refactoring and remove unused providers for now

18 files changed, 303 insertions, 809 deletions

diff --git a/ebin/rebar.app b/ebin/rebar.app
index 0c02a8e..47770cc 100644
--- a/ebin/rebar.app
+++ b/ebin/rebar.app
@@ -28,18 +28,15 @@
               rebar_provider,
               rebar_prv_app_builder,
               rebar_prv_app_discovery,
-              rebar_qc,
               rebar_require_vsn,
               rebar_prv_release,
               rebar_prv_update,
               rebar_shell,
               rebar_state,
-              rebar_subdirs,
               rebar_prv_tar,
               rebar_templater,
               rebar_topo,
               rebar_utils,
-              rebar_xref,
               rebar_getopt]},
   {registered, []},
   {applications, [kernel,
@@ -50,7 +47,8 @@
                   syntax_tools,
                   tools,
                   erlware_commons,
-                  relx]},
+                  relx,
+                  inets]},
   {env, [
         %% Default log level
         {log_level, warn},
@@ -62,6 +60,7 @@
                      rebar_prv_app_builder,
                      rebar_prv_app_discovery,
                      rebar_shell,
+                     rebar_ct,
                      rebar_prv_tar,
                      rebar_prv_update,
                      rebar_prv_release]}
diff --git a/include/rebar.hrl b/include/rebar.hrl
index bc74b59..1b83a9b 100644
--- a/include/rebar.hrl
+++ b/include/rebar.hrl
@@ -15,7 +15,6 @@
 
 -record(provider,  {name :: atom(),            % The 'user friendly' name of the task
                     provider_impl :: atom(),   % The implementation of the task, maybe fun or
-                    provides :: atom(),
                     bare :: boolean(),         % Indicates whether a build config is needed
                     deps :: [atom()],          % The list of dependencies
                     desc :: string(),          % The description for the task
diff --git a/rebar.config b/rebar.config
index b959579..5e2aa09 100644
--- a/rebar.config
+++ b/rebar.config
@@ -5,7 +5,7 @@
 %% Do not use outside rebar. Config interface is not stable.
 {escript_incl_extra, [{"priv/templates/*", "."}]}.
 {escript_incl_apps,
- [getopt, erlydtl, erlware_commons, relx]}.
+ [inets, getopt, erlydtl, erlware_commons, relx]}.
 {escript_top_level_app, rebar}.
 
 %% Types dict:dict() and digraph:digraph() have been introduced in Erlang 17.
diff --git a/src/rebar.erl b/src/rebar.erl
index a7bbe1a..338e97b 100644
--- a/src/rebar.erl
+++ b/src/rebar.erl
@@ -162,7 +162,10 @@ run_aux(BaseConfig, Commands) ->
         ok -> ok;
         {error,{already_started,crypto}} -> ok
     end,
-
+    application:start(asn1),
+    application:start(public_key),
+    application:start(ssl),
+    inets:start(),
     [Command | Args] = Commands,
     CommandAtom = list_to_atom(Command),
 
diff --git a/src/rebar_app_discover.erl b/src/rebar_app_discover.erl
index d4c904d..aaaeb03 100644
--- a/src/rebar_app_discover.erl
+++ b/src/rebar_app_discover.erl
@@ -8,7 +8,7 @@
 do(State, LibDirs) ->
     Apps = find_apps(LibDirs, all),
     lists:foldl(fun(AppInfo, StateAcc) ->
-                        rebar_state:add_app(StateAcc, AppInfo)
+                        rebar_state:apps_to_build(StateAcc, AppInfo)
             end, State, Apps).
 
 -spec all_app_dirs(list(file:name())) -> list(file:name()).
@@ -35,10 +35,15 @@ app_dirs(LibDir) ->
                            "*.app"]),
 
     lists:usort(lists:foldl(fun(Path, Acc) ->
-                                    Files = filelib:wildcard(Path),
+                                    Files = filelib:wildcard(to_list(Path)),
                                     [app_dir(File) || File <- Files] ++ Acc
                             end, [], [Path1, Path2, Path3, Path4])).
 
+to_list(S) when is_list(S) ->
+    S;
+to_list(S) when is_binary(S) ->
+    binary_to_list(S).
+
 find_unbuilt_apps(LibDirs) ->
     find_apps(LibDirs, invalid).
 
@@ -115,13 +120,12 @@ create_app_info(AppDir, AppFile) ->
                          rebar_app_info:app_details(AppInfo, AppDetails), AppState1),
             rebar_app_info:dir(AppInfo1, AppDir)
     end.
+
 -spec validate_application_info(rebar_app_info:t()) -> boolean().
 validate_application_info(AppInfo) ->
     EbinDir = rebar_app_info:ebin_dir(AppInfo),
     AppFile = rebar_app_info:app_file(AppInfo),
-    AppName = rebar_app_info:app_details(AppInfo),
     AppDetail = rebar_app_info:app_details(AppInfo),
-    AppDir = filename:dirname(EbinDir),
     case get_modules_list(AppFile, AppDetail) of
         {ok, List} ->
             has_all_beams(EbinDir, List);
diff --git a/src/rebar_base_compiler.erl b/src/rebar_base_compiler.erl
index e4e4b79..0536c06 100644
--- a/src/rebar_base_compiler.erl
+++ b/src/rebar_base_compiler.erl
@@ -135,12 +135,12 @@ compile_each([], _Config, _CompileFn) ->
 compile_each([Source | Rest], Config, CompileFn) ->
     case compile(Source, Config, CompileFn) of
         ok ->
-            ?INFO("Compiled ~s\n", [Source]);
+            ?INFO("~sCompiled ~s\n", [rebar_utils:indent(1), Source]);
         {ok, Warnings} ->
             report(Warnings),
-            ?INFO("Compiled ~s\n", [Source]);
+            ?INFO("~sCompiled ~s\n", [rebar_utils:indent(1), Source]);
         skipped ->
-            ?DEBUG("Skipped ~s\n", [Source]);
+            ?DEBUG("~sSkipped ~s\n", [rebar_utils:indent(1), Source]);
         Error ->
             ?INFO("Compiling ~s failed:\n",
                      [maybe_absname(Config, Source)]),
@@ -165,7 +165,7 @@ compile_queue(Config, Pids, Targets) ->
             end;
 
         {fail, {_, {source, Source}}=Error} ->
-            ?CONSOLE("Compiling ~s failed:\n",
+            ?ERROR("Compiling ~s failed:\n",
                      [maybe_absname(Config, Source)]),
             maybe_report(Error),
             ?DEBUG("Worker compilation failed: ~p\n", [Error]),
@@ -173,17 +173,15 @@ compile_queue(Config, Pids, Targets) ->
 
         {compiled, Source, Warnings} ->
             report(Warnings),
-            ?INFO("Compiled ~s\n", [Source]),
+            ?INFO("~sCompiled ~s\n", [rebar_utils:indent(1), Source]),
             compile_queue(Config, Pids, Targets);
 
         {compiled, Source} ->
-            ?INFO("Compiled ~s\n", [Source]),
+            ?INFO("~sCompiled ~s\n", [rebar_utils:indent(1), Source]),
             compile_queue(Config, Pids, Targets);
-
         {skipped, Source} ->
-            ?DEBUG("Skipped ~s\n", [Source]),
+            ?DEBUG("~sSkipped ~s~n", [rebar_utils:indent(1), Source]),
             compile_queue(Config, Pids, Targets);
-
         {'DOWN', Mref, _, Pid, normal} ->
             ?DEBUG("Worker exited cleanly\n", []),
             Pids2 = lists:delete({Pid, Mref}, Pids),
diff --git a/src/rebar_core.erl b/src/rebar_core.erl
index a146cce..d4daff7 100644
--- a/src/rebar_core.erl
+++ b/src/rebar_core.erl
@@ -44,7 +44,8 @@ process_command(State, Command) ->
     TargetProviders = rebar_provider:get_target_providers(Command, State),
 
     lists:foldl(fun(TargetProvider, Conf) ->
-                        Provider = rebar_provider:get_provider(TargetProvider, rebar_state:providers(Conf)),
+                        Provider = rebar_provider:get_provider(TargetProvider
+                                                              ,rebar_state:providers(Conf)),
                         {ok, Conf1} = rebar_provider:do(Provider, Conf),
                         Conf1
                 end, State, TargetProviders).
diff --git a/src/rebar_ct.erl b/src/rebar_ct.erl
index 6bccb82..781f7da 100644
--- a/src/rebar_ct.erl
+++ b/src/rebar_ct.erl
@@ -37,21 +37,41 @@
 %% -------------------------------------------------------------------
 -module(rebar_ct).
 
