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eec82323 LMI |
1 | ;;; gnus-logic.el --- advanced scoring code for Gnus |
2 | ;; Copyright (C) 1996,97 Free Software Foundation, Inc. | |
3 | ||
4 | ;; Author: Lars Magne Ingebrigtsen <larsi@ifi.uio.no> | |
5 | ;; Keywords: news | |
6 | ||
7 | ;; This file is part of GNU Emacs. | |
8 | ||
9 | ;; GNU Emacs is free software; you can redistribute it and/or modify | |
10 | ;; it under the terms of the GNU General Public License as published by | |
11 | ;; the Free Software Foundation; either version 2, or (at your option) | |
12 | ;; any later version. | |
13 | ||
14 | ;; GNU Emacs is distributed in the hope that it will be useful, | |
15 | ;; but WITHOUT ANY WARRANTY; without even the implied warranty of | |
16 | ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
17 | ;; GNU General Public License for more details. | |
18 | ||
19 | ;; You should have received a copy of the GNU General Public License | |
20 | ;; along with GNU Emacs; see the file COPYING. If not, write to the | |
21 | ;; Free Software Foundation, Inc., 59 Temple Place - Suite 330, | |
22 | ;; Boston, MA 02111-1307, USA. | |
23 | ||
24 | ;;; Commentary: | |
25 | ||
26 | ;;; Code: | |
27 | ||
28 | (require 'gnus) | |
29 | (require 'gnus-score) | |
30 | (require 'gnus-util) | |
31 | ||
32 | ;;; Internal variables. | |
33 | ||
34 | (defvar gnus-advanced-headers nil) | |
35 | ||
36 | ;; To avoid having 8-bit characters in the source file. | |
37 | (defvar gnus-advanced-not (intern (format "%c" 172))) | |
38 | ||
39 | (defconst gnus-advanced-index | |
40 | ;; Name to index alist. | |
41 | '(("number" 0 gnus-advanced-integer) | |
42 | ("subject" 1 gnus-advanced-string) | |
43 | ("from" 2 gnus-advanced-string) | |
44 | ("date" 3 gnus-advanced-date) | |
45 | ("message-id" 4 gnus-advanced-string) | |
46 | ("references" 5 gnus-advanced-string) | |
47 | ("chars" 6 gnus-advanced-integer) | |
48 | ("lines" 7 gnus-advanced-integer) | |
49 | ("xref" 8 gnus-advanced-string) | |
50 | ("head" nil gnus-advanced-body) | |
51 | ("body" nil gnus-advanced-body) | |
52 | ("all" nil gnus-advanced-body))) | |
53 | ||
54 | (eval-and-compile | |
55 | (autoload 'parse-time-string "parse-time")) | |
56 | ||
57 | (defun gnus-score-advanced (rule &optional trace) | |
58 | "Apply advanced scoring RULE to all the articles in the current group." | |
59 | (let ((headers gnus-newsgroup-headers) | |
60 | gnus-advanced-headers score) | |
61 | (while (setq gnus-advanced-headers (pop headers)) | |
62 | (when (gnus-advanced-score-rule (car rule)) | |
63 | ;; This rule was successful, so we add the score to | |
64 | ;; this article. | |
65 | (if (setq score (assq (mail-header-number gnus-advanced-headers) | |
66 | gnus-newsgroup-scored)) | |
67 | (setcdr score | |
68 | (+ (cdr score) | |
69 | (or (nth 1 rule) | |
70 | gnus-score-interactive-default-score))) | |
71 | (push (cons (mail-header-number gnus-advanced-headers) | |
72 | (or (nth 1 rule) | |
73 | gnus-score-interactive-default-score)) | |
74 | gnus-newsgroup-scored) | |
75 | (when trace | |
76 | (push (cons "A file" rule) | |
77 | gnus-score-trace))))))) | |
78 | ||
79 | (defun gnus-advanced-score-rule (rule) | |
80 | "Apply RULE to `gnus-advanced-headers'." | |
81 | (let ((type (car rule))) | |
82 | (cond | |
83 | ;; "And" rule. | |
84 | ((or (eq type '&) (eq type 'and)) | |
85 | (pop rule) | |
86 | (if (not rule) | |
87 | t ; Empty rule is true. | |
88 | (while (and rule | |
89 | (gnus-advanced-score-rule (car rule))) | |
90 | (pop rule)) | |
91 | ;; If all the rules were true, then `rule' should be nil. | |
92 | (not rule))) | |
93 | ;; "Or" rule. | |
94 | ((or (eq type '|) (eq type 'or)) | |
95 | (pop rule) | |
96 | (if (not rule) | |
97 | nil | |
98 | (while (and rule | |
99 | (not (gnus-advanced-score-rule (car rule)))) | |
100 | (pop rule)) | |
101 | ;; If one of the rules returned true, then `rule' should be non-nil. | |
102 | rule)) | |
103 | ;; "Not" rule. | |
104 | ((or (eq type '!) (eq type 'not) (eq type gnus-advanced-not)) | |
105 | (not (gnus-advanced-score-rule (nth 1 rule)))) | |
106 | ;; This is a `1-'-type redirection rule. | |
107 | ((and (symbolp type) | |
108 | (string-match "^[0-9]+-$\\|^\\^+$" (symbol-name type))) | |
109 | (let ((gnus-advanced-headers | |
110 | (gnus-parent-headers | |
111 | gnus-advanced-headers | |
112 | (if (string-match "^\\([0-9]+\\)-$" (symbol-name type)) | |
113 | ;; 1- type redirection. | |
114 | (string-to-number | |
115 | (substring (symbol-name type) | |
