rev-list.c

   1 #include "cache.h"
   2 #include "commit.h"
   3 #include "epoch.h"
   4
   5 #define SEEN            (1u << 0)
   6 #define INTERESTING     (1u << 1)
   7 #define COUNTED         (1u << 2)
   8
   9 static const char rev_list_usage[] =
  10         "usage: git-rev-list [OPTION] commit-id <commit-id>\n"
  11                       "  --max-count=nr\n"
  12                       "  --max-age=epoch\n"
  13                       "  --min-age=epoch\n"
  14                       "  --header\n"
  15                       "  --pretty\n"
  16                       "  --merge-order [ --show-breaks ]";
  17
  18 static int bisect_list = 0;
  19 static int verbose_header = 0;
  20 static int show_parents = 0;
  21 static int hdr_termination = 0;
  22 static const char *prefix = "";
  23 static unsigned long max_age = -1;
  24 static unsigned long min_age = -1;
  25 static int max_count = -1;
  26 static enum cmit_fmt commit_format = CMIT_FMT_RAW;
  27 static int merge_order = 0;
  28 static int show_breaks = 0;
  29
  30 static void show_commit(struct commit *commit)
  31 {
  32         if (show_breaks) {
  33                 prefix = "| ";
  34                 if (commit->object.flags & DISCONTINUITY) {
  35                         prefix = "^ ";
  36                 } else if (commit->object.flags & BOUNDARY) {
  37                         prefix = "= ";
  38                 }
  39         }
  40         printf("%s%s", prefix, sha1_to_hex(commit->object.sha1));
  41         if (show_parents) {
  42                 struct commit_list *parents = commit->parents;
  43                 while (parents) {
  44                         printf(" %s", sha1_to_hex(parents->item->object.sha1));
  45                         parents = parents->next;
  46                 }
  47         }
  48         putchar('\n');
  49         if (verbose_header) {
  50                 static char pretty_header[16384];
  51                 pretty_print_commit(commit_format, commit->buffer, ~0, pretty_header, sizeof(pretty_header));
  52                 printf("%s%c", pretty_header, hdr_termination);
  53         }
  54 }
  55
  56 static int filter_commit(struct commit * commit)
  57 {
  58         if (commit->object.flags & UNINTERESTING)
  59                 return CONTINUE;
  60         if (min_age != -1 && (commit->date > min_age))
  61                 return CONTINUE;
  62         if (max_age != -1 && (commit->date < max_age))
  63                 return STOP;
  64         if (max_count != -1 && !max_count--)
  65                 return STOP;
  66
  67         return DO;
  68 }
  69
  70 static int process_commit(struct commit * commit)
  71 {
  72         int action=filter_commit(commit);
  73
  74         if (action == STOP) {
  75                 return STOP;
  76         }
  77
  78         if (action == CONTINUE) {
  79                 return CONTINUE;
  80         }
  81
  82         show_commit(commit);
  83
  84         return CONTINUE;
  85 }
  86
  87 static void show_commit_list(struct commit_list *list)
  88 {
  89         while (list) {
  90                 struct commit *commit = pop_most_recent_commit(&list, SEEN);
  91
  92                 if (process_commit(commit) == STOP)
  93                         break;
  94         }
  95 }
  96
  97 static void mark_parents_uninteresting(struct commit *commit)
  98 {
  99         struct commit_list *parents = commit->parents;
 100
 101         while (parents) {
 102                 struct commit *commit = parents->item;
 103                 commit->object.flags |= UNINTERESTING;
 104                 parents = parents->next;
 105         }
 106 }
 107
 108 static int everybody_uninteresting(struct commit_list *list)
 109 {
 110         while (list) {
 111                 struct commit *commit = list->item;
 112                 list = list->next;
 113                 if (commit->object.flags & UNINTERESTING)
 114                         continue;
 115                 return 0;
 116         }
 117         return 1;
 118 }
 119
 120 /*
 121  * This is a truly stupid algorithm, but it's only
 122  * used for bisection, and we just don't care enough.
 123  *
 124  * We care just barely enough to avoid recursing for
 125  * non-merge entries.
