jiffy/rebar.config.script

% This file is part of Jiffy released under the MIT license.
% See the LICENSE file for more information.
%
% Only run the EQC checks when EQC is present.

HaveEQC = code:which(eqc) =/= non_existing,

ErlOpts = if not HaveEQC -> []; true ->
    [{d, 'HAVE_EQC'}]
end,

case lists:keyfind(erl_opts, 1, CONFIG) of
    {erl_opts, Opts} ->
        NewOpts = {erl_opts, Opts ++ ErlOpts},
        lists:keyreplace(erl_opts, 1, CONFIG, NewOpts);
    false ->
        CONFIG ++ [{erl_opts, ErlOpts}]
end.