lisp/browse-url.el

   1 ;;; browse-url.el --- ask a WWW browser to load a URL
   2 ;; Copyright 1995 Free Software Foundation, Inc.
   3
   4 ;; Author: Denis Howe <dbh@doc.ic.ac.uk>
   5 ;; Maintainer: Denis Howe <dbh@doc.ic.ac.uk>
   6 ;; Created: 03 Apr 1995
   7 ;; Keywords: hypertext
   8 ;; X-Home page: http://wombat.doc.ic.ac.uk/
   9
  10 ;; This file is part of GNU Emacs.
  11
  12 ;; GNU Emacs is free software; you can redistribute it and/or modify
  13 ;; it under the terms of the GNU General Public License as published
  14 ;; by the Free Software Foundation; either version 2, or (at your
  15 ;; option) any later version.
  16
  17 ;; GNU Emacs is distributed in the hope that it will be useful, but
  18 ;; WITHOUT ANY WARRANTY; without even the implied warranty of
  19 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  20 ;; General Public License for more details.
  21
  22 ;; You should have received a copy of the GNU General Public License
  23 ;; along with GNU Emacs; see the file COPYING.  If not, write to the
  24 ;; Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
  25
  26 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
  27 ;;; Commentary:
  28
  29 ;; The latest version of this package should be available from
  30 ;; <URL:http://wombat.doc.ic.ac.uk/emacs/browse-url.el>.
  31
  32 ;; This package provides functions which read a URL (Uniform Resource
  33 ;; Locator) from the minibuffer, defaulting to the URL around point,
  34 ;; and ask a World-Wide Web browser to load it.  It can also load the
  35 ;; URL associated with the current buffer.  Different browsers use
  36 ;; different methods of remote control so there is one function for
  37 ;; each supported browser.  If the chosen browser is not running, it
  38 ;; is started.  Currently there is support for:
  39
  40 ;; Function              Browser     Earliest version
  41 ;; browse-url-netscape   Netscape    1.1b1
  42 ;; browse-url-mosaic     XMosaic     <= 2.4
  43 ;; browse-url-cci        XMosaic     2.5
  44 ;; browse-url-w3         w3          0
  45 ;; browse-url-iximosaic  IXI Mosaic  ?
  46
  47 ;; Note that versions of Netscape before 1.1b1 did not have remote
  48 ;; control.  <URL:http://home.netscape.com/newsref/std/x-remote.html>
  49 ;; and <URL:http://home.netscape.com/info/APIs/>.
  50
  51 ;; Netscape can cache Web pages so it may be necessary to tell it to
  52 ;; reload the current page if it has changed (eg. if you have edited
  53 ;; it).  There is currently no perfect automatic solution to this.
  54
  55 ;; Netscape allows you to specify the id of the window you want to
  56 ;; control but which window DO you want to control and how do you
  57 ;; discover its id?
  58
  59 ;; If using XMosaic before version 2.5, check the definition of
  60 ;; browse-url-usr1-signal below.
  61 ;; <URL:http://www.ncsa.uiuc.edu/SDG/Software/XMosaic/remote-control.html>
  62
  63 ;; XMosaic version 2.5 introduced Common Client Interface allowing you
  64 ;; to control mosaic through Unix sockets.
  65 ;; <URL:http://www.ncsa.uiuc.edu/SDG/Software/XMosaic/CCI/cci-spec.html>
  66
  67 ;; William M. Perry's excellent "w3" WWW browser for
  68 ;; Emacs <URL:ftp://cs.indiana.edu/pub/elisp/w3/>
  69 ;; has a function w3-follow-url-at-point, but that
  70 ;; doesn't let you edit the URL like browse-url.
  71
  72 ;; I recommend Nelson Minar <nelson@santafe.edu>'s excellent
  73 ;; html-helper-mode.el for editing HTML and thank Nelson for
  74 ;; his many useful comments on this code.
