view-text.el 53.9 KB
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;;;;; -*-coding: raw-text;-*-
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;;;;;
;;;;; $Id$
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;;;;; Copyright (C) 1991-2002  Lysator Academic Computer Association.
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;;;;;
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;;;;; This file is part of the LysKOM Emacs LISP client.
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;;;;; 
;;;;; LysKOM is free software; you can redistribute it and/or modify it
;;;;; under the terms of the GNU General Public License as published by 
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;;;;; the Free Software Foundation; either version 2, or (at your option) 
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;;;;; any later version.
;;;;; 
;;;;; LysKOM is distributed in the hope that it will be useful, but WITHOUT
;;;;; ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
;;;;; FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
;;;;; for more details.
;;;;; 
;;;;; You should have received a copy of the GNU General Public License
;;;;; along with LysKOM; see the file COPYING.  If not, write to
;;;;; Lysator, c/o ISY, Linkoping University, S-581 83 Linkoping, SWEDEN,
;;;;; or the Free Software Foundation, Inc., 675 Mass Ave, Cambridge, 
;;;;; MA 02139, USA.
;;;;;
;;;;; Please mail bug reports to bug-lyskom@lysator.liu.se. 
;;;;;
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;;; ================================================================
;;; ================================================================
;;;
;;; File: view-text.el
;;; 
;;; This file contains functions that have to do with putting
;;; a text into the lyskom buffer.
;;;


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


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(defvar lyskom-view-text-text)
(defvar lyskom-view-text-text-stat)


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(defun lyskom-view-text (text-no &optional mark-as-read
				 follow-comments conf-stat priority
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				 build-review-tree filter-active
				 flat-review)
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  "Display text number TEXT-NO.
Args: TEXT-NO &optional MARK-AS-READ FOLLOW-COMMENTS CONF-STAT 
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PRIORITY BUILD-REVIEW-TREE FLAT-REVIEW.
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If MARK-AS-READ (or `kom-review-marks-texts-as-read') is non-nil the text will
be marked as read.
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If FOLLOW-COMMENTS is non-nil all comments and footnotes to this text will be
read before the next text. CONF-STAT must be the conference status of the
current conference, and PRIORITY the priority, if FOLLOW-COMMENTS is non-nil.
If BUILD-REVIEW-TREE is non-nil then it fixes a new entry in the 
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lyskom-reading-list to read the comments to this.
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If FLAT-REVIEW is non-nil this is a review caused by lyskom-view-commented or
kom-view-text viewing REVIEW or REVIEW-MARK text.
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Note that this function must not be called asynchronously."
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  (let ((inhibit-read-only t)
	(filter (and filter-active
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                     (lyskom-filter-text-p text-no)))
        (start nil)
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        (todo nil)
        (lyskom-last-text-format-flags nil))
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    (cond ((eq filter 'skip-text) (lyskom-filter-prompt text-no 'filter-text)
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	   (setq todo 'next-text)
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	   (lyskom-mark-as-read (blocking-do 'get-text-stat text-no))
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	   'next-text)
	  ((eq filter 'skip-tree)
	   (lyskom-filter-prompt text-no 'filter-tree)
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	   ;;(initiate-get-text-stat 'main 'lyskom-jump text-no t)
	   ;; Let's try something else:
	   (lyskom-jump (blocking-do 'get-text-stat text-no) t)
	   (lyskom-wait-queue 'main)

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	   (setq todo 'next-text)
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	   'next-text)
	  (t
	   (if (not (or (null filter) 
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                        (eq filter 'read)
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			(eq filter 'dontshow)))
	       (lyskom-message "%s" (lyskom-get-string 'invalid-filter-list)))
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	   (if (eq filter 'dontshow)
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	       (setq todo 'next-text))
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	   (blocking-do-multiple ((text-stat (get-text-stat text-no))
				  (text (get-text text-no)))
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             (setq lyskom-view-text-text text
                   lyskom-view-text-text-stat text-stat)
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	     (if (and text-stat text)
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		 (progn
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                   (run-hooks 'lyskom-view-text-hook)
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                   (run-hooks 'kom-view-text-hook)
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		   ;; Use a marker, because the buffer may lose data
		   ;; at the top if kom-max-buffer-size is set.
		   (setq start (point-max-marker))
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                   (let ((mx-date (car (lyskom-get-aux-item (text-stat->aux-items text-stat) 21)))
                         (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)))
                         (mx-to (lyskom-get-aux-item (text-stat->aux-items text-stat) 19))
                         (mx-cc (lyskom-get-aux-item (text-stat->aux-items text-stat) 20))
                         (mx-filename (lyskom-get-aux-item (text-stat->aux-items text-stat) 10104))
                         (mx-sender (lyskom-get-aux-item (text-stat->aux-items text-stat) 10103))
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			 (mx-headers (lyskom-get-aux-item (text-stat->aux-items text-stat) 24))
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                         (mx-reply-to (lyskom-get-aux-item (text-stat->aux-items text-stat) 18)))
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                   (lyskom-format-insert
                    'view-text-first-line
                    text-stat
                    (list 'lyskom-text-start (text-stat->text-no text-stat))
                    (if mx-date
                        (let ((date (lyskom-mx-date-to-time mx-date)))
                          (if date
                              (concat
                               (lyskom-format-time 'date-and-time date)
                               (if (time->tzhr date)
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                                   (lyskom-format " %#1s%#2s" 
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                                                  (time->tzhr date)
                                                  (time->tzmin date))
                                 ""))
                            (aux-item->data mx-date)))
                      (lyskom-format-time 'date-and-time
                                          (text-stat->creation-time text-stat)))
                    (text-stat->no-of-lines text-stat)
                    (or (lyskom-format-mx-author mx-from mx-author)
                        (lyskom-format "%#1P" 
                                       (text-stat->author text-stat)))
                    (when (eq filter 'dontshow)
                      (lyskom-get-string 'filtered))
                    (when kom-highlight-first-line
                      '(face kom-first-line-face)))
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		   (set-marker start nil)

