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 #define SHOWN           (LAST_EPOCH_FLAG << 2)
   9
  10 static const char rev_list_usage[] =
  11         "usage: git-rev-list [OPTION] commit-id <commit-id>\n"
  12                       "  --max-count=nr\n"
  13                       "  --max-age=epoch\n"
  14                       "  --min-age=epoch\n"
  15                       "  --header\n"
  16                       "  --pretty\n"
  17                       "  --merge-order [ --show-breaks ]";
  18
  19 static int bisect_list = 0;
  20 static int verbose_header = 0;
  21 static int show_parents = 0;
  22 static int hdr_termination = 0;
  23 static const char *prefix = "";
  24 static unsigned long max_age = -1;
  25 static unsigned long min_age = -1;
  26 static int max_count = -1;
  27 static enum cmit_fmt commit_format = CMIT_FMT_RAW;
  28 static int merge_order = 0;
  29 static int show_breaks = 0;
  30
  31 static void show_commit(struct commit *commit)
  32 {
  33         commit->object.flags |= SHOWN;
  34         if (show_breaks) {
  35                 prefix = "| ";
  36                 if (commit->object.flags & DISCONTINUITY) {
  37                         prefix = "^ ";
  38                 } else if (commit->object.flags & BOUNDARY) {
  39                         prefix = "= ";
  40                 }
  41         }
  42         printf("%s%s", prefix, sha1_to_hex(commit->object.sha1));
  43         if (show_parents) {
  44                 struct commit_list *parents = commit->parents;
  45                 while (parents) {
  46                         printf(" %s", sha1_to_hex(parents->item->object.sha1));
  47                         parents = parents->next;
  48                 }
  49         }
  50         putchar('\n');
  51         if (verbose_header) {
  52                 static char pretty_header[16384];
  53                 pretty_print_commit(commit_format, commit->buffer, ~0, pretty_header, sizeof(pretty_header));
  54                 printf("%s%c", pretty_header, hdr_termination);
  55         }
  56 }
  57
  58 static int filter_commit(struct commit * commit)
  59 {
  60         if (commit->object.flags & (UNINTERESTING|SHOWN))
  61                 return CONTINUE;
  62         if (min_age != -1 && (commit->date > min_age))
  63                 return CONTINUE;
  64         if (max_age != -1 && (commit->date < max_age))
  65                 return STOP;
  66         if (max_count != -1 && !max_count--)
  67                 return STOP;
  68         return DO;
  69 }
  70
  71 static int process_commit(struct commit * commit)
  72 {
  73         int action=filter_commit(commit);
  74
  75         if (action == STOP) {
  76                 return STOP;
  77         }
  78
  79         if (action == CONTINUE) {
  80                 return CONTINUE;
  81         }
  82
  83         show_commit(commit);
  84
  85         return CONTINUE;
  86 }
  87
  88 static void show_commit_list(struct commit_list *list)
  89 {
  90         while (list) {
  91                 struct commit *commit = pop_most_recent_commit(&list, SEEN);
  92
  93                 if (process_commit(commit) == STOP)
  94                         break;
  95         }
  96 }
  97
  98 static void mark_parents_uninteresting(struct commit *commit)
  99 {
 100         struct commit_list *parents = commit->parents;
 101
 102         while (parents) {
 103                 struct commit *commit = parents->item;
 104                 commit->object.flags |= UNINTERESTING;
 105                 parents = parents->next;
 106         }
 107 }
 108
 109 static int everybody_uninteresting(struct commit_list *list)
 110 {
 111         while (list) {
 112                 struct commit *commit = list->item;
 113                 list = list->next;
 114                 if (commit->object.flags & UNINTERESTING)
 115                         continue;
 116                 return 0;
 117         }
 118         return 1;
 119 }
 120
 121 /*
 122  * This is a truly stupid algorithm, but it's only
 123  * used for bisection, and we just don't care enough.
 124  *
 125  * We care just barely enough to avoid recursing for
 126  * non-merge entries.
