Doc fixes related to rmail-automatic-folder-directives.

* mail/rmail.el (rmail-message-filter, rmail-auto-file): Doc fixes.
(rmail-auto-file): Ignore case in the "special" field names,
as mail-fetch-field does for all others.

lisp/ChangeLog

@@ -4,6 +4,10 @@
 
 2011-11-23  Glenn Morris  <rgm@gnu.org>
 
+	* mail/rmail.el (rmail-message-filter, rmail-auto-file): Doc fixes.
+	(rmail-auto-file): Ignore case in the "special" field names,
+	as mail-fetch-field does for all others.
+
 	* mail/rmail.el (rmail-forward):
 	* mail/rmailkwd.el (rmail-set-label):
 	* mail/rmailout.el (rmail-output, rmail-output-as-seen)

lisp/mail/rmail.el

@@ -495,29 +495,36 @@ before obeying `rmail-ignored-headers'."
 			"23.1")
 
 (defcustom rmail-automatic-folder-directives nil
-  "List of directives specifying where to put a message.
+  "List of directives specifying how to automatically file messages.
+Whenever Rmail shows a message in the folder that `rmail-file-name'
+specifies, it calls `rmail-auto-file' to maybe file the message in
+another folder according to this list.  Messages that are already
+marked as `filed', or are in different folders, are left alone.
+
 Each element of the list is of the form:
 
   (FOLDERNAME FIELD REGEXP [ FIELD REGEXP ] ... )
 
-Where FOLDERNAME is the name of a folder to put the message.
-If any of the field regexp's are nil, then it is ignored.
+FOLDERNAME is the name of a folder in which to put the message.
+If FOLDERNAME is nil then Rmail deletes the message, and moves on to
+the next.  If FOLDERNAME is \"/dev/null\", Rmail deletes the message,
+but does not move to the next.
 
-If FOLDERNAME is \"/dev/null\", it is deleted.
-If FOLDERNAME is nil then it is deleted, and skipped.
+FIELD is the name of a header field in the message, such as
+\"subject\" or \"from\".  A FIELD of \"to\" includes all text
+from both the \"to\" and \"cc\" headers.
 
-FIELD is the plain text name of a field in the message, such as
-\"subject\" or \"from\".  A FIELD of \"to\" will automatically include
-all text from the \"cc\" field as well.
+REGEXP is a regular expression to match (case-sensitively) against
+the preceding specified FIELD.
 
-REGEXP is an expression to match in the preceding specified FIELD.
-FIELD/REGEXP pairs continue in the list.
+There may be any number of FIELD/REGEXP pairs.
+All pairs must match for a directive to apply to a message.
+For a given message, Rmail applies only the first matching directive.
 
-examples:
+Examples:
   (\"/dev/null\" \"from\" \"@spam.com\") ; delete all mail from spam.com
   (\"RMS\" \"from\" \"rms@\") ; save all mail from RMS.
-
-Note that this is only applied in the folder specifed by `rmail-file-name'."
+"
   :group 'rmail
   :version "21.1"
   :type '(repeat (sexp :tag "Directive")))
@@ -2941,8 +2948,11 @@ Uses the face specified by `rmail-highlight-face'."
 			(cons overlay rmail-overlay-list))))))))))
 
 (defun rmail-auto-file ()
-  "Automatically move a message into a sub-folder based on criteria.
-Called when a new message is displayed."
+  "Automatically move a message into another sfolder based on criteria.
+This moves messages according to `rmail-automatic-folder-directives'.
+It only does something in the folder that `rmail-file-name' specifies.
+The function `rmail-show-message' calls this whenever it shows a message.
+This leaves a message alone if it already has the `filed' attribute."
   (if (or (zerop rmail-total-messages)
 	  (rmail-message-attr-p rmail-current-message "...F")
 	  (not (string= (buffer-file-name)
@@ -2962,10 +2972,14 @@ Called when a new message is displayed."
 	      directive-loop (cdr (car d)))
 	(while (and (car directive-loop)
 		    (let ((f (cond
-			      ((string= (car directive-loop) "from") from)
-			      ((string= (car directive-loop) "to") to)
-			      ((string= (car directive-loop) "subject") subj)
+			      ((string= (downcase (car directive-loop)) "from")
+			       from)
+			      ((string= (downcase (car directive-loop)) "to")
+			       to)
+			      ((string= (downcase (car directive-loop))
+					"subject") subj)
 			      (t (mail-fetch-field (car directive-loop))))))
+		      ;; FIXME - shouldn't this ignore case?
 		      (and f (string-match (car (cdr directive-loop)) f))))
 	  (setq directive-loop (cdr (cdr directive-loop))))
 	;; If there are no directives left, then it was a complete match.