  75 ;; <URL:http://www.santafe.edu/~nelson/hhm-beta/>
  76
  77 ;; This package generalises function html-previewer-process in Marc
  78 ;; Andreessen <marca@ncsa.uiuc.edu>'s html-mode (LCD
  79 ;; modes/html-mode.el.Z) and provides better versions of the URL
  80 ;; functions in Michelangelo Grigni <mic@cs.ucsd.edu>'s ffap.el
  81 ;; (find-file-at-point) <URL:ftp://cs.ucsd.edu:/pub/mic/>.  The huge
  82 ;; hyperbole package also contains similar functions.
  83
  84 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
  85 ;; Help!
  86
  87 ;; Can you write and test some code for the Macintrash and Windoze
  88 ;; Netscape remote control APIs?  (See the URL above).
  89
  90 ;; Do any other browsers have remote control?
  91
  92 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
  93 ;; Installation
  94
  95 ;; Put the following in your ~/.emacs file:
  96 ;;
  97 ;; (autoload 'browse-url-at-point "browse-url"
  98 ;;   "Ask a WWW browser to load the URL at or before point." t)
  99 ;; (autoload 'browse-url-at-mouse "browse-url"
 100 ;;   "Ask a WWW browser to load a URL clicked with the mouse." t)
 101 ;; (autoload 'browse-url-of-buffer "browse-url"
 102 ;;   "Ask a WWW browser to display BUFFER." t)
 103 ;; (autoload 'browse-url-of-file "browse-url"
 104 ;;   "Ask a WWW browser to display FILE." t)
 105 ;; (autoload 'browse-url-of-dired-file "browse-url"
 106 ;;   "In Dired, ask a WWW browser to display the file named on this line." t)
 107
 108 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
 109 ;; Usage
 110
 111 ;; To display the URL at or before point:
 112 ;; M-x browse-url-at-point RET
 113
 114 ;; To display a URL by shift-clicking on it, put this in your ~/.emacs
 115 ;; file:
 116 ;;      (global-set-key [S-mouse-1] 'browse-url-at-mouse)
 117
 118 ;; To display the current buffer in a web browser:
 119 ;; M-x browse-url-of-buffer RET
 120
 121 ;; In Dired, to display the file named on the current line:
 122 ;; M-x browse-url-of-dired-file RET
 123
 124 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
 125 ;; Customisation (~/.emacs)
 126
 127 ;; To see what variables are available for customization, type `M-x
 128 ;; set-variable browse-url TAB'.
 129
 130 ;; To bind the browse-url commands to keys with the `C-c u' prefix:
 131 ;;      (global-set-key "\C-cu." 'browse-url-at-point)
 132 ;;      (global-set-key "\C-cub" 'browse-url-of-buffer)
 133 ;;      (global-set-key "\C-cuf" 'browse-url-of-file)
 134 ;;      (add-hook 'dired-mode-hook
 135 ;;                (lambda ()
 136 ;;                  (local-set-key "\C-cuf" 'browse-url-of-dired-file))))
 137 ;;      (if (boundp 'browse-url-browser-function)
 138 ;;          (global-set-key "\C-cuu" browse-url-browser-function)
 139 ;;        (eval-after-load
 140 ;;         "browse-url"
 141 ;;         '(global-set-key "\C-cuu" browse-url-browser-function)))
 142
 143 ;; To use the Emacs w3 browser when not running under X11:
 144 ;;      (if (not (eq window-system 'x))
 145 ;;          (setq browse-url-browser-function 'browse-url-w3))
 146
 147 ;; To always save modified buffers before displaying the file in a browser:
 148 ;;      (setq browse-url-save-file t)
 149
 150 ;; To get round the Netscape caching problem, you could try either of
 151 ;; the following (but not both).  EITHER write-file in
 152 ;; html-helper-mode makes Netscape reload document:
 153 ;;
 154 ;;      (autoload 'browse-url-netscape-reload "browse-url"
 155 ;;        "Ask a WWW browser to redisplay the current file." t)
 156 ;;      (add-hook 'html-helper-mode-hook
 157 ;;                (function (lambda ()
 158 ;;                   (add-hook 'local-write-file-hooks
 159 ;;                             (function (lambda ()
 160 ;;                                (let ((local-write-file-hooks))
 161 ;;                                  (save-buffer))
 162 ;;                                (browse-url-netscape-reload)
 163 ;;                                t))                   ; => file written by hook
 164 ;;                             t))))                    ; append to l-w-f-hooks
 165 ;;
 166 ;; [Does this work for html-mode too?]
