lyskom-rest.el 72.1 KB
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;;;;;
;;;;; $Id$
;;;;; Copyright (C) 1991  Lysator Academic Computer Association.
;;;;;
;;;;; 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 
;;;;; the Free Software Foundation; either version 1, or (at your option) 
;;;;; 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.")


;;; ================================================================
;;;             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))))


(defun lyskom-handle-command-answer (answer)
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  "Handles a void return from call to the server."
  (lyskom-report-command-answer answer)
  (lyskom-end-of-command))


(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."
  (lyskom-tell-server (lyskom-tell-string key)))


;;;; ================================================================
;;;; Aronsson was here 5 MAY 1991
					; kom-dict-*
(defconst kom-dict
  (append
   '(
     (kom-dict-vfsh		"VFSH") ; sample assoc entry
     )
   kom-tell-phrases			; Really?
   lyskom-commands)			; Really?

  "These texts are used all over the client. They were collected into
one huge assoc list to facilitate internationalization and personal
profiling. Users are encouraged to change this dictionary for fun.

Related variables are kom-tell-phrases and lyskom-commands.")

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


;;;; ================================================================
;;;;                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.

(defun kom-recover ()
  "Try to recover from an error."
  (interactive)
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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)
  (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
	(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 ((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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  (if (boundp 'unread-command-event)
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      (setq unread-command-event last-command-event)
    (setq unread-command-char last-command-char))
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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))
	    (recenter 0))
	(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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(defun kom-view-next-text ()
  "Display next text (from lyskom-reading-list)."
  (interactive)
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  (unwind-protect
	(lyskom-start-of-command 'kom-view-next-text)
	(lyskom-tell-internat 'kom-tell-read)
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	(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))
	      
	      (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
		  (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))
		  (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
					  (not is-review))))))))
	  (lyskom-end-of-command)))
  
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;;; Modified to handle filters
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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)
  (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)
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    (lyskom-view-text text-no t nil (read-info->conf-stat tri) 
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		      priority nil t))
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  (lyskom-run 'main 'lyskom-end-of-command))


(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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  (lyskom-is-read-handler (blocking-do 'get-text-stat 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.


(defun kom-go-to-next-conf ()
  "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-start-of-command 'kom-go-to-next-conf)
  (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)
  (lyskom-go-to-next-conf))


(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.
	(if (read-info->conf-stat (read-list->first lyskom-reading-list))
	    (let ((conf-stat (read-info->conf-stat
			      (read-list->first lyskom-reading-list))))
	      (lyskom-enter-conf
	       conf-stat 
	       (read-list->first lyskom-reading-list))
	      (lyskom-set-mode-line conf-stat))))
    (lyskom-insert-string 'all-conf-unread-r)
    (lyskom-set-mode-line (lyskom-get-string 'all-conf-unread-s)))
  (lyskom-end-of-command))


(defun lyskom-maybe-move-unread (burry)
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  "Empty the reading list.
If the argument BURRY is non-nil and there are unread artilces left in the
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
	(if burry
	    (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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(defun lyskom-put-back-on-to-do-list (read-list low-priority)
  "Add the conferences on READ-LIST on lyskom-to-do-list.
Alter the priority to kom-low-priority if LOW-PRIORITY is non-nil."
  (lyskom-traverse
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      to-read (read-list->all-entries read-list)
    (if (or (eq 'CONF (read-info->type to-read))
	    (eq 'REVIEW-MARK (read-info->type to-read)))
	;; Only unread conferences and viewings of marked texts
	;; are put back on the to-do-list.
	;; E. g. unread comments to a text are not put back since they
	;; are anyhow present on a 'CONF-item's text-list.
	(progn
	  (if (and kom-low-priority
		   low-priority)
	      (set-read-info->priority to-read kom-low-priority))
	  (read-list-enter-read-info to-read
				     lyskom-to-do-list
				     (not low-priority))))))
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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))

      (if (null name)
	  nil
	(setq mode-line-conf-name 
	      (substring (concat (if (lyskom-conf-stat-p conf)
				     (format "(%d/%d) " unread total-unread)
				   "")
				 name
				 (make-string 27 ? ))
			 0 27))
	(if (not kom-emacs-knows-iso-8859-1)
	    (setq mode-line-conf-name
		  (iso-8859-1-to-swascii mode-line-conf-name))))

      (if (zerop total-unread)
	  (setq lyskom-sessions-with-unread
		(delq lyskom-proc lyskom-sessions-with-unread))
	(or (assq lyskom-proc lyskom-sessions-with-unread)
	    (setq lyskom-sessions-with-unread
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		  (cons lyskom-proc lyskom-sessions-with-unread))))
      (if (zerop letters)
	  (setq lyskom-sessions-with-unread-letters
		(delq lyskom-proc lyskom-sessions-with-unread-letters))
	(or (assq lyskom-proc lyskom-sessions-with-unread-letters)
	    (setq lyskom-sessions-with-unread-letters
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		  (cons lyskom-proc lyskom-sessions-with-unread-letters))))))
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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))


;;; ================================================================
;;; +++ Where shall this function move?

