lyskom-rest.el 84 KB
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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: lyskom-rest.el
;;;;
;;;; This is the rest of what was once the entire source code of the
;;;; client. Now most of the source resides in other files. Eventually
;;;; the functions in here will be distributed out to other files.
;;;; Below follows the original header of the LysKOM elisp client:
;;;;
;;;; ================================================================
;;;;
;;;; Simple LysKOM elisp client.
;;;;
;;;; Originally written by Per Cederqvist.
;;;;
;;;; Heavily hacked by:
;;;;    Thomas Bellman
;;;;    Linus Tolke
;;;;    Inge Wallin
;;;;   and others.
;;;;
;;;; Some ideas stolen from lpmud.el written by Lars Willf|r and Thomas Bellman
;;;;
;;;; Conventions:
;;;;
;;;;    All functions, variables etc follow one of these conventions:
;;;;		lyskom-		general functions.
;;;;		cache-		cache-routines.
;;;;		initiate-	call a service. (Might look up in cache)
;;;;		kom-		user kommands.
;;;;		lyskom-parse-	parse (part of) a reply from the server.
;;;;				these are found in parse.el
;;;;		lyskom-edit-	Things related to the editing of texts.
;;;;		{lyskom,kom}-edit-options-
;;;;				things related to editing options
;;;;				(found in flags.el)
;;;;		{lyskom,kom}-prioritize-
;;;;				things related to the prioritize
;;;;				buffer. The file is prioritize.el
;;;;		{lyskom,kom}-{completing-read,completing,complete}-
;;;;				things related to
;;;;				lyskom-completing-read. Found in
;;;;				completing-read.el 
;;;;		lyskom-*-hook   hooks.
;;;;
;;;;    Three plus-signs (+++) in the code marks a place where more
;;;;    work is needed.
;;;;

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


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;;;; ================================================================
;;;;                             New errors.


(put 'lyskom-protocol-error 'error-conditions
     '(error lyskom-error lyskom-protocol-error))
(put 'lyskom-protocol-error 'error-message
     "LysKOM protocol error:")

(put 'lyskom-internal-error 'error-conditions
     '(error lyskom-error lyskom-internal-error))
(put 'lyskom-internal-error 'error-message
     "Internal LysKOM error.")

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(put 'lyskom-format-error 'error-conditions
     '(error lyskom-error lyskom-format-error))
(put 'lyskom-internal-error 'error-message
     "Internal LysKOM format error.")

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;;; ================================================================
;;;             Global variables
;;;

(defvar lyskom-unread-mode-line nil)

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;;; ================================================================
;;;             Error reporting from a number of commands.
;;;

;;; Author: Inge Wallin



(defun lyskom-get-error-text (errno)
  "Get a string which is the error ERRNO in plain text."
  (let ((pair (assoc errno lyskom-error-texts)))
    (if pair 
	(cdr pair)
      (lyskom-format 'error-not-found errno))))

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(defun lyskom-report-command-answer (answer)
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  "Handles a void return from call to the server."
  (if answer 
      (lyskom-insert-string 'done)
    (lyskom-insert-string 'nope)
    (lyskom-format-insert 'error-code
			  (lyskom-get-error-text lyskom-errno)
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			  lyskom-errno)))
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;;; ----------------------------------------------------------------
;;; Author: Aronsson

(defun lyskom-tell-string (key)
  "Retrieve the phrase indexed by the key from the kom-tell-phrases
assoc list."
  (car (cdr (assoc key kom-tell-phrases))))


(defun lyskom-tell-internat (key)
  "Same as lyskom-tell-server, but use a key to a list of phrases."
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  ;; The server at Lysator produces a lot of network traffic. The
  ;; solution should to be less verbose. This is very interesting
  ;; anymore, anyway.
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  (lyskom-tell-server (lyskom-tell-string key)))



;;;; ================================================================
;;;;                User-level commands and functions.


