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yap-6.3/swi/library/www_browser.pl

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2011-06-13 01:57:15 +01:00
/* $Id$
Part of SWI-Prolog
Author: Jan Wielemaker
E-mail: J.Wielemaker@cs.vu.nl
WWW: http://www.swi-prolog.org
Copyright (C): 1985-2011, University of Amsterdam
VU University Amsterdam
This program 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
of the License, or (at your option) any later version.
This program 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 Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
As a special exception, if you link this library with other files,
compiled with a Free Software compiler, to produce an executable, this
library does not by itself cause the resulting executable to be covered
by the GNU General Public License. This exception does not however
invalidate any other reasons why the executable file might be covered by
the GNU General Public License.
*/
:- module(www_browser,
[ www_open_url/1, % +UrlOrSpec
expand_url_path/2 % +Spec, -URL
]).
:- use_module(library(lists)).
:- use_module(library(readutil)).
:- multifile
known_browser/2.
%% www_open_url(+Url)
%
% Open URL in running version of the users' browser or start a new
% browser. This predicate tries the following steps:
%
% 1. If a prolog flag (see set_prolog_flag/2) =browser= is set
% or the environment =BROWSER= and this is the name of a known
% executable, use this. This uses www_open_url/2.
%
% 2. On Windows, use win_shell(open, URL)
%
% 3. Find a generic `open' comment. Candidates are =open=,
% =|gnome-open|=, =kfmclient=.
%
% 4. Try to find a known browser.
%
% @tbd Figure out the right tool in step 3 as it is not
% uncommon that multiple are installed.
www_open_url(Spec) :- % user configured
( current_prolog_flag(browser, Browser)
; getenv('BROWSER', Browser)
),
has_command(Browser), !,
expand_url_path(Spec, URL),
www_open_url(Browser, URL).
:- if(current_predicate(win_shell/2)).
www_open_url(Spec) :- % Windows shell
expand_url_path(Spec, URL),
win_shell(open, URL).
:- endif.
www_open_url(Spec) :- % Unix `open document'
open_command(Open),
has_command(Open), !,
expand_url_path(Spec, URL),
format(string(Cmd), '~w "~w"', [Open, URL]),
shell(Cmd).
www_open_url(Spec) :- % KDE client
has_command(kfmclient), !,
expand_url_path(Spec, URL),
format(string(Cmd), 'kfmclient openURL "~w"', [URL]),
shell(Cmd).
www_open_url(Spec) :- % something we know
known_browser(Browser, _),
has_command(Browser), !,
expand_url_path(Spec, URL),
www_open_url(Browser, URL).
open_command('gnome-open').
open_command(open).
%% www_open_url(+Browser, +URL) is det.
%
% Open a page using a browser. Preferably we use an existing
% browser to to the job. Currently only supports browsers with a
% netscape compatible remote interface.
%
% @see http://www.mozilla.org/unix/remote.html
www_open_url(Browser, URL) :-
compatible(Browser, netscape),
netscape_remote(Browser, 'ping()', []), !,
netscape_remote(Browser, 'openURL(~w,new-window)', [URL]).
www_open_url(Browser, URL) :-
format(string(Cmd), '"~w" "~w" &', [Browser, URL]),
shell(Cmd).
%% netscape_remote(+Browser, +Format, +Args) is semidet.
%
% Execute netscape remote command using =|-remote|=. Create the
% remote command using format/3 from Format and Args.
%
% @bug At least firefox gives always 0 exit code on -remote,
% so we must check the error message. Grrrr.
netscape_remote(Browser, Fmt, Args) :-
format(string(RCmd), Fmt, Args),
format(string(Cmd), '"~w" -remote "~w" 2>&1', [Browser, RCmd]),
open(pipe(Cmd), read, In),
call_cleanup(read_stream_to_codes(In, Codes),
close(In)),
( append("Error:", _, Codes)
-> !, fail
; true
).
compatible(Browser, With) :-
file_base_name(Browser, Base),
known_browser(Base, With).
%% known_browser(+FileBaseName, -Compatible)
%
% True if browser FileBaseName has a remote protocol compatible to
% Compatible.
known_browser(firefox, netscape).
known_browser(mozilla, netscape).
known_browser(netscape, netscape).
known_browser(konqueror, -).
known_browser(opera, -).
%% has_command(+Command)
%
% Succeeds if Command is in $PATH. Works for Unix systems. For
% Windows we have to test for executable extensions.
:- dynamic
command_cache/2.
:- volatile
command_cache/2.
has_command(Command) :-
command_cache(Command, Path), !,
Path \== (-).
has_command(Command) :-
( getenv('PATH', Path),
( current_prolog_flag(windows, true)
-> Sep = (;)
; Sep = (:)
),
atomic_list_concat(Parts, Sep, Path),
member(Part, Parts),
prolog_to_os_filename(PlPart, Part),
atomic_list_concat([PlPart, Command], /, Exe),
access_file(Exe, execute)
-> assert(command_cache(Command, Exe))
; assert(command_cache(Command, -)),
fail
).
/*******************************
* NET PATHS *
*******************************/
%% url_path(+Alias, -Expansion) is nondet.
%
% Define URL path aliases. This multifile predicate is defined in
% module =user=. Expansion is either a URL, or a term Alias(Sub).
:- multifile
user:url_path/2.
user:url_path(swipl, 'http://www.swi-prolog.org').
user:url_path(swipl_faq, swipl('FAQ')).
user:url_path(swipl_man, swipl('pldoc/index.html')).
user:url_path(swipl_mail, swipl('Mailinglist.html')).
user:url_path(swipl_download, swipl('Download.html')).
user:url_path(swipl_bugs, swipl('bugzilla')).
user:url_path(swipl_quick, swipl('man/quickstart.html')).
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user:url_path(yap, 'http://www.dcc.fc.up.pt/~vsc/Yap').
user:url_path(yap_download, 'http://www.dcc.fc.up.pt/~vsc/Yap/downloads.html').
user:url_path(yap_man, yap('documentation.html')).
user:url_path(yap_bugs, 'http://sourceforge.net/tracker/?group_id=24437&atid=381483').
user:url_path(yap_git, 'http://yap.git.sourceforge.net/git/gitweb-index.cgi').
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%% expand_url_path(+Spec, -URL)
%
% Expand URL specifications similar to absolute_file_name/3. The
% predicate url_path/2 plays the role of file_search_path/2.
expand_url_path(URL, URL) :-
atomic(URL), !. % Allow atom and string
expand_url_path(Spec, URL) :-
Spec =.. [Path, Local],
( user:url_path(Path, Spec2)
-> expand_url_path(Spec2, URL0),
( Local == '.'
-> URL = URL0
; sub_atom(Local, 0, _, _, #)
-> atom_concat(URL0, Local, URL)
; atomic_list_concat([URL0, Local], /, URL)
)
; throw(error(existence_error(url_path, Path), expand_url_path/2))
).