog;
 245        struct object *logobj;
 246        struct reflog_info *reflog;
 247
 248        info->last_commit_reflog = NULL;
 249        if (!commit_info)
 250                return;
 251
 252        commit_reflog = commit_info->util;
 253        if (commit_reflog->recno < 0) {
 254                commit->parents = NULL;
 255                return;
 256        }
 257        info->last_commit_reflog = commit_reflog;
 258
 259        do {
 260                reflog = &commit_reflog->reflogs->items[commit_reflog->recno];
 261                commit_reflog->recno--;
 262                logobj = parse_object(&reflog->ooid);
 263        } while (commit_reflog->recno && (logobj && logobj->type != OBJ_COMMIT));
 264
 265        if (!logobj && commit_reflog->recno >= 0 && is_null_oid(&reflog->ooid)) {
 266                /* a root commit, but there are still more entries to show */
 267                reflog = &commit_reflog->reflogs->items[commit_reflog->recno];
 268                logobj = parse_object(&reflog->noid);
 269                if (!logobj)
 270                        logobj = parse_object(&reflog->ooid);
 271        }
 272
 273        if (!logobj || logobj->type != OBJ_COMMIT) {
 274                commit_info->commit = NULL;
 275                commit->parents = NULL;
 276                return;
 277        }
 278        commit_info->commit = (struct commit *)logobj;
 279
 280        commit->parents = xcalloc(1, sizeof(struct commit_list));
 281        commit->parents->item = commit_info->commit;
 282}
 283
 284void get_reflog_selector(struct strbuf *sb,
 285                         struct reflog_walk_info *reflog_info,
 286                         const struct date_mode *dmode, int force_date,
 287                         int shorten)
 288{
 289        struct commit_reflog *commit_reflog = reflog_info->last_commit_reflog;
 290        struct reflog_info *info;
 291        const char *printed_ref;
 292
 293        if (!commit_reflog)
 294                return;
 295
 296        if (shorten) {
 297                if (!commit_reflog->reflogs->short_ref)
 298                        commit_reflog->reflogs->short_ref
 299                                = shorten_unambiguous_ref(commit_reflog->reflogs->ref, 0);
 300                printed_ref = commit_reflog->reflogs->short_ref;
 301        } else {
 302                printed_ref = commit_reflog->reflogs->ref;
 303        }
 304
 305        strbuf_addf(sb, "%s@{", printed_ref);
 306        if (commit_reflog->selector == SELECTOR_DATE ||
 307            (commit_reflog->selector == SELECTOR_NONE && force_date)) {
 308                info = &commit_reflog->reflogs->items[commit_reflog->recno+1];
 309                strbuf_addstr(sb, show_date(info->timestamp, info->tz, dmode));
 310        } else {
 311                strbuf_addf(sb, "%d", commit_reflog->reflogs->nr
 312                            - 2 - commit_reflog->recno);
 313        }
 314
 315        strbuf_addch(sb, '}');
 316}
 317
 318void get_reflog_message(struct strbuf *sb,
 319                        struct reflog_walk_info *reflog_info)
 320{
 321        struct commit_reflog *commit_reflog = reflog_info->last_commit_reflog;
 322        struct reflog_info *info;
 323        size_t len;
 324
 325        if (!commit_reflog)
 326                return;
 327
 328        info = &commit_reflog->reflogs->items[commit_reflog->recno+1];
 329        len = strlen(info->message);
 330        if (len > 0)
 331                len--; /* strip away trailing newline */
 332        strbuf_add(sb, info->message, len);
 333}
 334
 335const char *get_reflog_ident(struct reflog_walk_info *reflog_info)
 336{
 337        struct commit_reflog *commit_reflog = reflog_info->last_commit_reflog;
 338        struct reflog_info *info;
 339
 340        if (!commit_reflog)
 341                return NULL;
 342
 343        info = &commit_reflog->reflogs->items[commit_reflog->recno+1];
 344        return info->email;
 345}
 346
 347void show_reflog_message(struct reflog_walk_info *reflog_info, int oneline,
 348                         const struct date_mode *dmode, int force_date)
 349{
 350        if (reflog_info && reflog_info->last_commit_reflog) {
 351                struct commit_reflog *commit_reflog = reflog_info->last_commit_reflog;
 352                struct reflog_info *info;
 353                struct strbuf selector = STRBUF_INIT;
 354
 355                info = &commit_reflog->reflogs->items[commit_reflog->recno+1];
 356                get_reflog_selector(&selector, reflog_info, dmode, force_date, 0);
 357                if (oneline) {
 358                        printf("%s: %s", selector.buf, info->message);
 359                }
 360                else {
 361                        printf("Reflog: %s (%s)\nReflog message: %s",
 362                               selector.buf, info->email, info->message);
 363                }
 364
 365                strbuf_release(&selector);
 366        }
 367}