116 | (match-beginning 0) (match-end 0))) | |
117 | ;; ^^^ type redirection. | |
118 | (length (symbol-name type)))))) | |
119 | (when gnus-advanced-headers | |
120 | (gnus-advanced-score-rule (nth 1 rule))))) | |
121 | ;; Plain scoring rule. | |
122 | ((stringp type) | |
123 | (gnus-advanced-score-article rule)) | |
124 | ;; Bug-out time! | |
125 | (t | |
126 | (error "Unknown advanced score type: %s" rule))))) | |
127 | ||
128 | (defun gnus-advanced-score-article (rule) | |
129 | ;; `rule' is a semi-normal score rule, so we find out | |
130 | ;; what function that's supposed to do the actual | |
131 | ;; processing. | |
132 | (let* ((header (car rule)) | |
133 | (func (assoc (downcase header) gnus-advanced-index))) | |
134 | (if (not func) | |
135 | (error "No such header: %s" rule) | |
136 | ;; Call the score function. | |
137 | (funcall (caddr func) (or (cadr func) header) | |
138 | (cadr rule) (caddr rule))))) | |
139 | ||
140 | (defun gnus-advanced-string (index match type) | |
141 | "See whether string MATCH of TYPE matches `gnus-advanced-headers' in INDEX." | |
142 | (let* ((type (or type 's)) | |
143 | (case-fold-search (not (eq (downcase (symbol-name type)) | |
144 | (symbol-name type)))) | |
145 | (header (aref gnus-advanced-headers index))) | |
146 | (cond | |
147 | ((memq type '(r R regexp Regexp)) | |
148 | (string-match match header)) | |
149 | ((memq type '(s S string String)) | |
150 | (string-match (regexp-quote match) header)) | |
151 | ((memq type '(e E exact Exact)) | |
152 | (string= match header)) | |
153 | ((memq type '(f F fuzzy Fuzzy)) | |
154 | (string-match (regexp-quote (gnus-simplify-subject-fuzzy match)) | |
155 | header)) | |
156 | (t | |
157 | (error "No such string match type: %s" type))))) | |
158 | ||
159 | (defun gnus-advanced-integer (index match type) | |
160 | (if (not (memq type '(< > <= >= =))) | |
161 | (error "No such integer score type: %s" type) | |
162 | (funcall type match (or (aref gnus-advanced-headers index) 0)))) | |
163 | ||
164 | (defun gnus-advanced-date (index match type) | |
165 | (let ((date (encode-time (parse-time-string | |
166 | (aref gnus-advanced-headers index)))) | |
167 | (match (encode-time (parse-time-string match)))) | |
168 | (cond | |
169 | ((eq type 'at) | |
170 | (equal date match)) | |
171 | ((eq type 'before) | |
172 | (gnus-time-less match date)) | |
173 | ((eq type 'after) | |
174 | (gnus-time-less date match)) | |
175 | (t | |
176 | (error "No such date score type: %s" type))))) | |
177 | ||
178 | (defun gnus-advanced-body (header match type) | |
179 | (when (string= header "all") | |
180 | (setq header "article")) | |
181 | (save-excursion | |
182 | (set-buffer nntp-server-buffer) | |
183 | (let* ((request-func (cond ((string= "head" header) | |
184 | 'gnus-request-head) | |
185 | ((string= "body" header) | |
186 | 'gnus-request-body) | |
187 | (t 'gnus-request-article))) | |
188 | ofunc article) | |
189 | ;; Not all backends support partial fetching. In that case, | |
190 | ;; we just fetch the entire article. | |
191 | (unless (gnus-check-backend-function | |
192 | (intern (concat "request-" header)) | |
193 | gnus-newsgroup-name) | |
194 | (setq ofunc request-func) | |
195 | (setq request-func 'gnus-request-article)) | |
196 | (setq article (mail-header-number gnus-advanced-headers)) | |
197 | (gnus-message 7 "Scoring article %s..." article) | |
198 | (when (funcall request-func article gnus-newsgroup-name) | |
199 | (goto-char (point-min)) | |
200 | ;; If just parts of the article is to be searched and the | |
201 | ;; backend didn't support partial fetching, we just narrow | |
202 | ;; to the relevant parts. | |
203 | (when ofunc | |
204 | (if (eq ofunc 'gnus-request-head) | |
205 | (narrow-to-region | |
206 | (point) | |
207 | (or (search-forward "\n\n" nil t) (point-max))) | |
208 | (narrow-to-region | |
209 | (or (search-forward "\n\n" nil t) (point)) | |
210 | (point-max)))) | |
211 | (let* ((case-fold-search (not (eq (downcase (symbol-name type)) | |
212 | (symbol-name type)))) | |
213 | (search-func | |
214 | (cond ((memq type '(r R regexp Regexp)) | |
215 | 're-search-forward) | |
216 | ((memq type '(s S string String)) | |
217 | 'search-forward) | |
218 | (t | |
219 | (error "Illegal match type: %s" type))))) | |
220 | (goto-char (point-min)) | |
221 | (prog1 | |
222 | (funcall search-func match nil t) | |
223 | (widen))))))) | |
224 | ||
225 | (provide 'gnus-logic) | |
226 | ||
227 | ;;; gnus-logic.el ends here. |