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                   ;; Insert sender

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                   (when (and mx-sender kom-show-imported-envelope-sender)
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                     (lyskom-format-insert 'envelope-sender 
                                           (aux-item->data (car mx-sender))))
                   (when mx-filename
                     (lyskom-format-insert 'attachment-filename
                                           (aux-item->data (car mx-filename))))

                   ;; Insert imported at

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                   (cond ((and (or mx-from mx-author mx-sender mx-headers)
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                               (text-stat->author text-stat)
                               kom-show-imported-importer)
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                          (lyskom-format-insert 'text-imported-at-by
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                                                (lyskom-format-time
                                                 'date-and-time
                                                 (text-stat->creation-time text-stat))
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                                                (text-stat->author text-stat)))
                         (mx-from
                          (lyskom-format-insert 'text-imported-at
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                                                (lyskom-format-time
                                                 'date-and-time
                                                 (text-stat->creation-time text-stat))))
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                         (mx-date (lyskom-format-insert 'text-created-at
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                                                        (lyskom-format-time
                                                         'date-and-time
                                                         (text-stat->creation-time text-stat)))))
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                   (when kom-show-imported-external-recipients
                     (mapcar (lambda (el)
                               (lyskom-format-insert "%#1s: %#2s\n"
                                                     (lyskom-get-string 'mx-Recipient)
                                                     (aux-item->data el)))
                             mx-to)
                     (mapcar (lambda (el)
                               (lyskom-format-insert "%#1s: %#2s\n"
                                                     (lyskom-get-string 'mx-Extra-recipient)
                                                     (aux-item->data el)))
                             mx-cc)
                     (mapcar (lambda (el)
                               (lyskom-format-insert "%#1s: %#2s\n"
                                                     (lyskom-get-string 'mx-Extern-reply-to)
                                                     (aux-item->data el)))
                             mx-reply-to)
                     )
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                   ;; Insert all recipients and other header lines.
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		   (if (eq filter 'dontshow)
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		       (lyskom-mark-as-read
			(blocking-do 'get-text-stat text-no))
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		     (lyskom-traverse misc
			 (text-stat->misc-info-list text-stat)
		       (let ((type (misc-info->type misc)))
			 (cond
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			  ((memq type '(RECPT BCC-RECPT CC-RECPT))
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			   (lyskom-print-header-recpt 
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			    (misc-info->recipient-no misc)
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			    misc))
			  ((eq type 'COMM-IN)
			   (if kom-reading-puts-comments-in-pointers-last
			       nil
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                             (lyskom-print-header-comm 
                              (misc-info->comm-in misc)
                              misc
                              text-stat)))
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			  ((eq type 'FOOTN-IN)
			   (if kom-reading-puts-comments-in-pointers-last
			       nil
			     (lyskom-print-header-comm
			      (misc-info->footn-in misc)
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			      misc
                              text-stat)))
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			  ((eq type 'COMM-TO)
			   (lyskom-print-header-comm (misc-info->comm-to misc)
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						     misc
                                                     text-stat))
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			  ((eq type 'FOOTN-TO)
			   (lyskom-print-header-comm (misc-info->footn-to misc)
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						     misc
                                                     text-stat))
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			  )))
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                     ;; Insert aux-items that go in the header.
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                     (lyskom-traverse-aux aux (text-stat->aux-items text-stat)
                       (let ((tpw (lyskom-aux-item-definition-field aux 'text-print-when)))
                       (when (or (and (lyskom-viewing-noconversion) (not (eq tpw 'footer)))
                                 (eq tpw 'header)
                                 (and (eq tpw 'comment) (not kom-reading-puts-comments-in-pointers-last)))
                         (lyskom-insert
                          (or (lyskom-aux-item-call aux 'text-print aux text-stat)
                              (lyskom-format 'text-header-aux-item
                                             (lyskom-get-string
                                              (or (car (lyskom-aux-item-definition-field aux 'text-name))
                                                  'unknown-aux-item))
                                             (aux-item->tag aux)
                                             (aux-item->data aux)
                                             (lyskom-aux-item-terminating-button aux text-stat))))
                         (lyskom-insert "\n"))))
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                     ;; If the text is marked, insert line saying so.

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		     (let ((num-marks (text-stat->no-of-marks text-stat))
			   (is-marked-by-me (cache-text-is-marked
					     (text-stat->text-no text-stat))))
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		       (when (> num-marks 0)
			 (if is-marked-by-me
			     (if (= num-marks 1)
				 (lyskom-format-insert 'marked-by-you
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						       (mark->symbolic-mark-type
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							is-marked-by-me))
			       (lyskom-format-insert 'marked-by-you-and-others
						     (1- num-marks)
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						     (mark->symbolic-mark-type
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						      is-marked-by-me)))
			   (lyskom-format-insert 'marked-by-several num-marks))))

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                     ;; Insert the text body.

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		     (lyskom-print-text text-stat text
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					(or mark-as-read kom-review-marks-texts-as-read)
					text-no flat-review)
		     (if kom-review-marks-texts-as-read (lyskom-is-read text-no)))
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                   ;; Insert aux-items that go in the footer.

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                   (let ((text nil))
                       (lyskom-traverse-aux aux
                                            (text-stat->aux-items text-stat)
                         (when (and
                             (or (eq (lyskom-aux-item-definition-field aux
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                                                                 'text-print-when)
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                                     'footer)
                              (and (eq (lyskom-aux-item-definition-field aux
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                                                                  'text-print-when)
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                                       'comment)
                                   kom-reading-puts-comments-in-pointers-last
                               ))
                             (setq text 
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                                   (lyskom-aux-item-call 
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                                    aux
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                                    'text-print
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                                    aux
                                    text-stat)))
                           (lyskom-insert text)
                           (lyskom-insert "\n"))))

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                   ;; Insert fast replies.

