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/* Part of XPCE --- The SWI-Prolog GUI toolkit
Author: Jan Wielemaker and Anjo Anjewierden
E-mail: J.Wielemaker@cs.vu.nl
WWW: http://www.swi-prolog.org/packages/xpce/
Copyright (c) 2006-2020, University of Amsterdam
VU University Amsterdam
All rights reserved.
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions
are met:
1. Redistributions of source code must retain the above copyright
notice, this list of conditions and the following disclaimer.
2. Redistributions in binary form must reproduce the above copyright
notice, this list of conditions and the following disclaimer in
the documentation and/or other materials provided with the
distribution.
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
POSSIBILITY OF SUCH DAMAGE.
*/
:- module(emacs_dde_server,
[ start_emacs_dde_server/1, % +Force
win_register_emacs/0 % +Externsion
]).
:- use_module(library(pce)).
:- require([debug/3]).
/** <module> Register PceEmacs with the Windows DDE services
This module registers the DDE service =PceEmacs= that allows accessing
PceEmacs from the Windows shell. The access points are dummy calls if
DDE is nor provided.
*/
%! start_emacs_dde_server(+Force) is det.
%
% If there is no DDE server, register it as =PceEmacs= using the
% topic =control=.
:- if(current_predicate(open_dde_conversation/3)).
:- use_module(library(dde)).
start_emacs_dde_server(_) :-
dde_current_service('PceEmacs', control),
debug(emacs(server), 'PceEmacs DDE server is already running', []),
!.
start_emacs_dde_server(true) :-
catch(close_other_dde_server, _, fail),
fail.
start_emacs_dde_server(false) :-
get_time(T0),
( catch(ping_other_dde_server, _, fail)
-> Alive = alive
; Alive = dead
),
!,
get_time(T1),
_0T is T1-T0,
debug(emacs(server), 'Remote DDE server is ~w (~3f sec)', [Alive, _0T]),
Alive == alive,
ignore(send(@emacs, report, status, 'Server on other PceEmacs')).
start_emacs_dde_server(_) :-
dde_register_service('PceEmacs'(control, Item),
handle_request(Item)).
close_other_dde_server :-
setup_call_cleanup(open_dde_conversation('PceEmacs', control, Handle),
dde_execute(Handle, 'close-server'),
close_dde_conversation(Handle)),
send(@emacs, report, status, 'Closed server on other PceEmacs').
ping_other_dde_server :-
open_dde_conversation('PceEmacs', control, Handle),
!,
close_dde_conversation(Handle).
handle_request(Item) :-
atom_concat('edit ', WinFile, Item),
!,
prolog_to_os_filename(File, WinFile),
new(B, emacs_buffer(File)),
send(B, open, tab),
send(B, check_modified_file).
handle_request('close-server') :-
dde_unregister_service('PceEmacs'),
send(@emacs, report, status, 'Closed DDE server').
handle_request(Item) :-
format(user_error, 'PceEmacs DDE server: unknown request: ~q', [Item]),
fail.
:- else.
start_emacs_dde_server(_).
:- endif.
:- if(current_predicate(shell_register_dde/6)).
win_register_emacs :-
current_prolog_flag(executable, Me),
shell_register_dde('prolog.type', edit,
'PceEmacs', control, 'edit %1', Me).
:- else.
win_register_emacs.
:- endif.
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