lisp/gnus/gnus-kill.el

   1 ;;; gnus-kill.el --- kill commands for Gnus
   2
   3 ;; Copyright (C) 1995-2015 Free Software Foundation, Inc.
   4
   5 ;; Author: Masanobu UMEDA <umerin@flab.flab.fujitsu.junet>
   6 ;;      Lars Magne Ingebrigtsen <larsi@gnus.org>
   7 ;; Keywords: news
   8
   9 ;; This file is part of GNU Emacs.
  10
  11 ;; GNU Emacs is free software: you can redistribute it and/or modify
  12 ;; it under the terms of the GNU General Public License as published by
  13 ;; the Free Software Foundation, either version 3 of the License, or
  14 ;; (at your option) any later version.
  15
  16 ;; GNU Emacs is distributed in the hope that it will be useful,
  17 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
  18 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  19 ;; GNU General Public License for more details.
  20
  21 ;; You should have received a copy of the GNU General Public License
  22 ;; along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.
  23
  24 ;;; Commentary:
  25
  26 ;;; Code:
  27
  28 (eval-when-compile (require 'cl))
  29
  30 (require 'gnus)
  31 (require 'gnus-art)
  32 (require 'gnus-range)
  33
  34 (defcustom gnus-kill-file-mode-hook nil
  35   "Hook for Gnus kill file mode."
  36   :group 'gnus-score-kill
  37   :type 'hook)
  38
  39 (defcustom gnus-kill-expiry-days 7
  40   "*Number of days before expiring unused kill file entries."
  41   :group 'gnus-score-kill
  42   :group 'gnus-score-expire
  43   :type 'integer)
  44
  45 (defcustom gnus-kill-save-kill-file nil
  46   "*If non-nil, will save kill files after processing them."
  47   :group 'gnus-score-kill
  48   :type 'boolean)
  49
  50 (defcustom gnus-winconf-kill-file nil
  51   "What does this do, Lars?
  52 I don't know, Per."
  53   :group 'gnus-score-kill
  54   :type 'sexp)
  55
  56 (defcustom gnus-kill-killed t
  57   "*If non-nil, Gnus will apply kill files to already killed articles.
  58 If it is nil, Gnus will never apply kill files to articles that have
  59 already been through the scoring process, which might very well save lots
  60 of time."
  61   :group 'gnus-score-kill
  62   :type 'boolean)
  63
  64 \f
  65
  66 (defmacro gnus-raise (field expression level)
  67   `(gnus-kill ,field ,expression
  68               (function (gnus-summary-raise-score ,level)) t))
  69
  70 (defmacro gnus-lower (field expression level)
  71   `(gnus-kill ,field ,expression
  72               (function (gnus-summary-raise-score (- ,level))) t))
  73
  74 ;;;
  75 ;;; Gnus Kill File Mode
  76 ;;;
  77
  78 (defvar gnus-kill-file-mode-map
  79   (let ((map (make-sparse-keymap)))
  80     (set-keymap-parent map emacs-lisp-mode-map)
  81     (gnus-define-keymap map
  82       "\C-c\C-k\C-s" gnus-kill-file-kill-by-subject
  83       "\C-c\C-k\C-a" gnus-kill-file-kill-by-author
  84       "\C-c\C-k\C-t" gnus-kill-file-kill-by-thread
  85       "\C-c\C-k\C-x" gnus-kill-file-kill-by-xref
  86       "\C-c\C-a" gnus-kill-file-apply-buffer
  87       "\C-c\C-e" gnus-kill-file-apply-last-sexp
  88       "\C-c\C-c" gnus-kill-file-exit)
  89     map))
  90
  91 (define-derived-mode gnus-kill-file-mode emacs-lisp-mode "Kill"
  92   "Major mode for editing kill files.
  93
  94 If you are using this mode - you probably shouldn't.  Kill files
  95 perform badly and paint with a pretty broad brush.  Score files, on
  96 the other hand, are vastly faster (40x speedup) and give you more
  97 control over what to do.
  98
  99 In addition to Emacs-Lisp Mode, the following commands are available:
 100
 101 \\{gnus-kill-file-mode-map}
 102
 103   A kill file contains Lisp expressions to be applied to a selected
 104 newsgroup.  The purpose is to mark articles as read on the basis of
 105 some set of regexps.  A global kill file is applied to every newsgroup,
 106 and a local kill file is applied to a specified newsgroup.  Since a
 107 global kill file is applied to every newsgroup, for better performance
 108 use a local one.
