lisp/browse-url.el

   1 ;;; browse-url.el --- ask a WWW browser to load a URL
   2
   3 ;; Copyright 1995, 1996 Free Software Foundation, Inc.
   4
   5 ;; Author: Denis Howe <dbh@doc.ic.ac.uk>
   6 ;; Maintainer: Denis Howe <dbh@doc.ic.ac.uk>
   7 ;; Created: 03 Apr 1995
   8 ;; Keywords: hypertext
   9 ;; X-Home page: http://wombat.doc.ic.ac.uk/
  10
  11 ;; This file is part of GNU Emacs.
  12
  13 ;; GNU Emacs is free software; you can redistribute it and/or modify
  14 ;; it under the terms of the GNU General Public License as published by
  15 ;; the Free Software Foundation; either version 2, or (at your option)
  16 ;; any later version.
  17
  18 ;; GNU Emacs is distributed in the hope that it will be useful,
  19 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
  20 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  21 ;; GNU General Public License for more details.
  22
  23 ;; You should have received a copy of the GNU General Public License
  24 ;; along with GNU Emacs; see the file COPYING.  If not, write to the
  25 ;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  26 ;; Boston, MA 02111-1307, USA.
  27
  28 ;;; Commentary:
  29
  30 ;; The latest version of this package should be available from
  31 ;; <URL:http://wombat.doc.ic.ac.uk/emacs/browse-url.el>.
  32
  33 ;; This package provides functions which read a URL (Uniform Resource
  34 ;; Locator) from the minibuffer, defaulting to the URL around point,
  35 ;; and ask a World-Wide Web browser to load it.  It can also load the
  36 ;; URL associated with the current buffer.  Different browsers use
  37 ;; different methods of remote control so there is one function for
  38 ;; each supported browser.  If the chosen browser is not running, it
  39 ;; is started.  Currently there is support for:
  40
  41 ;; Function              Browser     Earliest version
  42 ;; browse-url-netscape   Netscape    1.1b1
  43 ;; browse-url-mosaic     XMosaic     <= 2.4
  44 ;; browse-url-cci        XMosaic     2.5
  45 ;; browse-url-w3         w3          0
  46 ;; browse-url-iximosaic  IXI Mosaic  ?
  47
  48 ;; Note that versions of Netscape before 1.1b1 did not have remote
  49 ;; control.  <URL:http://home.netscape.com/newsref/std/x-remote.html>
  50 ;; and <URL:http://home.netscape.com/info/APIs/>.
  51
  52 ;; Netscape can cache Web pages so it may be necessary to tell it to
  53 ;; reload the current page if it has changed (eg. if you have edited
  54 ;; it).  There is currently no perfect automatic solution to this.
  55
  56 ;; Netscape allows you to specify the id of the window you want to
  57 ;; control but which window DO you want to control and how do you
  58 ;; discover its id?
  59
  60 ;; If using XMosaic before version 2.5, check the definition of
  61 ;; browse-url-usr1-signal below.
  62 ;; <URL:http://www.ncsa.uiuc.edu/SDG/Software/XMosaic/remote-control.html>
  63
  64 ;; XMosaic version 2.5 introduced Common Client Interface allowing you
  65 ;; to control mosaic through Unix sockets.
  66 ;; <URL:http://www.ncsa.uiuc.edu/SDG/Software/XMosaic/CCI/cci-spec.html>
  67
  68 ;; William M. Perry's excellent "w3" WWW browser for
  69 ;; Emacs <URL:ftp://cs.indiana.edu/pub/elisp/w3/>
  70 ;; has a function w3-follow-url-at-point, but that
  71 ;; doesn't let you edit the URL like browse-url.
  72
  73 ;; I recommend Nelson Minar <nelson@santafe.edu>'s excellent
  74 ;; html-helper-mode.el for editing HTML and thank Nelson for
  75 ;; his many useful comments on this code.
