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+;;; gnus-gl.el --- an interface to GroupLens for Gnus
+;; Copyright (C) 1995,96 Free Software Foundation, Inc.
+
+;; Author: Brad Miller <bmiller@cs.umn.edu>
+;; Keywords: news, score
+
+;; This file is part of GNU Emacs.
+
+;; GNU Emacs 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.
+
+;; GNU Emacs 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 GNU Emacs; see the file COPYING.  If not, write to the
+;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+;; Boston, MA 02111-1307, USA.
+
+;;; Commentary:
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;; GroupLens software and documentation is copyright (c) 1995 by Paul
+;; Resnick (Massachusetts Institute of Technology); Brad Miller, John
+;; Riedl, Jon Herlocker, and Joseph Konstan (University of Minnesota),
+;; and David Maltz (Carnegie-Mellon University).
+;;
+;; Permission to use, copy, modify, and distribute this documentation
+;; for non-commercial and commercial purposes without fee is hereby
+;; granted provided that this copyright notice and permission notice
+;; appears in all copies and that the names of the individuals and
+;; institutions holding this copyright are not used in advertising or
+;; publicity pertaining to this software without specific, written
+;; prior permission.  The copyright holders make no representations
+;; about the suitability of this software and documentation for any
+;; purpose.  It is provided ``as is'' without express or implied
+;; warranty.
+;;
+;; The copyright holders request that they be notified of
+;; modifications of this code.  Please send electronic mail to
+;; grouplens@cs.umn.edu for more information or to announce derived
+;; works.  
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;; Author: Brad Miller
+;;
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;;
+;; User Documentation:
+;; To use GroupLens you must load this file.
+;; You must also register a pseudonym with the Better Bit Bureau.
+;; http://www.cs.umn.edu/Research/GroupLens
+;;
+;;    ---------------- For your .emacs or .gnus file ----------------
+;;
+;; As of version 2.5, grouplens now works as a minor mode of 
+;; gnus-summary-mode.  To get make that work you just need a couple of
+;; hooks.
+;; (setq gnus-use-grouplens t)
+;; (setq grouplens-pseudonym "")
+;; (setq grouplens-bbb-host "grouplens.cs.umn.edu")
+;;
+;; (setq gnus-summary-default-score 0)
+;;
+;;                              USING GROUPLENS
+;; How do I Rate an article??
+;;   Before you type n to go to the next article, hit a number from 1-5
+;;   Type r in the summary buffer and you will be prompted.
+;;   Note that when you're in grouplens-minor-mode 'r' maskes the
+;;   usual reply binding for 'r'
+;;
+;; What if, Gasp, I find a bug???
+;; Please type M-x gnus-gl-submit-bug-report.  This will set up a
+;; mail buffer with the  state of variables and buffers that will help
+;; me debug the problem.  A short description up front would help too!
+;; 
+;; How do I display the prediction for an aritcle:
+;;  If you set the gnus-summary-line-format as shown above, the score
+;;  (prediction) will be shown automatically.
+;;
+;; 
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;; Programmer  Notes 
+;; 10/9/95
+;; gnus-scores-articles contains the articles
+;; When scoring is done, the call tree looks something like:
+;; gnus-possibly-score-headers
+;;  ==> gnus-score-headers
+;;      ==> gnus-score-load-file
+;;          ==> get-all-mids  (from the eval form)
+;;
+;; it would be nice to have one that gets called after all the other
+;; headers have been scored.
+;; we may want a variable gnus-grouplens-scale-factor
+;; and gnus-grouplens-offset  this would probably be either -3 or 0
+;; to make the scores centered around zero or not.
+;; Notes 10/12/95
+;; According to Lars, Norse god of gnus, the simple way to insert a
+;; call to an external function is to have a function added to the
+;; variable gnus-score-find-files-function  This new function
+;; gnus-grouplens-score-alist will return a core alist that
+;; has (("message-id" ("<message-id-xxxx>" score) ("<message-id-xxxy>" score))
+;; This seems like it would be pretty inefficient, though workable.
+;;
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;;  TODO
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;;
+;; 3. Add some more ways to rate messages
+;; 4. Better error handling for token timeouts.
+;;
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;; bugs
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;; 
+
+;;; Code:
+
+(require 'gnus-score)
+(require 'cl)
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;;;; User variables
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+
+(defvar gnus-summary-grouplens-line-format
+  "%U%R%z%l%I%(%[%4L: %-20,20n%]%) %s\n"
+  "*The line format spec in summary GroupLens mode buffers.")
