Andrew's git - gitweb.git/blob - builtin-rev-list.c

   1#include "cache.h"
   2#include "refs.h"
   3#include "tag.h"
   4#include "commit.h"
   5#include "tree.h"
   6#include "blob.h"
   7#include "tree-walk.h"
   8#include "diff.h"
   9#include "revision.h"
  10#include "builtin.h"
  11
  12/* bits #0-15 in revision.h */
  13
  14#define COUNTED         (1u<<16)
  15
  16static const char rev_list_usage[] =
  17"git-rev-list [OPTION] <commit-id>... [ -- paths... ]\n"
  18"  limiting output:\n"
  19"    --max-count=nr\n"
  20"    --max-age=epoch\n"
  21"    --min-age=epoch\n"
  22"    --sparse\n"
  23"    --no-merges\n"
  24"    --remove-empty\n"
  25"    --all\n"
  26"  ordering output:\n"
  27"    --topo-order\n"
  28"    --date-order\n"
  29"  formatting output:\n"
  30"    --parents\n"
  31"    --objects | --objects-edge\n"
  32"    --unpacked\n"
  33"    --header | --pretty\n"
  34"    --abbrev=nr | --no-abbrev\n"
  35"    --abbrev-commit\n"
  36"  special purpose:\n"
  37"    --bisect"
  38;
  39
  40static struct rev_info revs;
  41
  42static int bisect_list = 0;
  43static int show_timestamp = 0;
  44static int hdr_termination = 0;
  45static const char *header_prefix;
  46
  47static void show_commit(struct commit *commit)
  48{
  49        if (show_timestamp)
  50                printf("%lu ", commit->date);
  51        if (header_prefix)
  52                fputs(header_prefix, stdout);
  53        if (commit->object.flags & BOUNDARY)
  54                putchar('-');
  55        if (revs.abbrev_commit && revs.abbrev)
  56                fputs(find_unique_abbrev(commit->object.sha1, revs.abbrev),
  57                      stdout);
  58        else
  59                fputs(sha1_to_hex(commit->object.sha1), stdout);
  60        if (revs.parents) {
  61                struct commit_list *parents = commit->parents;
  62                while (parents) {
  63                        struct object *o = &(parents->item->object);
  64                        parents = parents->next;
  65                        if (o->flags & TMP_MARK)
  66                                continue;
  67                        printf(" %s", sha1_to_hex(o->sha1));
  68                        o->flags |= TMP_MARK;
  69                }
  70                /* TMP_MARK is a general purpose flag that can
  71                 * be used locally, but the user should clean
  72                 * things up after it is done with them.
  73                 */
  74                for (parents = commit->parents;
  75                     parents;
  76                     parents = parents->next)
  77                        parents->item->object.flags &= ~TMP_MARK;
  78        }
  79        if (revs.commit_format == CMIT_FMT_ONELINE)
  80                putchar(' ');
  81        else
  82                putchar('\n');
  83
  84        if (revs.verbose_header) {
  85                static char pretty_header[16384];
  86                pretty_print_commit(revs.commit_format, commit, ~0,
  87                                    pretty_header, sizeof(pretty_header),
  88                                    revs.abbrev, NULL, NULL);
  89                printf("%s%c", pretty_header, hdr_termination);
  90        }
  91        fflush(stdout);
  92        if (commit->parents) {
  93                free_commit_list(commit->parents);
  94                commit->parents = NULL;
  95        }
  96        if (commit->buffer) {
  97                free(commit->buffer);
  98                commit->buffer = NULL;
  99        }
 100}
 101
 102static struct object_list **process_blob(struct blob *blob,
 103                                         struct object_list **p,
 104                                         struct name_path *path,
 105                                         const char *name)
 106{
 107        struct object *obj = &blob->object;
 108
 109        if (!revs.blob_objects)
