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}
  93
  94static struct object_list **process_blob(struct blob *blob,
  95                                         struct object_list **p,
  96                                         struct name_path *path,
  97                                         const char *name)
  98{
  99        struct object *obj = &blob->object;
 100
 101        if (!revs.blob_objects)
 102                return p;
 103        if (obj->flags & (UNINTERESTING | SEEN))
 104                return p;
 105        obj->flags |= SEEN;
 106        name = strdup(name);
 107        return add_object(obj, p, path, name);
 108}
 109
 110static struct object_list **process_tree(struct tree *tree,
 111                                         struct object_list **p,
 112                                         struct name_path *path,
 113                                         const char *name)
 114{
 115        struct object *obj = &tree->object;
 116        struct tree_desc desc;
 117        struct name_entry entry;
 118        struct name_path me;
 119
 120        if (!revs.tree_objects)
 121                return p;
 122        if (obj->flags & (UNINTERESTING | SEEN))
 123                return p;
 124        if (parse_tree(tree) < 0)
 125                die("bad tree object %s", sha1_to_hex(obj->sha1));
 126        obj->flags |= SEEN;
 127        name = strdup(name);
 128        p = add_object(obj, p, path, name);
 129        me.up = path;
 130        me.elem = name;
 131        me.elem_len = strlen(name);
 132
 133        desc.buf = tree->buffer;
 134        desc.size = tree->size;
 135
 136        while (tree_entry(&desc, &entry)) {
 137                if (S_ISDIR(entry.mode))
 138                        p = process_tree(lookup_tree(entry.sha1), p, &me, name);
 139                else
 140                        p = process_blob(lookup_blob(entry.sha1), p, &me, name);
 141        }
 142        free(tree->buffer);
 143        tree->buffer = NULL;
 144        return p;
 145}
 146
 147static void show_commit_list(struct rev_info *revs)
 148{
 149        struct commit *commit;
 150        struct object_list *objects = NULL, **p = &objects, *pending;
 151
 152        while ((commit = get_revision(revs)) != NULL) {
 153                p = process_tree(commit->tree, p, NULL, "");
 154                show_commit(commit);
 155        }
 156        for (pending = revs->pending_objects; pending; pending = pending->next) {
 157                struct object *obj = pending->item;
 158                const char *name = pending->name;
 159                if (obj->flags & (UNINTERESTING | SEEN))
 160                        continue;
 161                if (obj->type == tag_type) {
 162                        obj->flags |= SEEN;
 163                        p = add_object(obj, p, NULL, name);
 164                        continue;
 165                }
 166                if (obj->type == tree_type) {
 167                        p = process_tree((struct tree *)obj, p, NULL, name);
 168                        continue;
 169                }
 170                if (obj->type == blob_type) {
 171                        p = process_blob((struct blob *)obj, p, NULL, name);
 172                        continue;
 173                }
 174                die("unknown pending object %s (%s)", sha1_to_hex(obj->sha1), name);
 175        }
 176        while (objects) {
 177                /* An object with name "foo\n0000000..." can be used to
 178                 * confuse downstream git-pack-objects very badly.
 179                 */
 180                const char *ep = strchr(objects->name, '\n');
 181                if (ep) {
 182                        printf("%s %.*s\n", sha1_to_hex(objects->item->sha1),
 183                               (int) (ep - objects->name),
 184                               objects->name);
 185                }
 186                else
 187                        printf("%s %s\n", sha1_to_hex(objects->item->sha1), objects->name);
 188                objects = objects->next;
 189        }
 190}
 191
 192/*
 193 * This is a truly stupid algorithm, but it's only
 194 * used for bisection, and we just don't care enough.
 195 *
 196 * We care just barely enough to avoid recursing for
 197 * non-merge entries.
