Andrew's git / gitweb.git / reflog-walk.c
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reflog-walk.con commit am: use gmtime() to parse mercurial patch date (e9dfe25)
   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        ALLOC_GROW(array->items, array->nr + 1, array->alloc);
  30        item = array->items + array->nr;
  31        hashcpy(item->osha1, osha1);
  32        hashcpy(item->nsha1, nsha1);
  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                unsigned char sha1[20];
  49                const char *name;
  50                void *name_to_free;
  51                name = name_to_free = resolve_refdup(ref, RESOLVE_REF_READING,
  52                                                     sha1, 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                int len = strlen(ref);
  60                char *refname = xmalloc(len + 12);
  61                sprintf(refname, "refs/%s", ref);
  62                for_each_reflog_ent(refname, read_one_reflog, reflogs);
  63                if (reflogs->nr == 0) {
  64                        sprintf(refname, "refs/heads/%s", ref);
  65                        for_each_reflog_ent(refname, read_one_reflog, reflogs);
  66                }
  67                free(refname);
  68        }
  69        return reflogs;
  70}
  71
  72static int get_reflog_recno_by_time(struct complete_reflogs *array,
  73        unsigned long timestamp)
  74{
  75        int i;
  76        for (i = array->nr - 1; i >= 0; i--)
  77                if (timestamp >= array->items[i].timestamp)
  78                        return i;
  79        return -1;
  80}
  81
  82struct commit_info_lifo {
  83        struct commit_info {
  84                struct commit *commit;
  85                void *util;
  86        } *items;
  87        int nr, alloc;
  88};
  89
  90static struct commit_info *get_commit_info(struct commit *commit,
  91                struct commit_info_lifo *lifo, int pop)
  92{
  93        int i;
  94        for (i = 0; i < lifo->nr; i++)
  95                if (lifo->items[i].commit == commit) {
  96                        struct commit_info *result = &lifo->items[i];
  97                        if (pop) {
  98                                if (i + 1 < lifo->nr)
  99                                        memmove(lifo->items + i,
 100                                                lifo->items + i + 1,
 101                                                (lifo->nr - i) *
 102                                                sizeof(struct commit_info));
 103                                lifo->nr--;
 104                        }
 105                        return result;
 106                }
 107        return NULL;
 108}
 109
 110static void add_commit_info(struct commit *commit, void *util,
 111                struct commit_info_lifo *lifo)
 112{
 113        struct commit_info *info;
 114        ALLOC_GROW(lifo->items, lifo->nr + 1, lifo->alloc);
 115        info = lifo->items + lifo->nr;
 116        info->commit = commit;
 117        info->util = util;
 118        lifo->nr++;
 119}
 120
 121struct commit_reflog {
 122        int recno;
 123        enum selector_type {
 124                SELECTOR_NONE,
 125                SELECTOR_INDEX,
 126                SELECTOR_DATE
 127        } selector;
 128        struct complete_reflogs *reflogs;
 129};
 130
 131struct reflog_walk_info {
 132        struct commit_info_lifo reflogs;
 133        struct string_list complete_reflogs;
 134        struct commit_reflog *last_commit_reflog;
 135};
 136
 137void init_reflog_walk(struct reflog_walk_info **info)
 138{
 139        *info = xcalloc(1, sizeof(struct reflog_walk_info));
 140}
 141
 142int add_reflog_for_walk(struct reflog_walk_info *info,
 143                struct commit *commit, const char *name)
 144{
 145        unsigned long timestamp = 0;
 146        int recno = -1;
 147        struct string_list_item *item;
 148        struct complete_reflogs *reflogs;
 149        char *branch, *at = strchr(name, '@');
 150        struct commit_reflog *commit_reflog;
 151        enum selector_type selector = SELECTOR_NONE;
 152
 153        if (commit->object.flags & UNINTERESTING)
 154                die ("Cannot walk reflogs for %s", name);
 155
 156        branch = xstrdup(name);
 157        if (at && at[1] == '{') {
 158                char *ep;
 159                branch[at - name] = '\0';
 160                recno = strtoul(at + 2, &ep, 10);
 161                if (*ep != '}') {
 162                        recno = -1;
 163                        timestamp = approxidate(at + 2);
 164                        selector = SELECTOR_DATE;
 165                }
 166                else
 167                        selector = SELECTOR_INDEX;
 168        } else
 169                recno = 0;
 170
 171        item = string_list_lookup(&info->complete_reflogs, branch);
 172        if (item)
 173                reflogs = item->util;
 174        else {
 175                if (*branch == '\0') {
 176                        unsigned char sha1[20];
 177                        free(branch);
 178                        branch = resolve_refdup("HEAD", 0, sha1, NULL);
 179                        if (!branch)
 180                                die ("No current branch");
 181
 182                }
 183                reflogs = read_complete_reflog(branch);
 184                if (!reflogs || reflogs->nr == 0) {
 185                        unsigned char sha1[20];
 186                        char *b;
 187                        if (dwim_log(branch, strlen(branch), sha1, &b) == 1) {
 188                                if (reflogs) {
 189                                        free(reflogs->ref);