(defun lyskom-return-time (time)
  "Return a string containing the time TIME."
  (lyskom-format 'time-yyyy-mm-dd-hh-mm
	  (+ (time->year time) 1900)
	  (1+ (time->mon  time))
	  (time->mday time)
	  (time->hour time)
	  (time->min  time)))


;;;; ================================================================
;;;;                   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.
Never scrolls but leaves the point at the end of the buffer if possible without
scrolling. Leaves the point at the end of the window if not possible.
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If buffer is not on screen then doesn't move point.
The text is converted according to the value of kom-emacs-knows-iso-8859-1."
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  (goto-char (point-max))
  (let ((buffer-read-only nil))
    (insert (if kom-emacs-knows-iso-8859-1
		string
	      (iso-8859-1-to-swascii string))))
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  (lyskom-trim-buffer)
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  (let ((window (get-buffer-window (current-buffer))))
    (if window
	(if (pos-visible-in-window-p (point) window)
	    nil
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	  (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-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.
The strings buffered are printed before the prompt by lyskom-print-prompt."
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  (lyskom-do-insert-before-prompt string))

(defun lyskom-do-insert-before-prompt (string)
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  (cond
   ((and lyskom-executing-command
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	 (not lyskom-is-waiting)
	 (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 
			(list string)))
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   (t
    (goto-char (point-max))
    (let* ((window (get-buffer-window (current-buffer)))
	   (pv (and window
		    (pos-visible-in-window-p (point) window))))
      (beginning-of-line)
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      (let ((buffer-read-only nil)
	    (start (point)))
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	(insert (if kom-emacs-knows-iso-8859-1
		    string
		  (iso-8859-1-to-swascii string))))
      (goto-char (point-max))
      (if (and pv
	       (eq window (selected-window))
	       (not (pos-visible-in-window-p (point) window)))
	  (recenter -1))
      (if window
	  (if (pos-visible-in-window-p (point) window)
	      nil
	    (goto-char (window-start window))
	    (end-of-line (1- (window-height window)))))))))


(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)
  (lyskom-do-format format-string argl))

(defun lyskom-format-insert (format-string &rest argl)
  "Format and insert a string according to FORMAT-STRING"
  (lyskom-insert (lyskom-do-format format-string argl)))

(defun lyskom-format-insert-before-prompt (format-string &rest argl)
  (lyskom-insert-before-prompt (lyskom-do-format format-string argl)))


(defun lyskom-do-format (format-string &optional argl)
  (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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        (setq state (lyskom-format-aux (make-format-state
                                        fmt
                                        0
                                        argl
                                        "")))))
    (format-state->result state)))





(defun lyskom-format-aux (format-state)
  (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)
          pad-length (if (match-beginning 2)
                         (string-to-int (substring 
                                         (format-state->format-string
                                          format-state)
                                         (match-beginning 2)
                                         (match-end 2)))
                       nil)
	      arg-no (if (match-beginning 4)
                     (string-to-int (substring (format-state->format-string
                                                format-state)
                                               (match-beginning 4)
                                               (match-end 4)))
                   nil)
	      colon-flag (match-beginning 5)
	      format-letter (if (match-beginning 6)
                            (aref (format-state->format-string 
                                   format-state)
                                  (match-beginning 6))
                          (signal 'lyskom-internal-error
                                  (list 'lyskom-format-aux 
                                        (format-state->format-string
                                         format-state)))))

    ;;
    ;;  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
               ? )))))))
  (lyskom-tweak-format-state format-state))


(defun lyskom-format-aux-help (format-state
                               pad-length
                               arg-no
                               format-letter
                               equals-flag
                               colon-flag
                               pad-letter)
  (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))
        (signal 'lyskom-internal-error (list 'lyskom-format
                                             ": 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)))
    
    
    (cond
     ;;
     ;;  Format a string or symbol by simply inserting it into the
     ;;  result list
     ;;
     ((= format-letter ?s)
      (setq result (cond ((stringp arg) arg)
                         ((symbolp arg) (symbol-name arg))
                         (t (signal 'lyskom-internal-error
                                    (list 'lyskom-format
                                          ": argument error"))))))
     ;;
     ;;  Format a number by conferting it to a string and inserting
     ;;  it into the result list
     ;;
     ((or (= format-letter ?d)
          (= format-letter ?o)
          (= format-letter ?x))
      (setq result (if (integerp arg)
                       (format (format "%%%c" format-letter)
                               arg)
                     (signal 'lyskom-internal-error
                             (list 'lyskom-format
                                   ": argument error")))))
     ;;
     ;;  Format a character by converting it to a string and inserting
     ;;  it into the result list
     ;;
     ((= format-letter ?c)
      (setq result (if (integerp arg)
                       (char-to-string arg)
                     (signal 'lyskom-internal-error
                             (list 'lyskom-format
                                   ": argument error")))))
     ;;
     ;;  Format a literal percent character by inserting a string
     ;;  containing it into the result list
     ;;
     ((= format-letter ?%)
      (setq result "%")) 
     