 198 */
 199static int count_distance(struct commit_list *entry)
 200{
 201        int nr = 0;
 202
 203        while (entry) {
 204                struct commit *commit = entry->item;
 205                struct commit_list *p;
 206
 207                if (commit->object.flags & (UNINTERESTING | COUNTED))
 208                        break;
 209                if (!revs.prune_fn || (commit->object.flags & TREECHANGE))
 210                        nr++;
 211                commit->object.flags |= COUNTED;
 212                p = commit->parents;
 213                entry = p;
 214                if (p) {
 215                        p = p->next;
 216                        while (p) {
 217                                nr += count_distance(p);
 218                                p = p->next;
 219                        }
 220                }
 221        }
 222
 223        return nr;
 224}
 225
 226static void clear_distance(struct commit_list *list)
 227{
 228        while (list) {
 229                struct commit *commit = list->item;
 230                commit->object.flags &= ~COUNTED;
 231                list = list->next;
 232        }
 233}
 234
 235static struct commit_list *find_bisection(struct commit_list *list)
 236{
 237        int nr, closest;
 238        struct commit_list *p, *best;
 239
 240        nr = 0;
 241        p = list;
 242        while (p) {
 243                if (!revs.prune_fn || (p->item->object.flags & TREECHANGE))
 244                        nr++;
 245                p = p->next;
 246        }
 247        closest = 0;
 248        best = list;
 249
 250        for (p = list; p; p = p->next) {
 251                int distance;
 252
 253                if (revs.prune_fn && !(p->item->object.flags & TREECHANGE))
 254                        continue;
 255
 256                distance = count_distance(p);
 257                clear_distance(list);
 258                if (nr - distance < distance)
 259                        distance = nr - distance;
 260                if (distance > closest) {
 261                        best = p;
 262                        closest = distance;
 263                }
 264        }
 265        if (best)
 266                best->next = NULL;
 267        return best;
 268}
 269
 270static void mark_edge_parents_uninteresting(struct commit *commit)
 271{
 272        struct commit_list *parents;
 273
 274        for (parents = commit->parents; parents; parents = parents->next) {
 275                struct commit *parent = parents->item;
 276                if (!(parent->object.flags & UNINTERESTING))
 277                        continue;
 278                mark_tree_uninteresting(parent->tree);
 279                if (revs.edge_hint && !(parent->object.flags & SHOWN)) {
 280                        parent->object.flags |= SHOWN;
 281                        printf("-%s\n", sha1_to_hex(parent->object.sha1));
 282                }
 283        }
 284}
 285
 286static void mark_edges_uninteresting(struct commit_list *list)
 287{
 288        for ( ; list; list = list->next) {
 289                struct commit *commit = list->item;
 290
 291                if (commit->object.flags & UNINTERESTING) {
 292                        mark_tree_uninteresting(commit->tree);
 293                        continue;
 294                }
 295                mark_edge_parents_uninteresting(commit);
 296        }
 297}
 298
 299int cmd_rev_list(int argc, const char **argv, char **envp)
 300{
 301        struct commit_list *list;
 302        int i;
 303
 304        init_revisions(&revs);
 305        revs.abbrev = 0;
 306        revs.commit_format = CMIT_FMT_UNSPECIFIED;
 307        argc = setup_revisions(argc, argv, &revs, NULL);
 308
 309        for (i = 1 ; i < argc; i++) {
 310                const char *arg = argv[i];
 311
 312                if (!strcmp(arg, "--header")) {
 313                        revs.verbose_header = 1;
 314                        continue;
 315                }
 316                if (!strcmp(arg, "--timestamp")) {
 317                        show_timestamp = 1;
 318                        continue;
 319                }
 320                if (!strcmp(arg, "--bisect")) {
 321                        bisect_list = 1;
 322                        continue;
 323                }
 324                usage(rev_list_usage);
 325
 326        }
 327        if (revs.commit_format != CMIT_FMT_UNSPECIFIED) {
 328                /* The command line has a --pretty  */
 329                hdr_termination = '\n';
 330                if (revs.commit_format == CMIT_FMT_ONELINE)
 331                        header_prefix = "";
 332                else
 333                        header_prefix = "commit ";
 334        }
 335        else if (revs.verbose_header)
 336                /* Only --header was specified */
 337                revs.commit_format = CMIT_FMT_RAW;
 338
 339        list = revs.commits;
 340
 341        if ((!list &&
 342             (!(revs.tag_objects||revs.tree_objects||revs.blob_objects) &&
 343              !revs.pending_objects)) ||
 344            revs.diff)
 345                usage(rev_list_usage);
 346
 347        save_commit_buffer = revs.verbose_header;
 348        track_object_refs = 0;
 349        if (bisect_list)
 350                revs.limited = 1;
 351
 352        prepare_revision_walk(&revs);
 353        if (revs.tree_objects)
 354                mark_edges_uninteresting(revs.commits);
 355
 356        if (bisect_list)
 357                revs.commits = find_bisection(revs.commits);
 358
 359        show_commit_list(&revs);
 360
 361        return 0;
 362}