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;;;;;
;;;;; $Id$
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;;;;; Copyright (C) 1991, 1996  Lysator Academic Computer Association.
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;;;;;
;;;;; This file is part of the LysKOM server.
;;;;; 
;;;;; LysKOM is free software; you can redistribute it and/or modify it
;;;;; under the terms of the GNU General Public License as published by 
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;;;;; the Free Software Foundation; either version 2, or (at your option) 
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;;;;; any later version.
;;;;; 
;;;;; LysKOM 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 LysKOM; see the file COPYING.  If not, write to
;;;;; Lysator, c/o ISY, Linkoping University, S-581 83 Linkoping, SWEDEN,
;;;;; or the Free Software Foundation, Inc., 675 Mass Ave, Cambridge, 
;;;;; MA 02139, USA.
;;;;;
;;;;; Please mail bug reports to bug-lyskom@lysator.liu.se. 
;;;;;
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;;;; ================================================================
;;;; ================================================================
;;;;
;;;; File: flags.el
;;;;
;;;; This file contains code for editing the user variables and saving
;;;; them in the user area.
;;;;

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(setq lyskom-clientversion-long 
      (concat lyskom-clientversion-long
	      "$Id$\n"))


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;;; Author: Linus Tolke

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;;; Dummy defun of original-user-variable-p to eliminate compiler warning.

(defun original-user-variable-p (x) nil)
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(fset 'original-user-variable-p
      (symbol-function 'user-variable-p))


(defun lyskom-user-variable-p (symbol)
  (and (original-user-variable-p symbol)
       (or (string-match "^kom-"
			 (symbol-name symbol))
	   (string-match "^lyskom-"
			 (symbol-name symbol)))))

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(defun lyskom-Edit-options-modify (modfun)
  (save-excursion
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   (let ((inhibit-read-only t)
	 var pos tmp)
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     (re-search-backward "^;; \\|\\`")
     (forward-char 3)
     (setq pos (point))
     (save-restriction
       (narrow-to-region pos (progn (end-of-line) (1- (point))))
       (goto-char pos)
       (setq var (read (current-buffer))))
     (goto-char pos)
     (forward-line 1)
     (forward-char 1)
     (save-excursion
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       (set var (setq tmp (funcall modfun var)))
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       (if (boundp 'lyskom-buffer)
           (set-buffer lyskom-buffer))
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       (set var tmp))
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     (kill-sexp 1)
     (prin1 (symbol-value var) (current-buffer)))))
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(defvar lyskom-options-text nil
  "Text mass when reading options.")

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(def-kom-command kom-save-options ()
  "Save options that have been set somewhere."
  (interactive)
  (lyskom-save-options (or lyskom-buffer 
                           (current-buffer))
                       (lyskom-get-string 'saving-settings)
                       (lyskom-get-string 'saving-settings-done)
                       (lyskom-get-string 'could-not-save-options)))

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(defun kom-edit-options ()
  "Edit options for the lyskom client."
  (interactive)
  (fset 'user-variable-p
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	(symbol-function 'lyskom-user-variable-p))  
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  (let ((buf (current-buffer))
	(curwin (current-window-configuration)))
    (edit-options)
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    (fset 'Edit-options-modify
          (symbol-function 'lyskom-Edit-options-modify))
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    (make-local-variable 'lyskom-buffer)
    (make-local-variable 'lyskom-edit-return-to-configuration)
    (setq lyskom-buffer buf)
    (setq lyskom-edit-return-to-configuration curwin)
    (local-set-key "\C-c\C-c" 'kom-edit-options-send)
    (local-set-key "\C-c\C-k" 'kom-edit-quit)
    )
  (fset 'user-variable-p
	(symbol-function 'original-user-variable-p)))

