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+;;; gnus-kill.el --- kill commands for Gnus
+;; Copyright (C) 1995 Free Software Foundation, Inc.
+
+;; Author: Masanobu UMEDA <umerin@flab.flab.fujitsu.junet>
+;;	Lars Magne Ingebrigtsen <larsi@ifi.uio.no>
+;; 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 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, 675 Mass Ave, Cambridge, MA 02139, USA.
+
+;;; Commentary:
+
+;;; Code:
+
+(require 'gnus)
+
+(defvar gnus-kill-file-mode-hook nil
+  "*A hook for Gnus kill file mode.")
+
+(defvar gnus-kill-expiry-days 7
+  "*Number of days before expiring unused kill file entries.")
+
+(defvar gnus-kill-save-kill-file nil
+  "*If non-nil, will save kill files after processing them.")
+
+(defvar gnus-winconf-kill-file nil)
+
+
+
+(defmacro gnus-raise (field expression level)
+  (` (gnus-kill (, field) (, expression)
+		(function (gnus-summary-raise-score (, level))) t)))
+
+(defmacro gnus-lower (field expression level)
+  (` (gnus-kill (, field) (, expression)
+		(function (gnus-summary-raise-score (- (, level)))) t)))
+
+;;;
+;;; Gnus Kill File Mode
+;;;
+
+(defvar gnus-kill-file-mode-map nil)
+
+(if gnus-kill-file-mode-map
+    nil
+  (setq gnus-kill-file-mode-map (copy-keymap emacs-lisp-mode-map))
+  (define-key gnus-kill-file-mode-map 
+    "\C-c\C-k\C-s" 'gnus-kill-file-kill-by-subject)
+  (define-key gnus-kill-file-mode-map
+    "\C-c\C-k\C-a" 'gnus-kill-file-kill-by-author)
+  (define-key gnus-kill-file-mode-map
+    "\C-c\C-k\C-t" 'gnus-kill-file-kill-by-thread)
+  (define-key gnus-kill-file-mode-map 
+    "\C-c\C-k\C-x" 'gnus-kill-file-kill-by-xref)
+  (define-key gnus-kill-file-mode-map
+    "\C-c\C-a" 'gnus-kill-file-apply-buffer)
+  (define-key gnus-kill-file-mode-map
+    "\C-c\C-e" 'gnus-kill-file-apply-last-sexp)
+  (define-key gnus-kill-file-mode-map 
+    "\C-c\C-c" 'gnus-kill-file-exit))
+
+(defun gnus-kill-file-mode ()
+  "Major mode for editing kill files.
+
+If you are using this mode - you probably shouldn't.  Kill files
+perform badly and paint with a pretty broad brush.  Score files, on
+the other hand, are vastly faster (40x speedup) and give you more
+control over what to do.
+
+In addition to Emacs-Lisp Mode, the following commands are available:
+
+\\{gnus-kill-file-mode-map}
+
+  A kill file contains Lisp expressions to be applied to a selected
+newsgroup.  The purpose is to mark articles as read on the basis of
+some set of regexps.  A global kill file is applied to every newsgroup,
+and a local kill file is applied to a specified newsgroup.  Since a
+global kill file is applied to every newsgroup, for better performance
+use a local one.
+
+  A kill file can contain any kind of Emacs Lisp expressions expected
+to be evaluated in the Summary buffer.  Writing Lisp programs for this
+purpose is not so easy because the internal working of Gnus must be
+well-known.  For this reason, Gnus provides a general function which
+does this easily for non-Lisp programmers.
+
+  The `gnus-kill' function executes commands available in Summary Mode
+by their key sequences. `gnus-kill' should be called with FIELD,
+REGEXP and optional COMMAND and ALL.  FIELD is a string representing
+the header field or an empty string.  If FIELD is an empty string, the
+entire article body is searched for.  REGEXP is a string which is
+compared with FIELD value. COMMAND is a string representing a valid
+key sequence in Summary mode or Lisp expression. COMMAND defaults to
+'(gnus-summary-mark-as-read nil \"X\").  Make sure that COMMAND is
+executed in the Summary buffer.  If the second optional argument ALL
+is non-nil, the COMMAND is applied to articles which are already
+marked as read or unread.  Articles which are marked are skipped over
+by default.
