1 ;;; elopher.el --- gopher client
5 ;; Simple gopher client in elisp.
10 (let ((map (make-sparse-keymap)))
11 (define-key map (kbd "<tab>") 'elopher-next-link)
12 (define-key map (kbd "<S-tab>") 'elopher-prev-link)
13 (define-key map (kbd "u") 'elopher-history-back)
14 (define-key map (kbd "g") 'elopher-go)
15 (when (require 'evil nil t)
16 (evil-define-key 'normal map
17 (kbd "C-]") 'elopher-follow-closest-link
18 (kbd "C-t") 'elopher-history-back
19 (kbd "u") 'elopher-history-back
20 (kbd "g") 'elopher-go))
22 ;; "Keymap for gopher client.")
24 (define-derived-mode elopher-mode special-mode "elopher"
25 "Major mode for elopher, an elisp gopher client.")
27 (defvar elopher-margin-width 5)
29 (defun elopher-insert-margin (&optional type-name)
32 (format (concat "%" (number-to-string elopher-margin-width) "s")
33 (concat "[" type-name "] "))
34 'face '(foreground-color . "orange")))
35 (insert (make-string elopher-margin-width ?\s))))
37 (defun elopher-render-record (line)
38 (let* ((type (elt line 0))
39 (fields (split-string (substring line 1) "\t"))
40 (display-string (elt fields 0))
41 (selector (elt fields 1))
42 (hostname (elt fields 2))
44 (address (list selector hostname port)))
46 (?i (elopher-insert-margin)
47 (insert (propertize display-string
48 'face '(foreground-color . "gray"))))
49 (?0 (elopher-insert-margin "T")
50 (insert-text-button display-string
51 'face '(foreground-color . "white")
52 'link-getter #'elopher-get-text
54 'action #'elopher-click-link
56 (?1 (elopher-insert-margin "/")
57 (insert-text-button display-string
58 'face '(foreground-color . "cyan")
59 'link-getter #'elopher-get-index
61 'action #'elopher-click-link
63 (?p (elopher-insert-margin "img")
64 (insert-text-button display-string
65 'face '(foreground-color . "cyan")
66 'link-getter #'elopher-get-image
68 'action #'elopher-click-link
70 (?.) ; Occurs at end of index, can safely ignore.
71 (tp (elopher-insert-margin (concat (char-to-string tp) "?"))
72 (insert (propertize display-string
73 'face '(foreground-color . "red")))))
76 (defvar elopher-incomplete-record "")
78 (defun elopher-render-complete-records (string)
79 (let* ((til-now (string-join (list elopher-incomplete-record string)))
80 (lines (split-string til-now "\r\n")))
81 (dotimes (idx (length lines))
82 (if (< idx (- (length lines) 1))
83 (let ((line (elt lines idx)))
84 (unless (string-empty-p line)
85 (elopher-render-record line)))
86 (setq elopher-incomplete-record (elt lines idx))))))
88 (defun elopher-get-selector (selector host port filter &optional sentinel)
89 (switch-to-buffer "*elopher*")
91 (let ((inhibit-read-only t))
94 :name "elopher-process"
96 :service (if port port 70)
99 (process-send-string "elopher-process" (concat selector "\n")))
101 (defun elopher-index-filter (proc string)
102 (with-current-buffer (get-buffer "*elopher*")
103 (let ((marker (process-mark proc))
104 (inhibit-read-only t))
105 (if (not (marker-position marker))
106 (set-marker marker 0 (current-buffer)))
109 (elopher-render-complete-records string)
110 (set-marker marker (point))))))
112 (defun elopher-get-index (selector host port)
113 (setq elopher-incomplete-record "")
114 (elopher-get-selector selector host port #'elopher-index-filter))
116 (defun elopher-text-filter (proc string)
117 (with-current-buffer (get-buffer "*elopher*")
118 (let ((marker (process-mark proc))
119 (inhibit-read-only t))
120 (if (not (marker-position marker))
121 (set-marker marker 0 (current-buffer)))
124 (dolist (line (split-string string "\r"))
126 (set-marker marker (point))))))
128 (defun elopher-get-text (selector host port)
129 (elopher-get-selector selector host port #'elopher-text-filter))
131 (defvar elopher-image-buffer "")
133 (defun elopher-image-filter (proc string)
134 (setq elopher-image-buffer (concat elopher-image-buffer string)))
136 (defun elopher-image-sentinel (proc event)
137 (let ((inhibit-read-only t))
138 (insert-image (create-image elopher-image-buffer))))
140 (defun elopher-get-image (selector host port)
141 (setq elopher-image-buffer "")
142 (elopher-get-selector selector host port #'elopher-image-filter #'elopher-image-sentinel))
144 (defun elopher-history-back ()
146 (let ((inhibit-read-only t))
149 (defun elopher-next-link ()
153 (defun elopher-prev-link ()
157 (defun elopher-click-link (button)
158 (apply (button-get button 'link-getter) (button-get button 'link-address)))
160 (defun elopher-follow-closest-link ()
165 "Go to a particular gopher site."
167 (elopher-get-index "" (read-from-minibuffer "Gopher host: ") 70))
170 "Start elopher with default landing page."
172 (switch-to-buffer "*elopher*")
174 (let ((inhibit-read-only t))
177 (elopher-render-complete-records
178 (concat "i\tfake\tfake\t1\r\n"
179 "i--------------------------------------------\tfake\tfake\t1\r\n"
180 "i Elopher Gopher Client \tfake\tfake\t1\r\n"
181 "i version 1.0 \tfake\tfake\t1\r\n"
182 "i--------------------------------------------\tfake\tfake\t1\r\n"
183 "i\tfake\tfake\t1\r\n"
184 "iBasic usage:\tfake\tfake\t1\r\n"
185 "i - tab/shift-tab: next/prev directory entry\tfake\tfake\t1\r\n"
186 "i - RET/mouse-1: open directory entry\tfake\tfake\t1\r\n"
187 "i - u: return to parent directory entry\tfake\tfake\t1\r\n"
188 "i - g: go to a particular site\tfake\tfake\t1\r\n"
189 "i\tfake\tfake\t1\r\n"
190 "iPlaces to start exploring Gopherspace:\tfake\tfake\t1\r\n"
191 "1Floodgap Systems Gopher Server\t\tgopher.floodgap.com\t70\r\n"
192 "1Super-Dimensional Fortress\t\tgopher.floodgap.com\t70\r\n"
193 "i\tfake\tfake\t1\r\n"
194 "iTest entries:\tfake\tfake\t1\r\n"
195 "pXKCD comic image\t/fun/xkcd/comics/2130/2137/text_entry.png\tgopher.floodgap.com\t70\r\n")))))
198 ;; (elopher-get-index "" "gopher.floodgap.com" 70)
199 ;; (elopher-get-image "/fun/xkcd/comics/2130/2137/text_entry.png" "gopher.floodgap.com" 70)
201 ;;; elopher.el ends here