 126  */
 127 static int count_distance(struct commit_list *entry)
 128 {
 129         int nr = 0;
 130
 131         while (entry) {
 132                 struct commit *commit = entry->item;
 133                 struct commit_list *p;
 134
 135                 if (commit->object.flags & (UNINTERESTING | COUNTED))
 136                         break;
 137                 nr++;
 138                 commit->object.flags |= COUNTED;
 139                 p = commit->parents;
 140                 entry = p;
 141                 if (p) {
 142                         p = p->next;
 143                         while (p) {
 144                                 nr += count_distance(p);
 145                                 p = p->next;
 146                         }
 147                 }
 148         }
 149         return nr;
 150 }
 151
 152 static int clear_distance(struct commit_list *list)
 153 {
 154         while (list) {
 155                 struct commit *commit = list->item;
 156                 commit->object.flags &= ~COUNTED;
 157                 list = list->next;
 158         }
 159 }
 160
 161 static struct commit_list *find_bisection(struct commit_list *list)
 162 {
 163         int nr, closest;
 164         struct commit_list *p, *best;
 165
 166         nr = 0;
 167         p = list;
 168         while (p) {
 169                 nr++;
 170                 p = p->next;
 171         }
 172         closest = 0;
 173         best = list;
 174
 175         p = list;
 176         while (p) {
 177                 int distance = count_distance(p);
 178                 clear_distance(list);
 179                 if (nr - distance < distance)
 180                         distance = nr - distance;
 181                 if (distance > closest) {
 182                         best = p;
 183                         closest = distance;
 184                 }
 185                 p = p->next;
 186         }
 187         if (best)
 188                 best->next = NULL;
 189         return best;
 190 }
 191
 192 struct commit_list *limit_list(struct commit_list *list)
 193 {
 194         struct commit_list *newlist = NULL;
 195         struct commit_list **p = &newlist;
 196         do {
 197                 struct commit *commit = pop_most_recent_commit(&list, SEEN);
 198                 struct object *obj = &commit->object;
 199
 200                 if (obj->flags & UNINTERESTING) {
 201                         mark_parents_uninteresting(commit);
 202                         if (everybody_uninteresting(list))
 203                                 break;
 204                         continue;
 205                 }
 206                 p = &commit_list_insert(commit, p)->next;
 207         } while (list);
 208         if (bisect_list)
 209                 newlist = find_bisection(newlist);
 210         return newlist;
 211 }
 212
 213 static enum cmit_fmt get_commit_format(const char *arg)
 214 {
 215         if (!*arg)
 216                 return CMIT_FMT_DEFAULT;
 217         if (!strcmp(arg, "=raw"))
 218                 return CMIT_FMT_RAW;
 219         if (!strcmp(arg, "=medium"))
 220                 return CMIT_FMT_MEDIUM;
 221         if (!strcmp(arg, "=short"))
 222                 return CMIT_FMT_SHORT;
 223         usage(rev_list_usage);
 224 }
 225
 226
 227 int main(int argc, char **argv)
 228 {
 229         struct commit_list *list = NULL;
 230         int i, limited = 0;
 231
 232         for (i = 1 ; i < argc; i++) {
 233                 int flags;
 234                 char *arg = argv[i];
 235                 unsigned char sha1[20];
 236                 struct commit *commit;
 237
 238                 if (!strncmp(arg, "--max-count=", 12)) {
 239                         max_count = atoi(arg + 12);
 240                         continue;
 241                 }
 242                 if (!strncmp(arg, "--max-age=", 10)) {
 243                         max_age = atoi(arg + 10);
 244                         continue;
 245                 }
 246                 if (!strncmp(arg, "--min-age=", 10)) {
 247                         min_age = atoi(arg + 10);
 248                         continue;
 249                 }
 250                 if (!strcmp(arg, "--header")) {
 251                         verbose_header = 1;
 252                         continue;
 253                 }
 254                 if (!strncmp(arg, "--pretty", 8)) {
 255                         commit_format = get_commit_format(arg+8);
 256                         verbose_header = 1;
 257                         hdr_termination = '\n';
 258                         prefix = "commit ";
 259                         continue;
 260                 }
 261                 if (!strcmp(arg, "--parents")) {
 262                         show_parents = 1;
 263                         continue;
 264                 }
 265                 if (!strcmp(arg, "--bisect")) {
 266                         bisect_list = 1;
 267                         continue;
 268                 }
 269                 if (!strncmp(arg, "--merge-order", 13)) {
 270                         merge_order = 1;
 271                         continue;
 272                 }
 273                 if (!strncmp(arg, "--show-breaks", 13)) {
 274                         show_breaks = 1;
 275                         continue;
 276                 }
 277
 278                 flags = 0;
 279                 if (*arg == '^') {
 280                         flags = UNINTERESTING;
 281                         arg++;
 282                         limited = 1;
 283                 }
 284                 if (get_sha1(arg, sha1) || (show_breaks && !merge_order))
 285                         usage(rev_list_usage);
 286                 commit = lookup_commit_reference(sha1);
 287                 if (!commit || parse_commit(commit) < 0)
 288                         die("bad commit object %s", arg);
 289                 commit->object.flags |= flags;
 290                 commit_list_insert(commit, &list);
 291         }
 292
 293         if (!list)
 294                 usage(rev_list_usage);
 295
 296         if (!merge_order) {
 297                 if (limited)
 298                         list = limit_list(list);
 299                 show_commit_list(list);
 300         } else {
 301                 if (sort_list_in_merge_order(list, &process_commit)) {
 302                           die("merge order sort failed\n");
 303                 }
 304         }
 305
 306         return 0;
 307 }