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 "config.h"
   8#include "diff.h"
   9#include "commit.h"
  10#include "revision.h"
  11#include "builtin.h"
  12#include "submodule.h"
  13
  14static const char diff_files_usage[] =
  15"git diff-files [-q] [-0 | -1 | -2 | -3 | -c | --cc] [<common-diff-options>] [<path>...]"
  16COMMON_DIFF_OPTIONS_HELP;
  17
  18int cmd_diff_files(int argc, const char **argv, const char *prefix)
  19{
  20        struct rev_info rev;
  21        int result;
  22        unsigned options = 0;
  23
  24        if (argc == 2 && !strcmp(argv[1], "-h"))
  25                usage(diff_files_usage);
  26
  27        git_config(git_diff_basic_config, NULL); /* no "diff" UI options */
  28        init_revisions(&rev, prefix);
  29        gitmodules_config();
  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}