(defun lyskom-command-name (command)
  "Get the command name for the command COMMAND"
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  (car (cdr (assoc command 
		   (if kom-emacs-knows-iso-8859-1
		       lyskom-commands
		     lyskom-swascii-commands)))))
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(defun lyskom-ok-command (alternative administrator)
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  "Returns non-nil if it is ok to do such a command right now."
  (if administrator
      (not (memq (car (cdr alternative)) lyskom-admin-removed-commands))
    (not (memq (car (cdr alternative)) lyskom-noadmin-removed-commands))))


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(defun kom-extended-command ()
  "Read a LysKOM function name and call the function."
  (interactive)
  (let* ((completion-ignore-case t)
	 (alternatives (mapcar (function reverse)
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			       (if kom-emacs-knows-iso-8859-1
				   lyskom-commands
				 lyskom-swascii-commands)))
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	 (name (completing-read (lyskom-get-string 'extended-command)
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				alternatives 
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				;; lyskom-is-administrator is buffer-local and
				;; must be evalled before the call to 
				;; completing-read
				;; Yes, this is not beautiful
				(list 'lambda '(alternative)
				      (list 'lyskom-ok-command 'alternative
					    lyskom-is-administrator))
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				t nil))
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	 (fnc (reverse-assoc (car (all-completions name alternatives)) 
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			     (if kom-emacs-knows-iso-8859-1
				 lyskom-commands
			       lyskom-swascii-commands))))
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    (cond
     (fnc (call-interactively (car fnc)))
     (t (kom-next-command)))))


;;; Resume operation after a crash.

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(defun kom-recover (&optional refetch)
  "Try to recover from an error.
If the optional argument REFETCH is non-nil, `lyskom-refetch' is called."
  (interactive "p")
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  (lyskom-init-parse lyskom-buffer)
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  (setq lyskom-call-data nil)
  (setq lyskom-pending-calls nil)
  (setq lyskom-output-queue (lyskom-queue-create))
  (setq lyskom-number-of-pending-calls 0)
  (setq lyskom-is-parsing nil)
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  (if refetch (lyskom-refetch))
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  (lyskom-tell-internat 'kom-tell-recover)
  (lyskom-end-of-command))


;;; ================================================================
;;;                      Run default command.


;;; Author: Tommy Persson

(defun kom-page-next-command ()
  "Scroll the bottom to the top and run the next command if it should be run"
  (interactive)
  (if (pos-visible-in-window-p (point-max))
      (progn
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	(goto-char (point-max))
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	(recenter 0)
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	(lyskom-next-command))
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    (recenter 0)
    (move-to-window-line -1)
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    (lyskom-set-last-viewed)))
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;;; Author: Lars Willf|r
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(defun kom-next-command ()
  "Run next command or scroll one page."
  (interactive)
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  (if (pos-visible-in-window-p (point-max))
      (lyskom-next-command)
    (move-to-window-line -1)
    (lyskom-set-last-viewed)
    (lyskom-scroll)))
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(defun kom-line-next-command ()
  "Run next command or scroll one line."
  (interactive)
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  (if (pos-visible-in-window-p (point-max))
      (lyskom-next-command)
    (move-to-window-line 1)
    (lyskom-set-last-viewed)
    (lyskom-scroll)))
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;;; Author: Per Cederqvist

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(defun lyskom-next-command ()
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  "Run next command."
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  (let ((lyskom-doing-default-command t))
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    (cond
     ((eq lyskom-command-to-do 'next-pri-text)
      (lyskom-view-priority-text))
     ((eq lyskom-command-to-do 'next-text)
      (kom-view-next-text))
     ((eq lyskom-command-to-do 'next-conf)
      (kom-go-to-next-conf))
     ((eq lyskom-command-to-do 'next-pri-conf)
      (lyskom-go-to-pri-conf))
     ((eq lyskom-command-to-do 'when-done)
      (let ((command (lyskom-what-to-do-when-done)))
	(cond
	 ((stringp command)
	  (execute-kbd-macro command))
	 (t (call-interactively command)))))
     ((eq lyskom-command-to-do 'unknown)
      (lyskom-insert
       (lyskom-get-string 'wait-for-server)))
     (t (signal 'lyskom-internal-error '(kom-next-command))))))
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;;; ================================================================
;;;                              View text.