     ;;
     ;;  Format a text property array indicator by retreiving the
     ;;  properties from the argument list and adding a start of 
     ;;  new properties to the format state
     ;;
     ((= format-letter ?@)
      (set-format-state->delayed-propl
       format-state
       (cons (cons (length (format-state->result format-state))
                   arg)
             (format-state->delayed-propl format-state))))
     ;;
     ;;  Format a subformat list by recursively formatting the contents
     ;;  of the list, augmenting the result and format state
     ;;
     ((= format-letter ?\[)
      (setq format-state (lyskom-format-aux format-state)
            result nil))
     ;;
     ;;  Format a conference or person name by retreiving information
     ;;  about the conference or person and inserting it as a button
     ;;  (unless the colon flag is set)
     ;;
     ((or (= format-letter ?M)
          (= format-letter ?P))
      (setq result
            (cond ((stringp arg) arg)
                  ((integerp arg)
                   (let ((tmp (blocking-do 'get-conf-stat arg)))
                     (if (null tmp)
                         (progn
                           (setq colon-flag t)
                           (lyskom-format (if (= format-letter ?P)
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					      (if (eq arg 0)
						  'person-is-anonymous
						'person-does-not-exist)
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                                            'conference-does-not-exist)
                                          arg))
                       (setq arg tmp)
                       (conf-stat->name arg))))
                  ((lyskom-conf-stat-p arg) (conf-stat->name arg))
                  (t (signal 'lyskom-internal-error
                             (list 'lyskom-format
                                   ": argument error")))))
      (if (and (not colon-flag)
               (lyskom-conf-stat-p arg))
          (setq propl 
                (append
                 (lyskom-default-button (if (= format-letter ?P) 'pers 'conf)
                                        arg)
                 propl))))
     ;;
     ;;  Format a conference or person number the same way as names,
     ;;  but insert the number rather than the name
     ;;
     ((or (= format-letter ?m)
          (= format-letter ?p))
      (setq result
            (cond ((integerp arg) 
                   (let ((tmp (blocking-do 'get-conf-stat arg)))
                     (if (null tmp)
                         (int-to-string arg)
                       (setq arg tmp)
                       (int-to-string arg))))
                  ((lyskom-conf-stat-p arg) 
                   (int-to-string (conf-stat->conf-no arg)))
                  (t (signal 'lyskom-internal-error
                             (list 'lyskom-format
                                   ": argument error")))))
      (if (not colon-flag)
          (setq propl 
                (append 
                 (lyskom-default-button (if (= format-letter ?p) 'pers 'conf)
                                        arg)
                 propl))))
     ;;
     ;;  Format an integer or text-stat as a text number by adding the
     ;;  by inserting a button (unless the colon flag is set)
     ;;
     ((= format-letter ?n)
      (setq result
            (cond ((integerp arg) (int-to-string arg))
                  ((lyskom-text-stat-p arg) (int-to-string
                                             (text-stat->text-no arg)))
                  (t (signal 'lyskom-internal-error
                             (list 'lyskom-format
                                   ": argument error")))))
      (if (not colon-flag)
          (setq propl
                (append (lyskom-default-button 'text arg) propl))))
     ;;
     ;;  Format a subject line by adding the subject face to the text
     ;;  properties and the subject to the result list
     ;;
     ((= format-letter ?r)
      (setq result (cond ((stringp arg) arg)
                         (t (signal 'lyskom-internal-error
                                    (list 'lyskom-format
                                          ": argument error")))))
      (if (not colon-flag)
          (setq propl (append (list 'face 'kom-subject-face) propl))))
     ;;
     ;;  Format a LysKOM text body. Currently this does nothing. It
     ;;  should parse the text for buttons
     ;;
     ((= format-letter ?t)
      (setq result
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            (cond ((stringp arg) (lyskom-format-text-body arg))
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                  ((lyskom-text-p arg) 
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		   (lyskom-format-text-body (text->text-mass arg)))
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                  (t (signal 'lyskom-internal-error
                             (list 'lyskom-format
                                   ": argument error"))))))
     
     (t (signal 'lyskom-internal-error
                (list 'lyskom-format-help format-letter))))
    
    ;;
    ;; Pad the result to the appropriate length
    ;; Fix flags so text props go in the right places anyway
    ;;
    
    (cond ((or (null pad-length)
               (null result)) nil)
          ((> abs-length (length result))
           (let ((padstring (make-string (- abs-length (length result))
                                         pad-letter)))
             (if (< pad-length 0)	; LEFT justify
                 (setq result (concat result padstring)
                       prop-adjust-end (- (- abs-length (length result))))
               (setq result (concat padstring result)
                     prop-adjust-start (- abs-length (length result))))))
          ((and equals-flag
                (< abs-length (length result)))
           (setq result (substring result 0 abs-length))))
    
    (if result
        (progn
          (set-format-state->result 
           format-state
           (concat (format-state->result format-state)
                   result))))
    (if (and propl kom-text-properties)
        (add-text-properties
         (+ oldpos prop-adjust-start)
         (+ (length (format-state->result format-state)) prop-adjust-end)
         propl
         (format-state->result format-state))))
  format-state)




(defun lyskom-tweak-format-state (format-state) 
  (let ((dp (format-state->delayed-propl format-state)))
    (while dp
      (add-text-properties (car dp)
                           (length (format-state->result format-state))
                           (cdr dp)
                           (format-state->result format-state))
      (setq dp (cdr dp)))
    (set-format-state->delayed-propl format-state nil))
  format-state)
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;;; ================================================================
;;;			 Text body formatting

;;; Author: David K}gedal
;;; This should be considered an experiment
(defvar lyskom-format-experimental nil)

(defun lyskom-format-text-body (text)
  (if lyskom-format-experimental
      (cond
       ((and (string-match "\\`html:" text)
	     (condition-case e (require 'w3) (error nil)))
	(let ((tmpbuf (generate-new-buffer "lyskom-html")))
	  (unwind-protect
	      (save-excursion
		(set-buffer tmpbuf)
		(insert (substring text 5))
		(w3-preview-this-buffer))
	    (kill-buffer tmpbuf))))
       ((and (fboundp 'format-decode-buffer)
	     (string-match "\\`enriched:" text))
	(let ((tmpbuf (generate-new-buffer "lyskom-html")))
	  (unwind-protect
	      (save-excursion
		(set-buffer tmpbuf)
		(insert (substring text 9))
		(format-decode-buffer 'text/enriched)
		(buffer-string))
	    (kill-buffer tmpbuf))))
       (t
	(lyskom-button-transform-text text)))
    (lyskom-button-transform-text text)))
    
	    
		  

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;;; ================================================================
;;;                      Iso-8859-1 converting

;;; Author: Linus Tolke Y


(defvar iso-8859-1-table 
  "	

 !\"#$%&'()*+,-./0123456789:;<=>?@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\\]^_`abcdefghijklmnopqrstuvwxyz{|}~	
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  !c#$Y|$\"c+?!-R~C+23'u$-,10?????AAAA[][CE@EEIIIIDNOOOO\\*\\UUU^YTBaaaa{}{ce`eeiiiidnoooo|/|uuu~yty"
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  "*This is a table of the chars corresponding value in SWASCII.
Used by the function iso-8859-1-to-swascii function.")


