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%% -*- erlang-indent-level: 4; indent-tabs-mode: nil; fill-column: 80 -*-
%%% Copyright 2012 Erlware, LLC. All Rights Reserved.
%%%
%%% This file is provided to you under the Apache License,
%%% Version 2.0 (the "License"); you may not use this file
%%% except in compliance with the License. You may obtain
%%% a copy of the License at
%%%
%%% http://www.apache.org/licenses/LICENSE-2.0
%%%
%%% Unless required by applicable law or agreed to in writing,
%%% software distributed under the License is distributed on an
%%% "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
%%% KIND, either express or implied. See the License for the
%%% specific language governing permissions and limitations
%%% under the License.
%%%---------------------------------------------------------------------------
%%% @author Eric Merritt <[email protected]>
%%% @copyright (C) 2012 Erlware, LLC.
%%%
%%% @doc This provider uses the lib_dir setting of the state. It searches the
%%% Lib Dirs looking for all OTP Applications that are available. When it finds
%%% those OTP Applications it loads the information about them and adds them to
%%% the state of available apps. This implements the rcl_provider behaviour.
-module(rcl_prv_discover).
-behaviour(rcl_provider).
-export([init/1,
do/1,
format_error/1]).
-include_lib("relcool/include/relcool.hrl").
%%============================================================================
%% API
%%============================================================================
-spec init(rcl_state:t()) -> {ok, rcl_state:t()}.
init(State) ->
{ok, State}.
%% @doc recursively dig down into the library directories specified in the state
%% looking for OTP Applications
-spec do(rcl_state:t()) -> {ok, rcl_state:t()} | relcool:error().
do(State) ->
LibDirs = get_lib_dirs(State),
case rcl_app_discovery:do(State, LibDirs) of
{ok, AppMeta} ->
{ok, rcl_state:available_apps(State, AppMeta)};
Error ->
Error
end.
%% @doc this is here to comply with the signature. However, we do not actually
%% produce any errors and so simply return an empty string.
-spec format_error(any()) -> iolist().
format_error(_) ->
"".
%%%===================================================================
%%% Internal Functions
%%%===================================================================
get_lib_dirs(State) ->
LibDirs0 = rcl_state:lib_dirs(State),
case rcl_state:get(State, disable_default_libs, false) of
true ->
LibDirs0;
false ->
add_current_dir(State, LibDirs0)
end.
-spec add_current_dir(rcl_state:t(), [file:name()]) -> [file:name()].
add_current_dir(State, LibDirs) ->
%% Check to see if there is a rebar.config. If so then look for a deps
%% dir. If both are there then we add that to the lib dirs.
Root = rcl_state:root_dir(State),
add_system_lib_dir(State, [filename:absname(Root) | LibDirs]).
-spec add_system_lib_dir(rcl_state:t(), [file:name()]) -> [file:name()].
add_system_lib_dir(State, LibDirs) ->
ExcludeSystem = rcl_state:get(State, discover_exclude_system, false),
case ExcludeSystem of
true ->
LibDirs;
false ->
SystemLibDir0 = code:lib_dir(),
case filelib:is_dir(SystemLibDir0) of
true ->
[SystemLibDir0 | LibDirs];
false ->
LibDirs
end
end.
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