commands1.el

;;;;; -*-coding: iso-8859-1;-*-
;;;;;
;;;;; $Id$
;;;;; Copyright (C) 1991-2002  Lysator Academic Computer Association.
;;;;;
;;;;; This file is part of the LysKOM Emacs LISP client.
;;;;; 
;;;;; 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 2, 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. 
;;;;;
;;;; ================================================================
;;;; ================================================================
;;;;
;;;; File: commands1.el
;;;;
;;;; This file contains the code for some of the high level commands.
;;;;

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

(eval-when-compile
  (require 'lyskom-command "command"))


;;; ================================================================
;;;                  F} uppmuntran - Get appreciation 

;;; Author: Inge Wallin


(def-kom-command kom-get-appreciation ()
  "Provides a little light in the dark."
  (interactive)
  (lyskom-insert-string 'appreciation))
  

;;; ================================================================
;;;                      F} Sk{ll - Get abuse

;;; Author: Inge Wallin


(def-kom-command kom-get-abuse ()
  "Provides a bit of verbal abuse."
  (interactive)
  (lyskom-insert-string 'abuse))


;;; ================================================================
;;;            Utpl}na - Delete a person or a conference

;;; Author: Inge Wallin


(def-kom-command kom-delete-conf ()
  "Deletes a person or a conference. In order to delete a conference
you must be the supervisor of the conference. Once a conference is
deleted, it can never be restored, and texts with no recipients other
than the deleted conference will become inaccessible, and will
eventually be permanently deleted."
  (interactive)
  (let ((conf-stat 
	 (lyskom-read-conf-stat (lyskom-get-string 'what-conf-to-delete)
				'(all) nil nil t)))
    (if conf-stat
	(if (lyskom-ja-or-nej-p
	     (lyskom-format 'confirm-delete-pers-or-conf
			    (if (conf-type->letterbox (conf-stat->conf-type 
						       conf-stat))
				(lyskom-get-string 'the-pers)
			      (lyskom-get-string 'the-conf))
			    (conf-stat->name conf-stat)))
	    (if (blocking-do 'delete-conf
			     (conf-stat->conf-no conf-stat))
		(progn
		  (lyskom-format-insert 'conf-is-deleted
					(conf-stat->name conf-stat))
		  (when (= (conf-stat->conf-no conf-stat)
			   lyskom-pers-no)
		    (lyskom-insert (lyskom-get-string
				    'you-have-deleted-yourself))
		    (setq lyskom-pers-no nil
			  lyskom-membership nil
			  lyskom-to-do-list (lyskom-create-read-list)
			  lyskom-reading-list (lyskom-create-read-list)
			  lyskom-pending-commands (cons
						   'kom-start-anew
						   lyskom-pending-commands))))
	      (lyskom-format-insert 'you-could-not-delete
				    conf-stat))
	  (lyskom-insert-string 'deletion-not-confirmed))
      (lyskom-insert-string 'somebody-else-deleted-that-conf))))


;;; ================================================================
;;;                Radera (text) - Delete a text

;;; Author: Inge Wallin


(def-kom-command kom-delete-text (text-no)
  "Permanently deletes a text. In order to delete a text you must
be the author of the text, or the supervisor of the author.

It is a very bad idea to delete texts that have comments. By deleting
a text with comments, the comments lost their context. This can lead
to fragmented discussion trees, where it is impossible to understand
what a comment means, or indeed what the whole discussion is about.

Instead of deleting a text, consider moving it to a conference created
specifically for storing texts that are no longer interesting. Several
LysKOM systems have such conferences, so ask around.

This command accepts text number prefix arguments (see
`lyskom-read-text-no-prefix-arg')."
  (interactive (list (lyskom-read-text-no-prefix-arg 'what-text-to-delete)))
  (if text-no
      (let* ((text-stat (blocking-do 'get-text-stat text-no))
             (num-marks (and text-stat (text-stat->no-of-marks text-stat)))
             (num-comments (and text-stat (length (lyskom-text-comments text-stat))))
             (is-marked-by-me (cache-text-is-marked text-no)))