--export([ct/2]).
+-behaviour(rebar_provider).
+
+-export([init/1,
+         do/1]).
 
 %% for internal use only
 -export([info/2]).
 
 -include("rebar.hrl").
 
+-define(PROVIDER, ct).
+-define(DEPS, [compile]).
+
 %% ===================================================================
 %% Public API
 %% ===================================================================
 
-ct(Config, File) ->
-    TestDir = rebar_config:get_local(Config, ct_dir, "test"),
-    LogDir = rebar_config:get_local(Config, ct_log_dir, "logs"),
-    run_test_if_present(TestDir, LogDir, Config, File).
+-spec init(rebar_state:t()) -> {ok, rebar_state:t()}.
+init(State) ->
+    State1 = rebar_state:add_provider(State, #provider{name = ?PROVIDER,
+                                                       provider_impl = ?MODULE,
+                                                       bare = false,
+                                                       deps = ?DEPS,
+                                                       example = "rebar ct",
+                                                       short_desc = "",
+                                                       desc = "",
+                                                       opts = []}),
+    {ok, State1}.
+
+-spec do(rebar_state:t()) -> {ok, rebar_state:t()}.
+do(State) ->
+    TestDir = rebar_state:get(State, ct_dir, "test"),
+    LogDir = rebar_state:get(State, ct_log_dir, "logs"),
+    run_test_if_present(TestDir, LogDir, State),
+    {ok, State}.
 
 %% ===================================================================
 %% Internal functions
@@ -76,7 +96,7 @@ info(help, ct) ->
         {ct_use_short_names, true}
        ]).
 
-run_test_if_present(TestDir, LogDir, Config, File) ->
+run_test_if_present(TestDir, LogDir, State) ->
     case filelib:is_dir(TestDir) of
         false ->
             ?WARN("~s directory not present - skipping\n", [TestDir]),
@@ -89,7 +109,7 @@ run_test_if_present(TestDir, LogDir, Config, File) ->
                     ok;
                 _ ->
                     try
-                        run_test(TestDir, LogDir, Config, File)
+                        run_test(TestDir, LogDir, State)
                     catch
                         throw:skip ->
                             ok
@@ -97,11 +117,11 @@ run_test_if_present(TestDir, LogDir, Config, File) ->
             end
     end.
 
-run_test(TestDir, LogDir, Config, _File) ->
-    {Cmd, RawLog} = make_cmd(TestDir, LogDir, Config),
+run_test(TestDir, LogDir, State) ->
+    {Cmd, RawLog} = make_cmd(TestDir, LogDir, State),
     ?DEBUG("ct_run cmd:~n~p~n", [Cmd]),
     clear_log(LogDir, RawLog),
-    Output = case rebar_log:is_verbose(Config) of
+    Output = case rebar_log:is_verbose(State) of
                  false ->
                      " >> " ++ RawLog ++ " 2>&1";
                  true ->
@@ -113,11 +133,11 @@ run_test(TestDir, LogDir, Config, _File) ->
         {ok,_} ->
             %% in older versions of ct_run, this could have been a failure
             %% that returned a non-0 code. Check for that!
-            check_success_log(Config, RawLog);
+            check_success_log(State, RawLog);
         {error,Res} ->
             %% In newer ct_run versions, this may be a sign of a good compile
             %% that failed cases. In older version, it's a worse error.
-            check_fail_log(Config, RawLog, Cmd ++ Output, Res)
+            check_fail_log(State, RawLog, Cmd ++ Output, Res)
     end.
 
 clear_log(LogDir, RawLog) ->
@@ -133,8 +153,8 @@ clear_log(LogDir, RawLog) ->
 
 %% calling ct with erl does not return non-zero on failure - have to check
 %% log results
-check_success_log(Config, RawLog) ->
-    check_log(Config, RawLog, fun(Msg) -> ?CONSOLE("DONE.\n~s\n", [Msg]) end).
+check_success_log(State, RawLog) ->
+    check_log(State, RawLog, fun(Msg) -> ?CONSOLE("DONE.\n~s\n", [Msg]) end).
 
 -type err_handler() :: fun((string()) -> no_return()).
 -spec failure_logger(string(), {integer(), string()}) -> err_handler().
@@ -144,10 +164,10 @@ failure_logger(Command, {Rc, Output}) ->
                    [Command, Rc, Output])
     end.
 
-check_fail_log(Config, RawLog, Command, Result) ->
-    check_log(Config, RawLog, failure_logger(Command, Result)).
+check_fail_log(State, RawLog, Command, Result) ->
+    check_log(State, RawLog, failure_logger(Command, Result)).
 
-check_log(Config,RawLog,Fun) ->
+check_log(State,RawLog,Fun) ->
     {ok, Msg} =
         rebar_utils:sh("grep -e \"TEST COMPLETE\" -e \"{error,make_failed}\" "
                        ++ RawLog, [{use_stdout, false}]),
@@ -155,12 +175,12 @@ check_log(Config,RawLog,Fun) ->
     RunFailed = string:str(Msg, ", 0 failed") =:= 0,
     if
         MakeFailed ->
-            show_log(Config, RawLog),
+            show_log(State, RawLog),
             ?ERROR("Building tests failed\n",[]),
             ?FAIL;
 
         RunFailed ->
-            show_log(Config, RawLog),
+            show_log(State, RawLog),
             ?ERROR("One or more tests failed\n",[]),
             ?FAIL;
 
@@ -170,9 +190,9 @@ check_log(Config,RawLog,Fun) ->
 
 
 %% Show the log if it hasn't already been shown because verbose was on
-show_log(Config, RawLog) ->
+show_log(State, RawLog) ->
     ?CONSOLE("Showing log\n", []),
-    case rebar_log:is_verbose(Config) of
+    case rebar_log:is_verbose(State) of
         false ->
             {ok, Contents} = file:read_file(RawLog),
             ?CONSOLE("~s", [Contents]);
@@ -180,10 +200,9 @@ show_log(Config, RawLog) ->
             ok
     end.
 
-make_cmd(TestDir, RawLogDir, Config) ->
+make_cmd(TestDir, RawLogDir, State) ->
     Cwd = rebar_utils:get_cwd(),
     LogDir = filename:join(Cwd, RawLogDir),
-    EbinDir = filename:absname(filename:join(Cwd, "ebin")),
     IncludeDir = filename:join(Cwd, "include"),
     Include = case filelib:is_dir(IncludeDir) of
                   true ->
@@ -205,12 +224,13 @@ make_cmd(TestDir, RawLogDir, Config) ->
     %% includes the dependencies in the code path. The directories
     %% that are part of the root Erlang install are filtered out to
     %% avoid duplication
-    R = code:root_dir(),
-    NonLibCodeDirs = [P || P <- code:get_path(), not lists:prefix(R, P)],
-    CodeDirs = [io_lib:format("\"~s\"", [Dir]) ||
-                   Dir <- [EbinDir|NonLibCodeDirs]],
+    Apps = rebar_state:apps_to_build(State),
+    DepsDir = rebar_deps:get_deps_dir(State),
+    DepsDirEbin = filename:join([DepsDir, "*", "ebin"]),
+    AppDirs = [filename:join(rebar_app_info:dir(A), "ebin") || A <- Apps],
+    CodeDirs = [io_lib:format("\"~s\"", [Dir]) || Dir <- [DepsDirEbin | AppDirs]],
     CodePathString = string:join(CodeDirs, " "),
-    Cmd = case get_ct_specs(Config, Cwd) of
+    Cmd = case get_ct_specs(State, Cwd) of
               undefined ->
                   ?FMT("~s"
                        " -pa ~s"
@@ -221,14 +241,14 @@ make_cmd(TestDir, RawLogDir, Config) ->
                        [BaseCmd,
                         CodePathString,
                         Include,
-                        build_name(Config),
+                        build_name(State),
                         LogDir,
                         filename:join(Cwd, TestDir)]) ++
-                      get_cover_config(Config, Cwd) ++
+                      get_cover_config(State, Cwd) ++
                       get_ct_config_file(TestDir) ++
                       get_config_file(TestDir) ++
-                      get_suites(Config, TestDir) ++
-                      get_case(Config);
+                      get_suites(State, TestDir) ++
+                      get_case(State);
               SpecFlags ->
                   ?FMT("~s"
                        " -pa ~s"
@@ -239,31 +259,32 @@ make_cmd(TestDir, RawLogDir, Config) ->
                        [BaseCmd,
                         CodePathString,
                         Include,
-                        build_name(Config),
+                        build_name(State),
                         LogDir,
                         filename:join(Cwd, TestDir)]) ++
-                      SpecFlags ++ get_cover_config(Config, Cwd)
+                      SpecFlags ++ get_cover_config(State, Cwd)
           end,
-    Cmd1 = Cmd ++ get_extra_params(Config),
+    io:format("Cmd ~s~n", [Cmd]),
+    Cmd1 = Cmd ++ get_extra_params(State),
     RawLog = filename:join(LogDir, "raw.log"),
     {Cmd1, RawLog}.
 