+
+  For example, if you want to mark articles of which subjects contain
+the string `AI' as read, a possible kill file may look like:
+
+	(gnus-kill \"Subject\" \"AI\")
+
+  If you want to mark articles with `D' instead of `X', you can use
+the following expression:
+
+	(gnus-kill \"Subject\" \"AI\" \"d\")
+
+In this example it is assumed that the command
+`gnus-summary-mark-as-read-forward' is assigned to `d' in Summary Mode.
+
+  It is possible to delete unnecessary headers which are marked with
+`X' in a kill file as follows:
+
+	(gnus-expunge \"X\")
+
+  If the Summary buffer is empty after applying kill files, Gnus will
+exit the selected newsgroup normally.  If headers which are marked
+with `D' are deleted in a kill file, it is impossible to read articles
+which are marked as read in the previous Gnus sessions.  Marks other
+than `D' should be used for articles which should really be deleted.
+
+Entry to this mode calls emacs-lisp-mode-hook and
+gnus-kill-file-mode-hook with no arguments, if that value is non-nil."
+  (interactive)
+  (kill-all-local-variables)
+  (use-local-map gnus-kill-file-mode-map)
+  (set-syntax-table emacs-lisp-mode-syntax-table)
+  (setq major-mode 'gnus-kill-file-mode)
+  (setq mode-name "Kill")
+  (lisp-mode-variables nil)
+  (run-hooks 'emacs-lisp-mode-hook 'gnus-kill-file-mode-hook))
+
+(defun gnus-kill-file-edit-file (newsgroup)
+  "Begin editing a kill file for NEWSGROUP.
+If NEWSGROUP is nil, the global kill file is selected."
+  (interactive "sNewsgroup: ")
+  (let ((file (gnus-newsgroup-kill-file newsgroup)))
+    (gnus-make-directory (file-name-directory file))
+    ;; Save current window configuration if this is first invocation.
+    (or (and (get-file-buffer file)
+	     (get-buffer-window (get-file-buffer file)))
+	(setq gnus-winconf-kill-file (current-window-configuration)))
+    ;; Hack windows.
+    (let ((buffer (find-file-noselect file)))
+      (cond ((get-buffer-window buffer)
+	     (pop-to-buffer buffer))
+	    ((eq major-mode 'gnus-group-mode)
+	     (gnus-configure-windows 'group) ;Take all windows.
+	     (pop-to-buffer buffer))
+	    ((eq major-mode 'gnus-summary-mode)
+	     (gnus-configure-windows 'article)
+	     (pop-to-buffer gnus-article-buffer)
+	     (bury-buffer gnus-article-buffer)
+	     (switch-to-buffer buffer))
+	    (t				;No good rules.
+	     (find-file-other-window file))))
+    (gnus-kill-file-mode)))
+
+;; Fix by Sudish Joseph <joseph@cis.ohio-state.edu>.
+(defun gnus-kill-set-kill-buffer ()
+  (let* ((file (gnus-newsgroup-kill-file gnus-newsgroup-name))
+	 (buffer (find-file-noselect file)))
+    (set-buffer buffer)
+    (gnus-kill-file-mode)
+    (bury-buffer buffer)))
+
+(defun gnus-kill-file-enter-kill (field regexp)
+  ;; Enter kill file entry.
+  ;; FIELD: String containing the name of the header field to kill.
+  ;; REGEXP: The string to kill.
+  (save-excursion
+    (let (string)
+      (or (eq major-mode 'gnus-kill-file-mode)
+	  (gnus-kill-set-kill-buffer))
+      (current-buffer)
+      (goto-char (point-max))
+      (insert (setq string (format "(gnus-kill %S %S)\n" field regexp)))
+      (gnus-kill-file-apply-string string))))
+    
+(defun gnus-kill-file-kill-by-subject ()
+  "Kill by subject."
+  (interactive)
+  (gnus-kill-file-enter-kill
+   "Subject" 
+   (if (vectorp gnus-current-headers)
+       (regexp-quote 
+	(gnus-simplify-subject (mail-header-subject gnus-current-headers)))
+     "")))
+  
+(defun gnus-kill-file-kill-by-author ()
+  "Kill by author."
+  (interactive)
+  (gnus-kill-file-enter-kill
+   "From" 
+   (if (vectorp gnus-current-headers)
+       (regexp-quote (mail-header-from gnus-current-headers))
+     "")))
+ 
+(defun gnus-kill-file-kill-by-thread ()
+  "Kill by author."