 167 ;;
 168 ;; OR browse-url-of-file ask Netscape to load and then reload the
 169 ;; file:
 170 ;;
 171 ;;      (add-hook 'browse-url-of-file-hook 'browse-url-netscape-reload)
 172
 173 ;; You may also want to customise browse-url-netscape-arguments, eg.
 174 ;;
 175 ;;      (setq browse-url-netscape-arguments '("-install"))
 176 ;;
 177 ;; or similarly for the other browsers.
 178
 179 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
 180 ;;; Change Log:
 181
 182 ;; 0.00 03 Apr 1995 Denis Howe <dbh@doc.ic.ac.uk>
 183 ;;      Created.
 184
 185 ;; 0.01 04 Apr 1995
 186 ;;      All names start with "browse-url-".  Added provide.
 187
 188 ;; 0.02 05 Apr 1995
 189 ;;      Save file at start of browse-url-of-file.
 190 ;;      Use start-process instead of start-process-shell-command.
 191
 192 ;; 0.03 06 Apr 1995
 193 ;;      Add browse-url-netscape-reload, browse-url-netscape-command.
 194 ;;      browse-url-of-file save file option.
 195
 196 ;; 0.04 08 Apr 1995
 197 ;;      b-u-file-url separate function.  Change b-u-filename-alist
 198 ;;      default.
 199
 200 ;; 0.05 09 Apr 1995
 201 ;;      Added b-u-of-file-hook.
 202
 203 ;; 0.06 11 Apr 1995
 204 ;;      Improved .emacs suggestions and documentation.
 205
 206 ;; 0.07 13 Apr 1995
 207 ;;      Added browse-url-interactive-arg optional prompt.
 208
 209 ;; 0.08 18 Apr 1995
 210 ;;      Exclude final "." from browse-url-regexp.
 211
 212 ;; 0.09 21 Apr 1995
 213 ;;      Added mouse-set-point to browse-url-interactive-arg.
 214
 215 ;; 0.10 24 Apr 1995
 216 ;;      Added Mosaic signal sending variations.
 217 ;;      Thanks Brian K Servis <servis@ecn.purdue.edu>.
 218 ;;      Don't use xprop for Netscape.
 219
 220 ;; 0.11 25 Apr 1995
 221 ;;      Fix reading of ~/.mosaicpid.  Thanks Dag.H.Wanvik@kvatro.no.
 222
 223 ;; 0.12 27 Apr 1995
 224 ;;      Interactive prefix arg => URL *after* point.
 225 ;;      Thanks Michelangelo Grigni <mic@cs.ucsd.edu>.
 226 ;;      Added IXI Mosaic support.
 227 ;;      Thanks David Karr <dkarr@nmo.gtegsc.com>.
 228
 229 ;; 0.13 28 Apr 1995
 230 ;;      Exclude final [,;] from browse-url-regexp.
 231
 232 ;; 0.14 02 May 1995
 233 ;;      Provide browser argument variables.
 234
 235 ;; 0.15 07 May 1995
 236 ;;      More Netscape options.  Thanks Peter Arius
 237 ;;      <arius@immd2.informatik.uni-erlangen.de>.
 238
 239 ;; 0.16 17 May 1995
 240 ;;      Added browse-url-at-mouse.
 241 ;;      Thanks Wayne Mesard <wmesard@sgi.com>
 242
 243 ;; 0.17 27 Jun 1995
 244 ;;      Renamed browse-url-at-point to browse-url-url-at-point.
 245 ;;      Added browse-url-at-point.
 246 ;;      Thanks Jonathan Cano <cano@patch.tandem.com>.