  76 ;; <URL:http://www.santafe.edu/~nelson/hhm-beta/>
  77
  78 ;; This package generalises function html-previewer-process in Marc
  79 ;; Andreessen <marca@ncsa.uiuc.edu>'s html-mode (LCD
  80 ;; modes/html-mode.el.Z) and provides better versions of the URL
  81 ;; functions in Michelangelo Grigni <mic@cs.ucsd.edu>'s ffap.el
  82 ;; (find-file-at-point) <URL:ftp://cs.ucsd.edu:/pub/mic/>.  The huge
  83 ;; hyperbole package also contains similar functions.
  84
  85 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
  86 ;; Help!
  87
  88 ;; Can you write and test some code for the Macintrash and Windoze
  89 ;; Netscape remote control APIs?  (See the URL above).
  90
  91 ;; Do any other browsers have remote control?
  92
  93 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
  94 ;; Usage
  95
  96 ;; To display the URL at or before point:
  97 ;; M-x browse-url-at-point RET
  98
  99 ;; To display a URL by shift-clicking on it, put this in your ~/.emacs
 100 ;; file:
 101 ;;      (global-set-key [S-mouse-2] 'browse-url-at-mouse)
 102 ;; (Note that using Shift-mouse-1 is not desirable because
 103 ;; that event has a standard meaning in Emacs.)
 104
 105 ;; To display the current buffer in a web browser:
 106 ;; M-x browse-url-of-buffer RET
 107
 108 ;; In Dired, to display the file named on the current line:
 109 ;; M-x browse-url-of-dired-file RET
 110
 111 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
 112 ;; Customisation (~/.emacs)
 113
 114 ;; To see what variables are available for customization, type `M-x
 115 ;; set-variable browse-url TAB'.
 116
 117 ;; To bind the browse-url commands to keys with the `C-c u' prefix:
 118 ;;      (global-set-key "\C-cu." 'browse-url-at-point)
 119 ;;      (global-set-key "\C-cub" 'browse-url-of-buffer)
 120 ;;      (global-set-key "\C-cuf" 'browse-url-of-file)
 121 ;;      (add-hook 'dired-mode-hook
 122 ;;                (lambda ()
 123 ;;                  (local-set-key "\C-cuf" 'browse-url-of-dired-file))))
 124 ;;      (if (boundp 'browse-url-browser-function)
 125 ;;          (global-set-key "\C-cuu" browse-url-browser-function)
 126 ;;        (eval-after-load
 127 ;;         "browse-url"
 128 ;;         '(global-set-key "\C-cuu" browse-url-browser-function)))
 129
 130 ;; To use the Emacs w3 browser when not running under X11:
 131 ;;      (if (not (eq window-system 'x))
 132 ;;          (setq browse-url-browser-function 'browse-url-w3))
 133
 134 ;; To always save modified buffers before displaying the file in a browser:
 135 ;;      (setq browse-url-save-file t)
 136
 137 ;; To get round the Netscape caching problem, you could try either of
 138 ;; the following (but not both).  EITHER write-file in
 139 ;; html-helper-mode makes Netscape reload document:
 140 ;;
 141 ;;      (autoload 'browse-url-netscape-reload "browse-url"
 142 ;;        "Ask a WWW browser to redisplay the current file." t)
 143 ;;      (add-hook 'html-helper-mode-hook
 144 ;;                (function (lambda ()
 145 ;;                   (add-hook 'local-write-file-hooks
 146 ;;                             (function (lambda ()
 147 ;;                                (let ((local-write-file-hooks))
 148 ;;                                  (save-buffer))
 149 ;;                                (browse-url-netscape-reload)
 150 ;;                                t))                   ; => file written by hook
 151 ;;                             t))))                    ; append to l-w-f-hooks
 152 ;;
 153 ;; [Does this work for html-mode too?]
 154 ;;
 155 ;; OR browse-url-of-file ask Netscape to load and then reload the
 156 ;; file:
 157 ;;
 158 ;;      (add-hook 'browse-url-of-file-hook 'browse-url-netscape-reload)
 159
 160 ;; You may also want to customise browse-url-netscape-arguments, eg.
