add bare compile provider, for starters for use by mix

src/rebar.app.src

@@ -36,6 +36,7 @@
 
         {providers, [rebar_prv_app_discovery,
                      rebar_prv_as,
+                     rebar_prv_bare_compile,
                      rebar_prv_clean,
                      rebar_prv_common_test,
                      rebar_prv_compile,

src/rebar_prv_bare_compile.erl

@@ -0,0 +1,42 @@
+-module(rebar_prv_bare_compile).
+
+-behaviour(provider).
+
+-export([init/1,
+         do/1,
+         format_error/1]).
+
+-include_lib("providers/include/providers.hrl").
+-include("rebar.hrl").
+
+-define(PROVIDER, compile).
+-define(NAMESPACE, bare).
+-define(DEPS, [{default, app_discovery}]).
+
+%% ===================================================================
+%% Public API
+%% ===================================================================
+
+-spec init(rebar_state:t()) -> {ok, rebar_state:t()}.
+init(State) ->
+    State1 = rebar_state:add_provider(State, providers:create([{name, ?PROVIDER},
+                                                               {module, ?MODULE},
+                                                               {namespace, ?NAMESPACE},
+                                                               {bare, false},
+                                                               {deps, ?DEPS},
+                                                               {example, ""},
+                                                               {short_desc, ""},
+                                                               {desc, ""},
+                                                               {opts, []}])),
+    {ok, State1}.
+
+-spec do(rebar_state:t()) -> {ok, rebar_state:t()} | {error, string()}.
+do(State) ->
+    [AppInfo] = rebar_state:project_apps(State),
+    AppInfo1 = rebar_app_info:out_dir(AppInfo, rebar_dir:get_cwd()),
+    rebar_prv_compile:compile(State, AppInfo1),
+    {ok, State}.
+
+-spec format_error(any()) -> iolist().
+format_error(Reason) ->
+    io_lib:format("~p", [Reason]).