 247
 248 ;; 0.18 16 Aug 1995
 249 ;;      Fixed call to browse-url-url-at-point in browse-url-at-point.
 250 ;;      Thanks Eric Ding <ericding@San-Jose.ate.slb.com>.
 251
 252 ;; 0.19 24 Aug 1995
 253 ;;      Improved documentation.
 254 ;;      Thanks Kevin Rodgers <kevin.rodgers@ihs.com>.
 255
 256 ;; 0.20 31 Aug 1995
 257 ;;      browse-url-of-buffer to handle file-less buffers.
 258 ;;      browse-url-of-dired-file browses current file in dired.
 259 ;;      Thanks Kevin Rodgers <kevin.rodgers@ihs.com>.
 260
 261 ;; 0.21 09 Sep 1995
 262 ;;      XMosaic CCI functions.
 263 ;;      Thanks Marc Furrer <Marc.Furrer@di.epfl.ch>.
 264
 265 ;; 0.22 13 Sep 1995
 266 ;;      Fixed new-window documentation and added to browse-url-cci.
 267 ;;      Thanks Dilip Sequeira <djs@dcs.ed.ac.uk>.
 268
 269 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
 270 ;;; Code:
 271
 272 (defvar browse-url-regexp
 273   "\\(https?://\\|ftp://\\|gopher://\\|telnet://\\|wais://\\|file:/\\|s?news:\\|mailto:\\)[^]\t\n \"'()<>[^`{}]*[^]\t\n \"'()<>[^`{}.,;]+"
 274   "A regular expression probably matching a URL.")
 275
 276 (defvar browse-url-browser-function
 277   'browse-url-netscape
 278   "*Function to display the current buffer in a WWW browser.
 279 Used by the `browse-url-at-point', `browse-url-at-mouse', and
 280 `browse-url-of-file' commands.")
 281
 282 (defvar browse-url-netscape-arguments nil
 283   "*A list of strings to pass to Netscape as arguments.")
 284
 285 (defvar browse-url-new-window-p nil
 286   "*If non-nil, always open a new browser window.
 287 Passing an interactive argument to \\[browse-url-netscape] or
 288 \\[browse-url-cci] reverses the effect of this variable.  Requires
 289 Netscape version 1.1N or later or XMosaic version 2.5 or later.")
 290
 291 (defvar browse-url-mosaic-arguments nil
 292   "*A list of strings to pass to Mosaic as arguments.")
 293
 294 (defvar browse-url-filename-alist
 295   '(("^/+" . "file:/"))
 296   "An alist of (REGEXP . STRING) pairs.
 297 Any substring of a filename matching one of the REGEXPs is replaced by
 298 the corresponding STRING.  All pairs are applied in the order given.
 299 Used by the `browse-url-of-file' command.")
 300
 301 (defvar browse-url-save-file nil
 302   "If non-nil, save the buffer before displaying its file.
 303 Used by the `browse-url-of-file' command.")
 304
 305 (defvar browse-url-of-file-hook nil
 306   "A hook to be run with run-hook after `browse-url-of-file' has asked
 307 a browser to load a file.
 308
 309 Set this to `browse-url-netscape-reload' to force Netscape to load the
 310 file rather than displaying a cached copy.")
 311
 312 (defvar browse-url-usr1-signal
 313   (if (and (boundp 'emacs-major-version)
 314            (or (> emacs-major-version 19) (>= emacs-minor-version 29)))
 315       'sigusr1
 316     30)                                 ; Check /usr/include/signal.h.
 317   "The argument to `signal-process' for sending SIGUSR1 to XMosaic.
 318 Emacs 19.29 accepts 'sigusr1, earlier versions require an integer
 319 which is 30 on SunOS and 16 on HP-UX and Solaris.")
 320
 321 (defvar browse-url-CCI-port 3003
 322   "Port to access XMosaic via CCI.
 323 This can be any number between 1024 and 65535 but must correspond to
 324 the value set in the browser.")
 325
 326 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
 327 ;; URL input
 328
 329 ;; thingatpt.el doesn't work for complex regexps.
