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bash completion: Resolve git show ref:path<tab> losing ref: portion
[git.git] / builtin-diff-files.c
1 /*
2  * GIT - The information manager from hell
3  *
4  * Copyright (C) Linus Torvalds, 2005
5  */
6 #include "cache.h"
7 #include "diff.h"
8 #include "commit.h"
9 #include "revision.h"
10 #include "builtin.h"
12 static const char diff_files_usage[] =
13 "git-diff-files [-q] [-0/-1/2/3 |-c|--cc] [<common diff options>] [<path>...]"
14 COMMON_DIFF_OPTIONS_HELP;
16 int cmd_diff_files(int argc, const char **argv, const char *prefix)
17 {
18         struct rev_info rev;
19         int result;
20         unsigned options = 0;
22         init_revisions(&rev, prefix);
23         git_config(git_diff_basic_config, NULL); /* no "diff" UI options */
24         rev.abbrev = 0;
26         argc = setup_revisions(argc, argv, &rev, NULL);
27         while (1 < argc && argv[1][0] == '-') {
28                 if (!strcmp(argv[1], "--base"))
29                         rev.max_count = 1;
30                 else if (!strcmp(argv[1], "--ours"))
31                         rev.max_count = 2;
32                 else if (!strcmp(argv[1], "--theirs"))
33                         rev.max_count = 3;
34                 else if (!strcmp(argv[1], "-q"))
35                         options |= DIFF_SILENT_ON_REMOVED;
36                 else
37                         usage(diff_files_usage);
38                 argv++; argc--;
39         }
40         if (!rev.diffopt.output_format)
41                 rev.diffopt.output_format = DIFF_FORMAT_RAW;
43         /*
44          * Make sure there are NO revision (i.e. pending object) parameter,
45          * rev.max_count is reasonable (0 <= n <= 3), and
46          * there is no other revision filtering parameters.
47          */
48         if (rev.pending.nr ||
49             rev.min_age != -1 || rev.max_age != -1 ||
50             3 < rev.max_count)
51                 usage(diff_files_usage);
53         if (rev.max_count == -1 &&
54             (rev.diffopt.output_format & DIFF_FORMAT_PATCH))
55                 rev.combine_merges = rev.dense_combined_merges = 1;
57         if (read_cache() < 0) {
58                 perror("read_cache");
59                 return -1;
60         }
61         result = run_diff_files(&rev, options);
62         return diff_result_code(&rev.diffopt, result);
63 }