/*

 * GIT - The information manager from hell

 *

 * Copyright (C) Linus Torvalds, 2005

 */

#include "builtin.h"

#include "config.h"

#include "diff.h"

#include "diff-merges.h"

#include "commit.h"

#include "preload-index.h"

#include "repository.h"

#include "revision.h"

static const char diff_files_usage[] =

"git diff-files [-q] [-0 | -1 | -2 | -3 | -c | --cc] [<common-diff-options>] [<path>...]"

"\n"

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;

  if (argc == 2 && !strcmp(argv[1], "-h"))

    usage(diff_files_usage);

  git_config(git_diff_basic_config, NULL); /* no "diff" UI options */

  prepare_repo_settings(the_repository);

  the_repository->settings.command_requires_full_index = 0;

  repo_init_revisions(the_repository, &rev, prefix);

  rev.abbrev = 0;

  /*

   * Consider "intent-to-add" files as new by default, unless

   * explicitly specified in the command line or anywhere else.

   */

  rev.diffopt.ita_invisible_in_index = 1;

  prefix = precompose_argv_prefix(argc, argv, prefix);

  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;

  rev.diffopt.rotate_to_strict = 1;

  /*

   * 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.diffopt.output_format & DIFF_FORMAT_PATCH))

    diff_merges_set_dense_combined_if_unset(&rev);

  if (repo_read_index_preload(the_repository, &rev.diffopt.pathspec, 0) < 0)

    die_errno("repo_read_index_preload");

  run_diff_files(&rev, options);

  result = diff_result_code(&rev.diffopt);

  release_revisions(&rev);

  return result;

}