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
  28        argc = setup_revisions(argc, argv, &rev, NULL);
  29        while (1 < argc && argv[1][0] == '-') {
  30                if (!strcmp(argv[1], "--base"))
  31                        rev.max_count = 1;
  32                else if (!strcmp(argv[1], "--ours"))
  33                        rev.max_count = 2;
  34                else if (!strcmp(argv[1], "--theirs"))
  35                        rev.max_count = 3;
  36                else if (!strcmp(argv[1], "-q"))
  37                        options |= DIFF_SILENT_ON_REMOVED;
  38                else
  39                        usage(diff_files_usage);
  40                argv++; argc--;
  41        }
  42        if (!rev.diffopt.output_format)
  43                rev.diffopt.output_format = DIFF_FORMAT_RAW;
  44
  45        /*
  46         * Make sure there are NO revision (i.e. pending object) parameter,
  47         * rev.max_count is reasonable (0 <= n <= 3), and
  48         * there is no other revision filtering parameters.
  49         */
  50        if (rev.pending.nr ||
  51            rev.min_age != -1 || rev.max_age != -1 ||
  52            3 < rev.max_count)
  53                usage(diff_files_usage);
  54
  55        /*
  56         * "diff-files --base -p" should not combine merges because it
  57         * was not asked to.  "diff-files -c -p" should not densify
  58         * (the user should ask with "diff-files --cc" explicitly).
  59         */
  60        if (rev.max_count == -1 && !rev.combine_merges &&
  61            (rev.diffopt.output_format & DIFF_FORMAT_PATCH))
  62                rev.combine_merges = rev.dense_combined_merges = 1;
  63
  64        if (read_cache_preload(&rev.diffopt.pathspec) < 0) {
  65                perror("read_cache_preload");
  66                return -1;
  67        }
  68        result = run_diff_files(&rev, options);
  69        return diff_result_code(&rev.diffopt, result);
  70}