;; Elpher aims to provide a full-featured gopher client for GNU Emacs.
;; It supports:
-;; - intuitive keyboard and mouse-driven browsing,
+;; - intuitive keyboard and mouse-driven interface,
;; - caching of visited sites (both content and cursor position),
;; - pleasant and configurable colouring of Gopher directories,
;; - direct visualisation of image files,
"i\tfake\tfake\t1"
"iPlaces to start exploring Gopherspace:\tfake\tfake\t1"
"i\tfake\tfake\t1"
- "1Floodgap Systems Gopher Server\t\tgopher.floodgap.com\t70"
+ "1Floodgap Systems Gopher Server\t/\tgopher.floodgap.com\t70"
"i\tfake\tfake\t1"
"iAlternatively, select the following item and enter some\tfake\tfake\t1"
"isearch terms:\tfake\tfake\t1"
(?g elpher-get-image-node "im" elpher-image)
(?p elpher-get-image-node "im" elpher-image)
(?I elpher-get-image-node "im" elpher-image)
- (?h elpher-get-url-node "W" elpher-url))
+ (?h elpher-get-url-node "W" elpher-url)
+ (bookmarks elpher-get-bookmarks-node "#" elpher-index)
+ (start elpher-get-start-node "#" elpher-index))
"Association list from types to getters, margin codes and index faces.")
;; Address
-(defun elpher-make-address (type selector host port)
- "Create an address of a gopher object with TYPE, SELECTOR, HOST and PORT."
+(defun elpher-make-address (type &optional selector host port)
+ "Create an address of a gopher object with TYPE, SELECTOR, HOST and PORT.
+Although selector host and port are optional, they are only omitted for
+special address types, such as 'start for the start page."
(list type selector host port))
(defun elpher-address-type (address)
;; Node
-(defun elpher-make-node (display-string parent address &optional content pos)
+(defun elpher-make-node (display-string parent address)
"Create a node in the gopher page hierarchy.
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.
-
-The optional arguments CONTENT and POS can be used to fill the cached
-content and cursor position fields of the node."
- (list display-string parent address content pos))
+address of the gopher page."
+ (list display-string parent address))
(defun elpher-node-display-string (node)
"Retrieve the display string of NODE."
"Retrieve the address of NODE."
(elt node 2))
-(defun elpher-node-content (node)
- "Retrieve the cached content of NODE, or nil if none exists."
- (elt node 3))
+;; Cache
+
+(defvar elpher-content-cache (make-hash-table :test 'equal))
+(defvar elpher-pos-cache (make-hash-table :test 'equal))
+
+(defun elpher-get-cached-content (address)
+ "Retrieve the cached content for ADDRESS, or nil if none exists."
+ (gethash address elpher-content-cache))
-(defun elpher-node-pos (node)
- "Retrieve the cached cursor position for NODE, or nil if none exists."
- (elt node 4))
+(defun elpher-cache-content (address content)
+ "Set the content cache for ADDRESS to CONTENT."
+ (puthash address content elpher-content-cache))
-(defun elpher-set-node-content (node content)
- "Set the content cache of NODE to CONTENT."
- (setcar (nthcdr 3 node) content))
+(defun elpher-get-cached-pos (address)
+ "Retrieve the cached cursor position for ADDRESS, or nil if none exists."
+ (gethash address elpher-pos-cache))
-(defun elpher-set-node-pos (node pos)
- "Set the cursor position cache of NODE to POS."
- (setcar (nthcdr 4 node) pos))
+(defun elpher-cache-pos (address pos)
+ "Set the cursor position cache for ADDRESS to POS."
+ (puthash address pos elpher-pos-cache))
;; Node graph traversal
(elpher-save-pos)
(elpher-process-cleanup)
(setq elpher-current-node node)
- (with-current-buffer "*elpher*"
- (setq header-line-format "hello"))
- ;; (let ((inhibit-read-only t))
-
- ;; (force-mode-line-update))
(if getter
(funcall getter)
(let* ((address (elpher-node-address node))
- (type (if address
- (elpher-address-type address)
- ?1)))
+ (type (elpher-address-type address)))
(funcall (car (alist-get type elpher-type-map))))))
(defun elpher-visit-parent-node ()
(defun elpher-reload-current-node ()
"Reload the current node, discarding any existing cached content."