+
+(defvar grouplens-pseudonym ""
+  "User's pseudonym.  This pseudonym is obtained during the registration process")
+
+(defvar grouplens-bbb-host "grouplens.cs.umn.edu"
+  "Host where the bbbd is running" )
+
+(defvar grouplens-bbb-port 9000 
+  "Port where the bbbd is listening" )
+
+(defvar grouplens-newsgroups 
+  '("comp.lang.c++" "rec.humor" "rec.food.recipes" "comp.groupware"
+    "mn.general" "rec.arts.movies" "rec.arts.movies.current-films"
+    "comp.lang.java" "comp.os.linux.announce" "comp.os.linux.misc"
+    "comp.os.linux.development.apps" "comp.os.linux.development.system")
+  "*Groups that are part of the GroupLens experiment.")
+
+(defvar grouplens-prediction-display 'prediction-spot
+  "valid values are: 
+      prediction-spot -- an * corresponding to the prediction between 1 and 5, 
+      confidence-interval -- a numeric confidence interval
+      prediction-bar --  |#####     | the longer the bar, the better the article,
+      confidence-bar --  |  -----   } the prediction is in the middle of the bar,
+      confidence-spot -- )  *       | the spot gets bigger with more confidence,
+      prediction-num  --   plain-old numeric value,
+      confidence-plus-minus  -- prediction +/i confidence")
+
+(defvar grouplens-score-offset 0
+  "Offset the prediction by this value.  
+Setting this variable to -2 would have the following effect on
+GroupLens scores:
+
+   1   -->   -2
+   2   -->   -1
+   3   -->    0
+   4   -->    1
+   5   -->    2
+   
+The reason is that a user might want to do this is to combine
+GroupLens predictions with scores calculated by other score methods.")
+
+(defvar grouplens-score-scale-factor 1
+  "This variable allows the user to magnify the effect of GroupLens scores. 
+The scale factor is applied after the offset.")
+
+(defvar gnus-grouplens-override-scoring 'override
+  "Tell Grouplens to override the normal Gnus scoring mechanism.  
+GroupLens scores can be combined with gnus scores in one of three ways.
+'override -- just use grouplens predictions for grouplens groups
+'combine  -- combine grouplens scores with gnus scores
+'separate -- treat grouplens scores completely separate from gnus")
+
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;;;; Program global variables
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+(defvar grouplens-bbb-token "0"
+  "Current session token number")
+
+(defvar grouplens-bbb-process nil
+  "Process Id of current bbbd network stream process")
+
+(defvar grouplens-bbb-buffer nil
+  "Buffer associated with the BBBD process")
+
+(defvar grouplens-rating-alist nil
+  "Current set of  message-id rating pairs")
+
+(defvar grouplens-current-hashtable (make-hash-table :test 'equal :size 100))
+;; this seems like a pretty ugly way to get around the problem, but If 
+;; I don't do this, then the compiler complains when I call gethash
+;;
+(eval-when-compile (setq grouplens-current-hashtable 
+			 (make-hash-table :test 'equal :size 100)))
+
+(defvar grouplens-current-group nil)
+
+(defvar bbb-mid-list nil)
+
+(defvar bbb-alist nil)
+
+(defvar bbb-timeout-secs 10
+  "Number of seconds to wait for some response from the BBB.
+If this times out we give up and assume that something has died..." )
+
+(defvar grouplens-previous-article nil
+  "Message-ID of the last article read.")
+
+(defvar bbb-read-point)
+(defvar bbb-response-point)
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;;;;  Utility Functions
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+(defun bbb-connect-to-bbbd (host port)
+  (unless grouplens-bbb-buffer 
+    (setq grouplens-bbb-buffer 
+	  (get-buffer-create (format " *BBBD trace: %s*" host)))
+    (save-excursion
+      (set-buffer grouplens-bbb-buffer)
+      (make-local-variable 'bbb-read-point)
+      (setq bbb-read-point (point-min))))
+  ;; clear the trace buffer of old output
+  (save-excursion
+    (set-buffer grouplens-bbb-buffer)
+    (erase-buffer))
+  ;; open the connection to the server
+  (setq grouplens-bbb-process nil)
+  (catch 'done
+    (condition-case error
+	(setq grouplens-bbb-process 
+	      (open-network-stream "BBBD" grouplens-bbb-buffer host port))
+      (error (gnus-message 3 "Error: Failed to connect to BBB")
+	     nil))
+    (and (null grouplens-bbb-process) 
+	 (throw 'done nil))
+    ;; (set-process-filter grouplens-bbb-process 'bbb-process-filter)
+    (save-excursion
+      (set-buffer grouplens-bbb-buffer)
+      (setq bbb-read-point (point-min))
+      (or (bbb-read-response grouplens-bbb-process)
+	  (throw 'done nil))))
+  grouplens-bbb-process)
+
+;; (defun bbb-process-filter (process output)
+;;   (save-excursion
+;;     (set-buffer (bbb-process-buffer process))
+;;     (goto-char (point-max))
+;;     (insert output)))
+
+(defun bbb-send-command (process command)
+  (goto-char (point-max))
+  (insert command) 
+  (insert "\r\n")
+  (setq bbb-read-point (point))
+  (setq bbb-response-point (point))
+  (set-marker (process-mark process) (point)) ; process output also comes here
+  (process-send-string process command)
+  (process-send-string process "\r\n"))
+
+(defun bbb-read-response (process) ; &optional return-response-string)
+  "This function eats the initial response of OK or ERROR from the BBB."