                   (let ((author-fast-replies nil)
                         (other-fast-replies nil))
                     (lyskom-traverse-aux aux (text-stat->aux-items text-stat)
                      (when (eq (aux-item->tag aux) 2)
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                        (if (or (lyskom-viewing-noconversion)
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                                (not (eq (text-stat->author text-stat)
                                         (aux-item->creator aux))))
                            (setq other-fast-replies
                                  (cons aux other-fast-replies))
                          (setq author-fast-replies
                                (cons aux author-fast-replies)))))
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                     (when author-fast-replies
                       (lyskom-insert
                        (concat
                         (lyskom-format 'author-fast-replies)
                         "\n"
                         (mapconcat (lambda (item)
                                      (concat
                                       (lyskom-format 'author-fast-reply-aux
                                                      (aux-item->data item)
                                                      (aux-item->creator item))
                                       (lyskom-aux-item-terminating-button
                                        item
                                        text-stat)
                                       "\n"))
                                    (nreverse author-fast-replies)
                                    ""))))
                     (when other-fast-replies
                       (lyskom-insert
                        (concat
                         (lyskom-format 'other-fast-replies)
                         "\n"
                         (mapconcat (lambda (item)
                                      (concat
                                       (lyskom-format 'other-fast-reply-aux
                                                      (aux-item->data item)
                                                      (aux-item->creator item))
                                       (lyskom-aux-item-terminating-button
                                        item
                                        text-stat)
                                       "\n"))
                                    (nreverse other-fast-replies)
                                    "")))))

                   ;; Insert footnote/comment references.
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		   (if kom-reading-puts-comments-in-pointers-last
		       (lyskom-view-text-handle-saved-comments text-stat))
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                   ;; Prefetch commented texts.

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		   (if (or follow-comments
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			   ;; Checking build-review-tree should not be
			   ;; necessary, really /davidk
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			   build-review-tree)
		       ;; This shows footnotes also.
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		       (progn
			 ;; this is a bit silly, as it prefetches all
			 ;; the texts many times.
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                         (unless (and build-review-tree
                                      kom-review-uses-cache)
                           (lyskom-prefetch-texttree text-no))
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			 (lyskom-follow-comments text-stat
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						 conf-stat
						 (or mark-as-read kom-review-marks-texts-as-read)
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						 priority build-review-tree)))
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                   (if (lyskom-text-p (cache-get-text text-no))
                       (cache-del-text text-no))
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		   ))
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	       (lyskom-format-insert 'no-such-text-no text-no))
             (let ((aux-items (text-stat->aux-items text-stat)))
               (while aux-items
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                 (lyskom-aux-item-call (car aux-items)
                                       'read-action
                                       text-stat)
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                 (setq aux-items (cdr aux-items))))
             )))
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    todo))
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(defun lyskom-text-is-mail-p (text-stat)
  "Ad-hoc test to determine whether a text is a mail by peeking at aux-items."
  (lyskom-match-aux-items
   (text-stat->aux-items text-stat)
   (lambda (aux-item)
     (let ((tag (aux-item->tag aux-item)))
       (or (and (> tag 15)	; 16:mx-author,	17:mx-from,	18:mx-reply-to,
		(< tag 22))	; 19:mx-to,	20:mx-cc,	21:mx-date,
	   (= 24 tag))))))	; 24:mx-headers

(defun lyskom-filter-signature-hook ()
  "Filter out the signature of imported mail messages. Most useful
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when put in your `kom-view-text-hook'."
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  (unless (lyskom-viewing-noconversion)
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    (when (lyskom-text-is-mail-p lyskom-view-text-text-stat)
      (let* ((body (text->text-mass lyskom-view-text-text))
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	     (sign (string-match "^-- $" body)))
	(when sign
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	  (set-text->text-mass lyskom-view-text-text (substring body 0 sign))
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	  (lyskom-signal-reformatted-text 'reformat-signature))))))

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;(add-hook 'kom-view-text-hook 'lyskom-filter-signature-hook)
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(defun lyskom-view-text-convert-ISO-646-SE-to-ISO-8859-1 ()
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  "Display r{ksm|rg}s as räksmörgås unless the text is an imported mail
or we are reviewing without conversion. In other words, the characters
][\\}{| are converted, however ^~@` are not. Yet another useful function
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to put in your `kom-view-text-hook'."
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  ;; First the hard part - should we patch the text
  ;; in the text object?
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  (unless (or (lyskom-viewing-noconversion)
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	      (lyskom-text-is-mail-p lyskom-view-text-text-stat))
    ;; Yes, modify the text from the text-object (stored in mod)
    (let* ((mod (aref (cdr lyskom-view-text-text) 1))
	   (brk (string-match "\n" mod))
	   (sbj (if brk (substring mod 0 brk) mod))
	   (txt (if brk (substring mod (1+ brk)) ""))
	   (tbl '((?\] . ?\305)          ; Å
		  (?\[ . ?\304)          ; Ä
		  (?\\ . ?\326)          ; Ö
		  (?\} . ?\345)          ; å
		  (?\{ . ?\344)          ; ä
		  (?\| . ?\366))))       ; ö
      (when (and (not (string-match "[\200-\377]" txt))
		 (or (string-match "[A-Za-z][][\\}{|]" txt)
		     (string-match "[][\\}{|][A-Za-z]" txt)
		     (string-match "[A-Za-z] +[][\\}{|]" txt)))
	(lyskom-signal-reformatted-text 'reformat-deswascii)
	(while (string-match "\\([][\\}{|]\\)" txt)
	  (let ((old-char (aref (match-string 1 txt) 0)))
	    (aset txt (match-beginning 1) (cdr (assoc old-char tbl)))))
	(aset (cdr lyskom-view-text-text) 1
	      (if brk (concat sbj "\n" txt) sbj))))))
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;(add-hook 'kom-view-text-hook 'lyskom-view-text-convert-ISO-646-SE-to-ISO-8859-1)
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(defun lyskom-follow-comments (text-stat conf-stat
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					 mark-as-read priority review-tree)
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  "Arrange so that all comments and footnotes to this text will be read.
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This will essentially fix the reading list and issue calls for the cache to be
filled.

