;; Author: Tim Vaughan <tgvaughan@gmail.com>
;; Created: 11 April 2019
-;; Version: 1.1.1
+;; Version: 1.2.0
;; Keywords: comm gopher
;; Homepage: https://github.com/tgvaughan/elpher
;; Package-Requires: ((emacs "25"))
;; 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,
;;; Code:
(provide 'elpher)
+(require 'seq)
+(require 'pp)
;;; Global constants
;;
-(defconst elpher-version "1.1.1"
+(defconst elpher-version "1.2.0"
"Current version of elpher.")
(defconst elpher-margin-width 6
"i\tfake\tfake\t1"
"iUsage:\tfake\tfake\t1"
"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 - O: visit the root directory of the current server\tfake\tfake\t1"
- "i - g: go to a particular page\tfake\tfake\t1"
+ "i - tab/shift-tab: next/prev item on current page\tfake\tfake\t1"
+ "i - RET/mouse-1: open item under cursor\tfake\tfake\t1"
+ "i - m: select an item on current page by name (autocompletes)\tfake\tfake\t1"
+ "i - u: return to parent\tfake\tfake\t1"
+ "i - O: visit the root menu of the current server\tfake\tfake\t1"
+ "i - g: go to a particular menu or item\tfake\tfake\t1"
+ "i - i/I: info on item under cursor or current page\tfake\tfake\t1"
+ "i - c/C: copy URL representation of item under cursor or current page\tfake\tfake\t1"
+ "i - a/A: bookmark the item under cursor or current page\tfake\tfake\t1"
+ "i - x/X: remove bookmark for item under cursor or current page\tfake\tfake\t1"
+ "i - B: visit the bookmarks page\tfake\tfake\t1"
"i - r: redraw current page (using cached contents if available)\tfake\tfake\t1"
"i - R: reload current page (regenerates cache)\tfake\tfake\t1"
"i - d: download directory entry under cursor\tfake\tfake\t1"
"i - w: display the raw server response for the current page\tfake\tfake\t1"
"i\tfake\tfake\t1"
- "iPlaces to start exploring Gopherspace:\tfake\tfake\t1"
+ "iWhere 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"
(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)
+ (?7 elpher-get-search-node "?" elpher-search)
+ (?8 elpher-get-telnet-node "?" elpher-telnet)
(?9 elpher-get-node-download "B" elpher-binary)
- (?7 elpher-get-search-node "?" elpher-search))
+ (?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)
+ (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.")
;; Face customizations
(defface elpher-index
- '((t :inherit org-drawer))
+ '((t :inherit font-lock-keyword-face))
"Face used for directory type directory records.")
(defface elpher-text
- '((t :inherit org-tag))
+ '((t :inherit bold))
"Face used for text type directory records.")
(defface elpher-info
- '((t :inherit org-default))
+ '((t :inherit default))
"Face used for info type directory records.")
(defface elpher-image
- '((t :inherit org-level-4))
+ '((t :inherit font-lock-string-face))
"Face used for image type directory records.")
(defface elpher-search
- '((t :inherit org-level-5))
+ '((t :inherit warning))
"Face used for search type directory records.")
(defface elpher-url
- '((t :inherit org-level-6))
+ '((t :inherit font-lock-comment-face))
"Face used for url type directory records.")
+(defface elpher-telnet
+ '((t :inherit font-lock-function-name-face))
+ "Face used for telnet type directory records.")
+
(defface elpher-binary
- '((t :inherit org-level-7))
+ '((t :inherit font-lock-doc-face))
"Face used for binary type directory records.")
(defface elpher-unknown
- '((t :inherit org-warning))
+ '((t :inherit error))
"Face used for directory records with unknown/unsupported types.")
(defface elpher-margin-key
- '((t :inherit org-tag))
+ '((t :inherit bold))
"Face used for directory margin key.")
(defface elpher-margin-brackets
- '((t :inherit org-special-keyword))
+ '((t :inherit shadow))
"Face used for brackets around directory margin key.")