 330
 331 (defun browse-url-url-at-point ()
 332   "Return the URL around or before point.
 333 Then search backwards for the start of a URL.  If no URL found, return
 334 the empty string."
 335   (if (or (looking-at browse-url-regexp)        ; Already at start
 336           (let ((eol (save-excursion (end-of-line) (point))))
 337             ;; Search forwards for the next URL or end of line in case
 338             ;; we're in the middle of one.
 339             (and (re-search-forward browse-url-regexp eol 'lim)
 340                  (goto-char (match-beginning 0)))
 341             ;; Now back to where we started or earlier.
 342             (re-search-backward browse-url-regexp nil t)))
 343       (buffer-substring (match-beginning 0) (match-end 0))
 344     ""))                                ; No match
 345
 346 ;; Todo: restrict to around or immediately before point.  Expand bare
 347 ;; hostname to URL.
 348
 349 (defun browse-url-interactive-arg (&optional prompt)
 350   "Read a URL from the minibuffer, optionally prompting with PROMPT.
 351 Default to the URL at or before point.  If bound to a mouse button,
 352 set point to the position clicked.  Return the result as a list for
 353 use in `interactive'."
 354   (let ((event (elt (this-command-keys) 0)))
 355     (and (listp event) (mouse-set-point event)))
 356   (list (read-string (or prompt "URL: ") (browse-url-url-at-point))))
 357
 358 (defun browse-url-at-point ()
 359   "Ask a WWW browser to load the URL at or before point.
 360 The URL is loaded according to the value of `browse-url-browser-function'."
 361   (interactive)
 362   (funcall browse-url-browser-function (browse-url-url-at-point)))
 363
 364 (defun browse-url-at-mouse (event)
 365   "Ask a WWW browser to load a URL clicked with the mouse.
 366 The URL is the one around or before the position of the mouse click
 367 but point is not changed.  The URL is loaded according to the value of
 368 `browse-url-browser-function'."
 369   (interactive "e")
 370   (save-excursion
 371     (let ((posn (event-start event)))
 372       (set-buffer (window-buffer (posn-window posn)))
 373       (goto-char (posn-point posn))
 374       (let ((url (browse-url-url-at-point)))
 375         (if (string-equal url "")
 376             (error "No URL found"))
 377         (funcall browse-url-browser-function url)))))
 378
 379 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
 380 ;; Browse current buffer
 381
 382 (defun browse-url-of-file (&optional file)
 383   "Ask a WWW browser to display FILE.
 384 Display the current buffer's file if FILE is nil or if called
 385 interactively.  Turn the filename into a URL by performing
 386 replacements given in variable `browse-url-filename-alist'.  Pass the
 387 URL to a browser using variable `browse-url-browser-function' then run
 388 `browse-url-of-file-hook'."
 389   (interactive)
 390   (setq file
 391         (or file
 392             (buffer-file-name)
 393             (error "Current buffer has no file")))
 394   (let ((buf (get-file-buffer file)))
 395     (if buf
 396         (save-excursion
 397           (set-buffer buf)
 398           (cond ((not (buffer-modified-p)))
 399                 (browse-url-save-file (save-buffer))
 400                 (t (message "%s modified since last save" file))))))
 401   (funcall browse-url-browser-function (browse-url-file-url file))
 402   (run-hooks 'browse-url-of-file-hook))
 403
 404 (defun browse-url-file-url (file)
 405   "Return the URL corresponding to FILE.
 406 Uses variable `browse-url-filename-alist' to map filenames to URLs."
 407   (let ((maps browse-url-filename-alist))
 408     (while maps
 409       (let* ((map (car maps))
 410              (from-re (car map))
 411              (to-string (cdr map)))
 412         (setq maps (cdr maps))
 413         (if (string-match from-re file)
 414             (setq file (concat (substring file 0 (match-beginning 0))
 415                                to-string
 416                                (substring file (match-end 0))))))))
 417   file)
 418
 419 (defvar browse-url-temp-file-name nil)
 420 (make-variable-buffer-local 'browse-url-temp-file-name)
 421
 422 (defvar browse-url-temp-file-list '())
 423
 424 (defun browse-url-of-buffer (&optional buffer)
 425   "Ask a WWW browser to display BUFFER.