-build_name(Config) ->
-    case rebar_config:get_local(Config, ct_use_short_names, false) of
+build_name(State) ->
+    case rebar_state:get(State, ct_use_short_names, false) of
         true -> "-sname test";
         false -> " -name test@" ++ net_adm:localhost()
     end.
 
-get_extra_params(Config) ->
-    case rebar_config:get_local(Config, ct_extra_params, undefined) of
+get_extra_params(State) ->
+    case rebar_state:get(State, ct_extra_params, undefined) of
         undefined ->
             "";
         Defined ->
             " " ++ Defined
     end.
 
-get_ct_specs(Config, Cwd) ->
-    case collect_glob(Config, Cwd, ".*\.test\.spec\$") of
+get_ct_specs(State, Cwd) ->
+    case collect_glob(State, Cwd, ".*\.test\.spec\$") of
         [] -> undefined;
         [Spec] ->
             " -spec " ++ Spec;
@@ -272,12 +293,12 @@ get_ct_specs(Config, Cwd) ->
                 lists:flatten([io_lib:format("~s ", [Spec]) || Spec <- Specs])
     end.
 
-get_cover_config(Config, Cwd) ->
-    case rebar_config:get_local(Config, cover_enabled, false) of
+get_cover_config(State, Cwd) ->
+    case rebar_state:get(State, cover_enabled, false) of
         false ->
             "";
         true ->
-            case collect_glob(Config, Cwd, ".*cover\.spec\$") of
+            case collect_glob(State, Cwd, ".*cover\.spec\$") of
                 [] ->
                     ?DEBUG("No cover spec found: ~s~n", [Cwd]),
                     "";
@@ -289,15 +310,15 @@ get_cover_config(Config, Cwd) ->
             end
     end.
 
-collect_glob(Config, Cwd, Glob) ->
-    {true, Deps} = rebar_deps:get_deps_dir(Config),
+collect_glob(State, Cwd, Glob) ->
+    DepsDir = rebar_deps:get_deps_dir(State),
     CwdParts = filename:split(Cwd),
     filelib:fold_files(Cwd, Glob, true, fun(F, Acc) ->
         %% Ignore any specs under the deps/ directory. Do this pulling
         %% the dirname off the F and then splitting it into a list.
         Parts = filename:split(filename:dirname(F)),
         Parts2 = remove_common_prefix(Parts, CwdParts),
-        case lists:member(Deps, Parts2) of
+        case lists:member(DepsDir, Parts2) of
             true ->
                 Acc;                % There is a directory named "deps" in path
             false ->
@@ -311,25 +332,25 @@ remove_common_prefix(L1, _) ->
     L1.
 
 get_ct_config_file(TestDir) ->
-    Config = filename:join(TestDir, "test.config"),
-    case filelib:is_regular(Config) of
+    State = filename:join(TestDir, "test.config"),
+    case filelib:is_regular(State) of
         false ->
             " ";
         true ->
-            " -ct_config " ++ Config
+            " -ct_config " ++ State
     end.
 
 get_config_file(TestDir) ->
-    Config = filename:join(TestDir, "app.config"),
-    case filelib:is_regular(Config) of
+    State = filename:join(TestDir, "app.config"),
+    case filelib:is_regular(State) of
         false ->
             " ";
         true ->
-            " -config " ++ Config
+            " -config " ++ State
     end.
 
-get_suites(Config, TestDir) ->
-    case get_suites(Config) of
+get_suites(State, TestDir) ->
+    case get_suites(State) of
         undefined ->
             " -dir " ++ TestDir;
         Suites ->
@@ -338,10 +359,10 @@ get_suites(Config, TestDir) ->
             string:join([" -suite"] ++ Suites2, " ")
     end.
 
-get_suites(Config) ->
-    case rebar_config:get_global(Config, suites, undefined) of
+get_suites(State) ->
+    case rebar_state:get(State, suites, undefined) of
         undefined ->
-            rebar_config:get_global(Config, suite, undefined); 
+            rebar_state:get(State, suite, undefined);
         Suites ->
             Suites
     end.
@@ -358,8 +379,8 @@ find_suite_path(Suite, TestDir) ->
             Path
     end.
 
-get_case(Config) ->
-    case rebar_config:get_global(Config, 'case', undefined) of
+get_case(State) ->
+    case rebar_state:get(State, 'case', undefined) of
         undefined ->
             "";
         Case ->
diff --git a/src/rebar_deps.erl b/src/rebar_deps.erl
index bb7f33f..e050952 100644
--- a/src/rebar_deps.erl
+++ b/src/rebar_deps.erl
@@ -36,7 +36,6 @@
 -export([setup_env/1]).
 
 %% for internal use only
--export([info/2]).
 -export([get_deps_dir/1]).
 -export([get_deps_dir/2]).
 
@@ -54,42 +53,62 @@ init(State) ->
                                                        bare = false,
                                                        deps = ?DEPS,
                                                        example = "rebar deps",
-                                                       short_desc = "",
-                                                       desc = "",
+                                                       short_desc = "Install dependencies",
+                                                       desc = info_help("Install dependencies"),
                                                        opts = []}),
     {ok, State1}.
 
 -spec do(rebar_state:t()) -> {ok, rebar_state:t()}.
-do(Config) ->
-    Deps = rebar_state:get(Config, deps, []),
-    Goals = lists:map(fun({Name, "", _}) ->
-                              Name;
-                         ({Name, ".*", _}) ->
-                              Name;
-                         ({Name, Vsn, _}) ->
-                              {Name, Vsn}
-                      end, Deps),
-
-    {Config1, Deps1} = update_deps(Config, Deps),
-    Config2 = rebar_state:set(Config1, deps, Deps1),
-
-    {ok, rebar_state:set(Config2, goals, Goals)}.
+do(State) ->
+    %% Read in package index and dep graph
+    {Packages, Graph} = get_packages(State),
+    SrcDeps = rebar_state:get(State, src_deps, []),
+    {State1, SrcDeps1} = update_deps(State, SrcDeps),
+
+    case rebar_state:get(State1, deps, []) of
+        [] ->
+            {ok, rebar_state:set(State1, deps, SrcDeps1)};
+        Deps ->
+            Goals = lists:map(fun({Name, Vsn}) ->
+                                      {atom_to_binary(Name, utf8), Vsn};
+                                 (Name) ->
+                                      atom_to_binary(Name, utf8)
+                              end, Deps),
+            {ok, Solved} = rlx_depsolver:solve(Graph, Goals),
+
+            M = lists:map(fun({Name, Vsn}) ->
+                                  {ok, P} = ec_lists:find(fun(App) ->
+                                                                  Name =:= proplists:get_value(<<"name">>, App)
+                                                                      andalso to_binary(rlx_depsolver:format_version(Vsn)) =:= proplists:get_value(<<"vsn">>, App)
+                                                          end, Packages),
+                                  Link = proplists:get_value(<<"link">>, P),
+                                  {Name, Vsn, {Name
+                                              ,to_binary(rlx_depsolver:format_version(Vsn))
+                                              ,Link}}
+                          end, Solved),
+
+            {State2, Deps1} = update_deps(State1, M),
+            State3 = rebar_state:set(State2, deps, Deps1),
+
+            {ok, rebar_state:set(State3, goals, Goals)}
+    end.
 
