#| -*-Scheme-*-

$Id: print.scm,v 1.25 2007/01/05 21:19:24 cph Exp $

Copyright (C) 1986, 1987, 1988, 1989, 1990, 1991, 1992, 1993, 1994,
    1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005,
    2006, 2007 Massachusetts Institute of Technology

This file is part of MIT/GNU Scheme.

MIT/GNU Scheme is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or (at
your option) any later version.

MIT/GNU Scheme is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
General Public License for more details.

You should have received a copy of the GNU General Public License
along with MIT/GNU Scheme; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301,
USA.

|#

;;;; Print Buffers and Regions

(declare (usual-integrations))

(define-command lpr-buffer
  "Print buffer contents as with Unix command `lpr'.
Variable LPR-SWITCHES is a list of extra switches (strings) to pass to lpr."
  '()
  (lambda ()
    (print-region/internal (buffer-region (current-buffer)) false)))

(define-command print-buffer
  "Print buffer contents as with Unix command `lpr -p'.
Variable LPR-SWITCHES is a list of extra switches (strings) to pass to lpr."
  '()
  (lambda ()
    (print-region/internal (buffer-region (current-buffer)) true)))

(define-command lpr-region
  "Print region contents as with Unix command `lpr'.
Variable LPR-SWITCHES is a list of extra switches (strings) to pass to lpr."
  "r"
  (lambda  (region)
    (print-region/internal region false)))

(define-command print-region
  "Print region contents as with Unix command `lpr -p'.
Variable LPR-SWITCHES is a list of extra switches (strings) to pass to lpr."
  "r"
  (lambda  (region)
    (print-region/internal region true)))

(define (print-region/internal region print-headers?)
  ((message-wrapper #f "Spooling")
   (lambda ()
     (let ((buffer (mark-buffer (region-start region)))
	   (print-headers? (and print-headers? (not lpr-print-not-special?)))
	   (title (print-region-title-string region)))
       (let ((call-printer
	      (lambda (region)
		((or (ref-variable lpr-procedure buffer)
		     (case microcode-id/operating-system
		       ((NT) print-region/nt)
		       (else print-region/default)))
		 region print-headers? title buffer)))
	     (width (ref-variable tab-width buffer)))
	 (if (= width 8)
	     (call-printer region)
	     (call-with-temporary-buffer " *spool temp*"
	       (lambda (temp-buffer)
		 (insert-region (region-start region)
				(region-end region)
				(buffer-point temp-buffer))
		 (define-variable-local-value! temp-buffer
		   (ref-variable-object tab-width)
		   width)
		 (untabify-region (buffer-start temp-buffer)
				  (buffer-end temp-buffer))
		 (call-printer (buffer-region temp-buffer))))))))))

(define (print-region/default region print-headers? title buffer)
  (shell-command region false false false
		 (string-append
		  (ref-variable lpr-command buffer)
		  (print/assemble-switches title
					   (if print-headers? '("-p") '())))))

(define (print-region/nt region print-headers? title buffer)
  print-headers? title buffer
  (call-with-temporary-file-pathname
   (lambda (pathname)
     (call-with-temporary-buffer " print"
       (lambda (temp)
	 (insert-region (region-start region)
			(region-end region)
			(buffer-end temp))
	 (insert-char #\page (buffer-end temp))
	 (write-region (buffer-region temp) pathname #f #t)))
     (shell-command #f #f #f #f
		    (string-append "copy "
				   (->namestring pathname)
				   " prn")))))

(define (print-region-title-string region)
  (let ((buffer-title
	 (let ((buffer (mark-buffer (region-start region))))
	   (and buffer
		(or (let ((pathname (buffer-pathname buffer)))
		      (and pathname
			   (not (directory-pathname? pathname))
			   (file-namestring pathname)))
		    (string-append "Edwin buffer " (buffer-name buffer)))))))
    (if (or (not buffer-title)
	    (and (group-start? (region-start region))
		 (group-end? (region-end region))))
	buffer-title
	(string-append "region from " buffer-title))))

(define (print/assemble-switches title additional-switches)
  (apply string-append
	 (let loop
	     ((switches
	       (let ((switches (ref-variable lpr-switches)))
		 (append additional-switches
			 (let ((job-name (or (print/job-name) title)))
			   (if job-name
			       (list (string-append "-J \"" job-name "\""))
			       '()))
			 (if (and title
				  (not (there-exists? switches
					 (lambda (switch)
					   (string-prefix? "-T" switch)))))
			     (list (string-append "-T \"" title "\""))
			     '())
			 switches))))
	   (if (null? switches)
	       (list "")
	       (cons* " "
		      (car switches)
		      (loop (cdr switches)))))))

(define print/job-name
  (let ((most-recent-name false))
    (lambda ()
      (and lpr-prompt-for-name?
	   (let ((job-name
		  (prompt-for-string "Name to print on title page"
				     most-recent-name
				     'DEFAULT-TYPE 'INSERTED-DEFAULT)))
	     (if (string-null? job-name)
		 false
		 (begin
		   (set! most-recent-name job-name)
		   job-name)))))))