 426 Display the current buffer if BUFFER is nil."
 427   (interactive)
 428   (save-excursion
 429     (set-buffer (or buffer (current-buffer)))
 430     (let ((file-name
 431            (or buffer-file-name
 432                (and (boundp 'dired-directory) dired-directory))))
 433       (if (null file-name)
 434           (progn
 435             (if (null browse-url-temp-file-name)
 436                 (progn
 437                   (setq browse-url-temp-file-name
 438                         (make-temp-name
 439                          (expand-file-name (buffer-name)
 440                                            (or (getenv "TMPDIR") "/tmp"))))
 441                   (setq browse-url-temp-file-list
 442                         (cons browse-url-temp-file-name
 443                               browse-url-temp-file-list))))
 444             (write-region (point-min) (point-max) browse-url-temp-file-name
 445                           nil 'no-message)))
 446       (browse-url-of-file (or file-name browse-url-temp-file-name)))))
 447
 448 (defun browse-url-delete-temp-file (&optional temp-file-name)
 449   ;; Delete browse-url-temp-file-name from the file system and from
 450   ;; browse-url-temp-file-list.  If optional arg TEMP-FILE-NAME is
 451   ;; non-nil, delete it instead, but only from the file system --
 452   ;; browse-url-temp-file-list is not affected.
 453   (let ((file-name (or temp-file-name browse-url-temp-file-name)))
 454     (if (and file-name (file-exists-p file-name))
 455         (progn
 456           (delete-file file-name)
 457           (if (null temp-file-name)
 458               (setq browse-url-temp-file-list
 459                     (delete browse-url-temp-file-name
 460                             browse-url-temp-file-list)))))))
 461
 462 (defun browse-url-delete-temp-file-list ()
 463   ;; Delete all elements of browse-url-temp-file-list.
 464   (while browse-url-temp-file-list
 465     (browse-url-delete-temp-file (car browse-url-temp-file-list))
 466     (setq browse-url-temp-file-list
 467           (cdr browse-url-temp-file-list))))
 468
 469 (add-hook 'kill-buffer-hook 'browse-url-delete-temp-file)
 470 (add-hook 'kill-emacs-hook 'browse-url-delete-temp-file-list)
 471
 472 (defun browse-url-of-dired-file ()
 473   "In Dired, ask a WWW browser to display the file named on this line."
 474   (interactive)
 475   (browse-url-of-file (dired-get-filename)))
 476
 477 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
 478 ;; Browser-specific functions
 479
 480 (defun browse-url-netscape (url &optional new-window)
 481   "Ask the Netscape WWW browser to load URL.
 482
 483 Default to the URL around or before point.  The strings in variable
 484 `browse-url-netscape-arguments' are also passed to Netscape.
 485
 486 When called interactively, if variable `browse-url-new-window-p' is
 487 non-nil, load the document in a new Netscape window, otherwise use a
 488 random existing one.  A non-nil interactive prefix argument reverses
 489 the effect of browse-url-new-window-p.
 490
 491 When called non-interactively, optional second argument NEW-WINDOW is
 492 used instead of browse-url-new-window-p."
 493
 494   (interactive (append (browse-url-interactive-arg "Netscape URL: ")
 495                        (list (not (eq (null browse-url-new-window-p)
 496                                       (null current-prefix-arg))))))
 497   (or (zerop
 498        (apply 'call-process "netscape" nil nil nil
 499               (append browse-url-netscape-arguments
 500                       (if new-window '("-noraise"))
 501                       (list "-remote"
 502                             (concat "openURL(" url
 503                                     (if new-window ",new-window")
 504                                     ")")))))
 505       (progn                            ; Netscape not running - start it
 506         (message "Starting Netscape...")