(defun kom-initial-digit-view ()
  (interactive)
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  (setq unread-command-events (cons last-command-event
                                    unread-command-events))
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  (call-interactively 'kom-view nil))


(defun kom-view (text-no)
  "View text number TEXT-NO."
  (interactive "P")
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  (unwind-protect
      (progn
	(let ((kom-page-before-command nil))
	  (lyskom-start-of-command 'kom-view)
	  (lyskom-tell-internat 'kom-tell-review)
	  )
	(if (setq text-no (cond ((null text-no) nil)
				((listp text-no) (car text-no))
				(t text-no)))
	    nil
	  (setq text-no (lyskom-read-number (lyskom-get-string 'review-text-q)
					    lyskom-current-text)))
	(if (or (not (listp kom-page-before-command))
		(memq 'kom-view kom-page-before-command))
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	    (recenter 1))
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	(lyskom-tell-internat 'kom-tell-review)
	(lyskom-format-insert 'review-text-no text-no)
	(lyskom-view-text text-no))
    (lyskom-end-of-command)))
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;;;; ================================================================
;;;;                         View next text.


(defun kom-view-next-new-text ()
  "Display next new text (putting all review constructs at the end of this conf)."
  (interactive)
  (let ((len (read-list-length lyskom-reading-list))
	(finished nil))
    (while (and (not finished)
		(> len 1))
      (let ((type (read-info->type (read-list->first lyskom-reading-list))))
	(cond 
	 ((or (eq type 'REVIEW)
	      (eq type 'REVIEW-TREE)
	      (eq type 'REVIEW-MARK))
	  (read-list-rotate lyskom-reading-list))
	 ((or (eq type 'COMM-IN)
	      (eq type 'FOOTN-IN))
	  (set-read-list-del-first lyskom-reading-list))
	 (t 
	  (setq finished t))))
      (-- len)))
  (kom-view-next-text))


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;;; Modified to handle filters

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(def-kom-command kom-view-next-text ()
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  "Display next text (from lyskom-reading-list)."
  (interactive)
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  (lyskom-tell-internat 'kom-tell-read)
  (let ((action 'next-text))
    (while (eq action 'next-text)
      (if (read-list-isempty lyskom-reading-list)
	  (progn
	    (if (/= 0 lyskom-current-conf)
		(lyskom-insert-string 'completely-read-conf)
	      (lyskom-insert-string 'not-in-any-conf))
	    (setq action nil))
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	(progn
	  (let* ((tri (read-list->first lyskom-reading-list))
		 (text-no (car (cdr (read-info->text-list tri))))
		 (type (read-info->type tri))
		 (priority (read-info->priority
			    (read-list->first lyskom-reading-list)))
		 (is-review-tree (eq type 'REVIEW-TREE))
		 (is-review (or (eq type 'REVIEW)
				(eq type 'REVIEW-MARK)
				is-review-tree))
		 (mark-as-read (not is-review)))
	    (if is-review
		(delq text-no 
		      (read-info->text-list tri))) ;First entry only
	    (setq action
		  (lyskom-view-text text-no mark-as-read 
				    (and kom-read-depth-first
					 (not is-review))
				    (read-info->conf-stat
				     (read-list->first
				      lyskom-reading-list))
				    priority
				    is-review-tree
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				    (not is-review)))
	    (if mark-as-read
		(lyskom-is-read text-no)
	      (read-list-delete-text nil lyskom-reading-list)
	      (read-list-delete-text nil lyskom-to-do-list))))))))
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;;; Modified to handle filters
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;; This is horribly ugly. It acts like a user command, but it isn't.
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(defun lyskom-view-priority-text ()
  "Display the first text from the next conference on the lyskom-to-do-list."
  (lyskom-start-of-command 'kom-view-next-text)
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  (unwind-protect
      (progn
	(lyskom-tell-internat 'kom-tell-read)
	(let* ((tri (read-list->first lyskom-to-do-list))
	       (priority (read-info->priority
			  (read-list->first lyskom-reading-list)))
	       (text-no (car (text-list->texts (read-info->text-list tri)))))
	  (lyskom-is-read text-no)
	  (lyskom-view-text text-no t nil (read-info->conf-stat tri) 
			    priority nil t))
	(lyskom-wait-queue 'main))
    (lyskom-end-of-command)))
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(defun lyskom-is-read (text-no)
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  "Remove TEXT-NO from the list of texts to read.
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Deletes TEXT-NO from lyskom-reading-list and lyskom-to-do-list.
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Adds info in lyskom-membership.

