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 #include "submodule.h"
   7
   8 static const char diff_cache_usage[] =
   9 "git diff-index [-m] [--cached] "
  10 "[<common diff options>] <tree-ish> [<path>...]"
  11 COMMON_DIFF_OPTIONS_HELP;
  12
  13 int cmd_diff_index(int argc, const char **argv, const char *prefix)
  14 {
  15         struct rev_info rev;
  16         int cached = 0;
  17         int i;
  18         int result;
  19
  20         init_revisions(&rev, prefix);
  21         gitmodules_config();
  22         git_config(git_diff_basic_config, NULL); /* no "diff" UI options */
  23         rev.abbrev = 0;
  24
  25         argc = setup_revisions(argc, argv, &rev, NULL);
  26         for (i = 1; i < argc; i++) {
  27                 const char *arg = argv[i];
  28
  29                 if (!strcmp(arg, "--cached"))
  30                         cached = 1;
  31                 else
  32                         usage(diff_cache_usage);
  33         }
  34         if (!rev.diffopt.output_format)
  35                 rev.diffopt.output_format = DIFF_FORMAT_RAW;
  36
  37         /*
  38          * Make sure there is one revision (i.e. pending object),
  39          * and there is no revision filtering parameters.
  40          */
  41         if (rev.pending.nr != 1 ||
  42             rev.max_count != -1 || rev.min_age != -1 || rev.max_age != -1)
  43                 usage(diff_cache_usage);
  44         if (!cached) {
  45                 setup_work_tree();
  46                 if (read_cache_preload(rev.diffopt.pathspec.raw) < 0) {
  47                         perror("read_cache_preload");
  48                         return -1;
  49                 }
  50         } else if (read_cache() < 0) {
  51                 perror("read_cache");
  52                 return -1;
  53         }
  54         result = run_diff_index(&rev, cached);
  55         return diff_result_code(&rev.diffopt, result);
  56 }