builtin/diff-index.c

   1 #define USE_THE_INDEX_COMPATIBILITY_MACROS
   2 #include "cache.h"
   3 #include "config.h"
   4 #include "diff.h"
   5 #include "commit.h"
   6 #include "revision.h"
   7 #include "builtin.h"
   8 #include "submodule.h"
   9
  10 static const char diff_cache_usage[] =
  11 "git diff-index [-m] [--cached] "
  12 "[<common-diff-options>] <tree-ish> [<path>...]"
  13 COMMON_DIFF_OPTIONS_HELP;
  14
  15 int cmd_diff_index(int argc, const char **argv, const char *prefix)
  16 {
  17         struct rev_info rev;
  18         unsigned int option = 0;
  19         int i;
  20         int result;
  21
  22         if (argc == 2 && !strcmp(argv[1], "-h"))
  23                 usage(diff_cache_usage);
  24
  25         git_config(git_diff_basic_config, NULL); /* no "diff" UI options */
  26         repo_init_revisions(the_repository, &rev, prefix);
  27         rev.abbrev = 0;
  28         precompose_argv(argc, argv);
  29
  30         argc = setup_revisions(argc, argv, &rev, NULL);
  31         for (i = 1; i < argc; i++) {
  32                 const char *arg = argv[i];
  33
  34                 if (!strcmp(arg, "--cached"))
  35                         option |= DIFF_INDEX_CACHED;
  36                 else if (!strcmp(arg, "--merge-base"))
  37                         option |= DIFF_INDEX_MERGE_BASE;
  38                 else
  39                         usage(diff_cache_usage);
  40         }
  41         if (!rev.diffopt.output_format)
  42                 rev.diffopt.output_format = DIFF_FORMAT_RAW;
  43
  44         /*
  45          * Make sure there is one revision (i.e. pending object),
  46          * and there is no revision filtering parameters.
  47          */
  48         if (rev.pending.nr != 1 ||
  49             rev.max_count != -1 || rev.min_age != -1 || rev.max_age != -1)
  50                 usage(diff_cache_usage);
  51         if (!(option & DIFF_INDEX_CACHED)) {
  52                 setup_work_tree();
  53                 if (read_cache_preload(&rev.diffopt.pathspec) < 0) {
  54                         perror("read_cache_preload");
  55                         return -1;
  56                 }
  57         } else if (read_cache() < 0) {
  58                 perror("read_cache");
  59                 return -1;
  60         }
  61         result = run_diff_index(&rev, option);
  62         UNLEAK(rev);
  63         return diff_result_code(&rev.diffopt, result);
  64 }