        (if (null text-stat)
            (lyskom-report-command-answer nil)
          (when (and (or (eq 0 num-marks)
                         (lyskom-j-or-n-p 
                          (lyskom-format 'delete-marked-text
                                         (if (> num-marks 0)
                                             (if is-marked-by-me
                                                 (if (= num-marks 1)
                                                     (lyskom-get-string 'delete-marked-by-you)
                                                   (lyskom-format 'delete-marked-by-you-and-others
                                                                  (1- num-marks)))
                                               (lyskom-format 'delete-marked-by-several
                                                              num-marks))))))
                     (or (eq 0 num-comments)
                         (progn (lyskom-format-insert "%#1@%#2t\n" 
                                                      `(face ,kom-warning-face)
                                                      (lyskom-get-string 'delete-commented-text-help))
                                (lyskom-beep t)
                                (and (lyskom-j-or-n-p
                                      (lyskom-get-string 'delete-commented-text))
                                     (lyskom-j-or-n-p
                                      (lyskom-get-string 'really-delete-commented-text))))))
            (lyskom-format-insert 'deleting-text text-no)
            (when (lyskom-report-command-answer 
                   (blocking-do 'delete-text text-no))
              (when is-marked-by-me
                (lyskom-unmark-text text-no))))))
    (lyskom-insert 'confusion-what-to-delete)))



;;; ================================================================
;;;        ]terse presentation - Review the presentation
;;;               for a person or a conference

;;; Author: Inge Wallin


(def-kom-command kom-review-presentation (&optional text-or-conf-no)
  "Reviews the presentation for a person or a conference. If you give
a prefix argument it is treated as a text number prefix argument (see
`lyskom-read-text-no-prefix-arg'), and this command shows the
presentation of the author of that text.

This command accepts text number prefix arguments (see
`lyskom-read-text-no-prefix-arg')."
  (interactive (and current-prefix-arg ; only peek at textno:s when prefixed!
		    (list (lyskom-read-text-no-prefix-arg
			   'text-to-see-author-of))))
  (let ((conf-stat
         (if text-or-conf-no
             (blocking-do 'get-conf-stat
                          (if (interactive-p)
                              (text-stat->author
                               (blocking-do 'get-text-stat text-or-conf-no))
                            text-or-conf-no))
           (lyskom-read-conf-stat
            (lyskom-get-string 'presentation-for-whom)
            '(all)
            nil "" t))))
    (lyskom-review-presentation conf-stat)))

(def-kom-command kom-unread-presentation (&optional text-or-conf-no)
  "Marks the presentation for a person or a conference as unread. If
you give a prefix argument it is treated as a text number prefix
argument (see `lyskom-read-text-no-prefix-arg'), and this command
unreads the presentation of the author of that text.

This command accepts text number prefix arguments (see
`lyskom-read-text-no-prefix-arg')."
  (interactive (and current-prefix-arg ; only peek at textno:s when prefixed!
		    (list (lyskom-read-text-no-prefix-arg
			   'text-to-unread-author-of))))
  (let ((conf-stat
         (if text-or-conf-no
             (blocking-do 'get-conf-stat
                          (if (interactive-p)
                              (text-stat->author
                               (blocking-do 'get-text-stat text-or-conf-no))
                            text-or-conf-no))
           (lyskom-read-conf-stat
            (lyskom-get-string 'unread-presentation-for-whom)
            '(all)
            nil "" t))))
    (if (zerop (conf-stat->presentation conf-stat))
        (lyskom-format-insert 'has-no-presentation conf-stat)
      (lyskom-format-insert 'marking-text-unread
                            (conf-stat->presentation conf-stat))
      (lyskom-report-command-answer
       (lyskom-mark-unread (conf-stat->presentation conf-stat))))))

(defun lyskom-review-presentation (conf-stat)
  "Review the presentation of conference CONF-STAT."
  (if (null conf-stat)
      (lyskom-insert-string 'somebody-deleted-that-conf)
    (lyskom-format-insert 'review-presentation-of
                          conf-stat)
    (if (/= (conf-stat->presentation conf-stat) 0)
        (lyskom-view-text (conf-stat->presentation conf-stat))
      (lyskom-format-insert 'has-no-presentation
                            conf-stat))
    (lyskom-traverse faq (lyskom-get-aux-item 
                          (conf-stat->aux-items conf-stat)
                          14)
      (lyskom-print-comment-like-aux faq conf-stat))))  

(defun lyskom-print-comment-like-aux (item object)
  (let* ((text-no (string-to-int (aux-item->data item)))
         (text-stat nil)
         (text nil))
    (unless kom-deferred-printing
      (blocking-do-multiple ((x-text (get-text text-no))
                             (x-text-stat (get-text-stat text-no)))
        (setq text-stat x-text-stat text x-text)))

    (cond ((or text-stat (not kom-deferred-printing))
           (lyskom-insert-comment-like-aux item text-no text-stat text object))
          (t (let ((defer-info (lyskom-create-defer-info
                                'get-text-stat
                                text-no
                                'lyskom-insert-deferred-comment-like-aux
                                (point-max-marker)
                                (length lyskom-defer-indicator)
                                nil     ; Filled in later
                                (list item object text-no))))
               (lyskom-format-insert "%#1s\n" lyskom-defer-indicator)
               (lyskom-defer-insertion defer-info))))))

