Andrew's git / gitweb.git / rev-list.c
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rev-list.con commit Documentation: revise top of git man page (23091e9)
   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 "revision.h"
   9
  10/* bits #0-5 in revision.h */
  11
  12#define COUNTED         (1u<<6)
  13
  14static const char rev_list_usage[] =
  15"git-rev-list [OPTION] <commit-id>... [ -- paths... ]\n"
  16"  limiting output:\n"
  17"    --max-count=nr\n"
  18"    --max-age=epoch\n"
  19"    --min-age=epoch\n"
  20"    --sparse\n"
  21"    --no-merges\n"
  22"    --remove-empty\n"
  23"    --all\n"
  24"  ordering output:\n"
  25"    --topo-order\n"
  26"    --date-order\n"
  27"  formatting output:\n"
  28"    --parents\n"
  29"    --objects | --objects-edge\n"
  30"    --unpacked\n"
  31"    --header | --pretty\n"
  32"    --abbrev=nr | --no-abbrev\n"
  33"  special purpose:\n"
  34"    --bisect"
  35;
  36
  37struct rev_info revs;
  38
  39static int bisect_list = 0;
  40static int verbose_header = 0;
  41static int abbrev = DEFAULT_ABBREV;
  42static int show_timestamp = 0;
  43static int hdr_termination = 0;
  44static const char *commit_prefix = "";
  45static enum cmit_fmt commit_format = CMIT_FMT_RAW;
  46
  47static void show_commit(struct commit *commit)
  48{
  49        if (show_timestamp)
  50                printf("%lu ", commit->date);
  51        if (commit_prefix[0])
  52                fputs(commit_prefix, stdout);
  53        if (commit->object.flags & BOUNDARY)
  54                putchar('-');
  55        fputs(sha1_to_hex(commit->object.sha1), stdout);
  56        if (revs.parents) {
  57                struct commit_list *parents = commit->parents;
  58                while (parents) {
  59                        struct object *o = &(parents->item->object);
  60                        parents = parents->next;
  61                        if (o->flags & TMP_MARK)
  62                                continue;
  63                        printf(" %s", sha1_to_hex(o->sha1));
  64                        o->flags |= TMP_MARK;
  65                }
  66                /* TMP_MARK is a general purpose flag that can
  67                 * be used locally, but the user should clean
  68                 * things up after it is done with them.
  69                 */
  70                for (parents = commit->parents;
  71                     parents;
  72                     parents = parents->next)
  73                        parents->item->object.flags &= ~TMP_MARK;
  74        }
  75        if (commit_format == CMIT_FMT_ONELINE)
  76                putchar(' ');
  77        else
  78                putchar('\n');
  79
  80        if (verbose_header) {
  81                static char pretty_header[16384];
  82                pretty_print_commit(commit_format, commit, ~0, pretty_header, sizeof(pretty_header), abbrev);
  83                printf("%s%c", pretty_header, hdr_termination);
  84        }
  85        fflush(stdout);
  86}
  87
  88static struct object_list **process_blob(struct blob *blob,
  89                                         struct object_list **p,
  90                                         struct name_path *path,
  91                                         const char *name)
  92{
  93        struct object *obj = &blob->object;
  94
  95        if (!revs.blob_objects)
  96                return p;
  97        if (obj->flags & (UNINTERESTING | SEEN))
  98                return p;
  99        obj->flags |= SEEN;
 100        return add_object(obj, p, path, name);
 101}
 102
 103static struct object_list **process_tree(struct tree *tree,
 104                                         struct object_list **p,
 105                                         struct name_path *path,
 106                                         const char *name)
 107{
 108        struct object *obj = &tree->object;
 109        struct tree_entry_list *entry;
 110        struct name_path me;
 111
 112        if (!revs.tree_objects)
 113                return p;
 114        if (obj->flags & (UNINTERESTING | SEEN))
 115                return p;
 116        if (parse_tree(tree) < 0)
 117                die("bad tree object %s", sha1_to_hex(obj->sha1));
 118        obj->flags |= SEEN;
 119        p = add_object(obj, p, path, name);
 120        me.up = path;
 121        me.elem = name;
 122        me.elem_len = strlen(name);
 123        entry = tree->entries;
 124        tree->entries = NULL;
 125        while (entry) {
 126                struct tree_entry_list *next = entry->next;
 127                if (entry->directory)