 190                                        free(reflogs);
 191                                }
 192                                free(branch);
 193                                branch = b;
 194                                reflogs = read_complete_reflog(branch);
 195                        }
 196                }
 197                if (!reflogs || reflogs->nr == 0)
 198                        return -1;
 199                string_list_insert(&info->complete_reflogs, branch)->util
 200                        = reflogs;
 201        }
 202
 203        commit_reflog = xcalloc(1, sizeof(struct commit_reflog));
 204        if (recno < 0) {
 205                commit_reflog->recno = get_reflog_recno_by_time(reflogs, timestamp);
 206                if (commit_reflog->recno < 0) {
 207                        free(branch);
 208                        free(commit_reflog);
 209                        return -1;
 210                }
 211        } else
 212                commit_reflog->recno = reflogs->nr - recno - 1;
 213        commit_reflog->selector = selector;
 214        commit_reflog->reflogs = reflogs;
 215
 216        add_commit_info(commit, commit_reflog, &info->reflogs);
 217        return 0;
 218}
 219
 220void fake_reflog_parent(struct reflog_walk_info *info, struct commit *commit)
 221{
 222        struct commit_info *commit_info =
 223                get_commit_info(commit, &info->reflogs, 0);
 224        struct commit_reflog *commit_reflog;
 225        struct reflog_info *reflog;
 226
 227        info->last_commit_reflog = NULL;
 228        if (!commit_info)
 229                return;
 230
 231        commit_reflog = commit_info->util;
 232        if (commit_reflog->recno < 0) {
 233                commit->parents = NULL;
 234                return;
 235        }
 236
 237        reflog = &commit_reflog->reflogs->items[commit_reflog->recno];
 238        info->last_commit_reflog = commit_reflog;
 239        commit_reflog->recno--;
 240        commit_info->commit = (struct commit *)parse_object(reflog->osha1);
 241        if (!commit_info->commit) {
 242                commit->parents = NULL;
 243                return;
 244        }
 245
 246        commit->parents = xcalloc(1, sizeof(struct commit_list));
 247        commit->parents->item = commit_info->commit;
 248}
 249
 250void get_reflog_selector(struct strbuf *sb,
 251                         struct reflog_walk_info *reflog_info,
 252                         enum date_mode dmode, int force_date,
 253                         int shorten)
 254{
 255        struct commit_reflog *commit_reflog = reflog_info->last_commit_reflog;
 256        struct reflog_info *info;
 257        const char *printed_ref;
 258
 259        if (!commit_reflog)
 260                return;
 261
 262        if (shorten) {
 263                if (!commit_reflog->reflogs->short_ref)
 264                        commit_reflog->reflogs->short_ref
 265                                = shorten_unambiguous_ref(commit_reflog->reflogs->ref, 0);
 266                printed_ref = commit_reflog->reflogs->short_ref;
 267        } else {
 268                printed_ref = commit_reflog->reflogs->ref;
 269        }
 270
 271        strbuf_addf(sb, "%s@{", printed_ref);
 272        if (commit_reflog->selector == SELECTOR_DATE ||
 273            (commit_reflog->selector == SELECTOR_NONE && force_date)) {
 274                info = &commit_reflog->reflogs->items[commit_reflog->recno+1];
 275                strbuf_addstr(sb, show_date(info->timestamp, info->tz, dmode));
 276        } else {
 277                strbuf_addf(sb, "%d", commit_reflog->reflogs->nr
 278                            - 2 - commit_reflog->recno);
 279        }
 280
 281        strbuf_addch(sb, '}');
 282}
 283
 284void get_reflog_message(struct strbuf *sb,
 285                        struct reflog_walk_info *reflog_info)
 286{
 287        struct commit_reflog *commit_reflog = reflog_info->last_commit_reflog;
 288        struct reflog_info *info;
 289        size_t len;
 290
 291        if (!commit_reflog)
 292                return;
 293
 294        info = &commit_reflog->reflogs->items[commit_reflog->recno+1];
 295        len = strlen(info->message);
 296        if (len > 0)
 297                len--; /* strip away trailing newline */
 298        strbuf_add(sb, info->message, len);
 299}
 300
 301const char *get_reflog_ident(struct reflog_walk_info *reflog_info)
 302{
 303        struct commit_reflog *commit_reflog = reflog_info->last_commit_reflog;
 304        struct reflog_info *info;
 305
 306        if (!commit_reflog)
 307                return NULL;
 308
 309        info = &commit_reflog->reflogs->items[commit_reflog->recno+1];
 310        return info->email;
 311}
 312
 313void show_reflog_message(struct reflog_walk_info *reflog_info, int oneline,
 314                         enum date_mode dmode, int force_date)
 315{
 316        if (reflog_info && reflog_info->last_commit_reflog) {
 317                struct commit_reflog *commit_reflog = reflog_info->last_commit_reflog;
 318                struct reflog_info *info;
 319                struct strbuf selector = STRBUF_INIT;
 320
 321                info = &commit_reflog->reflogs->items[commit_reflog->recno+1];
 322                get_reflog_selector(&selector, reflog_info, dmode, force_date, 0);
 323                if (oneline) {
 324                        printf("%s: %s", selector.buf, info->message);
 325                }
 326                else {
 327                        printf("Reflog: %s (%s)\nReflog message: %s",
 328                               selector.buf, info->email, info->message);
 329                }
 330
 331                strbuf_release(&selector);
 332        }
 333}