master 38751a8: Add 'n'/'p' key bindings in *Help* buffers

[Lars Ingebrigtsen]

branch: master
commit 38751a8585bf320983b78e0b654c1ffc9addbd2f
Author: Lars Ingebrigtsen <larsi@gnus.org>
Commit: Lars Ingebrigtsen <larsi@gnus.org>

    Add 'n'/'p' key bindings in *Help* buffers
    
    * lisp/help-mode.el (help-goto-previous-page): New command and key
    binding.
    (help-goto-previous-page): Ditto.
---
 doc/emacs/help.texi |  8 ++++++++
 etc/NEWS            |  4 ++++
 lisp/help-mode.el   | 22 ++++++++++++++++++++++
 3 files changed, 34 insertions(+)

diff --git a/doc/emacs/help.texi b/doc/emacs/help.texi
index d1329d5..4a6d20e 100644
--- a/doc/emacs/help.texi
+++ b/doc/emacs/help.texi
@@ -459,6 +459,14 @@ Move point back to the previous hyperlink 
(@code{backward-button}).
 @item mouse-1
 @itemx mouse-2
 Follow a hyperlink that you click on.
+@item n
+@itemx p
+Some help pages (like the list of key bindings you get with @kbd{C-h
+b}) are divided into pages (by the @samp{^L} character).  The @kbd{n}
+(@code{help-goto-next-page}) command will take you to the start of the
+next page, and the @kbd{p} (@code{help-goto-previous-page}) command
+will take you to the start of the previous page, or (if point isn't at
+the start of the current page) to the start of the current page.
 @item C-c C-c
 Show all documentation about the symbol at point
 (@code{help-follow-symbol}).
diff --git a/etc/NEWS b/etc/NEWS
index 546f8d1..e7360d2 100644
--- a/etc/NEWS
+++ b/etc/NEWS
@@ -53,6 +53,10 @@ time.
 Jumping to source from "*Help*" buffer moves the point when the source
 buffer is already open.  Now, the old point is pushed to mark ring.
 
++++
+*** New key bindings in *Help* buffers: 'n' and 'p'.
+These will take you (respectively) to the next and previous "page".
+
 ** Fonts
 
 ---
diff --git a/lisp/help-mode.el b/lisp/help-mode.el
index 53acbf9..83e783b 100644
--- a/lisp/help-mode.el
+++ b/lisp/help-mode.el
@@ -35,6 +35,8 @@
   (let ((map (make-sparse-keymap)))
     (set-keymap-parent map (make-composed-keymap button-buffer-map
                                                  special-mode-map))
+    (define-key map "n" 'help-goto-next-page)
+    (define-key map "p" 'help-goto-previous-page)
     (define-key map "l" 'help-go-back)
     (define-key map "r" 'help-go-forward)
     (define-key map "\C-c\C-b" 'help-go-back)
@@ -806,6 +808,26 @@ See `help-make-xrefs'."
       (help-xref-go-forward (current-buffer))
     (user-error "No next help buffer")))
 
+(defun help-goto-next-page ()
+  "Go to the next page (if any) in the current buffer.
+The help buffers are divided into \"pages\" by the ^L character."
+  (interactive)
+  (push-mark)
+  (forward-page)
+  (unless (eobp)
+    (forward-line 1)))
+
+(defun help-goto-previous-page ()
+  "Go to the previous page (if any) in the current buffer.
+(If not at the start of a page, go to the start of the current page.)
+
+The help buffers are divided into \"pages\" by the ^L character."
+  (interactive)
+  (push-mark)
+  (backward-page (if (looking-back "\f\n" (- (point) 5)) 2 1))
+  (unless (bobp)
+    (forward-line 1)))
+
 (defun help-view-source ()
   "View the source of the current help item."
   (interactive nil help-mode)