+  (interactive "p")
+  (gnus-kill-file-enter-kill
+   "References" 
+   (if (vectorp gnus-current-headers)
+       (regexp-quote (mail-header-id gnus-current-headers))
+     "")))
+ 
+(defun gnus-kill-file-kill-by-xref ()
+  "Kill by Xref."
+  (interactive)
+  (let ((xref (and (vectorp gnus-current-headers) 
+		   (mail-header-xref gnus-current-headers)))
+	(start 0)
+	group)
+    (if xref
+	(while (string-match " \\([^ \t]+\\):" xref start)
+	  (setq start (match-end 0))
+	  (if (not (string= 
+		    (setq group 
+			  (substring xref (match-beginning 1) (match-end 1)))
+		    gnus-newsgroup-name))
+	      (gnus-kill-file-enter-kill 
+	       "Xref" (concat " " (regexp-quote group) ":"))))
+      (gnus-kill-file-enter-kill "Xref" ""))))
+
+(defun gnus-kill-file-raise-followups-to-author (level)
+  "Raise score for all followups to the current author."
+  (interactive "p")
+  (let ((name (mail-header-from gnus-current-headers))
+	string)
+    (save-excursion
+      (gnus-kill-set-kill-buffer)
+      (goto-char (point-min))
+      (setq name (read-string (concat "Add " level
+				      " to followup articles to: ")
+			      (regexp-quote name)))
+      (setq 
+       string
+       (format
+	"(gnus-kill %S %S '(gnus-summary-temporarily-raise-by-thread %S))\n"
+	"From" name level))
+      (insert string)
+      (gnus-kill-file-apply-string string))
+    (message "Added temporary score file entry for followups to %s." name)))
+
+(defun gnus-kill-file-apply-buffer ()
+  "Apply current buffer to current newsgroup."
+  (interactive)
+  (if (and gnus-current-kill-article
+	   (get-buffer gnus-summary-buffer))
+      ;; Assume newsgroup is selected.
+      (gnus-kill-file-apply-string (buffer-string))
+    (ding) (message "No newsgroup is selected.")))
+
+(defun gnus-kill-file-apply-string (string)
+  "Apply STRING to current newsgroup."
+  (interactive)
+  (let ((string (concat "(progn \n" string "\n)")))
+    (save-excursion
+      (save-window-excursion
+	(pop-to-buffer gnus-summary-buffer)
+	(eval (car (read-from-string string)))))))
+
+(defun gnus-kill-file-apply-last-sexp ()
+  "Apply sexp before point in current buffer to current newsgroup."
+  (interactive)
+  (if (and gnus-current-kill-article
+	   (get-buffer gnus-summary-buffer))
+      ;; Assume newsgroup is selected.
+      (let ((string
+	     (buffer-substring
+	      (save-excursion (forward-sexp -1) (point)) (point))))
+	(save-excursion
+	  (save-window-excursion
+	    (pop-to-buffer gnus-summary-buffer)
+	    (eval (car (read-from-string string))))))
+    (ding) (message "No newsgroup is selected.")))
+
+(defun gnus-kill-file-exit ()
+  "Save a kill file, then return to the previous buffer."
+  (interactive)
+  (save-buffer)
+  (let ((killbuf (current-buffer)))
+    ;; We don't want to return to article buffer.
+    (and (get-buffer gnus-article-buffer)
+	 (bury-buffer gnus-article-buffer))
+    ;; Delete the KILL file windows.
+    (delete-windows-on killbuf)
+    ;; Restore last window configuration if available.
+    (and gnus-winconf-kill-file
+	 (set-window-configuration gnus-winconf-kill-file))
+    (setq gnus-winconf-kill-file nil)
+    ;; Kill the KILL file buffer.  Suggested by tale@pawl.rpi.edu.
+    (kill-buffer killbuf)))
+
+;; For kill files
+
+(defun gnus-Newsgroup-kill-file (newsgroup)
+  "Return the name of a kill file for NEWSGROUP.
+If NEWSGROUP is nil, return the global kill file instead."
+  (cond ((or (null newsgroup)
+	     (string-equal newsgroup ""))
+	 ;; The global kill file is placed at top of the directory.
+	 (expand-file-name gnus-kill-file-name
+			   (or gnus-kill-files-directory "~/News")))
+	(gnus-use-long-file-name
+	 ;; Append ".KILL" to capitalized newsgroup name.
+	 (expand-file-name (concat (gnus-capitalize-newsgroup newsgroup)
+				   "." gnus-kill-file-name)
+			   (or gnus-kill-files-directory "~/News")))
+	(t
+	 ;; Place "KILL" under the hierarchical directory.
