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