 109
 110   A kill file can contain any kind of Emacs Lisp expressions expected
 111 to be evaluated in the Summary buffer.  Writing Lisp programs for this
 112 purpose is not so easy because the internal working of Gnus must be
 113 well-known.  For this reason, Gnus provides a general function which
 114 does this easily for non-Lisp programmers.
 115
 116   The `gnus-kill' function executes commands available in Summary Mode
 117 by their key sequences.  `gnus-kill' should be called with FIELD,
 118 REGEXP and optional COMMAND and ALL.  FIELD is a string representing
 119 the header field or an empty string.  If FIELD is an empty string, the
 120 entire article body is searched for.  REGEXP is a string which is
 121 compared with FIELD value.  COMMAND is a string representing a valid
 122 key sequence in Summary mode or Lisp expression.  COMMAND defaults to
 123 '(gnus-summary-mark-as-read nil \"X\").  Make sure that COMMAND is
 124 executed in the Summary buffer.  If the second optional argument ALL
 125 is non-nil, the COMMAND is applied to articles which are already
 126 marked as read or unread.  Articles which are marked are skipped over
 127 by default.
 128
 129   For example, if you want to mark articles of which subjects contain
 130 the string `AI' as read, a possible kill file may look like:
 131
 132         (gnus-kill \"Subject\" \"AI\")
 133
 134   If you want to mark articles with `D' instead of `X', you can use
 135 the following expression:
 136
 137         (gnus-kill \"Subject\" \"AI\" \"d\")
 138
 139 In this example it is assumed that the command
 140 `gnus-summary-mark-as-read-forward' is assigned to `d' in Summary Mode.
 141
 142   It is possible to delete unnecessary headers which are marked with
 143 `X' in a kill file as follows:
 144
 145         (gnus-expunge \"X\")
 146
 147   If the Summary buffer is empty after applying kill files, Gnus will
 148 exit the selected newsgroup normally.  If headers which are marked
 149 with `D' are deleted in a kill file, it is impossible to read articles
 150 which are marked as read in the previous Gnus sessions.  Marks other
 151 than `D' should be used for articles which should really be deleted.
 152
 153 Entry to this mode calls emacs-lisp-mode-hook and
 154 gnus-kill-file-mode-hook with no arguments, if that value is non-nil.")
 155
 156 (defun gnus-kill-file-edit-file (newsgroup)
 157   "Begin editing a kill file for NEWSGROUP.
 158 If NEWSGROUP is nil, the global kill file is selected."
 159   (interactive "sNewsgroup: ")
 160   (let ((file (gnus-newsgroup-kill-file newsgroup)))
 161     (gnus-make-directory (file-name-directory file))
 162     ;; Save current window configuration if this is first invocation.
 163     (or (and (get-file-buffer file)
 164              (get-buffer-window (get-file-buffer file)))
 165         (setq gnus-winconf-kill-file (current-window-configuration)))
 166     ;; Hack windows.
 167     (let ((buffer (find-file-noselect file)))
 168       (cond ((get-buffer-window buffer)
 169              (pop-to-buffer buffer))
 170             ((derived-mode-p 'gnus-group-mode)
 171              (gnus-configure-windows 'group) ;Take all windows.
 172              (pop-to-buffer buffer))
 173             ((derived-mode-p 'gnus-summary-mode)
 174              (gnus-configure-windows 'article)
 175              (pop-to-buffer gnus-article-buffer)
 176              (bury-buffer gnus-article-buffer)
 177              (switch-to-buffer buffer))
 178             (t                          ;No good rules.
 179              (find-file-other-window file))))
 180     (gnus-kill-file-mode)))
 181
 182 ;; Fix by Sudish Joseph <joseph@cis.ohio-state.edu>.
 183 (defun gnus-kill-set-kill-buffer ()
 184   (let* ((file (gnus-newsgroup-kill-file gnus-newsgroup-name))
 185          (buffer (find-file-noselect file)))
 186     (set-buffer buffer)
 187     (gnus-kill-file-mode)
 188     (bury-buffer buffer)))
 189
 190 (defun gnus-kill-file-enter-kill (field regexp &optional dont-move)
 191   ;; Enter kill file entry.