-update_deps(Config, Deps) ->
-    DepsDir = get_deps_dir(Config),
+update_deps(State, Deps) ->
+    DepsDir = get_deps_dir(State),
 
     %% Find available apps to fulfill dependencies
+    %% Should only have to do this once, not every iteration
     UnbuiltApps = rebar_app_discover:find_unbuilt_apps([DepsDir]),
     FoundApps = rebar_app_discover:find_apps([DepsDir]),
 
     %% Resolve deps and their dependencies
     Deps1 = handle_deps(Deps, UnbuiltApps++FoundApps),
 
-    case download_missing_deps(Config, DepsDir, FoundApps, UnbuiltApps, Deps1) of
-        {Config1, []} ->
-            {Config1, Deps1};
-        {Config1, _} ->
-            update_deps(Config1, Deps1)
+    case download_missing_deps(State, DepsDir, FoundApps, UnbuiltApps, Deps1) of
+        {State1, []} ->
+            {State1, Deps1};
+        {State1, _} ->
+            update_deps(State1, Deps1)
     end.
 
 handle_deps(Deps, Found) ->
@@ -104,36 +123,58 @@ handle_deps(Deps, Found) ->
 
     %% Weed out duplicates
     lists:umerge(fun(A, B) ->
-                         element(1, A) =:= element(1, B)
+                         dep_name(A) =:= dep_name(B)
                  end, lists:usort(Deps), lists:usort(NewDeps1)).
 
-download_missing_deps(Config, DepsDir, Found, Unbuilt, Deps) ->
+dep_name({Name, _, _}) ->
+    Name;
+dep_name({Name, _}) ->
+    Name;
+dep_name(Name) ->
+    Name.
+
+
+to_binary(X) when is_binary(X) ->
+    X;
+to_binary(X) when is_atom(X) ->
+    atom_to_binary(X, utf8);
+to_binary(X) when is_list(X) ->
+    iolist_to_binary(X).
+
+download_missing_deps(State, DepsDir, Found, Unbuilt, Deps) ->
     Missing = lists:filter(fun(X) ->
                                not lists:any(fun(F) ->
-                                                     element(1, X) =:= element(2, F)
+                                                     to_binary(dep_name(X)) =:= to_binary(rebar_app_info:name(F))
                                              end, Found++Unbuilt)
                        end, Deps),
-    ec_plists:foreach(fun(X) ->
-                              TargetDir = get_deps_dir(DepsDir, element(1, X)),
-                              case filelib:is_dir(TargetDir) of
-                                  true ->
-                                      ok;
-                                  false ->
-                                      rebar_fetch:download_source(TargetDir, element(3, X))
-                              end
-                      end, Missing),
-
-    Config1 = lists:foldl(fun(X, ConfigAcc) ->
-                                  TargetDir = get_deps_dir(DepsDir, element(1, X)),
-                                  [AppSrc] = rebar_app_discover:find_unbuilt_apps([TargetDir]),
-                                  rebar_state:add_app(ConfigAcc, AppSrc)
-                          end, Config, Missing),
-
-    {Config1, Missing}.
+    lists:foreach(fun({DepName, _DepVsn, DepSource}) ->
+                          TargetDir = get_deps_dir(DepsDir, DepName),
+                          case filelib:is_dir(TargetDir) of
+                              true ->
+                                  ok;
+                              false ->
+                                  ?INFO("Fetching ~s ~s~n", [element(1, DepSource)
+                                                            ,element(2, DepSource)]),
+                                  rebar_fetch:download_source(TargetDir, DepSource)
+                          end
+                  end, Missing),
+
+    State1 = lists:foldl(fun(X, StateAcc) ->
+                                  TargetDir = get_deps_dir(DepsDir, dep_name(X)),
+                                  case rebar_app_discover:find_unbuilt_apps([TargetDir]) of
+                                      [AppSrc] ->
+                                          {_AppInfo1, StateAcc1} = rebar_prv_app_builder:build(StateAcc, AppSrc),
+                                          StateAcc1;
+                                      [] ->
+                                          StateAcc
+                                  end
+                          end, State, Missing),
+
+    {State1, []}.
 
 %% set REBAR_DEPS_DIR and ERL_LIBS environment variables
-setup_env(Config) ->
-    DepsDir = get_deps_dir(Config),
+setup_env(State) ->
+    DepsDir = get_deps_dir(State),
     %% include rebar's DepsDir in ERL_LIBS
     Separator = case os:type() of
                     {win32, nt} ->
@@ -161,41 +202,54 @@ get_deps_dir(DepsDir, App) ->
 %% Internal functions
 %% ===================================================================
 
-info(help, 'deps') ->
-    info_help("Display dependencies").
+get_packages(State) ->
+    RebarDir = rebar_state:get(State, global_rebar_dir, filename:join(os:getenv("HOME"), ".rebar")),
+    PackagesFile = filename:join(RebarDir, "packages"),
+    case ec_file:exists(PackagesFile) of
+        true ->
+            try
+                {ok, Binary} = file:read_file(PackagesFile),
+                binary_to_term(Binary)
+            catch
+                _:_ ->
+                    ?ERROR("Bad packages index, try to fix with `rebar update`~n", []),
+                    {[], rlx_depsolver:new()}
+            end;
+        false ->
+            {[], rlx_depsolver:new()}
+    end.
 
 info_help(Description) ->
-    ?CONSOLE(
-       "~s.~n"
-       "~n"
-       "Valid rebar.config options:~n"
-       "  ~p~n"
-       "  ~p~n"
-       "Valid command line options:~n"
-       "  deps_dir=\"deps\" (override default or rebar.config deps_dir)~n",
-       [
-        Description,
-        {deps_dir, "deps"},
-        {deps,
-         [app_name,
-          {rebar, "1.0.*"},
-          {rebar, ".*",
-           {git, "git://github.com/rebar/rebar.git"}},
-          {rebar, ".*",
-           {git, "git://github.com/rebar/rebar.git", "Rev"}},
-          {rebar, "1.0.*",
-           {git, "git://github.com/rebar/rebar.git", {branch, "master"}}},
-          {rebar, "1.0.0",
-           {git, "git://github.com/rebar/rebar.git", {tag, "1.0.0"}}},
-          {rebar, "",
-           {git, "git://github.com/rebar/rebar.git", {branch, "master"}},
-           [raw]},
-          {app_name, ".*", {hg, "https://www.example.org/url"}},
-          {app_name, ".*", {rsync, "Url"}},
-          {app_name, ".*", {svn, "https://www.example.org/url"}},
-          {app_name, ".*", {svn, "svn://svn.example.org/url"}},
-          {app_name, ".*", {bzr, "https://www.example.org/url", "Rev"}},
-          {app_name, ".*", {fossil, "https://www.example.org/url"}},
-          {app_name, ".*", {fossil, "https://www.example.org/url", "Vsn"}},
-          {app_name, ".*", {p4, "//depot/subdir/app_dir"}}]}
-       ]).
+    io_lib:format("~s.~n"
+                 "~n"
+                 "Valid rebar.config options:~n"
+                 "  ~p~n"
+                 "  ~p~n"
+                 "Valid command line options:~n"
+                 "  deps_dir=\"deps\" (override default or rebar.config deps_dir)~n",
+                 [
+                 Description,
+                 {deps_dir, "deps"},
+                 {deps,
+                  [app_name,
+                   {rebar, "1.0.*"},
+                   {rebar, ".*",
+                    {git, "git://github.com/rebar/rebar.git"}},
+                   {rebar, ".*",
+                    {git, "git://github.com/rebar/rebar.git", "Rev"}},
+                   {rebar, "1.0.*",
+                    {git, "git://github.com/rebar/rebar.git", {branch, "master"}}},
+                   {rebar, "1.0.0",
+                    {git, "git://github.com/rebar/rebar.git", {tag, "1.0.0"}}},
+                   {rebar, "",
+                    {git, "git://github.com/rebar/rebar.git", {branch, "master"}},
+                    [raw]},
+                   {app_name, ".*", {hg, "https://www.example.org/url"}},
+                   {app_name, ".*", {rsync, "Url"}},
+                   {app_name, ".*", {svn, "https://www.example.org/url"}},
+                   {app_name, ".*", {svn, "svn://svn.example.org/url"}},
+                   {app_name, ".*", {bzr, "https://www.example.org/url", "Rev"}},
+                   {app_name, ".*", {fossil, "https://www.example.org/url"}},
+                   {app_name, ".*", {fossil, "https://www.example.org/url", "Vsn"}},
+                   {app_name, ".*", {p4, "//depot/subdir/app_dir"}}]}
+                 ]).
diff --git a/src/rebar_fetch.erl b/src/rebar_fetch.erl
index 6ed0f3f..024e032 100644
--- a/src/rebar_fetch.erl
+++ b/src/rebar_fetch.erl
@@ -114,7 +114,14 @@ download_source(AppDir, {fossil, Url, Version}) ->
     rebar_utils:sh(?FMT("fossil clone ~s ~s", [Url, Repository]),
                    [{cd, AppDir}]),
     rebar_utils:sh(?FMT("fossil open ~s ~s --nested", [Repository, Version]),
-                   []).
+                   []);
+download_source(AppDir, {AppName, AppVersion, Url}) when is_binary(AppName)
+                                                       , is_binary(AppVersion) ->
+    TmpDir = ec_file:insecure_mkdtemp(),
+    TmpFile = binary_to_list(filename:join(TmpDir, <<AppName/binary, "-", AppVersion/binary>>)),
+    {ok, saved_to_file} = httpc:request(get, {binary_to_list(Url), []}, [], [{stream, TmpFile}]),
+    ok = erl_tar:extract(TmpFile, [{cwd, filename:dirname(AppDir)}, compressed]),
+    ok.
 
