emqx4.3/apps/emqx_plugin_template/src/emqx_plugin_template.app.src.script

%%-*- mode: erlang -*-
%% .app.src.script

RemoveLeadingV =
    fun(Tag) ->
        case re:run(Tag, "^[v|e]?[0-9]\.[0-9]\.([0-9]|(rc|beta|alpha)\.[0-9])", [{capture, none}]) of
            nomatch ->
                re:replace(Tag, "/", "-", [{return ,list}]);
            _ ->
                %% if it is a version number prefixed by 'v' or 'e', then remove it
                re:replace(Tag, "[v|e]", "", [{return ,list}])
        end
    end,

case os:getenv("EMQX_DEPS_DEFAULT_VSN") of
    false -> CONFIG; % env var not defined
    []    -> CONFIG; % env var set to empty string
    Tag ->
       [begin
           AppConf0 = lists:keystore(vsn, 1, AppConf, {vsn, RemoveLeadingV(Tag)}),
           {application, App, AppConf0}
        end || Conf = {application, App, AppConf} <- CONFIG]
end.