;;; Commentary:
-;; Elpher is a tool for exploring "gopherspace" using GNU Emacs.
+;; Elpher aims to provide a full-featured gopher client for GNU Emacs.
+;; It supports:
+
+;; - intuitive keyboard and mouse-driven browsing,
+;; - caching of visited sites (both content and cursor position),
+;; - pleasant and configurable colouring of Gopher directories,
+;; - direct visualisation of image files,
+;; - (m)enu key support, similar to Emacs' info browser,
+;; - clickable web and gopher links in plain text.
+
+;; The caching mechanism works by maintaining a hierarchy of visited
+;; pages rather than a linear history, meaning that it is quick and
+;; easy to navigate this history.
+
+;; To launch Elpher, simply use 'M-x elpher'. This will open a start
+;; page containing information on key bindings and suggested starting
+;; points for your gopher exploration.
+
+;; Faces, caching options and start page can be configured via
+;; the Elpher customization group in Applications.
;;; Code:
"i\tfake\tfake\t1"
"i - tab/shift-tab: next/prev directory entry on current page\tfake\tfake\t1"
"i - RET/mouse-1: open directory entry under cursor\tfake\tfake\t1"
+ "i - m: select a directory entry by name (autocompletes)\tfake\tfake\t1"
"i - u: return to parent directory entry\tfake\tfake\t1"
"i - g: go to a particular page\tfake\tfake\t1"
"i - r: redraw current page (using cached contents if available)\tfake\tfake\t1"
"\r\n")
"Source for elpher start page.")
+(defconst elpher-type-map
+ '((?0 elpher-get-text-node "T" elpher-text)
+ (?1 elpher-get-index-node "/" elpher-index)
+ (?g elpher-get-image-node "im" elpher-image)
+ (?p elpher-get-image-node "im" elpher-image)
+ (?I elpher-get-image-node "im" elpher-image)
+ (?4 elpher-get-node-download "B" elpher-binary)
+ (?5 elpher-get-node-download "B" elpher-binary)
+ (?9 elpher-get-node-download "B" elpher-binary)
+ (?7 elpher-get-search-node "?" elpher-search))
+ "Association list from types to getters, margin codes and index faces.")
+
;;; Customization group
;;
"A gopher client."
:group 'applications)
+;; Face customizations
+
(defface elpher-index
'((((background dark)) :foreground "deep sky blue")
(((background light)) :foreground "blue"))
'((t :foreground "blue"))
"Face used for brackets around margin key.")
+;; Other customizations
+
(defcustom elpher-open-urls-with-eww nil
"If non-nil, open URL selectors using eww.
Otherwise, use the system browser via the BROWSE-URL function."
"If non-nil, cache images in memory in the same way as other content."
:type '(boolean))
+(defcustom elpher-start-address nil
+ "If nil, the default start directory is shown when Elpher is started.
+Otherwise, a list containing the selector, host and port of a directory to
+use as the start page."
+ :type '(list string string integer))
+
+
;;; Model
;;
(insert " "))
(insert (make-string elpher-margin-width ?\s))))
-(defvar elpher-type-map
- '((?0 elpher-get-text-node "T" elpher-text)
- (?1 elpher-get-index-node "/" elpher-index)
- (?g elpher-get-image-node "im" elpher-image)
- (?p elpher-get-image-node "im" elpher-image)
- (?I elpher-get-image-node "im" elpher-image)
- (?4 elpher-get-node-download "B" elpher-binary)
- (?5 elpher-get-node-download "B" elpher-binary)
- (?9 elpher-get-node-download "B" elpher-binary)
- (?7 elpher-get-search-node "?" elpher-search))
- "Association list from types to getters, margin codes and index faces.")
-
(defun elpher-insert-index-record (line)
"Insert the index record corresponding to LINE into the current buffer."
(let* ((type (elt line 0))
(if button
(let ((node (button-get button 'elpher-node)))
(if node
- (elpher-visit-node (button-get button 'elpher-node
- #'elpher-get-node-download))
+ (elpher-visit-node (button-get button 'elpher-node)
+ #'elpher-get-node-download)
(message "Can only download gopher links, not general URLs.")))
(message "No link selected."))))
+(defun elpher-build-link-map ()
+ "Build alist mapping link names to destination nodes in current buffer."
+ (let ((link-map nil)
+ (b (next-button (point-min) t)))
+ (while b
+ (add-to-list 'link-map (cons (button-label b) b))
+ (setq b (next-button (button-start b))))
+ link-map))
+
+(defun elpher-menu ()
+ "Select a directory entry by name. Similar to the info browser (m)enu command."
+ (interactive)
+ (let* ((link-map (elpher-build-link-map)))
+ (if link-map
+ (let* ((key (let ((completion-ignore-case t))
+ (completing-read "Menu item: " link-map nil t)))
+ (b (cdr (assoc key link-map))))
+ (goto-char (button-start b))
+ (button-activate b)))))
+
;;; Mode and keymap
;;
(define-key map (kbd "R") 'elpher-reload)
(define-key map (kbd "w") 'elpher-view-raw)
(define-key map (kbd "d") 'elpher-download)
+ (define-key map (kbd "m") 'elpher-menu)
(when (fboundp 'evil-define-key)
(evil-define-key 'normal map
(kbd "TAB") 'elpher-next-link
(kbd "r") 'elpher-redraw
(kbd "R") 'elpher-reload
(kbd "w") 'elpher-view-raw
- (kbd "d") 'elpher-download))
+ (kbd "d") 'elpher-download
+ (kbd "m") 'elpher-menu))
map)
"Keymap for gopher client.")
"Start elpher with default landing page."
(interactive)
(setq elpher-current-node nil)
- (let ((start-node (elpher-make-node nil nil #'elpher-get-index-node)))
+ (let ((start-node (elpher-make-node nil
+ elpher-start-address
+ #'elpher-get-index-node)))
(elpher-visit-node start-node))
"Started Elpher.") ; Otherwise (elpher) evaluates to start page string.