 161 ;;
 162 ;;      (setq browse-url-netscape-arguments '("-install"))
 163 ;;
 164 ;; or similarly for the other browsers.
 165
 166 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
 167 ;;; Change Log:
 168
 169 ;; 0.00 03 Apr 1995 Denis Howe <dbh@doc.ic.ac.uk>
 170 ;;      Created.
 171
 172 ;; 0.01 04 Apr 1995
 173 ;;      All names start with "browse-url-".  Added provide.
 174
 175 ;; 0.02 05 Apr 1995
 176 ;;      Save file at start of browse-url-of-file.
 177 ;;      Use start-process instead of start-process-shell-command.
 178
 179 ;; 0.03 06 Apr 1995
 180 ;;      Add browse-url-netscape-reload, browse-url-netscape-command.
 181 ;;      browse-url-of-file save file option.
 182
 183 ;; 0.04 08 Apr 1995
 184 ;;      b-u-file-url separate function.  Change b-u-filename-alist
 185 ;;      default.
 186
 187 ;; 0.05 09 Apr 1995
 188 ;;      Added b-u-of-file-hook.
 189
 190 ;; 0.06 11 Apr 1995
 191 ;;      Improved .emacs suggestions and documentation.
 192
 193 ;; 0.07 13 Apr 1995
 194 ;;      Added browse-url-interactive-arg optional prompt.
 195
 196 ;; 0.08 18 Apr 1995
 197 ;;      Exclude final "." from browse-url-regexp.
 198
 199 ;; 0.09 21 Apr 1995
 200 ;;      Added mouse-set-point to browse-url-interactive-arg.
 201
 202 ;; 0.10 24 Apr 1995
 203 ;;      Added Mosaic signal sending variations.
 204 ;;      Thanks Brian K Servis <servis@ecn.purdue.edu>.
 205 ;;      Don't use xprop for Netscape.
 206
 207 ;; 0.11 25 Apr 1995
 208 ;;      Fix reading of ~/.mosaicpid.  Thanks Dag.H.Wanvik@kvatro.no.
 209
 210 ;; 0.12 27 Apr 1995
 211 ;;      Interactive prefix arg => URL *after* point.
 212 ;;      Thanks Michelangelo Grigni <mic@cs.ucsd.edu>.
 213 ;;      Added IXI Mosaic support.
 214 ;;      Thanks David Karr <dkarr@nmo.gtegsc.com>.
 215
 216 ;; 0.13 28 Apr 1995
 217 ;;      Exclude final [,;] from browse-url-regexp.
 218
 219 ;; 0.14 02 May 1995
 220 ;;      Provide browser argument variables.
 221
 222 ;; 0.15 07 May 1995
 223 ;;      More Netscape options.  Thanks Peter Arius
 224 ;;      <arius@immd2.informatik.uni-erlangen.de>.
 225
 226 ;; 0.16 17 May 1995
 227 ;;      Added browse-url-at-mouse.
 228 ;;      Thanks Wayne Mesard <wmesard@sgi.com>
 229
 230 ;; 0.17 27 Jun 1995
 231 ;;      Renamed browse-url-at-point to browse-url-url-at-point.
 232 ;;      Added browse-url-at-point.
 233 ;;      Thanks Jonathan Cano <cano@patch.tandem.com>.
 234
 235 ;; 0.18 16 Aug 1995
 236 ;;      Fixed call to browse-url-url-at-point in browse-url-at-point.
 237 ;;      Thanks Eric Ding <ericding@San-Jose.ate.slb.com>.
 238
 239 ;; 0.19 24 Aug 1995
 240 ;;      Improved documentation.
 241 ;;      Thanks Kevin Rodgers <kevin.rodgers@ihs.com>.
 242
 243 ;; 0.20 31 Aug 1995
 244 ;;      browse-url-of-buffer to handle file-less buffers.
 245 ;;      browse-url-of-dired-file browses current file in dired.
 246 ;;      Thanks Kevin Rodgers <kevin.rodgers@ihs.com>.