(defun iso-8859-1-to-swascii (string)
  "Returns a string without characters with code > 127.
What chars are converted to is controlled by the iso-8859-1-table."
  (mapconcat
   (function (lambda (char)
	       (substring iso-8859-1-table char (1+ char))))
   string ""))


;;;; ================================================================
;;;;                         Running in buffer 

;;; Author: Linus


(defun backward-text (&optional arg)
  "Searches backwards for a text start and recenters with that text at the top."
  (interactive "p")
  (let ((paragraph-start lyskom-text-start))
    (backward-paragraph arg))
  (end-of-line))


(defun forward-text (&optional arg)
  "Searches forward for a text start and recenters with that text at the top."
  (interactive "p")
  (let ((paragraph-start lyskom-text-start))
    (forward-paragraph arg))
  (end-of-line))


(defun kom-save-text (&optional arg)
  "Saves/appends the article before point to a file.
The article is determined by a search-backward the same as backward-text 
and then a forward-text.
With an argument ARG the search is done over that number of texts.
The name of the file is read using the minibuffer and the default is kom-text."
  (interactive "p")
  (save-excursion
    (backward-text arg)
    (let ((p1 (point))
	  (p2 (progn
		(forward-text arg)
		(beginning-of-line)
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		(point)))
	  (name (read-file-name 
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		 (if kom-emacs-knows-iso-8859-1
		     (lyskom-format 'save-on-file-q
				    (file-name-nondirectory
				     lyskom-saved-file-name))
		   (iso-8859-1-to-swascii 
		    (lyskom-format 'save-on-file-q
				   (file-name-nondirectory
				    lyskom-saved-file-name))))
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		 (file-name-directory lyskom-saved-file-name)
		 lyskom-saved-file-name
		 nil)))
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      (append-to-file p1 p2
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		      (expand-file-name name))
      (setq lyskom-saved-file-name name))))
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;;; ================================================================
;;;                             To-do


(defun lyskom-start-of-command (function &optional may-interrupt)
  "This function is run at the beginning of every LysKOM command.
It moves the cursor one line down, and +++ later it will tell the server
that the previous text has been read.

Argument FUNCTION is a string the string will be written in the buffer
on start of the command. If it is a symbol it searches for the corresponding
command name in lyskom-commands and writes this in the message buffer.

If optional argument MAY-INTERRUPT is present and non-nil,
don't signal an error if this call is interrupting another command.

Special: if lyskom-is-waiting then we are allowed to break if we set 
lyskom-is-waiting nil.
	 This function checks if doing-default-command and first-time-around 
	 are bound. The text entered in the buffer is chosen according to this"
  (if (and lyskom-is-waiting
	   (listp lyskom-is-waiting))
      (progn
	(setq lyskom-is-waiting nil)
	(lyskom-end-of-command)))
  (if (and lyskom-executing-command (not may-interrupt))
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      (lyskom-error "%s" (lyskom-get-string 'wait-for-prompt)))
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  (if (not (and (boundp 'doing-default-command)
		doing-default-command))
      (cond
       ((and (boundp 'first-time-around)
	     first-time-around))
       ((stringp function) (lyskom-insert function))
       ((and function (symbolp function))
	(let ((name (lyskom-command-name function)))
	  (if name (lyskom-insert name)))))
    (save-excursion
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      (if (not lyskom-no-prompt)
	  (let ((buffer-read-only nil))
	    (goto-char (point-max))
	    (delete-char (- (length lyskom-prompt-text))))))
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    (lyskom-insert lyskom-prompt-executing-default-command-text))
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  (if (pos-visible-in-window-p (point-max))
      (save-excursion
	(goto-char (point-max))
	(lyskom-set-last-viewed)))
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  (setq lyskom-executing-command t)
  (lyskom-insert "\n")
  (if (and (eq (window-buffer (selected-window))
	       (current-buffer))
	   (= (point) (point-max)))	;Tell user something is
      (progn
	(beginning-of-line 0)		;about to happen.
	(sit-for 0)))
;  (lyskom-scroll)
  (if kom-page-before-command		;Nice with dumb terminals.
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      (if (or (not (listp kom-page-before-command))
	      (memq function kom-page-before-command))
	  (recenter 0))))
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(defun lyskom-end-of-command ()
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  "Print prompt, maybe scroll, prefetch info."
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  (message "")
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  (let ((start 0))
    (while (and lyskom-to-be-printed-before-prompt
		(lyskom-queue->first lyskom-to-be-printed-before-prompt))
      (setq start (point-max))
      (lyskom-insert (car (lyskom-queue->first 
			   lyskom-to-be-printed-before-prompt)))
      (lyskom-queue-delete-first lyskom-to-be-printed-before-prompt)))
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  (setq lyskom-executing-command nil)
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  (setq lyskom-no-prompt t)
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  (lyskom-scroll)
  (if (pos-visible-in-window-p (point-max) (selected-window))
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      (lyskom-set-last-viewed))
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  (lyskom-prefetch-and-print-prompt)
  (run-hooks 'lyskom-after-command-hook))
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(defun lyskom-print-prompt ()
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  "Print prompt if the client knows which command will be default.
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Set lyskom-no-prompt otwherwise. Tell server what I am doing."
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  (setq lyskom-no-prompt nil)
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  (let ((to-do (lyskom-what-to-do)))
    (setq lyskom-command-to-do to-do)
    (cond
     
