;;; Code:
-;; (defvar elopher-mode-map nil "Keymap for gopher client.")
-;; (define-key elopher-mode-map (kbd "p") 'elopher-quit)
+;;; Customization group
+;;
-;; (define-derived-mode elopher-mode special-mode "elopher"
-;; "Major mode for elopher, an elisp gopher client.")
+(defgroup elopher nil
+ "A simple gopher client."
+ :group 'applications)
-(defvar my-marker nil)
+(defcustom elopher-index-face '(foreground-color . "cyan")
+ "Face used for index records.")
+(defcustom elopher-text-face '(foreground-color . "white")
+ "Face used for text records.")
+(defcustom elopher-info-face '(foreground-color . "gray")
+ "Face used for info records.")
+(defcustom elopher-image-face '(foreground-color . "green")
+ "Face used for image records.")
+(defcustom elopher-unknown-face '(foreground-color . "red")
+ "Face used for unknown record types.")
+(defcustom elopher-margin-face '(foreground-color . "orange")
+ "Face used for record margin legend.")
-(defun my-filter (proc string)
- (with-current-buffer (get-buffer "*elopher*")
- (let ((marker (process-mark proc)))
- (if (not (marker-position marker))
- (set-marker marker 0 (current-buffer)))
+;;; Global variables
+;;
+
+(defvar elopher-version "1.0.0"
+ "Current version of elopher.")
+
+(defvar elopher-margin-width 6
+ "Width of left-hand margin used when rendering indicies.")
+
+(defvar elopher-history nil
+ "List of pages in elopher history.")
+
+(defvar elopher-start-page
+ (concat "i\tfake\tfake\t1\r\n"
+ "i--------------------------------------------\tfake\tfake\t1\r\n"
+ "i Elopher Gopher Client \tfake\tfake\t1\r\n"
+ (format "i version %s\tfake\tfake\t1\r\n" elopher-version)
+ "i--------------------------------------------\tfake\tfake\t1\r\n"
+ "i\tfake\tfake\t1\r\n"
+ "iBasic usage:\tfake\tfake\t1\r\n"
+ "i - tab/shift-tab: next/prev directory entry\tfake\tfake\t1\r\n"
+ "i - RET/mouse-1: open directory entry\tfake\tfake\t1\r\n"
+ "i - u: return to parent directory entry\tfake\tfake\t1\r\n"
+ "i - g: go to a particular site\tfake\tfake\t1\r\n"
+ "i\tfake\tfake\t1\r\n"
+ "iPlaces to start exploring Gopherspace:\tfake\tfake\t1\r\n"
+ "1Floodgap Systems Gopher Server\t\tgopher.floodgap.com\t70\r\n"
+ "1Super-Dimensional Fortress\t\tsdf.org\t70\r\n"
+ "i\tfake\tfake\t1\r\n"
+ "iTest entries:\tfake\tfake\t1\r\n"
+ "pXKCD comic image\t/fun/xkcd/comics/2130/2137/text_entry.png\tgopher.floodgap.com\t70\r\n"))
+
+
+;;; Mode and keymap
+;;
+
+(defvar elopher-mode-map
+ (let ((map (make-sparse-keymap)))
+ (define-key map (kbd "<tab>") 'elopher-next-link)
+ (define-key map (kbd "<S-tab>") 'elopher-prev-link)
+ (define-key map (kbd "u") 'elopher-history-back)
+ (define-key map (kbd "g") 'elopher-go)
+ (when (require 'evil nil t)
+ (evil-define-key 'normal map
+ (kbd "C-]") 'elopher-follow-closest-link
+ (kbd "C-t") 'elopher-history-back
+ (kbd "u") 'elopher-history-back
+ (kbd "g") 'elopher-go))
+ map)
+ "Keymap for gopher client.")
+
+(define-derived-mode elopher-mode special-mode "elopher"
+ "Major mode for elopher, an elisp gopher client.")
+
+;;; Index rendering
+;;
+
+(defun elopher-insert-margin (&optional type-name)
+ (if type-name
+ (insert (propertize
+ (format (concat "%" (number-to-string elopher-margin-width) "s")
+ (concat "[" type-name "] "))
+ 'face elopher-margin-face))
+ (insert (make-string elopher-margin-width ?\s))))
+
+(defun elopher-render-record (line)
+ (let* ((type (elt line 0))
+ (fields (split-string (substring line 1) "\t"))
+ (display-string (elt fields 0))
+ (selector (elt fields 1))
+ (hostname (elt fields 2))
+ (port (elt fields 3))
+ (address (list selector hostname port)))
+ (pcase type
+ (?i (elopher-insert-margin)
+ (insert (propertize display-string
+ 'face elopher-info-face)))
+ (?0 (elopher-insert-margin "T")
+ (insert-text-button display-string
+ 'face elopher-text-face
+ 'link-getter #'elopher-get-text
+ 'link-address address
+ 'action #'elopher-click-link
+ 'follow-link t))
+ (?1 (elopher-insert-margin "/")
+ (insert-text-button display-string
+ 'face elopher-index-face
+ 'link-getter #'elopher-get-index
+ 'link-address address
+ 'action #'elopher-click-link
+ 'follow-link t))
+ (?p (elopher-insert-margin "img")
+ (insert-text-button display-string
+ 'face elopher-image-face
+ 'link-getter #'elopher-get-image
+ 'link-address address
+ 'action #'elopher-click-link
+ 'follow-link t))
+ (?.) ; Occurs at end of index, can safely ignore.
