#| -*-Scheme-*-

Copyright (C) 1986, 1987, 1988, 1989, 1990, 1991, 1992, 1993, 1994,
    1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005,
    2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013, 2014, 2015, 2016,
    2017, 2018, 2019, 2020 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.

|#

;;;; 6.001: Edwin Extensions

(declare (usual-integrations))

(define student-root-directory)
(define student-work-directory)
(define pset-directory)
(define pset-list-file)
(define command-line-student-directory #f)

(set-command-line-parser! "student"
  (lambda (command-line)
    (let ((name (cadr command-line)))
      (if (file-directory? name)
	  (set! command-line-student-directory (->pathname name)))
      (values (cddr command-line) #F))))

(set! standard-editor-initialization
      (let ((usual standard-editor-initialization))
	(lambda ()
	  (usual)
	  (standard-login-initialization))))

(define (standard-login-initialization)
  (set! student-root-directory
	(if (and command-line-student-directory
		 (file-directory? command-line-student-directory))
	    (pathname-as-directory command-line-student-directory)
	    (let ((6001-dir
		   (get-environment-variable "MITSCHEME_6001_DIRECTORY")))
	      (if (and 6001-dir (file-directory? 6001-dir))
		  (pathname-as-directory 6001-dir)
		  "~u6001/"))))
  (set! student-work-directory
	(merge-pathnames "work/" student-root-directory))
  (if (not (file-directory? student-root-directory))
      (set! student-root-directory (user-homedir-pathname)))
  (if (not (file-directory? student-work-directory))
      (set! student-work-directory (user-homedir-pathname)))
  (set! pset-directory (merge-pathnames "psets/" student-root-directory))
  (set! pset-list-file (merge-pathnames "probsets.scm" pset-directory))
  (set-default-directory student-work-directory)
  (set-working-directory-pathname! student-work-directory)
  (let ((hairy-floppy-stuff?
	 (and (eq? 'UNIX microcode-id/operating-system)
	      (string-ci=? "HP-UX" microcode-id/operating-system-variant))))
    (if hairy-floppy-stuff?
	(run-floppy-login-loop))
    (let ((pathname (merge-pathnames "motd" student-root-directory)))
      (if (file-exists? pathname)
	  (let ((buffer (temporary-buffer "*motd*")))
	    (call-with-current-continuation
	     (lambda (k)
	       (bind-condition-handler (list condition-type:file-error)
		   (lambda (condition)
		     condition
		     (kill-buffer buffer)
		     (k unspecific))
		 (lambda ()
		   (%insert-file (buffer-start buffer) pathname #f)))
	       (set-buffer-point! buffer (buffer-start buffer))
	       (select-buffer buffer))))))
    (if hairy-floppy-stuff?
	(message "Login completed."))))

(define-command logout
  "Logout from the 6.001 Scheme system."
  ()
  (lambda ()
    (fluid-let ((paranoid-exit? #f))
      ((ref-command save-buffers-kill-scheme) #f))))

(define (restore-focus-to-editor)
  (let ((name (graphics-type-name (graphics-type #f))))
    (case name
      ((X)
       (let ((screen (selected-screen)))
	 (if (xterm-screen/grab-focus! screen)
	     (xterm-screen/flush! screen))))
      ((WIN32)
       ((access set-focus (->environment '(win32)))
	((access get-handle (->environment '(win32))) 1)))
      (else
       (error "Unsupported graphics type:" name)))))

(link-variables '(student pictures) 'restore-focus-to-editor
		'(edwin) 'restore-focus-to-editor)

(if (eq? 'UNIX microcode-id/operating-system)
    (load-edwin-library 'PRINT))

(define-command print-graphics
  "Print out window with graphics."
  '()
  (lambda ()
    (let ((window (prompt-for-expression-value "Window to print" 'mouse)))
      (if (eq? window 'mouse)
	  (print-pointed-x-window)
	  (if (graphics-device? window)
	      (print-given-x-window (x-graphics/window-id window))
	      (editor-error "Not a window object!"))))))

(define (print-given-x-window x-window-id)
  ((message-wrapper #f "Spooling")
   (lambda ()
     (shell-command
      #f #f #f #f
      (string-append (->namestring
		      (merge-pathnames "bin/print-given-x-window"
				       student-root-directory))
		     " 0x"
		     (number->string x-window-id 16)
		     " "
		     (print/assemble-switches "Scheme Picture" '()))))))

(define (print-pointed-x-window)
  ((message-wrapper #f "Click desired window")
   (lambda ()
     (shell-command
      #f #f #f #f
      (string-append (->namestring
		      (merge-pathnames "bin/print-pointed-x-window"
				       student-root-directory))
		     " "
		     (print/assemble-switches "Scheme Picture" '()))))))
#|
;;; If using pointer (mouse).

xwd | /usr/local/pbmbin/xwdtopnm | /usr/local/pbmbin/ppmtopgm | /usr/local/pbmbin/pnmscale 4 | /usr/local/pbmbin/pgmtopbm -cluster4 | /usr/local/pbmbin/pbmtolj -resolution 300 | lpr -h