     ((eq to-do 'next-pri-conf)
      (lyskom-insert-string 'go-to-pri-conf-prompt)
      (beep))

     ((eq to-do 'next-pri-text)
      (lyskom-insert-string 'read-pri-text-conf)
      (beep))

     ((eq to-do 'next-text)
      (lyskom-insert
       (let ((read-info (read-list->first lyskom-reading-list)))
	 (cond
	  ((eq 'REVIEW (read-info->type read-info))
	   (lyskom-get-string 'review-next-text-prompt))
	  ((eq 'REVIEW-TREE (read-info->type read-info))
	   (lyskom-get-string 'review-next-comment-prompt))
	  ((eq 'REVIEW-MARK (read-info->type read-info))
	   (lyskom-get-string 'review-next-marked-prompt))
	  ((= lyskom-current-conf lyskom-pers-no)
	   (lyskom-get-string 'read-next-letter-prompt))
	  ((eq 'FOOTN-IN (read-info->type read-info))
	   (lyskom-get-string 'read-next-footnote-prompt))
	  ((eq 'COMM-IN (read-info->type read-info))
	   (lyskom-get-string 'read-next-comment-prompt))
	  (t (lyskom-get-string 'read-next-text-prompt))))))

     ((eq to-do 'next-conf)
      (lyskom-insert
       (cond
	((eq 'REVIEW-MARK 
	     (read-info->type (read-list->first lyskom-to-do-list)))
	 (lyskom-get-string 'go-to-conf-of-marked-prompt))
	((/= lyskom-pers-no
	     (conf-stat->conf-no
	      (read-info->conf-stat (read-list->first
				     lyskom-to-do-list))))
	 (lyskom-get-string 'go-to-next-conf-prompt))
	(t (lyskom-get-string 'go-to-your-mailbox-prompt)))))

     ((eq to-do 'when-done)
      (if (not lyskom-is-writing)
	  (lyskom-tell-server kom-mercial))
      (setq lyskom-is-waiting t)
      (lyskom-insert (let ((command (lyskom-what-to-do-when-done t)))
		       (cond			    
			((lyskom-command-name command))
			((and (stringp command)
			      (lyskom-command-name (key-binding command))))
			(t (lyskom-format 'the-command command))))))

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     ((eq to-do 'unknown)		;Pending replies from server.
      (setq lyskom-no-prompt t))

     (t (signal 'lyskom-internal-error '(lyskom-print-prompt)))))

  (if lyskom-no-prompt
      nil
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    (lyskom-insert lyskom-prompt-text))
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  (lyskom-set-mode-line))
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(defun lyskom-what-to-do ()
  "Check what is to be done. Return an atom as follows:
	next-pri-text	There is a text with higher priority to be read.
	next-pri-conf	There is a conference with higher priority to be read.
	next-text	There are texts on lyskom-reading-list.
	next-conf	There are texts on lyskom-to-do-list.
	when-done	There are no unread texts.
	unknown	        There are pending replies."
  (cond
   ((and kom-higher-priority-breaks
	 (not (read-list-isempty lyskom-reading-list))
	 (not (read-list-isempty lyskom-to-do-list))
	 (let ((type (read-info->type (read-list->first lyskom-reading-list))))
	   (or (eq kom-higher-priority-breaks 'express)
	       (eq type 'CONF)
	       (eq type 'REVIEW)
	       (eq type 'REVIEW-MARK)))
	 (> (read-info->priority (read-list->first lyskom-to-do-list))
	    (read-info->priority (read-list->first lyskom-reading-list))))
    (if (> (length 
	    (text-list->texts 
	     (read-info->text-list
	      (read-list->first lyskom-to-do-list))))
	   1)
       'next-pri-conf
      'next-pri-text))
   ((not (read-list-isempty lyskom-reading-list))
    'next-text)
   ((not (read-list-isempty lyskom-to-do-list))
    'next-conf)
   ((and lyskom-membership-is-read
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	 (= (1+ lyskom-last-conf-received)
	    (length lyskom-membership)))
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    'when-done)
   (t 'unknown)))


(defun lyskom-what-to-do-when-done (&optional nochange)
  "Returns a command, the next command to do from the kom-do-when-done.
If optional argument NOCHANGE is non-nil then the list wont be altered."
  (let* ((now (cdr lyskom-do-when-done))
	 (all (car lyskom-do-when-done))
	 (next (cond
		((and now (eq now all) (cdr all))
		 (cdr all))
		(t all)))
	 (command
	  (cond
	   ((commandp (car now)) (car now))
	   ((and (listp (car next))
		 (not (eq (car (car next))
			  'lambda)))
	    (car (setq now (car next))))
	   (t (car (setq now next))))))
    (if nochange
	nil
      (setq lyskom-do-when-done (cons next (cdr now))))
    command))


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(defun lyskom-prefetch-and-print-prompt ()
  "Prefetch info if needed. Print prompt if not already printed."
  (if (< (lyskom-known-texts)
	 lyskom-prefetch-conf-tresh)
      (lyskom-prefetch-conf))
  (lyskom-prefetch-text)
  (if (and (listp lyskom-is-waiting)
	   (eval lyskom-is-waiting))
      (progn
	(setq lyskom-is-waiting nil)
	(beep)
	(lyskom-end-of-command)
	(if (read-list-isempty lyskom-reading-list)
	    (kom-go-to-next-conf))
	(kom-next-command)))
  (if lyskom-no-prompt
      (lyskom-print-prompt)))


