-;;; elpher.el --- Full-featured gopher client.
+;;; elpher.el --- a friendly gopher client.
;; Copyright (C) 2019 Tim Vaughan
;; Author: Tim Vaughan <tgvaughan@gmail.com>
;; Created: 11 April 2019
-;; Version: 1.1.0
+;; Version: 1.2.0
;; Keywords: comm gopher
;; Homepage: https://github.com/tgvaughan/elpher
;; Package-Requires: ((emacs "25"))
;;; Commentary:
-;; Elpher aims to provide a full-featured gopher client for GNU Emacs.
+;; Elpher aims to provide a practical gopher client for GNU Emacs.
;; It supports:
;; - intuitive keyboard and mouse-driven interface,
;; - 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.
+;; - clickable web and gopher links in plain text,
+;; - a simple bookmark management system.
;; Visited pages are stored as a hierarchy rather than a linear history,
;; meaning that navigation between these pages is quick and easy.
;;; Global constants
;;
-(defconst elpher-version "1.1.0"
+(defconst elpher-version "1.2.0"
"Current version of elpher.")
(defconst elpher-margin-width 6
"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"
"i\tfake\tfake\t1"
"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))
"Retrieve port from ADDRESS."
(elt address 3))
+(defun elpher-address-special-p (address)
+ (not (elpher-address-host address)))
+
;; Node
(defun elpher-make-node (display-string parent address)
(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* ((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)
(other ;; Unknown
(elpher-insert-margin (concat (char-to-string type) "?"))
(insert (propertize display-string
- 'face 'elpher-unknown-face)))))
+ 'face 'elpher-unknown)))))
(insert "\n")))
(defun elpher-click-link (button)
"Retrieve selector specified by ADDRESS, then execute AFTER.
The result is stored as a string in the variable ‘elpher-selector-string’."
(setq elpher-selector-string "")
- (make-network-process
- :name "elpher-process"
- :host (elpher-address-host address)
- :service (elpher-address-port address)
- :filter (lambda (proc string)
- (setq elpher-selector-string (concat elpher-selector-string string)))
- :sentinel after)
- (process-send-string "elpher-process"
- (concat (elpher-address-selector address) "\n")))
+ (condition-case nil
+ (progn
+ (make-network-process :name "elpher-process"
+ :host (elpher-address-host address)
+ :service (elpher-address-port address)
+ :filter (lambda (proc string)
+ (setq elpher-selector-string
+ (concat elpher-selector-string string)))
+ :sentinel after)
+ (process-send-string "elpher-process"
+ (concat (elpher-address-selector address) "\n")))
+ (error
+ (elpher-with-clean-buffer
+ (insert (propertize "\n---- ERROR -----\n\n" 'face 'error)
+ "Failed to connect to " (elpher-get-address-url address) ".\n"
+ (propertize "\n----------------\n\n" 'face 'error)
+ "Press 'u' to return to the previous page.")))))
;; Index retrieval
(insert content)
(elpher-restore-pos)))
(elpher-with-clean-buffer
- (insert "LOADING DIRECTORY..."))
+ (insert "LOADING DIRECTORY... (use 'u' to cancel)"))
(elpher-get-selector address
(lambda (proc event)
(unless (string-prefix-p "deleted" event)
(elpher-restore-pos)))
(progn
(elpher-with-clean-buffer
- (insert "LOADING TEXT..."))
+ (insert "LOADING TEXT... (use 'u' to cancel)"))
(elpher-get-selector address
(lambda (proc event)
(unless (string-prefix-p "deleted" event)
(if (display-images-p)
(progn
(elpher-with-clean-buffer
- (insert "LOADING IMAGE..."))
+ (insert "LOADING IMAGE... (use 'u' to cancel)"))
(elpher-get-selector address
(lambda (proc event)
(unless (string-prefix-p "deleted" event)
(elpher-address-port address))))
(setq aborted nil)
(elpher-with-clean-buffer
- (insert "LOADING RESULTS..."))
+ (insert "LOADING RESULTS... (use 'u' to cancel)"))
(elpher-get-selector search-address
(lambda (proc event)
(unless (string-prefix-p "deleted" event)
"Getter which retrieves the raw server response for the current node."