+	 (expand-file-name (concat (gnus-newsgroup-directory-form newsgroup)
+				   "/" gnus-kill-file-name)
+			   (or gnus-kill-files-directory "~/News")))))
+
+(defun gnus-expunge (marks)
+  "Remove lines marked with MARKS."
+  (save-excursion
+    (set-buffer gnus-summary-buffer)
+    (gnus-summary-remove-lines-marked-with marks)))
+
+(defun gnus-apply-kill-file-internal ()
+  "Apply a kill file to the current newsgroup.
+Returns the number of articles marked as read."
+  (let* ((kill-files (list (gnus-newsgroup-kill-file nil)
+			   (gnus-newsgroup-kill-file gnus-newsgroup-name)))
+	 (unreads (length gnus-newsgroup-unreads))
+	 (gnus-summary-inhibit-highlight t)
+	 beg)
+    (setq gnus-newsgroup-kill-headers nil)
+    (or gnus-newsgroup-headers-hashtb-by-number
+	(gnus-make-headers-hashtable-by-number))
+    ;; If there are any previously scored articles, we remove these
+    ;; from the `gnus-newsgroup-headers' list that the score functions
+    ;; will see. This is probably pretty wasteful when it comes to
+    ;; conses, but is, I think, faster than having to assq in every
+    ;; single score function.
+    (let ((files kill-files))
+      (while files
+	(if (file-exists-p (car files))
+	    (let ((headers gnus-newsgroup-headers))
+	      (if gnus-kill-killed
+		  (setq gnus-newsgroup-kill-headers
+			(mapcar (lambda (header) (mail-header-number header))
+				headers))
+		(while headers
+		  (or (gnus-member-of-range 
+		       (mail-header-number (car headers)) 
+		       gnus-newsgroup-killed)
+		      (setq gnus-newsgroup-kill-headers 
+			    (cons (mail-header-number (car headers))
+				  gnus-newsgroup-kill-headers)))
+		  (setq headers (cdr headers))))
+	      (setq files nil))
+ 	  (setq files (cdr files)))))
+    (if (not gnus-newsgroup-kill-headers)
+	()
+      (save-window-excursion
+	(save-excursion
+	  (while kill-files
+	    (if (not (file-exists-p (car kill-files)))
+		()
+	      (message "Processing kill file %s..." (car kill-files))
+	      (find-file (car kill-files))
+	      (gnus-add-current-to-buffer-list)
+	      (goto-char (point-min))
+
+	      (if (consp (condition-case nil (read (current-buffer)) 
+			   (error nil)))
+		  (gnus-kill-parse-gnus-kill-file)
+		(gnus-kill-parse-rn-kill-file))
+	    
+	      (message "Processing kill file %s...done" (car kill-files)))
+	    (setq kill-files (cdr kill-files)))))
+
+      (gnus-set-mode-line 'summary)
+
+      (if beg
+	  (let ((nunreads (- unreads (length gnus-newsgroup-unreads))))
+	    (or (eq nunreads 0)
+		(message "Marked %d articles as read" nunreads))
+	    nunreads)
+	0))))
+
+;; Parse a Gnus killfile.
+(defun gnus-score-insert-help (string alist idx)
+  (save-excursion
+    (pop-to-buffer "*Score Help*")
+    (buffer-disable-undo (current-buffer))
+    (erase-buffer)
+    (insert string ":\n\n")
+    (while alist
+      (insert (format " %c: %s\n" (car (car alist)) (nth idx (car alist))))
+      (setq alist (cdr alist)))))
+
+(defun gnus-kill-parse-gnus-kill-file ()
+  (goto-char (point-min))
+  (gnus-kill-file-mode)
+  (let (beg form)
+    (while (progn 
+	     (setq beg (point))
+	     (setq form (condition-case () (read (current-buffer))
+			  (error nil))))
+      (or (listp form)
+	  (error "Illegal kill entry (possibly rn kill file?): %s" form))
+      (if (or (eq (car form) 'gnus-kill)
+	      (eq (car form) 'gnus-raise)
+	      (eq (car form) 'gnus-lower))
+	  (progn
+	    (delete-region beg (point))
+	    (insert (or (eval form) "")))
+	(save-excursion
+	  (set-buffer gnus-summary-buffer)
+	  (condition-case () (eval form) (error nil)))))
+    (and (buffer-modified-p) 
+	 gnus-kill-save-kill-file
+	 (save-buffer))
+    (set-buffer-modified-p nil)))
+
+;; Parse an rn killfile.