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(defun lyskom-known-texts ()
  "Count how many unread texts the user have, that the client knows about."
  (apply '+ (mapcar '(lambda (x) (1- (length (read-info->text-list x))))
		    (read-list->all-entries lyskom-to-do-list))))


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;;
;; Called from among others kom-list-news.
;;
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(defun lyskom-prefetch-all-confs (num-arg continuation)
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  "Gets all conferences using prefetch. Calls itself recursively.
When all confs are fetched then the function in the argument
CONTINUATION is called."
  ;; If all conf-stats are fetched, run the continuation function
  (if (>= lyskom-last-conf-fetched
	  (1- (length lyskom-membership)))
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      (lyskom-run 'main 'lyskom-run 'prefetch continuation num-arg)
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    ;; ...otherwise fetch next conf-stat.
    (let ((lyskom-prefetch-conf-tresh lyskom-max-int)
	  (lyskom-prefetch-confs lyskom-max-int))
      (lyskom-prefetch-conf))
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    (lyskom-run 'main 'lyskom-prefetch-all-confs num-arg continuation)))
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;; ---------------------------------------------------------
;; prefetch conf-stats


(defun lyskom-prefetch-conf ()
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  "Fetch conf-stats for next few conferences from lyskom-membership.
This is the main prefetch things function.

This is initiated by lyskom-refetch.

The following variables and functions are involved:
lyskom-last-conf-fetched, lyskom-last-conf-received, lyskom-last-conf-done
(this functions variables).
lyskom-membership, lyskom-unread-confs (set at login).
Functions:
lyskom-prefetch-conf, starts the ball going, later verifies that everything
is done.
lyskom-prefetch-handle-conf, starts the ball for a conf.

Idea:
This functions fetches one conf from lyskom-unread-confs, creates an empty
read-list entry and fires away a lyskom-prefetch-handle-conf. The 
lyskom-prefetch-handle-conf fills the read-list entry with articles to be
read. When all articles are fetched then lyskom-prefetch-handle-conf
will increase lyskom-last-conf-done and call lyskom-prefetch-conf that fetches
the next conf.

If we start reading before everything is fetched then two things will happen.
For every thing we do (every prompt we get) there will be another 
lyskom-prefetch-conf started and possibly another thread of 
lyskom-prefetch-handle-conf. This will not be a problem.

List news and other things that require the correct count of articles will
have to wait. The correct way of waiting is:
    (while (not (lyskom-prefetch-done))
      (lyskom-prefetch-conf)
      (accept-process-output))

If we just want to know wether we have fetched all info or not we do the test
(lyskom-prefetch-done)."
  
  ;; Algoritm:
  ;;

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  (let ((lyskom-prefetch-confs lyskom-prefetch-confs))
    (while (and (< lyskom-last-conf-fetched
		   (1- (length lyskom-membership)))
		(< (- lyskom-last-conf-fetched lyskom-last-conf-received)
		   lyskom-prefetch-confs))
      (++ lyskom-last-conf-fetched)
      (let ((membership (elt lyskom-membership lyskom-last-conf-fetched)))
	(if (lyskom-conf-no-list-member (membership->conf-no membership)
					lyskom-unread-confs)
	    (initiate-get-conf-stat 'main 'lyskom-prefetch-handle-conf
				    (membership->conf-no membership)
				    membership)
	  (++ lyskom-prefetch-confs)
	  (++ lyskom-last-conf-received))))))


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(defun lyskom-prefetch-done ()
  "Returns t if lyskom has fetched all its info."
  (> lyskom-last-conf-done
     (length lyskom-membership)))


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(defun lyskom-prefetch-handle-conf (conf-stat membership)
  "Check if there is any unread texts in a conference.
Args: CONF-STAT MEMBERSHIP"
  (++ lyskom-last-conf-received)
  (cond
   ((> (+ (conf-stat->first-local-no conf-stat)
	  (conf-stat->no-of-texts conf-stat)
	  -1)
       (membership->last-text-read membership))
    ;; There are (probably) some unread texts in this conf.
    (initiate-get-map 'prefetch 'lyskom-prefetch-handle-map
		      (conf-stat->conf-no conf-stat)
		      (1+ (membership->last-text-read membership))
		      (+ (conf-stat->no-of-texts conf-stat)
			 (conf-stat->first-local-no conf-stat)
			 (- (membership->last-text-read membership)))
		      membership
		      conf-stat))
   (t 
    (lyskom-prefetch-and-print-prompt))))


(defun lyskom-prefetch-handle-map (map membership conf-stat)
  "Add info about unread texts in a conf to the lyskom-to-do-list.
Args: MAP MEMBERSHIP CONF-STAT.
MAP is the mapping from local to global text-nos for (at least) all
texts after membership->last-text-read. MEMBERSHIP is info about the
user's membership in the conference."
  (let ((unread (lyskom-list-unread map membership)))
    (cond
     (unread
      (read-list-enter-read-info
         (lyskom-create-read-info
	    'CONF
	    conf-stat
	    (membership->priority membership)
	    (lyskom-create-text-list unread))
	 lyskom-to-do-list))))
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  ;; This could be the problem why it sometimes hang during
  ;; login. But I don't understand how it works. /davidk
  (lyskom-prefetch-and-print-prompt)
  )
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(defun lyskom-list-unread (map membership)
  "Args: MAP MEMBERSHIP. Return a list of unread texts.
The list consists of text-nos."
  (let ((res nil)
	(last-read (membership->last-text-read membership))
	(read (membership->read-texts membership))
	(first (map->first-local map))
	(i (length (map->text-nos map)))
	(the-map (map->text-nos map)))
    (while (> i 0)
      (-- i)
      (cond
       ((zerop (elt the-map i)))	;Deleted text - do nothing.
       ((<= (+ first i) last-read))	;Already read - do nothing.
       ((lyskom-vmemq  (+ i first) read)) ;Already read - do nothing.
       (t				;Unread - add to list.
	(setq res (cons
		   (elt the-map i)
		   res)))))
    res))


