(help-xref-forward-stack): Doc fix.

[bpt/emacs.git] / lisp / help-mode.el

diff --git a/lisp/help-mode.el b/lisp/help-mode.el
index 95ae547..83313fd 100644 (file)
--- a/lisp/help-mode.el
+++ b/lisp/help-mode.el
@@ -8,10 +8,10 @@
 
 ;; This file is part of GNU Emacs.
 
-;; GNU Emacs is free software; you can redistribute it and/or modify
+;; 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 3, or (at your option)
-;; any later version.
+;; the Free Software Foundation, either version 3 of the License, 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
@@ -19,9 +19,7 @@
 ;; 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., 51 Franklin Street, Fifth Floor,
-;; Boston, MA 02110-1301, USA.
+;; along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.
 
 ;;; Commentary:
 
@@ -69,7 +67,7 @@ To use the element, do (apply FUNCTION ARGS) then goto the point.")
 (make-variable-buffer-local 'help-xref-stack)
 
 (defvar help-xref-forward-stack nil
-  "The stack of used to navigate help forwards  after using the back button.
+  "A stack used to navigate help forwards after using the back button.
 Used by `help-follow' and `help-xref-go-forward'.
 An element looks like (POSITION FUNCTION ARGS...).
 To use the element, do (apply FUNCTION ARGS) then goto the point.")
@@ -159,6 +157,12 @@ The format is (FUNCTION ARGS...).")
   'help-function #'help-xref-go-forward
   'help-echo (purecopy "mouse-2, RET: move forward to next help buffer"))
 
+(define-button-type 'help-info-variable
+  :supertype 'help-xref
+  ;; the name of the variable is put before the argument to Info
+  'help-function (lambda (a v) (info v))
+  'help-echo (purecopy "mouse-2, RET: read this Info node"))
+
 (define-button-type 'help-info
   :supertype 'help-xref
   'help-function #'info