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Arguments are: TEXT-STAT CONF-STAT MARK-AS-READ PRIORITY REVIEW-TREE
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TEXT-STAT is the current text.
CONF-STAT the current conference
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If MARK-AS-READ is non-nil the texts will be marked as read.
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PRIORITY the priority of the reading.
If REVIEW-TREE is non-nil then build an entry of type 'REVIEW-TREE in the 
lyskom-reading-list."
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  ;; . Find footnotes and show them.
  ;; . Fix the reading-list
  ;; . Issue cache-filling initiate-calls for everything left comments.
  
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  (let ((flist nil)
        (clist nil)
        (mx-attachments-in (lyskom-get-text-attachments text-stat)))
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    (lyskom-traverse misc (text-stat->misc-info-list text-stat)
      (cond
       ((and (eq (misc-info->type misc) 'FOOTN-IN)
	     (> (misc-info->footn-in misc) (text-stat->text-no text-stat))
	     kom-show-footnotes-immediately)
	;; Show the footnote
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	(lyskom-view-text (misc-info->footn-in misc)
			  mark-as-read t conf-stat priority review-tree)
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	(lyskom-is-read (misc-info->footn-in misc)))
       ((eq (misc-info->type misc) 'FOOTN-IN)
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	(setq flist (cons (misc-info->footn-in misc) flist)))
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       ((eq (misc-info->type misc) 'COMM-IN)
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        (setq clist (cons (misc-info->comm-in misc) clist)))))
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    (let (comments footnotes)
      ;; Find the comments that we should read and enter them into the
      ;; read-list.
      (lyskom-traverse no clist
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        (cond ((or review-tree
                   kom-follow-attachments
                   (not (memq no mx-attachments-in)))
               (let ((text-stat (blocking-do 'get-text-stat no)))
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                 (if (and text-stat
                          (or review-tree
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                              (not (lyskom-text-read-p text-stat))))
                     (setq comments (cons no comments)))))
              ((memq no mx-attachments-in)
               (lyskom-skip-attachments no mark-as-read))))
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      (if comments
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          (if review-tree
              (lyskom-review-enter-read-info
               (lyskom-create-read-info 'REVIEW-TREE
                                        conf-stat priority
                                        (lyskom-create-text-list comments)
                                        (text-stat->text-no text-stat)) t)
            (read-list-enter-read-info
             (lyskom-create-read-info 'COMM-IN
                                      conf-stat priority
                                      (lyskom-create-text-list comments)
                                      (text-stat->text-no text-stat))
             lyskom-reading-list t)))

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      ;; Find the footnotes that we should read and enter them into
      ;; the read-list. A slight trick is to increase the priority so
      ;; that they will be read first.
      (lyskom-traverse no flist
	(let ((text-stat (blocking-do 'get-text-stat no)))
	  (if (or review-tree
		  (and text-stat
		       (not (lyskom-text-read-p text-stat))))
	      (setq footnotes (cons no footnotes)))))
      (if footnotes
	  (read-list-enter-read-info
	   (lyskom-create-read-info (if review-tree 'REVIEW-TREE 'FOOTN-IN)
				    conf-stat (1+ priority)
				    (lyskom-create-text-list footnotes)
				    (text-stat->text-no text-stat))
	   lyskom-reading-list t)))))
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(defun lyskom-get-text-attachments (text-stat)
  "Return a list of all attachments to TEXT-STAT."
  (mapcar
   (lambda (el)
     (string-to-number (aux-item->data el)))
   (lyskom-get-aux-item (text-stat->aux-items text-stat) 10101)))

(defun lyskom-skip-attachments (text-no mark-as-read)
  "Skip the hierarchy of attachments starting at text-no"
  (let ((queue (list text-no))
        (done nil)
        (tmp (make-collector))
        (result nil))
    ;; Note: this does block the client, but explicitly checks that
    ;;       it is not being called from under the parser (where it
    ;;       really doesn't make a whole lot of sense anyway), so
    ;;       we ought to be OK anyway.
    (unless lyskom-is-parsing
      (while queue
        (while queue
          (when (not (memq (car queue) done))
            (initiate-get-text-stat 'background
                                    'collector-push
                                    (car queue) 
                                    tmp)
            (setq queue (cdr queue))
            (setq done (cons (car queue) done))))
        (lyskom-wait-queue 'background)

        (setq result (nconc result (collector->value tmp)))
        (lyskom-traverse text-stat (collector->value tmp)
          (setq queue (nconc queue (lyskom-get-text-attachments text-stat)))))

      (lyskom-traverse text-stat result
        (read-list-delete-text (text-stat->text-no text-stat) lyskom-reading-list)
        (read-list-delete-text (text-stat->text-no text-stat) lyskom-to-do-list)
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        (when mark-as-read
          (lyskom-mark-as-read text-stat)
          (lyskom-is-read-handler text-stat))))))
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(defun lyskom-fetch-text-for-cache (text-stat)
  "Fetches the author and other things of a text and does nothing with it."
  (cond
   (text-stat
    (lyskom-fetch-author-for-cache text-stat)
    (initiate-get-text 'fill-cache nil (text-stat->text-no text-stat))
    (lyskom-traverse misc (text-stat->misc-info-list text-stat)
      (cond
       ((eq (misc-info->type misc) 'FOOTN-IN)
	(initiate-get-text-stat 'fill-cache 'lyskom-fetch-author-for-cache
				(misc-info->footn-in misc)))
       ((eq (misc-info->type misc) 'FOOTN-TO)
	(initiate-get-text-stat 'fill-cache 'lyskom-fetch-author-for-cache
				(misc-info->footn-to misc)))
       ((eq (misc-info->type misc) 'COMM-IN)
	(initiate-get-text-stat 'fill-cache 'lyskom-fetch-author-for-cache
				(misc-info->comm-in misc)))
       ((eq (misc-info->type misc) 'COMM-TO)
	(initiate-get-text-stat 'fill-cache 'lyskom-fetch-author-for-cache
				(misc-info->comm-to misc))))))))
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(defun lyskom-fetch-author-for-cache (text-stat)
  "Fetches the author of a text and does nothing with it."
  (if text-stat				;Error check.
      (initiate-get-conf-stat 'fill-cache nil (text-stat->author text-stat))))