 update_source1(AppDir, Args) when element(1, Args) =:= p4 ->
     download_source(AppDir, Args);
diff --git a/src/rebar_log.erl b/src/rebar_log.erl
index 81a2d6c..787e5bc 100644
--- a/src/rebar_log.erl
+++ b/src/rebar_log.erl
@@ -62,8 +62,8 @@ log(Level, Str, Args) ->
 error_level() -> ?ERROR_LEVEL.
 default_level() -> ?INFO_LEVEL.
 
-is_verbose(Config) ->
-    rebar_config:get_xconf(Config, is_verbose, false).
+is_verbose(State) ->
+    rebar_state:get(State, is_verbose, false).
 
 %% ===================================================================
 %% Internal functions
diff --git a/src/rebar_prv_app_builder.erl b/src/rebar_prv_app_builder.erl
index e608eb1..90de4fb 100644
--- a/src/rebar_prv_app_builder.erl
+++ b/src/rebar_prv_app_builder.erl
@@ -3,7 +3,8 @@
 -behaviour(rebar_provider).
 
 -export([init/1,
-         do/1]).
+         do/1,
+         build/2]).
 
 -include("rebar.hrl").
 
@@ -47,17 +48,10 @@ do(Config) ->
 
 build(Config, AppInfo) ->
     {ok, AppInfo1} = rebar_otp_app:compile(Config, AppInfo),
-    Config1 = rebar_state:add_app(Config, AppInfo1),
+    Config1 = rebar_state:apps_to_build(Config, AppInfo1),
     rebar_erlc_compiler:compile(Config, rebar_app_info:dir(AppInfo1)),
     {AppInfo1, Config1}.
 
 %% ===================================================================
 %% Internal functions
 %% ===================================================================
-
-get_deps_dir(Config) ->
-    BaseDir = rebar_utils:base_dir(Config),
-    get_deps_dir(BaseDir, deps).
-
-get_deps_dir(DepsDir, App) ->
-    filename:join(DepsDir, atom_to_list(App)).
diff --git a/src/rebar_prv_update.erl b/src/rebar_prv_update.erl
index f48b507..78c7c34 100644
--- a/src/rebar_prv_update.erl
+++ b/src/rebar_prv_update.erl
@@ -30,22 +30,42 @@ init(State) ->
     {ok, State1}.
 
 -spec do(rebar_state:t()) -> {ok, rebar_state:t()} | relx:error().
-do(Config) ->
-    [Name] = rebar_state:command_args(Config),
-    ?INFO("Updating ~s~n", [Name]),
+do(State) ->
+    case rebar_state:command_args(State) of
+        [Name] ->
+            ?INFO("Updating ~s~n", [Name]),
 
-    DepsDir = rebar_deps:get_deps_dir(Config),
-    Deps = rebar_state:get_local(Config, deps, []),
-    {_, _, Source} = lists:keyfind(list_to_atom(Name), 1, Deps),
-    TargetDir = rebar_deps:get_deps_dir(DepsDir, Name),
-    rebar_fetch:update_source1(TargetDir, Source),
+            DepsDir = rebar_deps:get_deps_dir(State),
+            Deps = rebar_state:get_local(State, deps, []),
+            {_, _, Source} = lists:keyfind(list_to_atom(Name), 1, Deps),
+            TargetDir = rebar_deps:get_deps_dir(DepsDir, Name),
+            rebar_fetch:update_source1(TargetDir, Source),
 
-    [App] = rebar_app_discover:find_apps([TargetDir]),
+            [App] = rebar_app_discover:find_apps([TargetDir]),
 
-    {ok, AppInfo1} = rebar_otp_app:compile(Config, App),
-    Config1 = rebar_state:replace_app(Config, rebar_app_info:name(AppInfo1), AppInfo1),
-    rebar_erlc_compiler:compile(Config, rebar_app_info:dir(AppInfo1)),
+            {ok, AppInfo1} = rebar_otp_app:compile(State, App),
+            State1 = rebar_state:replace_app(State, rebar_app_info:name(AppInfo1), AppInfo1),
+            rebar_erlc_compiler:compile(State, rebar_app_info:dir(AppInfo1)),
 
-    %update_lock_file(Config, AppInfo1, Source),
+                                                %update_lock_file(State, AppInfo1, Source),
 