+  (let ((case-fold-search nil)
+	 match-end)
+    (goto-char bbb-read-point)
+    (while (and (not (search-forward "\r\n" nil t))
+		(accept-process-output process bbb-timeout-secs))
+      (goto-char bbb-read-point))
+    (setq match-end (point))
+    (goto-char bbb-read-point)
+    (setq bbb-read-point match-end)
+    (looking-at "OK")))
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;;;;       Login Functions
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+(defun bbb-login ()
+  "return the token number if login is successful, otherwise return nil"
+  (interactive)
+  (setq grouplens-bbb-token nil)
+  (if (not (equal grouplens-pseudonym ""))
+      (let ((bbb-process 
+	     (bbb-connect-to-bbbd grouplens-bbb-host grouplens-bbb-port)))
+	(if bbb-process
+	    (save-excursion 
+	      (set-buffer (process-buffer bbb-process))
+	      (bbb-send-command bbb-process 
+				(concat "login " grouplens-pseudonym))
+	      (if (bbb-read-response bbb-process)
+		  (setq grouplens-bbb-token (bbb-extract-token-number))
+		(gnus-message 3 "Error: Grouplens login failed")))))
+    (gnus-message 3 "Error: you must set a pseudonym"))
+  grouplens-bbb-token)
+
+(defun bbb-extract-token-number ()
+  (let ((token-pos (search-forward "token=" nil t) ))
+    (if (looking-at "[0-9]+")
+	(buffer-substring token-pos (match-end 0)))))
+
+(gnus-add-shutdown 'bbb-logout 'gnus)
+
+(defun bbb-logout ()
+  "logout of bbb session"
+  (let ((bbb-process 
+	 (bbb-connect-to-bbbd grouplens-bbb-host grouplens-bbb-port)))
+    (if bbb-process
+	(save-excursion 
+	  (set-buffer (process-buffer bbb-process))
+	  (bbb-send-command bbb-process (concat "logout " grouplens-bbb-token))
+	  (bbb-read-response bbb-process))
+      nil)))
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;;;;       Get Predictions
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+
+(defun bbb-build-mid-scores-alist (groupname)
+  "this function can be called as part of the function to return the 
+list of score files to use. See the gnus variable 
+gnus-score-find-score-files-function.  
+
+*Note:*  If you want to use grouplens scores along with calculated scores, 
+you should see the offset and scale variables.  At this point, I don't 
+recommend using both scores and grouplens predictions together."
+  (setq grouplens-current-group groupname)
+  (if (member groupname grouplens-newsgroups)
+      (let* ((mid-list (bbb-get-all-mids))
+	     (predict-list (bbb-get-predictions mid-list groupname)))
+	(setq grouplens-previous-article nil)
+	;; scores-alist should be a list of lists:
+	;;  ((("message-id" ("<mid1>" score1 nil s) ("<mid2> score2 nil s))))
+	;;`((("message-id" . ,predict-list))) ; Yes, this is the return value
+	(list (list (list (append (list "message-id") predict-list)))))
+    nil))
+
+(defun bbb-get-predictions (midlist groupname)
+  "Ask the bbb for predictions, and build up the score alist."
+  (if (or (null grouplens-bbb-token)
+	  (equal grouplens-bbb-token "0"))
+      (progn 
+	(gnus-message 3 "Error: You are not logged in to a BBB")
+	nil)
+    (gnus-message 5 "Fetching Predictions...")