;; Other customizations
"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))
+(defcustom elpher-use-header t
+ "If non-nil, display current node information in buffer header."
+ :type '(boolean))
;;; Model
;;
;; Address
-(defun elpher-make-address (selector host port)
- "Create an address of a gopher object with SELECTOR, HOST and PORT."
- (list selector host 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)
+ "Retrieve type from ADDRESS."
+ (elt address 0))
(defun elpher-address-selector (address)
"Retrieve selector from ADDRESS."
- (elt address 0))
+ (elt address 1))
(defun elpher-address-host (address)
"Retrieve host from ADDRESS."
- (elt address 1))
+ (elt address 2))
(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."
- (elt node 0))
+ (elt node 1))
(defun elpher-node-address (node)
"Retrieve the address of NODE."
- (elt node 1))
-
-(defun elpher-node-getter (node)
- "Retrieve the preferred getter function 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-node-pos (node)
- "Retrieve the cached cursor position for NODE, or nil if none exists."
- (elt node 4))
+(defun elpher-get-cached-content (address)
+ "Retrieve the cached content for ADDRESS, or nil if none exists."
+ (gethash address 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-cache-content (address content)
+ "Set the content cache for ADDRESS to CONTENT."
+ (puthash address content elpher-content-cache))
-(defun elpher-set-node-pos (node pos)
- "Set the cursor position cache of NODE to POS."
- (setcar (nthcdr 4 node) pos))
+(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-cache-pos (address pos)
+ "Set the cursor position cache for ADDRESS to POS."
+ (puthash address pos elpher-pos-cache))
;; Node graph traversal
(setq elpher-current-node node)
(if getter
(funcall getter)
- (funcall (elpher-node-getter node))))
+ (let* ((address (elpher-node-address node))
+ (type (elpher-address-type address)))
+ (funcall (car (alist-get type elpher-type-map))))))
(defun elpher-visit-parent-node ()
"Visit the parent of the current 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)))))
+
;;; Buffer preparation
;;
+(defun elpher-update-header ()
+ "If `elpher-use-header' is true, display current node info in window header."
+ (if elpher-use-header
+ (setq header-line-format (elpher-node-display-string elpher-current-node))))
+
(defmacro elpher-with-clean-buffer (&rest args)
"Evaluate ARGS with a clean *elpher* buffer as current."
(list 'with-current-buffer "*elpher*"
'(elpher-mode)
(append (list 'let '((inhibit-read-only t))
- '(erase-buffer))
+ '(erase-buffer)
+ '(elpher-update-header))
args)))
+
;;; Index rendering
;;
+(defun elpher-preprocess-text-response (string)
+ "Clear away CRs and terminating period from STRING."
+ (replace-regexp-in-string "\n\.\n$" "\n"
+ (replace-regexp-in-string "\r" ""
+ string)))
+
(defun elpher-insert-index (string)
"Insert the index corresponding to STRING into the current buffer."
;; Should be able to split directly on CRLF, but some non-conformant
;; LF-only servers sadly exist, hence the following.
- (let* ((str-no-period (replace-regexp-in-string "\r\n\.\r\n$" "\r\n" string))
- (str-no-cr (replace-regexp-in-string "\r" "" str-no-period)))
- (dolist (line (split-string str-no-cr "\n"))
+ (let ((str-processed (elpher-preprocess-text-response string)))
+ (dolist (line (split-string str-processed "\n"))
(unless (= (length line) 0)
- (elpher-insert-index-record line)))))
+ (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 (if (elt fields 3)
+ (string-to-number (elt fields 3))
+ nil)))
+ (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."
