git-export.c

   1 #include "cache.h"
   2 #include "commit.h"
   3
   4 /*
   5  * Show one commit
   6  */
   7 void show_commit(struct commit *commit)
   8 {
   9         char cmdline[400];
  10         char hex[100];
  11
  12         strcpy(hex, sha1_to_hex(commit->object.sha1));
  13         printf("Id: %s\n", hex);
  14         fflush(NULL);
  15         sprintf(cmdline, "cat-file commit %s", hex);
  16         system(cmdline);
  17         if (commit->parents) {
  18                 char *against = sha1_to_hex(commit->parents->item->object.sha1);
  19                 printf("\n\n======== diff against %s ========\n", against);
  20                 fflush(NULL);
  21                 sprintf(cmdline, "git diff %s %s", against, hex);
  22                 system(cmdline);
  23         }
  24         printf("======== end ========\n\n");
  25 }
  26
  27 /*
  28  * Show all unseen commits, depth-first
  29  */
  30 void show_unseen(struct commit *top)
  31 {
  32         struct commit_list *parents;
  33
  34         if (top->object.flags & 2)
  35                 return;
  36         top->object.flags |= 2;
  37         parents = top->parents;
  38         while (parents) {
  39                 show_unseen(parents->item);
  40                 parents = parents->next;
  41         }
  42         show_commit(top);
  43 }
  44
  45 void export(struct commit *top, struct commit *base)
  46 {
  47         mark_reachable(&top->object, 1);
  48         if (base)
  49                 mark_reachable(&base->object, 2);
  50         show_unseen(top);
  51 }
  52
  53 struct commit *get_commit(unsigned char *sha1)
  54 {
  55         struct commit *commit = lookup_commit(sha1);
  56         if (!commit->object.parsed) {
  57                 struct commit_list *parents;
  58
  59                 if (parse_commit(commit) < 0)
  60                         die("unable to parse commit %s", sha1_to_hex(sha1));
  61                 parents = commit->parents;
  62                 while (parents) {
  63                         get_commit(parents->item->object.sha1);
  64                         parents = parents->next;
  65                 }
  66         }
  67         return commit;
  68 }
  69
  70 int main(int argc, char **argv)
  71 {
  72         unsigned char base_sha1[20];
  73         unsigned char top_sha1[20];
  74
  75         if (argc < 2 || argc > 4 ||
  76             get_sha1_hex(argv[1], top_sha1) ||
  77             (argc == 3 && get_sha1_hex(argv[2], base_sha1)))
  78                 usage("git-export top [base]");
  79         export(get_commit(top_sha1), argc==3 ? get_commit(base_sha1) : NULL);
  80         return 0;
  81 }