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
  17 static 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
  42 static struct rev_info revs;
  43
  44 static int bisect_list;
  45 static int show_timestamp;
  46 static int hdr_termination;
  47 static const char *header_prefix;
  48
  49 static 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
 102 static 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
 117 /*
 118  * This is a truly stupid algorithm, but it's only
 119  * used for bisection, and we just don't care enough.
 120  *
 121  * We care just barely enough to avoid recursing for
 122  * non-merge entries.
 123  */
 124 static int count_distance(struct commit_list *entry)
 125 {
 126         int nr = 0;
 127
 128         while (entry) {
 129                 struct commit *commit = entry->item;
 130                 struct commit_list *p;
 131
 132                 if (commit->object.flags & (UNINTERESTING | COUNTED))
 133                         break;
 134                 if (!revs.prune_fn || (commit->object.flags & TREECHANGE))
 135                         nr++;
 136                 commit->object.flags |= COUNTED;
 137                 p = commit->parents;
 138                 entry = p;
 139                 if (p) {
 140                         p = p->next;
 141                         while (p) {
 142                                 nr += count_distance(p);
 143                                 p = p->next;
 144                         }
 145                 }
 146         }
 147
 148         return nr;
 149 }
 150
 151 static void clear_distance(struct commit_list *list)
 152 {
 153         while (list) {
 154                 struct commit *commit = list->item;
 155                 commit->object.flags &= ~COUNTED;
 156                 list = list->next;
 157         }
 158 }
 159
 160 static struct commit_list *find_bisection(struct commit_list *list)
 161 {
 162         int nr, closest;
 163         struct commit_list *p, *best;
 164
 165         nr = 0;
 166         p = list;
 167         while (p) {
 168                 if (!revs.prune_fn || (p->item->object.flags & TREECHANGE))
 169                         nr++;
 170                 p = p->next;
 171         }
 172         closest = 0;
 173         best = list;
 174
 175         for (p = list; p; p = p->next) {
 176                 int distance;
 177
 178                 if (revs.prune_fn && !(p->item->object.flags & TREECHANGE))
 179                         continue;
 180
 181                 distance = count_distance(p);
 182                 clear_distance(list);
 183                 if (nr - distance < distance)
 184                         distance = nr - distance;
 185                 if (distance > closest) {
 186                         best = p;
 187                         closest = distance;
 188                 }
 189         }
 190         if (best)
 191                 best->next = NULL;
 192         return best;
 193 }
 194
 195 static void mark_edge_parents_uninteresting(struct commit *commit)
 196 {
 197         struct commit_list *parents;
 198
 199         for (parents = commit->parents; parents; parents = parents->next) {
 200                 struct commit *parent = parents->item;
 201                 if (!(parent->object.flags & UNINTERESTING))
 202                         continue;
 203                 mark_tree_uninteresting(parent->tree);
 204                 if (revs.edge_hint && !(parent->object.flags & SHOWN)) {
 205                         parent->object.flags |= SHOWN;
 206                         printf("-%s\n", sha1_to_hex(parent->object.sha1));
 207                 }
 208         }
 209 }
 210
 211 static void mark_edges_uninteresting(struct commit_list *list)
 212 {
 213         for ( ; list; list = list->next) {
 214                 struct commit *commit = list->item;
 215
 216                 if (commit->object.flags & UNINTERESTING) {
 217                         mark_tree_uninteresting(commit->tree);
 218                         continue;
 219                 }
 220                 mark_edge_parents_uninteresting(commit);
 221         }
 222 }
 223
 224 static void read_revisions_from_stdin(struct rev_info *revs)
 225 {
 226         char line[1000];
 227
 228         while (fgets(line, sizeof(line), stdin) != NULL) {
 229                 int len = strlen(line);
 230                 if (line[len - 1] == '\n')
 231                         line[--len] = 0;
 232                 if (!len)
 233                         break;
 234                 if (line[0] == '-')
 235                         die("options not supported in --stdin mode");
 236                 if (handle_revision_arg(line, revs, 0, 1))
 237                         die("bad revision '%s'", line);
 238         }
 239 }
 240
 241 int cmd_rev_list(int argc, const char **argv, const char *prefix)
 242 {
 243         struct commit_list *list;
 244         int i;
 245         int read_from_stdin = 0;
 246
 247         init_revisions(&revs, prefix);
 248         revs.abbrev = 0;
 249         revs.commit_format = CMIT_FMT_UNSPECIFIED;
 250         argc = setup_revisions(argc, argv, &revs, NULL);
 251
 252         for (i = 1 ; i < argc; i++) {
 253                 const char *arg = argv[i];
 254
 255                 if (!strcmp(arg, "--header")) {
 256                         revs.verbose_header = 1;
 257                         continue;
 258                 }
 259                 if (!strcmp(arg, "--timestamp")) {
 260                         show_timestamp = 1;
 261                         continue;
 262                 }
 263                 if (!strcmp(arg, "--bisect")) {
 264                         bisect_list = 1;
 265                         continue;
 266                 }
 267                 if (!strcmp(arg, "--stdin")) {
 268                         if (read_from_stdin++)
 269                                 die("--stdin given twice?");
 270                         read_revisions_from_stdin(&revs);
 271                         continue;
 272                 }
 273                 usage(rev_list_usage);
 274
 275         }
 276         if (revs.commit_format != CMIT_FMT_UNSPECIFIED) {
 277                 /* The command line has a --pretty  */
 278                 hdr_termination = '\n';
 279                 if (revs.commit_format == CMIT_FMT_ONELINE)
 280                         header_prefix = "";
 281                 else
 282                         header_prefix = "commit ";
 283         }
 284         else if (revs.verbose_header)
 285                 /* Only --header was specified */
 286                 revs.commit_format = CMIT_FMT_RAW;
 287
 288         list = revs.commits;
 289
 290         if ((!list &&
 291              (!(revs.tag_objects||revs.tree_objects||revs.blob_objects) &&
 292               !revs.pending.nr)) ||
 293             revs.diff)
 294                 usage(rev_list_usage);
 295
 296         save_commit_buffer = revs.verbose_header;
 297         track_object_refs = 0;
 298         if (bisect_list)
 299                 revs.limited = 1;
 300
 301         prepare_revision_walk(&revs);
 302         if (revs.tree_objects)
 303                 mark_edges_uninteresting(revs.commits);
 304
 305         if (bisect_list)
 306                 revs.commits = find_bisection(revs.commits);
 307
 308         traverse_commit_list(&revs, show_commit, show_object);
 309
 310         return 0;
 311 }