This function only modifies the internal state of the client. It does
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not mark the text as read in the server. That function is performed by
lyskom-mark-as-read."
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  (read-list-delete-text text-no lyskom-reading-list)
  (read-list-delete-text text-no lyskom-to-do-list)
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  (initiate-get-text-stat 'main 'lyskom-is-read-handler text-no)
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  (setq lyskom-normally-read-texts (cons text-no lyskom-normally-read-texts)))
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(defun lyskom-is-read-handler (text-stat)
  "Update lyskom-membership for all recipients to TEXT-STAT."
  (lyskom-traverse
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      misc (text-stat->misc-info-list text-stat)
    (if (or (eq 'RECPT (misc-info->type misc))
	    (eq 'CC-RECPT (misc-info->type misc)))
	(let ((membership (lyskom-member-p (misc-info->recipient-no misc))))
	  (if membership
	      (set-membership->read-texts
	       membership
	       (vconcat (vector (misc-info->local-no misc))
			(membership->read-texts membership))))))))
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;;; ================================================================
;;;                        Go to next conf.


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(def-kom-command kom-go-to-next-conf ()
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  "Go to next conf.
Take first conf from lyskom-to-do-list and copy it to lyskom-reading-list.
Tell server what the user is doing. If the user is reading a conf it is
moved last on lyskom-to-do-list, with priority 0."
  (interactive)
  (lyskom-maybe-move-unread t)
  (lyskom-go-to-next-conf))


(defun lyskom-go-to-pri-conf ()
  "Go to the conf with higher priority.
This differs from kom-go-to-next-conf only in the place where the yet unread 
in the current conf is placed."
  (lyskom-start-of-command 'kom-go-to-next-conf)
  (lyskom-maybe-move-unread nil)
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  (lyskom-go-to-next-conf)
  (lyskom-end-of-command))
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(defun lyskom-go-to-next-conf ()
  "Actually go to the next conference on the lyskom-to-do-list"
  ;; Copy first element on lyskom-to-do-list to lyskom-reading-list.
  (if (not (read-list-isempty lyskom-to-do-list))
      (progn
	(read-list-enter-first
	   (read-list->first lyskom-to-do-list)
	   lyskom-reading-list)

	;; Tell server which conf the user is reading.
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	(let ((conf-stat (read-info->conf-stat
			  (read-list->first lyskom-reading-list))))
	  (when conf-stat
	    (lyskom-enter-conf
	     conf-stat 
	     (read-list->first lyskom-reading-list))
	    (lyskom-set-mode-line conf-stat))))
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    (lyskom-insert-string 'all-conf-unread-r)
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    (lyskom-set-mode-line (lyskom-get-string 'all-conf-unread-s))))
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(defun lyskom-maybe-move-unread (bury)
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  "Empty the reading list.
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If the argument BURY is non-nil and there are unread artilces left in the
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reading list then the conf is inserted last in the to do list."
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  (if (not (read-list-isempty lyskom-reading-list))
      (progn
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	(if bury
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	    (let ((conf-no nil)
		  (r 0))
	      (while (and (not conf-no)
			  (< r (read-list-length lyskom-reading-list)))
		(if (eq (read-info->type (read-list->nth lyskom-reading-list 
							 r))
			'CONF)
		    (setq conf-no (conf-stat->conf-no 
				   (read-info->conf-stat
				    (read-list->nth lyskom-reading-list r))))
		  (++ r)))
	      (if conf-no
		  (progn
		    (read-list-delete-read-info conf-no lyskom-to-do-list)
		    (read-list-enter-first (read-list->nth lyskom-reading-list
							   r)
					   lyskom-to-do-list)
		    (read-list-rotate lyskom-to-do-list)))))
	(set-read-list-empty lyskom-reading-list))))


(defun lyskom-enter-conf (conf-stat read-info)
  "Tell server which conf the user is reading.
Prints the name and amount of unread in the conference we just went to 
according to the value of kom-print-number-of-unread-on-entrance.
Args: CONF-STAT READ-INFO"
  (initiate-pepsi 'main nil (conf-stat->conf-no conf-stat))
  (setq lyskom-current-conf (conf-stat->conf-no conf-stat))
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  (let ((num-unread (length (text-list->texts
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			     (read-info->text-list
			      read-info)))))
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    (lyskom-format-insert (if (not kom-print-number-of-unread-on-entrance)
			      'enter-conf
			    (if (= num-unread 1)
				'one-unread
			      'several-unread))
			  conf-stat
			  num-unread)))
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;;;================================================================