+    (let (predict-list
+	  (predict-command (bbb-build-predict-command midlist groupname 
+						      grouplens-bbb-token))
+	  (bbb-process (bbb-connect-to-bbbd grouplens-bbb-host 
+					    grouplens-bbb-port)))
+      (if bbb-process
+	  (save-excursion 
+	    (set-buffer (process-buffer bbb-process))
+	    (bbb-send-command bbb-process predict-command)
+	    (if (bbb-read-response bbb-process)
+		(setq predict-list (bbb-get-prediction-response bbb-process))
+	      (gnus-message 1 "Invalid Token, login and try again")
+	      (ding))))
+      (setq bbb-alist predict-list))))
+
+(defun bbb-get-all-mids ()
+  (let ((index (nth 1 (assoc "message-id" gnus-header-index)))
+	(articles gnus-newsgroup-headers)
+	art this)
+    (setq bbb-mid-list nil)
+    (while articles
+      (progn (setq art (car articles)
+		   this (aref art index)
+		   articles (cdr articles))
+	     (setq bbb-mid-list (cons this bbb-mid-list))))
+    bbb-mid-list))
+
+(defun bbb-build-predict-command (mlist grpname token)
+  (let ((cmd (concat "getpredictions " token " " grpname "\r\n"))
+	art)
+    (while mlist
+      (setq art (car mlist)
+	    cmd (concat cmd art "\r\n")
+	    mlist (cdr mlist)))
+    (setq cmd (concat cmd ".\r\n"))
+  cmd))
+
+(defun bbb-get-prediction-response (process)
+  (let ((case-fold-search nil)
+	match-end)
+    (goto-char bbb-read-point)
+    (while (and (not (search-forward ".\r\n" nil t))
+		(accept-process-output process bbb-timeout-secs))
+      (goto-char bbb-read-point))
+    (setq match-end (point))
+    (goto-char (+ bbb-response-point 4))  ;; we ought to be right before OK
+    (bbb-build-response-alist)))
+
+;; build-response-alist assumes that the cursor has been positioned at
+;; the first line of the list of mid/rating pairs.  For now we will
+;; use a prediction of 99 to signify no prediction.  Ultimately, we
+;; should just ignore messages with no predictions.
+(defun bbb-build-response-alist ()
+  (let ((resp nil)
+	(match-end (point)))
+    (setq grouplens-current-hashtable (make-hash-table :test 'equal :size 100))
+    (while
+	(cond ((looking-at "\\(<.*>\\) :nopred=")
+	       (push `(,(bbb-get-mid) ,gnus-summary-default-score nil s) resp)
+	       (forward-line 1)
+	       t)
+	      ((looking-at "\\(<.*>\\) :pred=\\([0-9]\.[0-9][0-9]\\) :conflow=\\([0-9]\.[0-9][0-9]\\) :confhigh=\\([0-9]\.[0-9][0-9]\\)")
+	       (push `(,(bbb-get-mid) ,(bbb-get-pred) nil s) resp)
+	       (cl-puthash (bbb-get-mid)
+			   (list (bbb-get-pred) (bbb-get-confl) (bbb-get-confh))
+			   grouplens-current-hashtable)
+	       (forward-line 1)
+	       t)
+	      ((looking-at "\\(<.*>\\) :pred=\\([0-9]\.[0-9][0-9]\\)")
+	       (push `(,(bbb-get-mid) ,(bbb-get-pred) nil s) resp)
+	       (cl-puthash (bbb-get-mid)
+			   (list (bbb-get-pred) 0 0)
+			   grouplens-current-hashtable)
+	       (forward-line 1)
+	       t)
+	      (t nil)))
+    resp))
+
+;; these two functions assume that there is an active match lying
+;; around.  Where the first parenthesized expression is the
+;; message-id, and the second is the prediction.  Since gnus assumes
+;; that scores are integer values?? we round the prediction.