 128                        p = process_tree(entry->item.tree, p, &me, entry->name);
 129                else
 130                        p = process_blob(entry->item.blob, p, &me, entry->name);
 131                free(entry);
 132                entry = next;
 133        }
 134        return p;
 135}
 136
 137static void show_commit_list(struct rev_info *revs)
 138{
 139        struct commit *commit;
 140        struct object_list *objects = NULL, **p = &objects, *pending;
 141
 142        while ((commit = get_revision(revs)) != NULL) {
 143                p = process_tree(commit->tree, p, NULL, "");
 144                show_commit(commit);
 145        }
 146        for (pending = revs->pending_objects; pending; pending = pending->next) {
 147                struct object *obj = pending->item;
 148                const char *name = pending->name;
 149                if (obj->flags & (UNINTERESTING | SEEN))
 150                        continue;
 151                if (obj->type == tag_type) {
 152                        obj->flags |= SEEN;
 153                        p = add_object(obj, p, NULL, name);
 154                        continue;
 155                }
 156                if (obj->type == tree_type) {
 157                        p = process_tree((struct tree *)obj, p, NULL, name);
 158                        continue;
 159                }
 160                if (obj->type == blob_type) {
 161                        p = process_blob((struct blob *)obj, p, NULL, name);
 162                        continue;
 163                }
 164                die("unknown pending object %s (%s)", sha1_to_hex(obj->sha1), name);
 165        }
 166        while (objects) {
 167                /* An object with name "foo\n0000000..." can be used to
 168                 * confuse downstream git-pack-objects very badly.
 169                 */
 170                const char *ep = strchr(objects->name, '\n');
 171                if (ep) {
 172                        printf("%s %.*s\n", sha1_to_hex(objects->item->sha1),
 173                               (int) (ep - objects->name),
 174                               objects->name);
 175                }
 176                else
 177                        printf("%s %s\n", sha1_to_hex(objects->item->sha1), objects->name);
 178                objects = objects->next;
 179        }
 180}
 181
 182/*
 183 * This is a truly stupid algorithm, but it's only
 184 * used for bisection, and we just don't care enough.
 185 *
 186 * We care just barely enough to avoid recursing for
 187 * non-merge entries.
 188 */
 189static int count_distance(struct commit_list *entry)
 190{
 191        int nr = 0;
 192
 193        while (entry) {
 194                struct commit *commit = entry->item;
 195                struct commit_list *p;
 196
 197                if (commit->object.flags & (UNINTERESTING | COUNTED))
 198                        break;
 199                if (!revs.prune_fn || (commit->object.flags & TREECHANGE))
 200                        nr++;
 201                commit->object.flags |= COUNTED;
 202                p = commit->parents;
 203                entry = p;
 204                if (p) {
 205                        p = p->next;
 206                        while (p) {
 207                                nr += count_distance(p);
 208                                p = p->next;
 209                        }
 210                }
 211        }
 212
 213        return nr;
 214}
 215
 216static void clear_distance(struct commit_list *list)
 217{
 218        while (list) {
 219                struct commit *commit = list->item;
 220                commit->object.flags &= ~COUNTED;
 221                list = list->next;
 222        }
 223}
 224
 225static struct commit_list *find_bisection(struct commit_list *list)
 226{
 227        int nr, closest;
 228        struct commit_list *p, *best;
 229
 230        nr = 0;
 231        p = list;
 232        while (p) {
 233                if (!revs.prune_fn || (p->item->object.flags & TREECHANGE))
 234                        nr++;
 235                p = p->next;
 236        }
 237        closest = 0;
 238        best = list;
 239
 240        for (p = list; p; p = p->next) {
 241                int distance;
 242
 243                if (revs.prune_fn && !(p->item->object.flags & TREECHANGE))
 244                        continue;
 245
 246                distance = count_distance(p);
 247                clear_distance(list);
 248                if (nr - distance < distance)
 249                        distance = nr - distance;
