(menu-bar-options-menu): Delete "Syntax

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

diff --git a/lisp/help-mode.el b/lisp/help-mode.el
index 831db8c..a2e7fb8 100644 (file)
--- a/lisp/help-mode.el
+++ b/lisp/help-mode.el
@@ -1,7 +1,7 @@
 ;;; help-mode.el --- `help-mode' used by *Help* buffers
 
-;; Copyright (C) 1985, 1986, 1993, 1994, 1998, 1999, 2000, 2001, 2002, 2004
-;;   Free Software Foundation, Inc.
+;; Copyright (C) 1985, 1986, 1993, 1994, 1998, 1999, 2000, 2001, 2002,
+;;   2003, 2004, 2005 Free Software Foundation, Inc.
 
 ;; Maintainer: FSF
 ;; Keywords: help, internal
@@ -126,7 +126,12 @@ The format is (FUNCTION ARGS...).")
 (define-button-type 'help-info
   :supertype 'help-xref
   'help-function #'info
-  'help-echo (purecopy"mouse-2, RET: read this Info node"))
+  'help-echo (purecopy "mouse-2, RET: read this Info node"))
+
+(define-button-type 'help-url
+  :supertype 'help-xref
+  'help-function #'browse-url
+  'help-echo (purecopy "mouse-2, RET: view this URL in a browser"))
 
 (define-button-type 'help-customize-variable
   :supertype 'help-xref
@@ -257,6 +262,10 @@ when help commands related to multilingual environment (e.g.,
   (purecopy "\\<[Ii]nfo[ \t\n]+\\(node\\|anchor\\)[ \t\n]+`\\([^']+\\)'")
   "Regexp matching doc string references to an Info node.")
 
+(defconst help-xref-url-regexp
+  (purecopy "\\<[Uu][Rr][Ll][ \t\n]+`\\([^']+\\)'")
+  "Regexp matching doc string references to a URL.")
+
 ;;;###autoload
 (defun help-setup-xref (item interactive-p)
   "Invoked from commands using the \"*Help*\" buffer to install some xref info.
@@ -338,6 +347,11 @@ that."
                      (unless (string-match "^([^)]+)" data)
                        (setq data (concat "(emacs)" data))))
                    (help-xref-button 2 'help-info data))))
+              ;; URLs
+              (save-excursion
+                (while (re-search-forward help-xref-url-regexp nil t)
+                  (let ((data (match-string 1)))
+                   (help-xref-button 1 'help-url data))))
              ;; Mule related keywords.  Do this before trying
              ;; `help-xref-symbol-regexp' because some of Mule
              ;; keywords have variable or function definitions.