+(defun gnus-kill-parse-rn-kill-file ()
+  (goto-char (point-min))
+  (gnus-kill-file-mode)
+  (let ((mod-to-header
+	 '((?a . "")
+	   (?h . "")
+	   (?f . "from")
+	   (?: . "subject")))
+	(com-to-com
+	 '((?m . " ")
+	   (?j . "X")))
+	pattern modifier commands)
+    (while (not (eobp))
+      (if (not (looking-at "[ \t]*/\\([^/]*\\)/\\([ahfcH]\\)?:\\([a-z=:]*\\)"))
+	  ()
+	(setq pattern (buffer-substring (match-beginning 1) (match-end 1)))
+	(setq modifier (if (match-beginning 2) (char-after (match-beginning 2))
+			 ?s))
+	(setq commands (buffer-substring (match-beginning 3) (match-end 3)))
+
+	;; The "f:+" command marks everything *but* the matches as read,
+	;; so we simply first match everything as read, and then unmark
+	;; PATTERN later. 
+	(and (string-match "\\+" commands)
+	     (progn
+	       (gnus-kill "from" ".")
+	       (setq commands "m")))
+
+	(gnus-kill 
+	 (or (cdr (assq modifier mod-to-header)) "subject")
+	 pattern 
+	 (if (string-match "m" commands) 
+	     '(gnus-summary-mark-as-unread nil " ")
+	   '(gnus-summary-mark-as-read nil "X")) 
+	 nil t))
+      (forward-line 1))))
+
+;; Kill changes and new format by suggested by JWZ and Sudish Joseph
+;; <joseph@cis.ohio-state.edu>.  
+(defun gnus-kill (field regexp &optional exe-command all silent)
+  "If FIELD of an article matches REGEXP, execute COMMAND.
+Optional 1st argument COMMAND is default to
+	(gnus-summary-mark-as-read nil \"X\").
+If optional 2nd argument ALL is non-nil, articles marked are also applied to.
+If FIELD is an empty string (or nil), entire article body is searched for.
+COMMAND must be a lisp expression or a string representing a key sequence."
+  ;; We don't want to change current point nor window configuration.
+  (let ((old-buffer (current-buffer)))
+    (save-excursion
+      (save-window-excursion
+	;; Selected window must be summary buffer to execute keyboard
+	;; macros correctly. See command_loop_1.
+	(switch-to-buffer gnus-summary-buffer 'norecord)
+	(goto-char (point-min))		;From the beginning.
+	(let ((kill-list regexp)
+	      (date (current-time-string))
+	      (command (or exe-command '(gnus-summary-mark-as-read 
+					 nil gnus-kill-file-mark)))
+	      kill kdate prev)
+	  (if (listp kill-list)
+	      ;; It is a list.
+	      (if (not (consp (cdr kill-list)))
+		  ;; It's on the form (regexp . date).
+		  (if (zerop (gnus-execute field (car kill-list) 
+					   command nil (not all)))
+		      (if (> (gnus-days-between date (cdr kill-list))
+			     gnus-kill-expiry-days)
+			  (setq regexp nil))
+		    (setcdr kill-list date))
+		(while (setq kill (car kill-list))
+		  (if (consp kill)
+		      ;; It's a temporary kill.
+		      (progn
+			(setq kdate (cdr kill))
+			(if (zerop (gnus-execute 
+				    field (car kill) command nil (not all)))
+			    (if (> (gnus-days-between date kdate)
+				   gnus-kill-expiry-days)
+				;; Time limit has been exceeded, so we
+				;; remove the match.
+				(if prev
+				    (setcdr prev (cdr kill-list))
+				  (setq regexp (cdr regexp))))
+			  ;; Successful kill. Set the date to today.
+			  (setcdr kill date)))
+		    ;; It's a permanent kill.
