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 "list-objects.h"
  11#include "builtin.h"
  12
  13/* bits #0-15 in revision.h */
  14
  15#define COUNTED         (1u<<16)
  16
  17static const char rev_list_usage[] =
  18"git-rev-list [OPTION] <commit-id>... [ -- paths... ]\n"
  19"  limiting output:\n"
  20"    --max-count=nr\n"
  21"    --max-age=epoch\n"
  22"    --min-age=epoch\n"
  23"    --sparse\n"
  24"    --no-merges\n"
  25"    --remove-empty\n"
  26"    --all\n"
  27"    --stdin\n"
  28"  ordering output:\n"
  29"    --topo-order\n"
  30"    --date-order\n"
  31"  formatting output:\n"
  32"    --parents\n"
  33"    --objects | --objects-edge\n"
  34"    --unpacked\n"
  35"    --header | --pretty\n"
  36"    --abbrev=nr | --no-abbrev\n"
  37"    --abbrev-commit\n"
  38"  special purpose:\n"
  39"    --bisect"
  40;
  41
  42static struct rev_info revs;
  43
  44static int bisect_list;
  45static int show_timestamp;
  46static int hdr_termination;
  47static const char *header_prefix;
  48
  49static void show_commit(struct commit *commit)
  50{
  51        if (show_timestamp)
  52                printf("%lu ", commit->date);
  53        if (header_prefix)
  54                fputs(header_prefix, stdout);
  55        if (commit->object.flags & BOUNDARY)
  56                putchar('-');
  57        if (revs.abbrev_commit && revs.abbrev)
  58                fputs(find_unique_abbrev(commit->object.sha1, revs.abbrev),
  59                      stdout);
  60        else
  61                fputs(sha1_to_hex(commit->object.sha1), stdout);
  62        if (revs.parents) {
  63                struct commit_list *parents = commit->parents;
  64                while (parents) {
  65                        struct object *o = &(parents->item->object);
  66                        parents = parents->next;
  67                        if (o->flags & TMP_MARK)
  68                                continue;
  69                        printf(" %s", sha1_to_hex(o->sha1));
  70                        o->flags |= TMP_MARK;
  71                }
  72                /* TMP_MARK is a general purpose flag that can
  73                 * be used locally, but the user should clean
  74                 * things up after it is done with them.
  75                 */
  76                for (parents = commit->parents;
  77                     parents;
  78                     parents = parents->next)
  79                        parents->item->object.flags &= ~TMP_MARK;
  80        }
  81        if (revs.commit_format == CMIT_FMT_ONELINE)
  82                putchar(' ');
  83        else
  84                putchar('\n');
  85
  86        if (revs.verbose_header) {
  87                static char pretty_header[16384];
  88                pretty_print_commit(revs.commit_format, commit, ~0,
  89                                    pretty_header, sizeof(pretty_header),
  90                                    revs.abbrev, NULL, NULL, revs.relative_date);
  91                printf("%s%c", pretty_header, hdr_termination);
  92        }
  93        fflush(stdout);
  94        if (commit->parents) {
  95                free_commit_list(commit->parents);
  96                commit->parents = NULL;
  97        }
  98        free(commit->buffer);
  99        commit->buffer = NULL;
 100}
 101
 102static void show_object(struct object_array_entry *p)
 103{
 104        /* An object with name "foo\n0000000..." can be used to
 105         * confuse downstream git-pack-objects very badly.
 106         */
 107        const char *ep = strchr(p->name, '\n');
 108        if (ep) {
 109                printf("%s %.*s\n", sha1_to_hex(p->item->sha1),
 110                       (int) (ep - p->name),
 111                       p->name);
 112        }
 113        else
 114                printf("%s %s\n", sha1_to_hex(p->item->sha1), p->name);
 115}
 116
 117static void show_edge(struct commit *commit)
 118{
 119        printf("-%s\n", sha1_to_hex(commit->object.sha1));
 120}
 121
 122/*
 123 * This is a truly stupid algorithm, but it's only
 124 * used for bisection, and we just don't care enough.
 125 *
 126 * We care just barely enough to avoid recursing for
 127 * non-merge entries.