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;;; in vars.el:
;(defvar lyskom-sessions-with-unread nil
;  "Global variable. List of lyskom-sessions with unread articles.")
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;;;Must be called after lyskom-get-string is defined. Also after running 
;;;load hooks.
;;;(or (assq 'lyskom-sessions-with-unread minor-mode-alist)
;;;    (setq minor-mode-alist (cons (list 'lyskom-sessions-with-unread 
;;;			       		  (lyskom-get-string 'mode-line-unread))
;;;				 minor-mode-alist)))

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(defun lyskom-set-mode-line (&optional conf)
  "Sets mode-line-conf-name to the name of the optional argument conf CONF.
CONF can be a a conf-stat or a string."
  (let ((name (cond
	       ((null conf) 
		(if (zerop lyskom-current-conf)
		    (lyskom-get-string 'not-present-anywhere)
		  (initiate-get-conf-stat 'modeline 'lyskom-set-mode-line
					  lyskom-current-conf)
		  nil))
	       ((stringp conf) conf)
	       ((lyskom-conf-stat-p conf)
		(conf-stat->name conf))
	       (t "")))
	(unread -1)
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	(total-unread 0)
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	(letters 0)
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	(len 0)
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	(read-info-list nil))

    (if (null name)
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	nil				; We didn't have the name.

      ;; Set unread to the number of unread texts in CONF.
      (if (lyskom-conf-stat-p conf)
	  (progn
	    (setq read-info-list 
		  (read-list->all-entries lyskom-to-do-list))

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	    ;; This was weird. Someone had begun to write an if, but
	    ;; this was all there was: (if 
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	    (while read-info-list
	      (if (read-info->conf-stat (car read-info-list))
		  (progn
		    (setq len (length (text-list->texts 
				       (read-info->text-list 
					(car read-info-list)))))
		    (if (= (conf-stat->conf-no conf)
			   (conf-stat->conf-no 
			    (read-info->conf-stat (car read-info-list))))
			(setq unread len))
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		    (if (= lyskom-pers-no
			   (conf-stat->conf-no 
			    (read-info->conf-stat (car read-info-list))))
			(setq letters len))
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		    (setq total-unread (+ total-unread len))))
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	      (setq read-info-list (cdr read-info-list)))))
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      (if (= unread -1)
	  (setq unread 0))
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      (if (null name)
	  nil
	(setq mode-line-conf-name 
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	      (substring (concat
			  (if (lyskom-conf-stat-p conf)
			      (if (> lyskom-session-priority 0)
				  (format "(%d/%d:%d) "
					  unread total-unread
					  lyskom-session-priority)
				(format "(%d/%d) " unread total-unread))
			    "")
			  name
			  (make-string 27 ? ))
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			 0 27))
	(if (not kom-emacs-knows-iso-8859-1)
	    (setq mode-line-conf-name
		  (iso-8859-1-to-swascii mode-line-conf-name))))
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      (if (zerop total-unread)
	  (setq lyskom-sessions-with-unread
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		(delq lyskom-buffer lyskom-sessions-with-unread))
	(or (memq lyskom-buffer lyskom-sessions-with-unread)
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	    (setq lyskom-sessions-with-unread
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		  (cons lyskom-buffer lyskom-sessions-with-unread))))
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      (if (zerop letters)
	  (setq lyskom-sessions-with-unread-letters
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		(delq lyskom-buffer lyskom-sessions-with-unread-letters))
	(or (memq lyskom-buffer lyskom-sessions-with-unread-letters)
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	    (setq lyskom-sessions-with-unread-letters
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		  (cons lyskom-buffer lyskom-sessions-with-unread-letters)))))
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    (force-mode-line-update)))
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;;; ================================================================

;;; +++Where should this be moved???


