rebar3/priv/templates/simplesup.template

{variables, [{appid, "myapp"}
            ,{supid, "my"}
            ,{copyright_year, "2014"}
            ,{copyright_holder, "Geoff Cant"}
            ,{author_name, "Geoff Cant"}
            ,{author_email, "nem@erlang.geek.nz"}
            ]}.
{template, "simplesup.erl", "src/{{appid}}_{{supid}}_sup.erl"}.