-    {ok, Config}.
+            {ok, State};
+        [] ->
+            ?INFO("Updating package index...", []),
+            Url = rebar_state:get(State, rebar_packages_url, ""),
+            ec_file:mkdir_p(filename:join([os:getenv("HOME"), ".rebar"])),
+            PackagesFile = filename:join([os:getenv("HOME"), ".rebar", "packages"]),
+            {ok, RequestId} = httpc:request(get, {Url, []}, [], [{stream, PackagesFile}, {sync, false}]),
+            wait(RequestId, State)
+    end.
+
+wait(RequestId, State) ->
+    receive
+        {http, {RequestId, saved_to_file}} ->
+            io:format("~n"),
+            {ok, State}
+    after
+        500 ->
+            io:format("."),
+            wait(RequestId, State)
+    end.
diff --git a/src/rebar_qc.erl b/src/rebar_qc.erl
deleted file mode 100644
index 2c565f1..0000000
--- a/src/rebar_qc.erl
+++ /dev/null
@@ -1,216 +0,0 @@
-%% -*- erlang-indent-level: 4;indent-tabs-mode: nil -*-
-%% ex: ts=4 sw=4 et
-%% -------------------------------------------------------------------
-%%
-%% rebar: Erlang Build Tools
-%%
-%% Copyright (c) 2011-2014 Tuncer Ayaz
-%%
-%% Permission is hereby granted, free of charge, to any person obtaining a copy
-%% of this software and associated documentation files (the "Software"), to deal
-%% in the Software without restriction, including without limitation the rights
-%% to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
-%% copies of the Software, and to permit persons to whom the Software is
-%% furnished to do so, subject to the following conditions:
-%%
-%% The above copyright notice and this permission notice shall be included in
-%% all copies or substantial portions of the Software.
-%%
-%% THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
-%% IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
-%% FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
-%% AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
-%% LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
-%% OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
-%% THE SOFTWARE.
-%% -------------------------------------------------------------------
--module(rebar_qc).
-
--export([qc/2, triq/2, eqc/2, clean/2]).
-
-%% for internal use only
--export([info/2]).
-
--include("rebar.hrl").
-
--define(QC_DIR, ".qc").
-
-%% ===================================================================
-%% Public API
-%% ===================================================================
-
-qc(Config, _AppFile) ->
-    ?CONSOLE("NOTICE: Using experimental 'qc' command~n", []),
-    run_qc(Config, qc_opts(Config)).
-
-triq(Config, _AppFile) ->
-    ?CONSOLE("NOTICE: Using experimental 'triq' command~n", []),
-    ok = load_qc_mod(triq),
-    run_qc(Config, qc_opts(Config), triq).
-
-eqc(Config, _AppFile) ->
-    ?CONSOLE("NOTICE: Using experimental 'eqc' command~n", []),
-    ok = load_qc_mod(eqc),
-    run_qc(Config, qc_opts(Config), eqc).
-
-clean(_Config, _File) ->
-    rebar_file_utils:rm_rf(?QC_DIR).
-
-%% ===================================================================
-%% Internal functions
-%% ===================================================================
-
-info(help, qc) ->
-    ?CONSOLE(
-       "Test QuickCheck properties.~n"
-       "~n"
-       "Valid rebar.config options:~n"
-       "  {qc_opts, [{qc_mod, module()}, Options]}~n"
-       "  ~p~n"
-       "  ~p~n"
-       "  ~p~n"
-       "  ~p~n"
-       "  ~p~n"
-       "Valid command line options:~n"
-       "  compile_only=true (Compile but do not test properties)",
-       [
-        {qc_compile_opts, []},
-        {qc_first_files, []},
-        {cover_enabled, false},
-        {cover_print_enabled, false},
-        {cover_export_enabled, false}
-       ]);
-info(help, clean) ->
-    Description = ?FMT("Delete QuickCheck test dir (~s)", [?QC_DIR]),
-    ?CONSOLE("~s.~n", [Description]).
-
--define(TRIQ_MOD, triq).
--define(EQC_MOD, eqc).
-
-qc_opts(Config) ->
-    rebar_config:get(Config, qc_opts, []).
-
-run_qc(Config, QCOpts) ->
-    run_qc(Config, QCOpts, select_qc_mod(QCOpts)).
-
-run_qc(Config, RawQCOpts, QC) ->
-    ?DEBUG("Selected QC module: ~p~n", [QC]),
-    QCOpts = lists:filter(fun({qc_mod, _}) -> false;
-                             (_) -> true
-                          end, RawQCOpts),
-    run(Config, QC, QCOpts).
-
-select_qc_mod(QCOpts) ->
-    case proplists:get_value(qc_mod, QCOpts) of
-        undefined ->
-            detect_qc_mod();
-        QC ->
-            case code:ensure_loaded(QC) of
-                {module, QC} ->
-                    QC;
-                {error, nofile} ->
-                    ?ABORT("Configured QC library '~p' not available~n", [QC])
-            end
-    end.
-
-detect_qc_mod() ->
-    case code:ensure_loaded(?TRIQ_MOD) of
-        {module, ?TRIQ_MOD} ->
-            ?TRIQ_MOD;
-        {error, nofile} ->
-            case code:ensure_loaded(?EQC_MOD) of
-                {module, ?EQC_MOD} ->
-                    ?EQC_MOD;
-                {error, nofile} ->
-                    ?ABORT("No QC library available~n", [])
-            end
-    end.
-
-load_qc_mod(Mod) ->
-    case code:ensure_loaded(Mod) of
-        {module, Mod} ->
-            ok;
-        {error, nofile} ->
-            ?ABORT("Failed to load QC lib '~p'~n", [Mod])
-    end.
-
-ensure_dirs() ->
-    ok = filelib:ensure_dir(filename:join(qc_dir(), "dummy")),
-    ok = filelib:ensure_dir(filename:join(rebar_utils:ebin_dir(), "dummy")).
-
-setup_codepath() ->
-    CodePath = code:get_path(),
-    true = code:add_patha(qc_dir()),
-    true = code:add_pathz(rebar_utils:ebin_dir()),
-    CodePath.
-
-qc_dir() ->
-    filename:join(rebar_utils:get_cwd(), ?QC_DIR).
-
-run(Config, QC, QCOpts) ->
-    ?DEBUG("qc_opts: ~p~n", [QCOpts]),
-
-    ok = ensure_dirs(),
-    CodePath = setup_codepath(),
-
-    CompileOnly = rebar_config:get_global(Config, compile_only, false),
-    %% Compile erlang code to ?QC_DIR, using a tweaked config
-    %% with appropriate defines, and include all the test modules
-    %% as well.
-    {ok, SrcErls} = rebar_erlc_compiler:test_compile(Config, "qc", ?QC_DIR),
-
-    case CompileOnly of
-        "true" ->
-            true = code:set_path(CodePath),
-            ?CONSOLE("Compiled modules for qc~n", []);
-        false ->
-            run1(QC, QCOpts, Config, CodePath, SrcErls)
-    end.
-
-run1(QC, QCOpts, Config, CodePath, SrcErls) ->
-
-    AllBeamFiles = rebar_utils:beams(?QC_DIR),
-    AllModules = [rebar_utils:beam_to_mod(?QC_DIR, N)
-                  || N <- AllBeamFiles],
-    PropMods = find_prop_mods(),
-    FilteredModules = AllModules -- PropMods,
-
-    SrcModules = [rebar_utils:erl_to_mod(M) || M <- SrcErls],
-
-    {ok, CoverLog} = rebar_cover_utils:init(Config, AllBeamFiles, qc_dir()),
-
-    TestModule = fun(M) -> qc_module(QC, QCOpts, M) end,
-    QCResult = lists:flatmap(TestModule, PropMods),
-
-    rebar_cover_utils:perform_cover(Config, FilteredModules, SrcModules,
-                                    qc_dir()),
-    rebar_cover_utils:close(CoverLog),
-    ok = rebar_cover_utils:exit(),
-
-    true = code:set_path(CodePath),
-
-    case QCResult of
-        [] ->
-            ok;
-        Errors ->
-            ?ABORT("One or more QC properties didn't hold true:~n~p~n",
-                   [Errors])
-    end.
-
-qc_module(QC=triq, _QCOpts, M) ->
-    case QC:module(M) of
-        true ->
-            [];
-        Failed ->
-            [Failed]
-    end;
-qc_module(QC=eqc, [], M) -> QC:module(M);
-qc_module(QC=eqc, QCOpts, M) -> QC:module(QCOpts, M).
-
-find_prop_mods() ->
-    Beams = rebar_utils:find_files(?QC_DIR, "^[^._].*\\.beam\$"),
-    [M || M <- [rebar_utils:erl_to_mod(Beam) || Beam <- Beams], has_prop(M)].
-
-has_prop(Mod) ->
-    lists:any(fun({F,_A}) -> lists:prefix("prop_", atom_to_list(F)) end,
-              Mod:module_info(exports)).
diff --git a/src/rebar_state.erl b/src/rebar_state.erl
index 62448ed..1e06ac6 100644
--- a/src/rebar_state.erl
+++ b/src/rebar_state.erl
@@ -7,8 +7,7 @@
          set_skip_dir/2, is_skip_dir/2, reset_skip_dirs/1,
          create_logic_providers/2,
 
-         add_app/2, apps_to_build/1, apps_to_build/2,
-         deps_to_build/1, deps_to_build/2,
+         apps_to_build/1, apps_to_build/2,
 
          providers/1, providers/2, add_provider/2]).
 
@@ -30,10 +29,10 @@
                   envs = new_env() :: rebar_dict(),
                   command_args = [] :: list(),
 
+                  apps = dict:new() :: rebar_dict(),
                   goals = [],
                   providers = [],
                   apps_to_build = [],
-                  deps_to_build = [],
                   skip_dirs = new_skip_dirs() :: rebar_dict() }).
 
 -export_type([t/0]).
@@ -75,9 +74,6 @@ get(State, Key) ->
 get(State, Key, Default) ->
     proplists:get_value(Key, State#state_t.opts, Default).
 
-get_local(State, Key, Default) ->
-    proplists:get_value(Key, State#state_t.local_opts, Default).
-
 set(State, Key, Value) ->
     Opts = proplists:delete(Key, State#state_t.opts),
     State#state_t { opts = [{Key, Value} | Opts] }.
@@ -105,40 +101,20 @@ command_args(#state_t{command_args=CmdArgs}) ->
 command_args(State, CmdArgs) ->
     State#state_t{command_args=CmdArgs}.
 
-get_app(#state_t{apps_to_build=Apps}, Name) ->
-    lists:keyfind(Name, 2, Apps).
-
 apps_to_build(#state_t{apps_to_build=Apps}) ->
     Apps.
 
-apps_to_build(State, Apps) ->
-    State#state_t{apps_to_build=Apps}.
-
-deps_to_build(#state_t{deps_to_build=Deps}) ->
-    Deps.
-
-deps_to_build(State, Deps) ->
-    State#state_t{deps_to_build=Deps}.
-
-add_app(State=#state_t{apps_to_build=Apps}, App) ->
+apps_to_build(State=#state_t{apps_to_build=Apps}, Apps) when is_list(Apps) ->
+    State#state_t{apps_to_build=Apps};
+apps_to_build(State=#state_t{apps_to_build=Apps}, App) ->
     State#state_t{apps_to_build=[App | Apps]}.
 
