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## Copyright (C) 2018 John Donoghue <john.donoghue@ieee.org>
##
## 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
## <https://www.gnu.org/licenses/>.
## -*- texinfo -*-
## @deftypefn {} {@var{retval} =} addon (@var{ar}, @var{addonname})
## @deftypefnx {} {@var{retval} =} addon (@var{ar}, @var{addonname}, varargs)
## Create an addon object using the addon named class.
##
## @subsubheading Inputs
## @var{ar} - connected arduino object
##
## @var{addonname} - the name of the addon to create. The addon name can be a user
## addon or an inbuilt addon, however must appear in the listArduinoLibraries
## output and have been programmed onto the arduino.
##
## @var{varargs} - optional values that will be provided verbatim to the
## the addon class constructor.
##
## @subsubheading Outputs
## @var{retval} - cell array of string library names.
##
## @seealso{arduino, arduinosetup, listArduinoLibraries}
## @end deftypefn
function retval = addon (ar, addonname, varargin)
if (! isa (ar, "arduino"))
error("addon: expected first arguiment to be a arduino object");
endif
# verify arduino has the plugin name
p = ar.get_lib (addonname);
if p == -1
error ("addon: arduino has not been programmed with a plugin named '%s'\n", addonname);
endif
availlibs = listArduinoLibraries ();
addonlibs = __addons__ ();
# get addonin for the requested library
idx = find (cellfun(@(x) strcmpi(x.libraryname, addonname), addonlibs), 1);
if isempty (idx)
#if not found, was an inbuilt one ?
# verify can find the lib and get/make constructor of it
idx = find (cellfun(@(x) strcmpi(x, addonname), availlibs), 1);
if isempty (idx)
error ("addon: unknown library '%s'", addonname);
endif
# a known normal addon like spi
if strcmpi (addonname, "spi")
lib = "spidev";
elseif strcmpi (addonname, "i2c")
lib = "i2cdev";
elseif strcmpi (addonname, "servo")
lib = "servo";
elseif strcmpi (addonname, "shiftregister")
lib = "shiftRegister";
elseif strcmpi (addonname, "rotaryencoder")
lib = "rotaryEncoder";
else
error ("addon: unknown builtin library '%s'", addonname);
endif
else
# user addon constructor
lib = addonlibs{idx}.classname;
endif
# get constructor function handle
constructor = str2func (lib);
# create object
retval = constructor (ar, varargin{:});
endfunction
%!test
%! a = arduino();
%! # do equivalent of s = i2cdev(a, 10);
%! s = addon(a, "i2c", 10);
%! assert(class(s), "i2cdev");
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