add rebar_hooks module

src/rebar_hooks.erl

@@ -0,0 +1,24 @@
+-module(rebar_hooks).
+
+-export([run_compile_hooks/4]).
+
+run_compile_hooks(Dir, Type, Command, State) ->
+    Hooks = rebar_state:get(State, Type, []),
+    lists:foreach(fun({_, C, _}=Hook) when C =:= Command ->
+                          apply_hook(Dir, [], Hook);
+                     ({C, _}=Hook) when C =:= Command ->
+                          apply_hook(Dir, [], Hook);
+                     (_) ->
+                          continue
+                  end, Hooks).
+
+apply_hook(Dir, Env, {Arch, Command, Hook}) ->
+    case rebar_utils:is_arch(Arch) of
+        true ->
+            apply_hook(Dir, Env, {Command, Hook});
+        false ->
+            ok
+    end;
+apply_hook(Dir, Env, {Command, Hook}) ->
+    Msg = lists:flatten(io_lib:format("Hook for ~p failed!~n", [Command])),
+    rebar_utils:sh(Hook, [{cd, Dir}, {env, Env}, {abort_on_error, Msg}]).