Erlang parse transform to add '-vsn' attributes from (e.g.) git

Add it to your rebar.config file, as follows:

{deps, [
    {vsn_transform, ".*",
        {git, "git://github.com/electricimp/vsn_transform.git"}}
]}.

{erl_opts, [
    {parse_transform, vsn_transform},
    {vsn_command, "git describe --tags"}
]}

Obviously, you can change the command as needed. You might want to use git rev-parse --short HEAD, for example.

At Electric Imp, we use a custom script that generates version strings that look like "138d21b - release-30.22 - Fri Oct 17 12:15:01 2014".

We specify it as follows:

    {vsn_command, "$BASE_DIR/git-vsn --friendly"}

...where BASE_DIR is an environment variable set in the top-level Makefile.

You can check it with the following:

lists:map(
    fun({Mod, Path}) ->
        Vsn = proplists:get_value(vsn, Mod:module_info(attributes)),
        {Mod, Vsn} 
    end, code:all_loaded()).

Apache 2.0