(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
- 'elpher-node (elpher-make-node elpher-current-node
- address
- getter)
+ 'elpher-node node
'action #'elpher-click-link
'follow-link t
- 'help-echo (format "mouse-1, RET: open '%s' on %s port %s"
- selector host port)))
+ 'help-echo (elpher-node-button-help node)))
(pcase type
- (?i (elpher-insert-margin) ;; Information
- (insert (propertize
- (if elpher-buttonify-urls-in-directories
- (elpher-buttonify-urls display-string)
- display-string)
- 'face 'elpher-info)))
- (?h (elpher-insert-margin "W") ;; Web link
- (let ((url (elt (split-string selector "URL:") 1)))
- (insert-text-button display-string
- 'face 'elpher-url
- 'elpher-url url
- 'action #'elpher-click-url
- 'follow-link t
- 'help-echo (format "mouse-1, RET: open url %s" url))))
- (tp (elpher-insert-margin (concat (char-to-string tp) "?"))
- (insert (propertize display-string
- 'face 'elpher-unknown-face)))))
+ (?i ;; Information
+ (elpher-insert-margin)
+ (insert (propertize
+ (if elpher-buttonify-urls-in-directories
+ (elpher-buttonify-urls display-string)
+ display-string)
+ 'face 'elpher-info)))
+ (other ;; Unknown
+ (elpher-insert-margin (concat (char-to-string type) "?"))
+ (insert (propertize display-string
+ 'face 'elpher-unknown-face)))))
(insert "\n")))
+(defun elpher-click-link (button)
+ "Function called when the gopher link BUTTON is activated (via mouse or keypress)."
+ (let ((node (button-get button 'elpher-node)))
+ (elpher-visit-node node)))
+
;;; Selector retrieval (all kinds)
;;
(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
(defconst elpher-url-regex
- "\\(https?\\|gopher\\)://\\([a-zA-Z0-9.\-]+\\)\\(?3::[0-9]+\\)?\\(?4:/[^ \r\n\t(),]*\\)?"
+ "\\([a-zA-Z]+\\)://\\([a-zA-Z0-9.\-]+\\)\\(?3::[0-9]+\\)?\\(?4:/[^ \r\n\t(),]*\\)?"
"Regexp used to locate and buttinofy URLs in text files loaded by elpher.")
+(defun elpher-make-node-from-matched-url (parent &optional string)
+ "Convert most recent `elpher-url-regex' match to a node.
+
+PARENT defines the node to set as the parent to the new node.
+
+If STRING is non-nil, this is given as an argument to all `match-string'
+calls, as is necessary if the match is performed by `string-match'."
+ (let ((url (match-string 0 string))
+ (protocol (downcase (match-string 1 string))))
+ (if (string= protocol "gopher")
+ (let* ((host (match-string 2 string))
+ (port (if (> (length (match-string 3 string)) 1)
+ (string-to-number (substring (match-string 3 string) 1))
+ 70))
+ (type-and-selector (match-string 4 string))
+ (type (if (> (length type-and-selector) 1)
+ (elt type-and-selector 1)
+ ?1))
+ (selector (if (> (length type-and-selector) 1)
+ (substring type-and-selector 2)
+ ""))
+ (address (elpher-make-address type selector host port)))
+ (elpher-make-node url elpher-current-node address))
+ (let* ((host (match-string 2 string))
+ (port (if (> (length (match-string 3 string)) 1)
+ (string-to-number (substring (match-string 3 string) 1))
+ 70))
+ (selector (concat "URL:" url))
+ (address (elpher-make-address ?h selector host port)))
+ (elpher-make-node url elpher-current-node address)))))
+
+
(defun elpher-buttonify-urls (string)
"Turn substrings which look like urls in STRING into clickable buttons."
