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;;; gnus-logic.el --- advanced scoring code for Gnus
;; Copyright (C) 1996-2011 Free Software Foundation, Inc.
;; Author: Lars Magne Ingebrigtsen <larsi@gnus.org>
;; Keywords: news
;; 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 3 of the License, 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. If not, see <http://www.gnu.org/licenses/>.
;;; Commentary:
;;; Code:
(eval-when-compile (require 'cl))
(require 'gnus)
(require 'gnus-score)
(require 'gnus-util)
;;; Internal variables.
(defvar gnus-advanced-headers nil)
;; To avoid having 8-bit characters in the source file.
(defvar gnus-advanced-not (intern (format "%c" 172)))
(defconst gnus-advanced-index
;; Name to index alist.
'(("number" 0 gnus-advanced-integer)
("subject" 1 gnus-advanced-string)
("from" 2 gnus-advanced-string)
("date" 3 gnus-advanced-date)
("message-id" 4 gnus-advanced-string)
("references" 5 gnus-advanced-string)
("chars" 6 gnus-advanced-integer)
("lines" 7 gnus-advanced-integer)
("xref" 8 gnus-advanced-string)
("head" nil gnus-advanced-body)
("body" nil gnus-advanced-body)
("all" nil gnus-advanced-body)))
(autoload 'parse-time-string "parse-time")
(defun gnus-score-advanced (rule &optional trace)
"Apply advanced scoring RULE to all the articles in the current group."
(let (new-score score multiple)
(dolist (gnus-advanced-headers gnus-newsgroup-headers)
(when (setq multiple (gnus-advanced-score-rule (car rule)))
(setq new-score (or (nth 1 rule)
gnus-score-interactive-default-score))
(when (numberp multiple)
(setq new-score (* multiple new-score)))
;; This rule was successful, so we add the score to this
;; article.
(if (setq score (assq (mail-header-number gnus-advanced-headers)
gnus-newsgroup-scored))
(setcdr score
(+ (cdr score) new-score))
(push (cons (mail-header-number gnus-advanced-headers)
new-score)
gnus-newsgroup-scored)
(when trace
(push (cons "A file" rule)
;; Must be synced with `gnus-score-edit-file-at-point'.
gnus-score-trace)))))))
(defun gnus-advanced-score-rule (rule)
"Apply RULE to `gnus-advanced-headers'."
(let ((type (car rule)))
(cond
;; "And" rule.
((or (eq type '&) (eq type 'and))
(pop rule)
(if (not rule)
t ; Empty rule is true.
(while (and rule
(gnus-advanced-score-rule (car rule)))
(pop rule))
;; If all the rules were true, then `rule' should be nil.
(not rule)))
;; "Or" rule.
((or (eq type '|) (eq type 'or))
(pop rule)
(if (not rule)
nil
(while (and rule
(not (gnus-advanced-score-rule (car rule))))
(pop rule))
;; If one of the rules returned true, then `rule' should be non-nil.
rule))
;; "Not" rule.
((or (eq type '!) (eq type 'not) (eq type gnus-advanced-not))
(not (gnus-advanced-score-rule (nth 1 rule))))
;; This is a `1-'-type redirection rule.
((and (symbolp type)
(string-match "^[0-9]+-$\\|^\\^+$" (symbol-name type)))
(let ((gnus-advanced-headers
(gnus-parent-headers
gnus-advanced-headers
(if (string-match "^\\([0-9]+\\)-$" (symbol-name type))
;; 1- type redirection.
(string-to-number
(substring (symbol-name type)
(match-beginning 1) (match-end 1)))
;; ^^^ type redirection.
(length (symbol-name type))))))
(when gnus-advanced-headers
(gnus-advanced-score-rule (nth 1 rule)))))
;; Plain scoring rule.
((stringp type)
(gnus-advanced-score-article rule))
;; Bug-out time!
(t
(error "Unknown advanced score type: %s" rule)))))
(defun gnus-advanced-score-article (rule)
;; `rule' is a semi-normal score rule, so we find out what function
;; that's supposed to do the actual processing.
(let* ((header (car rule))
(func (assoc (downcase header) gnus-advanced-index)))
(if (not func)
(error "No such header: %s" rule)
;; Call the score function.
(funcall (caddr func) (or (cadr func) header)
(cadr rule) (caddr rule)))))
(defun gnus-advanced-string (index match type)
"See whether string MATCH of TYPE matches `gnus-advanced-headers' in INDEX."
(let* ((type (or type 's))
(case-fold-search (not (eq (downcase (symbol-name type))
(symbol-name type))))
(header (or (aref gnus-advanced-headers index) "")))
(cond
((memq type '(r R regexp Regexp))
(string-match match header))
((memq type '(s S string String))
(string-match (regexp-quote match) header))
((memq type '(e E exact Exact))
(string= match header))
((memq type '(f F fuzzy Fuzzy))
(string-match (regexp-quote (gnus-simplify-subject-fuzzy match))
header))
(t
(error "No such string match type: %s" type)))))
(defun gnus-advanced-integer (index match type)
(if (not (memq type '(< > <= >= =)))
(error "No such integer score type: %s" type)
(funcall type (or (aref gnus-advanced-headers index) 0) match)))
(defun gnus-advanced-date (index match type)
(let ((date (apply 'encode-time (parse-time-string
(aref gnus-advanced-headers index))))
(match (apply 'encode-time (parse-time-string match))))
(cond
((eq type 'at)
(equal date match))
((eq type 'before)
(time-less-p match date))
((eq type 'after)
(time-less-p date match))
(t
(error "No such date score type: %s" type)))))
(defun gnus-advanced-body (header match type)
(when (string= header "all")
(setq header "article"))
(with-current-buffer nntp-server-buffer
(let* ((request-func (cond ((string= "head" header)
'gnus-request-head)
((string= "body" header)
'gnus-request-body)
(t 'gnus-request-article)))
ofunc article)
;; Not all backends support partial fetching. In that case, we
;; just fetch the entire article.
(unless (gnus-check-backend-function
(intern (concat "request-" header))
gnus-newsgroup-name)
(setq ofunc request-func)
(setq request-func 'gnus-request-article))
(setq article (mail-header-number gnus-advanced-headers))
(gnus-message 7 "Scoring article %s..." article)
(when (funcall request-func article gnus-newsgroup-name)
(goto-char (point-min))
;; If just parts of the article is to be searched and the
;; backend didn't support partial fetching, we just narrow to
;; the relevant parts.
(when ofunc
(if (eq ofunc 'gnus-request-head)
(narrow-to-region
(point)
(or (search-forward "\n\n" nil t) (point-max)))
(narrow-to-region
(or (search-forward "\n\n" nil t) (point))
(point-max))))
(let* ((case-fold-search (not (eq (downcase (symbol-name type))
(symbol-name type))))
(search-func
(cond ((memq type '(r R regexp Regexp))
're-search-forward)
((memq type '(s S string String))
'search-forward)
(t
(error "Invalid match type: %s" type)))))
(goto-char (point-min))
(prog1
(funcall search-func match nil t)
(widen)))))))
(provide 'gnus-logic)
;;; gnus-logic.el ends here
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