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