9:22 p.m.
Paul Krause <pkrause(a)ibelong.com> writes:
Getting rid of these results in more normal breakage. According to
the
new documentation for lpr-command: "On MS-DOS and MS-Windows systems, if
the value is an empty string then Emacs will write directly to the
printer port named by `printer-name'." but that doesn't seem to be what
happens.
That is because that code has incestuous connections with parts of
dos-w32.el which Andy forgot to include
;;; Support for printing under DOS/Windows, see lpr.el and ps-print.el.
(defvar direct-print-region-use-command-dot-com t
"*Control whether command.com is used to print on Windows 9x.")
;; Function to actually send data to the printer port.
;; Supports writing directly, and using various programs.
(defun direct-print-region-helper (printer
start end
lpr-prog
delete-text buf display
rest)
(let* (;; Ignore case when matching known external program names.
(case-fold-search t)
;; Convert / to \ in printer name, for sake of external programs.
(printer
(if (stringp printer)
(subst-char-in-string ?/ ?\\ printer)
printer))
;; Find a directory that is local, to work-around Windows bug.
(safe-dir
(let ((safe-dirs (list "c:/" (getenv "windir") (getenv
"TMPDIR"))))
(while (not (file-attributes (car safe-dirs)))
(setq safe-dirs (cdr safe-dirs)))
(car safe-dirs)))
(tempfile
(subst-char-in-string
?/ ?\\
(make-temp-name
(expand-file-name "EP" (getenv "TMPDIR")))))
;; capture output for diagnosis
(errbuf (list (get-buffer-create " *print-region-helper*") t)))
;; It seems that we must be careful about the directory name that
;; gets added to the printer port name by write-region when using
;; the standard "PRN" or "LPTx" ports, because the write can fail
if
;; the directory is on a network drive. The same is true when
;; asking command.com to copy the file.
;; No action is needed for UNC printer names, which is just as well
;; because `expand-file-name' doesn't support UNC names on MS-DOS.
(if (and (stringp printer) (not (string-match "^\\\\" printer)))
(setq printer
(subst-char-in-string ?/ ?\\ (expand-file-name printer safe-dir))))
;; Handle known programs specially where necessary.
(unwind-protect
(cond
;; nprint.exe is the standard print command on Netware
((string-match "^nprint\\(\\.exe\\)?$" (file-name-nondirectory lpr-prog))
(write-region start end tempfile nil 0)
(call-process lpr-prog nil errbuf nil
tempfile (concat "P=" printer)))
;; print.exe is a standard command on NT
((string-match "^print\\(\\.exe\\)?$" (file-name-nondirectory lpr-prog))
;; Be careful not to invoke print.exe on MS-DOS or Windows 9x
;; though, because it is a TSR program there (hangs Emacs).
(or (and (eq system-type 'windows-nt)
(null (getenv "winbootdir")))
(error "Printing via print.exe is not supported on MS-DOS or Windows
9x"))
;; It seems that print.exe always appends a form-feed so we
;; should make sure to omit the last FF in the data.
(if (and (> end start)
(char-equal (char-before end) ?\C-l))
(setq end (1- end)))
;; cancel out annotate function for non-PS case
(let ((write-region-annotate-functions nil))
(write-region start end tempfile nil 0))
(call-process lpr-prog nil errbuf nil
(concat "/D:" printer) tempfile))
;; support lpr and similar programs for convenience, but
;; supply an explicit filename because the NT version of lpr
;; can't read from stdin.
((> (length lpr-prog) 0)
(write-region start end tempfile nil 0)
(setq rest (append rest (list tempfile)))
(apply 'call-process lpr-prog nil errbuf nil rest))
;; Run command.com to access printer port on Windows 9x, unless
;; we are supposed to append to an existing (non-empty) file,
;; to work around a bug in Windows 9x that prevents Win32
;; programs from accessing LPT ports reliably.
((and (eq system-type 'windows-nt)
(getenv "winbootdir")
;; Allow cop-out so command.com isn't invoked
direct-print-region-use-command-dot-com
;; file-attributes fails on LPT ports on Windows 9x but
;; not on NT, so handle both cases for safety.
(eq (or (nth 7 (file-attributes printer)) 0) 0))
(write-region start end tempfile nil 0)
(let ((w32-quote-process-args nil))
(call-process "command.com" nil errbuf nil "/c"
(format "copy /b %s %s" tempfile printer))))
;; write directly to the printer port
(t
(write-region start end printer t 0)))
;; ensure we remove the tempfile if created
(if (file-exists-p tempfile)
(delete-file tempfile)))))
(defvar printer-name)
(defun direct-print-region-function (start end
&optional lpr-prog
delete-text buf display
&rest rest)
"DOS/Windows-specific function to print the region on a printer.
Writes the region to the device or file which is a value of
`printer-name' \(which see\), unless the value of `lpr-command'
indicates a specific program should be invoked."
;; DOS printers need the lines to end with CR-LF pairs, so make
;; sure it always happens that way, unless the buffer is binary.
(let* ((coding coding-system-for-write)
(coding-base
(if (null coding) 'undecided (coding-system-base coding)))
(eol-type (coding-system-eol-type coding-base))
;; Make each print-out eject the final page, but don't waste
;; paper if the file ends with a form-feed already.
(write-region-annotate-functions
(cons
(lambda (start end)
(if (not (char-equal (char-before end) ?\C-l))
`((,end . "\f"))))
write-region-annotate-functions))
(printer (or (and (boundp 'dos-printer)
(stringp (symbol-value 'dos-printer))
(symbol-value 'dos-printer))
printer-name)))
(or (eq coding-system-for-write 'no-conversion)
(setq coding-system-for-write
(aref eol-type 1))) ; force conversion to DOS EOLs
(direct-print-region-helper printer start end lpr-prog
delete-text buf display rest)))
(setq print-region-function 'direct-print-region-function)
;; Set this to nil if you have a port of the `pr' program
;; (e.g., from GNU Textutils), or if you have an `lpr'
;; program (see above) that can print page headers.
;; If `lpr-headers-switches' is non-nil (the default) and
;; `print-region-function' is set to `dos-print-region-function',
;; then requests to print page headers will be silently
;; ignored, and `print-buffer' and `print-region' produce
;; the same output as `lpr-buffer' and `lpr-region', accordingly.
(setq lpr-headers-switches "(page headers are not supported)")
(defvar ps-printer-name)
(defun direct-ps-print-region-function (start end
&optional lpr-prog
delete-text buf display
&rest rest)
"DOS/Windows-specific function to print the region on a PostScript printer.
Writes the region to the device or file which is a value of
`ps-printer-name' \(which see\), unless the value of `ps-lpr-command'
indicates a specific program should be invoked."
(let ((printer (or (and (boundp 'dos-ps-printer)
(stringp (symbol-value 'dos-ps-printer))
(symbol-value 'dos-ps-printer))
ps-printer-name)))
(direct-print-region-helper printer start end lpr-prog
delete-text buf display rest)))
(setq ps-print-region-function 'direct-ps-print-region-function)
;(setq ps-lpr-command "gs")
;(setq ps-lpr-switches '("-q" "-dNOPAUSE"
"-sDEVICE=epson" "-r240x60"
; "-sOutputFile=LPT1"))
(provide 'dos-w32)
;;; dos-w32.el ends here