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(defun lyskom-text-read-p (text-stat)
  "Return t if TEXT-STAT has been marked as read in all
recipients to it that the user is a member in."
  (let* ((misc-info-list (text-stat->misc-info-list text-stat))
	 (i (length misc-info-list))
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	 (res 'not-member))
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    (while (and res (not (zerop i)))
      (setq i (1- i))
      (let* ((misc-info (elt misc-info-list i))
	     (type (misc-info->type misc-info)))
	(cond
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	 ((memq type '(RECPT BCC-RECPT CC-RECPT))
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	  ;; Is this function ever called asynchronously? If not, we
	  ;; can use lyskom-get-membership istead.
	  (let ((membership (lyskom-try-get-membership
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			     (misc-info->recipient-no misc-info) t))
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		(loc-no (misc-info->local-no misc-info)))
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	    ;; Make a note that this text really is in a group we are
	    ;; a member of.
	    (if (and res membership) (setq res t))
	    
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	    (if (and membership
		     (> loc-no (membership->last-text-read membership))
		     (not (lyskom-vmemq loc-no
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					(membership->read-texts membership))))
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		(setq res nil)))))))
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    (if (eq res 'not-member)
	(not kom-follow-comments-outside-membership)
      res)))
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(defun lyskom-text-read-at-least-once-p (text-stat &optional bg)
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  "Return t if TEXT-STAT has been marked as read in any of the recipients
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the user is a member of. Uses blocking-do. Returns t if TEXT-STAT is nil.

If BG is non-nil, this function is run in the background and must not use
blocking-do."
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  (if text-stat
      (let* ((misc-info-list (text-stat->misc-info-list text-stat))
             (misc-item nil)
             (type nil)
             (membership nil)
             (is-member nil)
             (result nil))
        (while misc-info-list
          (setq misc-item (car misc-info-list))
          (setq type (misc-info->type misc-item))
          (setq misc-info-list (cdr misc-info-list))
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          (cond ((memq type '(RECPT BCC-RECPT CC-RECPT))
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                 (setq membership (if bg
                                      (lyskom-try-get-membership
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                                       (misc-info->recipient-no misc-item) t)
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                                    (lyskom-get-membership
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                                     (misc-info->recipient-no misc-item) t)))
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                 (when membership
                   (setq is-member t)
                   (when (or (<= (misc-info->local-no misc-item)
                                 (membership->last-text-read membership))
                             (lyskom-vmemq (misc-info->local-no misc-item)
                                           (membership->read-texts
                                            membership)))
                     (setq result t)
                     (setq misc-info-list nil))))))
        (cond (result result)
              ((not is-member) (not kom-follow-comments-outside-membership))
              (t nil)))
    t))


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(defun lyskom-subtract-one-day (x)
  (let ((high-x (1- (car x)))
        (low-x (car (cdr x))))
    (if (> 20864 low-x)
        (setq high-x (1- high-x)
              low-x (+ low-x 65536)))
    (setq low-x (- low-x 20864))
    (list high-x low-x nil)))

(defun lyskom-calculate-day-diff (time)
  (let* ((now (current-time))
         (yesterday (lyskom-subtract-one-day now))
         (decnow (decode-time now))
         (decthen (decode-time yesterday)))
    (cond ((and (= (time->mday time) (elt decnow 3))
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                (= (time->mon time)  (elt decnow 4))
                (= (time->year time) (elt decnow 5)))
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           'today)
          ((and (= (time->mday time) (elt decthen 3))
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                (= (time->mon time)  (elt decthen 4))
                (= (time->year time) (elt decthen 5)))
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           'yesterday)
          (t nil))))

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(defun lyskom-format-text-footer (text author author-name format format-flags)
  "Format the footer of a text."
  (let* ((result "")
         (start 0)
         (format-letter nil)
         (field-width nil)
         (kom-deferred-printing nil)
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         (author-name-len nil)
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         (have-author (and format (string-match "%=?[0-9]*P" format))))

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    (setq author-name-len (lyskom-string-width (or author-name (conf-stat->name author))))
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    ;; No user-specified format, so output dashes and stuff

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    (if (null format)
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        (let* ((format-flag-string
                (if (and format-flags (listp format-flags))
                    (let ((first-flag t))
                      (concat
                       "("
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                       (mapconcat 
                        (lambda (str)
                          (let ((face nil))
                            ;; If it's a cons, the cdr is property list
                            (when (consp str)
                              (setq face (cdr str)
                                    str (car str)))
                            ;; Get the string
                            (setq str (lyskom-get-string str))
                            ;; Upcase the first in the list
                            (when first-flag 
                              (setq first-flag nil str (upcase-initials str)))
                            ;; If we have a plist, apply it
                            (when face
                              (add-text-properties 0 (length str) face str))
                            ;; Return the string
                            str))
                        format-flags ", ")
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                       ")"))
                  ""))
               (end-dash-chars
                (- kom-text-footer-dash-length
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                   (lyskom-string-width (int-to-string (text-stat->text-no text))) 
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                   3                             ; Parens and space
                   (if kom-show-author-at-end
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                       (+ author-name-len 2) 
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                     0)
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                   (string-width format-flag-string)))
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               (end-dash (if (> end-dash-chars 0)
                             (make-string end-dash-chars ?-)
                           "")))
          (lyskom-format
           (cond ((and kom-dashed-lines kom-show-author-at-end)
                  "(%#1n) /%#2P/%#3s%#4s")
                 (kom-dashed-lines
                  "(%#1n) %#3s%#4s")
                 (kom-show-author-at-end
                  "(%#1n) /%#2P/")
                 (t
                  "(%#1n)"))
           text
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           (or author-name author)
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           end-dash
           format-flag-string))
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      ;; User-specified format. Do all kinds of weird stuff