(defun lyskom-insert-comment-like-aux (item text-no text-stat text object)
  (let* ((author (if text-stat (text-stat->author text-stat) nil))
         (mx-from (car (lyskom-get-aux-item (text-stat->aux-items text-stat)
                                            17)))
         (mx-author (car (lyskom-get-aux-item (text-stat->aux-items text-stat)
                                              16)))
         (formats (lyskom-aux-item-definition-field item 'text-header-line))
         (subject (lyskom-print-faq-format-subject text text-stat text-no))
         content-type
         )
    (if (and mx-from
             (setq content-type
                   (car (lyskom-get-aux-item (text-stat->aux-items 
                                              text-stat) 1))))
        (progn (string-match "^\\(\\S-+\\)" (aux-item->data content-type))
               (setq content-type (format "(%s) "
                                          (aux-item->data content-type))))
      (setq content-type ""))
    (setq author (or (lyskom-format-mx-author mx-from mx-author) author))

    (lyskom-format-insert (cond ((not (listp formats)) formats)
                                ((<= (length formats) 1) (car formats))
                                (author (elt formats 1))
                                (t (elt formats 0)))
                          text-no
                          author
                          content-type
                          (lyskom-aux-item-terminating-button item
                                                              object)
                          subject)
    (lyskom-insert "\n")))

;;; FIXME: This contains code that duplicates the code in 
;;; lyskom-insert-deferred-header-comm. That's a BAD THING.

(defun lyskom-insert-deferred-comment-like-aux (text-stat defer-info)
  (initiate-get-text 'deferred
                     'lyskom-insert-deferred-comment-like-aux-2
                     (elt (defer-info->data defer-info) 2)
                     text-stat
                     defer-info))

(defun lyskom-insert-deferred-comment-like-aux-2 (text text-stat defer-info)
  (let* ((author (if text-stat (text-stat->author text-stat) nil))
         (item (elt (defer-info->data defer-info) 0))
         (object (elt (defer-info->data defer-info) 1))
         (text-no (elt (defer-info->data defer-info) 2))
         (mx-from (car (lyskom-get-aux-item (text-stat->aux-items text-stat)
                                            17)))
         (mx-author (car (lyskom-get-aux-item (text-stat->aux-items text-stat)
                                              16)))
         (formats (lyskom-aux-item-definition-field item 'text-header-line))
         (subject (lyskom-print-faq-format-subject text text-stat text-no))
         content-type
         )
    (if (and mx-from
             (setq content-type
                   (car (lyskom-get-aux-item (text-stat->aux-items 
                                              text-stat) 1))))
        (progn (string-match "^\\(\\S-+\\)" (aux-item->data content-type))
               (setq content-type (format "(%s) "
                                          (aux-item->data content-type))))
      (setq content-type ""))
    (setq author (or (lyskom-format-mx-author mx-from mx-author) author))

    (set-defer-info->format defer-info 
                            (cond ((not (listp formats)) formats)
                                  ((<= (length formats) 1) (car formats))
                                  (author (elt formats 1))
                                  (t (elt formats 0))))
    (lyskom-replace-deferred defer-info
                             text-no
                             author
                             content-type
                             (lyskom-aux-item-terminating-button item
                                                                 object)
                             subject)))






;;; ================================================================
;;;          Återse det kommenterade - View commented text

;;; Author: Inge Wallin
;;; Modified by: David Kågedal, Johan Sundström

(def-kom-command kom-view-commented-text (text-no)
  "Views the text that the selected text is a comment to. If the
current text is comment or footnote to several texts then the first
text is shown and the remaining texts are reviewed.

This command accepts text number prefix arguments (see
`lyskom-read-text-no-prefix-arg').

See `kom-review-uses-cache'."
  (interactive (list (lyskom-read-text-no-prefix-arg 'review-commented-q)))
  (if text-no
      (progn
	(lyskom-tell-internat 'kom-tell-read)
        (unless kom-review-uses-cache
          (cache-del-text-stat text-no))
	(lyskom-view-commented-text
	 (blocking-do 'get-text-stat text-no)))
    (lyskom-insert-string 'confusion-what-to-view)))

(def-kom-command kom-unread-commented-text (text-no)
  "MArkes the texts that the selected text is a comment to as unread.

This command accepts text number prefix arguments (see
`lyskom-read-text-no-prefix-arg')."
  (interactive (list (lyskom-read-text-no-prefix-arg 'unread-commented-q)))
  (if text-no
      (lyskom-unread-commented-text 
       (blocking-do 'get-text-stat text-no))
    (lyskom-insert-string 'confusion-what-to-mark-unread)))


(def-kom-command kom-view-previous-commented-text (text-no)
  "Views the text that the selected text is a comment to. If the
current text is comment or footnote to several texts then the first
text is shown and the remaining texts are reviewed.