 110                return p;
 111        if (obj->flags & (UNINTERESTING | SEEN))
 112                return p;
 113        obj->flags |= SEEN;
 114        name = strdup(name);
 115        return add_object(obj, p, path, name);
 116}
 117
 118static struct object_list **process_tree(struct tree *tree,
 119                                         struct object_list **p,
 120                                         struct name_path *path,
 121                                         const char *name)
 122{
 123        struct object *obj = &tree->object;
 124        struct tree_desc desc;
 125        struct name_entry entry;
 126        struct name_path me;
 127
 128        if (!revs.tree_objects)
 129                return p;
 130        if (obj->flags & (UNINTERESTING | SEEN))
 131                return p;
 132        if (parse_tree(tree) < 0)
 133                die("bad tree object %s", sha1_to_hex(obj->sha1));
 134        obj->flags |= SEEN;
 135        name = strdup(name);
 136        p = add_object(obj, p, path, name);
 137        me.up = path;
 138        me.elem = name;
 139        me.elem_len = strlen(name);
 140
 141        desc.buf = tree->buffer;
 142        desc.size = tree->size;
 143
 144        while (tree_entry(&desc, &entry)) {
 145                if (S_ISDIR(entry.mode))
 146                        p = process_tree(lookup_tree(entry.sha1), p, &me, entry.path);
 147                else
 148                        p = process_blob(lookup_blob(entry.sha1), p, &me, entry.path);
 149        }
 150        free(tree->buffer);
 151        tree->buffer = NULL;
 152        return p;
 153}
 154
 155static void show_commit_list(struct rev_info *revs)
 156{
 157        struct commit *commit;
 158        struct object_list *objects = NULL, **p = &objects, *pending;
 159
 160        while ((commit = get_revision(revs)) != NULL) {
 161                p = process_tree(commit->tree, p, NULL, "");
 162                show_commit(commit);
 163        }
 164        for (pending = revs->pending_objects; pending; pending = pending->next) {
 165                struct object *obj = pending->item;
 166                const char *name = pending->name;
 167                if (obj->flags & (UNINTERESTING | SEEN))
 168                        continue;
 169                if (obj->type == TYPE_TAG) {
 170                        obj->flags |= SEEN;
 171                        p = add_object(obj, p, NULL, name);
 172                        continue;
 173                }
 174                if (obj->type == TYPE_TREE) {
 175                        p = process_tree((struct tree *)obj, p, NULL, name);
 176                        continue;
 177                }
 178                if (obj->type == TYPE_BLOB) {
 179                        p = process_blob((struct blob *)obj, p, NULL, name);
 180                        continue;
 181                }
 182                die("unknown pending object %s (%s)", sha1_to_hex(obj->sha1), name);
 183        }
 184        while (objects) {
 185                /* An object with name "foo\n0000000..." can be used to
 186                 * confuse downstream git-pack-objects very badly.
 187                 */
 188                const char *ep = strchr(objects->name, '\n');
 189                if (ep) {
 190                        printf("%s %.*s\n", sha1_to_hex(objects->item->sha1),
 191                               (int) (ep - objects->name),
 192                               objects->name);
 193                }
 194                else
 195                        printf("%s %s\n", sha1_to_hex(objects->item->sha1), objects->name);
 196                objects = objects->next;
 197        }
 198}
 199
 200/*
 201 * This is a truly stupid algorithm, but it's only
 202 * used for bisection, and we just don't care enough.
 203 *
 204 * We care just barely enough to avoid recursing for
 205 * non-merge entries.