(defun lyskom-member-p (conf-no)
  "Returns non-nil if conference CONF-NO is present on lyskom-membership.
The value is actually the membership for the conference."
  (let ((list lyskom-membership)
	(found nil))
    (while (and (not found) (not (null list)))
      (if (= conf-no (membership->conf-no (car list)))
	  (setq found (car list)))
      (setq list (cdr list)))
    found))


;;;; ================================================================
;;;;                   Scrolling and text insertion.


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(defun lyskom-trim-buffer ()
  "Trim the size of a lyskom buffer to lyskom-max-buffer-size"
  (save-excursion
    (if (and kom-max-buffer-size
	     (> (buffer-size) kom-max-buffer-size))
	(let ((delchars (- (buffer-size) kom-max-buffer-size)))
	  (goto-char (point-min))
	  (while (< (point) delchars)
	    (forward-line 1))
	  (delete-region (point-min) (point))))))

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(defun lyskom-scroll ()
  "Scroll screen if necessary.
The position lyskom-last-viewed will always remain visible."
  ;; Find a window to scroll. Scroll the selected window if that shows LysKOM.
  ;; Otherwise scroll any window currently showing LysKOM.
  (let ((win
	 (cond
	  ((eq (window-buffer (selected-window)) (current-buffer))
	   (selected-window))
	  (t				;(get-buffer-window (current-buffer))
	   nil))))
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    (if (and win			;Do nothing if no window showed LysKOM.
	     (not (pos-visible-in-window-p (point-max))))
	(progn
	  (goto-char (point-max))
	  (recenter -1)
	  (if (not (pos-visible-in-window-p lyskom-last-viewed))
	      (progn
		(set-window-start win lyskom-last-viewed)
		(move-to-window-line -1)
		(vertical-motion 1)
		(if (not (pos-visible-in-window-p))
		    (forward-char -1))))))))
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(defun lyskom-insert (string)
  "Insert STRING last in current buffer.
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Leaves the point at the end of the buffer if possible without
scrolling past lyskom-last-viewed (generally the most recent prompt.)
Leaves the point at the end of the window if not possible. If buffer
is not on screen then doesn't move point.
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The text is converted according to the value of kom-emacs-knows-iso-8859-1."
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  (let ((was-at-max (= (save-excursion (end-of-line) (point)) (point-max))))
    (save-excursion
      (goto-char (point-max))
      (let ((buffer-read-only nil))
	(insert (if kom-emacs-knows-iso-8859-1
		    string
		  (iso-8859-1-to-swascii string))))
      (lyskom-trim-buffer))
    (let ((window (get-buffer-window (current-buffer))))
      (if (and window was-at-max)
	  (if (pos-visible-in-window-p (point-max) window)
	      (goto-char (point-max))
	    (and kom-continuous-scrolling (lyskom-scroll)))))))
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(defun lyskom-insert-at-point (string)
  "Insert STRING in the current buffer at point.
The text is converted according to the value of
kom-emacs-knows-iso-8859-1."
  (let ((buffer-read-only nil))
    (insert (if kom-emacs-knows-iso-8859-1
                string
              (iso-8859-1-to-swascii string))))
  (lyskom-trim-buffer))  

