rebar.config.script

%% -*- erlang -*-
%%
%% Copyright (C) 2022-2025  Mikael Pettersson
%%
%% Licensed under the Apache License, Version 2.0 (the "License");
%% you may not use this file except in compliance with the License.
%% You may obtain a copy of the License at
%%
%%     http://www.apache.org/licenses/LICENSE-2.0
%%
%% Unless required by applicable law or agreed to in writing, software
%% distributed under the License is distributed on an "AS IS" BASIS,
%% WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
%% See the License for the specific language governing permissions and
%% limitations under the License.

case os:cmd("git describe --dirty") of
  "fatal: " ++ _ ->
    CONFIG;
  Output ->
    VSN = string:trim(Output),
    Opts =
      case lists:keyfind(erl_opts, 1, CONFIG) of
        false -> [];
        {erl_opts, Opts0} ->
          lists:filter(fun({d, 'VSN', _}) -> false; (_) -> true end, Opts0)
      end,
    NewOpts = [{d, 'VSN', VSN} | Opts],
    lists:keystore(erl_opts, 1, CONFIG, {erl_opts, NewOpts})
  end.