Without a prefix argument this will display the text that the
next-to-last text in the buffer is a comment to. With a prefix
argument this command is identical to `kom-view-commented-text'.

This command accepts text number prefix arguments (see
`lyskom-read-text-no-prefix-arg')

See `kom-review-uses-cache'."
  (interactive (list (lyskom-read-text-no-prefix-arg 'review-commented-q nil
                                                     lyskom-previous-text)))
  (cond (text-no
         (lyskom-tell-internat 'kom-tell-read)
        (unless kom-review-uses-cache
          (cache-del-text-stat text-no))
         (lyskom-view-commented-text
          (blocking-do 'get-text-stat text-no)))
        (t (lyskom-insert-string 'confusion-what-to-view))))


(def-kom-command kom-unread-previous-commented-text (text-no)
  "Marks the texts that the selected text is a comment to as unread.

Without a prefix argument this will display the text that the
next-to-last text in the buffer is a comment to. With a prefix
argument this command is identical to `kom-unread-commented-text'.

This command accepts text number prefix arguments (see
`lyskom-read-text-no-prefix-arg')"
  (interactive (list (lyskom-read-text-no-prefix-arg 'review-commented-q nil
                                                     lyskom-previous-text)))
  (if text-no
      (lyskom-unread-commented-text
       (blocking-do 'get-text-stat text-no))
    (lyskom-insert-string 'confusion-what-to-mark-unread)))


(defun lyskom-text-stat-commented-texts (text-stat)
  "Return a list of the text-nos that TEXT-STAT is a comment or footnote to."
  (let* ((misc-info-list (and text-stat
                              (text-stat->misc-info-list text-stat)))
         (misc-infos (and misc-info-list
                          (append (lyskom-misc-infos-from-list
                                   'COMM-TO misc-info-list)
                                  (lyskom-misc-infos-from-list
                                   'FOOTN-TO misc-info-list)))))
    (and misc-infos
	 (mapcar
	  (function
	   (lambda (misc-info)
	     (if (equal (misc-info->type misc-info)
			'COMM-TO)
		 (misc-info->comm-to misc-info)
	       (misc-info->footn-to misc-info))))
	  misc-infos))))


(defun lyskom-view-commented-text (text-stat)
  "Handles the return from the initiate-get-text-stat, displays and builds list."
  (let ((text-nos (lyskom-text-stat-commented-texts text-stat)))
    (if text-nos
        (progn
          (lyskom-format-insert 'review-text-no 
                                (car text-nos))
          (if (cdr text-nos)
              (read-list-enter-read-info
               (lyskom-create-read-info
                'REVIEW nil (lyskom-review-get-priority)
                (lyskom-create-text-list (cdr text-nos))
                lyskom-current-text)
               lyskom-reading-list t))
          (unless kom-review-uses-cache
            (cache-del-text-stat (car text-nos)))
          (lyskom-view-text (car text-nos)
			    nil nil nil 
			    nil nil nil
			    t))
      (lyskom-insert-string 'no-comment-to))))

(defun lyskom-unread-commented-text (text-stat)
  "Marks the texts that TEXT-STAT is a comment to as unread."
  (let ((text-nos (lyskom-text-stat-commented-texts text-stat)))
    (if text-nos
        (lyskom-traverse text-no text-nos
          (lyskom-format-insert 'marking-text-unread text-no)
          (lyskom-report-command-answer (lyskom-mark-unread text-no)))
      (lyskom-insert-string 'no-comment-to-to-unread))))


(defun lyskom-misc-infos-from-list (type list)
  "Get all the misc-infos from the misc-info-list LIST with the same type
as TYPE. If no such misc-info, return NIL"
  (let ((result nil))
    (while list
      (when (equal type (misc-info->type (car list)))
        (setq result (cons (car list) result)))
      (setq list (cdr list)))
    (nreverse result)))


;;; ================================================================
;;;                         Brev - Send letter
;;; Author: Inge Wallin