 247
 248 ;; 0.21 09 Sep 1995
 249 ;;      XMosaic CCI functions.
 250 ;;      Thanks Marc Furrer <Marc.Furrer@di.epfl.ch>.
 251
 252 ;; 0.22 13 Sep 1995
 253 ;;      Fixed new-window documentation and added to browse-url-cci.
 254 ;;      Thanks Dilip Sequeira <djs@dcs.ed.ac.uk>.
 255
 256 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
 257 ;;; Code:
 258
 259 (defvar browse-url-regexp
 260   "\\(https?://\\|ftp://\\|gopher://\\|telnet://\\|wais://\\|file:/\\|s?news:\\|mailto:\\)[^]\t\n \"'()<>[^`{}]*[^]\t\n \"'()<>[^`{}.,;]+"
 261   "A regular expression probably matching a URL.")
 262
 263 (defvar browse-url-browser-function
 264   'browse-url-netscape
 265   "*Function to display the current buffer in a WWW browser.
 266 Used by the `browse-url-at-point', `browse-url-at-mouse', and
 267 `browse-url-of-file' commands.")
 268
 269 (defvar browse-url-netscape-program "netscape"
 270   "*The name for invoking Netscape.")
 271
 272 (defvar browse-url-netscape-arguments nil
 273   "*A list of strings to pass to Netscape as arguments.")
 274
 275 (defvar browse-url-new-window-p nil
 276   "*If non-nil, always open a new browser window.
 277 Passing an interactive argument to \\[browse-url-netscape] or
 278 \\[browse-url-cci] reverses the effect of this variable.  Requires
 279 Netscape version 1.1N or later or XMosaic version 2.5 or later.")
 280
 281 (defvar browse-url-mosaic-program "xmosaic"
 282   "*The name for invoking Mosaic.")
 283
 284 (defvar browse-url-mosaic-arguments nil
 285   "*A list of strings to pass to Mosaic as arguments.")
 286
 287 (defvar browse-url-filename-alist
 288   '(("^/+" . "file:/"))
 289   "An alist of (REGEXP . STRING) pairs.
 290 Any substring of a filename matching one of the REGEXPs is replaced by
 291 the corresponding STRING.  All pairs are applied in the order given.
 292 Used by the `browse-url-of-file' command.")
 293
 294 (defvar browse-url-save-file nil
 295   "If non-nil, save the buffer before displaying its file.
 296 Used by the `browse-url-of-file' command.")
 297
 298 (defvar browse-url-of-file-hook nil
 299   "A hook to be run with run-hook after `browse-url-of-file' has asked
 300 a browser to load a file.
 301
 302 Set this to `browse-url-netscape-reload' to force Netscape to load the
 303 file rather than displaying a cached copy.")
 304
 305 (defvar browse-url-usr1-signal
 306   (if (and (boundp 'emacs-major-version)
 307            (or (> emacs-major-version 19) (>= emacs-minor-version 29)))
 308       'SIGUSR1
 309     30)                                 ; Check /usr/include/signal.h.
 310   "The argument to `signal-process' for sending SIGUSR1 to XMosaic.
 311 Emacs 19.29 accepts 'SIGUSR1, earlier versions require an integer
 312 which is 30 on SunOS and 16 on HP-UX and Solaris.")
 313
 314 (defvar browse-url-CCI-port 3003
 315   "Port to access XMosaic via CCI.
 316 This can be any number between 1024 and 65535 but must correspond to
 317 the value set in the browser.")
 318
 319 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
 320 ;; URL input
 321
 322 ;; thingatpt.el doesn't work for complex regexps.
 323
 324 (defun browse-url-url-at-point ()
 325   "Return the URL around or before point.
 326 Then search backwards for the start of a URL.  If no URL found, return
 327 the empty string."
 328   (if (or (looking-at browse-url-regexp)        ; Already at start
 329           (let ((eol (save-excursion (end-of-line) (point))))
 330             ;; Search forwards for the next URL or end of line in case
 331             ;; we're in the middle of one.
