lisp/muse-protocols.el

   1 ;;; muse-protocols.el --- URL protocols that Muse recognizes
   2
   3 ;; Copyright (C) 2005, 2006 Free Software Foundation, Inc.
   4
   5 ;; Author: Brad Collins (brad AT chenla DOT org)
   6
   7 ;; This file is part of Emacs Muse.  It is not part of GNU Emacs.
   8
   9 ;; Emacs Muse is free software; you can redistribute it and/or modify
  10 ;; it under the terms of the GNU General Public License as published
  11 ;; by the Free Software Foundation; either version 2, or (at your
  12 ;; option) any later version.
  13
  14 ;; Emacs Muse is distributed in the hope that it will be useful, but
  15 ;; WITHOUT ANY WARRANTY; without even the implied warranty of
  16 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  17 ;; General Public License for more details.
  18
  19 ;; You should have received a copy of the GNU General Public License
  20 ;; along with Emacs Muse; 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 ;; Here's an example for adding a protocol for the site yubnub, a Web
  27 ;; Command line service.
  28 ;;
  29 ;; (add-to-list 'muse-url-protocols '("yubnub://" muse-browse-url-yubnub
  30 ;;                                                muse-resolve-url-yubnub))
  31 ;;
  32 ;; (defun muse-resolve-url-yubnub (url)
  33 ;;   "Resolve a yubnub URL."
  34 ;;   ;; Remove the yubnub://
  35 ;;   (when (string-match "\\`yubnub://\\(.+\\)" url)
  36 ;;     (match-string 1)))
  37 ;;
  38 ;; (defun muse-browse-url-yubnub (url)
  39 ;;   "If this is a yubnub URL-command, jump to it."
  40 ;;   (setq url (muse-resolve-url-yubnub url))
  41 ;;   (browse-url (concat "http://yubnub.org/parser/parse?command="
  42 ;;                       url)))
  43
  44 ;;; Contributors:
  45
  46 ;; Phillip Lord (Phillip.Lord AT newcastle DOT ac DOT uk) provided a
  47 ;; handler for DOI URLs.
  48
  49 ;; Stefan Schlee fixed a bug with handling of colons at the end of
  50 ;; URLs.
  51
  52 ;; Valery V. Vorotyntsev contribued the woman:// protocol handler and
  53 ;; simplified `muse-browse-url-man'.
  54
  55 ;;; Code:
  56
  57 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
  58 ;;
  59 ;; Muse URL Protocols
  60 ;;
  61 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
  62
  63 (require 'info)
  64 (require 'muse-regexps)
  65
  66 (defvar muse-url-regexp nil
  67   "A regexp used to match URLs within a Muse page.
  68 This is autogenerated from `muse-url-protocols'.")
  69
  70 (defun muse-update-url-regexp (sym value)
  71   (setq muse-url-regexp
  72         (concat "\\<\\(" (mapconcat 'car value "\\|") "\\)"
  73                 "[^][" muse-regexp-blank "\"'()<>^`{}\n]*"
  74                 "[^][" muse-regexp-blank "\"'()<>^`{}.,;:\n]+"))
  75   (set sym value))
  76
  77 (defcustom muse-url-protocols
  78   '(("[uU][rR][lL]:" muse-browse-url-url identity)
  79     ("info://" muse-browse-url-info nil)
  80     ("man://" muse-browse-url-man nil)
  81     ("woman://" muse-browse-url-woman nil)
  82     ("google://" muse-browse-url-google muse-resolve-url-google)
  83     ("http:/?/?" browse-url identity)
  84     ("https:/?/?" browse-url identity)
  85     ("ftp:/?/?" browse-url identity)
  86     ("gopher://" browse-url identity)
  87     ("telnet://" browse-url identity)
  88     ("wais://" browse-url identity)
  89     ("file://?" browse-url identity)
  90     ("dict:" muse-browse-url-dict muse-resolve-url-dict)
  91     ("doi:" muse-browse-url-doi muse-resolve-url-doi)
  92     ("news:" browse-url identity)
  93     ("snews:" browse-url identity)
  94     ("mailto:" browse-url identity))
  95   "A list of (PROTOCOL BROWSE-FUN RESOLVE-FUN) used to match URL protocols.
  96 PROTOCOL describes the first part of the URL, including the
  97 \"://\" part.  This may be a regexp.
  98
  99 BROWSE-FUN should accept URL as an argument and open the URL in
 100 the current window.
 101
 102 RESOLVE-FUN should accept URL as an argument and return the final
 103 URL, or nil if no URL should be included."
 104   :type '(repeat (list :tag "Protocol"
 105                        (string :tag "Regexp")
 106                        (function :tag "Browse")
 107                        (choice (function :tag "Resolve")
 108                                (const :tag "Don't resolve" nil))))
 109   :set 'muse-update-url-regexp
 110   :group 'muse)
 111
 112 (add-hook 'muse-update-values-hook
 113           (lambda ()
 114             (muse-update-url-regexp 'muse-url-protocols muse-url-protocols)))
 115
 116 (defcustom muse-wikipedia-country "en"
 117   "Indicate the 2-digit country code that we use for Wikipedia
 118 queries."
 119   :type 'string
 120   :options '("de" "en" "es" "fr" "it" "pl" "pt" "ja" "nl" "sv")
 121   :group 'muse)
 122
 123 (defun muse-protocol-find (proto list)
 124   "Return the first element of LIST whose car matches the regexp PROTO."