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      (while (string-match "%\\(=?-?[0-9]+\\)?\\([-nPpf% ]\\)" format start)
        (setq result (concat result (substring format start 
                                               (match-beginning 0))))
        (setq format-letter (aref format (match-beginning 2)))
        (setq field-width (match-string 1 format))
        (when (null field-width) (setq field-width ""))
        (setq start (match-end 0))
        (setq result
              (concat 
               result
               (cond
                ((eq format-letter ?p)
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                 (lyskom-format (format "%%%s#1p" field-width) 
                                (or author (text-stat->author text))))
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                ((eq format-letter ?P)
                 (lyskom-format (format "%%%s#1P" field-width) 
                                (or author author-name)))

                ((eq format-letter ?n)
                 (lyskom-format (format "%%%s#1n" field-width) 
                                (text-stat->text-no text)))

                ((eq format-letter ?f)
                 (if format-flags
                     (lyskom-format (format "%%%s#1s" field-width) 
                                    (lyskom-get-string format-flags))
                   ""))

                ((eq format-letter ?-)
                 (let ((width 
                        (cond ((null field-width) 42)
                              ((string= "" field-width) 42)
                              ((eq ?= (aref field-width 0))
                               (string-to-int (substring field-width 1)))
                              (t (string-to-int field-width)))))
                 
                   (lyskom-format 
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                    "%#1s"
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                    (if have-author
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                        (if (< author-name-len width)
                            (make-string (- width author-name-len) ?-)
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                          "")
                      (make-string width ?-)))))

                ((eq format-letter ?%)
                 "%")
                (t (concat "%" field-width (make-string 1 format-letter))))))
        )
      (setq result (concat result (substring format start)))
      (if (string-match "[ \t]+\\'" result)
          (substring result 0 (match-beginning 0))
        result))))



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(defun lyskom-deferred-insert-footer (conf-stat defer-info)
  "Insert the name of a conference at a previously reserved place."
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  (let* ((text-stat (elt (defer-info->data defer-info) 0))
         (format-flags (elt (defer-info->data defer-info) 1))
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         (mx-from (car (lyskom-get-aux-item (text-stat->aux-items text-stat) 17)))
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         (mx-author (car (lyskom-get-aux-item (text-stat->aux-items text-stat) 16)))
         (name (cond (conf-stat nil)
                      ((= (defer-info->call-par defer-info) 0)
                       (lyskom-get-string 'person-is-anonymous))
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                      (t (lyskom-format 'person-does-not-exist
                                        (text-stat->author text-stat))))))
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    (setq name (or (lyskom-format-mx-author mx-from mx-author) name))

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    (lyskom-replace-deferred defer-info 
                             (lyskom-format-text-footer text-stat
                                                        conf-stat
                                                        name
                                                        kom-text-footer-format
                                                        format-flags))))
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(defun lyskom-print-text (text-stat text mark-as-read text-no flat-review)
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  "Print a text. The header must already be printed.
Print an error message if TEXT-STAT or TEXT is nil.
Mark the text as read if (and only if) MARK-AS-READ is non-nil.
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Args: TEXT-STAT TEXT MARK-AS-READ TEXT-NO FLAT-REVIEW."
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  (let ((lyskom-current-function 'lyskom-print-text))
    (cond
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     ((or (null text)
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          (null text-stat))
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      (lyskom-format-insert 'no-such-text-no text-no)
      (setq lyskom-previous-text lyskom-current-text)
      (setq lyskom-current-text text-no))
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     (t
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      (when (eq (text-stat->author text-stat) lyskom-pers-no)
        (setq lyskom-last-seen-written (text-stat->text-no text-stat)))
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      (let* ((str (text->decoded-text-mass text text-stat))
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	     (truncated nil)
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             ;; s1 s2 t1 t2
	     body)
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        (cond
         ((string-match "\n" str)
          (setq lyskom-current-subject (substring str 0 (match-beginning 0)))
          (setq body (substring str (match-end 0)))
          (lyskom-insert-string 'head-Subject)
          (let ((lyskom-current-function-phase 'subject))
            (lyskom-format-insert "%#1r\n" 
                                  (copy-sequence lyskom-current-subject)))
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            (lyskom-format-insert 
             "%#2$%#1s\n"
             (if kom-dashed-lines
                 (make-string kom-text-header-dash-length ?-)
               "")
             (when kom-highlight-dashed-lines
               '(face kom-dashed-lines-face)))
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          ;; (setq t1 (point-max))
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	  ;; Truncate body if flat-review and long text
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	  (when (and flat-review
                     (numberp kom-truncate-show-lines)
                     (numberp kom-truncate-threshold))
            (let* ((truncated-body
                    (lyskom-truncate-to-lines body
                                              kom-truncate-threshold
                                              (min kom-truncate-show-lines
                                                   kom-truncate-threshold))))
              (unless (eq truncated-body body)
                (setq body truncated-body
                      truncated t))))
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          (let ((lyskom-current-function-phase 'body))
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            (lyskom-format-insert "%#2$%#1t\n" 
                                  (cons text-stat body)
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                                  (and kom-highlight-text-body
                                       '(face kom-text-body-face)))
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            )
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	  ;; Indicate that the text was truncated
	  (if truncated
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              (lyskom-signal-reformatted-text
               '(reformat-truncated . (face kom-warning-face))))