 192   ;; FIELD: String containing the name of the header field to kill.
 193   ;; REGEXP: The string to kill.
 194   (save-excursion
 195     (let (string)
 196       (unless (derived-mode-p 'gnus-kill-file-mode)
 197         (gnus-kill-set-kill-buffer))
 198       (unless dont-move
 199         (goto-char (point-max)))
 200       (insert (setq string (format "(gnus-kill %S %S)\n" field regexp)))
 201       (gnus-kill-file-apply-string string))))
 202
 203 (defun gnus-kill-file-kill-by-subject ()
 204   "Kill by subject."
 205   (interactive)
 206   (gnus-kill-file-enter-kill
 207    "Subject"
 208    (if (vectorp gnus-current-headers)
 209        (regexp-quote
 210         (gnus-simplify-subject (mail-header-subject gnus-current-headers)))
 211      "")
 212    t))
 213
 214 (defun gnus-kill-file-kill-by-author ()
 215   "Kill by author."
 216   (interactive)
 217   (gnus-kill-file-enter-kill
 218    "From"
 219    (if (vectorp gnus-current-headers)
 220        (regexp-quote (mail-header-from gnus-current-headers))
 221      "") t))
 222
 223 (defun gnus-kill-file-kill-by-thread ()
 224   "Kill by author."
 225   (interactive)
 226   (gnus-kill-file-enter-kill
 227    "References"
 228    (if (vectorp gnus-current-headers)
 229        (regexp-quote (mail-header-id gnus-current-headers))
 230      "")))
 231
 232 (defun gnus-kill-file-kill-by-xref ()
 233   "Kill by Xref."
 234   (interactive)
 235   (let ((xref (and (vectorp gnus-current-headers)
 236                    (mail-header-xref gnus-current-headers)))
 237         (start 0)
 238         group)
 239     (if xref
 240         (while (string-match " \\([^ \t]+\\):" xref start)
 241           (setq start (match-end 0))
 242           (when (not (string=
 243                       (setq group
 244                             (substring xref (match-beginning 1) (match-end 1)))
 245                       gnus-newsgroup-name))
 246             (gnus-kill-file-enter-kill
 247              "Xref" (concat " " (regexp-quote group) ":") t)))
 248       (gnus-kill-file-enter-kill "Xref" "" t))))
 249
 250 (defun gnus-kill-file-raise-followups-to-author (level)
 251   "Raise score for all followups to the current author."
 252   (interactive "p")
 253   (let ((name (mail-header-from gnus-current-headers))
 254         string)
 255     (save-excursion
 256       (gnus-kill-set-kill-buffer)
 257       (goto-char (point-min))
 258       (setq name (read-string (concat "Add " level
 259                                       " to followup articles to: ")
 260                               (regexp-quote name)))
 261       (setq
 262        string
 263        (format
 264         "(gnus-kill %S %S '(gnus-summary-temporarily-raise-by-thread %S))\n"
 265         "From" name level))
 266       (insert string)
 267       (gnus-kill-file-apply-string string))
 268     (gnus-message
 269      6 "Added temporary score file entry for followups to %s." name)))
 270
 271 (defun gnus-kill-file-apply-buffer ()
 272   "Apply current buffer to current newsgroup."
 273   (interactive)
 274   (if (and gnus-current-kill-article
 275            (get-buffer gnus-summary-buffer))
 276       ;; Assume newsgroup is selected.
 277       (gnus-kill-file-apply-string (buffer-string))
 278     (ding) (gnus-message 2 "No newsgroup is selected.")))
 279
 280 (defun gnus-kill-file-apply-string (string)
 281   "Apply STRING to current newsgroup."
 282   (interactive)
 283   (let ((string (concat "(progn \n" string "\n)")))
 284     (save-excursion
 285       (save-window-excursion
 286         (pop-to-buffer gnus-summary-buffer)
 287         (eval (car (read-from-string string)))))))
 288
 289 (defun gnus-kill-file-apply-last-sexp ()
 290   "Apply sexp before point in current buffer to current newsgroup."
 291   (interactive)
 292   (if (and gnus-current-kill-article
 293            (get-buffer gnus-summary-buffer))
 294       ;; Assume newsgroup is selected.
