builtin-diff-index.c

   1 #include "cache.h"
   2 #include "diff.h"
   3 #include "commit.h"
   4 #include "revision.h"
   5 #include "builtin.h"
   6
   7 static const char diff_cache_usage[] =
   8 "git-diff-index [-m] [--cached] "
   9 "[<common diff options>] <tree-ish> [<path>...]"
  10 COMMON_DIFF_OPTIONS_HELP;
  11
  12 int cmd_diff_index(int argc, const char **argv, const char *prefix)
  13 {
  14         struct rev_info rev;
  15         int cached = 0;
  16         int i;
  17
  18         init_revisions(&rev, prefix);
  19         git_config(git_default_config); /* no "diff" UI options */
  20         rev.abbrev = 0;
  21
  22         argc = setup_revisions(argc, argv, &rev, NULL);
  23         for (i = 1; i < argc; i++) {
  24                 const char *arg = argv[i];
  25
  26                 if (!strcmp(arg, "--cached"))
  27                         cached = 1;
  28                 else
  29                         usage(diff_cache_usage);
  30         }
  31         if (!rev.diffopt.output_format)
  32                 rev.diffopt.output_format = DIFF_FORMAT_RAW;
  33
  34         /*
  35          * Make sure there is one revision (i.e. pending object),
  36          * and there is no revision filtering parameters.
  37          */
  38         if (rev.pending.nr != 1 ||
  39             rev.max_count != -1 || rev.min_age != -1 || rev.max_age != -1)
  40                 usage(diff_cache_usage);
  41         if (read_cache() < 0) {
  42                 perror("read_cache");
  43                 return -1;
  44         }
  45         return run_diff_index(&rev, cached);
  46 }