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+;;; gnus-mlspl.el --- a group params-based mail splitting mechanism
+
+;; Copyright (C) 1998, 1999, 2000 Free Software Foundation, Inc.
+
+;; Author: Alexandre Oliva <oliva@lsd.ic.unicamp.br>
+;; Keywords: news, mail
+
+;; 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.
+
+(require 'gnus)
+(require 'gnus-sum)
+(require 'gnus-group)
+(require 'nnmail)
+
+(defvar gnus-group-split-updated-hook nil
+  "Hook called just after nnmail-split-fancy is updated by gnus-group-split-update.")
+
+(defvar gnus-group-split-default-catch-all-group "mail.misc"
+  "Group used by gnus-group-split and gnus-group-split-update as default catch-all group.")
+
+;;;###autoload
+(defun gnus-group-split-setup (&optional auto-update catch-all)
+  "Set up the split for nnmail-split-fancy.
+Sets things up so that nnmail-split-fancy is used for mail
+splitting, and defines the variable nnmail-split-fancy according with
+group parameters.
+
+If AUTO-UPDATE is non-nil (prefix argument accepted, if called
+interactively), it makes sure nnmail-split-fancy is re-computed before
+getting new mail, by adding gnus-group-split-update to
+nnmail-pre-get-new-mail-hook."
+  (interactive "P")
+  (setq nnmail-split-methods 'nnmail-split-fancy)
+  (when catch-all
+    (setq gnus-group-split-default-catch-all-group catch-all))
+  (gnus-group-split-update)
+  (when auto-update
+    (add-hook 'nnmail-pre-get-new-mail-hook 'gnus-group-split-update)))
+
+;;;###autoload
+(defun gnus-group-split-update (&optional catch-all)
+  "Computes nnmail-split-fancy from group params.
+It does this by calling \(gnus-group-split-fancy nil nil DEFAULTGROUP)."
+  (interactive)
+  (setq nnmail-split-fancy
+	(gnus-group-split-fancy
+	 nil nil (or catch-all gnus-group-split-default-catch-all-group)))
+  (run-hooks 'gnus-group-split-updated-hook))
+
+;;;###autoload
+(defun gnus-group-split ()
+  "Uses information from group parameters in order to split mail.
+See gnus-group-split-fancy for more information.
+
+If no group is defined as catch-all, the value of
+gnus-group-split-default-catch-all-group is used.
+
+gnus-group-split is a valid value for nnmail-split-methods."
+  (let (nnmail-split-fancy)
+    (gnus-group-split-update
+     gnus-group-split-default-catch-all-group)
+    (nnmail-split-fancy)))
+
+;;;###autoload
+(defun gnus-group-split-fancy
+  (&optional groups no-crosspost catch-all)
+  "Uses information from group parameters in order to split mail.  It
+can be embedded into nnmail-split-fancy lists with the SPLIT
+
+\(: gnus-group-split-fancy GROUPS NO-CROSSPOST CATCH-ALL\)
+
+GROUPS may be a regular expression or a list of group names, that will
+be used to select candidate groups.  If it is ommited or nil, all
+existing groups are considered.
+
+if NO-CROSSPOST is ommitted or nil, a & split will be returned,
+otherwise, a | split, that does not allow crossposting, will be
+returned.
+
+if CATCH-ALL is not nil, and there is no selected group whose
+SPLIT-REGEXP matches the empty string, nor is there a selected group
+whose SPLIT-SPEC is 'catch-all, this group name will be appended to
+the returned SPLIT list, as the last element in a '| SPLIT.
+
+For each selected group, a SPLIT is composed like this: if SPLIT-SPEC
+is specified, this split is returned as-is (unless it is nil: in this
+case, the group is ignored).  Otherwise, if TO-ADDRESS, TO-LIST and/or
+EXTRA-ALIASES are specified, a regexp that matches any of them is
+constructed (extra-aliases may be a list).  Additionally, if
+SPLIT-REGEXP is specified, the regexp will be extended so that it
+matches this regexp too, and if SPLIT-EXCLUDE is specified, RESTRICT
+clauses will be generated.