+(defun bbb-get-mid ()
+  (buffer-substring (match-beginning 1) (match-end 1)))
+
+(defun bbb-get-pred ()
+  (let ((tpred (string-to-number (buffer-substring  
+				      (match-beginning 2) 
+				      (match-end 2)))))
+    (if (> tpred 0)
+	(round (* grouplens-score-scale-factor (+ grouplens-score-offset  tpred)))
+      1)))
+
+(defun bbb-get-confl ()
+  (string-to-number (buffer-substring (match-beginning 3) (match-end 3))))
+
+(defun bbb-get-confh ()
+  (string-to-number (buffer-substring (match-beginning 4) (match-end 4))))
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;;;;      Prediction Display
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+(defconst grplens-rating-range 4.0)
+(defconst grplens-maxrating 5)
+(defconst grplens-minrating 1)
+(defconst grplens-predstringsize 12)
+
+(defvar gnus-tmp-score)
+(defun bbb-grouplens-score (header)
+  (if (eq gnus-grouplens-override-scoring 'separate)
+      (bbb-grouplens-other-score header)
+    (let* ((rate-string (make-string 12 ? ))
+	   (mid (aref header (nth 1 (assoc "message-id" gnus-header-index))))
+	   (hashent (gethash mid grouplens-current-hashtable))
+	   (iscore gnus-tmp-score)
+	   (low (car (cdr hashent)))
+	   (high (car (cdr (cdr hashent)))))
+      (aset rate-string 0 ?|) 
+      (aset rate-string 11 ?|)
+      (unless (member grouplens-current-group grouplens-newsgroups)
+	(unless (equal grouplens-prediction-display 'prediction-num)
+	  (cond ((< iscore 0)
+		 (setq iscore 1))
+		((> iscore 5)
+		 (setq iscore 5))))
+	(setq low 0) 
+	(setq high 0))
+      (if (and (bbb-valid-score iscore) 
+	       (not (null mid)))
+	  (cond 
+	   ;; prediction-spot
+	   ((equal grouplens-prediction-display 'prediction-spot)
+	    (setq rate-string (bbb-fmt-prediction-spot rate-string iscore)))
+	   ;; confidence-interval
+	   ((equal grouplens-prediction-display 'confidence-interval)
+	    (setq rate-string (bbb-fmt-confidence-interval iscore low high)))
+	   ;; prediction-bar
+	   ((equal grouplens-prediction-display 'prediction-bar)
+	    (setq rate-string (bbb-fmt-prediction-bar rate-string iscore)))
+	   ;; confidence-bar
+	   ((equal grouplens-prediction-display 'confidence-bar)
+	    (setq rate-string (format "|   %4.2f   |" iscore)))
+	   ;; confidence-spot
+	   ((equal grouplens-prediction-display 'confidence-spot)
+	    (setq rate-string (format "|   %4.2f   |" iscore)))
+	   ;; prediction-num
+	   ((equal grouplens-prediction-display 'prediction-num)
+	    (setq rate-string (bbb-fmt-prediction-num iscore)))
+	   ;; confidence-plus-minus
+	   ((equal grouplens-prediction-display 'confidence-plus-minus)
+	    (setq rate-string (bbb-fmt-confidence-plus-minus iscore low high))
+	    )
+	   (t (gnus-message 3 "Invalid prediction display type")))
+	(aset rate-string 5 ?N) (aset rate-string 6 ?A))
+      rate-string)))
+
+;;
+;; Gnus user format function that doesn't depend on
+;; bbb-build-mid-scores-alist being used as the score function, but is
+;; instead called from gnus-select-group-hook. -- LAB
+(defun bbb-grouplens-other-score (header)
+  (if (not (member grouplens-current-group grouplens-newsgroups))
+      ;; Return an empty string
+      ""
+    (let* ((rate-string (make-string 12 ? ))
+           (mid (aref header (nth 1 (assoc "message-id" gnus-header-index))))
+           (hashent (gethash mid grouplens-current-hashtable))
+           (pred (or (nth 0 hashent) 0))
+           (low (nth 1 hashent))
+           (high (nth 2 hashent)))
+      ;; Init rate-string
+      (aset rate-string 0 ?|) 
+      (aset rate-string 11 ?|)
+      (unless (equal grouplens-prediction-display 'prediction-num)
+	(cond ((< pred 0)
+	       (setq pred 1))
+	      ((> pred 5)
+	       (setq pred 5))))
+      ;; If no entry in BBB hash mark rate string as NA and return
+      (cond 
+       ((null hashent) 
+	(aset rate-string 5 ?N) 
+	(aset rate-string 6 ?A)
+	rate-string)
+
+       ((equal grouplens-prediction-display 'prediction-spot)
+	(bbb-fmt-prediction-spot rate-string pred))
+       
+       ((equal grouplens-prediction-display 'confidence-interval)
+	(bbb-fmt-confidence-interval pred low high))
+       
+       ((equal grouplens-prediction-display 'prediction-bar)
+	(bbb-fmt-prediction-bar rate-string pred))