(def-kom-command kom-send-letter (&optional pers-no)
  "Send a personal letter to a person. This command is similar to
`kom-write-text', but intended specifically for sending personal
messages. When reading the recipient it will only allow letterboxes."
  (interactive)
  (condition-case nil
      (progn
        (lyskom-tell-internat 'kom-tell-write-letter)
	;; If there was a motd, which is now removed we have to
	;; refetch the conf-stat to know that.
        (let* ((tono (or pers-no
                         (lyskom-read-conf-no
                          (lyskom-get-string 'who-letter-to)
                          '(pers) nil nil t)))
               (conf-stat (blocking-do 'get-conf-stat tono)))
	  (cache-del-conf-stat tono)
          (if (if (zerop (conf-stat->msg-of-day conf-stat))
                  t
                (progn
                  (recenter 1)
                  (lyskom-format-insert 'has-motd 
                                        conf-stat)
                  (lyskom-view-text (conf-stat->msg-of-day conf-stat))
                  (if (lyskom-j-or-n-p (lyskom-get-string 'motd-persist-q))
                      t
                    nil)))
              (if (= tono lyskom-pers-no)
                  (lyskom-edit-text lyskom-proc
                                    (lyskom-create-misc-list 'RECPT tono)
                                    "" "")
                (lyskom-edit-text lyskom-proc
                                  (if (lyskom-get-membership tono)
                                      (lyskom-create-misc-list 'RECPT tono)
                                      (lyskom-create-misc-list 
                                       'RECPT tono
                                       'RECPT lyskom-pers-no))
                                  "" "")))))
    (quit (signal 'quit nil))))


;;; ================================================================
;;;           Bli medlem i m|te - Become a member of a conference
;;;             Addera medlem - Add somebody else as a member

;;; Author: ???
;;; Rewritten by: David K}gedal


;; Add another person

(def-kom-command kom-add-member ()
  "Invite a person as a member of a conference. Depending on the
server configuration this command may either create an invitation or
simply make the person a member of the conference without asking them
for confirmation."
  (interactive)
  (let* ((who (lyskom-read-conf-stat (lyskom-get-string 'who-to-add)
				     '(pers) nil nil t))
	 (whereto (lyskom-read-conf-stat (lyskom-get-string 'where-to-add)
					 '(all) nil nil t))
	 (pers-stat (blocking-do 'get-pers-stat (conf-stat->conf-no who))))
    (lyskom-add-member-answer (lyskom-try-add-member whereto who 
                                                     pers-stat 
                                                     nil
                                                     nil
                                                     t)
			      whereto who)))



;; Add self

(def-kom-command kom-add-self (&optional conf)
  "Become a member of a conference. The default priority of the
membership is determined by `kom-membership-default-priority' and its
placement by `kom-membership-default-placement' You can also use this
command to change the priority of an existing membership and to
re-join a conference of which you are a passive member.

See `kom-membership-default-priority' and 
`kom-membership-default-placement'"
  (interactive)
  (let* ((whereto (if conf (blocking-do 'get-conf-stat conf)
                    (lyskom-read-conf-stat 
                     (lyskom-get-string 'where-to-add-self)
                     '(all) nil "" t)))
         (who (blocking-do 'get-conf-stat lyskom-pers-no))
         (pers-stat (blocking-do 'get-pers-stat lyskom-pers-no))
         (mship (lyskom-get-membership (conf-stat->conf-no whereto) t))
         (no-of-unread
          (unless (and mship (not (membership-type->passive
                                   (membership->type mship))))
            (lyskom-read-num-range-or-date 
             0 
             (conf-stat->no-of-texts whereto)
             (lyskom-format 'initial-unread)
             nil
             t
             nil))))

    ;; Fake kom-membership-default-priority if this is a passive membership
    ;; This will suppress the normal "which priority" question. Ugly hack.

    (let ((kom-membership-default-priority
           (if (and mship (membership-type->passive (membership->type mship)))
               (membership->priority mship)
             kom-membership-default-priority)))

      (lyskom-add-member-answer (lyskom-try-add-member whereto
                                                       who
                                                       pers-stat
                                                       nil
                                                       nil
                                                       t
                                                       nil
                                                       no-of-unread)
                                whereto who
                                no-of-unread))))


(def-kom-command kom-change-priority (&optional conf)
  "Changes the priority of a single membership. If you want to change
the priority of several memberships, use `kom-prioritize' instead."
  (interactive)
  (let* ((conf-stat (if conf (blocking-do 'get-conf-stat conf)
                      (lyskom-read-conf-stat 
                       (lyskom-get-string 'change-priority-for-q)
                       '(all) nil "" t)))
         (mship (lyskom-get-membership (conf-stat->conf-no conf-stat) t))
	 (kom-membership-default-priority nil))
    (blocking-do-multiple ((who (get-conf-stat lyskom-pers-no))
                           (pers-stat (get-pers-stat lyskom-pers-no)))
      (cond ((and (null mship) conf-stat)
             (lyskom-format-insert 'not-member-of-conf conf-stat))
	    ((null conf-stat)
	     (lyskom-format-insert 'no-such-conf))
            (t (lyskom-add-member-answer
                (lyskom-try-add-member conf-stat who pers-stat nil
                                       'change-priority-for t)
                conf-stat who))))))
                                                           
                                     



;;; NOTE: This function is also called from lyskom-go-to-conf-handler
;;;       and from lyskom-create-conf-handler.

