lisp/url/url-about.el

   1 ;;; url-about.el --- Show internal URLs
   2
   3 ;; Copyright (C) 2001, 2004, 2005, 2006, 2007 Free Software Foundation, Inc.
   4
   5 ;; Keywords: comm, data, processes, hypermedia
   6
   7 ;; This file is part of GNU Emacs.
   8 ;;
   9 ;; GNU Emacs is free software; you can redistribute it and/or modify
  10 ;; it under the terms of the GNU General Public License as published by
  11 ;; the Free Software Foundation; either version 3, or (at your option)
  12 ;; any later version.
  13 ;;
  14 ;; GNU Emacs is distributed in the hope that it will be useful,
  15 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
  16 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17 ;; GNU General Public License for more details.
  18 ;;
  19 ;; You should have received a copy of the GNU General Public License
  20 ;; along with GNU Emacs; see the file COPYING.  If not, write to the
  21 ;; Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
  22 ;; Boston, MA 02110-1301, USA.
  23
  24 ;;; Commentary:
  25
  26 ;;; Code:
  27
  28 (eval-when-compile
  29   (require 'cl))
  30 (require 'url-util)
  31 (require 'url-parse)
  32
  33 (defun url-probe-protocols ()
  34   "Return a list of all potential URL schemes."
  35   (or (get 'url-extension-protocols 'probed)
  36       (mapc (lambda (s) (url-scheme-get-property s 'name))
  37             (or (get 'url-extension-protocols 'schemes)
  38                 (let ((schemes '("info" "man" "rlogin" "telnet"
  39                                  "tn3270" "data" "snews")))
  40                   (mapc (lambda (d)
  41                           (mapc (lambda (f)
  42                                   (if (string-match "url-\\(.*\\).el$" f)
  43                                       (push (match-string 1 f) schemes)))
  44                                 (directory-files d nil "^url-.*\\.el$")))
  45                         load-path)
  46                   (put 'url-extension-protocols 'schemes schemes)
  47                   schemes)))))
  48
  49 (defvar url-scheme-registry)
  50
  51 (defun url-about-protocols (url)
  52   (url-probe-protocols)
  53   (insert "<html>\n"
  54           " <head>\n"
  55           "  <title>Supported Protocols</title>\n"
  56           " </head>\n"
  57           " <body>\n"
  58           "  <h1>Supported Protocols - URL v" url-version "</h1>\n"
  59           "  <table width='100%' border='1'>\n"
  60           "   <tr>\n"
  61           "    <td>Protocol\n"
  62           "    <td>Properties\n"
  63           "    <td>Description\n"
  64           "   </tr>\n")
  65   (mapc (lambda (k)
  66           (if (string= k "proxy")
  67               ;; Ignore the proxy setting... its magic!
  68               nil
  69             (insert "   <tr>\n")
  70             ;; The name of the protocol
  71             (insert "    <td valign=top>" (or (url-scheme-get-property k 'name) k) "\n")
  72
  73             ;; Now the properties.  Currently just asynchronous
  74             ;; status, default port number, and proxy status.
  75             (insert "    <td valign=top>"
  76                     (if (url-scheme-get-property k 'asynchronous-p) "As" "S")
  77                     "ynchronous<br>\n"
  78                     (if (url-scheme-get-property k 'default-port)
  79                         (format "Default Port: %d<br>\n"
  80                                 (url-scheme-get-property k 'default-port)) "")
  81                     (if (assoc k url-proxy-services)
  82                         (format "Proxy: %s<br>\n" (assoc k url-proxy-services)) ""))
  83             ;; Now the description...
  84             (insert "    <td valign=top>"
  85                     (or (url-scheme-get-property k 'description) "N/A"))))
  86         (sort (let (x) (maphash (lambda (k v) (push k x)) url-scheme-registry) x) 'string-lessp))
  87   (insert "  </table>\n"
  88           " </body>\n"
  89           "</html>\n"))
  90
  91 (defun url-about (url)
  92   "Show internal URLs."
  93   (let* ((item (downcase (url-filename url)))
  94          (func (intern (format "url-about-%s" item))))
  95     (if (fboundp func)
  96         (progn
  97           (set-buffer (generate-new-buffer " *about-data*"))
  98           (insert "Content-type: text/plain\n\n")
  99           (funcall func url)
 100           (current-buffer))
 101       (error "URL does not know about `%s'" item))))
 102
 103 (provide 'url-about)
 104
 105 ;; arch-tag: 65dd7fca-db3f-4cb1-8026-7dd37d4a460e
 106 ;;; url-about.el ends here