+
+       ((equal grouplens-prediction-display 'confidence-bar)
+	(format "|   %4.2f   |" pred))
+
+       ((equal grouplens-prediction-display 'confidence-spot)
+	(format "|   %4.2f   |" pred))
+       
+       ((equal grouplens-prediction-display 'prediction-num)
+	(bbb-fmt-prediction-num pred))
+       
+       ((equal grouplens-prediction-display 'confidence-plus-minus)
+	(bbb-fmt-confidence-plus-minus pred low high))
+       
+       (t 
+	(gnus-message 3 "Invalid prediction display type")
+	(aset rate-string 0 ?|) 
+	(aset rate-string 11 ?|)
+	rate-string)))))
+
+(defun bbb-valid-score (score)
+  (or (equal grouplens-prediction-display 'prediction-num)
+      (and (>= score grplens-minrating)
+	   (<= score grplens-maxrating))))
+
+(defun bbb-requires-confidence (format-type)
+  (or (equal format-type 'confidence-plus-minus)
+      (equal format-type 'confidence-spot)
+      (equal format-type 'confidence-interval)))
+
+(defun bbb-have-confidence (clow chigh)
+  (not (or (null clow)
+	   (null chigh))))
+
+(defun bbb-fmt-prediction-spot (rate-string score)
+  (aset rate-string
+	(round (* (/ (- score grplens-minrating) grplens-rating-range)
+		  (+ (- grplens-predstringsize 4) 1.49)))
+	?*)
+  rate-string)
+
+(defun bbb-fmt-confidence-interval (score low high)
+  (if (bbb-have-confidence low high)
+      (format "|%4.2f-%4.2f |" low high)
+    (bbb-fmt-prediction-num score)))
+
+(defun bbb-fmt-confidence-plus-minus (score low high)
+  (if (bbb-have-confidence low high)
+      (format "|%3.1f+/-%4.2f|" score (/ (- high low) 2.0))
+    (bbb-fmt-prediction-num score)))
+
+(defun bbb-fmt-prediction-bar (rate-string score)
+  (let* ((i 1) 
+	 (step (/ grplens-rating-range (- grplens-predstringsize 4)))
+	 (half-step (/ step 2))
+	 (loc (- grplens-minrating half-step)))
+    (while (< i (- grplens-predstringsize 2))
+      (if (> score loc)
+	  (aset rate-string i ?#)
+	(aset rate-string i ? ))
+      (setq i (+ i 1))
+      (setq loc (+ loc step)))
+    )
+  rate-string)
+
+(defun bbb-fmt-prediction-num (score)
+  (format "|   %4.2f   |" score))
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;;;;       Put Ratings
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+
+;; The message-id for the current article can be found in
+;; (aref gnus-current-headers (nth 1 (assoc "message-id" gnus-header-index)))
+
+(defun bbb-put-ratings ()
+  (if (and grouplens-rating-alist 
+	   (member gnus-newsgroup-name grouplens-newsgroups))
+      (let ((bbb-process (bbb-connect-to-bbbd grouplens-bbb-host 
+					  grouplens-bbb-port))
+	    (rate-command (bbb-build-rate-command grouplens-rating-alist)))
+	(if bbb-process
+	    (save-excursion 
+	      (set-buffer (process-buffer bbb-process))
+	      (gnus-message 5 "Sending Ratings...")
+	      (bbb-send-command bbb-process rate-command)
+	      (if (bbb-read-response bbb-process)
+		  (setq grouplens-rating-alist nil)
+		(gnus-message 1 
+			      "Token timed out: call bbb-login and quit again")
+		(ding))
+	      (gnus-message 5 "Sending Ratings...Done"))
+	  (gnus-message 3 "No BBB connection")))
+    (setq grouplens-rating-alist nil)))
+
+(defun bbb-build-rate-command (rate-alist)
+  (let (this
+	(cmd (concat "putratings " grouplens-bbb-token 
+		     " " grouplens-current-group " \r\n")))
+    (while rate-alist
+      (setq this (car rate-alist)
+	    cmd (concat cmd (car this) " :rating=" (cadr this) ".00"
+			" :time=" (cddr this) "\r\n")
+	    rate-alist (cdr rate-alist)))
+    (concat cmd ".\r\n")))
+
+;; Interactive rating functions.
+(defun bbb-summary-rate-article (rating &optional midin)
+  (interactive "nRating: ")
+  (when (member gnus-newsgroup-name grouplens-newsgroups)
+    (let ((mid (or midin (bbb-get-current-id))))
+      (if (and rating 
+	       (>= rating grplens-minrating) 
+	       (<= rating grplens-maxrating)
+	       mid)
+	  (let ((oldrating (assoc mid grouplens-rating-alist)))
+	    (if oldrating
+		(setcdr oldrating (cons rating 0))
+	      (push `(,mid . (,rating . 0)) grouplens-rating-alist))
+	    (gnus-summary-mark-article nil (int-to-string rating)))	
+	(gnus-message 3 "Invalid rating")))))
+
+(defun grouplens-next-unread-article (rating)
+  "Select unread article after current one."