- (elpher-set-node-content elpher-current-node nil)
+ (elpher-cache-content (elpher-node-address elpher-current-node) nil)
(elpher-visit-node elpher-current-node))
(defun elpher-save-pos ()
"Save the current position of point to the current node."
(when elpher-current-node
- (elpher-set-node-pos elpher-current-node (point))))
+ (elpher-cache-pos (elpher-node-address elpher-current-node) (point))))
(defun elpher-restore-pos ()
"Restore the position of point to that cached in the current node."
- (let ((pos (elpher-node-pos elpher-current-node)))
+ (let ((pos (elpher-get-cached-pos (elpher-node-address elpher-current-node))))
(if pos
(goto-char pos)
(goto-char (point-min)))))
"Insert the index corresponding to STRING into the current buffer."
;; Should be able to split directly on CRLF, but some non-conformant
;; LF-only servers sadly exist, hence the following.
- (let ((str-processed (elpher-preprocess-text-response string))
- formatting-error)
+ (let ((str-processed (elpher-preprocess-text-response string)))
(dolist (line (split-string str-processed "\n"))
(unless (= (length line) 0)
(let* ((type (elt line 0))
(port (if (elt fields 3)
(string-to-number (elt fields 3))
nil)))
- (if (< (length fields) 4)
- (setq formatting-error t))
- (elpher-insert-index-record display-string type selector host port))))
- (if formatting-error
- (display-warning :warning "One or more badly formatted index records detected."))))
+ (elpher-insert-index-record display-string type selector host port))))))
(defun elpher-insert-margin (&optional type-name)
"Insert index margin, optionally containing the TYPE-NAME, into the current buffer."
(type-map-entry (alist-get type elpher-type-map)))
(if type-map-entry
(let* ((margin-code (cadr type-map-entry))
- (face (caddr type-map-entry))
+ (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
(defun elpher-get-index-node ()
"Getter which retrieves the current node contents as an index."
- (let ((content (elpher-node-content elpher-current-node))
- (address (elpher-node-address elpher-current-node)))
+ (let* ((address (elpher-node-address elpher-current-node))
+ (content (elpher-get-cached-content address)))
(if content
(progn
(elpher-with-clean-buffer
(insert content)
(elpher-restore-pos)))
- (if address
- (progn
- (elpher-with-clean-buffer
- (insert "LOADING DIRECTORY..."))
- (elpher-get-selector address
- (lambda (proc event)
- (unless (string-prefix-p "deleted" event)
- (elpher-with-clean-buffer
- (elpher-insert-index elpher-selector-string)
- (elpher-restore-pos)
- (elpher-set-node-content elpher-current-node
- (buffer-string)))))))
- (progn
- (elpher-with-clean-buffer
- (elpher-insert-index elpher-start-index)
- (elpher-restore-pos)
- (elpher-set-node-content elpher-current-node
- (buffer-string))))))))
+ (elpher-with-clean-buffer
+ (insert "LOADING DIRECTORY..."))
+ (elpher-get-selector address
+ (lambda (proc event)
+ (unless (string-prefix-p "deleted" event)
+ (elpher-with-clean-buffer
+ (elpher-insert-index elpher-selector-string)
+ (elpher-restore-pos)
+ (elpher-cache-content
+ (elpher-node-address elpher-current-node)
+ (buffer-string)))))))))
;; Text retrieval
(defun elpher-get-text-node ()
"Getter which retrieves the current node contents as a text document."
- (let ((content (elpher-node-content elpher-current-node))
- (address (elpher-node-address elpher-current-node)))
+ (let* ((address (elpher-node-address elpher-current-node))
+ (content (elpher-get-cached-content address)))
(if content
(progn
(elpher-with-clean-buffer
(elpher-preprocess-text-response
elpher-selector-string)))
(elpher-restore-pos)
- (elpher-set-node-content elpher-current-node
- (buffer-string))))))))))
+ (elpher-cache-content
+ (elpher-node-address elpher-current-node)
+ (buffer-string))))))))))
;; Image retrieval
(defun elpher-get-image-node ()
"Getter which retrieves the current node contents as an image to view."