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(defun lyskom-insert-before-prompt (string)
  "Insert STRING just before the prompt of if no prompt then just buffers.
If prompt on screen then do the scroll if necessary.
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The strings buffered are printed before the prompt by lyskom-update-prompt."
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  ;;
  ;; This is the policy for moving point:
  ;;
  ;; old-point-max is the point-max before the text is inserted
  ;; new-point-max is the point-max after the text is inserted
  ;;
  ;; If point /= old-point-max, leave the point where it is, and don't
  ;; scroll the window.
  ;;
  ;; If point = old-point-max, set it to new-point-max, and if the
  ;; buffer is in a window, make sure that point is visible.
  ;;
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  (cond
   ((and lyskom-executing-command
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         (not (eq lyskom-is-waiting t)))
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    ;; Don't insert the string until the current command is finished.
    (if (null lyskom-to-be-printed-before-prompt)
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        (setq lyskom-to-be-printed-before-prompt (lyskom-queue-create)))
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    (lyskom-queue-enter lyskom-to-be-printed-before-prompt 
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                        (list string)))
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   (t
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    ;; For some reaseon save-excursion doesn't work as expected
    (let ((oldpoint (point-marker)))
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      (goto-char (point-max))
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      (beginning-of-line)
      (let ((inhibit-read-only t))
	(insert (if kom-emacs-knows-iso-8859-1
		    string
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		  (iso-8859-1-to-swascii string))))
      (goto-char oldpoint))
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    (let ((window (get-buffer-window (current-buffer))))
      (if (and window
	       (not (pos-visible-in-window-p (point) window)))
	  ;; This mease that the prompt has been pushed off the bottom
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	  (save-selected-window
	    (select-window window)
	    (recenter -1)))))))
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(defun lyskom-message (format-string &rest args)
  "Like message, but converts iso-8859/1 texts to swascii if necessary.
Args: FORMAT-STRING &rest ARGS"
  (let ((str (apply 'format format-string args)))
    (if kom-emacs-knows-iso-8859-1
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	(message "%s" str)
      (message "%s" (iso-8859-1-to-swascii str)))))
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(defun lyskom-error (format-string &rest args)
  "Like error, but converts iso-8859/1 texts to swascii if necessary.
Args: FORMAT-STRING &rest ARGS"
  (let ((str (apply 'format format-string args)))
    (if kom-emacs-knows-iso-8859-1
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	(error "%s" str)
      (error "%s" (iso-8859-1-to-swascii str)))))
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(defun lyskom-set-last-viewed ()
  (save-excursion
    (vertical-motion 0)
    (setq lyskom-last-viewed (point))))


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;;; ================================================================
;;;                  Extended string formatting

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;;; Author: David Byers
;;; Original code: Inge Wallin

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(defvar lyskom-format-format
  "%\\(=\\)?\\(-?[0-9]+\\)?\\(#\\([0-9]+\\)\\)?\\(:\\)?\\([][@MmPpnrtsdoxc]\\)"
  "regexp matching format string parts.")
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(defun lyskom-insert-string (atom)
 "Find the string corresponding to ATOM and insert it into the LysKOM buffer." 
  (lyskom-insert (lyskom-get-string atom)))

(defun lyskom-get-string (atom)
  "Get the string corresponding to ATOM and return it."
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  (if (stringp atom)
      atom
    (let ((format-pair (assoc atom lyskom-strings)))
      (if (null format-pair)
	  (signal 'lyskom-internal-error 
		  (list 'lyskom-get-string
			(list atom ": string not found")))
	(cdr format-pair)))))


(defun lyskom-format (format-string &rest argl)
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  (format-state->result (lyskom-do-format format-string argl)))
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(defun lyskom-format-insert (format-string &rest argl)
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  "Format and insert a string according to FORMAT-STRING.
The string is inserted at the end of the buffer with `lyskom-insert'."
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  (let* ((state (lyskom-do-format format-string argl t))
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	 (start (point-max))
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	 (deferred (format-state->delayed-content state)))
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    (lyskom-insert (format-state->result state))
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    (while deferred
      (let ((defer-info (car deferred))
	    (m (make-marker)))
	(set-marker m (+ start (defer-info->pos defer-info)))
	(set-defer-info->pos defer-info m)			     
	(lyskom-defer-insertion defer-info)
	(setq deferred (cdr deferred))))))
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(defun lyskom-format-insert-at-point (format-string &rest argl)
  "Format and insert a string according to FORMAT-STRING.
The string is inserted at point."
  (let* ((state (lyskom-do-format format-string argl t))
	 (start (point))
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	 (deferred (format-state->delayed-content state)))
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    (lyskom-insert-at-point (format-state->result state))
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    (while deferred
      (let ((defer-info (car deferred))
	    (m (make-marker)))
	(set-marker m (+ start (defer-info->pos defer-info)))
	(set-defer-info->pos defer-info m)			     
	(lyskom-defer-insertion defer-info)
	(setq deferred (cdr deferred))))))
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(defun lyskom-format-insert-before-prompt (format-string &rest argl)
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  (lyskom-insert-before-prompt (format-state->result (lyskom-do-format format-string argl))))
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(defun lyskom-do-format (format-string &optional argl allow-defer)
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  "Do the actual formatting and return the resulting format-state."
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  (let ((fmt (cond ((stringp format-string) format-string)
		   ((symbolp format-string) (lyskom-get-string 
					     format-string))))
	(state nil))
    (if (null fmt)
        (signal 'lyskom-internal-error (list 'lyskom-format-insert
                                             ": bad format string"))
      (save-excursion
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        (if (and (boundp 'lyskom-buffer)
		 lyskom-buffer)
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            (set-buffer lyskom-buffer))
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	(condition-case error
	    (setq state (lyskom-format-aux (make-format-state
					    fmt
					    0
					    argl
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					    "")
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					   allow-defer))
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	  (lyskom-format-error
	   (error "LysKOM internal error formatting %s: %s%s"
		  format-string (nth 1 error) (nth 2 error))))))
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    state))
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(defun lyskom-format-aux (format-state allow-defer)
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  (let ((format-length (length (format-state->format-string format-state)))
        (arg-no nil)
        (pad-length nil)
        (format-letter nil)
        (colon-flag nil)
        (equals-flag nil)
        (abort-format nil))