+ (tp (elopher-insert-margin (concat (char-to-string tp) "?"))
+ (insert (propertize display-string
+ 'face elopher-unknown-face))))
+ (insert "\n")))
+
+(defvar elopher-incomplete-record "")
+
+(defun elopher-render-complete-records (string)
+ (let* ((til-now (string-join (list elopher-incomplete-record string)))
+ (lines (split-string til-now "\r\n")))
+ (dotimes (idx (length lines))
+ (if (< idx (- (length lines) 1))
+ (let ((line (elt lines idx)))
+ (unless (string-empty-p line)
+ (elopher-render-record line)))
+ (setq elopher-incomplete-record (elt lines idx))))))
+
+;;; Selector retrieval
+;;
+
+(defun elopher-get-selector (selector host port filter &optional sentinel)
+ (switch-to-buffer "*elopher*")
+ (push (buffer-string) elopher-history)
+ (elopher-mode)
+ (let ((inhibit-read-only t))
+ (erase-buffer))
+ (make-network-process
+ :name "elopher-process"
+ :host host
+ :service (if port port 70)
+ :filter filter
+ :sentinel sentinel)
+ (process-send-string "elopher-process" (concat selector "\n")))
+
+;; Index retrieval
+
+(defun elopher-index-filter (proc string)
+ (let ((marker (process-mark proc))
+ (inhibit-read-only t))
+ (if (not (marker-position marker))
+ (set-marker marker 0 (current-buffer)))
+ (save-excursion
+ (goto-char marker)
+ (elopher-render-complete-records string)
+ (set-marker marker (point)))))
+
+(defun elopher-get-index (selector host port)
+ (setq elopher-incomplete-record "")
+ (elopher-get-selector selector host port
+ #'elopher-index-filter))
+
+;; Text retrieval
+
+(defun elopher-text-filter (proc string)
+ (let ((marker (process-mark proc))
+ (inhibit-read-only t))
+ (if (not (marker-position marker))
+ (set-marker marker 0 (current-buffer)))
+ (save-excursion
+ (goto-char marker)
+ (dolist (line (split-string string "\r"))
+ (insert line))
+ (set-marker marker (point)))))
+
+(defun elopher-get-text (selector host port)
+ (elopher-get-selector selector host port
+ #'elopher-text-filter))
+
+;; Image retrieval
+
+(defvar elopher-image-buffer "")
+
+(defun elopher-image-filter (proc string)
+ (setq elopher-image-buffer (concat elopher-image-buffer string)))
+
+(defun elopher-image-sentinel (proc event)
+ (let ((inhibit-read-only t))
+ (insert-image (create-image elopher-image-buffer))))
+
+(defun elopher-get-image (selector host port)
+ (setq elopher-image-buffer "")
+ (elopher-get-selector selector host port
+ #'elopher-image-filter
+ #'elopher-image-sentinel))
+
+;;; Control methods for binding
+;;
+
+(defun elopher-history-back ()
+ (interactive)
+ (when elopher-history
+ (let ((inhibit-read-only t))
+ (erase-buffer)
(save-excursion
- (goto-char marker)
- (insert (propertize string 'face '(foreground-color . "yellow")))
- (set-marker marker (point))))))
-
+ (insert (pop elopher-history))))))
-(defun elopher ()
- "Start gopher client."
+(defun elopher-next-link ()
+ (interactive)
+ (forward-button 1))
+
+(defun elopher-prev-link ()
(interactive)
- (switch-to-buffer-other-window "*elopher*")
- (setq my-marker (make-marker))
- (erase-buffer)
- (make-process
- :name "date"
- :command (list "/bin/ls" "-l" "/")
- :filter #'my-filter))
-
-(elopher)
-
- ;; (address (read-from-minibuffer "Address of gopher server: ")))
- ;; (message "Connecting to '%s' ..." address)
- ;; (erase-buffer)
- ;; (insert (propertize "Hello, world." 'face '(foreground-color . "red")))
- ;; (newline)
- ;; (insert (propertize "Hello, Tim." 'face '(foreground-color . "yellow"))))
-
-(defun elopher-quit ()
+ (backward-button 1))
+
+(defun elopher-click-link (button)
+ (apply (button-get button 'link-getter) (button-get button 'link-address)))
+
+(defun elopher-follow-closest-link ()
(interactive)
- (kill-buffer "*elopher*"))
+ (push-button))
-(start-process "ls" "*elopher*" "/bin/date")
+(defun elopher-go ()
+ "Go to a particular gopher site."
+ (interactive)
+ (elopher-get-index "" (read-from-minibuffer "Gopher host: ") 70))
-;;; elopher.el ends here
+;;; Main start procedure
+;;
-(list-processes)
+(defun elopher ()
+ "Start elopher with default landing page."
+ (interactive)
+ (switch-to-buffer "*elopher*")
+ (elopher-mode)
+ (setq elopher-history nil)
+ (let ((inhibit-read-only t))
+ (erase-buffer)
+ (save-excursion
+ (elopher-render-complete-records elopher-start-page))))
+
+;; (elopher)
+;; (elopher-get-index "" "gopher.floodgap.com" 70)
+;; (elopher-get-image "/fun/xkcd/comics/2130/2137/text_entry.png" "gopher.floodgap.com" 70)
+
+;;; elopher.el ends here
The Lambda Lab / projects / elpher.git / blobdiff