 128 */
 129static int count_distance(struct commit_list *entry)
 130{
 131        int nr = 0;
 132
 133        while (entry) {
 134                struct commit *commit = entry->item;
 135                struct commit_list *p;
 136
 137                if (commit->object.flags & (UNINTERESTING | COUNTED))
 138                        break;
 139                if (!revs.prune_fn || (commit->object.flags & TREECHANGE))
 140                        nr++;
 141                commit->object.flags |= COUNTED;
 142                p = commit->parents;
 143                entry = p;
 144                if (p) {
 145                        p = p->next;
 146                        while (p) {
 147                                nr += count_distance(p);
 148                                p = p->next;
 149                        }
 150                }
 151        }
 152
 153        return nr;
 154}
 155
 156static void clear_distance(struct commit_list *list)
 157{
 158        while (list) {
 159                struct commit *commit = list->item;
 160                commit->object.flags &= ~COUNTED;
 161                list = list->next;
 162        }
 163}
 164
 165static struct commit_list *find_bisection(struct commit_list *list)
 166{
 167        int nr, closest;
 168        struct commit_list *p, *best;
 169
 170        nr = 0;
 171        p = list;
 172        while (p) {
 173                if (!revs.prune_fn || (p->item->object.flags & TREECHANGE))
 174                        nr++;
 175                p = p->next;
 176        }
 177        closest = 0;
 178        best = list;
 179
 180        for (p = list; p; p = p->next) {
 181                int distance;
 182
 183                if (revs.prune_fn && !(p->item->object.flags & TREECHANGE))
 184                        continue;
 185
 186                distance = count_distance(p);
 187                clear_distance(list);
 188                if (nr - distance < distance)
 189                        distance = nr - distance;
 190                if (distance > closest) {
 191                        best = p;
 192                        closest = distance;
 193                }
 194        }
 195        if (best)
 196                best->next = NULL;
 197        return best;
 198}
 199
 200static void read_revisions_from_stdin(struct rev_info *revs)
 201{
 202        char line[1000];
 203
 204        while (fgets(line, sizeof(line), stdin) != NULL) {
 205                int len = strlen(line);
 206                if (line[len - 1] == '\n')
 207                        line[--len] = 0;
 208                if (!len)
 209                        break;
 210                if (line[0] == '-')
 211                        die("options not supported in --stdin mode");
 212                if (handle_revision_arg(line, revs, 0, 1))
 213                        die("bad revision '%s'", line);
 214        }
 215}
 216
 217int cmd_rev_list(int argc, const char **argv, const char *prefix)
 218{
 219        struct commit_list *list;
 220        int i;
 221        int read_from_stdin = 0;
 222
 223        init_revisions(&revs, prefix);
 224        revs.abbrev = 0;
 225        revs.commit_format = CMIT_FMT_UNSPECIFIED;
 226        argc = setup_revisions(argc, argv, &revs, NULL);
 227
 228        for (i = 1 ; i < argc; i++) {
 229                const char *arg = argv[i];
 230
 231                if (!strcmp(arg, "--header")) {
 232                        revs.verbose_header = 1;
 233                        continue;
 234                }
 235                if (!strcmp(arg, "--timestamp")) {
 236                        show_timestamp = 1;
 237                        continue;
 238                }
 239                if (!strcmp(arg, "--bisect")) {
 240                        bisect_list = 1;
 241                        continue;
 242                }
 243                if (!strcmp(arg, "--stdin")) {
 244                        if (read_from_stdin++)
 245                                die("--stdin given twice?");
 246                        read_revisions_from_stdin(&revs);
 247                        continue;
 248                }
 249                usage(rev_list_usage);
 250
 251        }
 252        if (revs.commit_format != CMIT_FMT_UNSPECIFIED) {
 253                /* The command line has a --pretty  */
 254                hdr_termination = '\n';
 255                if (revs.commit_format == CMIT_FMT_ONELINE)
 256                        header_prefix = "";
 257                else
 258                        header_prefix = "commit ";
 259        }
 260        else if (revs.verbose_header)
 261                /* Only --header was specified */
 262                revs.commit_format = CMIT_FMT_RAW;
 263
 264        list = revs.commits;
 265
 266        if ((!list &&
 267             (!(revs.tag_objects||revs.tree_objects||revs.blob_objects) &&
 268              !revs.pending.nr)) ||
 269            revs.diff)
 270                usage(rev_list_usage);
 271
 272        save_commit_buffer = revs.verbose_header || revs.grep_filter;
 273        track_object_refs = 0;
 274        if (bisect_list)
 275                revs.limited = 1;
 276
 277        prepare_revision_walk(&revs);
 278        if (revs.tree_objects)
 279                mark_edges_uninteresting(revs.commits, &revs, show_edge);
 280
 281        if (bisect_list)
 282                revs.commits = find_bisection(revs.commits);
 283
 284        traverse_commit_list(&revs, show_commit, show_object);
 285
 286        return 0;
 287}