 332             (and (re-search-forward browse-url-regexp eol 'lim)
 333                  (goto-char (match-beginning 0)))
 334             ;; Now back to where we started or earlier.
 335             (re-search-backward browse-url-regexp nil t)))
 336       (buffer-substring (match-beginning 0) (match-end 0))
 337     ""))                                ; No match
 338
 339 ;; Todo: restrict to around or immediately before point.  Expand bare
 340 ;; hostname to URL.
 341
 342 (defun browse-url-interactive-arg (&optional prompt)
 343   "Read a URL from the minibuffer, optionally prompting with PROMPT.
 344 Default to the URL at or before point.  If bound to a mouse button,
 345 set point to the position clicked.  Return the result as a list for
 346 use in `interactive'."
 347   (let ((event (elt (this-command-keys) 0)))
 348     (and (listp event) (mouse-set-point event)))
 349   (list (read-string (or prompt "URL: ") (browse-url-url-at-point))))
 350
 351 ;;;###autoload
 352 (defun browse-url-at-point ()
 353   "Ask a WWW browser to load the URL at or before point.
 354 The URL is loaded according to the value of `browse-url-browser-function'."
 355   (interactive)
 356   (funcall browse-url-browser-function (browse-url-url-at-point)))
 357
 358 ;;;###autoload
 359 (defun browse-url-at-mouse (event)
 360   "Ask a WWW browser to load a URL clicked with the mouse.
 361 The URL is the one around or before the position of the mouse click
 362 but point is not changed.  The URL is loaded according to the value of
 363 `browse-url-browser-function'."
 364   (interactive "e")
 365   (save-excursion
 366     (let ((posn (event-start event)))
 367       (set-buffer (window-buffer (posn-window posn)))
 368       (goto-char (posn-point posn))
 369       (let ((url (browse-url-url-at-point)))
 370         (if (string-equal url "")
 371             (error "No URL found"))
 372         (funcall browse-url-browser-function url)))))
 373
 374 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
 375 ;; Browse current buffer
 376
 377 ;;;###autoload
 378 (defun browse-url-of-file (&optional file)
 379   "Ask a WWW browser to display FILE.
 380 Display the current buffer's file if FILE is nil or if called
 381 interactively.  Turn the filename into a URL by performing
 382 replacements given in variable `browse-url-filename-alist'.  Pass the
 383 URL to a browser using variable `browse-url-browser-function' then run
 384 `browse-url-of-file-hook'."
 385   (interactive)
 386   (setq file
 387         (or file
 388             (buffer-file-name)
 389             (error "Current buffer has no file")))
 390   (let ((buf (get-file-buffer file)))
 391     (if buf
 392         (save-excursion
 393           (set-buffer buf)
 394           (cond ((not (buffer-modified-p)))
 395                 (browse-url-save-file (save-buffer))
 396                 (t (message "%s modified since last save" file))))))
 397   (funcall browse-url-browser-function (browse-url-file-url file))
 398   (run-hooks 'browse-url-of-file-hook))
 399
 400 (defun browse-url-file-url (file)
 401   "Return the URL corresponding to FILE.
 402 Uses variable `browse-url-filename-alist' to map filenames to URLs."
 403   (let ((maps browse-url-filename-alist))
 404     (while maps
 405       (let* ((map (car maps))
 406              (from-re (car map))
 407              (to-string (cdr map)))
 408         (setq maps (cdr maps))
 409         (if (string-match from-re file)
 410             (setq file (concat (substring file 0 (match-beginning 0))
 411                                to-string
 412                                (substring file (match-end 0))))))))
 413   file)
 414
 415 (defvar browse-url-temp-file-name nil)
 416 (make-variable-buffer-local 'browse-url-temp-file-name)
 417
 418 (defvar browse-url-temp-file-list '())
 419
 420 ;;;###autoload
 421 (defun browse-url-of-buffer (&optional buffer)
 422   "Ask a WWW browser to display BUFFER.