(with-temp-buffer
(insert string)
(goto-char (point-min))
(while (re-search-forward elpher-url-regex nil t)
- (let ((url (match-string 0))
- (protocol (downcase (match-string 1))))
- (if (string= protocol "gopher")
- (let* ((host (match-string 2))
- (port (if (match-string 3)
- (string-to-number (substring (match-string 3) 1))
- 70))
- (type-and-selector (match-string 4))
- (type (if (> (length type-and-selector) 1)
- (elt type-and-selector 1)
- ?1))
- (selector (if (> (length type-and-selector) 1)
- (substring type-and-selector 2)
- ""))
- (address (elpher-make-address selector host port))
- (getter (car (alist-get type elpher-type-map))))
- (make-text-button (match-beginning 0)
- (match-end 0)
- 'elpher-node (elpher-make-node elpher-current-node
- address
- getter)
- 'action #'elpher-click-link
- 'follow-link t
- 'help-echo (format "mouse-1, RET: open '%s' on %s port %s"
- selector host port)))
+ (let ((node (elpher-make-node-from-matched-url elpher-current-node)))
(make-text-button (match-beginning 0)
(match-end 0)
- 'elpher-url url
- 'action #'elpher-click-url
+ 'elpher-node node
+ 'action #'elpher-click-link
'follow-link t
- 'help-echo (format "mouse-1, RET: open url %s" url)))))
+ 'help-echo (elpher-node-button-help node))))
(buffer-string)))
-(defun elpher-process-text (string)
- "Remove CRs and trailing period from the gopher text document STRING."
- (let* ((chopped-str (replace-regexp-in-string "\r\n\.\r\n$" "\r\n" string))
- (cleaned-str (replace-regexp-in-string "\r" "" chopped-str)))
- (elpher-buttonify-urls cleaned-str)))
-
(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
(lambda (proc event)
(unless (string-prefix-p "deleted" event)
(elpher-with-clean-buffer
- (insert (elpher-process-text elpher-selector-string))
+ (insert (elpher-buttonify-urls
+ (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
(lambda (proc event)
(unless (string-prefix-p "deleted" event)
(let ((image (create-image
- (encode-coding-string elpher-selector-string
- 'no-conversion)
+ (encode-coding-string
+ elpher-selector-string
+ 'no-conversion)
nil t)))
(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
(unwind-protect
(let* ((query-string (read-string "Query: "))
(query-selector (concat (elpher-address-selector address) "\t" query-string))
- (search-address (elpher-make-address query-selector
- (elpher-address-host address)
- (elpher-address-port address))))
+ (search-address (elpher-make-address ?1
+ query-selector
+ (elpher-address-host address)
+ (elpher-address-port address))))
(setq aborted nil)
(elpher-with-clean-buffer
(insert "LOADING RESULTS..."))
(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
(message (format "Download complate, saved to file %s."
elpher-download-filename)))))))))
+;; URL retrieval
+
+(defun elpher-get-url-node ()
+ "Getter which attempts to open the URL specified by the current node."
+ (let* ((address (elpher-node-address elpher-current-node))
+ (selector (elpher-address-selector address)))
+ (elpher-visit-parent-node) ; Do first in case of non-local exits.
+ (let ((url (elt (split-string selector "URL:") 1)))
+ (if elpher-open-urls-with-eww
+ (browse-web url)
+ (browse-url url)))))
+
+;; Telnet node connection
-;;; Navigation procedures
+(defun elpher-get-telnet-node ()
+ "Getter which opens a telnet connection to the server specified by the current node."
+ (let* ((address (elpher-node-address elpher-current-node))
+ (host (elpher-address-host address))
+ (port (elpher-address-port address)))
+ (elpher-visit-parent-node)
+ (telnet host port)))
+
+;; Start page 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 page node retrieval
+
+(defun elpher-get-bookmarks-node ()
+ "Getter which loads and displays the current bookmark list."
+ (elpher-with-clean-buffer
+ (insert "---- Bookmark list ----\n\n")
+ (let ((bookmarks (elpher-load-bookmarks)))
+ (if bookmarks
+ (dolist (bookmark bookmarks)
+ (let ((display-string (elpher-bookmark-display-string bookmark))
+ (address (elpher-bookmark-address bookmark)))
+ (elpher-insert-index-record display-string
+ (elpher-address-type address)
+ (elpher-address-selector address)
+ (elpher-address-host address)
+ (elpher-address-port address))))
+ (insert "No bookmarks found.\n")))
+ (insert "\n-----------------------\n\n"
+ "u: return to previous page.\n"
+ "x: delete selected bookmark.\n"
+ "a: rename selected bookmark.\n")
+ (elpher-restore-pos)))
+
+
+;;; Bookmarks
+;;
+
+(defun elpher-make-bookmark (display-string address)
+ "Make an elpher bookmark.