 250                if (distance > closest) {
 251                        best = p;
 252                        closest = distance;
 253                }
 254        }
 255        if (best)
 256                best->next = NULL;
 257        return best;
 258}
 259
 260static void mark_edge_parents_uninteresting(struct commit *commit)
 261{
 262        struct commit_list *parents;
 263
 264        for (parents = commit->parents; parents; parents = parents->next) {
 265                struct commit *parent = parents->item;
 266                if (!(parent->object.flags & UNINTERESTING))
 267                        continue;
 268                mark_tree_uninteresting(parent->tree);
 269                if (revs.edge_hint && !(parent->object.flags & SHOWN)) {
 270                        parent->object.flags |= SHOWN;
 271                        printf("-%s\n", sha1_to_hex(parent->object.sha1));
 272                }
 273        }
 274}
 275
 276static void mark_edges_uninteresting(struct commit_list *list)
 277{
 278        for ( ; list; list = list->next) {
 279                struct commit *commit = list->item;
 280
 281                if (commit->object.flags & UNINTERESTING) {
 282                        mark_tree_uninteresting(commit->tree);
 283                        continue;
 284                }
 285                mark_edge_parents_uninteresting(commit);
 286        }
 287}
 288
 289int main(int argc, const char **argv)
 290{
 291        struct commit_list *list;
 292        int i;
 293
 294        argc = setup_revisions(argc, argv, &revs, NULL);
 295
 296        for (i = 1 ; i < argc; i++) {
 297                const char *arg = argv[i];
 298
 299                /* accept -<digit>, like traditilnal "head" */
 300                if ((*arg == '-') && isdigit(arg[1])) {
 301                        revs.max_count = atoi(arg + 1);
 302                        continue;
 303                }
 304                if (!strcmp(arg, "-n")) {
 305                        if (++i >= argc)
 306                                die("-n requires an argument");
 307                        revs.max_count = atoi(argv[i]);
 308                        continue;
 309                }
 310                if (!strncmp(arg,"-n",2)) {
 311                        revs.max_count = atoi(arg + 2);
 312                        continue;
 313                }
 314                if (!strcmp(arg, "--header")) {
 315                        verbose_header = 1;
 316                        continue;
 317                }
 318                if (!strcmp(arg, "--no-abbrev")) {
 319                        abbrev = 0;
 320                        continue;
 321                }
 322                if (!strncmp(arg, "--abbrev=", 9)) {
 323                        abbrev = strtoul(arg + 9, NULL, 10);
 324                        if (abbrev && abbrev < MINIMUM_ABBREV)
 325                                abbrev = MINIMUM_ABBREV;
 326                        else if (40 < abbrev)
 327                                abbrev = 40;
 328                        continue;
 329                }
 330                if (!strncmp(arg, "--pretty", 8)) {
 331                        commit_format = get_commit_format(arg+8);
 332                        verbose_header = 1;
 333                        hdr_termination = '\n';
 334                        if (commit_format == CMIT_FMT_ONELINE)
 335                                commit_prefix = "";
 336                        else
 337                                commit_prefix = "commit ";
 338                        continue;
 339                }
 340                if (!strcmp(arg, "--timestamp")) {
 341                        show_timestamp = 1;
 342                        continue;
 343                }
 344                if (!strcmp(arg, "--bisect")) {
 345                        bisect_list = 1;
 346                        continue;
 347                }
 348                usage(rev_list_usage);
 349
 350        }
 351
 352        list = revs.commits;
 353
 354        if (!list &&
 355            (!(revs.tag_objects||revs.tree_objects||revs.blob_objects) && !revs.pending_objects))
 356                usage(rev_list_usage);
 357
 358        save_commit_buffer = verbose_header;
 359        track_object_refs = 0;
 360
 361        prepare_revision_walk(&revs);
 362        if (revs.tree_objects)
 363                mark_edges_uninteresting(revs.commits);
 364
 365        if (bisect_list)
 366                revs.commits = find_bisection(revs.commits);
 367
 368        show_commit_list(&revs);
 369
 370        return 0;
 371}