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