 423 Display the current buffer if BUFFER is nil."
 424   (interactive)
 425   (save-excursion
 426     (set-buffer (or buffer (current-buffer)))
 427     (let ((file-name
 428            (or buffer-file-name
 429                (and (boundp 'dired-directory) dired-directory))))
 430       (if (null file-name)
 431           (progn
 432             (if (null browse-url-temp-file-name)
 433                 (progn
 434                   (setq browse-url-temp-file-name
 435                         (make-temp-name
 436                          (expand-file-name (buffer-name)
 437                                            (or (getenv "TMPDIR") "/tmp"))))
 438                   (setq browse-url-temp-file-list
 439                         (cons browse-url-temp-file-name
 440                               browse-url-temp-file-list))))
 441             (write-region (point-min) (point-max) browse-url-temp-file-name
 442                           nil 'no-message)))
 443       (browse-url-of-file (or file-name browse-url-temp-file-name)))))
 444
 445 (defun browse-url-delete-temp-file (&optional temp-file-name)
 446   ;; Delete browse-url-temp-file-name from the file system and from
 447   ;; browse-url-temp-file-list.  If optional arg TEMP-FILE-NAME is
 448   ;; non-nil, delete it instead, but only from the file system --
 449   ;; browse-url-temp-file-list is not affected.
 450   (let ((file-name (or temp-file-name browse-url-temp-file-name)))
 451     (if (and file-name (file-exists-p file-name))
 452         (progn
 453           (delete-file file-name)
 454           (if (null temp-file-name)
 455               (setq browse-url-temp-file-list
 456                     (delete browse-url-temp-file-name
 457                             browse-url-temp-file-list)))))))
 458
 459 (defun browse-url-delete-temp-file-list ()
 460   ;; Delete all elements of browse-url-temp-file-list.
 461   (while browse-url-temp-file-list
 462     (browse-url-delete-temp-file (car browse-url-temp-file-list))
 463     (setq browse-url-temp-file-list
 464           (cdr browse-url-temp-file-list))))
 465
 466 (add-hook 'kill-buffer-hook 'browse-url-delete-temp-file)
 467 (add-hook 'kill-emacs-hook 'browse-url-delete-temp-file-list)
 468
 469 ;;;###autoload
 470 (defun browse-url-of-dired-file ()
 471   "In Dired, ask a WWW browser to display the file named on this line."
 472   (interactive)
 473   (browse-url-of-file (dired-get-filename)))
 474
 475 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
 476 ;; Browser-specific functions
 477
 478 (defun browse-url-netscape (url &optional new-window)
 479   "Ask the Netscape WWW browser to load URL.
 480
 481 Default to the URL around or before point.  The strings in variable
 482 `browse-url-netscape-arguments' are also passed to Netscape.
 483
 484 When called interactively, if variable `browse-url-new-window-p' is
 485 non-nil, load the document in a new Netscape window, otherwise use a
 486 random existing one.  A non-nil interactive prefix argument reverses
 487 the effect of browse-url-new-window-p.
 488
 489 When called non-interactively, optional second argument NEW-WINDOW is
 490 used instead of browse-url-new-window-p."
 491
 492   (interactive (append (browse-url-interactive-arg "Netscape URL: ")
 493                        (list (not (eq (null browse-url-new-window-p)
 494                                       (null current-prefix-arg))))))
 495   (let ((res
 496          (apply 'call-process browse-url-netscape-program nil nil nil
 497                 (append browse-url-netscape-arguments
 498                         (if new-window '("-noraise"))
 499                         (list "-remote"
 500                               (concat "openURL(" url
 501                                       (if new-window ",new-window")
 502                                       ")"))))
 503          ))
 504     (if (stringp res)
 505         (error "netscape got signal: %s" res)
 506       (or (zerop res)
 507           (progn                        ; Netscape not running - start it
 508             (message "Starting Netscape...")
