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
   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, or (at your option)
  13 ;; 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; see the file COPYING.  If not, write to the
  22 ;; Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
  23 ;; Boston, MA 02110-1301, USA.
  24
  25 ;;; Commentary:
  26
  27 ;;; Code:
  28
  29 (require 'url-util)
  30 (require 'url-parse)
  31
  32 (defun url-probe-protocols ()
  33   "Return a list of all potential URL schemes."
  34   (or (get 'url-extension-protocols 'probed)
  35       (mapc (lambda (s) (url-scheme-get-property s 'name))
  36             (or (get 'url-extension-protocols 'schemes)
  37                 (let ((schemes '("info" "man" "rlogin" "telnet"
  38                                  "tn3270" "data" "snews")))
  39                   (mapc (lambda (d)
  40                           (mapc (lambda (f)
  41                                   (if (string-match "url-\\(.*\\).el$" f)
  42                                       (push (match-string 1 f) schemes)))
  43                                 (directory-files d nil "^url-.*\\.el$")))
  44                         load-path)
  45                   (put 'url-extension-protocols 'schemes schemes)
  46                   schemes)))))
  47
  48 (defvar url-scheme-registry)
  49
  50 (defun url-about-protocols (url)
  51   (url-probe-protocols)
  52   (insert "<html>\n"
  53           " <head>\n"
  54           "  <title>Supported Protocols</title>\n"
  55           " </head>\n"
  56           " <body>\n"
  57           "  <h1>Supported Protocols - URL v" url-version "</h1>\n"
  58           "  <table width='100%' border='1'>\n"
  59           "   <tr>\n"
  60           "    <td>Protocol\n"
  61           "    <td>Properties\n"
  62           "    <td>Description\n"
  63           "   </tr>\n")
  64   (mapc (lambda (k)
  65           (if (string= k "proxy")
  66               ;; Ignore the proxy setting... its magic!
  67               nil
  68             (insert "   <tr>\n")
  69             ;; The name of the protocol
  70             (insert "    <td valign=top>" (or (url-scheme-get-property k 'name) k) "\n")
  71
  72             ;; Now the properties.  Currently just asynchronous
  73             ;; status, default port number, and proxy status.
  74             (insert "    <td valign=top>"
  75                     (if (url-scheme-get-property k 'asynchronous-p) "As" "S")
  76                     "ynchronous<br>\n"
  77                     (if (url-scheme-get-property k 'default-port)
  78                         (format "Default Port: %d<br>\n"
  79                                 (url-scheme-get-property k 'default-port)) "")
  80                     (if (assoc k url-proxy-services)
  81                         (format "Proxy: %s<br>\n" (assoc k url-proxy-services)) ""))
  82             ;; Now the description...
  83             (insert "    <td valign=top>"
  84                     (or (url-scheme-get-property k 'description) "N/A"))))
  85         (sort (let (x) (maphash (lambda (k v) (push k x)) url-scheme-registry) x) 'string-lessp))
  86   (insert "  </table>\n"
  87           " </body>\n"
  88           "</html>\n"))
  89
  90 (defun url-about (url)
  91   "Show internal URLs."
  92   (let* ((item (downcase (url-filename url)))
  93          (func (intern (format "url-about-%s" item))))
  94     (if (fboundp func)
  95         (progn
  96           (set-buffer (generate-new-buffer " *about-data*"))
  97           (insert "Content-type: text/plain\n\n")
  98           (funcall func url)
  99           (current-buffer))
 100       (error "URL does not know about `%s'" item))))
 101
 102 (provide 'url-about)
 103
 104 ;; arch-tag: 65dd7fca-db3f-4cb1-8026-7dd37d4a460e
 105 ;;; url-about.el ends here