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;;;============================================================
;;;  kom-edit-options-send
;;;
;;;  Finish an edit options session.
;;;  This function must be kept in sync with lyskom-save-options
;;;  below.
;;;
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(defun kom-edit-options-send ()
  "Finishes the edit options and sends the new settings to the server."
  (interactive)
  ; The check for changes is not a very good one.
  (cond
   ((not (eq major-mode 'Edit-options-mode))
    (error "You are not in the correct buffer. (Couldn't fool me this time."))
   ((buffer-modified-p (current-buffer))
    ;lets do it.
    ;lyskom-global-variables is a list of variables in the common block.
    ;lyskom-elisp-variables is a list of varibles in the elisp block.
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    (let* ((buf lyskom-buffer)
           (optbuf (current-buffer))
           (print-readably t)
           (common-block 
            (concat
             (mapconcat (function
                         (lambda (var)
                           (lyskom-format-objects
                            (substring (symbol-name var) 4) 
                            (if (symbol-value var) "1" "0"))))
                        lyskom-global-boolean-variables
                        "\n")
             "\n"
             (mapconcat (function
                         (lambda (var)
                           (lyskom-format-objects
                            (substring (symbol-name var) 4) 
                            (prin1-to-string (symbol-value var)))))
                        lyskom-global-non-boolean-variables
                        "\n")
             ))
           (elisp-block
            (mapconcat (function
                        (lambda (var)
                          (lyskom-format-objects (symbol-name var) 
                                                 (prin1-to-string
                                                  (symbol-value var)))))
                       lyskom-elisp-variables
                       "\n")))
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      (set-buffer buf)
      (lyskom-start-of-command (lyskom-get-string 'saving-settings) t)
      (lyskom-insert-string 'hang-on)
      (initiate-create-text 'options 'lyskom-edit-options-send
			    ;;; This is a cludge awaiting prot-B
			    (apply 'lyskom-format-objects 
				   (apply 'lyskom-format-objects 
					  "common"
					  "elisp"
					  (mapcar 
					   (function car)
					   lyskom-other-clients-user-areas))
				   common-block
				   elisp-block
				   (mapcar (function cdr) 
					   lyskom-other-clients-user-areas))
;			    (concat common-block "----------\n" elisp-block)
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			    (lyskom-create-misc-list) optbuf)))
   (t
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    (let ((optbuf (current-buffer)))
      (set-buffer lyskom-buffer)
      (lyskom-start-of-command (lyskom-get-string 'saving-settings) t)
      (lyskom-insert-string 'no-changes)
      (lyskom-edit-options-done t optbuf)))))
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(defun lyskom-edit-options-send (text-no optbuf)
  "Handles the call after the options text has been sent to the buffer."
  (if text-no
      (initiate-set-user-area 'options 'lyskom-edit-options-done
			      lyskom-pers-no text-no optbuf)
    (lyskom-insert-string 'could-not-create-area)
    (lyskom-end-of-command)))


(defun lyskom-edit-options-done (success optbuf)
  "Handles the return from the set user area call.
If successful then set the buffer not-modified. Else print a warning."
  (if success
      (save-excursion
	;;;+++ This should be done with the asynchronous call instead.
	(cache-del-pers-stat lyskom-pers-no)
	(set-buffer optbuf)
	(not-modified)
	(set-window-configuration lyskom-edit-return-to-configuration))
    (lyskom-format-insert 'could-not-set-user-area lyskom-errno))
  (lyskom-end-of-command))


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(def-kom-var lyskom-options-done nil
  "When we have read all options this is turned non-nil."
  local)
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;;;============================================================
;;;  lyskom-save-options
;;;
;;;  Save user-area without feedback in the KOM buffer. This
;;;  is for use by all functions but edit-options.
;;;
;;;  Messages are given in the minibuffer

(defun lyskom-save-options (kombuf start-message done-message error-message)
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  (let* ((print-readably t)
         (common-block 
          (concat
           (mapconcat (function
                       (lambda (var)
                         (lyskom-format-objects
                          (substring (symbol-name var) 4) 
                          (if (symbol-value var) "1" "0"))))
                      lyskom-global-boolean-variables
                      "\n")
           "\n"
           (mapconcat (function
                       (lambda (var)
                         (lyskom-format-objects
                          (substring (symbol-name var) 4) 
                          (prin1-to-string (symbol-value var)))))
                      lyskom-global-non-boolean-variables
                      "\n")
           ))
         (elisp-block
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          (mapconcat (function
                      (lambda (var)
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                        (lyskom-format-objects (symbol-name var) 
                                               (prin1-to-string
                                                (symbol-value var)))))
                     lyskom-elisp-variables
                     "\n")))
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    (save-excursion
      (set-buffer kombuf)
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      (lyskom-message "%s" start-message)
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      (initiate-create-text 'options 'lyskom-save-options-2
                            (apply 'lyskom-format-objects
                                   (apply 'lyskom-format-objects
                                          "common"
                                          "elisp"
                                          (mapcar 
                                           (function car)
                                           lyskom-other-clients-user-areas))
                                   common-block
                                   elisp-block
                                   (mapcar (function cdr)
                                           lyskom-other-clients-user-areas))
                            (lyskom-create-misc-list) 
                            kombuf
                            done-message
                            error-message))))