(defun lyskom-add-member-by-no (conf-no pers-no &optional thendo &rest data)
  "Fetch info to be able to add a person to a conf.
Get the conf-stat CONF-NO for the conference and the conf-stat and pers-stat 
for person PERS-NO and send them into lyskom-try-add-member."
  (blocking-do-multiple ((whereto (get-conf-stat conf-no))
                         (who (get-conf-stat pers-no))
                         (pers-stat (get-pers-stat pers-no)))
    (let ((result (lyskom-try-add-member whereto who pers-stat nil nil t)))
      (lyskom-add-member-answer result whereto who)
      (if thendo
          (apply thendo data))
      (car result))))


(defun lyskom-try-add-member (conf-conf-stat 
                              pers-conf-stat 
                              pers-stat
                              membership-type
                              &optional message-string
                              need-extra-information
                              default-priority
                              no-of-unread)
  "Add a member to a conference.
Args: CONF-CONF-STAT PERS-CONF-STAT PERS-STAT
CONF-CONF-STAT: the conf-stat of the conference the person is being added to
PERS-CONF-STAT: the conf-stat of the person being added.
PERS-STAT: the pers-stat of the person being added.

Optional MESSAGE-STRING is the message to print before making server call.
Returns t if it was possible, otherwise nil.

If optional NEED-EXTRA-INFORMATION is non-nil, the return value will be
a list where the first element is the result of add-member and the second
is the position where the membership was placed.

If optional USE-PRIORITY is non-nil then use that as the priority.
"
  (cond ((null no-of-unread))

        ((numberp no-of-unread)
         (setq no-of-unread (lyskom-format 'member-in-conf-with-unread
                                           no-of-unread)))
        ((listp no-of-unread)
                 (setq no-of-unread
                       (lyskom-format 'member-in-conf-with-unread-date
                                      (elt no-of-unread 0)
                                      (car (rassq (elt no-of-unread 1)
                                                  lyskom-month-names))
                                      (elt no-of-unread 2)))))

  (if (or (null conf-conf-stat)
	  (null pers-conf-stat))
      nil				; We have some problem here.
    (let ((priority
           (if (/= lyskom-pers-no (conf-stat->conf-no pers-conf-stat))
               (lyskom-read-num-range 0 255
                                      (lyskom-get-string 'other-priority-q)
                                      nil 100)
             (if (and (numberp kom-membership-default-priority)
                      (< kom-membership-default-priority 256)
                      (>= kom-membership-default-priority 0))
                 kom-membership-default-priority
               (lyskom-read-num-range 0 255 (lyskom-get-string 'priority-q) nil default-priority))))
	  (where
	   (if (/= lyskom-pers-no (conf-stat->conf-no pers-conf-stat))
	       1			; When adding someone else
	     (cond
	      ((and (numberp kom-membership-default-placement)
		    (>= kom-membership-default-placement 0))
	       kom-membership-default-placement)
	      ((eq kom-membership-default-placement 'first)
	       0)
	      ((eq kom-membership-default-placement 'last)
	       (length lyskom-membership))
	      (t
	       (lyskom-read-num-range
		0 (pers-stat->no-of-confs pers-stat)
		(lyskom-format 'where-on-list-q
			       (length lyskom-membership))))))))

      ;;
      ;; Adding ourselves. Adjust where so the membership
      ;; list remains sorted. Find the closest position to
      ;; where at which we can put the membership and keep
      ;; the membership lsit sorted.
      ;;

      (when (eq lyskom-pers-no (conf-stat->conf-no pers-conf-stat))
        (let ((mship-list lyskom-membership)
              (mship nil)
              (index 0)
              (found nil))
          (while mship-list
            (setq mship (car mship-list)
                  mship-list (cdr mship-list))
            (cond ((> (membership->priority mship) priority))
                  ((< (membership->priority mship) priority) 
                   (setq where index mship-list nil found t))
                  ((and (= (membership->priority mship) priority)
                        (= index where))
                   (setq mship-list nil found t))
                  ((and (= (membership->priority mship) priority)
                        (> index where))
                   (setq where index mship-list nil found t)))
            (setq index (1+ index))
            (unless found (setq where (1+ index))))))

      (when (null membership-type)
        (setq membership-type 
              (lyskom-create-membership-type nil nil nil nil
                                             nil nil nil nil)))

