Function cmd_diff_files

builtin/diff-files.c:23–93

COMMON_DIFF_OPTIONS_HELP;

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

	show_usage_if_asked(argc, argv, diff_files_usage);

	repo_config(the_repository, 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