(defun lyskom-save-options-2 (text-no kombuf done-message error-message)
  (if text-no
      (initiate-set-user-area 'options 'lyskom-save-options-3
                              lyskom-pers-no text-no kombuf 
                              done-message error-message)
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    (save-excursion
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     (set-buffer kombuf)
     (lyskom-insert-string 'could-not-save-options)
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     (lyskom-message "%s" (lyskom-get-string 'could-not-save-options)))))
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(defun lyskom-save-options-3 (success kombuf done-message error-message)
  (save-excursion
    (set-buffer kombuf)
    (if success
        (progn
          (cache-del-pers-stat lyskom-pers-no)
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          (lyskom-message "%s" done-message))
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      (lyskom-format-insert 'could-not-set-user-area lyskom-errno)
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      (lyskom-message "%s" error-message))))
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(defun lyskom-read-options ()
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  "Reads the user-area and sets the variables according to the choises."
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  (if (and lyskom-pers-no
	   (not (zerop lyskom-pers-no)))
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      (let ((pers-stat (blocking-do 'get-pers-stat lyskom-pers-no)))
	(if (not pers-stat)  ;+++ Other error handler.
	    (lyskom-insert-string 'you-dont-exist)
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	  (setq lyskom-other-clients-user-areas nil)
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	  (if (zerop (pers-stat->user-area pers-stat))
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	      (progn
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		;; (lyskom-tell-phrases-validate)
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		(setq lyskom-options-done t))
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	    (lyskom-read-options-eval 
	     (blocking-do 'get-text
			  (pers-stat->user-area pers-stat))))))))
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(defun lyskom-read-options-eval (text)
  "Handles the call from where we have the text."
  (if text				;+++ Other error handler
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      (let* ((lyskom-options-text (text->text-mass text))
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	     (pointers (lyskom-read-options-eval-get-holerith))
	     common-no elisp-no
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	     (rest lyskom-options-text)
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	     working
	     (r 1))
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	(let* ((lyskom-options-text pointers)
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	       word
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	       (r 1))
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	  (while (> (length lyskom-options-text) 2)
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	    (setq word (lyskom-read-options-eval-get-holerith))
	    (cond
	     ((string= word "common")
	      (setq common-no r))
	     ((string= word "elisp")
	      (setq elisp-no r))
	     (t
	      (setq lyskom-other-clients-user-areas
		    (cons (cons word r) lyskom-other-clients-user-areas))))
	    (++ r)))
	(setq lyskom-other-clients-user-areas 
	      (nreverse lyskom-other-clients-user-areas))
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	(setq lyskom-options-text rest)
	(while (> (length lyskom-options-text) 2)
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	  (setq working (lyskom-read-options-eval-get-holerith))
	  (cond
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	   ;; Note that common-no may be nil here, so the comparison
	   ;; cannot be performed with '=.
	   ((equal r common-no)
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	    (let ((lyskom-options-text working)
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		  name gname value)
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	      (while (> (length lyskom-options-text) 2)
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		(setq gname (lyskom-read-options-eval-get-holerith))
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		(setq value (lyskom-read-options-eval-get-holerith))
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		(setq name (concat "kom-" gname))
		(if (memq (intern-soft name) lyskom-global-boolean-variables)
		    (if (string= value "1")
			(setq value "t")
		      (setq value "nil"))
		  (if (memq (intern-soft name) 
			    lyskom-global-non-boolean-variables)
		      nil
		    (setq name (concat "UNK-" gname))
		    (setq lyskom-global-non-boolean-variables
			  (cons name lyskom-global-non-boolean-variables))))
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		(lyskom-maybe-set-var-from-string name value))))
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	   ;; Note that elisp-no may be nil here, so the comparison
	   ;; cannot be performed with '=.
	   ((equal r elisp-no)
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	    (let ((lyskom-options-text working)
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		  name value)
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	      (while (> (length lyskom-options-text) 2)
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		(setq name (lyskom-read-options-eval-get-holerith))
		(setq value (lyskom-read-options-eval-get-holerith))
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		(lyskom-maybe-set-var-from-string name value))))
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	   (t
	    (let ((pos lyskom-other-clients-user-areas))
	      (while (and pos
			  (not (= (cdr (car pos)) r)))
		(setq pos (cdr pos)))
	      (if pos
		  (setcdr (car pos) working)))))
	  (++ r))

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	(setq lyskom-filter-list (append kom-permanent-filter-list
					 kom-session-filter-list))
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	(setq lyskom-do-when-done (cons kom-do-when-done kom-do-when-done))
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	;; Remove not found user-areas
	(let ((pos lyskom-other-clients-user-areas))
	  (if pos
	      (progn
		(while (stringp (cdr (car (cdr pos))))
		  (setq pos (cdr pos)))
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		(setcdr pos nil))))))
  (setq lyskom-options-done t))
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(defun lyskom-read-options-eval-get-holerith ()
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  (while (string-match "\\s-" (substring lyskom-options-text 0 1))
    (setq lyskom-options-text (substring lyskom-options-text 1)))
  (let ((len (string-to-int lyskom-options-text))
	(start (progn (string-match "[0-9]+H" lyskom-options-text)
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		      (match-end 0))))
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    (let ((name (substring lyskom-options-text start (+ start len))))
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      (setq lyskom-options-text (substring lyskom-options-text
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                                           (+ start len)))
      name)))
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(defun lyskom-maybe-set-var-from-string (var string)
  "This is a wrapper around lyskom-set-var-from-string that does nothing
if the variable is in kom-dont-read-saved-variables."
  (cond ((eq kom-dont-read-saved-variables t) nil)
        ((memq (intern var) kom-dont-read-saved-variables) nil)
        (t (lyskom-set-var-from-string var string))))

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(defun lyskom-set-var-from-string (var string)
  "This is a wrapper aroud read-from-string.
It returns nil, and writes a message when an error occurs."
  (set (intern var)
       (car
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	(condition-case nil
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	    (read-from-string string)
	  (invalid-read-syntax
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	   (lyskom-format-insert (lyskom-get-string 'error-in-options)
				 var string)
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	   nil)))))