      (if message-string
          (lyskom-format-insert message-string
                                pers-conf-stat
                                conf-conf-stat)
        (if (= (conf-stat->conf-no pers-conf-stat)
               lyskom-pers-no)
            (lyskom-format-insert 'member-in-conf
                                  conf-conf-stat
                                  no-of-unread)
          (lyskom-format-insert 'add-member-in
                                pers-conf-stat
                                conf-conf-stat)))
      (lyskom-ignoring-async (18 lyskom-pers-no
                                 (conf-stat->conf-no conf-conf-stat))
        (let ((res (blocking-do 'add-member 
                                (conf-stat->conf-no conf-conf-stat)
                                (conf-stat->conf-no pers-conf-stat)
                                priority where
                                membership-type)))
          (if need-extra-information
              (list res where)
            res))))))


(defun lyskom-add-member-answer (answer 
                                 conf-conf-stat
                                 pers-conf-stat
                                 &optional no-of-unread)
  "Handle the result from an attempt to add a member to a conference."
  (let ((pos (if (consp answer) (elt answer 1) nil))
        (answer (if (consp answer) (elt answer 0) answer)))
    (if (null answer)
        (progn
          (lyskom-insert-string 'nope)
          (let* ((errno lyskom-errno)
                 (err-stat lyskom-err-stat)
                 (is-supervisor (lyskom-is-supervisor (conf-stat->conf-no conf-conf-stat)
                                                      lyskom-pers-no))
                 (is-member (lyskom-is-member (conf-stat->conf-no conf-conf-stat)
                                              (conf-stat->conf-no pers-conf-stat)))
                 (rd-prot (conf-type->rd_prot (conf-stat->conf-type conf-conf-stat))))


            (cond (is-member
                   (lyskom-format-insert 'add-already-member 
                                         pers-conf-stat
                                         conf-conf-stat))
                  ((and rd-prot is-supervisor)
                   (lyskom-insert-error errno err-stat))

                  (rd-prot (let ((supervisorconf (blocking-do
                                                  'get-conf-stat
                                                  (conf-stat->supervisor conf-conf-stat))))
                             (if supervisorconf
                                 (lyskom-format-insert 'is-read-protected-contact-supervisor
                                                       conf-conf-stat
                                                       supervisorconf)
                               (lyskom-format-insert 'cant-find-supervisor
                                                     conf-conf-stat))))

                  (t (lyskom-insert-error errno err-stat)))))

      ;;+++Borde {ndra i cachen i st{llet.
      (cache-del-pers-stat (conf-stat->conf-no pers-conf-stat))
      ;;+++Borde {ndra i cachen i st{llet.
      (cache-del-conf-stat (conf-stat->conf-no conf-conf-stat))
      (when (= (conf-stat->conf-no pers-conf-stat)
             lyskom-pers-no)
        (when no-of-unread
          (cond ((listp no-of-unread)
                 (let* ((target-date (lyskom-create-time 0 0 0 (elt no-of-unread 2) (elt no-of-unread 1) (elt no-of-unread 0) 0 0 nil))
                        (text (lyskom-find-text-by-date conf-conf-stat target-date)))
                   (when text
                     (blocking-do 'set-last-read 
                                  (conf-stat->conf-no conf-conf-stat)
                                  (car text)))))
                ((numberp no-of-unread) 
                 (blocking-do 'set-unread (conf-stat->conf-no conf-conf-stat)
                              no-of-unread))))
        (let ((mship (blocking-do 'query-read-texts
                                  lyskom-pers-no 
                                  (conf-stat->conf-no conf-conf-stat)
                                  t 0)))
          (if (< (membership->priority mship) lyskom-session-priority)
              (lyskom-format-insert-before-prompt
               'member-in-conf-with-low-priority
               conf-conf-stat)
            (unless (membership->position mship)
              (set-membership->position mship pos))
            (if (lyskom-try-get-membership (conf-stat->conf-no conf-conf-stat) t)
                (progn (lyskom-replace-membership mship)
                       (lyskom-fetch-start-of-map conf-conf-stat mship))
              (lyskom-add-membership mship
                                     conf-conf-stat
                                     t)))))
      (lyskom-insert-string 'done))))



(defun lyskom-add-membership (membership conf-no-or-stat &optional blocking)
  "Adds MEMBERSHIP to the sorted list of memberships.
If BLOCKING is non-nil, block while reading the conference map until at 
least one text has been seen. CONF-NO-OR-STAT is the conf-no to add 
unless BLOCKING is t, in which cast it is the conf-stat."
  (if membership
      (progn
	(lyskom-insert-membership membership)
        (if blocking
            (lyskom-fetch-start-of-map conf-no-or-stat membership)
          (lyskom-prefetch-map conf-no-or-stat membership))
        (lyskom-run-hook-with-args 'lyskom-add-membership-hook
                                   membership))
    (lyskom-insert-string 'conf-does-not-exist)))



;;; ================================================================
;;;     Uttr{d - Subtract yourself as a member from a conference
;;;     Uteslut medlem - Subtract somebody else as a member