    ;;
    ;;  Eat the format string bit by bit
    ;;

    (while (and (not abort-format)
                (< (format-state->start format-state)
                   format-length))

      ;;
      ;;    Look for a format letter. If there is none, finish up,
      ;;    otherwise handle each letter separately
      ;;

      (if (null (string-match lyskom-format-format
                              (format-state->format-string format-state)
                              (format-state->start format-state)))
          (progn
            (set-format-state->result 
             format-state
             (concat (format-state->result format-state)
                     (substring (format-state->format-string format-state)
                                (format-state->start format-state))))
            (set-format-state->start format-state
                                     (length (format-state->format-string
                                              format-state))))

        ;;
        ;; A format letter has been found
        ;;

        (set-format-state->result 
         format-state
         (concat (format-state->result format-state)
                 (substring (format-state->format-string format-state)
                            (format-state->start format-state)
                            (match-beginning 0))))

        (set-format-state->start format-state
                                 (match-end 0))

	(setq equals-flag (match-beginning 1)
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	      pad-length (if (match-beginning 2)
			     (string-to-int (substring 
					     (format-state->format-string
					      format-state)
					     (match-beginning 2)
					     (match-end 2)))
			   nil)
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	      arg-no (if (match-beginning 4)
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			 (string-to-int (substring (format-state->format-string
						    format-state)
						   (match-beginning 4)
						   (match-end 4)))
		       nil)
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	      colon-flag (match-beginning 5)
	      format-letter (if (match-beginning 6)
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				(aref (format-state->format-string 
				       format-state)
				      (match-beginning 6))
			      (signal 'lyskom-internal-error
				      (list 'lyskom-format-aux 
					    (format-state->format-string
					     format-state)))))
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    ;;
    ;;  If the format letter is an end-of-group letter, abort
    ;;  formatting and return to the caller.
    ;;

	(if (= ?\] format-letter)
	    (progn 
	      (setq abort-format t)
	      (set-format-state->start format-state (match-end 0)))

	  (setq format-state 
            (lyskom-format-aux-help 
             format-state
             pad-length
             arg-no
             format-letter
             equals-flag
             colon-flag
             (if (and (match-beginning 2)
                      (eq (aref (format-state->format-string format-state)
                                (match-beginning 2))
                          ?0))
                 ?0
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               ? )
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	     allow-defer))))))
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  (lyskom-tweak-format-state format-state))


(defun lyskom-format-aux-help (format-state
                               pad-length
                               arg-no
                               format-letter
                               equals-flag
                               colon-flag
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                               pad-letter
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			       allow-defer)
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  (let ((arg nil)
        (result nil)
        (propl nil)
        (prop-adjust-start 0)
        (prop-adjust-end 0)
        (oldpos (length (format-state->result format-state)))
        (abs-length (cond ((null pad-length) nil)
                          ((< pad-length 0) (- 0 pad-length))
                          (t pad-length))))
    (if (and arg-no 
             (< (format-state->args-length format-state) arg-no))
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        (signal 'lyskom-format-error (list 'lyskom-format
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                                             ": too few arguments")))
    (if arg-no
        (setq arg (nth (1- arg-no) (format-state->args format-state))))
    
    (if (format-props-p arg)        
        (setq propl (format-props->propl arg)
              arg (format-props->arg arg)))
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