builtin/diff-index.c

   1 #include "builtin.h"
   2 #include "config.h"
   3 #include "diff.h"
   4 #include "diff-merges.h"
   5 #include "commit.h"
   6 #include "preload-index.h"
   7 #include "repository.h"
   8 #include "revision.h"
   9 #include "setup.h"
  10
  11 static const char diff_cache_usage[] =
  12 "git diff-index [-m] [--cached] [--merge-base] "
  13 "[<common-diff-options>] <tree-ish> [<path>...]"
  14 "\n"
  15 COMMON_DIFF_OPTIONS_HELP;
  16
  17 int cmd_diff_index(int argc, const char **argv, const char *prefix)
  18 {
  19         struct rev_info rev;
  20         unsigned int option = 0;
  21         int i;
  22         int result;
  23
  24         if (argc == 2 && !strcmp(argv[1], "-h"))
  25                 usage(diff_cache_usage);
  26
  27         git_config(git_diff_basic_config, NULL); /* no "diff" UI options */
  28
  29         prepare_repo_settings(the_repository);
  30         the_repository->settings.command_requires_full_index = 0;
  31
  32         repo_init_revisions(the_repository, &rev, prefix);
  33         rev.abbrev = 0;
  34         prefix = precompose_argv_prefix(argc, argv, prefix);
  35
  36         /*
  37          * We need (some of) diff for merges options (e.g., --cc), and we need
  38          * to avoid conflict with our own meaning of "-m".
  39          */
  40         diff_merges_suppress_m_parsing();
  41
  42         argc = setup_revisions(argc, argv, &rev, NULL);
  43         for (i = 1; i < argc; i++) {
  44                 const char *arg = argv[i];
  45
  46                 if (!strcmp(arg, "--cached"))
  47                         option |= DIFF_INDEX_CACHED;
  48                 else if (!strcmp(arg, "--merge-base"))
  49                         option |= DIFF_INDEX_MERGE_BASE;
  50                 else if (!strcmp(arg, "-m"))
  51                         rev.match_missing = 1;
  52                 else
  53                         usage(diff_cache_usage);
  54         }
  55         if (!rev.diffopt.output_format)
  56                 rev.diffopt.output_format = DIFF_FORMAT_RAW;
  57
  58         rev.diffopt.rotate_to_strict = 1;
  59
  60         /*
  61          * Make sure there is one revision (i.e. pending object),
  62          * and there is no revision filtering parameters.
  63          */
  64         if (rev.pending.nr != 1 ||
  65             rev.max_count != -1 || rev.min_age != -1 || rev.max_age != -1)
  66                 usage(diff_cache_usage);
  67         if (!(option & DIFF_INDEX_CACHED)) {
  68                 setup_work_tree();
  69                 if (repo_read_index_preload(the_repository, &rev.diffopt.pathspec, 0) < 0) {
  70                         perror("repo_read_index_preload");
  71                         return -1;
  72                 }
  73         } else if (repo_read_index(the_repository) < 0) {
  74                 perror("repo_read_index");
  75                 return -1;
  76         }
  77         run_diff_index(&rev, option);
  78         result = diff_result_code(&rev);
  79         release_revisions(&rev);
  80         return result;
  81 }