 125   (catch 'found
 126     (dolist (item list)
 127       (when (string-match (concat "\\`" (car item)) proto)
 128         (throw 'found item)))))
 129
 130 ;;;###autoload
 131 (defun muse-browse-url (url &optional other-window)
 132   "Handle URL with the function specified in `muse-url-protocols'.
 133 If OTHER-WINDOW is non-nil, open in a different window."
 134   (interactive (list (read-string "URL: ")
 135                      current-prefix-arg))
 136   ;; Strip text properties
 137   (when (fboundp 'set-text-properties)
 138     (set-text-properties 0 (length url) nil url))
 139   (when other-window
 140     (switch-to-buffer-other-window (current-buffer)))
 141   (when (string-match muse-url-regexp url)
 142     (let* ((proto (match-string 1 url))
 143            (entry (muse-protocol-find proto muse-url-protocols)))
 144       (when entry
 145         (funcall (cadr entry) url)))))
 146
 147 (defun muse-resolve-url (url &rest ignored)
 148   "Resolve URL with the function specified in `muse-url-protocols'."
 149   (when (string-match muse-url-regexp url)
 150     (let* ((proto (match-string 1 url))
 151            (entry (muse-protocol-find proto muse-url-protocols)))
 152       (when entry
 153         (let ((func (car (cddr entry))))
 154           (if func
 155               (setq url (funcall func url))
 156             (setq url nil))))))
 157   url)
 158
 159 (defun muse-protocol-add (protocol browse-function resolve-function)
 160   "Add PROTOCOL to `muse-url-protocols'.  PROTOCOL may be a regexp.
 161
 162 BROWSE-FUNCTION should be a function that visits a URL in the
 163 current buffer.
 164
 165 RESOLVE-FUNCTION should be a function that transforms a URL for
 166 publishing or returns nil if not linked."
 167   (add-to-list 'muse-url-protocols
 168                (list protocol browse-function resolve-function))
 169   (muse-update-url-regexp 'muse-url-protocols
 170                           muse-url-protocols))
 171
 172 (defun muse-browse-url-url (url)
 173   "Call `muse-protocol-browse-url' to browse URL.
 174 This is used when we are given something like
 175 \"URL:http://example.org/\".
 176
 177 If you're looking for a good example for how to make a custom URL
 178 handler, look at `muse-browse-url-dict' instead."
 179   (when (string-match "\\`[uU][rR][lL]:\\(.+\\)" url)
 180     (muse-browse-url (match-string 1 url))))
 181
 182 (defun muse-resolve-url-dict (url)
 183   "Return the Wikipedia link corresponding with the given URL."
 184   (when (string-match "\\`dict:\\(.+\\)" url)
 185     (concat "http://" muse-wikipedia-country ".wikipedia.org/"
 186             "wiki/Special:Search?search=" (match-string 1 url))))
 187
 188 (defun muse-browse-url-dict (url)
 189   "If this is a Wikipedia URL, browse it."
 190   (let ((dict-url (muse-resolve-url-dict url)))
 191     (when dict-url
 192       (browse-url dict-url))))
 193
 194 (defun muse-resolve-url-doi (url)
 195   "Return the URL through DOI proxy server."
 196   (when (string-match "\\`doi:\\(.+\\)" url)
 197     (concat "http://dx.doi.org/"
 198             (match-string 1 url))))
 199
 200 (defun muse-browse-url-doi (url)
 201   "If this is a DOI URL, browse it.
 202
 203 DOI's (digitial object identifiers) are a standard identifier
 204 used in the publishing industry."
 205   (let ((doi-url (muse-resolve-url-doi url)))
 206     (when doi-url
 207       (browse-url doi-url))))
 208
 209 (defun muse-resolve-url-google (url)
 210   "Return the correct Google search string."
 211   (when (string-match "\\`google:/?/?\\(.+\\)" url)
 212     (concat "http://www.google.com/search?q="
 213             (match-string 1 url))))
 214
 215 (defun muse-browse-url-google (url)
 216   "If this is a Google URL, jump to it."
 217   (let ((google-url (muse-resolve-url-google url)))
 218     (when google-url
 219       (browse-url google-url))))
 220
 221 (defun muse-browse-url-info (url)
 222   "If this in an Info URL, jump to it."
 223   (require 'info)
 224   (cond
 225    ((string-match "\\`info://\\([^#\n]+\\)#\\(.+\\)" url)
 226     (Info-find-node (match-string 1 url)
 227                     (match-string 2 url)))
 228    ((string-match "\\`info://\\([^#\n]+\\)" url)
 229     (Info-find-node (match-string 1 url)
 230                     "Top"))
 231    ((string-match "\\`info://(\\([^)\n]+\\))\\(.+\\)" url)
 232     (Info-find-node (match-string 1 url) (match-string 2 url)))
 233    ((string-match "\\`info://\\(.+\\)" url)
 234     (Info-find-node (match-string 1 url) "Top"))))
 235
 236 (defun muse-browse-url-man (url)
 237   "If this in a manpage URL, jump to it."
 238   (when (string-match "\\`man://\\([^(]+\\(([^)]+)\\)?\\)" url)
 239     (man (match-string 1 url))))
 240
 241 (defun muse-browse-url-woman (url)
 242   "If this is a WoMan URL, jump to it."
 243   (when (string-match "\\`woman://\\(.+\\)" url)
 244     (woman (match-string 1 url))))
 245
 246 (provide 'muse-protocols)
 247
 248 ;;; muse-protocols.el ends here