code.delx.au - gnu-emacs/blob - lisp/url/url-about.el

   1 ;;; url-about.el --- Show internal URLs
   2
   3 ;; Copyright (C) 2001, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011
   4 ;;   Free Software Foundation, Inc.
   5
   6 ;; Keywords: comm, data, processes, hypermedia
   7
   8 ;; This file is part of GNU Emacs.
   9 ;;
  10 ;; GNU Emacs is free software: you can redistribute it and/or modify
  11 ;; it under the terms of the GNU General Public License as published by
  12 ;; the Free Software Foundation, either version 3 of the License, or
  13 ;; (at your option) any later version.
  14
  15 ;; GNU Emacs is distributed in the hope that it will be useful,
  16 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
  17 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18 ;; GNU General Public License for more details.
  19
  20 ;; You should have received a copy of the GNU General Public License
  21 ;; along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.
  22
  23 ;;; Commentary:
  24
  25 ;;; Code:
  26
  27 (require 'url-util)
  28 (require 'url-parse)
  29
  30 (defun url-probe-protocols ()
  31   "Return a list of all potential URL schemes."
  32   (or (get 'url-extension-protocols 'probed)
  33       (mapc (lambda (s) (url-scheme-get-property s 'name))
  34             (or (get 'url-extension-protocols 'schemes)
  35                 (let ((schemes '("info" "man" "rlogin" "telnet"
  36                                  "tn3270" "data" "snews")))
  37                   (mapc (lambda (d)
  38                           (mapc (lambda (f)
  39                                   (if (string-match "url-\\(.*\\).el$" f)
  40                                       (push (match-string 1 f) schemes)))
  41                                 (directory-files d nil "^url-.*\\.el$")))
  42                         load-path)
  43                   (put 'url-extension-protocols 'schemes schemes)
  44                   schemes)))))
  45
  46 (defvar url-scheme-registry)
  47
  48 (defun url-about-protocols (url)
  49   (url-probe-protocols)
  50   (insert "<html>\n"
  51           " <head>\n"
  52           "  <title>Supported Protocols</title>\n"
  53           " </head>\n"
  54           " <body>\n"
  55           "  <h1>Supported Protocols - URL v" url-version "</h1>\n"
  56           "  <table width='100%' border='1'>\n"
  57           "   <tr>\n"
  58           "    <td>Protocol\n"
  59           "    <td>Properties\n"
  60           "    <td>Description\n"
  61           "   </tr>\n")
  62   (mapc (lambda (k)
  63           (if (string= k "proxy")
  64               ;; Ignore the proxy setting... its magic!
  65               nil
  66             (insert "   <tr>\n")
  67             ;; The name of the protocol
  68             (insert "    <td valign=top>" (or (url-scheme-get-property k 'name) k) "\n")
  69
  70             ;; Now the properties.  Currently just asynchronous
  71             ;; status, default port number, and proxy status.
  72             (insert "    <td valign=top>"
  73                     (if (url-scheme-get-property k 'asynchronous-p) "As" "S")
  74                     "ynchronous<br>\n"
  75                     (if (url-scheme-get-property k 'default-port)
  76                         (format "Default Port: %d<br>\n"
  77                                 (url-scheme-get-property k 'default-port)) "")
  78                     (if (assoc k url-proxy-services)
  79                         (format "Proxy: %s<br>\n" (assoc k url-proxy-services)) ""))
  80             ;; Now the description...
  81             (insert "    <td valign=top>"
  82                     (or (url-scheme-get-property k 'description) "N/A"))))
  83         (sort (let (x) (maphash (lambda (k v) (push k x)) url-scheme-registry) x) 'string-lessp))
  84   (insert "  </table>\n"
  85           " </body>\n"
  86           "</html>\n"))
  87
  88 (defun url-about (url)
  89   "Show internal URLs."
  90   (let* ((item (downcase (url-filename url)))
  91          (func (intern (format "url-about-%s" item))))
  92     (if (fboundp func)
  93         (progn
  94           (set-buffer (generate-new-buffer " *about-data*"))
  95           (insert "Content-type: text/plain\n\n")
  96           (funcall func url)
  97           (current-buffer))
  98       (error "URL does not know about `%s'" item))))
  99
 100 (provide 'url-about)
 101
 102 ;;; url-about.el ends here