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