;;; Author: David Byers
;;; Based on code by Inge Wallin


;; Subtract another person

(def-kom-command kom-sub-member ()
  "Remove a member from a conference. To do this you need to be the
supervisor of the conference or of the member being removed."
  (interactive)
  (lyskom-sub-member
   (lyskom-read-conf-stat (lyskom-get-string 'who-to-exclude)
                          '(pers) nil "" t)
   (lyskom-read-conf-stat (lyskom-get-string 'where-from-exclude) 
			  '(all) nil "" t)))


(def-kom-command kom-sub-self (&optional conf)
  "Resign your membership of a conference. If
`kom-unsubscribe-makes-passive' is set, them resigning once converts
your membership to a passive membership and resigning twice removes
the membership completely (if the server supports passive
memberships).

See `kom-unsubscribe-makes-passive'."
  (interactive)
  (lyskom-sub-member 
   (blocking-do 'get-conf-stat lyskom-pers-no)
   (if conf (blocking-do 'get-conf-stat conf)
     (lyskom-read-conf-stat (lyskom-get-string 'leave-what-conf)
                            '(all) nil 
                            (let ((ccn 
                                   (if (or (null lyskom-current-conf)
                                           (zerop lyskom-current-conf))
                                       ""
                                     (conf-stat->name
                                      (blocking-do 'get-conf-stat
                                                   lyskom-current-conf)))))
                              (if ccn
                                  (cons ccn 0)
                                "")) t))))

(defun lyskom-sub-member (pers conf)
  "Remove the person indicated by PERS as a member of CONF."
  (let* ((reply nil)
         (self (= (conf-stat->conf-no pers) lyskom-pers-no))
         (mship (and self 
                     kom-unsubscribe-makes-passive
                     (lyskom-get-membership (conf-stat->conf-no conf))))
         (passivate (and mship
                         (lyskom-have-call 102) ; set-membership-type
                         (not (membership-type->passive
                               (membership->type mship))))))

    (cond ((null pers) (lyskom-insert-string 'error-fetching-person))
	  ((null conf) (lyskom-insert-string 'error-fetching-conf))
          (passivate 
           (lyskom-prefetch-cancel-prefetch-map (conf-stat->conf-no conf))
           (lyskom-format-insert 'unsubscribe-to conf)
           (set-membership-type->passive (membership->type mship) t)
           (setq reply (blocking-do 'set-membership-type
                                    (conf-stat->conf-no pers)
                                    (conf-stat->conf-no conf)
                                    (membership->type mship)))
           (if (not reply)
               (lyskom-format-insert 'unsubscribe-failed
                                     (lyskom-get-string 'You)
                                     conf)
             (lyskom-insert-string 'done)
             (lyskom-format-insert 'passivate-done conf)
             (when (= (conf-stat->conf-no conf) lyskom-current-conf)
               (lyskom-leave-current-conf))
	     (read-list-delete-read-info (conf-stat->conf-no conf)
					 lyskom-to-do-list)))
	  (t
           (when self
             (lyskom-prefetch-cancel-prefetch-map (conf-stat->conf-no conf)))

	   (if self
	       (lyskom-format-insert 'unsubscribe-to conf)
	     (lyskom-format-insert 'exclude-from pers conf))

           (lyskom-ignoring-async (8 (conf-stat->conf-no conf))
             (setq reply (blocking-do 'sub-member
                                      (conf-stat->conf-no conf)
                                      (conf-stat->conf-no pers))))
	   (if self
	       (lyskom-remove-membership (conf-stat->conf-no conf)))
	   (if (not reply)
	       (lyskom-format-insert 'unsubscribe-failed
				     (if self
					 (lyskom-get-string 'You)
				       (conf-stat->name pers))
				     conf)
	     (lyskom-insert-string 'done)
	     (when (and self (= (conf-stat->conf-no conf)
                              lyskom-current-conf))
               (lyskom-leave-current-conf))
	     (read-list-delete-read-info (conf-stat->conf-no conf)
					 lyskom-to-do-list))))))
	   

	 

;;; ================================================================
;;;                 Skapa m|te - Create a conference

;;; Author: ???


(def-kom-command kom-create-conf (&optional name)
  "Create a new conference. Use this command when you want to create a
new conference. It will ask for all required information.

Before creating a conference, check that there isn't already one
covering the intended topics. There may be a conference for discussing
converence creation where you can ask. If there isn't, there is
probably a general Q&A conference where you can ask."
  (interactive)
  (let* ((conf-name (or name
			(lyskom-read-string
			 (lyskom-get-string 'name-of-conf))))
	 (open (j-or-n-p (lyskom-get-string 'anyone-member)))
	 (secret (if (not open)
		     (j-or-n-p (lyskom-get-string 'secret-conf))))