 509             (apply 'start-process "netscape" nil browse-url-netscape-program
 510                    (append browse-url-netscape-arguments (list url))))))))
 511
 512 (defun browse-url-netscape-reload ()
 513   "Ask Netscape to reload its current document."
 514   (interactive)
 515   (browse-url-netscape-command "reload"))
 516
 517 (defun browse-url-netscape-command (command)
 518   "Send a remote control command to Netscape."
 519   (apply 'start-process "netscape" nil "netscape"
 520          (append browse-url-netscape-arguments
 521                  (list "-remote" command))))
 522
 523 (defun browse-url-mosaic (url)
 524   "Ask the XMosaic WWW browser to load URL.
 525 Default to the URL around or before point."
 526   (interactive (browse-url-interactive-arg "Mosaic URL: "))
 527   (let ((pidfile (expand-file-name "~/.mosaicpid"))
 528         pid pidbuf)
 529     (if (file-readable-p pidfile)
 530         (save-excursion
 531           (find-file pidfile)
 532           (goto-char (point-min))
 533           (setq pid (read (current-buffer)))
 534           (kill-buffer nil)))
 535     (if (and pid (zerop (signal-process pid 0))) ; Mosaic running
 536         (save-excursion
 537           (find-file (format "/tmp/Mosaic.%d" pid))
 538           (erase-buffer)
 539           (insert "goto\n" url "\n")
 540           (save-buffer)
 541           (kill-buffer nil)
 542           ;; Send signal SIGUSR to Mosaic
 543           (signal-process pid browse-url-usr1-signal)
 544           (message "Signal sent to Mosaic")
 545           ;; Or you could try:
 546           ;; (call-process "kill" nil 0 nil "-USR1" (int-to-string pid))
 547           )
 548       ;; Mosaic not running - start it
 549       (message "Starting Mosaic...")
 550       (apply 'start-process "xmosaic" nil browse-url-mosaic-program
 551              (append browse-url-mosaic-arguments (list url)))
 552       (message "Starting Mosaic...done"))))
 553
 554 (defun browse-url-cci (url &optional new-window)
 555   "Ask the XMosaic WWW browser to load URL.
 556 Default to the URL around or before point.
 557
 558 This function only works for XMosaic version 2.5 or later.  You must
 559 select `CCI' from XMosaic's File menu, set the CCI Port Address to the
 560 value of variable `browse-url-CCI-port', and enable `Accept requests'.
 561
 562 When called interactively, if variable `browse-url-new-window-p' is
 563 non-nil, load the document in a new browser window, otherwise use a
 564 random existing one.  A non-nil interactive prefix argument reverses
 565 the effect of browse-url-new-window-p.
 566
 567 When called non-interactively, optional second argument NEW-WINDOW is
 568 used instead of browse-url-new-window-p."
 569   (interactive (append (browse-url-interactive-arg "Mosaic URL: ")
 570                        (list (not (eq (null browse-url-new-window-p)
 571                                       (null current-prefix-arg))))))
 572   (open-network-stream "browse-url" " *browse-url*"
 573                        "localhost" browse-url-CCI-port)
 574   ;; Todo: start browser if fails
 575   (process-send-string "browse-url"
 576                        (concat "get url (" url ") output "
 577                                (if new-window "new" "current") "\r\n"))
 578   (process-send-string "browse-url" "disconnect\r\n")
 579   (delete-process "browse-url"))
 580
 581 (defun browse-url-iximosaic (url)
 582   "Ask the IXIMosaic WWW browser to load URL.
 583 Default to the URL around or before point."
 584   (interactive (browse-url-interactive-arg "IXI Mosaic URL: "))
 585   (start-process "tellw3b" nil "tellw3b"
 586                  "-service WWW_BROWSER ixi_showurl " url))
 587
 588 (defun browse-url-w3 (url)
 589   "Ask the w3 WWW browser to load URL.
 590 Default to the URL around or before point."
 591   (interactive (browse-url-interactive-arg "W3 URL: "))
 592   (w3-fetch url))
 593
 594 (provide 'browse-url)
 595
 596 ;;; browse-url.el ends here