 295       (let ((string
 296              (buffer-substring
 297               (save-excursion (forward-sexp -1) (point)) (point))))
 298         (save-excursion
 299           (save-window-excursion
 300             (pop-to-buffer gnus-summary-buffer)
 301             (eval (car (read-from-string string))))))
 302     (ding) (gnus-message 2 "No newsgroup is selected.")))
 303
 304 (defun gnus-kill-file-exit ()
 305   "Save a kill file, then return to the previous buffer."
 306   (interactive)
 307   (save-buffer)
 308   (let ((killbuf (current-buffer)))
 309     ;; We don't want to return to article buffer.
 310     (when (get-buffer gnus-article-buffer)
 311       (bury-buffer gnus-article-buffer))
 312     ;; Delete the KILL file windows.
 313     (delete-windows-on killbuf)
 314     ;; Restore last window configuration if available.
 315     (when gnus-winconf-kill-file
 316       (set-window-configuration gnus-winconf-kill-file))
 317     (setq gnus-winconf-kill-file nil)
 318     ;; Kill the KILL file buffer.  Suggested by tale@pawl.rpi.edu.
 319     (kill-buffer killbuf)))
 320
 321 ;; For kill files
 322
 323 (defun gnus-expunge (marks)
 324   "Remove lines marked with MARKS."
 325   (with-current-buffer gnus-summary-buffer
 326     (gnus-summary-limit-to-marks marks 'reverse)))
 327
 328 (defun gnus-apply-kill-file-unless-scored ()
 329   "Apply .KILL file, unless a .SCORE file for the same newsgroup exists."
 330   (cond ((file-exists-p (gnus-score-file-name gnus-newsgroup-name))
 331          ;; Ignores global KILL.
 332          (when (file-exists-p (gnus-newsgroup-kill-file gnus-newsgroup-name))
 333            (gnus-message 3 "Note: Ignoring %s.KILL; preferring .SCORE"
 334                          gnus-newsgroup-name))
 335          0)
 336         ((or (file-exists-p (gnus-newsgroup-kill-file nil))
 337              (file-exists-p (gnus-newsgroup-kill-file gnus-newsgroup-name)))
 338          (gnus-apply-kill-file-internal))
 339         (t
 340          0)))
 341
 342 (defun gnus-apply-kill-file-internal ()
 343   "Apply a kill file to the current newsgroup.
 344 Returns the number of articles marked as read."
 345   (let* ((kill-files (list (gnus-newsgroup-kill-file nil)
 346                            (gnus-newsgroup-kill-file gnus-newsgroup-name)))
 347          (unreads (length gnus-newsgroup-unreads))
 348          (gnus-summary-inhibit-highlight t)
 349          beg)
 350     (setq gnus-newsgroup-kill-headers nil)
 351     ;; If there are any previously scored articles, we remove these
 352     ;; from the `gnus-newsgroup-headers' list that the score functions
 353     ;; will see.  This is probably pretty wasteful when it comes to
 354     ;; conses, but is, I think, faster than having to assq in every
 355     ;; single score function.
 356     (let ((files kill-files))
 357       (while files
 358         (if (file-exists-p (car files))
 359             (let ((headers gnus-newsgroup-headers))
 360               (if gnus-kill-killed
 361                   (setq gnus-newsgroup-kill-headers
 362                         (mapcar (lambda (header) (mail-header-number header))
 363                                 headers))
 364                 (while headers
 365                   (unless (gnus-member-of-range
 366                            (mail-header-number (car headers))
 367                            gnus-newsgroup-killed)
 368                     (push (mail-header-number (car headers))
 369                           gnus-newsgroup-kill-headers))
 370                   (setq headers (cdr headers))))
 371               (setq files nil))
 372           (setq files (cdr files)))))
 373     (if (not gnus-newsgroup-kill-headers)
 374         ()
 375       (save-window-excursion
 376         (save-excursion
 377           (while kill-files
 378             (if (not (file-exists-p (car kill-files)))
 379                 ()
 380               (gnus-message 6 "Processing kill file %s..." (car kill-files))
 381               (find-file (car kill-files))
 382               (goto-char (point-min))
 383
 384               (if (consp (ignore-errors (read (current-buffer))))
 385                   (gnus-kill-parse-gnus-kill-file)
 386                 (gnus-kill-parse-rn-kill-file))
 387
 388               (gnus-message
 389                6 "Processing kill file %s...done" (car kill-files)))
 390             (setq kill-files (cdr kill-files)))))
 391
 392       (gnus-set-mode-line 'summary)
 393
 394       (if beg
 395           (let ((nunreads (- unreads (length gnus-newsgroup-unreads))))
 396             (or (eq nunreads 0)
 397                 (gnus-message 6 "Marked %d articles as read" nunreads))
 398             nunreads)
 399         0))))
 400
 401 ;; Parse a Gnus killfile.
