Print directory using PostScript printer or through ghostscript.
It depends on `pr-print-using-ghostscript'.
Interactively, the command prompts for N-UP printing number, a directory, a
file name regexp for matching and, when you use a prefix argument (C-u), the
command prompts the user for a file name, and saves the PostScript image in
that file instead of saving it in a temporary file.
Noninteractively, if N-UP is nil, prompts for N-UP printing number. If DIR is
nil, prompts for DIRectory. If FILE-REGEXP is nil, prompts for
FILE(name)-REGEXP. The argument FILENAME is treated as follows: if it's nil,
save the image in a temporary file. If FILENAME is a string, save the
PostScript image in a file with that name. If FILENAME is t, prompts for a
file name.
See also documentation for `pr-list-directory'.
(fn N-UP DIR FILE-REGEXP &optional FILENAME)