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(defun lyskom-conf-fetched-p (conf-no)
  "Return t if CONF-NO has been prefetched."
  (let ((n lyskom-last-conf-received)
	(result nil))
    (while (and (not result)
		(>= n 0))
      (if (= (membership->conf-no (elt lyskom-membership n))
	     conf-no)
	  (setq result t))
      (-- n))
    result))


;;-------------------------------------------------------
;; prefetch text-stats

(defun lyskom-prefetch-text ()
  "Make sure that at least lyskom-prefetch-texts texts are fetched."
  (lyskom-prefetch-from-rlist
   (lyskom-prefetch-from-rlist lyskom-prefetch-texts
			       (read-list->all-entries lyskom-reading-list))
   (read-list->all-entries lyskom-to-do-list)))


(defun lyskom-prefetch-from-rlist (n-texts rlist)
  "Prefetch first N-TEXTS texts from RLIST.
Returns number of texts that could not be fetched.
RLIST is a list of reading-info."
  (cond
   ((< n-texts 1)
    0)
   ((null rlist)
    n-texts)
   (t
    (lyskom-prefetch-from-rlist
     (lyskom-prefetch-from-list
      n-texts
      (cdr (read-info->text-list (car rlist))))
     (cdr rlist)))))


(defun lyskom-prefetch-from-list (n-texts list)
  "Prefetch first N-TEXTS texts from LIST.
Returns number of texts that could not be fetched.
RLIST is a list of text-nos. Texts whose text-no is present on
lyskom-fetched-texts are not fetched."
  (while (and (not (null list)) (> n-texts 0))
    ;; Fetch this text - but only if we are not already fetching it.
    (if (memq (car list) lyskom-fetched-texts)
	nil				;already fetched (but maybe not yet
					;received).
      (initiate-get-text-stat 'background nil (car list))
      (initiate-get-text 'background nil (car list))
      (setq lyskom-fetched-texts (cons (car list) lyskom-fetched-texts)))
    (setq list (cdr list))
    (-- n-texts))
  n-texts)


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;;;; ================================================================


(defun lyskom-vmemq (elt vector)
  "Return t if ELT is a member of (present in) VECTOR."
  (let ((found nil)
	(i (length vector)))
    (while (and (> i 0)
		(not found))
      (-- i)
      (if (eq elt (aref vector i))
	  (setq found t)))
    found))

      
(defun lyskom-read-num-range (low high &optional prompt show-range)
  "Read a number from the minibuffer.
Args: LOW HIGH &optional PROMPT SHOW-RANGE.
The read number must be within the range [LOW HIGH].
If SHOW-RANGE is non-nil, the prompt will include the range for information
to the user."
  (let ((number (1- low)))
    (while (or (< number low)
	       (> number high))
      (setq number (lyskom-read-number 
		    (concat (if prompt
				prompt
			      (lyskom-get-string 'give-a-number))
			    (if show-range
				(format "(%d-%d) " low high)
			      "")))))
    number))


(defun lyskom-read-number (&optional prompt default)
  "Read a number from the minibuffer. Optional arguments: PROMPT DEFAULT
If DEFAULT is non-nil, it is written within parenthesis after the prompt.
DEFAULT could also be of the type which (interactive P) generates.
If quit is typed it executes lyskom-end-of-command."
  (let ((numdefault (cond ((null default) nil)
			  ((integerp default) default)
			  ((listp default) (car default))
			  (t nil)))
	(number nil)
	(numstr nil)
	(quit nil))
    (while (not number)
      (setq quit t)
      (setq numstr
	    (unwind-protect
		(prog1
		  (lyskom-read-string
		   (concat (if prompt 
			       prompt
			     (lyskom-get-string 'give-a-number))
			   (if numdefault 
			       (format " (%d) " numdefault))))
		  (setq quit nil))
	      (if quit
		  (lyskom-end-of-command))))
      (cond ((and (string= numstr "") 
		  numdefault)
	     (setq number numdefault))
	    ((string-match "\\`[0-9]+\\'" numstr)
	     (setq number (string-to-int numstr)))
	    (t (beep))))
    number))


(defun lyskom-read-string (prompt &optional initial)
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  "Read a string from the minibuffer. Arguments: PROMPT INITIAL"
  (read-string (if kom-emacs-knows-iso-8859-1
		   prompt
		 (iso-8859-1-to-swascii prompt))
	       initial))
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(defun ja-or-nej-p (prompt &optional initial-input)
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  "Same as yes-or-no-p but language-dependent.
Uses lyskom-message, lyskom-read-string to do interaction and
lyskom-get-string to retrieve regexps for answer and string for repeated query."
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  (let ((answer "")
	(nagging nil))
    (while (not (or (string-match (lyskom-get-string 'yes-regexp) answer)
		    (string-match (lyskom-get-string 'no-regexp) answer)))
      (if nagging
	  (progn
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	    (lyskom-message "%s" (lyskom-get-string 'yes-or-no-nag))
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	    (sit-for 2)))
      (setq answer (lyskom-read-string (concat prompt (lyskom-get-string 'yes-or-no))
				       initial-input))
      (setq nagging t))
    (not (string-match (lyskom-get-string 'no-regexp) answer))))