 402 (defun gnus-kill-parse-gnus-kill-file ()
 403   (goto-char (point-min))
 404   (gnus-kill-file-mode)
 405   (let (beg form)
 406     (while (progn
 407              (setq beg (point))
 408              (setq form (ignore-errors (read (current-buffer)))))
 409       (unless (listp form)
 410         (error "Invalid kill entry (possibly rn kill file?): %s" form))
 411       (if (or (eq (car form) 'gnus-kill)
 412               (eq (car form) 'gnus-raise)
 413               (eq (car form) 'gnus-lower))
 414           (progn
 415             (delete-region beg (point))
 416             (insert (or (eval form) "")))
 417         (with-current-buffer gnus-summary-buffer
 418           (ignore-errors (eval form)))))
 419     (and (buffer-modified-p)
 420          gnus-kill-save-kill-file
 421          (save-buffer))
 422     (set-buffer-modified-p nil)))
 423
 424 ;; Parse an rn killfile.
 425 (defun gnus-kill-parse-rn-kill-file ()
 426   (goto-char (point-min))
 427   (gnus-kill-file-mode)
 428   (let ((mod-to-header
 429          '((?a . "")
 430            (?h . "")
 431            (?f . "from")
 432            (?: . "subject")))
 433         ;;(com-to-com
 434         ;; '((?m . " ")
 435         ;;   (?j . "X")))
 436         pattern modifier commands)
 437     (while (not (eobp))
 438       (if (not (looking-at "[ \t]*/\\([^/]*\\)/\\([ahfcH]\\)?:\\([a-z=:]*\\)"))
 439           ()
 440         (setq pattern (buffer-substring (match-beginning 1) (match-end 1)))
 441         (setq modifier (if (match-beginning 2) (char-after (match-beginning 2))
 442                          ?s))
 443         (setq commands (buffer-substring (match-beginning 3) (match-end 3)))
 444
 445         ;; The "f:+" command marks everything *but* the matches as read,
 446         ;; so we simply first match everything as read, and then unmark
 447         ;; PATTERN later.
 448         (when (string-match "\\+" commands)
 449           (gnus-kill "from" ".")
 450           (setq commands "m"))
 451
 452         (gnus-kill
 453          (or (cdr (assq modifier mod-to-header)) "subject")
 454          pattern
 455          (if (string-match "m" commands)
 456              '(gnus-summary-tick-article nil " ")
 457            '(gnus-summary-mark-as-read nil "X"))
 458          nil t))
 459       (forward-line 1))))
 460
 461 ;; Kill changes and new format by suggested by JWZ and Sudish Joseph
 462 ;; <joseph@cis.ohio-state.edu>.
 463 (defun gnus-kill (field regexp &optional exe-command all silent)
 464   "If FIELD of an article matches REGEXP, execute COMMAND.
 465 Optional 1st argument COMMAND is default to
 466         (gnus-summary-mark-as-read nil \"X\").
 467 If optional 2nd argument ALL is non-nil, articles marked are also applied to.
 468 If FIELD is an empty string (or nil), entire article body is searched for.
 469 COMMAND must be a Lisp expression or a string representing a key sequence."
 470   ;; We don't want to change current point nor window configuration.
 471   (let ((old-buffer (current-buffer)))
 472     (save-excursion
 473       (save-window-excursion
 474         ;; Selected window must be summary buffer to execute keyboard
 475         ;; macros correctly.  See command_loop_1.
 476         (switch-to-buffer gnus-summary-buffer 'norecord)
 477         (goto-char (point-min))         ;From the beginning.
 478         (let ((kill-list regexp)
 479               (date (current-time-string))
 480               (command (or exe-command '(gnus-summary-mark-as-read
 481                                          nil gnus-kill-file-mark)))
 482               kill kdate prev)
 483           (if (listp kill-list)
 484               ;; It is a list.
 485               (if (not (consp (cdr kill-list)))
 486                   ;; It's of the form (regexp . date).
