Function diff_tree_combined

combine-diff.c:1485–1638

}

void diff_tree_combined(const struct object_id *oid,
			const struct oid_array *parents,
			struct rev_info *rev)
{
	struct diff_options *opt = &rev->diffopt;
	struct diff_options diffopts;
	struct combine_diff_path *p, *paths;
	int i, num_paths, needsep, show_log_first, num_parent = parents->nr;
	int need_generic_pathscan;

	if (opt->ignore_regex_nr)
		die("combined diff and '%s' cannot be used together",
		    "--ignore-matching-lines");
	if (opt->close_file)
		die("combined diff and '%s' cannot be used together",
		    "--output");

	/* nothing to do, if no parents */
	if (!num_parent)
		return;

	show_log_first = !!rev->loginfo && !rev->no_commit_id;
	needsep = 0;
	if (show_log_first) {
		show_log(rev);

		if (rev->verbose_header && opt->output_format &&
		    opt->output_format != DIFF_FORMAT_NO_OUTPUT &&
		    !commit_format_is_empty(rev->commit_format))
			printf("%s%c", diff_line_prefix(opt),
			       opt->line_termination);
	}

	diffopts = *opt;
	copy_pathspec(&diffopts.pathspec, &opt->pathspec);
	diffopts.flags.allow_external = 0;
	if (!opt->flags.no_recursive_diff_tree_combined)
		diffopts.flags.recursive = 1;

	/* find set of paths that everybody touches
	 *
	 * NOTE
	 *
	 * Diffcore transformations are bound to diff_filespec and logic
	 * comparing two entries - i.e. they do not apply directly to combine
	 * diff.
	 *
	 * If some of such transformations is requested - we launch generic
	 * path scanning, which works significantly slower compared to
	 * simultaneous all-trees-in-one-go scan in find_paths_multitree().
	 *
	 * TODO some of the filters could be ported to work on
	 * combine_diff_paths - i.e. all functionality that skips paths, so in
	 * theory, we could end up having only multitree path scanning.
	 *
	 * NOTE please keep this semantically in sync with diffcore_std()
	 */
	need_generic_pathscan = opt->skip_stat_unmatch	||