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% Copyright (C) 2024 Eric Ludlam (and others)
% 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 3 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 General Public License
% along with this program. If not, see <http://www.gnu.org/licenses/>.
function nso = emacsnetshell(cmd, data)
% Create a connection to an EMACS editor server.
%
% emacsnetshell('init') - Initialize the connection with Emacs.
% emacs will send commands to MATLAB with additional connectivity
% information.
%
% emacsnetshell('ack') - Send ack to Emacs, it should echo back.
%
% emacsnetshell('output',data) - Send DATA as output to display in Emacs.
% emacsnetshell('error',data) - Send DATA as error description to Emacs.
% emacsnetshell('eval',data) - Send DATA - a string containing an Emacs
% lisp form which will be evaluated in Emacs.
EMACSSERVER = getappdata(groot, 'EmacsNetShell');
if nargin == 0
if isempty(EMACSSERVER)
cmd = 'init';
else
cmd = 'fetch';
end
end
if strcmp(cmd, 'fetch')
% Fetch means to get the server and return it. Do not create
% the server on fetch - otherwise no way to know if a server was started
% or not.
nso = EMACSSERVER;
return;
elseif strcmp(cmd, 'shutdown')
% Shutdown our connection to emacs.
setappdata(groot, 'EmacsNetShell', []);
if ~isempty(EMACSSERVER)
delete(EMACSSERVER);
end
else
if ~isempty(EMACSSERVER) && ~isvalid(EMACSSERVER)
EMACSSERVER = [];
setappdata(groot, 'EmacsNetShell', EMACSSERVER);
end
if isempty(EMACSSERVER)
EMACSSERVER = emacs.EmacsServer();
setappdata(groot, 'EmacsNetShell', EMACSSERVER);
sendinit = false;
else
sendinit = true;
end
if ~ischar(cmd)
error('Command must be a char vector.');
end
if ~strcmp(cmd,'init') || sendinit
if nargin == 2
EMACSSERVER.SendCommand(cmd, data);
else
EMACSSERVER.SendCommand(cmd);
end
end
end
if nargout == 1
nso = EMACSSERVER;
end
end
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