(let ((address (elpher-node-address elpher-current-node)))
(elpher-with-clean-buffer
- (insert "LOADING RAW SERVER RESPONSE..."))
+ (insert "LOADING RAW SERVER RESPONSE... (use 'u' to cancel)"))
(if address
(elpher-get-selector address
(lambda (proc event)
(elpher-visit-parent-node)
(telnet host port)))
-;; Start node retrieval
+;; 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\n"
+ "Bookmarks are stored in the file "
+ (locate-user-emacs-file "elpher-bookmarks"))
+ (elpher-restore-pos)))
;;; Bookmarks
"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))
Beware that this completely replaces the existing contents of the file."
(with-temp-file (locate-user-emacs-file "elpher-bookmarks")
(erase-buffer)
+ (insert "; Elpher gopher bookmarks file\n\n"
+ "; Bookmarks are stored as a list of (label (type selector host port))\n"
+ "; s-expressions, where type is stored as a character (i.e. 49 = ?1).\n"
+ "; Feel free to edit by hand, but ensure this structure remains intact.\n\n")
(pp bookmarks (current-buffer))))
(defun elpher-load-bookmarks ()
(goto-char (point-min))
(read (current-buffer)))))
-(defun elpher-add-node-bookmark (node)
- "Add bookmark to NODE to the saved list of bookmarks."
- (let ((bookmark (elpher-make-bookmark (elpher-node-display-string node)
- (elpher-node-address node)))
- (bookmarks (elpher-load-bookmarks)))
- (add-to-list 'bookmarks bookmark)
+(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-node-bookmark (node)
- "Remove bookmark to NODE from the saved list of bookmarks."
- (let ((bookmark (elpher-make-bookmark (elpher-node-display-string node)
- (elpher-node-address node))))
+(defun elpher-remove-address-bookmark (address)
+ "Remove any bookmark to ADDRESS."
(elpher-save-bookmarks
- (seq-filter (lambda (this-bookmark)
- (not (equal bookmark this-bookmark)))
- (elpher-load-bookmarks)))))
-
-(defun elpher-display-bookmarks ()
- "Display saved bookmark list."
- (interactive)
- (elpher-with-clean-buffer
- (insert "Use 'r' to return to the previous page.\n\n"
- "---- 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-----------------------")
- (goto-char (point-min))
- (elpher-next-link)))
-
-(defun elpher-bookmark-current ()
- "Bookmark the current node."
- (interactive)
- (elpher-add-node-bookmark elpher-current-node))
+ (seq-filter (lambda (bookmark)
+ (not (equal (elpher-bookmark-address bookmark) address)))
+ (elpher-load-bookmarks))))
-(defun elpher-bookmark-link ()
- "Bookmark the link at point."
- (interactive)
- (let ((button (button-at (point))))
- (if button
- (elpher-add-node-bookmark (button-get button 'elpher-node))
- (error "No link selected"))))
-
-(defun elpher-unbookmark-current ()
- "Remove bookmark for the current node."
- (interactive)
- (elpher-remove-node-bookmark elpher-current-node))
-
-(defun elpher-unbookmark-link ()
- "Remove bookmark for the link at point."
- (interactive)
- (let ((button (button-at (point))))
- (if button
- (elpher-remove-node-bookmark (button-get button 'elpher-node))
- (error "No link selected"))))
-
-;;; Interactive navigation procedures
+;;; Interactive procedures
;;
(defun elpher-next-link ()
(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: ")))
(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 ()
(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")))
+ (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 ()
(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))))
(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)
+ (switch-to-buffer "*elpher*")
+ (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))
(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 'motion map
(kbd "TAB") 'elpher-next-link
(kbd "A") 'elpher-bookmark-current
(kbd "x") 'elpher-unbookmark-link
(kbd "X") 'elpher-unbookmark-current
- (kbd "B") 'elpher-display-bookmarks))
+ (kbd "B") 'elpher-bookmarks))
map)
"Keymap for gopher client.")
The Lambda Lab / projects / elpher.git / blobdiff