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