rebar.config.script

Patch = fun (Key, Value, Config) ->
                case lists:keysearch(Key, 1, Config) of
                    {value, {_, Org}} ->
                        lists:keyreplace(Key, 1, Config, {Key, Org ++ Value});
                    false ->
                        [{Key, Value}|Config]
                end
        end,

application:load(syntax_tools),
NewCfg = case application:get_key(syntax_tools, vsn) of
    {ok, Vsn} when "1.7" > Vsn ->
        Deps = [{merl, ".*", {git, "https://github.com/Licenser/merl.git", {branch, "master"}}},
                {erlydtl, "",
                         {git, "https://github.com/erlydtl/erlydtl.git",
                          {branch, "master"}}}],

        Overrides =
          [{override, erlydtl,
           [{pre_hooks,
            [{"(linux|darwin|solaris)", compile, "make -C \"$REBAR_DEPS_DIR/merl\" all -W test"},
             {"(freebsd|netbsd|openbsd)", compile, "gmake -C \"$REBAR_DEPS_DIR/merl\" all"},
             {"win32", compile, "make -C \"%REBAR_PLUGINS_DIR%/merl\" all -W test"},
             {eunit,
              "erlc -I include/erlydtl_preparser.hrl -o test"
              " test/erlydtl_extension_testparser.yrl"},
             {"(linux|darwin|solaris)", eunit, "make -C \"$REBAR_PLUGINS_DIR/merl\" test"},
             {"(freebsd|netbsd|openbsd)", eunit, "gmake -C \"$REBAR_PLUGINS_DIR/merl\" test"},
             {"win32", eunit, "make -C \"%REBAR_PLUGINS_DIR%/merl\" test"}
            ]}]}
          ],

        [{deps, Deps},
         {overrides, Overrides},
         {erl_opts, [{d, 'MERL_DEP'}]}];
    _ ->
        [{deps, [{erlydtl, "",
                        {git, "https://github.com/erlydtl/erlydtl.git",
                         {branch, "master"}}}]}]
end,

lists:foldl(
  fun ({K, V}, C) -> Patch(K, V, C) end,
  CONFIG, NewCfg).