builtin/diff-index.c

   1 #include "cache.h"
   2 #include "config.h"
   3 #include "diff.h"
   4 #include "commit.h"
   5 #include "revision.h"
   6 #include "builtin.h"
   7 #include "submodule.h"
   8
   9 static const char diff_cache_usage[] =
  10 "git diff-index [-m] [--cached] "
  11 "[<common-diff-options>] <tree-ish> [<path>...]"
  12 COMMON_DIFF_OPTIONS_HELP;
  13
  14 int cmd_diff_index(int argc, const char **argv, const char *prefix)
  15 {
  16         struct rev_info rev;
  17         int cached = 0;
  18         int i;
  19         int result;
  20
  21         if (argc == 2 && !strcmp(argv[1], "-h"))
  22                 usage(diff_cache_usage);
  23
  24         git_config(git_diff_basic_config, NULL); /* no "diff" UI options */
  25         init_revisions(&rev, prefix);
  26         rev.abbrev = 0;
  27         precompose_argv(argc, argv);
  28
  29         argc = setup_revisions(argc, argv, &rev, NULL);
  30         for (i = 1; i < argc; i++) {
  31                 const char *arg = argv[i];
  32
  33                 if (!strcmp(arg, "--cached"))
  34                         cached = 1;
  35                 else
  36                         usage(diff_cache_usage);
  37         }
  38         if (!rev.diffopt.output_format)
  39                 rev.diffopt.output_format = DIFF_FORMAT_RAW;
  40
  41         /*
  42          * Make sure there is one revision (i.e. pending object),
  43          * and there is no revision filtering parameters.
  44          */
  45         if (rev.pending.nr != 1 ||
  46             rev.max_count != -1 || rev.min_age != -1 || rev.max_age != -1)
  47                 usage(diff_cache_usage);
  48         if (!cached) {
  49                 setup_work_tree();
  50                 if (read_cache_preload(&rev.diffopt.pathspec) < 0) {
  51                         perror("read_cache_preload");
  52                         return -1;
  53                 }
  54         } else if (read_cache() < 0) {
  55                 perror("read_cache");
  56                 return -1;
  57         }
  58         result = run_diff_index(&rev, cached);
  59         return diff_result_code(&rev.diffopt, result);
  60 }