(defun j-or-n-p (prompt)
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  "Same as y-or-n-p but language-dependent.
Uses lyskom-message, lyskom-read-string to do interaction and
lyskom-get-string to retrieve regexps for answer and string for repeated query."
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  (let ((input-char ?a)
	(cursor-in-echo-area t)
	(nagging nil))
    (while (not (char-in-string input-char (lyskom-get-string 'y-or-n-instring)))
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	(lyskom-message "%s" (concat (if nagging 
					 (lyskom-get-string 'j-or-n-nag)
				       "") 
				     prompt
				     (lyskom-get-string 'j-or-n)))
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	(if nagging 
	    (beep))
	(setq input-char (read-char))
	(setq nagging t))
    (char-in-string input-char (lyskom-get-string 'y-instring))))

  
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;;; lyskom-j-or-n-p, lyskom-ja-or-no-p
;;; These versions perform lyskom-end-of-command if quit is signalled
;; Author: Linus Tolke

(defun lyskom-j-or-n-p (prompt)
  "Same as j-or-n-p but performs lyskom-end-of-command if quit."
  (condition-case error
      (j-or-n-p prompt)
    (quit (lyskom-end-of-command)
	  (signal 'quit "In lyskom-j-or-n-p"))))


(defun lyskom-ja-or-nej-p (prompt &optional initial-input)
  "Same as ja-or-nej-p but performs lyskom-end-of-command if quit."
  (condition-case error
      (ja-or-nej-p prompt initial-input)
    (quit (lyskom-end-of-command)
	  (signal 'quit "In lyskom-j-or-n-p"))))



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(defun lyskom-membership-< (a b)
  "Retuns t if A has a higher priority than B. A and B are memberships."
  (> (membership->priority a)
     (membership->priority b)))


(defun impl ()
  (error "Not implemented"))


(defun lyskom-call-hook (hook-name &rest args)
  "Calls a hook with parameters.
If HOOK-NAME is bound, it is either a function name or a list of functions
to apply to the ARGS."

  (if (and (boundp hook-name) (eval hook-name))
      (if (listp (eval hook-name))
	  (mapcar '(lambda (fn)
		     (apply fn args))
		  (eval hook-name))
	(apply (eval hook-name) args))))


;;;; ================================================================
;;;; Subroutines - or as near as you can get with this com-packet.
;;;; (I know that this isn't beautiful.)


;;; Print a name.

(defun lyskom-queue-print-name (kom-queue conf-no is-person &optional format)
  "Print the name of CONF-NO. Args: KOM-QUEUE CONF-NO IS-PERSON FORMAT.
IS-PERSON should be non-nil if it is a person.
If FORMAT is non-nil this is the length the printed string should have. If nil
then a newline is printed after the name instead."
  (initiate-get-conf-stat kom-queue 'lyskom-queue-print-name-2
			  conf-no conf-no is-person format))


(defun lyskom-queue-print-name-2 (conf-stat conf-no is-person format)
  (if format
      (cond
       ((null conf-stat)
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	(lyskom-insert
	 (lyskom-fix-str format
			 (if (not is-person)
			     (lyskom-format 'conference-does-not-exist
					    conf-no)
			   (if (eq conf-no 0)
			       (lyskom-format 'person-is-anonymous)
			     (lyskom-format 'person-does-not-exist
					    conf-no))))))
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       (t (lyskom-insert (lyskom-fix-str format
					 (conf-stat->name conf-stat)))))
    (cond
     ((null conf-stat)
      (lyskom-insert (if (not is-person)
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			 (lyskom-format 'conference-does-not-exist
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					conf-no)
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		       (if (eq conf-no 0)
			   (lyskom-format 'person-is-anonymous)
			 (lyskom-format 'person-does-not-exist
					conf-no))))
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      (lyskom-insert "\n"))
     (t (lyskom-print-name conf-stat)))))


;;; The filter.

(defun lyskom-filter (proc output)
  "Receive replies from LysKOM server."
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  (sit-for 0)
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  (let (; (inhibit-quit t)		;inhibit-quit is automatically set
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					;to t in version 18.57, but not in
					;all older versions of emacs.
	(old-match-data (match-data))
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	;; lyskom-filter-old-buffer is also changed when starting to edit
	;; in function lyskom-edit-text.
	(lyskom-filter-old-buffer (current-buffer)))
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    (unwind-protect
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	(progn

	  (cond
	   (lyskom-debug-communications-to-buffer
	    (set-buffer (get-buffer-create
			 lyskom-debug-communications-to-buffer-buffer))
	    (save-excursion
	      (goto-char (point-max))
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	      (insert "\n"
		      (format "%s" proc)
		      "-----> "  output))))
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	  (set-buffer (process-buffer proc))
	  (princ output lyskom-unparsed-marker)	;+++lyskom-string-skip-whitespace
	  (setq inhibit-quit nil)	;We are allowed to break here.
	  (cond
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	   ((not (string-match "\n" output)))
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	   ((null lyskom-is-parsing)	;Parse one reply at a time.
	    (setq lyskom-is-parsing t)
	    (unwind-protect
		(condition-case
		    error-type
		    (lyskom-parse-unparsed)
		  (lyskom-parse-incomplete)) ;Incomplete answers are normal.
	      (set-buffer (process-buffer proc)) ;In case it was changed by
					;        ;the handler.
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	      (setq lyskom-is-parsing nil))))
	  )
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      ; Restore selected buffer and match data.

      (store-match-data old-match-data)
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      (setq inhibit-quit nil)	;We are allowed to break here.
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      (set-buffer lyskom-filter-old-buffer))))
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;;; The sentinel

(defun lyskom-sentinel (proc sentinel)
  "Handles changes in the lyskom-process."
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  (setq lyskom-sessions-with-unread
	(delq proc lyskom-sessions-with-unread))
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