Merge.

diff --cc elpher.el
index a24d056,b21dca5..531b2da
--- 1/elpher.el
--- 2/elpher.el
+++ b/elpher.el
@@@ -214,22 -195,20 +214,25 @@@ special address types, such as 'start f
  
  (defun elpher-address-port (address)
    "Retrieve port from ADDRESS."
 -  (elt address 2))
 +  (elt address 3))
 +
++(defun elpher-address-special-p (address)
++  (not (elpher-address-host address)))
+ 
  ;; Node
  
 -(defun elpher-make-node (parent address getter &optional content pos)
 +(defun elpher-make-node (display-string parent address)
    "Create a node in the gopher page hierarchy.
  
 -PARENT specifies the parent of the node, ADDRESS specifies the address of
 -the gopher page, GETTER provides the getter function used to obtain this
 -page.
 +DISPLAY-STRING records the display string used for the page.
 +
 +PARENT specifies the parent of the node, and ADDRESS specifies the
 +address of the gopher page."
 +  (list display-string parent address))
  
 -The optional arguments CONTENT and POS can be used to fill the cached
 -content and cursor position fields of the node."
 -  (list parent address getter content pos))
 +(defun elpher-node-display-string (node)
 +  "Retrieve the display string of NODE."
 +  (elt node 0))
  
  (defun elpher-node-parent (node)
    "Retrieve the parent node of NODE."
@@@ -355,27 -310,20 +358,27 @@@
          (insert " "))
      (insert (make-string elpher-margin-width ?\s))))
  
 -(defun elpher-insert-index-record (line)
 -  "Insert the index record corresponding to LINE into the current buffer."
 -  (let* ((type (elt line 0))
 -         (fields (split-string (substring line 1) "\t"))
 -         (display-string (elt fields 0))
 -         (selector (elt fields 1))
 -         (host (elt fields 2))
 -         (port (elt fields 3))
 -         (address (elpher-make-address selector host port))
 -         (type-map-entry (alist-get type elpher-type-map)))
 +(defun elpher-node-button-help (node)
 +  "Return a string containing the help text for a button corresponding to NODE."
 +  (let ((address (elpher-node-address node)))
 +    (if (eq (elpher-address-type address) ?h)
 +        (let ((url (cadr (split-string (elpher-address-selector address) "URL:"))))
 +          (format "mouse-1, RET: open url '%s'" url))
 +      (format "mouse-1, RET: open '%s' on %s port %s"
 +              (elpher-address-selector address)
 +              (elpher-address-host address)
 +              (elpher-address-port address)))))
 +
 +(defun elpher-insert-index-record (display-string type selector host port)
 +  "Function to insert an index record into the current buffer.
 +The contents of the record are dictated by TYPE, DISPLAY-STRING, SELECTOR, HOST
 +and PORT."
 +  (let ((address (elpher-make-address type selector host port))
 +        (type-map-entry (alist-get type elpher-type-map)))
      (if type-map-entry
-         (let* ((margin-code (cadr type-map-entry))
 -        (let ((getter (car type-map-entry))
 -              (margin-code (cadr type-map-entry))
 -              (face (elt type-map-entry 2)))
++        (let* ((margin-code (elt type-map-entry 1))
 +               (face (elt type-map-entry 2))
 +               (node (elpher-make-node display-string elpher-current-node address)))
            (elpher-insert-margin margin-code)
            (insert-text-button display-string
                                'face face
@@@ -798,11 -671,11 +803,13 @@@ host, selector and port.
      (message "No current site.")))
  
  (defun elpher-view-raw ()
--  "View current page as plain text."
++  "View raw server response for current page."
    (interactive)
    (if elpher-current-node
--      (elpher-visit-node elpher-current-node
--                         #'elpher-get-node-raw)
++      (if (elpher-address-special-p (elpher-node-address elpher-current-node))
++          (error "This page was not generated by a server.")
++        (elpher-visit-node elpher-current-node
++                           #'elpher-get-node-raw))
      (message "No current site.")))
  
  (defun elpher-back ()
@@@ -818,11 -691,11 +825,11 @@@
    (let ((button (button-at (point))))
      (if button
          (let ((node (button-get button 'elpher-node)))
--          (if node
--              (elpher-visit-node (button-get button 'elpher-node)
--                                 #'elpher-get-node-download)
-             (error "Can only download gopher links, not general URLs")))
 -            (message "Can only download gopher links, not general URLs.")))
 -      (message "No link selected."))))
++          (if (elpher-address-special-p (elpher-node-address node))
++              (error "Cannot download this link")
++            (elpher-visit-node (button-get button 'elpher-node)
++                               #'elpher-get-node-download)))
 +      (error "No link selected"))))
  
  (defun elpher-build-link-map ()
    "Build alist mapping link names to destination nodes in current buffer."