- (let ((content (elpher-node-content elpher-current-node))
- (address (elpher-node-address elpher-current-node)))
+ (let* ((address (elpher-node-address elpher-current-node))
+ (content (elpher-get-cached-content address)))
(if content
(progn
(elpher-with-clean-buffer
(insert-image image)
(elpher-restore-pos))
(if elpher-cache-images
- (elpher-set-node-content elpher-current-node
- image)))))))
+ (elpher-cache-content
+ (elpher-node-address elpher-current-node)
+ image)))))))
(elpher-get-node-download)))))
;; Search retrieval
(defun elpher-get-search-node ()
"Getter which submits a search query to the address of the current node."
- (let ((content (elpher-node-content elpher-current-node))
- (address (elpher-node-address elpher-current-node))
- (aborted t))
+ (let* ((address (elpher-node-address elpher-current-node))
+ (content (elpher-get-cached-content address))
+ (aborted t))
(if content
(progn
(elpher-with-clean-buffer
(elpher-with-clean-buffer
(elpher-insert-index elpher-selector-string))
(goto-char (point-min))
- (elpher-set-node-content elpher-current-node
- (buffer-string))))))
+ (elpher-cache-content
+ (elpher-node-address elpher-current-node)
+ (buffer-string))))))
(if aborted
(elpher-visit-parent-node))))))
(defun elpher-get-node-raw ()
"Getter which retrieves the raw server response for the current node."
- (let* ((content (elpher-node-content elpher-current-node))
- (address (elpher-node-address elpher-current-node)))
+ (let ((address (elpher-node-address elpher-current-node)))
(elpher-with-clean-buffer
(insert "LOADING RAW SERVER RESPONSE..."))
(if address
(elpher-visit-parent-node)
(telnet host port)))
+;; Start node retrieval
+
+(defun elpher-get-start-node ()
+ "Getter which displays the start page."
+ (elpher-with-clean-buffer
+ (elpher-insert-index elpher-start-index)
+ (elpher-restore-pos)))
+
;;; Bookmarks
;;
(elpher-make-node-from-matched-url elpher-current-node
host-or-url)
(let ((selector (read-string "Selector (default none): " nil nil ""))
- (port (string-to-number (read-string "Port (default 70): "
- nil nil 70))))
+ (port-string (read-string "Port (default 70): " nil nil "70")))
(elpher-make-node (concat "gopher://" host-or-url
- ":" port
+ ":" port-string
"/1" selector)
elpher-current-node
- (elpher-make-address ?1 selector host-or-url port)))))))
+ (elpher-make-address ?1 selector host-or-url
+ (string-to-number port-string))))))))
(switch-to-buffer "*elpher*")
(elpher-visit-node node)))
(setq b (next-button (button-start b))))
link-map))
-(defun elpher-menu ()
+(defun elpher-jump ()
"Select a directory entry by name. Similar to the info browser (m)enu command."
(interactive)
(let* ((link-map (elpher-build-link-map)))
(defun elpher-root-dir ()
"Visit root of current server."
(interactive)
- (let ((address (elpher-node-address elpher-current-node)))
- (if address
+ (let* ((address (elpher-node-address elpher-current-node))
+ (host (elpher-address-host address)))
+ (if host
(let ((host (elpher-address-host address))
(selector (elpher-address-selector address))
(port (elpher-address-port address)))
elpher-current-node
root-address)))
(error "Already at root directory of current server")))
- (error "Command invalid for Elpher start page"))))
+ (error "Command invalid for this page"))))
(defun elpher-info-node (node)
"Display information on NODE."
(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)
+ (define-key map (kbd "m") 'elpher-jump)
(define-key map (kbd "i") 'elpher-info-link)
(define-key map (kbd "I") 'elpher-info-current)
(define-key map (kbd "c") 'elpher-copy-link-url)
(kbd "R") 'elpher-reload
(kbd "w") 'elpher-view-raw
(kbd "d") 'elpher-download
- (kbd "m") 'elpher-menu
+ (kbd "m") 'elpher-jump
(kbd "i") 'elpher-info-link
(kbd "I") 'elpher-info-current
(kbd "c") 'elpher-copy-link-url
(switch-to-buffer "*elpher*")
(switch-to-buffer "*elpher*")
(setq elpher-current-node nil)
- (let ((start-node (elpher-make-node "Elpher Start Page"
- nil elpher-start-address)))
+ (let ((start-node (elpher-make-node "Elpher Start Page" nil (elpher-make-address 'start))))
(elpher-visit-node start-node)))
"Started Elpher.") ; Otherwise (elpher) evaluates to start page string.
The Lambda Lab / projects / elpher.git / blobdiff