Add cache preload facility
[git/git.git] / builtin-diff-files.c
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8bc9a0c7
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1/*
2 * GIT - The information manager from hell
3 *
4 * Copyright (C) Linus Torvalds, 2005
5 */
e83c5163 6#include "cache.h"
4a6bf9e1 7#include "diff.h"
91539833
LT
8#include "commit.h"
9#include "revision.h"
e8cc9cd9 10#include "builtin.h"
c0fb976a 11
4d1f1190 12static const char diff_files_usage[] =
1b1dd23f 13"git diff-files [-q] [-0/-1/2/3 |-c|--cc] [<common diff options>] [<path>...]"
dda2d79a 14COMMON_DIFF_OPTIONS_HELP;
b8f80925 15
a633fca0 16int cmd_diff_files(int argc, const char **argv, const char *prefix)
e83c5163 17{
6973dcae 18 struct rev_info rev;
41bbf9d5 19 int result;
6304c29d 20 unsigned options = 0;
e83c5163 21
a633fca0 22 init_revisions(&rev, prefix);
ef90d6d4 23 git_config(git_diff_basic_config, NULL); /* no "diff" UI options */
6973dcae
JH
24 rev.abbrev = 0;
25
6304c29d
JH
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 }
c9b5ef99
TH
40 if (!rev.diffopt.output_format)
41 rev.diffopt.output_format = DIFF_FORMAT_RAW;
6304c29d
JH
42
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);
52
903e09a3
JH
53 /*
54 * "diff-files --base -p" should not combine merges because it
55 * was not asked to. "diff-files -c -p" should not densify
56 * (the user should ask with "diff-files --cc" explicitly).
57 */
58 if (rev.max_count == -1 && !rev.combine_merges &&
6304c29d
JH
59 (rev.diffopt.output_format & DIFF_FORMAT_PATCH))
60 rev.combine_merges = rev.dense_combined_merges = 1;
61
671c9b7e
LT
62 if (read_cache_preload(rev.diffopt.paths) < 0) {
63 perror("read_cache_preload");
6304c29d
JH
64 return -1;
65 }
66 result = run_diff_files(&rev, options);
da31b358 67 return diff_result_code(&rev.diffopt, result);
e83c5163 68}