+DISPLAY-STRING determines how the bookmark will appear in the
+bookmark list, while ADDRESS is the address of the entry."
+ (list display-string address))
+
+(defun elpher-bookmark-display-string (bookmark)
+ "Get the display string of BOOKMARK."
+ (elt bookmark 0))
+
+(defun elpher-set-bookmark-display-string (bookmark display-string)
+ "Set the display string of BOOKMARK to DISPLAY-STRING."
+ (setcar bookmark display-string))
+
+(defun elpher-bookmark-address (bookmark)
+ "Get the address for BOOKMARK."
+ (elt bookmark 1))
+
+(defun elpher-save-bookmarks (bookmarks)
+ "Record the bookmark list BOOKMARKS to the user's bookmark file.
+Beware that this completely replaces the existing contents of the file."
+ (with-temp-file (locate-user-emacs-file "elpher-bookmarks")
+ (erase-buffer)
+ (pp bookmarks (current-buffer))))
+
+(defun elpher-load-bookmarks ()
+ "Get the list of bookmarks from the users's bookmark file."
+ (with-temp-buffer
+ (ignore-errors
+ (insert-file-contents (locate-user-emacs-file "elpher-bookmarks"))
+ (goto-char (point-min))
+ (read (current-buffer)))))
+
+(defun elpher-add-address-bookmark (address display-string)
+ "Save a bookmark for ADDRESS with label DISPLAY-STRING.
+If ADDRESS is already bookmarked, update the label only."
+ (let ((bookmarks (elpher-load-bookmarks)))
+ (let ((existing-bookmark (rassoc (list address) bookmarks)))
+ (if existing-bookmark
+ (elpher-set-bookmark-display-string existing-bookmark display-string)
+ (add-to-list 'bookmarks (elpher-make-bookmark display-string address))))
+ (elpher-save-bookmarks bookmarks)))
+
+(defun elpher-remove-address-bookmark (address)
+ "Remove any bookmark to ADDRESS."
+ (elpher-save-bookmarks
+ (seq-filter (lambda (bookmark)
+ (not (equal (elpher-bookmark-address bookmark) address)))
+ (elpher-load-bookmarks))))
+
+;;; Interactive procedures
;;
(defun elpher-next-link ()
(interactive)
(backward-button 1))
-(defun elpher-click-link (button)
- "Function called when the gopher link BUTTON is activated (via mouse or keypress)."
- (let ((node (button-get button 'elpher-node)))
- (elpher-visit-node node)))
-
-(defun elpher-click-url (button)
- "Function called when the url link BUTTON is activated (via mouse or keypress)."
- (let ((url (button-get button 'elpher-url)))
- (if elpher-open-urls-with-eww
- (browse-web url)
- (browse-url url))))
-
(defun elpher-follow-current-link ()
"Open the link or url at point."
(interactive)
(push-button))
(defun elpher-go ()
- "Go to a particular gopher site."
+ "Go to a particular gopher site read from the minibuffer.
+ The site may be specified via a URL or explicitly in terms of
+ host, selector and port."