 487                   (if (zerop (gnus-execute field (car kill-list)
 488                                            command nil (not all)))
 489                       (when (> (days-between date (cdr kill-list))
 490                                gnus-kill-expiry-days)
 491                         (setq regexp nil))
 492                     (setcdr kill-list date))
 493                 (while (setq kill (car kill-list))
 494                   (if (consp kill)
 495                       ;; It's a temporary kill.
 496                       (progn
 497                         (setq kdate (cdr kill))
 498                         (if (zerop (gnus-execute
 499                                     field (car kill) command nil (not all)))
 500                             (when (> (days-between date kdate)
 501                                      gnus-kill-expiry-days)
 502                               ;; Time limit has been exceeded, so we
 503                               ;; remove the match.
 504                               (if prev
 505                                   (setcdr prev (cdr kill-list))
 506                                 (setq regexp (cdr regexp))))
 507                           ;; Successful kill.  Set the date to today.
 508                           (setcdr kill date)))
 509                     ;; It's a permanent kill.
 510                     (gnus-execute field kill command nil (not all)))
 511                   (setq prev kill-list)
 512                   (setq kill-list (cdr kill-list))))
 513             (gnus-execute field kill-list command nil (not all))))))
 514     (switch-to-buffer old-buffer)
 515     (when (and (derived-mode-p 'gnus-kill-file-mode) regexp (not silent))
 516       (gnus-pp-gnus-kill
 517        (nconc (list 'gnus-kill field
 518                     (if (consp regexp) (list 'quote regexp) regexp))
 519               (when (or exe-command all)
 520                 (list (list 'quote exe-command)))
 521               (if all (list t) nil))))))
 522
 523 (defun gnus-pp-gnus-kill (object)
 524   (if (or (not (consp (nth 2 object)))
 525           (not (consp (cdr (nth 2 object))))
 526           (and (eq 'quote (car (nth 2 object)))
 527                (not (consp (cdadr (nth 2 object))))))
 528       (concat "\n" (gnus-prin1-to-string object))
 529     (with-current-buffer (gnus-get-buffer-create "*Gnus PP*")
 530       (buffer-disable-undo)
 531       (erase-buffer)
 532       (insert (format "\n(%S %S\n  '(" (nth 0 object) (nth 1 object)))
 533       (let ((klist (cadr (nth 2 object)))
 534             (first t))
 535         (while klist
 536           (insert (if first (progn (setq first nil) "")  "\n    ")
 537                   (gnus-prin1-to-string (car klist)))
 538           (setq klist (cdr klist))))
 539       (insert ")")
 540       (and (nth 3 object)
 541            (insert "\n  "
 542                    (if (and (consp (nth 3 object))
 543                             (not (eq 'quote (car (nth 3 object)))))
 544                        "'" "")
 545                    (gnus-prin1-to-string (nth 3 object))))
 546       (when (nth 4 object)
 547         (insert "\n  t"))
 548       (insert ")")
 549       (prog1
 550           (buffer-string)
 551         (kill-buffer (current-buffer))))))
 552
 553 (defun gnus-execute-1 (function regexp form header)
 554   (save-excursion
 555     (let (did-kill)
 556       (if (null header)
 557           nil                           ;Nothing to do.
 558         (if function
 559             ;; Compare with header field.
 560             (let (value)
 561               (and header
 562                    (progn
 563                      (setq value (funcall function header))
 564                      ;; Number (Lines:) or symbol must be converted to string.
 565                      (unless (stringp value)
 566                        (setq value (gnus-prin1-to-string value)))
 567                      (setq did-kill (string-match regexp value)))
 568                    (cond ((stringp form) ;Keyboard macro.
 569                           (execute-kbd-macro form))
 570                          ((functionp form)
 571                           (funcall form))
 572                          (t
 573                           (eval form)))))
 574           ;; Search article body.
 575           (let ((gnus-current-article nil) ;Save article pointer.
 576                 (gnus-last-article nil)
 577                 (gnus-break-pages nil)  ;No need to break pages.
 578                 (gnus-mark-article-hook nil)) ;Inhibit marking as read.
 579             (gnus-message
 580              6 "Searching for article: %d..." (mail-header-number header))
 581             (gnus-article-setup-buffer)
 582             (gnus-article-prepare (mail-header-number header) t)
 583             (when (with-current-buffer gnus-article-buffer
 584                     (goto-char (point-min))
 585                     (setq did-kill (re-search-forward regexp nil t)))
 586               (cond ((stringp form)     ;Keyboard macro.