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          ;; (setq t2 (point-max))
	  )
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         (t                             ;No \n found. Don't print header.
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          (lyskom-format-insert 
           "%#2$%#1s\n"
           (if kom-dashed-lines
               (make-string kom-text-header-dash-length ?-)
             "")
           (when kom-highlight-dashed-lines
             '(face kom-dashed-lines-face)))
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          (lyskom-format-insert "%#2$%#1t\n"
                                (cons text-stat str)
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                                (and kom-highlight-text-body
                                       '(face kom-text-body-face)))
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          (setq lyskom-current-subject "")))
        (sit-for 0)
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        (let* ((lyskom-current-function-phase 'footer)
               (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)))
               (author-name (lyskom-format-mx-author mx-from mx-author)))

          (if (and kom-deferred-printing
                   (or kom-text-footer-format
                       kom-show-author-at-end))
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              (progn
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                (lyskom-format-insert "%#2$%#1s\n"
                                      lyskom-defer-indicator
                                      (when kom-highlight-dashed-lines
                                        '(face kom-dashed-lines-face)))
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                (lyskom-defer-insertion
                 (lyskom-create-defer-info
                  'get-conf-stat
                  (text-stat->author text-stat)
                  'lyskom-deferred-insert-footer
                  (set-marker (make-marker)
                              (- (point-max) 
                                 (length lyskom-defer-indicator)
                                 1))
                  (length lyskom-defer-indicator)
                  "%#1s"
                  (list text-stat lyskom-last-text-format-flags))))
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            (let* ((conf-stat (and (or kom-text-footer-format
                                       kom-show-author-at-end)
                                   (not (eq 0 (text-stat->author text-stat)))
                                   (blocking-do 'get-conf-stat 
                                                (text-stat->author text-stat)))))
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              (lyskom-format-insert
               "%#2$%#1s\n"
               (lyskom-format-text-footer 
                text-stat
                conf-stat
                (cond (author-name author-name)
                      ((eq (text-stat->author text-stat) 0)
                       (lyskom-get-string 'person-is-anonymous))
                      (conf-stat (conf-stat->name conf-stat))
                      (t (lyskom-format 'person-does-not-exist 
                                        (text-stat->author text-stat))))
                kom-text-footer-format
                lyskom-last-text-format-flags)
               (when kom-highlight-dashed-lines
                 '(face kom-dashed-lines-face))))))
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        (if mark-as-read
            (lyskom-mark-as-read text-stat))
        (setq lyskom-previous-text lyskom-current-text)
        (setq lyskom-current-text (text-stat->text-no text-stat)))))))
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(defun lyskom-mark-as-read (text-stat)
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  "Mark a text as read in all conferences that are recipients.
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Tell the server that it is read.

Args: TEXT-STAT

This function does not remove the text from the internal structures of
the client. That is done by lyskom-is-read."
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  (let ((misc-info-list (text-stat->misc-info-list text-stat)))
    (lyskom-traverse
     misc-info misc-info-list
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     (if (and (memq (misc-info->type misc-info) '(RECPT BCC-RECPT CC-RECPT))
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	      ;; The whole membership list might not be fetched
	      ;; yet. So we better mark it as read in all conferences.
	      ;; (lyskom-member-p (misc-info->recipient-no misc-info))
	      )
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	 (initiate-mark-as-read 'background 
                                'lyskom-mark-as-read-callback
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				(misc-info->recipient-no misc-info)
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				(list (misc-info->local-no misc-info))
                                text-stat
                                (misc-info->recipient-no misc-info)
                                (list (misc-info->local-no misc-info)))))))