(interactive)
(let ((node
(let ((host-or-url (read-string "Gopher host or URL: ")))
(if (string-match elpher-url-regex host-or-url)
- (if (not (string= (downcase (match-string 1 host-or-url)) "gopher"))
- (error "Only gopher URLs acceptable")
- (let* ((host (match-string 2 host-or-url))
- (port (if (match-string 3 host-or-url)
- (string-to-number (substring (match-string 3 host-or-url) 1))
- 70))
- (type-and-selector (match-string 4 host-or-url))
- (type (if (> (length type-and-selector) 1)
- (elt type-and-selector 1)
- ?1))
- (selector (if (> (length type-and-selector) 1)
- (substring type-and-selector 2)
- ""))
- (address (elpher-make-address selector host port))
- (getter (car (alist-get type elpher-type-map))))
- (elpher-make-node elpher-current-node
- address
- getter)))
- (let* ((selector (read-string "Selector (default none): " nil nil ""))
- (port (read-string "Port (default 70): " nil nil 70))
- (address (list selector host-or-url port)))
- (elpher-make-node elpher-current-node
- address
- #'elpher-get-index-node))))))
+ (elpher-make-node-from-matched-url elpher-current-node
+ host-or-url)
+ (let ((selector (read-string "Selector (default none): " nil nil ""))
+ (port-string (read-string "Port (default 70): " nil nil "70")))
+ (elpher-make-node (concat "gopher://" host-or-url
+ ":" port-string
+ "/1" selector)
+ elpher-current-node
+ (elpher-make-address ?1 selector host-or-url
+ (string-to-number port-string))))))))
(switch-to-buffer "*elpher*")
(elpher-visit-node node)))
(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 ()
(interactive)
(if (elpher-node-parent elpher-current-node)
(elpher-visit-parent-node)
- (message "No previous site.")))
+ (error "No previous site")))
(defun elpher-download ()
"Download the link at point."
(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."
(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)))
(if link-map
(let ((key (let ((completion-ignore-case t))
- (completing-read "Directory entry/link (tab to autocomplete): "
+ (completing-read "Directory item/link: "
link-map nil t))))
(if (and key (> (length key) 0))
(let ((b (cdr (assoc key 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)))
(if (> (length selector) 0)
- (let ((root-address (elpher-make-address "" host port)))
- (elpher-visit-node (elpher-make-node elpher-current-node
- root-address
- #'elpher-get-index-node)))
- (message "Already at root directory of current server.")))
- (message "Command invalid for Elpher start page."))))
+ (let ((root-address (elpher-make-address ?1 "" host port)))
+ (elpher-visit-node
+ (elpher-make-node (concat "gopher://" host
+ ":" (number-to-string port)
+ "/1/")
+ elpher-current-node
+ root-address)))
+ (error "Already at root directory of current server")))
+ (error "Command invalid for this page"))))
+
+(defun elpher-bookmarks-current-p ()
+ "Return non-nil if current node is a bookmarks page."
+ (eq (elpher-address-type (elpher-node-address elpher-current-node)) 'bookmarks))
+
+(defun elpher-reload-bookmarks ()
+ "Reload bookmarks if current node is a bookmarks page."
+ (if (elpher-bookmarks-current-p)
+ (elpher-reload-current-node)))
+
+(defun elpher-bookmark-current ()
+ "Bookmark the current node."
+ (interactive)
+ (unless (elpher-bookmarks-current-p)
+ (let ((address (elpher-node-address elpher-current-node))
+ (display-string (read-string "Bookmark display string: "
+ (elpher-node-display-string elpher-current-node))))
+ (elpher-add-address-bookmark address display-string)
+ (message "Bookmark added."))))
+
+(defun elpher-bookmark-link ()
+ "Bookmark the link at point."
+ (interactive)
+ (let ((button (button-at (point))))
+ (if button
+ (let* ((node (button-get button 'elpher-node))
+ (address (elpher-node-address node))
+ (display-string (read-string "Bookmark display string: "
+ (elpher-node-display-string node))))
+ (elpher-add-address-bookmark address display-string)
+ (elpher-reload-bookmarks)
+ (message "Bookmark added."))
+ (error "No link selected"))))
+
+(defun elpher-unbookmark-current ()
+ "Remove bookmark for the current node."
+ (interactive)
+ (unless (elpher-bookmarks-current-p)
+ (elpher-remove-address-bookmark (elpher-node-address elpher-current-node))
+ (message "Bookmark removed.")))
+
+(defun elpher-unbookmark-link ()
+ "Remove bookmark for the link at point."
