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         int result;
  18
  19         init_revisions(&rev, prefix);
  20         git_config(git_diff_basic_config, NULL); /* no "diff" UI options */
  21         rev.abbrev = 0;
  22
  23         argc = setup_revisions(argc, argv, &rev, NULL);
  24         for (i = 1; i < argc; i++) {
  25                 const char *arg = argv[i];
  26
  27                 if (!strcmp(arg, "--cached"))
  28                         cached = 1;
  29                 else
  30                         usage(diff_cache_usage);
  31         }
  32         if (!rev.diffopt.output_format)
  33                 rev.diffopt.output_format = DIFF_FORMAT_RAW;
  34
  35         /*
  36          * Make sure there is one revision (i.e. pending object),
  37          * and there is no revision filtering parameters.
  38          */
  39         if (rev.pending.nr != 1 ||
  40             rev.max_count != -1 || rev.min_age != -1 || rev.max_age != -1)
  41                 usage(diff_cache_usage);
  42         if (!cached)
  43                 setup_work_tree();
  44         if (read_cache() < 0) {
  45                 perror("read_cache");
  46                 return -1;
  47         }
  48         result = run_diff_index(&rev, cached);
  49         return diff_result_code(&rev.diffopt, result);
  50 }