(defun lyskom-mark-as-read-callback (result text-stat recipient local-nos)
  (lp--maybe-update-unreads recipient))
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(defun lyskom-print-header-recpt (conf-no misc)
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  "Print a line of info about a recipient (or cc-recipient) of a text."
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  (lyskom-format-insert "%#1s: %#2M <%#3d>\n"
			(cond ((eq (misc-info->type misc) 'RECPT)
			       (lyskom-get-string 'Recipient))
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                              ((eq (misc-info->type misc) 'BCC-RECPT)
                               (lyskom-get-string 'Hidden-recipient))
                              ((eq (misc-info->type misc) 'CC-RECPT)
                               (lyskom-get-string 'Extra-recipient))
                              (t (lyskom-get-string 'Strange-recipient)))
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			conf-no
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			(misc-info->local-no misc))
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  (if (misc-info->sent-at misc)
      (lyskom-format-insert 'send-at
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			    (lyskom-format-time
                             'date-and-time
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			     (misc-info->sent-at misc))))
  (if (misc-info->sender misc)
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      (lyskom-format-insert 'sent-by (misc-info->sender misc)))
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  (if (misc-info->rec-time misc)
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      (lyskom-format-insert
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       'received-at
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       (lyskom-format-time 'date-and-time (misc-info->rec-time misc)))))
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(defun lyskom-view-text-handle-saved-comments (text-stat)
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  "Ask server for what is needed to print the references to commenting texts 
and prints the references. Used at the bottom of the text.
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Args: TEXT-STAT of the text being read."
  (lyskom-traverse misc
      (text-stat->misc-info-list text-stat)
    (let ((type (misc-info->type misc)))
      (cond
       ((eq type 'COMM-IN)
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        (lyskom-print-header-comm (misc-info->comm-in misc) misc text-stat))
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       ((eq type 'FOOTN-IN)
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	(lyskom-print-header-comm (misc-info->footn-in misc) misc text-stat))))))
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(defun lyskom-print-header-comm (text misc read-text-stat)
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  "Get author of TEXT-NO and print a header line."
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  (let ((text-stat (if kom-deferred-printing
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		       (cache-get-text-stat text)
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		     (blocking-do 'get-text-stat text))))
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    ;; Print information about the link
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    (cond (text-stat
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           (lyskom-insert-header-comm text-stat misc read-text-stat))
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          ((not kom-deferred-printing) 
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           (lyskom-insert-header-comm text-stat misc read-text-stat))
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          (t
           (let ((defer-info (lyskom-create-defer-info
                              'get-text-stat
                              text
                              'lyskom-insert-deferred-header-comm
                              (point-max-marker)
                              (length lyskom-defer-indicator)
                              nil       ; Filled in later
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                              (list misc read-text-stat))))
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             (lyskom-format-insert "%#1s\n" lyskom-defer-indicator)
             (lyskom-defer-insertion defer-info))))
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    ;; Print information about who added the link
    (if (misc-info->sent-at misc)
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	(lyskom-format-insert 'send-at (lyskom-format-time
                                        'date-and-time
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					(misc-info->sent-at misc))))
    (if (misc-info->sender misc)
	(lyskom-format-insert 'sent-by (misc-info->sender misc)))))
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(defun lyskom-insert-deferred-header-comm (text-stat defer-info)
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  (let* ((author (if text-stat (text-stat->author text-stat) nil))
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	 (misc (elt (defer-info->data defer-info) 0))
	 (read-text-stat (elt (defer-info->data defer-info) 1))
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	 (type (misc-info->type misc))
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         (mx-from (car (lyskom-get-aux-item (text-stat->aux-items text-stat)
                                            17)))
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         (read-mx-from (car (lyskom-get-aux-item (text-stat->aux-items read-text-stat)
                                                 17)))
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         (mx-author (car (lyskom-get-aux-item (text-stat->aux-items text-stat)
                                              16)))
         (mx-attachments-in (lyskom-get-text-attachments read-text-stat))
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         (mx-belongs-to (mapcar
                         (lambda (el)
                           (string-to-number (aux-item->data el)))
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                         (lyskom-get-aux-item (text-stat->aux-items 
                                               read-text-stat) 10100)))
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         (content-type "")
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         (read-content-type "")
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	 fmt data)
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    (setq author (or (lyskom-format-mx-author mx-from mx-author) author))
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    ;; Extract the 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 ""))
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    (if (and read-mx-from
             (setq read-content-type
                   (car (lyskom-get-aux-item (text-stat->aux-items 
                                              read-text-stat) 1))))
        (progn (string-match "^\\(\\S-+\\)" (aux-item->data read-content-type))
               (setq read-content-type (format "(%s) "
                                          (aux-item->data read-content-type))))
      (setq read-content-type ""))
    
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    (cond
     ((eq type 'COMM-TO)
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      (setq fmt (cond ((memq (misc-info->comm-to misc) mx-belongs-to)
                       'attachment-to-text)
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                      (author 'comment-to-text-by)
                      (t 'comment-to-text))
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            content-type read-content-type
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	    data (misc-info->comm-to misc)))
     ((eq type 'FOOTN-TO)
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      (setq fmt (cond ((memq (misc-info->footn-to misc) mx-belongs-to)
                       'attachment-to-text)
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                      (author 'footnote-to-text-by)
                      (t 'footnote-to-text))
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            content-type read-content-type
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	    data (misc-info->footn-to misc)))
     ((eq type 'COMM-IN)
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      (setq fmt (cond ((memq (misc-info->comm-in misc) mx-attachments-in) 
                       'attachment-in-text)
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                      (author 'comment-in-text-by)
                      (t 'comment-in-text))
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	    data (misc-info->comm-in misc)))
     ((eq type 'FOOTN-IN)
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      (setq fmt (cond ((memq (misc-info->footn-in misc) mx-attachments-in)
                       'attachment-in-text)
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                      (author 'footnote-in-text-by)
                      (t 'footnote-in-text))
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	    data (misc-info->footn-in misc)))) 
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    (set-defer-info->format defer-info fmt)
    ; Note: author is ignored if fmt is not *-by
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    (lyskom-replace-deferred defer-info data author content-type)))
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(defun lyskom-insert-header-comm (text-stat misc read-text-stat)
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  "Get author of TEXT-NO and print a header line."
  ;;+++ error kommer att se annorlunda ut.
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  (let ((author (if text-stat
		    (text-stat->author text-stat)
		  nil))
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        (mx-from (car (lyskom-get-aux-item (text-stat->aux-items text-stat) 17)))
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        (read-mx-from (car (lyskom-get-aux-item (text-stat->aux-items read-text-stat) 17)))
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        (mx-author (car (lyskom-get-aux-item (text-stat->aux-items text-stat) 16)))
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        (mx-attachments-in (lyskom-get-text-attachments read-text-stat))
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        (mx-belongs-to (mapcar
                        (lambda (el)
                          (string-to-number (aux-item->data el)))
                        (lyskom-get-aux-item (text-stat->aux-items read-text-stat) 10100)))
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        (content-type "")
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        (read-content-type "")
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        (is-attachment nil)
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        (type (misc-info->type misc)))

    (setq author (or (lyskom-format-mx-author mx-from mx-author) author))
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    ;; Extract the 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 ""))

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    (if (and read-mx-from
             (setq read-content-type
                   (car (lyskom-get-aux-item (text-stat->aux-items 
                                              read-text-stat) 1))))
        (progn (string-match "^\\(\\S-+\\)" (aux-item->data read-content-type))
               (setq read-content-type (format "(%s) "
                                          (aux-item->data read-content-type))))
      (setq read-content-type ""))

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    (cond
     ((eq type 'COMM-TO)
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      (lyskom-format-insert (if (and (memq (misc-info->comm-to misc) mx-belongs-to)
                                     (setq is-attachment t))
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                                'attachment-to-text
                              'comment-to-text)
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                            (misc-info->comm-to misc)
                            nil
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                            read-content-type))
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     ((eq type 'FOOTN-TO)
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      (lyskom-format-insert (if (and (memq (misc-info->footn-to misc) mx-belongs-to)
                                     (setq is-attachment t