+		    (gnus-execute field kill command nil (not all)))
+		  (setq prev kill-list)
+		  (setq kill-list (cdr kill-list))))
+	    (gnus-execute field kill-list command nil (not all))))))
+    (switch-to-buffer old-buffer)
+    (if (and (eq major-mode 'gnus-kill-file-mode) regexp (not silent))
+	(gnus-pp-gnus-kill
+	 (nconc (list 'gnus-kill field 
+		      (if (consp regexp) (list 'quote regexp) regexp))
+		(if (or exe-command all) (list (list 'quote exe-command)))
+		(if all (list t) nil))))))
+
+(defun gnus-pp-gnus-kill (object)
+  (if (or (not (consp (nth 2 object)))
+	  (not (consp (cdr (nth 2 object))))
+	  (and (eq 'quote (car (nth 2 object)))
+	       (not (consp (cdr (car (cdr (nth 2 object))))))))
+      (concat "\n" (prin1-to-string object))
+    (save-excursion
+      (set-buffer (get-buffer-create "*Gnus PP*"))
+      (buffer-disable-undo (current-buffer))
+      (erase-buffer)
+      (insert (format "\n(%S %S\n  '(" (nth 0 object) (nth 1 object)))
+      (let ((klist (car (cdr (nth 2 object))))
+	    (first t))
+	(while klist
+	  (insert (if first (progn (setq first nil) "")  "\n    ")
+		  (prin1-to-string (car klist)))
+	  (setq klist (cdr klist))))
+      (insert ")")
+      (and (nth 3 object)
+	   (insert "\n  " 
+		   (if (and (consp (nth 3 object))
+			    (not (eq 'quote (car (nth 3 object))))) 
+		       "'" "")
+		   (prin1-to-string (nth 3 object))))
+      (and (nth 4 object)
+	   (insert "\n  t"))
+      (insert ")")
+      (prog1
+	  (buffer-substring (point-min) (point-max))
+	(kill-buffer (current-buffer))))))
+
+(defun gnus-execute-1 (function regexp form header)
+  (save-excursion
+    (let (did-kill)
+      (if (null header)
+	  nil				;Nothing to do.
+	(if function
+	    ;; Compare with header field.
+	    (let (value)
+	      (and header
+		   (progn
+		     (setq value (funcall function header))
+		     ;; Number (Lines:) or symbol must be converted to string.
+		     (or (stringp value)
+			 (setq value (prin1-to-string value)))
+		     (setq did-kill (string-match regexp value)))
+		   (if (stringp form)	;Keyboard macro.
+		       (execute-kbd-macro form)
+		     (funcall form))))
+	  ;; Search article body.
+	  (let ((gnus-current-article nil) ;Save article pointer.
+		(gnus-last-article nil)
+		(gnus-break-pages nil)	;No need to break pages.
+		(gnus-mark-article-hook nil)) ;Inhibit marking as read.
+	    (message "Searching for article: %d..." (mail-header-number header))
+	    (gnus-article-setup-buffer)
+	    (gnus-article-prepare (mail-header-number header) t)
+	    (if (save-excursion
+		  (set-buffer gnus-article-buffer)
+		  (goto-char (point-min))
+		  (setq did-kill (re-search-forward regexp nil t)))
+		(if (stringp form)	;Keyboard macro.
+		    (execute-kbd-macro form)
+		  (eval form))))))
+      did-kill)))
+
+(defun gnus-execute (field regexp form &optional backward ignore-marked)
+  "If FIELD of article header matches REGEXP, execute lisp FORM (or a string).
+If FIELD is an empty string (or nil), entire article body is searched for.
+If optional 1st argument BACKWARD is non-nil, do backward instead.
+If optional 2nd argument IGNORE-MARKED is non-nil, articles which are
+marked as read or ticked are ignored."
+  (save-excursion
+    (let ((killed-no 0)
+	  function article header)
+      (if (or (null field) (string-equal field ""))
+	  (setq function nil)
+	;; Get access function of header filed.
+	(setq function (intern-soft (concat "gnus-header-" (downcase field))))
+	(if (and function (fboundp function))
+	    (setq function (symbol-function function))
+	  (error "Unknown header field: \"%s\"" field))
+	;; Make FORM funcallable.
+	(if (and (listp form) (not (eq (car form) 'lambda)))
+	    (setq form (list 'lambda nil form))))
+      ;; Starting from the current article.
+      (while (or (and (not article)
+		      (setq article (gnus-summary-article-number))
+		      t)
+		 (setq article 
+		       (gnus-summary-search-subject 
+			backward (not ignore-marked))))
+	(and (or (null gnus-newsgroup-kill-headers)
+		 (memq article gnus-newsgroup-kill-headers))
+	     (vectorp (setq header (gnus-get-header-by-number article)))
+	     (gnus-execute-1 function regexp form header)
+	     (setq killed-no (1+ killed-no))))
+      killed-no)))
+