midx: allow marking a pack as preferred
[git/debian.git] / builtin / diff-index.c
blobc33d7af47859cc1a42ad3c11046812e6a5dd53eb
1 #define USE_THE_INDEX_COMPATIBILITY_MACROS
2 #include "cache.h"
3 #include "config.h"
4 #include "diff.h"
5 #include "commit.h"
6 #include "revision.h"
7 #include "builtin.h"
8 #include "submodule.h"
10 static const char diff_cache_usage[] =
11 "git diff-index [-m] [--cached] "
12 "[<common-diff-options>] <tree-ish> [<path>...]"
13 COMMON_DIFF_OPTIONS_HELP;
15 int cmd_diff_index(int argc, const char **argv, const char *prefix)
17 struct rev_info rev;
18 unsigned int option = 0;
19 int i;
20 int result;
22 if (argc == 2 && !strcmp(argv[1], "-h"))
23 usage(diff_cache_usage);
25 git_config(git_diff_basic_config, NULL); /* no "diff" UI options */
26 repo_init_revisions(the_repository, &rev, prefix);
27 rev.abbrev = 0;
28 prefix = precompose_argv_prefix(argc, argv, prefix);
30 argc = setup_revisions(argc, argv, &rev, NULL);
31 for (i = 1; i < argc; i++) {
32 const char *arg = argv[i];
34 if (!strcmp(arg, "--cached"))
35 option |= DIFF_INDEX_CACHED;
36 else if (!strcmp(arg, "--merge-base"))
37 option |= DIFF_INDEX_MERGE_BASE;
38 else
39 usage(diff_cache_usage);
41 if (!rev.diffopt.output_format)
42 rev.diffopt.output_format = DIFF_FORMAT_RAW;
45 * Make sure there is one revision (i.e. pending object),
46 * and there is no revision filtering parameters.
48 if (rev.pending.nr != 1 ||
49 rev.max_count != -1 || rev.min_age != -1 || rev.max_age != -1)
50 usage(diff_cache_usage);
51 if (!(option & DIFF_INDEX_CACHED)) {
52 setup_work_tree();
53 if (read_cache_preload(&rev.diffopt.pathspec) < 0) {
54 perror("read_cache_preload");
55 return -1;
57 } else if (read_cache() < 0) {
58 perror("read_cache");
59 return -1;
61 result = run_diff_index(&rev, option);
62 UNLEAK(rev);
63 return diff_result_code(&rev.diffopt, result);