;;; If using *** = x-graphics/window-id

xwd -id *** | /usr/local/pbmbin/xwdtopnm | /usr/local/pbmbin/ppmtopgm | /usr/local/pbmbin/pnmscale 4 | /usr/local/pbmbin/pgmtopbm -cluster4 | /usr/local/pbmbin/pbmtolj -resolution 300 | lpr -h

Now, there is formatting stuff to be considered here, in print-pgm.sh.
|#

;;;; EDWIN Command "Load Problem Set"

;;; Wired-in pathnames

;;; The structure "problem-sets" must be loaded from pset-list-file whenever
;;; the set of available problem sets changes, or when the default
;;; problem set changes.  Files should appear with name and extension, but
;;; without device, directory, or version; these will be supplied
;;; automatically.
;;;
;;; Example problem-sets variable:

;(define problem-sets
;  `(1 (1  (load&reference "ps1-c-curve.scm" "ps1-debug.scm"))
;      (2  (copy "ps2-ans.scm") (load&reference "ps2-primes.scm"))
;      (3  (copy "ps3-ans.scm")
;	  (load&reference "ps3-squares.scm" "ps3-tri.scm"))
;      (4  (copy "ps4-ans.scm") (load&reference "ps4-doctor.scm")
;	  (select "ps4-ans.scm"))
;      (5  (copy "ps5-ans.scm")
;	  (load&reference "ps5-graph.scm" "ps5-imp.scm" "ps5-res.scm"))
;      (6  (copy "ps6-mods.scm") (load&reference "ps6-adv.scm"))
;      (7  (copy "ps7-ans.scm")
;	  (load&reference "ps7-ps.scm" "ps7-psutil.scm" "ps7-ratnum.scm"))
;      (8  (copy "ps8-mods.scm") (load&reference "ps8-mceval.scm"))))

;;; Data abstraction for the "problem-sets" object:

(define problem-sets/default-ps car)
(define problem-sets/psets cdr)
(define psets/first-pset car)
(define psets/rest-psets cdr)
(define psets/empty? null?)
(define pset/ps car)
(define pset/groups cdr)
(define (groups/files-to-copy groups)
  (let ((any (assq 'copy groups)))
    (if any (cdr any) '())))
(define (groups/files-to-load groups)
  (let ((any (assq 'load groups)))
    (if any (cdr any) '())))
(define (groups/files-to-reference groups)
  (let ((any (assq 'reference groups)))
    (if any (cdr any) '())))
(define (groups/files-to-load&reference groups)
  (let ((any (assq 'load&reference groups)))
    (if any (cdr any) '())))
(define (groups/buffer-to-select groups)
  (let ((any (assq 'select groups)))
    (if any (cadr any) '())))
(define (groups/all-files groups)
  (merge-lists (groups/files-to-copy groups)
	       (groups/files-to-load groups)
	       (groups/files-to-reference groups)
	       (groups/files-to-load&reference groups)))

;;; Procedure to get the "files" object corresponding to a particular
;;; problem set.  Runs error-handler (which should never return) if
;;; the problem set number is not listed in the "problem-sets" object.

(define (ps-groups ps error-handler)
  (let loop ((remaining-psets (problem-sets/psets problem-sets)))
    (if (psets/empty? remaining-psets)
	(error-handler)
	(let ((first-ps (psets/first-pset remaining-psets)))
	  (if (string=? ps (->string (pset/ps first-ps)))
	      (pset/groups first-ps)
	      (loop (psets/rest-psets remaining-psets)))))))

;;; Horribly inefficient procedure to merge lists, ensuring that no member
;;; is repeated in the resulting list.
(define (merge-lists . lists)
  (let ((one-list (apply append lists)))
    (let loop ((remaining one-list)
	       (accumulated '()))
      (if (null? remaining)
	  accumulated
	  (let ((first (car remaining))
		(rest (cdr remaining)))
	    (if (memq first rest)
		(loop rest accumulated)
		(loop rest (cons first accumulated))))))))

;;; Returns #t iff FILES all exist in DIRECTORY.
(define (files-all-exist? files directory)
  (every (lambda (file)
	   (file-exists? (merge-pathnames directory file)))
	 files))

