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         else if (revs.left_right) {
  58                 if (commit->object.flags & SYMMETRIC_LEFT)
  59                         putchar('<');
  60                 else
  61                         putchar('>');
  62         }
  63         if (revs.abbrev_commit && revs.abbrev)
  64                 fputs(find_unique_abbrev(commit->object.sha1, revs.abbrev),
  65                       stdout);
  66         else
  67                 fputs(sha1_to_hex(commit->object.sha1), stdout);
  68         if (revs.parents) {
  69                 struct commit_list *parents = commit->parents;
  70                 while (parents) {
  71                         struct object *o = &(parents->item->object);
  72                         parents = parents->next;
  73                         if (o->flags & TMP_MARK)
  74                                 continue;
  75                         printf(" %s", sha1_to_hex(o->sha1));
  76                         o->flags |= TMP_MARK;
  77                 }
  78                 /* TMP_MARK is a general purpose flag that can
  79                  * be used locally, but the user should clean
  80                  * things up after it is done with them.
  81                  */
  82                 for (parents = commit->parents;
  83                      parents;
  84                      parents = parents->next)
  85                         parents->item->object.flags &= ~TMP_MARK;
  86         }
  87         if (revs.commit_format == CMIT_FMT_ONELINE)
  88                 putchar(' ');
  89         else
  90                 putchar('\n');
  91
  92         if (revs.verbose_header) {
  93                 static char pretty_header[16384];
  94                 pretty_print_commit(revs.commit_format, commit, ~0,
  95                                     pretty_header, sizeof(pretty_header),
  96                                     revs.abbrev, NULL, NULL, revs.relative_date);
  97                 printf("%s%c", pretty_header, hdr_termination);
  98         }
  99         fflush(stdout);
 100         if (commit->parents) {
 101                 free_commit_list(commit->parents);
 102                 commit->parents = NULL;
 103         }
 104         free(commit->buffer);
 105         commit->buffer = NULL;
 106 }
 107
 108 static void show_object(struct object_array_entry *p)
 109 {
 110         /* An object with name "foo\n0000000..." can be used to
 111          * confuse downstream git-pack-objects very badly.
 112          */
 113         const char *ep = strchr(p->name, '\n');
 114         if (ep) {
 115                 printf("%s %.*s\n", sha1_to_hex(p->item->sha1),
 116                        (int) (ep - p->name),
 117                        p->name);
 118         }
 119         else
 120                 printf("%s %s\n", sha1_to_hex(p->item->sha1), p->name);
 121 }
 122
 123 static void show_edge(struct commit *commit)
 124 {
 125         printf("-%s\n", sha1_to_hex(commit->object.sha1));
 126 }
 127
 128 /*
 129  * This is a truly stupid algorithm, but it's only
 130  * used for bisection, and we just don't care enough.
 131  *
 132  * We care just barely enough to avoid recursing for
 133  * non-merge entries.