 507         (apply 'start-process "netscape" nil "netscape"
 508                (append browse-url-netscape-arguments (list url))))))
 509
 510 (defun browse-url-netscape-reload ()
 511   "Ask Netscape to reload its current document."
 512   (interactive)
 513   (browse-url-netscape-command "reload"))
 514
 515 (defun browse-url-netscape-command (command)
 516   "Send a remote control command to Netscape."
 517   (apply 'start-process "netscape" nil "netscape"
 518          (append browse-url-netscape-arguments
 519                  (list "-remote" command))))
 520
 521 (defun browse-url-mosaic (url)
 522   "Ask the XMosaic WWW browser to load URL.
 523 Default to the URL around or before point."
 524   (interactive (browse-url-interactive-arg "Mosaic URL: "))
 525   (let ((pidfile (expand-file-name "~/.mosaicpid"))
 526         pid pidbuf)
 527     (if (file-readable-p pidfile)
 528         (save-excursion
 529           (find-file pidfile)
 530           (goto-char (point-min))
 531           (setq pid (read (current-buffer)))
 532           (kill-buffer nil)))
 533     (if (and pid (zerop (signal-process pid 0))) ; Mosaic running
 534         (save-excursion
 535           (find-file (format "/tmp/Mosaic.%d" pid))
 536           (erase-buffer)
 537           (insert "goto\n" url "\n")
 538           (save-buffer)
 539           (kill-buffer nil)
 540           ;; Send signal SIGUSR to Mosaic
 541           (message "Signalling Mosaic...")
 542           (signal-process pid browse-url-usr1-signal)
 543           ;; Or you could try:
 544           ;; (call-process "kill" nil 0 nil "-USR1" (int-to-string pid))
 545           )
 546       ;; Mosaic not running - start it
 547       (message "Starting Mosaic...")
 548       (apply 'start-process "xmosaic" nil "xmosaic"
 549              (append browse-url-mosaic-arguments (list url))))))
 550
 551 (defun browse-url-cci (url &optional new-window)
 552   "Ask the XMosaic WWW browser to load URL.
 553 Default to the URL around or before point.
 554
 555 This function only works for XMosaic version 2.5 or later.  You must
 556 select `CCI' from XMosaic's File menu, set the CCI Port Address to the
 557 value of variable `browse-url-CCI-port', and enable `Accept requests'.
 558
 559 When called interactively, if variable `browse-url-new-window-p' is
 560 non-nil, load the document in a new browser window, otherwise use a
 561 random existing one.  A non-nil interactive prefix argument reverses
 562 the effect of browse-url-new-window-p.
 563
 564 When called non-interactively, optional second argument NEW-WINDOW is
 565 used instead of browse-url-new-window-p."
 566   (interactive (append (browse-url-interactive-arg "Mosaic URL: ")
 567                        (list (not (eq (null browse-url-new-window-p)
 568                                       (null current-prefix-arg))))))
 569   (open-network-stream "browse-url" " *browse-url*"
 570                        "localhost" browse-url-CCI-port)
 571   ;; Todo: start browser if fails
 572   (process-send-string "browse-url"
 573                        (concat "get url (" url ") output "
 574                                (if new-window "new" "current") "\r\n"))
 575   (process-send-string "browse-url" "disconnect\r\n")
 576   (delete-process "browse-url"))
 577
 578 (defun browse-url-iximosaic (url)
 579   "Ask the IXIMosaic WWW browser to load URL.
 580 Default to the URL around or before point."
 581   (interactive (browse-url-interactive-arg "IXI Mosaic URL: "))
 582   (start-process "tellw3b" nil "tellw3b"
 583                  "-service WWW_BROWSER ixi_showurl " url))
 584
 585 (defun browse-url-w3 (url)
 586   "Ask the w3 WWW browser to load URL.
 587 Default to the URL around or before point."
 588   (interactive (browse-url-interactive-arg "W3 URL: "))
 589   (w3-fetch url))
 590
 591 (provide 'browse-url)
 592
 593 ;;; browse-url.el ends here