builtin/diff-index.c

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