[Emacs-diffs] Changes to emacs/lisp/url/url-methods.el [emacs-unicode-2]

[Miles Bader]

Index: emacs/lisp/url/url-methods.el
diff -c /dev/null emacs/lisp/url/url-methods.el:1.5.2.1
*** /dev/null   Thu Oct 14 08:51:02 2004
--- emacs/lisp/url/url-methods.el       Thu Oct 14 08:49:52 2004
***************
*** 0 ****
--- 1,150 ----
+ ;;; url-methods.el --- Load URL schemes as needed
+ 
+ ;; Copyright (c) 1996,1997,1998,1999,2004  Free Software Foundation, Inc.
+ 
+ ;; Keywords: comm, data, processes, hypermedia
+ 
+ ;; This file is part of GNU Emacs.
+ 
+ ;; GNU Emacs is free software; you can redistribute it and/or modify
+ ;; it under the terms of the GNU General Public License as published by
+ ;; the Free Software Foundation; either version 2, or (at your option)
+ ;; any later version.
+ ;;
+ ;; GNU Emacs is distributed in the hope that it will be useful,
+ ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
+ ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ ;; GNU General Public License for more details.
+ ;;
+ ;; You should have received a copy of the GNU General Public License
+ ;; along with GNU Emacs; see the file COPYING.  If not, write to the
+ ;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ ;; Boston, MA 02111-1307, USA.
+ 
+ ;;; Commentary:
+ 
+ ;;; Code:
+ 
+ (eval-when-compile
+   (require 'cl))
+ 
+ ;; This loads up some of the small, silly URLs that I really don't
+ ;; want to bother putting in their own separate files.
+ (require 'url-parse)
+ 
+ (defvar url-scheme-registry (make-hash-table :size 7 :test 'equal))
+ 
+ (defconst url-scheme-methods
+   '((default-port      . variable)
+     (asynchronous-p    . variable)
+     (expand-file-name  . function)
+     (file-exists-p     . function)
+     (file-attributes   . function)
+     (parse-url         . function)
+     (file-symlink-p    . function)
+     (file-writable-p   . function)
+     (file-directory-p  . function)
+     (file-executable-p . function)
+     (directory-files   . function)
+     (file-truename     . function))
+   "Assoc-list of methods that each URL loader can provide.")
+ 
+ (defconst url-scheme-default-properties
+   (list 'name "unknown"
+       'loader 'url-scheme-default-loader
+       'default-port 0
+       'expand-file-name 'url-identity-expander
+       'parse-url 'url-generic-parse-url
+       'asynchronous-p nil
+       'file-directory-p 'ignore
+       'file-truename (lambda (&rest args)
+                        (url-recreate-url (car args)))
+       'file-exists-p 'ignore
+       'file-attributes 'ignore))
+ 
+ (defun url-scheme-default-loader (url &optional callback cbargs)
+   "Signal an error for an unknown URL scheme."
+   (error "Unkown URL scheme: %s" (url-type url)))
+ 
+ (defun url-scheme-register-proxy (scheme)
+   "Automatically find a proxy for SCHEME and put it in `url-proxy-services'."
+   (let* ((env-var (concat scheme "_proxy"))
+        (env-proxy (or (getenv (upcase env-var))
+                       (getenv (downcase env-var))))
+        (cur-proxy (assoc scheme url-proxy-services))
+        (urlobj nil))
+ 
+     ;; Store any proxying information - this will not overwrite an old
+     ;; entry, so that people can still set this information in their
+     ;; .emacs file
+     (cond
+      (cur-proxy nil)                  ; Keep their old settings
+      ((null env-proxy) nil)           ; No proxy setup
+      ;; First check if its something like hostname:port
+      ((string-match "^\\([^:]+\\):\\([0-9]+\\)$" env-proxy)
+       (setq urlobj (url-generic-parse-url nil)) ; Get a blank object
+       (url-set-type urlobj "http")
+       (url-set-host urlobj (match-string 1 env-proxy))
+       (url-set-port urlobj (string-to-number (match-string 2 env-proxy))))
+      ;; Then check if its a fully specified URL
+      ((string-match url-nonrelative-link env-proxy)
+       (setq urlobj (url-generic-parse-url env-proxy))
+       (url-set-type urlobj "http")
+       (url-set-target urlobj nil))
+      ;; Finally, fall back on the assumption that its just a hostname
+      (t
+       (setq urlobj (url-generic-parse-url nil)) ; Get a blank object
+       (url-set-type urlobj "http")
+       (url-set-host urlobj env-proxy)))
+ 
+      (if (and (not cur-proxy) urlobj)
+        (progn
+          (setq url-proxy-services
+                (cons (cons scheme (format "%s:%d" (url-host urlobj)
+                                           (url-port urlobj)))
+                      url-proxy-services))
+          (message "Using a proxy for %s..." scheme)))))
+ 
+ (defun url-scheme-get-property (scheme property)
+   "Get property of a URL SCHEME.
+ Will automatically try to load a backend from url-SCHEME.el if
+ it has not already been loaded."
+   (setq scheme (downcase scheme))
+   (let ((desc (gethash scheme url-scheme-registry)))
+     (if (not desc)
+       (let* ((stub (concat "url-" scheme))
+              (loader (intern stub)))
+         (condition-case ()
+             (require loader)
+           (error nil))
+         (if (fboundp loader)
+             (progn
+               ;; Found the module to handle <scheme> URLs
+               (url-scheme-register-proxy scheme)
+               (setq desc (list 'name scheme
+                                'loader loader))
+               (dolist (cell url-scheme-methods)
+                 (let ((symbol (intern-soft (format "%s-%s" stub (car cell))))
+                       (type (cdr cell)))
+                   (if symbol
+                       (case type
+                         (function
+                          ;; Store the symbol name of a function
+                          (if (fboundp symbol)
+                              (setq desc (plist-put desc (car cell) symbol))))
+                         (variable
+                          ;; Store the VALUE of a variable
+                          (if (boundp symbol)
+                              (setq desc (plist-put desc (car cell)
+                                                    (symbol-value symbol)))))
+                         (otherwise
+                          (error "Malformed url-scheme-methods entry: %S"
+                                 cell))))))
+               (puthash scheme desc url-scheme-registry)))))
+     (or (plist-get desc property)
+       (plist-get url-scheme-default-properties property))))
+ 
+ (provide 'url-methods)
+ 
+ ;; arch-tag: 336863f8-5a07-4906-9be5-b3c6bcebbe67
+ ;;; url-methods.el ends here