root/builtin/diff-files.c

DEFINITIONS

1. cmd_diff_files

/*
 * GIT - The information manager from hell
 *
 * Copyright (C) Linus Torvalds, 2005
 */
#include "cache.h"
#include "diff.h"
#include "commit.h"
#include "revision.h"
#include "builtin.h"
#include "submodule.h"

static const char diff_files_usage[] =
"git diff-files [-q] [-0 | -1 | -2 | -3 | -c | --cc] [<common-diff-options>] [<path>...]"
COMMON_DIFF_OPTIONS_HELP;

int cmd_diff_files(int argc, const char **argv, const char *prefix)
{
        struct rev_info rev;
        int result;
        unsigned options = 0;

        init_revisions(&rev, prefix);
        gitmodules_config();
        git_config(git_diff_basic_config, NULL); /* no "diff" UI options */
        rev.abbrev = 0;

        argc = setup_revisions(argc, argv, &rev, NULL);
        while (1 < argc && argv[1][0] == '-') {
                if (!strcmp(argv[1], "--base"))
                        rev.max_count = 1;
                else if (!strcmp(argv[1], "--ours"))
                        rev.max_count = 2;
                else if (!strcmp(argv[1], "--theirs"))
                        rev.max_count = 3;
                else if (!strcmp(argv[1], "-q"))
                        options |= DIFF_SILENT_ON_REMOVED;
                else
                        usage(diff_files_usage);
                argv++; argc--;
        }
        if (!rev.diffopt.output_format)
                rev.diffopt.output_format = DIFF_FORMAT_RAW;

        /*
         * Make sure there are NO revision (i.e. pending object) parameter,
         * rev.max_count is reasonable (0 <= n <= 3), and
         * there is no other revision filtering parameters.
         */
        if (rev.pending.nr ||
            rev.min_age != -1 || rev.max_age != -1 ||
            3 < rev.max_count)
                usage(diff_files_usage);

        /*
         * "diff-files --base -p" should not combine merges because it
         * was not asked to.  "diff-files -c -p" should not densify
         * (the user should ask with "diff-files --cc" explicitly).
         */
        if (rev.max_count == -1 && !rev.combine_merges &&
            (rev.diffopt.output_format & DIFF_FORMAT_PATCH))
                rev.combine_merges = rev.dense_combined_merges = 1;

        if (read_cache_preload(&rev.diffopt.pathspec) < 0) {
                perror("read_cache_preload");
                return -1;
        }
        result = run_diff_files(&rev, options);
        return diff_result_code(&rev.diffopt, result);
}