Function diff_flush_patch

diff.c:6537–6563

}

static void diff_flush_patch(struct diff_filepair *p, struct diff_options *o)
{
	int include_conflict_headers =
	    (additional_headers(o, p->one->path) &&
	     !o->pickaxe_opts &&
	     (!o->filter || filter_bit_tst(DIFF_STATUS_UNMERGED, o)));

	/*
	 * Check if we can return early without showing a diff.  Note that
	 * diff_filepair only stores {oid, path, mode, is_valid}
	 * information for each path, and thus diff_unmodified_pair() only
	 * considers those bits of info.  However, we do not want pairs
	 * created by create_filepairs_for_header_only_notifications()
	 * (which always look like unmodified pairs) to be ignored, so
	 * return early if both p is unmodified AND we don't want to
	 * include_conflict_headers.
	 */
	if (diff_unmodified_pair(p) && !include_conflict_headers)
		return;

	/* Actually, we can also return early to avoid showing tree diffs */
	if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
	    (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
		return;

	run_diff(p, o);
}

/* return 1 if any change is found; otherwise, return 0 */
static int diff_flush_patch_quietly(struct diff_filepair *p, struct diff_options *o)