(define-command load-problem-set
  "Load a 6.001 problem set."
  ()
  (lambda ()
    (load-quietly pset-list-file '(EDWIN))
    (let* ((ps
	    (prompt-for-string "Load Problem Set"
			       (->string
				(problem-sets/default-ps problem-sets))))
	   (error-handler
	    (lambda ()
	      (editor-error "There doesn't appear to be a problem set "
			    ps
			    " installed; ask a TA for help.")))
	   (groups (ps-groups ps error-handler))
	   (pset-path
	    (merge-pathnames (string-append "ps" ps "/") pset-directory)))
      (if (not (files-all-exist? (groups/all-files groups) pset-path))
	  (error-handler))
      (for-each (lambda (file)
		  (find-file-noselect (merge-pathnames file pset-path) #t))
		(groups/files-to-reference groups))
      (for-each (lambda (file)
		  (let ((filename (merge-pathnames file pset-path)))
		    ((message-wrapper #f
				      "Evaluating file "
				      (->namestring filename))
		     (lambda ()
		       (load-quietly filename '(STUDENT))))))
		(groups/files-to-load groups))
      (for-each (lambda (file)
		  (let ((filename (merge-pathnames file pset-path)))
		    ((message-wrapper #f
				      "Evaluating file "
				      (->namestring filename))
		     (lambda ()
		       (load-quietly filename '(STUDENT))))
		    (find-file-noselect filename #t)))
		(groups/files-to-load&reference groups))
      (for-each (lambda (file)
		  (load-ps-copy-file file pset-path student-work-directory))
		(groups/files-to-copy groups)))))

(define (load-quietly pathname environment)
  (parameterize ((param:suppress-loading-message? #t))
    (load pathname environment)))

(define (->string object)
  (if (string? object)
      object
      (call-with-output-string
	(lambda (port)
	  (display object port)))))

(define (load-ps-copy-file file source-dir dest-dir)
  (let ((source-file (merge-pathnames file source-dir))
	(dest-file (merge-pathnames file dest-dir))
	(filename (->namestring file)))
    (if (file-exists? dest-file)
	(let* ((backup-pathname (pathname-new-type file "bak"))
	       (backup-filename (->namestring backup-pathname)))
	  (with-saved-configuration
	   (lambda ()
	     (delete-other-windows (current-window))
	     (let ((buffer (temporary-buffer " *load-problem-set-dialog*")))
	       (select-buffer buffer)
	       (append-string
		"This problem set contains a file named ")
	       (append-string
		(write-to-string filename))
	       (append-string ",
but your working directory already contains a file of that name.

Answer \"yes\" to replace your file with the file from the problem set.
If you choose this option your file will be renamed \"")
	       (append-string backup-filename)
	       (append-string "\".

Otherwise answer \"no\" to leave your file unchanged; if you choose this
option the file from the problem set will not be installed.
"))
	     (if (prompt-for-yes-or-no? "Install problem set file")
		 (begin
		   (append-string
		    (string-append "\nRenaming \""
				   filename
				   "\" to \""
				   backup-filename
				   "\"..."))
		   (rename-ps-file dest-file backup-pathname)
		   (append-string
		    (string-append "done\n\nCopying file \""
				   filename
				   "\" to working area..."))
		   (copy-ps-file source-file dest-file)
		   (append-string "done"))
		 (begin
		   (append-string "\nOK, not using problem set file.")
		   (find-file-noselect dest-file #t))))))
	(let ((msg
	       (string-append "Copying file \""
			      filename
			      "\" to working area...")))
	  (message msg)
	  (copy-ps-file source-file dest-file)
	  (message msg "done")))))

(define (rename-ps-file from-file to-file)
  (call-with-current-continuation
   (lambda (k)
     (bind-condition-handler (list condition-type:file-error
				   condition-type:port-error)
	 (lambda (condition)
	   condition
	   (k unspecific))
       (lambda ()
	 (delete-file to-file)))))
  (bind-condition-handler (list condition-type:file-error
				condition-type:port-error)
      (lambda (condition)
	(editor-error "Rename failed: "
		      (condition/report-string condition)))
    (lambda ()
      (rename-file from-file to-file))))

(define (copy-ps-file from-file to-file)
  (let ((buffer (find-file-noselect from-file #t)))
    (set-buffer-writeable! buffer)
    (set-visited-pathname buffer to-file)
    (write-buffer buffer)))

;;;; Customization

(set! default-homedir-pathname (lambda () student-work-directory))

(set! editor-can-exit? #f)
(set! scheme-can-suspend? #f)
(set! paranoid-exit? #t)

(set-variable! enable-transcript-buffer #t)
(set-variable! evaluate-in-inferior-repl #t)
(set-variable! repl-error-decision #t)
(set-variable! version-control #t)
(set-variable! trim-versions-without-asking #t)

#|
;; No longer needed.
(if (eq? 'UNIX microcode-id/operating-system)
    (set-variable!
     mail-header-function
     (let ((default-reply-to #f))
       (lambda (point)
	 (let ((reply-to
		(prompt-for-string "Please enter an email address for replies"
				   default-reply-to
				   'DEFAULT-TYPE 'INSERTED-DEFAULT)))
	   (if (not (string-null? reply-to))
	       (begin
		 (set! default-reply-to reply-to)
		 (insert-string "From: " point)
		 (insert-string reply-to point)
		 (insert-newline point)
		 (insert-string "Reply-to: " point)
		 (insert-string reply-to point)
		 (insert-newline point))))))))
|#

(set-variable! select-buffer-not-found-hooks
	       (cons (lambda (name)
		       (find-file-noselect
			(merge-pathnames name student-work-directory)
			#t))
		     (ref-variable select-buffer-not-found-hooks)))