builtin/diff-index.c

   1 #define USE_THE_REPOSITORY_VARIABLE
   2 #define DISABLE_SIGN_COMPARE_WARNINGS
   3
   4 #include "builtin.h"
   5 #include "config.h"
   6 #include "diff.h"
   7 #include "diff-merges.h"
   8 #include "commit.h"
   9 #include "preload-index.h"
  10 #include "revision.h"
  11 #include "setup.h"
  12
  13 static const char diff_cache_usage[] =
  14 "git diff-index [-m] [--cached] [--merge-base] "
  15 "[<common-diff-options>] <tree-ish> [<path>...]"
  16 "\n"
  17 COMMON_DIFF_OPTIONS_HELP;
  18
  19 int cmd_diff_index(int argc,
  20                    const char **argv,
  21                    const char *prefix,
  22                    struct repository *repo UNUSED)
  23 {
  24         struct rev_info rev;
  25         unsigned int option = 0;
  26         int i;
  27         int result;
  28
  29         show_usage_if_asked(argc, argv, diff_cache_usage);
  30
  31         git_config(git_diff_basic_config, NULL); /* no "diff" UI options */
  32
  33         prepare_repo_settings(the_repository);
  34         the_repository->settings.command_requires_full_index = 0;
  35
  36         repo_init_revisions(the_repository, &rev, prefix);
  37         rev.abbrev = 0;
  38         prefix = precompose_argv_prefix(argc, argv, prefix);
  39
  40         /*
  41          * We need (some of) diff for merges options (e.g., --cc), and we need
  42          * to avoid conflict with our own meaning of "-m".
  43          */
  44         diff_merges_suppress_m_parsing();
  45
  46         argc = setup_revisions(argc, argv, &rev, NULL);
  47         for (i = 1; i < argc; i++) {
  48                 const char *arg = argv[i];
  49
  50                 if (!strcmp(arg, "--cached"))
  51                         option |= DIFF_INDEX_CACHED;
  52                 else if (!strcmp(arg, "--merge-base"))
  53                         option |= DIFF_INDEX_MERGE_BASE;
  54                 else if (!strcmp(arg, "-m"))
  55                         rev.match_missing = 1;
  56                 else
  57                         usage(diff_cache_usage);
  58         }
  59         if (!rev.diffopt.output_format)
  60                 rev.diffopt.output_format = DIFF_FORMAT_RAW;
  61
  62         rev.diffopt.rotate_to_strict = 1;
  63
  64         /*
  65          * Make sure there is one revision (i.e. pending object),
  66          * and there is no revision filtering parameters.
  67          */
  68         if (rev.pending.nr != 1 ||
  69             rev.max_count != -1 || rev.min_age != -1 || rev.max_age != -1)
  70                 usage(diff_cache_usage);
  71         if (!(option & DIFF_INDEX_CACHED)) {
  72                 setup_work_tree();
  73                 if (repo_read_index_preload(the_repository, &rev.diffopt.pathspec, 0) < 0) {
  74                         perror("repo_read_index_preload");
  75                         return -1;
  76                 }
  77         } else if (repo_read_index(the_repository) < 0) {
  78                 perror("repo_read_index");
  79                 return -1;
  80         }
  81         run_diff_index(&rev, option);
  82         result = diff_result_code(&rev);
  83         release_revisions(&rev);
  84         return result;
  85 }