+
+For example, given the following group parameters:
+
+nnml:mail.bar:
+\((to-address . \"bar@femail.com\")
+ (split-regexp . \".*@femail\\\\.com\"))
+nnml:mail.foo:
+\((to-list . \"foo@nowhere.gov\")
+ (extra-aliases \"foo@localhost\" \"foo-redist@home\")
+ (split-exclude \"bugs-foo\" \"rambling-foo\")
+ (admin-address . \"foo-request@nowhere.gov\"))
+nnml:mail.others:
+\((split-spec . catch-all))
+
+Calling (gnus-group-split-fancy nil nil \"mail.misc\") returns:
+
+\(| (& (any \"\\\\(bar@femail\\\\.com\\\\|.*@femail\\\\.com\\\\)\"
+	   \"mail.bar\")
+      (any \"\\\\(foo@nowhere\\\\.gov\\\\|foo@localhost\\\\|foo-redist@home\\\\)\"
+           - \"bugs-foo\" - \"rambling-foo\" \"mail.foo\"))
+   \"mail.others\")"
+  (let* ((newsrc (cdr gnus-newsrc-alist))
+	 split)
+    (dolist (info newsrc)
+      (let ((group (gnus-info-group info))
+	    (params (gnus-info-params info)))
+	;; For all GROUPs that match the specified GROUPS
+	(when (or (not groups)
+		  (and (listp groups)
+		       (memq group groups))
+		  (and (stringp groups)
+		       (string-match groups group)))
+	  (let ((split-spec (assoc 'split-spec params)) group-clean)
+	    ;; Remove backend from group name
+	    (setq group-clean (string-match ":" group))
+	    (setq group-clean
+		  (if group-clean
+		      (substring group (1+ group-clean))
+		    group))
+	    (if split-spec
+		(when (setq split-spec (cdr split-spec))
+		  (if (eq split-spec 'catch-all)
+		      ;; Emit catch-all only when requested
+		      (when catch-all
+			(setq catch-all group-clean))
+		    ;; Append split-spec to the main split
+		    (push split-spec split)))
+	      ;; Let's deduce split-spec from other params
+	      (let ((to-address (cdr (assoc 'to-address params)))
+		    (to-list (cdr (assoc 'to-list params)))
+		    (extra-aliases (cdr (assoc 'extra-aliases params)))
+		    (split-regexp (cdr (assoc 'split-regexp params)))
+		    (split-exclude (cdr (assoc 'split-exclude params))))
+		(when (or to-address to-list extra-aliases split-regexp)
+		  ;; regexp-quote to-address, to-list and extra-aliases
+		  ;; and add them all to split-regexp
+		  (setq split-regexp
+			(concat
+			 "\\("
+			 (mapconcat
+			  'identity
+			  (append
+			   (and to-address (list (regexp-quote to-address)))
+			   (and to-list (list (regexp-quote to-list)))
+			   (and extra-aliases
+				(if (listp extra-aliases)
+				    (mapcar 'regexp-quote extra-aliases)
+				  (list extra-aliases)))
+			   (and split-regexp (list split-regexp)))
+			  "\\|")
+			 "\\)"))
+		  ;; Now create the new SPLIT
+		  (push (append
+			 (list 'any split-regexp)
+			 ;; Generate RESTRICTs for SPLIT-EXCLUDEs.
+			 (if (listp split-exclude)
+			     (let ((seq split-exclude)
+				   res)
+			       (while seq
+				 (push (cons '- (pop seq))
+				       res))
+			       (apply #'nconc (nreverse res)))
+			   (list '- split-exclude))
+			 (list group-clean))
+			split)
+		  ;; If it matches the empty string, it is a catch-all
+		  (when (string-match split-regexp "")
+		    (setq catch-all nil)))))))))
+    ;; Add catch-all if not crossposting
+    (if (and catch-all no-crosspost)
+	(push split catch-all))
+    ;; Move it to the tail, while arranging that SPLITs appear in the
+    ;; same order as groups.
+    (setq split (reverse split))
+    ;; Decide whether to accept cross-postings or not.
+    (push (if no-crosspost '| '&) split)
+    ;; Even if we can cross-post, catch-all should not get
+    ;; cross-posts.
+    (if (and catch-all (not no-crosspost))
+	(setq split (list '| split catch-all)))
+    split))
+
+(provide 'gnus-mlspl)