+  (interactive "P")
+  (if rating (bbb-summary-rate-article rating))
+  (gnus-summary-next-unread-article))
+
+(defun grouplens-best-unread-article (rating)
+  "Select unread article after current one."
+  (interactive "P")
+  (if rating (bbb-summary-rate-article rating))
+  (gnus-summary-best-unread-article))
+
+(defun grouplens-summary-catchup-and-exit (rating)
+   "Mark all articles not marked as unread in this newsgroup as read, 
+    then exit.   If prefix argument ALL is non-nil, all articles are 
+    marked as read."
+   (interactive "P")
+   (if rating
+       (bbb-summary-rate-article rating))
+   (if (numberp rating)
+       (gnus-summary-catchup-and-exit)
+     (gnus-summary-catchup-and-exit rating)))
+
+(defun grouplens-score-thread (score)
+  "Raise the score of the articles in the current thread with SCORE."
+  (interactive "nRating: ")
+  (let (e)
+    (save-excursion
+      (let ((articles (gnus-summary-articles-in-thread)))
+	(while articles
+	  (gnus-summary-goto-subject (car articles))
+	  (gnus-set-global-variables)
+	  (bbb-summary-rate-article score
+				    (mail-header-id 
+				     (gnus-summary-article-header 
+				      (car articles))))
+	  (setq articles (cdr articles))))
+      (setq e (point)))
+    (let ((gnus-summary-check-current t))
+      (or (zerop (gnus-summary-next-subject 1 t))
+	  (goto-char e))))
+  (gnus-summary-recenter)
+  (gnus-summary-position-point)
+  (gnus-set-mode-line 'summary))
+
+
+(defun bbb-get-current-id ()
+  (if gnus-current-headers
+      (aref gnus-current-headers 
+	    (nth 1 (assoc "message-id" gnus-header-index)))
+    (gnus-message 3 "You must select an article before you rate it")))
+
+(defun bbb-grouplens-group-p (group)
+  "Say whether GROUP is a GroupLens group."
+  (if (member group grouplens-newsgroups) " (GroupLens Enhanced)" ""))
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;;          TIME SPENT READING
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+(defvar grouplens-current-starting-time nil)
+
+(defun grouplens-start-timer ()
+  (setq grouplens-current-starting-time (current-time)))
+
+(defun grouplens-elapsed-time ()
+  (let ((et (bbb-time-float (current-time))))
+    (- et (bbb-time-float grouplens-current-starting-time))))
+
+(defun bbb-time-float (timeval)
+  (+ (* (car timeval) 65536) 
+	(cadr timeval)))
+
+(defun grouplens-do-time ()
+  (when (member gnus-newsgroup-name grouplens-newsgroups)
+    (when grouplens-previous-article
+      (let ((elapsed-time (grouplens-elapsed-time))
+	    (oldrating (assoc grouplens-previous-article 
+			      grouplens-rating-alist)))
+	(if (not oldrating)
+	    (push `(,grouplens-previous-article . (0 . ,elapsed-time))
+		  grouplens-rating-alist)
+	  (setcdr oldrating (cons (cadr oldrating) elapsed-time)))))
+    (grouplens-start-timer)
+    (setq grouplens-previous-article (bbb-get-current-id))))
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;;          BUG REPORTING
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+
+(defconst gnus-gl-version "gnus-gl.el 2.12")
+(defconst gnus-gl-maintainer-address "grouplens-bug@cs.umn.edu")
+(defun gnus-gl-submit-bug-report ()
+  "Submit via mail a bug report on gnus-gl"
+  (interactive)
+  (require 'reporter)
+  (reporter-submit-bug-report gnus-gl-maintainer-address
+			      (concat "gnus-gl.el " gnus-gl-version)
+			      (list 'grouplens-pseudonym
+				    'grouplens-bbb-host
+				    'grouplens-bbb-port
+				    'grouplens-newsgroups
+				    'grouplens-bbb-token
+				    'grouplens-bbb-process
+				    'grouplens-current-group
+				    'grouplens-previous-article
+				    'grouplens-mid-list
+				    'bbb-alist)
+			      nil
+			      'gnus-gl-get-trace))
+
+(defun gnus-gl-get-trace ()
+  "Insert the contents of the BBBD trace buffer"
+  (if grouplens-bbb-buffer (insert-buffer grouplens-bbb-buffer)))
+
+;;;
+;;; Additions to make gnus-grouplens-mode  Warning Warning!!