 587                      (execute-kbd-macro form))
 588                     ((functionp form)
 589                      (funcall form))
 590                     (t
 591                      (eval form)))))))
 592       did-kill)))
 593
 594 (defun gnus-execute (field regexp form &optional backward unread)
 595   "If FIELD of article header matches REGEXP, execute Lisp FORM (or a string).
 596 If FIELD is an empty string (or nil), entire article body is searched for.
 597 If optional 1st argument BACKWARD is non-nil, do backward instead.
 598 If optional 2nd argument UNREAD is non-nil, articles which are
 599 marked as read or ticked are ignored."
 600   (save-excursion
 601     (let ((killed-no 0)
 602           function article header extras)
 603       (cond
 604        ;; Search body.
 605        ((or (null field)
 606             (string-equal field ""))
 607         (setq function nil))
 608        ;; Get access function of header field.
 609        ((cond ((fboundp
 610                 (setq function
 611                       (intern-soft
 612                        (concat "mail-header-" (downcase field)))))
 613                (setq function `(lambda (h) (,function h))))
 614               ((when (setq extras
 615                            (member (downcase field)
 616                                    (mapcar (lambda (header)
 617                                              (downcase (symbol-name header)))
 618                                            gnus-extra-headers)))
 619                  (setq function
 620                        `(lambda (h)
 621                           (gnus-extra-header
 622                            (quote ,(nth (- (length gnus-extra-headers)
 623                                            (length extras))
 624                                         gnus-extra-headers))
 625                            h)))))))
 626        ;; Signal error.
 627        (t
 628         (error "Unknown header field: \"%s\"" field)))
 629       ;; Starting from the current article.
 630       (while (or
 631               ;; First article.
 632               (and (not article)
 633                    (setq article (gnus-summary-article-number)))
 634               ;; Find later articles.
 635               (setq article
 636                     (gnus-summary-search-forward unread nil backward)))
 637         (and (or (null gnus-newsgroup-kill-headers)
 638                  (memq article gnus-newsgroup-kill-headers))
 639              (vectorp (setq header (gnus-summary-article-header article)))
 640              (gnus-execute-1 function regexp form header)
 641              (setq killed-no (1+ killed-no))))
 642       ;; Return the number of killed articles.
 643       killed-no)))
 644
 645 ;;;###autoload
 646 (defalias 'gnus-batch-kill 'gnus-batch-score)
 647 ;;;###autoload
 648 (defun gnus-batch-score ()
 649   "Run batched scoring.
 650 Usage: emacs -batch -l ~/.emacs -l gnus -f gnus-batch-score"
 651   (interactive)
 652   (let* ((gnus-newsrc-options-n
 653           (gnus-newsrc-parse-options
 654            (concat "options -n "
 655                    (mapconcat 'identity command-line-args-left " "))))
 656          (gnus-expert-user t)
 657          (mail-sources nil)
 658          (gnus-use-dribble-file nil)
 659          (gnus-batch-mode t)
 660          info group newsrc unread
 661          ;; Disable verbose message.
 662          gnus-novice-user gnus-large-newsgroup
 663          gnus-options-subscribe gnus-auto-subscribed-groups
 664          gnus-options-not-subscribe)
 665     ;; Eat all arguments.
 666     (setq command-line-args-left nil)
 667     (gnus-slave)
 668     ;; Apply kills to specified newsgroups in command line arguments.
 669     (setq newsrc (cdr gnus-newsrc-alist))
 670     (while (setq info (pop newsrc))
 671       (setq group (gnus-info-group info)
 672             unread (gnus-group-unread group))
 673       (when (and (<= (gnus-info-level info) gnus-level-subscribed)
 674                  (and unread
 675                       (or (eq unread t)
 676                           (not (zerop unread)))))
 677         (ignore-errors
 678           (gnus-summary-read-group group nil t nil t))
 679         (when (eq (current-buffer) (get-buffer gnus-summary-buffer))
 680           (gnus-summary-exit))))
 681     ;; Exit Emacs.
 682     (switch-to-buffer gnus-group-buffer)
 683     (gnus-group-save-newsrc)))
 684
 685 (provide 'gnus-kill)
 686
 687 ;;; gnus-kill.el ends here