 206 */
 207static int count_distance(struct commit_list *entry)
 208{
 209        int nr = 0;
 210
 211        while (entry) {
 212                struct commit *commit = entry->item;
 213                struct commit_list *p;
 214
 215                if (commit->object.flags & (UNINTERESTING | COUNTED))
 216                        break;
 217                if (!revs.prune_fn || (commit->object.flags & TREECHANGE))
 218                        nr++;
 219                commit->object.flags |= COUNTED;
 220                p = commit->parents;
 221                entry = p;
 222                if (p) {
 223                        p = p->next;
 224                        while (p) {
 225                                nr += count_distance(p);
 226                                p = p->next;
 227                        }
 228                }
 229        }
 230
 231        return nr;
 232}
 233
 234static void clear_distance(struct commit_list *list)
 235{
 236        while (list) {
 237                struct commit *commit = list->item;
 238                commit->object.flags &= ~COUNTED;
 239                list = list->next;
 240        }
 241}
 242
 243static struct commit_list *find_bisection(struct commit_list *list)
 244{
 245        int nr, closest;
 246        struct commit_list *p, *best;
 247
 248        nr = 0;
 249        p = list;
 250        while (p) {
 251                if (!revs.prune_fn || (p->item->object.flags & TREECHANGE))
 252                        nr++;
 253                p = p->next;
 254        }
 255        closest = 0;
 256        best = list;
 257
 258        for (p = list; p; p = p->next) {
 259                int distance;
 260
 261                if (revs.prune_fn && !(p->item->object.flags & TREECHANGE))
 262                        continue;
 263
 264                distance = count_distance(p);
 265                clear_distance(list);
 266                if (nr - distance < distance)
 267                        distance = nr - distance;
 268                if (distance > closest) {
 269                        best = p;
 270                        closest = distance;
 271                }
 272        }
 273        if (best)
 274                best->next = NULL;
 275        return best;
 276}
 277
 278static void mark_edge_parents_uninteresting(struct commit *commit)
 279{
 280        struct commit_list *parents;
 281
 282        for (parents = commit->parents; parents; parents = parents->next) {
 283                struct commit *parent = parents->item;
 284                if (!(parent->object.flags & UNINTERESTING))
 285                        continue;
 286                mark_tree_uninteresting(parent->tree);
 287                if (revs.edge_hint && !(parent->object.flags & SHOWN)) {
 288                        parent->object.flags |= SHOWN;
 289                        printf("-%s\n", sha1_to_hex(parent->object.sha1));
 290                }
 291        }
 292}
 293
 294static void mark_edges_uninteresting(struct commit_list *list)
 295{
 296        for ( ; list; list = list->next) {
 297                struct commit *commit = list->item;
 298
 299                if (commit->object.flags & UNINTERESTING) {
 300                        mark_tree_uninteresting(commit->tree);
 301                        continue;
 302                }
 303                mark_edge_parents_uninteresting(commit);
 304        }
 305}
 306
 307int cmd_rev_list(int argc, const char **argv, char **envp)
 308{
 309        struct commit_list *list;
 310        int i;
 311
 312        init_revisions(&revs);
 313        revs.abbrev = 0;
 314        revs.commit_format = CMIT_FMT_UNSPECIFIED;
 315        argc = setup_revisions(argc, argv, &revs, NULL);
 316
 317        for (i = 1 ; i < argc; i++) {
 318                const char *arg = argv[i];
 319
 320                if (!strcmp(arg, "--header")) {
 321                        revs.verbose_header = 1;
 322                        continue;
 323                }
 324                if (!strcmp(arg, "--timestamp")) {
 325                        show_timestamp = 1;
 326                        continue;
 327                }
 328                if (!strcmp(arg, "--bisect")) {
 329                        bisect_list = 1;
 330                        continue;
 331                }
 332                usage(rev_list_usage);
 333
 334        }
 335        if (revs.commit_format != CMIT_FMT_UNSPECIFIED) {
 336                /* The command line has a --pretty  */
 337                hdr_termination = '\n';
 338                if (revs.commit_format == CMIT_FMT_ONELINE)
 339                        header_prefix = "";
 340                else
 341                        header_prefix = "commit ";
 342        }
 343        else if (revs.verbose_header)
 344                /* Only --header was specified */
 345                revs.commit_format = CMIT_FMT_RAW;
 346
 347        list = revs.commits;
 348
 349        if ((!list &&
 350             (!(revs.tag_objects||revs.tree_objects||revs.blob_objects) &&
 351              !revs.pending_objects)) ||
 352            revs.diff)
 353                usage(rev_list_usage);
 354
 355        save_commit_buffer = revs.verbose_header;
 356        track_object_refs = 0;
 357        if (bisect_list)
 358                revs.limited = 1;
 359
 360        prepare_revision_walk(&revs);
 361        if (revs.tree_objects)
 362                mark_edges_uninteresting(revs.commits);
 363
 364        if (bisect_list)
 365                revs.commits = find_bisection(revs.commits);
 366
 367        show_commit_list(&revs);
 368
 369        return 0;
 370}