-replace_app(State=#state_t{apps_to_build=Apps}, Name, App) ->
-    Apps1 = lists:keydelete(Name, 2, Apps),
-    State#state_t{apps_to_build=[App | Apps1]}.
-
 providers(#state_t{providers=Providers}) ->
     Providers.
 
 providers(State, NewProviders) ->
     State#state_t{providers=NewProviders}.
 
-goals(#state_t{goals=Goals}) ->
-    Goals.
-
-goals(State, Goals) ->
-    State#state_t{goals=Goals}.
-
 add_provider(State=#state_t{providers=Providers}, Provider) ->
     State#state_t{providers=[Provider | Providers]}.
 
diff --git a/src/rebar_subdirs.erl b/src/rebar_subdirs.erl
deleted file mode 100644
index f444a59..0000000
--- a/src/rebar_subdirs.erl
+++ /dev/null
@@ -1,84 +0,0 @@
-%% -*- erlang-indent-level: 4;indent-tabs-mode: nil -*-
-%% ex: ts=4 sw=4 et
-%% -------------------------------------------------------------------
-%%
-%% rebar: Erlang Build Tools
-%%
-%% Copyright (c) 2009 Dave Smith (dizzyd@dizzyd.com)
-%%
-%% Permission is hereby granted, free of charge, to any person obtaining a copy
-%% of this software and associated documentation files (the "Software"), to deal
-%% in the Software without restriction, including without limitation the rights
-%% to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
-%% copies of the Software, and to permit persons to whom the Software is
-%% furnished to do so, subject to the following conditions:
-%%
-%% The above copyright notice and this permission notice shall be included in
-%% all copies or substantial portions of the Software.
-%%
-%% THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
-%% IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
-%% FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
-%% AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
-%% LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
-%% OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
-%% THE SOFTWARE.
-%% -------------------------------------------------------------------
--module(rebar_subdirs).
-
--include("rebar.hrl").
--include_lib("kernel/include/file.hrl").
-
--export([preprocess/2]).
-
-%% ===================================================================
-%% Public API
-%% ===================================================================
-
-preprocess(Config, _) ->
-    %% Get the list of subdirs specified in the config (if any).
-    Cwd = rebar_utils:get_cwd(),
-    ListSubdirs = rebar_config:get_local(Config, sub_dirs, []),
-    Subdirs0 = lists:flatmap(fun filelib:wildcard/1, ListSubdirs),
-    case {rebar_config:is_skip_dir(Config, Cwd), Subdirs0} of
-        {true, []} ->
-            {ok, []};
-        {true, _} ->
-            ?WARN("Ignoring sub_dirs for ~s~n", [Cwd]),
-            {ok, []};
-        {false, _} ->
-            Check = check_loop(Cwd),
-            ok = lists:foreach(Check, Subdirs0),
-            Subdirs = [filename:join(Cwd, Dir) || Dir <- Subdirs0],
-            {ok, Subdirs}
-    end.
-
-%% ===================================================================
-%% Internal functions
-%% ===================================================================
-
-check_loop(Cwd) ->
-    RebarConfig = filename:join(Cwd, "rebar.config"),
-    fun(Dir0) ->
-            IsSymlink = case file:read_link_info(Dir0) of
-                            {ok, #file_info{type=symlink}} ->
-                                {true, resolve_symlink(Dir0)};
-                            _ ->
-                                {false, Dir0}
-                        end,
-            case IsSymlink of
-                {false, Dir="."} ->
-                    ?ERROR("infinite loop detected:~nsub_dirs"
-                           " entry ~p in ~s~n", [Dir, RebarConfig]);
-                {true, Cwd} ->
-                    ?ERROR("infinite loop detected:~nsub_dirs"
-                           " entry ~p in ~s is a symlink to \".\"~n",
-                           [Dir0, RebarConfig]);
-                _ ->
-                    ok
-            end
-    end.
-
-resolve_symlink(Dir0) ->
-    {ok, Dir} = file:read_link(Dir0),
-    Dir.
diff --git a/src/rebar_utils.erl b/src/rebar_utils.erl
index 6b12e99..18e76fc 100644
--- a/src/rebar_utils.erl
+++ b/src/rebar_utils.erl
@@ -63,13 +63,16 @@
          ebin_dir/0,
          processing_base_dir/1,
          processing_base_dir/2,
-         patch_env/2]).
+         patch_env/2,
+         indent/1]).
 
 %% for internal use only
 -export([otp_release/0]).
 
 -include("rebar.hrl").
 
