pprint-newline kind &optional stream => nil
Arguments and Values:
kind---one of :linear, :fill, :miser, or :mandatory.
stream---a stream designator. The default is standard output.
If stream is a pretty printing stream and the value of *print-pretty* is true, a line break is inserted in the output when the appropriate condition below is satisfied; otherwise, pprint-newline has no effect.
Kind specifies the style of conditional newline. This parameter is treated as follows:
When a line break is inserted by any type of conditional newline, any blanks that immediately precede the conditional newline are omitted from the output and indentation is introduced at the beginning of the next line. By default, the indentation causes the following line to begin in the same horizontal position as the first character in the immediately containing logical block. (The indentation can be changed via pprint-indent.)
There are a variety of ways unconditional newlines can be introduced into the output (i.e., via terpri or by printing a string containing a newline character). As with mandatory conditional newlines, this prevents any of the containing sections from being printed on one line. In general, when an unconditional newline is encountered, it is printed out without suppression of the preceding blanks and without any indentation following it. However, if a per-line prefix has been specified (see pprint-logical-block), this prefix will always be printed no matter how a newline originates.
See Section 22.2.2 (Examples of using the Pretty Printer).
Output to stream.
*print-pretty*, *print-miser*. The presence of containing logical blocks. The placement of newlines and conditional newlines.
An error of type type-error is signaled if kind is not one of :linear, :fill, :miser, or :mandatory.
Section 126.96.36.199 (Tilde Underscore: Conditional Newline), Section 22.2.2 (Examples of using the Pretty Printer)