(tags-add-tables): Change default value to 'ask-user; update doc.

(visit-tags-table-buffer): If tags-add-tables is nil, never add to current
list; if t, always; if non-nil, non-t, ask user.

diff --git a/lisp/progmodes/etags.el b/lisp/progmodes/etags.el
index 378965b2e08bb01037fd02bc62030f54b240d22f..969927fbe86ecc7726b04f213c5d023bf76bae54 100644 (file)
--- a/lisp/progmodes/etags.el
+++ b/lisp/progmodes/etags.el
@@ -42,9 +42,11 @@ To switch to a new list of tags tables, setting this variable is sufficient.
 If you set this variable, do not also set `tags-file-name'.
 Use the `etags' program to make a tags table file.")
 
-(defvar tags-add-tables nil
-  "*Non-nil means always add a new tags table to the current list.
-This eliminates the need to ask the user whether to add a new tags table
+;;;###autoload
+(defvar tags-add-tables 'ask-user
+  "*T means always add a new tags table to the current list.
+Nil means never add to the current list; always start a new list.
+Non-nil but not t says to ask the user whether to add a new tags table
 to the current list (as opposed to starting a new list).")
 
 (defvar tags-table-list-pointer nil
@@ -480,10 +482,11 @@ Returns t if it visits a tags table, or nil if there are no more in the list."
 
                          ;; Not found in any existing set.
                          (if (and tags-table-list
-                                  (or tags-add-tables
-                                      (y-or-n-p
-                                       (concat "Keep current list of "
-                                               "tags tables also? "))))
+                                  (or (eq t tags-add-tables)
+                                      (and tags-add-tables
+                                           (y-or-n-p
+                                            (concat "Keep current list of "
+                                                    "tags tables also? ")))))
                              ;; Add it to the current list.
                              (setq tags-table-list (cons tags-file-name
                                                          tags-table-list))