 134  */
 135 static int count_distance(struct commit_list *entry)
 136 {
 137         int nr = 0;
 138
 139         while (entry) {
 140                 struct commit *commit = entry->item;
 141                 struct commit_list *p;
 142
 143                 if (commit->object.flags & (UNINTERESTING | COUNTED))
 144                         break;
 145                 if (!revs.prune_fn || (commit->object.flags & TREECHANGE))
 146                         nr++;
 147                 commit->object.flags |= COUNTED;
 148                 p = commit->parents;
 149                 entry = p;
 150                 if (p) {
 151                         p = p->next;
 152                         while (p) {
 153                                 nr += count_distance(p);
 154                                 p = p->next;
 155                         }
 156                 }
 157         }
 158
 159         return nr;
 160 }
 161
 162 static void clear_distance(struct commit_list *list)
 163 {
 164         while (list) {
 165                 struct commit *commit = list->item;
 166                 commit->object.flags &= ~COUNTED;
 167                 list = list->next;
 168         }
 169 }
 170
 171 static struct commit_list *find_bisection(struct commit_list *list)
 172 {
 173         int nr, closest;
 174         struct commit_list *p, *best;
 175
 176         nr = 0;
 177         p = list;
 178         while (p) {
 179                 if (!revs.prune_fn || (p->item->object.flags & TREECHANGE))
 180                         nr++;
 181                 p = p->next;
 182         }
 183         closest = 0;
 184         best = list;
 185
 186         for (p = list; p; p = p->next) {
 187                 int distance;
 188
 189                 if (revs.prune_fn && !(p->item->object.flags & TREECHANGE))
 190                         continue;
 191
 192                 distance = count_distance(p);
 193                 clear_distance(list);
 194                 if (nr - distance < distance)
 195                         distance = nr - distance;
 196                 if (distance > closest) {
 197                         best = p;
 198                         closest = distance;
 199                 }
 200         }
 201         if (best)
 202                 best->next = NULL;
 203         return best;
 204 }
 205
 206 static void read_revisions_from_stdin(struct rev_info *revs)
 207 {
 208         char line[1000];
 209
 210         while (fgets(line, sizeof(line), stdin) != NULL) {
 211                 int len = strlen(line);
 212                 if (line[len - 1] == '\n')
 213                         line[--len] = 0;
 214                 if (!len)
 215                         break;
 216                 if (line[0] == '-')
 217                         die("options not supported in --stdin mode");
 218                 if (handle_revision_arg(line, revs, 0, 1))
 219                         die("bad revision '%s'", line);
 220         }
 221 }
 222
 223 int cmd_rev_list(int argc, const char **argv, const char *prefix)
 224 {
 225         struct commit_list *list;
 226         int i;
 227         int read_from_stdin = 0;
 228
 229         init_revisions(&revs, prefix);
 230         revs.abbrev = 0;
 231         revs.commit_format = CMIT_FMT_UNSPECIFIED;
 232         argc = setup_revisions(argc, argv, &revs, NULL);
 233
 234         for (i = 1 ; i < argc; i++) {
 235                 const char *arg = argv[i];
 236
 237                 if (!strcmp(arg, "--header")) {
 238                         revs.verbose_header = 1;
 239                         continue;
 240                 }
 241                 if (!strcmp(arg, "--timestamp")) {
 242                         show_timestamp = 1;
 243                         continue;
 244                 }
 245                 if (!strcmp(arg, "--bisect")) {
 246                         bisect_list = 1;
 247                         continue;
 248                 }
 249                 if (!strcmp(arg, "--stdin")) {
 250                         if (read_from_stdin++)
 251                                 die("--stdin given twice?");
 252                         read_revisions_from_stdin(&revs);
 253                         continue;
 254                 }
 255                 usage(rev_list_usage);
 256
 257         }
 258         if (revs.commit_format != CMIT_FMT_UNSPECIFIED) {
 259                 /* The command line has a --pretty  */
 260                 hdr_termination = '\n';
 261                 if (revs.commit_format == CMIT_FMT_ONELINE)
 262                         header_prefix = "";
 263                 else
 264                         header_prefix = "commit ";
 265         }
 266         else if (revs.verbose_header)
 267                 /* Only --header was specified */
 268                 revs.commit_format = CMIT_FMT_RAW;
 269
 270         list = revs.commits;
 271
 272         if ((!list &&
 273              (!(revs.tag_objects||revs.tree_objects||revs.blob_objects) &&
 274               !revs.pending.nr)) ||
 275             revs.diff)
 276                 usage(rev_list_usage);
 277
 278         save_commit_buffer = revs.verbose_header || revs.grep_filter;
 279         track_object_refs = 0;
 280         if (bisect_list)
 281                 revs.limited = 1;
 282
 283         prepare_revision_walk(&revs);
 284         if (revs.tree_objects)
 285                 mark_edges_uninteresting(revs.commits, &revs, show_edge);
 286
 287         if (bisect_list)
 288                 revs.commits = find_bisection(revs.commits);
 289
 290         traverse_commit_list(&revs, show_commit, show_object);
 291
 292         return 0;
 293 }