+-define(ONE_LEVEL_INDENT, "     ").
+
 %% ====================================================================
 %% Public API
 %% ====================================================================
@@ -598,3 +601,8 @@ filter_defines([{platform_define, ArchRegex, Key, Value} | Rest], Acc) ->
     end;
 filter_defines([Opt | Rest], Acc) ->
     filter_defines(Rest, [Opt | Acc]).
+
+%% @doc ident to the level specified
+-spec indent(non_neg_integer()) -> iolist().
+indent(Amount) when erlang:is_integer(Amount) ->
+    [?ONE_LEVEL_INDENT || _ <- lists:seq(1, Amount)].
diff --git a/src/rebar_xref.erl b/src/rebar_xref.erl
deleted file mode 100644
index 16e8cc4..0000000
--- a/src/rebar_xref.erl
+++ /dev/null
@@ -1,290 +0,0 @@
-%% -*- erlang-indent-level: 4;indent-tabs-mode: nil -*-
-%% ex: ts=4 sw=4 et
-%% -------------------------------------------------------------------
-%%
-%% rebar: Erlang Build Tools
-%%
-%% Copyright (c) 2009 Dave Smith (dizzyd@dizzyd.com)
-%%
-%% Permission is hereby granted, free of charge, to any person obtaining a copy
-%% of this software and associated documentation files (the "Software"), to deal
-%% in the Software without restriction, including without limitation the rights
-%% to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
-%% copies of the Software, and to permit persons to whom the Software is
-%% furnished to do so, subject to the following conditions:
-%%
-%% The above copyright notice and this permission notice shall be included in
-%% all copies or substantial portions of the Software.
-%%
-%% THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
-%% IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
-%% FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
-%% AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
-%% LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
-%% OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
-%% THE SOFTWARE.
-%%
-%% -------------------------------------------------------------------
-
-%% -------------------------------------------------------------------
-%% This module borrows heavily from http://github.com/etnt/exrefcheck project as
-%% written by Torbjorn Tornkvist <tobbe@kreditor.se>, Daniel Luna
-%% <daniel@lunas.se> and others.
-%% -------------------------------------------------------------------
--module(rebar_xref).
-
--include("rebar.hrl").
-
--export([xref/2]).
-
-%% for internal use only
--export([info/2]).
-
-%% ===================================================================
-%% Public API
-%% ===================================================================
-
-xref(Config, _) ->
-    %% Spin up xref
-    {ok, _} = xref:start(xref),
-    ok = xref:set_library_path(xref, code_path(Config)),
-
-    xref:set_default(xref, [{warnings,
-                             rebar_config:get(Config, xref_warnings, false)},
-                            {verbose, rebar_log:is_verbose(Config)}]),
-
-    {ok, _} = xref:add_directory(xref, "ebin"),
-
-    %% Save the code path prior to doing anything
-    OrigPath = code:get_path(),
-    true = code:add_path(rebar_utils:ebin_dir()),
-
-    %% Get list of xref checks we want to run
-    ConfXrefChecks = rebar_config:get(Config, xref_checks,
-                                      [exports_not_used,
-                                       undefined_function_calls]),
-
-    SupportedXrefs = [undefined_function_calls, undefined_functions,
-                      locals_not_used, exports_not_used,
-                      deprecated_function_calls, deprecated_functions],
-
-    XrefChecks = sets:to_list(sets:intersection(
-                                sets:from_list(SupportedXrefs),
-                                sets:from_list(ConfXrefChecks))),
-
-    %% Run xref checks
-    XrefNoWarn = xref_checks(XrefChecks),
-
-    %% Run custom queries
-    QueryChecks = rebar_config:get(Config, xref_queries, []),
-    QueryNoWarn = lists:all(fun check_query/1, QueryChecks),
-
-    %% Restore the original code path
-    true = code:set_path(OrigPath),
-
-    %% Stop xref
-    stopped = xref:stop(xref),
-
-    case lists:member(false, [XrefNoWarn, QueryNoWarn]) of
-        true ->
-            ?FAIL;
-        false ->
-            ok
-    end.
-
-%% ===================================================================
-%% Internal functions
-%% ===================================================================
-
-info(help, xref) ->
-    ?CONSOLE(
-       "Run cross reference analysis.~n"
-       "~n"
-       "Valid rebar.config options:~n"
-       "  ~p~n"
-       "  ~p~n"
-       "  ~p~n"
-       "  ~p~n",
-       [
-        {xref_warnings, false},
-        {xref_extra_paths,[]},
-        {xref_checks, [undefined_function_calls, undefined_functions,
-                       locals_not_used, exports_not_used,
-                       deprecated_function_calls, deprecated_functions]},
-        {xref_queries,
-         [{"(xc - uc) || (xu - x - b"
-           " - (\"mod\":\".*foo\"/\"4\"))",[]}]}
-       ]).
-
-xref_checks(XrefChecks) ->
-    XrefWarnCount = lists:foldl(fun run_xref_check/2, 0, XrefChecks),
-    XrefWarnCount =:= 0.
-
-run_xref_check(XrefCheck, Acc) ->
-    {ok, Results} = xref:analyze(xref, XrefCheck),
-    FilteredResults =filter_xref_results(XrefCheck, Results),
-    lists:foreach(fun(Res) ->
-                          display_xref_result(XrefCheck, Res)
-                  end,
-                  FilteredResults),
-    Acc + length(FilteredResults).
-
-check_query({Query, Value}) ->
-    {ok, Answer} = xref:q(xref, Query),
-    case Answer =:= Value of
-        false ->
-            ?CONSOLE("Query ~s~n answer ~p~n did not match ~p~n",
-                     [Query, Answer, Value]),
-            false;
-        _     ->
-            true
-    end.
-
-code_path(Config) ->
-    %% Slight hack to ensure that sub_dirs get properly included
-    %% in code path for xref -- otherwise one gets a lot of undefined
-    %% functions, even though those functions are present as part
-    %% of compilation. H/t to @dluna. Long term we should tie more
-    %% properly into the overall compile code path if possible.
-    BaseDir = rebar_utils:base_dir(Config),
-    [P || P <- code:get_path() ++
-              rebar_config:get(Config, xref_extra_paths, []) ++
-              [filename:join(BaseDir, filename:join(SubDir, "ebin"))
-               || SubDir <- rebar_config:get(Config, sub_dirs, [])],
-          filelib:is_dir(P)].
-
-%%
-%% Ignore behaviour functions, and explicitly marked functions
-%%
-%% Functions can be ignored by using
-%% -ignore_xref([{F, A}, {M, F, A}...]).
-
-get_xref_ignorelist(Mod, XrefCheck) ->
-    %% Get ignore_xref attribute and combine them in one list
-    Attributes =
-        try
-            Mod:module_info(attributes)
-        catch
-            _Class:_Error -> []
-        end,
-
-    IgnoreXref = keyall(ignore_xref, Attributes),
-
-    BehaviourCallbacks = get_behaviour_callbacks(XrefCheck, Attributes),
-
-    %% And create a flat {M,F,A} list
-    lists:foldl(
-      fun({F, A}, Acc) -> [{Mod,F,A} | Acc];
-         ({M, F, A}, Acc) -> [{M,F,A} | Acc]
-      end, [], lists:flatten([IgnoreXref, BehaviourCallbacks])).
-
-keyall(Key, List) ->
-    lists:flatmap(fun({K, L}) when Key =:= K -> L; (_) -> [] end, List).
-
-get_behaviour_callbacks(exports_not_used, Attributes) ->
-    [B:behaviour_info(callbacks) || B <- keyall(behaviour, Attributes)];
-get_behaviour_callbacks(_XrefCheck, _Attributes) ->
-    [].
-
-parse_xref_result({_, MFAt}) -> MFAt;
-parse_xref_result(MFAt) -> MFAt.
-
-filter_xref_results(XrefCheck, XrefResults) ->
-    SearchModules = lists:usort(
-                      lists:map(
-                        fun({Mt,_Ft,_At}) -> Mt;
-                           ({{Ms,_Fs,_As},{_Mt,_Ft,_At}}) -> Ms;
-                           (_) -> undefined
-                        end, XrefResults)),
-
-    Ignores = lists:flatmap(fun(Module) ->
-                                    get_xref_ignorelist(Module, XrefCheck)
-                            end, SearchModules),
-
-    [Result || Result <- XrefResults,
-               not lists:member(parse_xref_result(Result), Ignores)].
-
-display_xref_result(Type, XrefResult) ->
-    { Source, SMFA, TMFA } = case XrefResult of
-                                 {MFASource, MFATarget} ->
-                                     {format_mfa_source(MFASource),
-                                      format_mfa(MFASource),
-                                      format_mfa(MFATarget)};
-                                 MFATarget ->
-                                     {format_mfa_source(MFATarget),
-                                      format_mfa(MFATarget),
-                                      undefined}
-                             end,
-    case Type of
-        undefined_function_calls ->
-            ?CONSOLE("~sWarning: ~s calls undefined function ~s (Xref)\n",
-                     [Source, SMFA, TMFA]);
-        undefined_functions ->
-            ?CONSOLE("~sWarning: ~s is undefined function (Xref)\n",
-                     [Source, SMFA]);
-        locals_not_used ->
-            ?CONSOLE("~sWarning: ~s is unused local function (Xref)\n",
-                     [Source, SMFA]);
-        exports_not_used ->
-            ?CONSOLE("~sWarning: ~s is unused export (Xref)\n",
-                     [Source, SMFA]);
-        deprecated_function_calls ->
-            ?CONSOLE("~sWarning: ~s calls deprecated function ~s (Xref)\n",
-                     [Source, SMFA, TMFA]);
-        deprecated_functions ->
-            ?CONSOLE("~sWarning: ~s is deprecated function (Xref)\n",
-                     [Source, SMFA]);
-        Other ->
-            ?CONSOLE("~sWarning: ~s - ~s xref check: ~s (Xref)\n",
-                     [Source, SMFA, TMFA, Other])
-    end.
-
-format_mfa({M, F, A}) ->
-    ?FMT("~s:~s/~w", [M, F, A]).
-
-format_mfa_source(MFA) ->
-    case find_mfa_source(MFA) of
-        {module_not_found, function_not_found} -> "";
-        {Source, function_not_found} -> ?FMT("~s: ", [Source]);
-        {Source, Line} -> ?FMT("~s:~w: ", [Source, Line])
-    end.
-
-%%
-%% Extract an element from a tuple, or undefined if N > tuple size
-%%
-safe_element(N, Tuple) ->
-    case catch(element(N, Tuple)) of
-        {'EXIT', {badarg, _}} ->
-            undefined;
-        Value ->
-            Value
-    end.
-
-%%
-%% Given a MFA, find the file and LOC where it's defined. Note that
-%% xref doesn't work if there is no abstract_code, so we can avoid
-%% being too paranoid here.
-%%
-find_mfa_source({M, F, A}) ->
-    case code:get_object_code(M) of
-        error -> {module_not_found, function_not_found};
-        {M, Bin, _} -> find_function_source(M,F,A,Bin)
-    end.
-
-find_function_source(M, F, A, Bin) ->
-    AbstractCode = beam_lib:chunks(Bin, [abstract_code]),
-    {ok, {M, [{abstract_code, {raw_abstract_v1, Code}}]}} = AbstractCode,
-    %% Extract the original source filename from the abstract code
-    [{attribute, 1, file, {Source, _}} | _] = Code,
-    %% Extract the line number for a given function def
-    Fn = [E || E <- Code,
-               safe_element(1, E) == function,
-               safe_element(3, E) == F,
-               safe_element(4, E) == A],
-    case Fn of
-        [{function, Line, F, _, _}] -> {Source, Line};
-        %% do not crash if functions are exported, even though they
-        %% are not in the source.
-        %% parameterized modules add new/1 and instance/1 for example.
-        [] -> {Source, function_not_found}
-    end.