+;;;      This version of the gnus-grouplens-mode does
+;;;      not work with gnus-5.x.  The "old" way of
+;;;      setting up GroupLens still works however.
+;;;
+(defvar gnus-grouplens-mode nil
+  "Minor mode for providing a GroupLens interface in Gnus summary buffers.")
+
+(defvar gnus-grouplens-mode-map nil)
+
+(unless gnus-grouplens-mode-map
+  (setq gnus-grouplens-mode-map (make-keymap))
+  (gnus-define-keys
+   gnus-grouplens-mode-map
+   "n" grouplens-next-unread-article
+   "r" bbb-summary-rate-article
+   "k" grouplens-score-thread
+   "c" grouplens-summary-catchup-and-exit
+   "," grouplens-best-unread-article))
+
+(defun gnus-grouplens-make-menu-bar ()
+  (unless (boundp 'gnus-grouplens-menu)
+    (easy-menu-define
+     gnus-grouplens-menu gnus-grouplens-mode-map ""
+     '("GroupLens"
+       ["Login" bbb-login t]
+       ["Rate" bbb-summary-rate-article t]
+       ["Next article" grouplens-next-unread-article t]
+       ["Best article" grouplens-best-unread-article t]
+       ["Raise thread" grouplens-score-thread t]
+       ["Report bugs" gnus-gl-submit-bug-report t]))))
+
+(defun gnus-grouplens-mode (&optional arg)
+  "Minor mode for providing a GroupLens interface in Gnus summary buffers."
+  (interactive "P")
+  (when (and (eq major-mode 'gnus-summary-mode)
+	     (member gnus-newsgroup-name grouplens-newsgroups))
+    (make-local-variable 'gnus-grouplens-mode)
+    (setq gnus-grouplens-mode 
+	  (if (null arg) (not gnus-grouplens-mode)
+	    (> (prefix-numeric-value arg) 0)))
+    (when gnus-grouplens-mode
+      (if (not (fboundp 'make-local-hook))
+	  (add-hook 'gnus-select-article-hook 'grouplens-do-time)
+	(make-local-hook 'gnus-select-article-hook)
+	(add-hook 'gnus-select-article-hook 'grouplens-do-time nil 'local))
+      (if (not (fboundp 'make-local-hook))
+	  (add-hook 'gnus-exit-group-hook 'bbb-put-ratings)
+	(make-local-hook 'gnus-exit-group-hook)
+	(add-hook 'gnus-exit-group-hook 'bbb-put-ratings nil 'local))
+      (make-local-variable 'gnus-score-find-score-files-function)
+      (cond ((eq gnus-grouplens-override-scoring 'combine)
+	     ;; either add bbb-buld-mid-scores-alist to a list
+             ;; or make a list
+	     (if (listp gnus-score-find-score-files-function)
+		 (setq gnus-score-find-score-files-function 
+		   (append 'bbb-build-mid-scores-alist      
+			   gnus-score-find-score-files-function ))
+	       (setq gnus-score-find-score-files-function 
+		     (list gnus-score-find-score-files-function 
+			   'bbb-build-mid-scores-alist))))
+	     ;; leave the gnus-score-find-score-files variable alone
+	    ((eq gnus-grouplens-override-scoring 'separate)
+	     (add-hook 'gnus-select-group-hook 
+		       '(lambda() 
+			  (bbb-build-mid-scores-alist gnus-newsgroup-name))))
+	    ;; default is to override
+	    (t (setq gnus-score-find-score-files-function 
+		     'bbb-build-mid-scores-alist)))
+      (make-local-variable 'gnus-summary-line-format)
+      (setq gnus-summary-line-format 
+	    gnus-summary-grouplens-line-format)
+      (make-local-variable 'gnus-summary-line-format-spec)
+      (setq gnus-summary-line-format-spec nil)
+
+      ;; Set up the menu.
+      (when (and menu-bar-mode
+		 (gnus-visual-p 'grouplens-menu 'menu))
+	(gnus-grouplens-make-menu-bar))
+      (unless (assq 'gnus-grouplens-mode minor-mode-alist)
+	(push '(gnus-grouplens-mode " GroupLens") minor-mode-alist))
+      (unless (assq 'gnus-grouplens-mode minor-mode-map-alist)
+	(push (cons 'gnus-grouplens-mode gnus-grouplens-mode-map)
+	      minor-mode-map-alist))
+      (run-hooks 'gnus-grouplens-mode-hook))))
+
+(provide 'gnus-gl)
+
+;;; gnus-gl.el ends here