+ (interactive)
+ (let ((button (button-at (point))))
+ (if button
+ (let ((node (button-get button 'elpher-node)))
+ (elpher-remove-address-bookmark (elpher-node-address node))
+ (elpher-reload-bookmarks)
+ (message "Bookmark removed."))
+ (error "No link selected"))))
+
+(defun elpher-bookmarks ()
+ "Visit bookmarks."
+ (interactive)
+ (elpher-visit-node
+ (elpher-make-node "Bookmarks"
+ elpher-current-node
+ (elpher-make-address 'bookmarks))))
+
+(defun elpher-info-node (node)
+ "Display information on NODE."
+ (let ((display-string (elpher-node-display-string node))
+ (address (elpher-node-address node)))
+ (if address
+ (message "`%s' on %s port %s"
+ (elpher-address-selector address)
+ (elpher-address-host address)
+ (elpher-address-port address))
+ (message "%s" display-string))))
+
+(defun elpher-info-link ()
+ "Display information on node corresponding to link at point."
+ (interactive)
+ (let ((button (button-at (point))))
+ (if button
+ (elpher-info-node (button-get button 'elpher-node))
+ (error "No item selected"))))
+
+(defun elpher-info-current ()
+ "Display information on current node."
+ (interactive)
+ (elpher-info-node elpher-current-node))
+
+(defun elpher-get-address-url (address)
+ "Get URL representation of ADDRESS."
+ (concat "gopher://"
+ (elpher-address-host address)
+ (let ((port (elpher-address-port address)))
+ (if (equal port 70)
+ ""
+ (format ":%d" port)))
+ "/" (string (elpher-address-type address))
+ (elpher-address-selector address)))
+
+(defun elpher-copy-node-url (node)
+ "Copy URL representation of address of NODE to `kill-ring'."
+ (let ((address (elpher-node-address node)))
+ (if address
+ (let ((url (elpher-get-address-url address)))
+ (message url)
+ (kill-new url))
+ (error (format "Cannot represent %s as URL" (elpher-node-display-string node))))))
+
+(defun elpher-copy-link-url ()
+ "Copy URL of item at point to `kill-ring'."
+ (interactive)
+ (let ((button (button-at (point))))
+ (if button
+ (elpher-copy-node-url (button-get button 'elpher-node))
+ (error "No item selected"))))
+
+(defun elpher-copy-current-url ()
+ "Copy URL of current node to `kill-ring'."
+ (interactive)
+ (elpher-copy-node-url elpher-current-node))
;;; 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)
+ (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)
+ (define-key map (kbd "C") 'elpher-copy-current-url)
+ (define-key map (kbd "a") 'elpher-bookmark-link)
+ (define-key map (kbd "A") 'elpher-bookmark-current)
+ (define-key map (kbd "x") 'elpher-unbookmark-link)
+ (define-key map (kbd "X") 'elpher-unbookmark-current)
+ (define-key map (kbd "B") 'elpher-bookmarks)
(when (fboundp 'evil-define-key)
- (evil-define-key 'normal map
+ (evil-define-key 'motion map
(kbd "TAB") 'elpher-next-link
(kbd "C-]") 'elpher-follow-current-link
(kbd "C-t") 'elpher-back
(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
+ (kbd "C") 'elpher-copy-current-url
+ (kbd "a") 'elpher-bookmark-link
+ (kbd "A") 'elpher-bookmark-current
+ (kbd "x") 'elpher-unbookmark-link
+ (kbd "X") 'elpher-unbookmark-current
+ (kbd "B") 'elpher-bookmarks))
map)
"Keymap for gopher client.")
(define-derived-mode elpher-mode special-mode "elpher"
"Major mode for elpher, an elisp gopher client.")
+(when (fboundp 'evil-set-initial-state)
+ (evil-set-initial-state 'elpher-mode 'motion))
;;; Main start procedure
;;
(switch-to-buffer "*elpher*")
(switch-to-buffer "*elpher*")
(setq elpher-current-node nil)
- (let ((start-node (elpher-make-node nil
- elpher-start-address
- #'elpher-get-index-node)))
+ (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 / commitdiff