 127  */
 128 static int count_distance(struct commit_list *entry)
 129 {
 130         int nr = 0;
 131
 132         while (entry) {
 133                 struct commit *commit = entry->item;
 134                 struct commit_list *p;
 135
 136                 if (commit->object.flags & (UNINTERESTING | COUNTED))
 137                         break;
 138                 nr++;
 139                 commit->object.flags |= COUNTED;
 140                 p = commit->parents;
 141                 entry = p;
 142                 if (p) {
 143                         p = p->next;
 144                         while (p) {
 145                                 nr += count_distance(p);
 146                                 p = p->next;
 147                         }
 148                 }
 149         }
 150         return nr;
 151 }
 152
 153 static void clear_distance(struct commit_list *list)
 154 {
 155         while (list) {
 156                 struct commit *commit = list->item;
 157                 commit->object.flags &= ~COUNTED;
 158                 list = list->next;
 159         }
 160 }
 161
 162 static struct commit_list *find_bisection(struct commit_list *list)
 163 {
 164         int nr, closest;
 165         struct commit_list *p, *best;
 166
 167         nr = 0;
 168         p = list;
 169         while (p) {
 170                 nr++;
 171                 p = p->next;
 172         }
 173         closest = 0;
 174         best = list;
 175
 176         p = list;
 177         while (p) {
 178                 int distance = count_distance(p);
 179                 clear_distance(list);
 180                 if (nr - distance < distance)
 181                         distance = nr - distance;
 182                 if (distance > closest) {
 183                         best = p;
 184                         closest = distance;
 185                 }
 186                 p = p->next;
 187         }
 188         if (best)
 189                 best->next = NULL;
 190         return best;
 191 }
 192
 193 struct commit_list *limit_list(struct commit_list *list)
 194 {
 195         struct commit_list *newlist = NULL;
 196         struct commit_list **p = &newlist;
 197         do {
 198                 struct commit *commit = pop_most_recent_commit(&list, SEEN);
 199                 struct object *obj = &commit->object;
 200
 201                 if (obj->flags & UNINTERESTING) {
 202                         mark_parents_uninteresting(commit);
 203                         if (everybody_uninteresting(list))
 204                                 break;
 205                         continue;
 206                 }
 207                 p = &commit_list_insert(commit, p)->next;
 208         } while (list);
 209         if (bisect_list)
 210                 newlist = find_bisection(newlist);
 211         return newlist;
 212 }
 213
 214 static enum cmit_fmt get_commit_format(const char *arg)
 215 {
 216         if (!*arg)
 217                 return CMIT_FMT_DEFAULT;
 218         if (!strcmp(arg, "=raw"))
 219                 return CMIT_FMT_RAW;
 220         if (!strcmp(arg, "=medium"))
 221                 return CMIT_FMT_MEDIUM;
 222         if (!strcmp(arg, "=short"))
 223                 return CMIT_FMT_SHORT;
 224         usage(rev_list_usage);
 225 }
 226
 227
 228 int main(int argc, char **argv)
 229 {
 230         struct commit_list *list = NULL;
 231         int i, limited = 0;
 232
 233         for (i = 1 ; i < argc; i++) {
 234                 int flags;
 235                 char *arg = argv[i];
 236                 unsigned char sha1[20];
 237                 struct commit *commit;
 238
 239                 if (!strncmp(arg, "--max-count=", 12)) {
 240                         max_count = atoi(arg + 12);
 241                         continue;
 242                 }
 243                 if (!strncmp(arg, "--max-age=", 10)) {
 244                         max_age = atoi(arg + 10);
 245                         continue;
 246                 }
 247                 if (!strncmp(arg, "--min-age=", 10)) {
 248                         min_age = atoi(arg + 10);
 249                         continue;
 250                 }
 251                 if (!strcmp(arg, "--header")) {
 252                         verbose_header = 1;
 253                         continue;
 254                 }
 255                 if (!strncmp(arg, "--pretty", 8)) {
 256                         commit_format = get_commit_format(arg+8);
 257                         verbose_header = 1;
 258                         hdr_termination = '\n';
 259                         prefix = "commit ";
 260                         continue;
 261                 }
 262                 if (!strcmp(arg, "--parents")) {
 263                         show_parents = 1;
 264                         continue;
 265                 }
 266                 if (!strcmp(arg, "--bisect")) {
 267                         bisect_list = 1;
 268                         continue;
 269                 }
 270                 if (!strncmp(arg, "--merge-order", 13)) {
 271                         merge_order = 1;
 272                         continue;
 273                 }
 274                 if (!strncmp(arg, "--show-breaks", 13)) {
 275                         show_breaks = 1;
 276                         continue;
 277                 }
 278
 279                 flags = 0;
 280                 if (*arg == '^') {
 281                         flags = UNINTERESTING;
 282                         arg++;
 283                         limited = 1;
 284                 }
 285                 if (get_sha1(arg, sha1) || (show_breaks && !merge_order))
 286                         usage(rev_list_usage);
 287                 commit = lookup_commit_reference(sha1);
 288                 if (!commit || parse_commit(commit) < 0)
 289                         die("bad commit object %s", arg);
 290                 commit->object.flags |= flags;
 291                 commit_list_insert(commit, &list);
 292         }
 293
 294         if (!list)
 295                 usage(rev_list_usage);
 296
 297         if (!merge_order) {
 298                 if (limited)
 299                         list = limit_list(list);
 300                 show_commit_list(list);
 301         } else {
 302                 if (sort_list_in_merge_order(list, &process_commit)) {
 303                           die("merge order sort failed\n");
 304                 }
 305         }
 306
 307         return 0;
 308 }