gpg-interface: prefer check_signature() for GPG verification
[git] / builtin / diff-files.c
1 /*
2  * GIT - The information manager from hell
3  *
4  * Copyright (C) Linus Torvalds, 2005
5  */
6 #define USE_THE_INDEX_COMPATIBILITY_MACROS
7 #include "cache.h"
8 #include "config.h"
9 #include "diff.h"
10 #include "commit.h"
11 #include "revision.h"
12 #include "builtin.h"
13 #include "submodule.h"
14
15 static const char diff_files_usage[] =
16 "git diff-files [-q] [-0 | -1 | -2 | -3 | -c | --cc] [<common-diff-options>] [<path>...]"
17 COMMON_DIFF_OPTIONS_HELP;
18
19 int cmd_diff_files(int argc, const char **argv, const char *prefix)
20 {
21         struct rev_info rev;
22         int result;
23         unsigned options = 0;
24
25         if (argc == 2 && !strcmp(argv[1], "-h"))
26                 usage(diff_files_usage);
27
28         git_config(git_diff_basic_config, NULL); /* no "diff" UI options */
29         repo_init_revisions(the_repository, &rev, prefix);
30         rev.abbrev = 0;
31         precompose_argv(argc, argv);
32
33         argc = setup_revisions(argc, argv, &rev, NULL);
34         while (1 < argc && argv[1][0] == '-') {
35                 if (!strcmp(argv[1], "--base"))
36                         rev.max_count = 1;
37                 else if (!strcmp(argv[1], "--ours"))
38                         rev.max_count = 2;
39                 else if (!strcmp(argv[1], "--theirs"))
40                         rev.max_count = 3;
41                 else if (!strcmp(argv[1], "-q"))
42                         options |= DIFF_SILENT_ON_REMOVED;
43                 else
44                         usage(diff_files_usage);
45                 argv++; argc--;
46         }
47         if (!rev.diffopt.output_format)
48                 rev.diffopt.output_format = DIFF_FORMAT_RAW;
49
50         /*
51          * Make sure there are NO revision (i.e. pending object) parameter,
52          * rev.max_count is reasonable (0 <= n <= 3), and
53          * there is no other revision filtering parameters.
54          */
55         if (rev.pending.nr ||
56             rev.min_age != -1 || rev.max_age != -1 ||
57             3 < rev.max_count)
58                 usage(diff_files_usage);
59
60         /*
61          * "diff-files --base -p" should not combine merges because it
62          * was not asked to.  "diff-files -c -p" should not densify
63          * (the user should ask with "diff-files --cc" explicitly).
64          */
65         if (rev.max_count == -1 && !rev.combine_merges &&
66             (rev.diffopt.output_format & DIFF_FORMAT_PATCH))
67                 rev.combine_merges = rev.dense_combined_merges = 1;
68
69         if (read_cache_preload(&rev.diffopt.pathspec) < 0) {
70                 perror("read_cache_preload");
71                 return -1;
72         }
73         result = run_diff_files(&rev, options);
74         return diff_result_code(&rev.diffopt, result);
75 }