emms-url: New file containing the url.el interaction routines from emms-lastfm.el. I plan to use these in other parts of EMMS as well.

darcs-hash:20070105034035-1bfb2-d213da8dab318baf3fc5d6a1f7a3ac75d0e7640c.gz

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+;;; emms-url.el --- Make URL and EMMS work together well
+
+;; Copyright (C) 2006, 2007 Free Software Foundation, Inc.
+
+;; This file is part of EMMS.
+
+;; EMMS 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.
+;;
+;; EMMS 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 EMMS; see the file COPYING.  If not, write to the
+;; Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
+;; Boston, MA 02110-1301, USA.
+
+;;; Commentary:
+
+;; These routines sanify input to URL and parse data returned by URL.
+
+;;; Code:
+
+(require 'url)
+
+(defvar emms-url-specials
+  '((?\" . """)
+    (?\< . "&lt;")
+    (?\> . "&gt;")
+    (?\& . "&amp;")
+    (?\  . "%20")
+    (?\n . "%0D%0A"))
+  "*An alist of characters which must be represented specially in URLs.
+The transformation is the key of the pair.")
+
+(defun emms-escape-url (url)
+  "Escape specials in URL.
+
+The specials to escape are specified by the `emms-url-specials'
+variable."
+  (apply (function concat)
+         (mapcar
+          (lambda (ch)
+            (let ((repl (assoc ch emms-url-specials)))
+              (if (null repl)
+                  (char-to-string ch)
+                (cdr repl))))
+          (append url nil))))
+
+(defun emms-http-content-coding ()
+  (and (boundp 'url-http-content-type)
+       (string-match ";\\s-*charset=\\([^;[:space:]]+\\)"
+                     url-http-content-type)
+       (intern-soft (downcase (match-string 1 url-http-content-type)))))
+
+(defun emms-http-decode-buffer ()
+  "Recode the buffer with `url-retrieve's contents. Else the
+buffer would contain multibyte chars like \\123\\456."
+  (let* ((default (or (car default-process-coding-system) 'utf-8))
+         (coding  (or (emms-http-content-coding) default)))
+    ;; (pop-to-buffer (current-buffer))
+    ;; (message "content-type: %s" url-http-content-type)
+    ;; (message "coding: %S [default: %S]" coding default)
+    (set-buffer-multibyte t)
+    (decode-coding-region (point-min) (point-max) coding)))
+
+(provide 'emms-url)
+;;; emms-url.el ends here